     1                                  ; ****************************************************************************
     2                                  ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.3
     3                                  ; ----------------------------------------------------------------------------
     4                                  ; Last Update: 24/01/2021
     5                                  ; ----------------------------------------------------------------------------
     6                                  ; Beginning: 04/01/2016
     7                                  ; ----------------------------------------------------------------------------
     8                                  ; Assembler: NASM version 2.15 (trdos386.s)
     9                                  ; ----------------------------------------------------------------------------
    10                                  ; Turkish Rational DOS
    11                                  ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                                  ;
    13                                  ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                                  ; unix386.s (03/01/2016)
    15                                  ;
    16                                  ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    17                                  ; TRDOS2.ASM (09/11/2011)
    18                                  ; 
    19                                  ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    20                                  ; ****************************************************************************
    21                                  ; nasm trdos386.s -l trdos386.txt -o TRDOS386.SYS
    22                                  
    23                                  
    24                                  KLOAD	equ 10000h ; Kernel loading address
    25                                  	; NOTE: Retro UNIX 8086 v1 /boot code loads kernel at 1000h:0000h 
    26                                  KCODE	equ 08h	; Code segment descriptor (ring 0)
    27                                  KDATA	equ 10h	; Data segment descriptor (ring 0)
    28                                  ; 19/03/2015
    29                                  UCODE	equ 1Bh ; 18h + 3h  (ring 3)
    30                                  UDATA	equ 23h ; 20h + 3h  (ring 3)
    31                                  ; 24/03/2015
    32                                  TSS	equ 28h	; Task state segment descriptor (ring 0)
    33                                  ; 19/03/2015
    34                                  CORE	equ 400000h  ; Start of USER's virtual/linear address space 
    35                                  		     ; (at the end of the 1st 4MB)
    36                                  ECORE	equ 0FFC00000h ; End of USER's virtual address space (4GB - 4MB)
    37                                  		     ; ULIMIT = (ECORE/4096) - 1 = 0FFBFFh (in GDT)
    38                                  
    39                                  ;; 27/12/2013
    40                                  ;KEND	equ KLOAD + 65536 ; (28/12/2013) (end of kernel space)
    41                                  ; 04/07/2016
    42                                  KEND    equ KERNELFSIZE + KLOAD
    43                                  
    44                                  
    45                                  ; IBM PC/AT BIOS ----- 10/06/85 (postequ.inc)
    46                                  ;--------- CMOS TABLE LOCATION ADDRESS'S -------------------------------------
    47                                  CMOS_SECONDS	EQU	00H		; SECONDS (BCD)
    48                                  CMOS_SEC_ALARM	EQU	01H		; SECONDS ALARM (BCD)
    49                                  CMOS_MINUTES	EQU	02H		; MINUTES (BCD)
    50                                  CMOS_MIN_ALARM	EQU	03H		; MINUTES ALARM (BCD) 	
    51                                  CMOS_HOURS	EQU	04H		; HOURS (BCD
    52                                  CMOS_HR_ALARM	EQU	005H		; HOURS ALARM   (BCD)
    53                                  CMOS_DAY_WEEK	EQU	06H		; DAY OF THE WEEK  (BCD)
    54                                  CMOS_DAY_MONTH	EQU	07H		; DAY OF THE MONTH (BCD) 
    55                                  CMOS_MONTH	EQU	08H		; MONTH (BCD)
    56                                  CMOS_YEAR	EQU	09H		; YEAR (TWO DIGITS) (BCD)
    57                                  CMOS_CENTURY	EQU	32H		; DATE CENTURY BYTE (BCD)
    58                                  CMOS_REG_A	EQU	0AH		; STATUS REGISTER A
    59                                  CMOS_REG_B	EQU	00BH		; STATUS REGISTER B  ALARM
    60                                  CMOS_REG_C	EQU	00CH		; STATUS REGISTER C  FLAGS
    61                                  CMOS_REG_D	EQU	0DH		; STATUS REGISTER D  BATTERY
    62                                  CMOS_SHUT_DOWN	EQU	0FH		; SHUTDOWN STATUS COMMAND BYTE
    63                                  ;----------------------------------------
    64                                  ;	CMOS EQUATES FOR THIS SYSTEM	;
    65                                  ;-----------------------------------------------------------------------------
    66                                  CMOS_PORT	EQU	070H		; I/O ADDRESS OF CMOS ADDRESS PORT
    67                                  CMOS_DATA	EQU	071H		; I/O ADDRESS OF CMOS DATA PORT
    68                                  NMI		EQU	10000000B	; DISABLE NMI INTERRUPTS MASK -
    69                                  					; HIGH BIT OF CMOS LOCATION ADDRESS
    70                                  
    71                                  ; Memory Allocation Table Address
    72                                  ; 05/11/2014
    73                                  ; 31/10/2014
    74                                  MEM_ALLOC_TBL	equ	100000h		; Memory Allocation Table at the end of
    75                                  					; the 1st 1 MB memory space.
    76                                  					; (This address must be aligned
    77                                  					;  on 128 KB boundary, if it will be
    78                                  					;  changed later.)
    79                                  					; ((lower 17 bits of 32 bit M.A.T.
    80                                  					;   address must be ZERO)).
    81                                  					; ((((Reason: 32 bit allocation 
    82                                  					;     instructions, dword steps)))
    83                                  					; (((byte >> 12 --> page >> 5)))  
    84                                  ;04/11/2014	
    85                                  PDE_A_PRESENT	equ	1		; Present flag for PDE
    86                                  PDE_A_WRITE	equ 	2		; Writable (write permission) flag
    87                                  PDE_A_USER	equ	4		; User (non-system/kernel) page flag
    88                                  ;
    89                                  PTE_A_PRESENT	equ	1		; Present flag for PTE (bit 0)
    90                                  PTE_A_WRITE	equ 	2		; Writable (write permission) flag (bit 1)
    91                                  PTE_A_USER	equ	4		; User (non-system/kernel) page flag (bit 2)
    92                                  PTE_A_ACCESS    equ	32		; Accessed flag (bit 5) ; 09/03/2015
    93                                  
    94                                  ; 17/02/2015 (unix386.s)
    95                                  ; 10/12/2014 - 30/12/2014 (0B000h -> 9000h) (dsectrm2.s)
    96                                  DPT_SEGM equ 09000h  ; FDPT segment (EDD v1.1, EDD v3)
    97                                  ;
    98                                  HD0_DPT	 equ 0	    ; Disk parameter table address for hd0
    99                                  HD1_DPT	 equ 32	    ; Disk parameter table address for hd1
   100                                  HD2_DPT	 equ 64	    ; Disk parameter table address for hd2
   101                                  HD3_DPT	 equ 96	    ; Disk parameter table address for hd3
   102                                  
   103                                  ; 15/11/2020
   104                                  VBE3INFOSEG equ 97E0h ; 512 bytes before Video_Pg_Backup
   105                                  ; 15/12/2020
   106                                  VBE3MODEINFOSEG equ 97C0h ; 512 bytes before VBE3INFOBLOCK 
   107                                  
   108                                  ; 29/11/2020
   109                                  VBE3INFOBLOCK equ 97E00h ; linear address (512 bytes)
   110                                  VBE3MODEINFOBLOCK equ 97C00h ; linear address (256 bytes)
   111                                  VBE3SAVERESTOREBLOCK equ 97600h ; linear address (2048 bytes)
   112                                  VBE3CRTCINFOBLOCK equ 97D80h ; linear address (64 bytes) ; 17/01/2021 
   113                                  VBE3BIOSDATABLOCK equ 97000h ; linear address (1536 bytes)
   114                                  VBE3STACKADDR equ 96000h ; linear address (1024 bytes)
   115                                  ; VBE3 32 bit Protected Mode Interface (16 bit) Selectors (in GDT)
   116                                  VBE3CS equ 30h ; _vbe3_CS:
   117                                  VBE3BDS equ 38h ; _vbe3_BDS:
   118                                  VBE3A000 equ 40h ; _A0000Sel:
   119                                  VBE3B000 equ 48h ; _B0000Sel:
   120                                  VBE3B800 equ 50h ; _B8000Sel:
   121                                  VBE3DS equ 58h ; _vbe3_DS:
   122                                  VBE3SS equ 60h ; _vbe3_SS:
   123                                  VBE3ES equ 68h ; _vbe3_ES:
   124                                  KCODE16 equ 70h ; _16bit_CS:
   125                                  ; 14/01/2021
   126                                  ; 06/12/2020
   127                                  VBE3VIDEOSTATE equ 95800h ; 2048 bytes
   128                                  ; 05/01/2021
   129                                  VGAFONT16USER equ 94000h ; 8x16 pixels user font (256 chars)	
   130                                  			 ; (reserved/allocated font space: 4096 bytes) 
   131                                  
   132                                  VGAFONT8USER equ 95000h	; 8x8 pixels user font (256 chars)	
   133                                  			; (reserved/allocated font space: 2048 bytes)
   134                                  ; 17/01/2021
   135                                  ; temporary (initial) location for EDID information
   136                                  VBE3EDIDINFOBLOCK equ 97D00h ; linear address (128 bytes)
   137                                   
   138                                  ; FDPT (Phoenix, Enhanced Disk Drive Specification v1.1, v3.0)
   139                                  ;      (HDPT: Programmer's Guide to the AMIBIOS, 1993)
   140                                  ;
   141                                  FDPT_CYLS	equ 0 ; 1 word, number of cylinders
   142                                  FDPT_HDS	equ 2 ; 1 byte, number of heads
   143                                  FDPT_TT		equ 3 ; 1 byte, A0h = translated FDPT with logical values
   144                                  		      ; otherwise it is standard FDPT with physical values 	
   145                                  FDPT_PCMP	equ 5 ; 1 word, starting write precompensation cylinder
   146                                  		      ; (obsolete for IDE/ATA drives)
   147                                  FDPT_CB		equ 8 ; 1 byte, drive control byte
   148                                  			; Bits 7-6 : Enable or disable retries (00h = enable)
   149                                  			; Bit 5	: 1 = Defect map is located at last cyl. + 1
   150                                  			; Bit 4 : Reserved. Always 0
   151                                  			; Bit 3 : Set to 1 if more than 8 heads
   152                                  			; Bit 2-0 : Reserved. Always 0
   153                                  FDPT_LZ		equ 12 ; 1 word, landing zone (obsolete for IDE/ATA drives)
   154                                  FDPT_SPT	equ 14 ; 1 byte, sectors per track
   155                                  
   156                                  ; Floppy Drive Parameters Table (Programmer's Guide to the AMIBIOS, 1993)
   157                                  ; (11 bytes long) will be used by diskette handler/bios
   158                                  ; which is derived from IBM PC-AT BIOS (DISKETTE.ASM, 21/04/1986).
   159                                  
   160                                  ; 01/02/2016
   161                                  Logical_DOSDisks equ 90000h + 100h ; 26*256 = 6656 bytes
   162                                  Directory_Buffer equ 80000h ; max = 64K Bytes
   163                                  FAT_Buffer	 equ 91C00h ; 1536 bytes (3 sectors)
   164                                  ; 15/02/2016
   165                                  Cluster_Buffer	 equ 70000h ; max = 64K Bytes ; buffer for file read & write
   166                                  ; 11/04/2016
   167                                  Env_Page:	 equ 93000h ; 512 bytes (4096 bytes)
   168                                  Env_Page_Size	 equ 512    ; (4096 bytes)
   169                                  ; 30/07/2016
   170                                  Video_Pg_Backup	 equ 98000h ; Mode 3h, video page backup (32K, 8 pages)
   171                                  
   172                                  ; 29/11/2020
   173                                  ; Free/Reserved memory blocks (in 1st 1MB): 93200h to 96000h (available)
   174                                  ; 06/12/2020
   175                                  ; Free/Reserved memory blocks (in 1st 1MB): 93200h to 95800h (available)
   176                                  
   177                                  ; 15/12/2020
   178                                  LFB_ADDR	equ LFB_Info+LFBINFO.LFB_addr
   179                                  LFB_SIZE	equ LFB_Info+LFBINFO.LFB_size
   180                                   
   181                                  [BITS 16]       ; We need 16-bit intructions for Real mode
   182                                  
   183                                  [ORG 0] 
   184                                  	; 12/11/2014
   185                                  	; Save boot drive number (that is default root drive)
   186 00000000 8816[EA6D]              	mov	[boot_drv], dl ; physical drv number
   187                                  
   188                                  	; Determine installed memory
   189                                  	; 31/10/2014
   190                                  	;
   191 00000004 B801E8                  	mov	ax, 0E801h ; Get memory size 
   192 00000007 CD15                    	int	15h	   ; for large configurations
   193 00000009 7308                    	jnc	short chk_ms
   194 0000000B B488                    	mov	ah, 88h    ; Get extended memory size 
   195 0000000D CD15                    	int	15h
   196                                  	;	   
   197                                  	;mov	al, 17h	; Extended memory (1K blocks) low byte
   198                                  	;out	70h, al ; select CMOS register
   199                                  	;in	al, 71h ; read data (1 byte)
   200                                  	;mov	cl, al
   201                                  	;mov	al, 18h ; Extended memory (1K blocks) high byte
   202                                  	;out	70h, al ; select CMOS register
   203                                  	;in	al, 71h ; read data (1 byte)
   204                                  	;mov	ch, al
   205                                   	;      
   206 0000000F 89C1                    	mov	cx, ax
   207 00000011 31D2                    	xor	dx, dx
   208                                  chk_ms:
   209 00000013 890E[E66D]              	mov	[mem_1m_1k], cx
   210 00000017 8916[E86D]              	mov	[mem_16m_64k], dx
   211                                  	; 05/11/2014
   212                                  	;and	dx, dx
   213                                  	;jz	short L2
   214 0000001B 81F90004                        cmp     cx, 1024
   215                                  	;jnb	short L0
   216 0000001F 7351                    	jnb	short V0 ; 14/11/2020
   217                                  		 ; insufficient memory_error	
   218                                  		 ; Minimum 2 MB memory is needed... 
   219                                  	; 05/11/2014
   220                                  	; (real mode error printing)
   221 00000021 FB                      	sti
   222 00000022 BE[3600]                	mov	si, msg_out_of_memory
   223 00000025 BB0700                  	mov	bx, 7
   224 00000028 B40E                    	mov	ah, 0Eh	; write tty
   225                                  oom_1:
   226 0000002A AC                      	lodsb
   227 0000002B 08C0                    	or	al, al
   228 0000002D 7404                    	jz	short oom_2
   229 0000002F CD10                    	int	10h
   230 00000031 EBF7                    	jmp	short oom_1
   231                                  oom_2:
   232 00000033 F4                              hlt
   233 00000034 EBFD                    	jmp	short oom_2
   234                                  
   235                                  ; 20/02/2017
   236                                  ; 05/11/2014
   237                                  msg_out_of_memory:
   238 00000036 070D0A                  	db 	07h, 0Dh, 0Ah
   239 00000039 496E73756666696369-             db      'Insufficient memory !'
   239 00000042 656E74206D656D6F72-
   239 0000004B 792021             
   240 0000004E 0D0A                    	db	0Dh, 0Ah
   241                                  _int13h_48h_buffer: ; 07/07/2016
   242 00000050 284D696E696D756D20-     	db	'(Minimum 2MB memory is needed.)'
   242 00000059 324D42206D656D6F72-
   242 00000062 79206973206E656564-
   242 0000006B 65642E29           
   243 0000006F 0D0A00                   	db	0Dh, 0Ah, 0
   244                                  V0:
   245                                  	; 15/12/2020
   246 00000072 8B36[E86D]              	mov	si, [mem_16m_64k]
   247 00000076 8936[E10E]              	mov	[real_mem_16m_64k], si
   248                                  	; 15/11/2020
   249                                  	; 14/11/2020 (TRDOS 386 v2.0.3)
   250                                  	; check VESA (VBE) VIDEO BIOS version
   251                                  
   252 0000007A B8034F                  	mov	ax, 4F03h  ; Return current VBE mode
   253 0000007D CD10                    	int	10h
   254 0000007F 83F84F                  	cmp	ax, 004Fh  ; successful (vbe) function call
   255 00000082 7567                    	jne	short L0   ; not a VESA VBE compatible bios	
   256                                  
   257                                  	;mov	ah, 3
   258                                  	;;jmp	short v1	
   259                                  	
   260                                  	; 15/11/2020
   261 00000084 BBE097                  	mov	bx, VBE3INFOSEG  ; 97E0h for current version 
   262 00000087 8EC3                    	mov	es, bx
   263 00000089 31FF                    	xor	di, di
   264 0000008B 2666C70556424532        	mov	dword [es:di], 'VBE2' ; request VESA VBE3 info
   265                                  		; es:di = buffer address (512 bytes)
   266                                  	;mov	ax, 4F00h ; Return VBE controller information
   267 00000093 86C4                    	xchg	al, ah
   268 00000095 CD10                    	int	10h
   269                                  	
   270                                  	; dx = cs
   271                                  	; es = VBE3INFOSEG (97E0h)
   272                                  	; di = 0
   273                                  	; ss = (endofkernelfile/16)+16
   274                                  	; sp = 0FFFEh
   275                                  
   276 00000097 83F84F                  	cmp	ax, 004Fh
   277 0000009A 754D                    	jne	short V1 ; old vga bios (not VESA compatible)
   278                                  
   279                                  	; 15/11/2020
   280 0000009C 2666813D56455341        	cmp	dword [es:di], 'VESA'
   281 000000A4 7543                    	jne	short V1
   282                                  	
   283                                  	;mov	ax, [es:di+4]
   284                                  	;	; ax = vbe version in BCD format (0200h or 0300h)
   285                                  	;mov	[vbe3], ah ; version number (major) 	
   286                                  
   287                                  	; 15/11/2020
   288 000000A6 268A4505                	mov	al, [es:di+5]
   289                                  		; al = high byte of VBE version number (02h or 03h)
   290                                  
   291 000000AA A2[5409]                	mov	[vbe3], al ; version number (major) 	
   292                                  			   ; 02h or 03h is expected
   293                                  	; 17/01/2021
   294                                  	; Read EDID
   295 000000AD B301                    	mov	bl, 01h	; Read EDID
   296 000000AF 31C9                    	xor	cx, cx	; Controller unit number
   297                                  			; (00 = primary controller)
   298 000000B1 31D2                    	xor	dx, dx	; EDID block number = 0
   299 000000B3 B8C097                  	mov	ax, VBE3MODEINFOSEG  ; 97C0h for current version
   300 000000B6 8EC0                    	mov	es, ax
   301 000000B8 BF0001                  	mov	di, VBE3EDIDINFOBLOCK - VBE3MODEINFOBLOCK
   302                                  	; es:di = temporary address of 128 bytes EDID information 
   303 000000BB B8154F                  	mov	ax, 4F15h ; VBE/DDC Services 
   304 000000BE CD10                    	int	10h
   305                                  	;cmp	ax, 4Fh
   306                                  	;jne	short v2
   307 000000C0 A2[2543]                	mov	[edid], al ; 4Fh > 0	
   308                                  ;V2:
   309                                  	; 17/01/2021
   310 000000C3 31FF                    	xor	di, di
   311                                  	; 15/12/2020
   312                                  	; Get linear frame buffer info (for VESA VBE mode 118h)
   313                                  	;mov	si, VBE3MODEINFOSEG  ; 97C0h for current version
   314                                  	;mov	es, si
   315                                   	; di = 0
   316 000000C5 B91841                  	mov	cx, 04118h  ; 1024*768, 24 bpp, LFB
   317 000000C8 B8014F                  	mov	ax, 4F01h ; Return VBE mode information
   318 000000CB CD10                    	int	10h
   319                                  	;cmp	ax, 4Fh
   320                                  	;jne	short V1
   321                                  	; 19/12/2020
   322                                  	;mov	si, [es:di+MODEINFO.PhysBasePtr+2]
   323                                  			; hw of LFB base address
   324                                  	; MODEINFO structure starts from offset -2
   325 000000CD 268B752A                	mov	si, [es:di+MODEINFO.PhysBasePtr] ; hw of LFB addr
   326 000000D1 8936[E30E]              	mov	[def_LFB_addr], si ; k_LFB_size = 3145728 bytes
   327 000000D5 81EE0001                	sub	si, 256
   328                                  	
   329                                  	; 15/12/2020
   330                                  	; check memory and decrease it to 3.5 GB if it is 4GB
   331                                  	; (reserve upper memory for LFB)
   332 000000D9 8B3E[E86D]              	mov	di, [mem_16m_64k]
   333 000000DD 893E[E10E]              	mov	[real_mem_16m_64k], di
   334                                  
   335 000000E1 39F7                    	cmp	di, si
   336 000000E3 7604                    	jna	short V1
   337                                  
   338 000000E5 8936[E86D]              	mov	[mem_16m_64k], si
   339                                  
   340                                  	; VESA VBE3 video hardware 
   341                                  	; (example: NVIDIA GEFORCE FX550, 256 MB)
   342                                  	; uses upper memory from 0D0000000h to 0DFFFFFFFh
   343                                  	
   344                                  	;;cmp	di, 0CF00h ; 3328 MB - 16MB
   345                                  	;jna	short V1  ; <= 3328 MB memory, it is not required
   346                                  			  ; decrease
   347                                  	;cmp	al, 3 
   348                                  	;jb	short V2 
   349                                  	; VESA VBE 3
   350                                  	;mov	word [mem_16m_64k], 0CF00h ; 3328 MB - 16MB
   351                                  	;jmp	short V1 	
   352                                  ;V2:
   353                                  	; VESA VBE 2
   354                                  	; Check Bochs/Qemu/VirtualBox Emulator
   355                                  	; LFB base address: 0E0000000h
   356                                  	;sub	ax, ax ; 0
   357                                  	;mov	dx, 1CEh ; VBE_DISPI_IOPORT_INDEX
   358                                  	;out	dx, ax ; VBE_DISPI_INDEX_ID register
   359                                  	;inc	dx
   360                                  	;in	ax, dx
   361                                  	;and	al, 0F0h
   362                                  	;cmp	ax, 0B0C0h
   363                                  	;jne	short V1
   364                                  	;
   365                                  	; BOCHS/QEMU/VIRTUALBOX
   366                                  	;mov	word [mem_16m_64k], 0DF00h ; 3584 MB - 16MB	
   367                                  V1:
   368 000000E9 1E                      	push	ds
   369 000000EA 07                      	pop	es ; restore extra data segment	
   370                                  L0:
   371                                  
   372                                  %include 'diskinit.s' ; 07/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.2 - diskinit.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 29/08/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.14 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; diskinit.inc (10/07/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - DISKINIT.INC
    20                              <1> ; Last Modification: 10/07/2015
    21                              <1> 
    22                              <1> ; DISK I/O SYSTEM INITIALIZATION - Erdogan Tan (Retro UNIX 386 v1 project)
    23                              <1> 
    24                              <1> ; ///////// DISK I/O SYSTEM STRUCTURE INITIALIZATION ///////////////
    25                              <1> 
    26                              <1> 	; 29/08/2020
    27                              <1> 	; 17/07/2020
    28                              <1> 	; 14/07/2020 (TRDOS 386 v2.0.2)
    29                              <1> 	; 10/12/2014 - 02/02/2015 - dsectrm2.s
    30                              <1> ;L0:
    31                              <1> 	; 12/11/2014 (Retro UNIX 386 v1 - beginning)
    32                              <1> 	; Detecting disk drives... (by help of ROM-BIOS)
    33 000000EB BA7F00              <1> 	mov	dx, 7Fh
    34                              <1> L1:	
    35 000000EE FEC2                <1> 	inc	dl
    36 000000F0 B441                <1> 	mov	ah, 41h ; Check extensions present
    37                              <1> 			; Phoenix EDD v1.1 - EDD v3
    38 000000F2 BBAA55              <1> 	mov	bx, 55AAh
    39 000000F5 CD13                <1> 	int 	13h
    40 000000F7 721A                <1> 	jc	short L2
    41                              <1> 
    42 000000F9 81FB55AA            <1> 	cmp	bx, 0AA55h
    43 000000FD 7514                <1> 	jne	short L2
    44 000000FF FE06[ED6D]          <1> 	inc	byte [hdc]	; count of hard disks (EDD present)
    45 00000103 8816[EC6D]          <1>         mov     [last_drv], dl  ; last hard disk number
    46 00000107 BB[706D]            <1> 	mov	bx, hd0_type - 80h
    47 0000010A 01D3                <1> 	add	bx, dx	 
    48 0000010C 880F                <1> 	mov	[bx], cl ; Interface support bit map in CX
    49                              <1> 			 ; Bit 0 - 1, Fixed disk access subset ready
    50                              <1> 			 ; Bit 1 - 1, Drv locking and ejecting ready
    51                              <1> 			 ; Bit 2 - 1, Enhanced Disk Drive Support
    52                              <1>                          ;            (EDD) ready (DPTE ready)
    53                              <1> 			 ; Bit 3 - 1, 64bit extensions are present
    54                              <1>                          ;            (EDD-3)
    55                              <1> 			 ; Bit 4 to 15 - 0, Reserved
    56 0000010E 80FA83              <1> 	cmp	dl, 83h	 ; drive number < 83h
    57 00000111 72DB                <1> 	jb	short L1
    58                              <1> L2:
    59                              <1> 	; 23/11/2014
    60                              <1> 	; 19/11/2014
    61 00000113 30D2                <1> 	xor	dl, dl  ; 0
    62                              <1> 	; 04/02/2016 (esi -> si)
    63 00000115 BE[EE6D]            <1> 	mov	si, fd0_type
    64                              <1> L3:
    65                              <1> 	; 14/01/2015
    66 00000118 8816[EB6D]          <1> 	mov	[drv], dl
    67                              <1> 	;
    68 0000011C B408                <1> 	mov 	ah, 08h ; Return drive parameters
    69 0000011E CD13                <1> 	int	13h	
    70 00000120 7210                <1> 	jc	short L4
    71                              <1> 		; BL = drive type (for floppy drives)
    72                              <1> 		; DL = number of floppy drives
    73                              <1> 		;		
    74                              <1> 		; ES:DI = Address of DPT from BIOS
    75                              <1> 		;
    76 00000122 881C                <1> 	mov	[si], bl ;  Drive type
    77                              <1> 			; 4 = 1.44 MB, 80 track, 3 1/2"
    78                              <1> 	; 14/01/2015
    79 00000124 E8DE01              <1> 	call	set_disk_parms
    80                              <1> 	; 10/12/2014
    81 00000127 81FE[EE6D]          <1> 	cmp	si, fd0_type
    82 0000012B 7705                <1> 	ja	short L4
    83 0000012D 46                  <1> 	inc	si ; fd1_type
    84 0000012E B201                <1> 	mov	dl, 1
    85 00000130 EBE6                <1> 	jmp	short L3
    86                              <1> L4:
    87 00000132 B27F                <1> 	mov	dl, 7Fh
    88                              <1> 	; 24/12/2014
    89 00000134 803E[ED6D]00        <1> 	cmp	byte [hdc], 0 ; EDD present or not ?	
    90 00000139 0F878700            <1>         ja      L10       ; yes, all fixed disk operations
    91                              <1> 			  ; will be performed according to
    92                              <1> 			  ; present EDD specification
    93                              <1> 
    94                              <1> 	; 17/07/2020
    95                              <1> 	; Note: Virtual CPU will not come here while 
    96                              <1> 	; running in QEMU, Bochs, VirtualBox emulators !!!
    97                              <1> 	
    98                              <1> 	; 17/07/2020
    99                              <1> 	; Older BIOS (INT 13h, AH = 48h is not available)
   100                              <1> L6:
   101 0000013D FEC2                <1> 	inc 	dl
   102 0000013F 8816[EB6D]          <1>         mov     [drv], dl
   103 00000143 8816[EC6D]          <1>         mov     [last_drv], dl ; 14/01/2015
   104 00000147 B408                <1> 	mov 	ah, 08h ; Return drive parameters
   105 00000149 CD13                <1> 	int	13h	; (conventional function)
   106 0000014B 0F82A801            <1>         jc      L13	; fixed disk drive not ready
   107 0000014F 8816[ED6D]          <1>         mov     [hdc], dl ; number of drives
   108                              <1> 	;; 14/01/2013
   109                              <1> 	;;push	cx
   110 00000153 E8AF01              <1> 	call	set_disk_parms
   111                              <1> 	;;pop	cx
   112                              <1> 	;
   113                              <1> 	;;and	cl, 3Fh	 ; sectors per track (bits 0-6)
   114 00000156 8A16[EB6D]          <1>         mov     dl, [drv]
   115 0000015A BB0401              <1> 	mov	bx, 65*4 ; hd0 parameters table (INT 41h)	
   116 0000015D 80FA80              <1> 	cmp	dl, 80h
   117 00000160 7603                <1> 	jna	short L7
   118 00000162 83C314              <1> 	add	bx, 5*4	 ; hd1 parameters table (INT 46h)
   119                              <1> L7:	
   120 00000165 31C0                <1> 	xor	ax, ax
   121 00000167 8ED8                <1> 	mov	ds, ax
   122 00000169 8B37                <1>         mov     si, [bx]
   123 0000016B 8B4702              <1>         mov     ax, [bx+2] 
   124 0000016E 8ED8                <1> 	mov	ds, ax
   125 00000170 3A4C0E              <1>         cmp     cl, [si+FDPT_SPT] ; sectors per track 
   126 00000173 0F857C01            <1>         jne     L12 ; invalid FDPT
   127 00000177 BF0000              <1> 	mov	di, HD0_DPT
   128 0000017A 80FA80              <1> 	cmp	dl, 80h
   129 0000017D 7603                <1> 	jna	short L8
   130 0000017F BF2000              <1> 	mov	di, HD1_DPT 
   131                              <1> L8:
   132                              <1> 	; 30/12/2014
   133 00000182 B80090              <1> 	mov	ax, DPT_SEGM
   134 00000185 8EC0                <1> 	mov	es, ax
   135                              <1> 	; 24/12/2014
   136 00000187 B90800              <1> 	mov	cx, 8
   137 0000018A F3A5                <1> 	rep	movsw  ; copy 16 bytes to the kernel's DPT location
   138 0000018C 8CC8                <1> 	mov	ax, cs
   139 0000018E 8ED8                <1> 	mov	ds, ax
   140                              <1> 
   141                              <1> 	; 02/02/2015
   142                              <1> 	;mov	cl, [drv]
   143                              <1> 	;mov	bl, cl
   144                              <1> 	;mov	ax, 1F0h
   145                              <1> 	;and	bl, 1
   146                              <1> 	;jz	short L9
   147                              <1> 	;shl	bl, 4
   148                              <1> 	;sub	ax, 1F0h-170h
   149                              <1> 
   150                              <1> 	; 17/07/2020 
   151                              <1> 	; (Only 1F0h port address must be valid for old ROM BIOSes)
   152 00000190 B8F001              <1> 	mov	ax, 1F0h
   153 00000193 B3A0                <1> 	mov	bl, 0A0h
   154 00000195 80FA80              <1> 	cmp	dl, 80h
   155 00000198 7603                <1> 	jna	short L9
   156                              <1> 	; dl = 81h
   157 0000019A 80C310              <1> 	add	bl, 10h  ; slave disk
   158                              <1> 	;sub	ax, 1F0h-170h
   159                              <1> L9:
   160 0000019D AB                  <1> 	stosw	; I/O PORT Base Address (1F0h, 170h)
   161 0000019E 050602              <1> 	add	ax, 206h
   162 000001A1 AB                  <1> 	stosw	; CONTROL PORT Address (3F6h, 376h)	
   163 000001A2 88D8                <1> 	mov	al, bl  ; bit 4, master/slave disk bit
   164                              <1> 	;add	al, 0A0h ; 17/07/2020
   165 000001A4 AA                  <1> 	stosb	; Device/Head Register upper nibble
   166                              <1> 	;
   167 000001A5 FE06[EB6D]          <1> 	inc	byte [drv]
   168 000001A9 BB[706D]            <1> 	mov	bx, hd0_type - 80h
   169 000001AC 01CB                <1> 	add	bx, cx
   170 000001AE 800F80              <1>         or      byte [bx], 80h  ; present sign (when lower nibble is 0)
   171 000001B1 A0[ED6D]            <1> 	mov	al, [hdc]
   172 000001B4 FEC8                <1> 	dec	al
   173 000001B6 0F843D01            <1>         jz      L13
   174 000001BA 80FA80              <1> 	cmp	dl, 80h
   175 000001BD 0F867CFF            <1>         jna	L6 ; Max. 2 hard disks  ; 17/07/2020 
   176 000001C1 E93301              <1>         jmp     L13
   177                              <1> L10:
   178 000001C4 FEC2                <1> 	inc 	dl
   179                              <1> 	; 25/12/2014
   180 000001C6 8816[EB6D]          <1> 	mov	[drv], dl
   181 000001CA B408                <1> 	mov 	ah, 08h ; Return drive parameters
   182 000001CC CD13                <1> 	int	13h	; (conventional function)
   183 000001CE 0F822501            <1>         jc      L13
   184                              <1> 	; 14/01/2015
   185 000001D2 8A16[EB6D]          <1> 	mov	dl, [drv]
   186 000001D6 52                  <1> 	push	dx
   187 000001D7 51                  <1> 	push	cx
   188 000001D8 E82A01              <1> 	call	set_disk_parms
   189 000001DB 59                  <1> 	pop	cx
   190 000001DC 5A                  <1> 	pop	dx
   191                              <1> 	; 06/07/2016 (BugFix for >64K kernel files)
   192                              <1> 	; 04/02/2016 (esi -> si)
   193                              <1> 	;mov	si, _end ; 30 byte temporary buffer address 	
   194                              <1> 	;		 ; at the '_end' of kernel.
   195                              <1> 	;mov	word [si], 30
   196                              <1> 	; 06/07/2016
   197 000001DD BE[5000]            <1> 	mov	si, _int13h_48h_buffer
   198                              <1> 	; 09/07/2016
   199 000001E0 B81E00              <1> 	mov	ax, 001Eh
   200 000001E3 8824                <1> 	mov	[si], ah ; 0
   201 000001E5 46                  <1> 	inc	si
   202 000001E6 8904                <1> 	mov	word [si], ax
   203                              <1>  	; word [si] = 30
   204                              <1> 	;
   205 000001E8 B448                <1> 	mov	ah, 48h	 ; Get drive parameters (EDD function)
   206 000001EA CD13                <1> 	int	13h
   207 000001EC 0F820701            <1>         jc      L13
   208                              <1> 
   209                              <1> 	; 29/08/2020
   210                              <1> 	; 04/02/2016 (ebx -> bx)
   211                              <1> 	; 14/01/2015
   212 000001F0 28FF                <1> 	sub	bh, bh
   213 000001F2 88D3                <1> 	mov	bl, dl
   214                              <1> 	;sub	bl, 80h
   215                              <1> 	; 29/08/2020
   216 000001F4 81C3[706D]          <1> 	add	bx, (hd0_type - 80h)
   217                              <1> 	;mov 	al, [bx]
   218 000001F8 8A07                <1> 	mov	al, [bx]
   219 000001FA 0C80                <1> 	or	al, 80h
   220 000001FC 8807                <1> 	mov 	[bx], al	
   221 000001FE 81EB[EE6D]          <1> 	sub	bx, hd0_type - 2 ; 15/01/2015
   222                              <1> 	;add	bx, drv.status
   223                              <1> 	;mov	[bx], al
   224                              <1> 	; 29/08/2020
   225 00000202 8887[3A6E]          <1> 	mov	[bx+drv.status], al
   226                              <1> 	; 04/02/2016 (eax -> ax)
   227                              <1> 	;mov	ax, [si+16]
   228                              <1> 	; 14/07/2020
   229                              <1> 	;mov	di, [si+18] 
   230                              <1> 	;;test	ax, [si+18]
   231                              <1> 	;test	ax, di ; 14/07/2020
   232                              <1> 	;jz	short L10_A0h ; (!) ; 17/07/2020
   233                              <1> 			; 'CHS only' disks on EDD system 
   234                              <1> 			;  are reported with ZERO disk size
   235                              <1> 			; (if so, we must not overwrite
   236                              <1> 			; calculated disk size in 'set_disk_parms')
   237                              <1> 	; 29/08/2020
   238 00000206 8B4410              <1> 	mov	ax, [si+16]
   239 00000209 8B7C12              <1> 	mov	di, [si+18]
   240 0000020C 09C0                <1> 	or	ax, ax
   241 0000020E 7504                <1> 	jnz	short L10_LBA
   242 00000210 09FF                <1> 	or	di, di
   243 00000212 740B                <1> 	jz	short L10_A0h
   244                              <1> L10_LBA:
   245                              <1> 	;sub	bx, drv.status
   246 00000214 C1E302              <1> 	shl	bx, 2
   247                              <1> 	;add	bx, drv.size ; disk size (in sectors)
   248                              <1> 	;mov	[bx], ax
   249                              <1> 	; 29/08/2020
   250 00000217 8987[1E6E]          <1> 	mov	[bx+drv.size], ax
   251                              <1> 	;mov	ax, [si+18]
   252                              <1> 	;;mov	[bx], ax
   253                              <1> 	;mov	[bx+2], ax ; BugFix ; 15/07/2020
   254                              <1> 	; 14/07/2020
   255                              <1> 	;mov	[bx+2], di ; 15/07/2020
   256                              <1> 	; 29/08/2020
   257 0000021B 89BF[206E]          <1> 	mov	[bx+drv.size+2], di
   258                              <1> L10_A0h: 
   259                              <1> 	; 17/07/2020
   260                              <1> 	; Note: Virtual CPU will jump here from above (!) test
   261                              <1> 	;	while running in QEMU
   262                              <1> 
   263                              <1> 	; Jump here to fix a ZERO (LBA) disk size problem 
   264                              <1> 	; for CHS disks (28/02/2015)
   265                              <1> 	
   266                              <1> 	; 30/12/2014
   267 0000021F BF0000              <1> 	mov	di, HD0_DPT
   268 00000222 88D0                <1> 	mov	al, dl
   269 00000224 83E003              <1> 	and 	ax, 3
   270 00000227 C0E005              <1> 	shl	al, 5 ; * 32
   271 0000022A 01C7                <1> 	add 	di, ax
   272 0000022C B80090              <1> 	mov	ax, DPT_SEGM
   273 0000022F 8EC0                <1> 	mov	es, ax
   274                              <1> 	;
   275 00000231 88E8                <1> 	mov	al, ch	; max. cylinder number (bits 0-7)
   276 00000233 88CC                <1> 	mov	ah, cl	
   277 00000235 C0EC06              <1> 	shr	ah, 6	; max. cylinder number (bits 8-9)
   278 00000238 40                  <1>  	inc	ax	; logical cylinders (limit 1024)
   279 00000239 AB                  <1> 	stosw		
   280 0000023A 88F0                <1> 	mov	al, dh	; max. head number
   281                              <1> 	;
   282 0000023C 30F6                <1> 	xor	dh, dh  ; 29/08/2020 (dh = 0 is needed here)
   283                              <1> 	;
   284 0000023E FEC0                <1> 	inc	al
   285 00000240 AA                  <1> 	stosb		; logical heads (limits 256)
   286 00000241 B0A0                <1> 	mov	al, 0A0h ; Indicates translated table
   287 00000243 AA                  <1> 	stosb
   288 00000244 8A440C              <1> 	mov	al, [si+12]
   289 00000247 AA                  <1> 	stosb		 ; physical sectors per track
   290 00000248 31C0                <1>  	xor	ax, ax
   291                              <1> 	;dec	ax	 ; 02/01/2015 
   292 0000024A AB                  <1> 	stosw		 ; precompensation (obsolete)
   293                              <1> 	;xor	al, al	 ; 02/01/2015	
   294 0000024B AA                  <1> 	stosb		 ; reserved
   295 0000024C B008                <1> 	mov	al, 8	 ; drive control byte
   296                              <1> 		         ; (do not disable retries, 
   297                              <1> 			 ; more than 8 heads)
   298 0000024E AA                  <1> 	stosb
   299 0000024F 8B4404              <1> 	mov	ax, [si+4]
   300 00000252 AB                  <1> 	stosw		 ; physical number of cylinders	
   301                              <1> 	;push	ax	 ; 02/01/2015
   302 00000253 8A4408              <1> 	mov	al, [si+8]
   303 00000256 AA                  <1> 	stosb		 ; physical num. of heads (limit 16)
   304 00000257 29C0                <1> 	sub 	ax, ax
   305                              <1> 	;pop	ax	 ; 02/01/2015	
   306 00000259 AB                  <1> 	stosw		 ; landing zone (obsolete)
   307 0000025A 88C8                <1> 	mov	al, cl	 ; logical sectors per track (limit 63)
   308 0000025C 243F                <1> 	and 	al, 3Fh	
   309 0000025E AA                  <1> 	stosb
   310                              <1> 	;sub	al, al	 ; checksum
   311                              <1> 	;stosb
   312                              <1> 	;
   313 0000025F 83C61A              <1> 	add	si, 26   ; (BIOS) DPTE address pointer
   314 00000262 AD                  <1> 	lodsw
   315 00000263 50                  <1> 	push	ax ; *	 ; (BIOS) DPTE offset
   316 00000264 AD                  <1> 	lodsw
   317 00000265 50                  <1> 	push	ax ; **	 ; (BIOS) DPTE segment
   318                              <1> 	;
   319                              <1> 	; checksum calculation
   320 00000266 89FE                <1> 	mov	si, di
   321 00000268 06                  <1> 	push	es
   322 00000269 1F                  <1> 	pop	ds
   323                              <1> 	;mov	cx, 16
   324 0000026A B90F00              <1> 	mov 	cx, 15
   325 0000026D 29CE                <1> 	sub	si, cx
   326 0000026F 30E4                <1> 	xor	ah, ah
   327                              <1> 	;del	cl
   328                              <1> L11:		
   329 00000271 AC                  <1> 	lodsb
   330 00000272 00C4                <1> 	add	ah, al
   331 00000274 E2FB                <1> 	loop	L11
   332                              <1> 	;
   333 00000276 88E0                <1> 	mov	al, ah
   334 00000278 F6D8                <1> 	neg	al	; -x+x = 0
   335 0000027A AA                  <1> 	stosb		; put checksum in byte 15 of the tbl
   336                              <1> 	;
   337 0000027B 1F                  <1> 	pop	ds ; **	; (BIOS) DPTE segment
   338 0000027C 5E                  <1> 	pop	si ; *	; (BIOS) DPTE offset	
   339                              <1> 	;
   340                              <1> 	; 14/07/2020
   341                              <1> 	; 0FFFFh:0FFFFh = invalid DPTE address
   342 0000027D 8B0C                <1> 	mov	cx, [si]
   343 0000027F 8B4402              <1> 	mov	ax, [si+2]
   344 00000282 21C1                <1> 	and	cx, ax
   345 00000284 41                  <1> 	inc	cx 
   346 00000285 7404                <1> 	jz	short L11c ; 0FFFFh:0FFFFh
   347 00000287 0B04                <1> 	or	ax, [si]
   348 00000289 752A                <1> 	jnz	short L11e ; <> 0
   349                              <1> L11c:
   350                              <1> 	; 17/07/2020
   351                              <1> 	; TRDOS 386 v2 DRVINIT assumptions:
   352                              <1> 	; (also by regarding QEMU, Bochs and VirtualBox settings)
   353                              <1> 	;	Hard disk 0 port address: 1F0h
   354                              <1> 	;	Hard disk 1 port address: 1F0h
   355                              <1> 	;	Hard disk 2 port address: 170h
   356                              <1> 	;	Hard disk 3 port address: 170h
   357                              <1> 
   358                              <1> 	; in QEMU, hda=hd0 (1F0h) and hdb=hd1 (1F0h) -IRQ14-
   359                              <1> 	;      and hdc=hd2 (170h) and hdd=hd3 (170h) -IRQ15-
   360                              <1> 
   361 0000028B B8F001              <1> 	mov	ax, 1F0h
   362                              <1> 
   363                              <1> 	; 15/07/2020
   364                              <1> 	; 14/07/2020
   365                              <1> 	; Invalid DPTE address...
   366                              <1> 	; Default DPTE parms must be set for DISK_IO_CONT
   367                              <1> 	; (diskio.s)
   368                              <1> 	; 17/07/2020
   369                              <1> 
   370                              <1> 	;mov	bl, dl
   371                              <1> 	;and	bl, 1
   372                              <1> 	;jz	short L11d
   373                              <1> 
   374 0000028E B3A0                <1> 	mov	bl, 0A0h
   375                              <1> 
   376 00000290 F6C201              <1> 	test	dl, 1
   377 00000293 7403                <1> 	jz	short L11g  ; Master (as default, for 80h & 82h))
   378                              <1> 	;shl	bl, 4 ; bl = 16 (bit 4 = 1 -> slave)
   379 00000295 80C310              <1> 	add	bl, 10h  ; Slave (as default, for 81h & 83h)
   380                              <1> L11g:
   381                              <1> 	; 17/07/2020
   382 00000298 80FA82              <1> 	cmp	dl, 82h	; Hard disk 3 or 4 ?
   383 0000029B 7203                <1> 	jb	short L11d ; Primary ATA channel (hd0, hd1)
   384                              <1> 			   ; (port address = 1F0h)
   385                              <1> 	
   386                              <1> 	; Secondary ATA channel (hd2, hd3)
   387                              <1> 	; (port address = 170h)
   388                              <1> 
   389 0000029D 2D8000              <1> 	sub	ax, 1F0h-170h
   390                              <1> L11d:
   391                              <1> 	; 14/07/2020
   392 000002A0 AB                  <1> 	stosw	; I/O PORT Base Address (1F0h, 170h)
   393 000002A1 050602              <1> 	add	ax, 206h
   394 000002A4 AB                  <1> 	stosw	; CONTROL PORT Address (3F6h, 376h)	
   395 000002A5 88D8                <1> 	mov	al, bl  ; Master/Slave bit (0 = Master)
   396                              <1> 	; 17/07/2020
   397                              <1> 	;or	al, 0A0h ; CHS (LBA enable bit = 0)
   398                              <1> 			 ; (Bits 5&7, reserved bits  =  1)
   399 000002A7 30E4                <1> 	xor	ah, ah
   400                              <1> 	;stosb	; Device/Head Register upper nibble
   401 000002A9 AB                  <1> 	stosw
   402 000002AA 30C0                <1> 	xor	al, al
   403 000002AC B90500              <1> 	mov	cx, 5
   404 000002AF F3AB                <1> 	rep	stosw ; clear remain part of the (fake) DPTE
   405 000002B1 0E                  <1> 	push	cs
   406 000002B2 1F                  <1> 	pop	ds
   407 000002B3 EB2E                <1> 	jmp	short L11f
   408                              <1> L11e:
   409                              <1> 	; 23/02/2015
   410 000002B5 57                  <1> 	push	di
   411                              <1> 	; ES:DI points to DPTE (FDPTE) location
   412                              <1> 	;;mov	cx, 8
   413                              <1> 	;mov	cl, 8
   414 000002B6 B90800              <1> 	mov	cx, 8 ; 14/07/2020
   415 000002B9 F3A5                <1> 	rep	movsw	
   416                              <1> 	;
   417                              <1> 	; 23/02/2015
   418                              <1> 	; (P)ATA drive and LBA validation
   419                              <1> 	; (invalidating SATA drives and setting
   420                              <1> 	; CHS type I/O for old type fixed disks)
   421 000002BB 5B                  <1> 	pop	bx
   422 000002BC 8CC8                <1> 	mov	ax, cs
   423 000002BE 8ED8                <1> 	mov	ds, ax
   424 000002C0 268B07              <1> 	mov	ax, [es:bx]
   425 000002C3 3DF001              <1> 	cmp	ax, 1F0h
   426 000002C6 7413                <1> 	je	short L11a
   427 000002C8 3D7001              <1> 	cmp	ax, 170h
   428 000002CB 740E                <1> 	je	short L11a
   429                              <1> 	; invalidation 
   430                              <1> 	; (because base port address is not 1F0h or 170h)
   431                              <1> 	;xor	bh, bh
   432                              <1> 	;mov	bl, dl
   433                              <1> 	; 29/08/2020
   434                              <1> 	;xor	dh, dh ; 0
   435 000002CD 89D3                <1> 	mov	bx, dx
   436                              <1> 	;sub	bl, 80h
   437                              <1> 	;mov	byte [bx+hd0_type], 0 ; not a valid disk drive !		
   438                              <1>         ;or	byte [bx+drv.status+2], 0F0h ; (failure sign)
   439                              <1> 	; 29/08/2020
   440 000002CF C687[706D]00        <1> 	mov	byte [bx+hd0_type-80h], 0
   441 000002D4 808F[BC6D]F0        <1> 	or	byte [bx+drv.status-7Eh], 0F0h
   442 000002D9 EB0F                <1> 	jmp	short L11b
   443                              <1> L11a:	
   444                              <1> 	; LBA validation
   445 000002DB 268A4704            <1> 	mov	al, [es:bx+4] ; Head register upper nibble
   446 000002DF A840                <1> 	test	al, 40h ; LBA bit (bit 6)
   447 000002E1 7507                <1> 	jnz	short L11b ; LBA type I/O is OK! (E0h or F0h)
   448                              <1> L11f:
   449                              <1> 	; force CHS type I/O for this drive (A0h or B0h)
   450                              <1> 	;sub	bh, bh
   451                              <1> 	;mov	bl, dl
   452                              <1> 	; 29/08/2020
   453                              <1> 	;xor	dh, dh ; 0
   454 000002E3 89D3                <1> 	mov	bx, dx
   455                              <1> 	;sub	bl, 80h ; 26/02/2015
   456                              <1>         ;and	byte [bx+drv.status+2], 0FEh ; clear bit 0
   457                              <1> 				; bit 0 = LBA ready bit
   458                              <1> 	; 29/08/2020
   459 000002E5 80A7[BC6D]FE        <1> 	and	byte [bx+drv.status-7Eh], 0FEh
   460                              <1> 	; 'diskio' procedure will check this bit !
   461                              <1> L11b:
   462 000002EA 3A16[EC6D]          <1> 	cmp	dl, [last_drv] ; 25/12/2014
   463 000002EE 7307                <1>         jnb     short L13
   464 000002F0 E9D1FE              <1>         jmp     L10
   465                              <1> 
   466                              <1> L12:
   467                              <1> 	; Restore data registers
   468 000002F3 8CC8                <1> 	mov	ax, cs
   469 000002F5 8ED8                <1> 	mov	ds, ax	
   470                              <1> L13:
   471                              <1> 	; 13/12/2014
   472 000002F7 0E                  <1> 	push	cs
   473 000002F8 07                  <1> 	pop	es
   474                              <1> L14:
   475                              <1> 	; clear keyboard buffer
   476 000002F9 B411                <1> 	mov 	ah, 11h
   477 000002FB CD16                <1> 	int 	16h
   478 000002FD 744D                <1> 	jz 	short L16 ; no keys in keyboard buffer
   479 000002FF B010                <1> 	mov	al, 10h
   480 00000301 CD16                <1> 	int 	16h
   481 00000303 EBF4                <1> 	jmp 	short L14
   482                              <1> 
   483                              <1> set_disk_parms:
   484                              <1> 	; 29/08/2020
   485                              <1> 	; 04/02/2016 (ebx -> bx)
   486                              <1> 	; 10/07/2015
   487                              <1> 	; 14/01/2015
   488                              <1> 	;push	bx
   489 00000305 28FF                <1> 	sub	bh, bh
   490 00000307 8A1E[EB6D]          <1> 	mov	bl, [drv]
   491 0000030B 80FB80              <1> 	cmp	bl, 80h
   492 0000030E 7203                <1> 	jb	short sdp0
   493 00000310 80EB7E              <1> 	sub	bl, 7Eh
   494                              <1> sdp0:	
   495                              <1> 	;add	bx, drv.status
   496                              <1>   	;mov	byte [bx], 80h ; 'Present' flag
   497                              <1> 	; 29/08/2020
   498 00000313 C687[3A6E]80        <1> 	mov	byte [bx+drv.status], 80h
   499                              <1> 	;
   500 00000318 88E8                <1> 	mov	al, ch ; last cylinder (bits 0-7)
   501 0000031A 88CC                <1> 	mov	ah, cl ; 
   502 0000031C C0EC06              <1> 	shr	ah, 6  ; last cylinder (bits 8-9)
   503                              <1> 	;sub	bx, drv.status
   504 0000031F D0E3                <1> 	shl	bl, 1
   505                              <1> 	;add	bx, drv.cylinders
   506 00000321 40                  <1> 	inc	ax  ; convert max. cyl number to cyl count		
   507                              <1> 	;mov	[bx], ax
   508                              <1> 	; 29/08/2020
   509 00000322 8987[F46D]          <1> 	mov	[bx+drv.cylinders], ax
   510 00000326 50                  <1> 	push	ax ; ** cylinders
   511                              <1> 	;sub	bx, drv.cylinders
   512                              <1> 	;add	bx, drv.heads
   513 00000327 30E4                <1> 	xor	ah, ah
   514 00000329 88F0                <1> 	mov	al, dh ; heads
   515 0000032B 40                  <1> 	inc	ax
   516                              <1> 	;mov	[bx], ax
   517                              <1> 	; 29/08/2020
   518 0000032C 8987[026E]          <1>         mov	[bx+drv.heads], ax
   519                              <1> 	;sub     bx, drv.heads
   520                              <1>         ;add     bx, drv.spt
   521 00000330 30ED                <1> 	xor	ch, ch
   522 00000332 80E13F              <1> 	and	cl, 3Fh	; sectors (bits 0-6)
   523                              <1> 	;mov	[bx], cx
   524                              <1>         ; 29/08/2020
   525 00000335 898F[106E]          <1> 	mov	[bx+drv.spt], cx
   526                              <1> 	;sub	bx, drv.spt
   527 00000339 D1E3                <1> 	shl	bx, 1
   528                              <1> 	;add	bx, drv.size ; disk size (in sectors)
   529                              <1> 	; LBA size = cylinders * heads * secpertrack
   530 0000033B F7E1                <1> 	mul	cx 
   531 0000033D 89C2                <1> 	mov	dx, ax	; heads*spt					
   532 0000033F 58                  <1> 	pop	ax ; ** cylinders
   533 00000340 48                  <1> 	dec	ax ; 1 cylinder reserved (!?)
   534 00000341 F7E2                <1> 	mul	dx ; cylinders * (heads*spt)		
   535                              <1> 	;mov	[bx], ax
   536                              <1> 	;mov	[bx+2], dx
   537                              <1> 	; 29/08/2020
   538 00000343 8987[1E6E]          <1> 	mov	[bx+drv.size], ax
   539 00000347 8997[206E]          <1> 	mov	[bx+drv.size+2], dx
   540                              <1> 	;
   541                              <1> 	;pop	bx
   542 0000034B C3                  <1> 	retn
   543                              <1> 
   544                              <1> L16:	; 28/05/2016
   373                                  
   374                                  	; 10/11/2014
   375 0000034C FA                           	cli	; Disable interrupts (clear interrupt flag)
   376                                  		; Reset Interrupt MASK Registers (Master&Slave)
   377                                  	;mov	al, 0FFh	; mask off all interrupts
   378                                  	;out	21h, al		; on master PIC (8259)
   379                                  	;jmp 	$+2  ; (delay)
   380                                  	;out	0A1h, al	; on slave PIC (8259)
   381                                  	;
   382                                  	; Disable NMI 
   383 0000034D B080                    	mov   	al, 80h 
   384 0000034F E670                    	out   	70h, al		; set bit 7 to 1 for disabling NMI
   385                                  	;23/02/2015
   386                                  	;nop			;
   387                                  	;in	al, 71h		; read in 71h just after writing out to 70h
   388                                  				; for preventing unknown state (!?)
   389                                  	;
   390                                   	; 20/08/2014
   391                                  	; Moving the kernel 64 KB back (to physical address 0)
   392                                  	; DS = CS = 1000h
   393                                  	; 05/11/2014
   394 00000351 31C0                    	xor	ax, ax
   395 00000353 8EC0                    	mov	es, ax ; ES = 0
   396                                  	;
   397                                  	; 04/07/2016 - TRDOS 386 (64K - 128K kernel)
   398 00000355 31F6                          	xor	si, si
   399 00000357 31FF                    	xor	di, di
   400 00000359 B90040                  	mov	cx, 16384
   401 0000035C F366A5                  	rep	movsd
   402                                  	;
   403 0000035F 06                      	push	es ; 0
   404 00000360 68[6403]                	push	L17
   405 00000363 CB                      	retf
   406                                  L17:
   407 00000364 B90010                  	mov	cx, 1000h
   408 00000367 8EC1                    	mov	es, cx  ; 1000h 
   409 00000369 01C9                    	add	cx, cx
   410 0000036B 8ED9                    	mov	ds, cx  ; 2000h
   411 0000036D 29F6                    	sub	si, si
   412 0000036F 29FF                    	sub	di, di
   413 00000371 B90040                  	mov	cx, 16384
   414 00000374 F366A5                  	rep	movsd
   415                                  	
   416                                  	; Turn off the floppy drive motor
   417 00000377 BAF203                          mov     dx, 3F2h
   418 0000037A EE                              out     dx, al ; 0 ; 31/12/2013
   419                                  
   420                                  	; Enable access to memory above one megabyte
   421                                  L18:
   422 0000037B E464                    	in	al, 64h
   423 0000037D A802                    	test	al, 2
   424 0000037F 75FA                            jnz     short L18
   425 00000381 B0D1                    	mov	al, 0D1h	; Write output port
   426 00000383 E664                    	out	64h, al
   427                                  L19:
   428 00000385 E464                    	in	al, 64h
   429 00000387 A802                    	test	al, 2
   430 00000389 75FA                            jnz     short L19
   431 0000038B B0DF                    	mov	al, 0DFh	; Enable A20 line
   432 0000038D E660                    	out	60h, al
   433                                  ;L20:
   434                                  	;
   435                                  	; Load global descriptor table register
   436                                  
   437                                          ;mov     ax, cs
   438                                          ;mov     ds, ax
   439                                  
   440 0000038F 2E0F0116[586D]                  lgdt    [cs:gdtd]
   441                                  
   442 00000395 0F20C0                          mov     eax, cr0
   443                                  	; or 	eax, 1
   444 00000398 40                      	inc     ax
   445 00000399 0F22C0                  	mov     cr0, eax
   446                                  
   447                                  	; Jump to 32 bit code
   448                                  	
   449 0000039C 66                      	db 66h 			; Prefix for 32-bit
   450 0000039D EA                      	db 0EAh 		; Opcode for far jump
   451 0000039E [A4030000]              	dd StartPM 		; Offset to start, 32-bit
   452                                  				; (1000h:StartPM = StartPM + 10000h)
   453 000003A2 0800                    	dw KCODE		; This is the selector for CODE32_DESCRIPTOR,
   454                                  				; assuming that StartPM resides in code32
   455                                  
   456                                  ; 20/02/2017
   457                                  
   458                                  
   459                                  [BITS 32] 
   460                                  
   461                                  StartPM:
   462                                  	; Kernel Base Address = 0 ; 30/12/2013
   463 000003A4 66B81000                	mov ax, KDATA           ; Save data segment identifier
   464 000003A8 8ED8                            mov ds, ax              ; Move a valid data segment into DS register
   465 000003AA 8EC0                           	mov es, ax              ; Move data segment into ES register
   466 000003AC 8EE0                           	mov fs, ax              ; Move data segment into FS register
   467 000003AE 8EE8                          	mov gs, ax              ; Move data segment into GS register
   468 000003B0 8ED0                            mov ss, ax              ; Move data segment into SS register
   469 000003B2 BC00000900                      mov esp, 90000h         ; Move the stack pointer to 090000h
   470                                  
   471                                  clear_bss: ; Clear uninitialized data area
   472                                  	; 11/03/2015
   473 000003B7 31C0                    	xor  eax, eax ; 0
   474 000003B9 B9F9640000              	mov  ecx, (bss_end - bss_start)/4
   475                                  	;shr  ecx, 2 ; bss section is already aligned for double words
   476 000003BE BF[A67E0100]            	mov  edi, bss_start	
   477 000003C3 F3AB                    	rep  stosd  		
   478                                  
   479                                  memory_init:
   480                                  	; Initialize memory allocation table and page tables
   481                                  	; 16/11/2014
   482                                  	; 15/11/2014
   483                                  	; 07/11/2014
   484                                  	; 06/11/2014
   485                                  	; 05/11/2014
   486                                  	; 04/11/2014
   487                                  	; 31/10/2014 (Retro UNIX 386 v1 - Beginning) 
   488                                  	;
   489                                  ;	xor	eax, eax
   490                                  ;	xor 	ecx, ecx
   491 000003C5 B108                    	mov	cl, 8
   492 000003C7 BF00001000              	mov	edi, MEM_ALLOC_TBL	
   493 000003CC F3AB                    	rep	stosd		   ; clear Memory Allocation Table
   494                                  				   ; for the first 1 MB memory
   495                                  	;
   496 000003CE 668B0D[E66D0000]        	mov	cx, [mem_1m_1k]	   ; Number of contiguous KB between
   497                                  				   ; 1 and 16 MB, max. 3C00h = 15 MB.
   498 000003D5 66C1E902                	shr	cx, 2		   ; convert 1 KB count to 4 KB count
   499 000003D9 890D[98810100]          	mov	[free_pages], ecx
   500 000003DF 668B15[E86D0000]        	mov	dx, [mem_16m_64k]  ; Number of contiguous 64 KB blocks
   501                                  				   ; between 16 MB and 4 GB.	
   502 000003E6 6609D2                  	or	dx, dx
   503 000003E9 7413                    	jz	short mi_0
   504                                  	;
   505 000003EB 6689D0                  	mov	ax, dx
   506 000003EE C1E004                  	shl	eax, 4		   ; 64 KB -> 4 KB (page count)
   507 000003F1 0105[98810100]          	add	[free_pages], eax
   508 000003F7 0500100000              	add	eax, 4096	   ; 16 MB = 4096 pages
   509 000003FC EB07                    	jmp	short mi_1
   510                                  mi_0:
   511 000003FE 6689C8                  	mov	ax, cx
   512 00000401 66050001                	add	ax, 256		   ; add 256 pages for the first 1 MB		 
   513                                  mi_1:
   514 00000405 A3[94810100]            	mov	[memory_size], eax ; Total available memory in pages
   515                                  				   ; 1 alloc. tbl. bit = 1 memory page
   516                                  				   ; 32 allocation bits = 32 mem. pages   
   517                                  	;
   518 0000040A 05FF7F0000              	add	eax, 32767	   ; 32768 memory pages per 1 M.A.T. page 	
   519 0000040F C1E80F                  	shr	eax, 15		   ; ((32768 * x) + y) pages (y < 32768)
   520                                  				   ;  --> x + 1 M.A.T. pages, if y > 0
   521                                  				   ;  --> x M.A.T. pages, if y = 0
   522 00000412 66A3[A8810100]          	mov	[mat_size], ax	   ; Memory Alloc. Table Size in pages		
   523 00000418 C1E00C                  	shl	eax, 12		   ; 1 M.A.T. page = 4096 bytes
   524                                  	;			   ; Max. 32 M.A.T. pages (4 GB memory)
   525 0000041B 89C3                    	mov	ebx, eax	   ; M.A.T. size in bytes
   526                                  	; Set/Calculate Kernel's Page Directory Address
   527 0000041D 81C300001000            	add	ebx, MEM_ALLOC_TBL
   528 00000423 891D[90810100]          	mov	[k_page_dir], ebx  ; Kernel's Page Directory address
   529                                  				   ; just after the last M.A.T. page
   530                                  	;
   531 00000429 83E804                  	sub	eax, 4		   ; convert M.A.T. size to offset value
   532 0000042C A3[A0810100]            	mov	[last_page], eax   ; last page ofset in the M.A.T.
   533                                  	;			   ; (allocation status search must be 
   534                                  				   ; stopped after here)	
   535 00000431 31C0                    	xor	eax, eax
   536 00000433 48                      	dec	eax		   ; FFFFFFFFh (set all bits to 1)	
   537 00000434 6651                    	push	cx
   538 00000436 C1E905                  	shr	ecx, 5		   ; convert 1 - 16 MB page count to 
   539                                  				   ; count of 32 allocation bits
   540 00000439 F3AB                    	rep	stosd
   541 0000043B 6659                    	pop	cx
   542 0000043D 40                      	inc	eax		   ; 0	
   543 0000043E 80E11F                  	and	cl, 31		   ; remain bits
   544 00000441 7412                    	jz	short mi_4
   545 00000443 8907                    	mov	[edi], eax	   ; reset	
   546                                  mi_2:
   547 00000445 0FAB07                  	bts	[edi], eax	   ; 06/11/2014		
   548 00000448 FEC9                    	dec	cl
   549 0000044A 7404                    	jz	short mi_3
   550 0000044C FEC0                    	inc	al
   551 0000044E EBF5                    	jmp	short mi_2
   552                                  mi_3:
   553 00000450 28C0                    	sub	al, al	   	   ; 0
   554 00000452 83C704                  	add	edi, 4		   ; 15/11/2014
   555                                  mi_4:
   556 00000455 6609D2                  	or	dx, dx		  ; check 16M to 4G memory space	
   557 00000458 7421                    	jz	short mi_6	  ; max. 16 MB memory, no more...
   558                                  	;	
   559 0000045A B900021000              	mov	ecx, MEM_ALLOC_TBL + 512 ; End of first 16 MB memory
   560                                  	;	
   561 0000045F 29F9                    	sub	ecx, edi	  ; displacement (to end of 16 MB)
   562 00000461 7406                    	jz	short mi_5	  ; jump if EDI points to 
   563                                  				  ;         end of first 16 MB	
   564 00000463 D1E9                    	shr	ecx, 1		  ; convert to dword count
   565 00000465 D1E9                    	shr	ecx, 1		  ; (shift 2 bits right) 
   566 00000467 F3AB                    	rep 	stosd		  ; reset all bits for reserved pages
   567                                  				  ; (memory hole under 16 MB)
   568                                  mi_5:
   569 00000469 6689D1                  	mov	cx, dx		  ; count of 64 KB memory blocks
   570 0000046C D1E9                    	shr	ecx, 1		  ; 1 alloc. dword per 128 KB memory
   571 0000046E 9C                      	pushf			  ; 16/11/2014		
   572 0000046F 48                      	dec	eax		  ; FFFFFFFFh (set all bits to 1)
   573 00000470 F3AB                    	rep	stosd
   574 00000472 40                      	inc	eax		  ; 0
   575 00000473 9D                      	popf			  ; 16/11/2014
   576 00000474 7305                    	jnc	short mi_6
   577 00000476 6648                    	dec	ax		  ; eax = 0000FFFFh
   578 00000478 AB                      	stosd
   579 00000479 6640                    	inc	ax		  ; 0		
   580                                  mi_6:
   581 0000047B 39DF                    	cmp	edi, ebx	  ; check if EDI points to 	
   582 0000047D 730A                    	jnb	short mi_7	  ; end of memory allocation table
   583                                  	;			  ; (>= MEM_ALLOC_TBL + 4906) 
   584 0000047F 89D9                    	mov	ecx, ebx	  ; end of memory allocation table
   585 00000481 29F9                    	sub	ecx, edi	  ; convert displacement/offset
   586 00000483 D1E9                    	shr	ecx, 1		  ; to dword count 	 		
   587 00000485 D1E9                    	shr	ecx, 1		  ; (shift 2 bits right) 
   588 00000487 F3AB                    	rep 	stosd		  ; reset all remain M.A.T. bits
   589                                  mi_7:
   590                                  	; Reset M.A.T. bits in M.A.T. (allocate M.A.T. pages)
   591 00000489 BA00001000              	mov	edx, MEM_ALLOC_TBL
   592                                  	;sub	ebx, edx	  ; Mem. Alloc. Tbl. size in bytes
   593                                  	;shr	ebx, 12		  ; Mem. Alloc. Tbl. size in pages	
   594 0000048E 668B0D[A8810100]        	mov	cx, [mat_size]	  ; Mem. Alloc. Tbl. size in pages
   595 00000495 89D7                    	mov	edi, edx
   596 00000497 C1EF0F                  	shr	edi, 15		  ; convert M.A.T. address to
   597                                  				  ; byte offset in M.A.T.
   598                                  				  ; (1 M.A.T. byte points to 
   599                                  				  ;	      32768 bytes)
   600                                  				  ; Note: MEM_ALLOC_TBL address 
   601                                  				  ; must be aligned on 128 KB 
   602                                  				  ; boundary!
   603 0000049A 01D7                    	add	edi, edx	  ; points to M.A.T.'s itself	
   604                                  	; eax = 0
   605 0000049C 290D[98810100]          	sub	[free_pages], ecx ; 07/11/2014
   606                                  mi_8:
   607 000004A2 0FB307                  	btr	[edi], eax	  ; clear bit 0 to bit x (1 to 31)
   608                                  	;dec	bl
   609 000004A5 FEC9                    	dec	cl
   610 000004A7 7404                    	jz	short mi_9
   611 000004A9 FEC0                    	inc	al
   612 000004AB EBF5                    	jmp	short mi_8
   613                                  mi_9:
   614                                  	;
   615                                  	; Reset Kernel's Page Dir. and Page Table bits in M.A.T.
   616                                  	;		(allocate pages for system page tables)
   617                                  
   618                                  	; edx = MEM_ALLOC_TBL
   619 000004AD 8B0D[94810100]          	mov	ecx, [memory_size] ; memory size in pages (PTEs)
   620 000004B3 81C1FF030000            	add	ecx, 1023	 ; round up (1024 PTEs per table)	 	
   621 000004B9 C1E90A                  	shr	ecx, 10		 ; convert memory page count to 
   622                                  				 ; page table count (PDE count)
   623                                  	;
   624 000004BC 51                      	push	ecx		 ; (**) PDE count (<= 1024)
   625                                  	;
   626 000004BD 41                      	inc	ecx		 ; +1 for kernel page directory	
   627                                  	;
   628 000004BE 290D[98810100]          	sub	[free_pages], ecx ; 07/11/2014
   629                                  	;
   630 000004C4 8B35[90810100]          	mov	esi, [k_page_dir] ; Kernel's Page Directory address
   631 000004CA C1EE0C                  	shr	esi, 12		 ; convert to page number
   632                                  mi_10:
   633 000004CD 89F0                    	mov	eax, esi	 ; allocation bit offset		 
   634 000004CF 89C3                    	mov	ebx, eax
   635 000004D1 C1EB03                  	shr	ebx, 3		 ; convert to alloc. byte offset
   636 000004D4 80E3FC                  	and	bl,  0FCh	 ; clear bit 0 and bit 1
   637                                  				 ;   to align on dword boundary
   638 000004D7 83E01F                  	and	eax, 31		 ; set allocation bit position 
   639                                  				 ;  (bit 0 to bit 31)
   640                                  	;
   641 000004DA 01D3                    	add	ebx, edx	 ; offset in M.A.T. + M.A.T. address 
   642                                  	;
   643 000004DC 0FB303                  	btr 	[ebx], eax	 ; reset relevant bit (0 to 31)
   644                                  	;
   645 000004DF 46                      	inc	esi		 ; next page table
   646 000004E0 E2EB                    	loop	mi_10		 ; allocate next kernel page table 
   647                                  				 ; (ecx = page table count + 1)		
   648                                  	;
   649 000004E2 59                      	pop	ecx		 ; (**) PDE count (= pg. tbl. count)
   650                                  	;
   651                                  	; Initialize Kernel Page Directory and Kernel Page Tables
   652                                  	;
   653                                  	; Initialize Kernel's Page Directory
   654 000004E3 8B3D[90810100]          	mov	edi, [k_page_dir]
   655 000004E9 89F8                    	mov	eax, edi
   656 000004EB 0C03                    	or	al, PDE_A_PRESENT + PDE_A_WRITE
   657                                  				; supervisor + read&write + present
   658 000004ED 89CA                    	mov	edx, ecx 	; (**) PDE count (= pg. tbl. count)	
   659                                  mi_11:
   660 000004EF 0500100000              	add	eax, 4096	; Add page size (PGSZ)
   661                                  			        ; EAX points to next page table
   662 000004F4 AB                      	stosd
   663 000004F5 E2F8                    	loop	mi_11
   664 000004F7 29C0                    	sub	eax, eax	; Empty PDE
   665 000004F9 66B90004                	mov	cx, 1024	; Entry count (PGSZ/4)
   666 000004FD 29D1                    	sub	ecx, edx
   667 000004FF 7402                    	jz	short mi_12
   668 00000501 F3AB                    	rep	stosd 		; clear remain (empty) PDEs
   669                                  	;
   670                                  	; Initialization of Kernel's Page Directory is OK, here.
   671                                  mi_12:
   672                                  	; Initialize Kernel's Page Tables
   673                                  	;
   674                                  	; (EDI points to address of page table 0)
   675                                  	; eax = 0
   676 00000503 8B0D[94810100]          	mov	ecx, [memory_size] ; memory size in pages
   677 00000509 89CA                    	mov	edx, ecx	; (***)
   678 0000050B B003                    	mov	al, PTE_A_PRESENT + PTE_A_WRITE
   679                                  			     ; supervisor + read&write + present 	
   680                                  mi_13:
   681 0000050D AB                      	stosd
   682 0000050E 0500100000              	add	eax, 4096	
   683 00000513 E2F8                    	loop	mi_13	
   684 00000515 6681E2FF03              	and	dx, 1023	; (***)
   685 0000051A 740B                    	jz	short mi_14
   686 0000051C 66B90004                	mov	cx, 1024	
   687 00000520 6629D1                  	sub	cx, dx		; from dx (<= 1023) to 1024
   688 00000523 31C0                    	xor	eax, eax
   689 00000525 F3AB                    	rep	stosd		; clear remain (empty) PTEs 
   690                                  				; of the last page table
   691                                  mi_14:
   692                                  	;  Initialization of Kernel's Page Tables is OK, here.
   693                                  	;
   694 00000527 89F8                    	mov	eax, edi	; end of the last page table page
   695                                  			        ; (beginging of user space pages)
   696 00000529 C1E80F                  	shr	eax, 15		; convert to M.A.T. byte offset
   697 0000052C 24FC                    	and	al, 0FCh	; clear bit 0 and bit 1 for
   698                                  				; aligning on dword boundary	
   699                                  	 
   700 0000052E A3[A4810100]            	mov	[first_page], eax
   701 00000533 A3[9C810100]            	mov	[next_page], eax ; The first free page pointer
   702                                  				 ; for user programs
   703                                  				 ; (Offset in Mem. Alloc. Tbl.)	
   704                                  	;
   705                                  	; Linear/FLAT (1 to 1) memory paging for the kernel is OK, here.
   706                                  	;
   707                                  	
   708                                  	; Enable paging
   709                                  	;
   710 00000538 A1[90810100]                    mov     eax, [k_page_dir]
   711 0000053D 0F22D8                  	mov	cr3, eax
   712 00000540 0F20C0                  	mov	eax, cr0
   713 00000543 0D00000080              	or	eax, 80000000h	; set paging bit (bit 31)
   714 00000548 0F22C0                  	mov	cr0, eax
   715                                          ;jmp    KCODE:StartPMP
   716                                  
   717 0000054B EA                      	db 0EAh 		; Opcode for far jump
   718 0000054C [52050000]                      dd StartPMP		; 32 bit offset
   719 00000550 0800                    	dw KCODE		; kernel code segment descriptor
   720                                  
   721                                  StartPMP:
   722                                  	; 06/11//2014
   723                                  	; Clear video page 0
   724                                  	;
   725                                  	; Temporary Code
   726                                  	;
   727 00000552 B9E8030000              	mov	ecx, 80*25/2
   728 00000557 BF00800B00              	mov	edi, 0B8000h
   729                                  	; 30/01/2016
   730                                  	;xor	eax, eax	; black background, black fore color
   731 0000055C B800070007              	mov	eax, 07000700h  ; black background, light gray fore color
   732 00000561 F3AB                    	rep	stosd
   733                                  	
   734                                  	; 19/08/2014
   735                                  	; Kernel Base Address = 0
   736                                  	; It is mapped to (physically) 0 in the page table.
   737                                  	; So, here is exactly 'StartPMP' address.
   738                                  
   739                                   	; 29/01/2016 (TRDOS 386 = TRDOS v2.0)
   740 00000563 BE[02450100]            	mov	esi, starting_msg
   741                                  	;; 14/08/2015 (kernel version message will appear
   742                                  	;;	       when protected mode and paging is enabled)
   743 00000568 BF00800B00              	mov	edi, 0B8000h ; 27/08/2014
   744                                  	
   745                                  	; 30/11/2020
   746                                  	; 14/11/2020 (TRDOS 386 v2.0.3)
   747                                  	;cmp	byte [vbe3], 3 ; 03h
   748                                  	;jne	short pkv_1
   749                                  	;;mov	ah, 0Bh ; Black background, light cyan forecolor
   750                                  	;; Light red TRDOS 386 version text shows VBE3 is ready !
   751                                  	;mov	ah, 0Ch ; Black background, light red forecolor
   752                                  	;jmp	short pkv_2
   753                                  ;pkv_1:
   754 0000056D B40A                    	mov	ah, 0Ah ; Black background, light green forecolor
   755                                  ;pkv_2:
   756                                  	; 20/08/2014
   757 0000056F E8D6030000              	call	printk
   758                                  
   759                                  	; 'UNIX v7/x86' source code by Robert Nordier (1999)
   760                                  	; // Set IRQ offsets
   761                                  	;
   762                                  	;  Linux (v0.12) source code by Linus Torvalds (1991)
   763                                  	;
   764                                  					;; ICW1
   765 00000574 B011                    	mov	al, 11h			; Initialization sequence
   766 00000576 E620                    	out	20h, al			; 	8259A-1
   767                                  	; jmp 	$+2
   768 00000578 E6A0                    	out	0A0h, al		; 	8259A-2
   769                                  					;; ICW2
   770 0000057A B020                    	mov	al, 20h			; Start of hardware ints (20h)
   771 0000057C E621                    	out	21h, al			;	for 8259A-1
   772                                  	; jmp 	$+2
   773 0000057E B028                    	mov	al, 28h			; Start of hardware ints (28h)
   774 00000580 E6A1                    	out	0A1h, al		; 	for 8259A-2
   775                                  					;
   776 00000582 B004                    	mov	al, 04h			;; ICW3
   777 00000584 E621                    	out	21h, al			; 	IRQ2 of 8259A-1 (master)
   778                                  	; jmp 	$+2
   779 00000586 B002                    	mov	al, 02h			; 	is 8259A-2 (slave)
   780 00000588 E6A1                    	out	0A1h, al		;
   781                                  					;; ICW4
   782 0000058A B001                    	mov	al, 01h	 		;
   783 0000058C E621                    	out	21h, al			; 	8086 mode, normal EOI	
   784                                  	; jmp 	$+2
   785 0000058E E6A1                    	out	0A1h, al		;	for both chips.
   786                                  
   787                                  	;mov	al, 0FFh	; mask off all interrupts for now
   788                                  	;out	21h, al
   789                                  	;; jmp 	$+2
   790                                  	;out	0A1h, al
   791                                  
   792                                  	; 02/04/2015
   793                                  	; 26/03/2015 System call (INT 30h) modification
   794                                  	;  DPL = 3 (Interrupt service routine can be called from user mode)			
   795                                  	;
   796                                  	;; Linux (v0.12) source code by Linus Torvalds (1991)
   797                                  	;  setup_idt:
   798                                  	;
   799                                          ;; 16/02/2015
   800                                  	;;mov     dword [DISKETTE_INT], fdc_int ; IRQ 6 handler
   801                                  	; 21/08/2014 (timer_int)
   802 00000590 BE[A0410100]            	mov	esi, ilist
   803 00000595 8D3D[A87E0100]          	lea	edi, [idt]
   804                                  	; 26/03/2015
   805 0000059B B930000000              	mov	ecx, 48		; 48 hardware interrupts (INT 0 to INT 2Fh)
   806                                  	; 02/04/2015
   807 000005A0 BB00000800              	mov	ebx,  80000h
   808                                  rp_sidt1:
   809 000005A5 AD                      	lodsd
   810 000005A6 89C2                    	mov	edx, eax
   811 000005A8 66BA008E                	mov	dx, 8E00h
   812 000005AC 6689C3                  	mov	bx, ax
   813 000005AF 89D8                    	mov	eax, ebx	; /* selector = 0x0008 = cs */
   814                                         			        ; /* interrupt gate - dpl=0, present */
   815 000005B1 AB                      	stosd	; selector & offset bits 0-15 	
   816 000005B2 89D0                    	mov	eax, edx
   817 000005B4 AB                      	stosd	; attributes & offset bits 16-23
   818 000005B5 E2EE                    	loop	rp_sidt1
   819                                  	; 15/04/2016
   820                                  	; TRDOS 386 (TRDOS v2.0) /// 32 sofware interrupts ///
   821                                  	;mov	cl, 16        ; 16 software interrupts (INT 30h to INT 3Fh)
   822 000005B7 B120                    	mov	cl, 32	      ; 32 software interrupts (INT 30h to INT 4Fh)	
   823                                  rp_sidt2:
   824 000005B9 AD                      	lodsd
   825 000005BA 21C0                    	and	eax, eax
   826 000005BC 7413                    	jz	short rp_sidt3
   827 000005BE 89C2                    	mov	edx, eax
   828 000005C0 66BA00EE                	mov	dx, 0EE00h	; P=1b/DPL=11b/01110b
   829 000005C4 6689C3                  	mov	bx, ax
   830 000005C7 89D8                    	mov	eax, ebx	; selector & offset bits 0-15 	
   831 000005C9 AB                      	stosd
   832 000005CA 89D0                    	mov	eax, edx
   833 000005CC AB                      	stosd
   834 000005CD E2EA                    	loop	rp_sidt2
   835 000005CF EB16                    	jmp	short sidt_OK
   836                                  rp_sidt3:
   837 000005D1 B8[750D0000]            	mov	eax, ignore_int
   838 000005D6 89C2                    	mov	edx, eax
   839 000005D8 66BA00EE                	mov	dx, 0EE00h	; P=1b/DPL=11b/01110b
   840 000005DC 6689C3                  	mov	bx, ax
   841 000005DF 89D8                    	mov	eax, ebx	; selector & offset bits 0-15 	
   842                                  rp_sidt4:
   843 000005E1 AB                      	stosd
   844 000005E2 92                      	xchg	eax, edx
   845 000005E3 AB                      	stosd
   846 000005E4 92                      	xchg	edx, eax
   847 000005E5 E2FA                    	loop	rp_sidt4
   848                                  sidt_OK: 
   849 000005E7 0F011D[5E6D0000]        	lidt 	[idtd]
   850                                  	;
   851                                  	; TSS descriptor setup ; 24/03/2015
   852 000005EE B8[28810100]            	mov	eax, task_state_segment
   853 000005F3 66A3[0A6D0000]          	mov	[gdt_tss0], ax
   854 000005F9 C1C010                  	rol	eax, 16
   855 000005FC A2[0C6D0000]            	mov	[gdt_tss1], al
   856 00000601 8825[0F6D0000]          	mov	[gdt_tss2], ah
   857 00000607 66C705[8E810100]68-     	mov	word [tss.IOPB], tss_end - task_state_segment
   857 0000060F 00                 
   858                                  		; 
   859                                  		; IO Map Base address (When this address points
   860                                  		; to end of the TSS, CPU does not use IO port 
   861                                  		; permission bit map for RING 3 IO permissions, 
   862                                  		; access to any IO ports in ring 3 will be forbidden.)
   863                                   		;
   864                                  	;mov	[tss.esp0], esp ; TSS offset 4
   865                                  	;mov	word [tss.ss0], KDATA ; TSS offset 8 (SS)
   866 00000610 66B82800                   	mov	ax, TSS  ; It is needed when an interrupt 
   867                                  			 ; occurs (or a system call -software INT- is requested)
   868                                  			 ; while cpu running in ring 3 (in user mode).				
   869                                  			 ; (Kernel stack pointer and segment will be loaded
   870                                  			 ; from offset 4 and 8 of the TSS, by the CPU.)	 
   871 00000614 0F00D8                  	ltr	ax  ; Load task register
   872                                  	;
   873                                  esp0_set0:
   874                                  	; 30/07/2015
   875 00000617 8B0D[94810100]          	mov 	ecx, [memory_size] ; memory size in pages
   876 0000061D C1E10C                  	shl 	ecx, 12 ; convert page count to byte count
   877 00000620 81F900004000            	cmp	ecx, CORE ; beginning of user's memory space (400000h)
   878                                  			  ; (kernel mode virtual address)
   879 00000626 7605                    	jna	short esp0_set1
   880                                  	;
   881                                  	; If available memory > CORE (end of the 1st 4 MB)
   882                                  	; set stack pointer to CORE
   883                                  	;(Because, PDE 0 is reserved for kernel space in user's page directory)
   884                                  	;(PDE 0 points to page table of the 1st 4 MB virtual address space)
   885 00000628 B900004000              	mov	ecx, CORE
   886                                  esp0_set1:
   887 0000062D 89CC                    	mov	esp, ecx ; top of kernel stack (**tss.esp0**)
   888                                  esp0_set_ok:
   889                                  	; 30/07/2015 (**tss.esp0**) 
   890 0000062F 8925[2C810100]          	mov	[tss.esp0], esp
   891 00000635 66C705[30810100]10-             mov     word [tss.ss0], KDATA
   891 0000063D 00                 
   892                                  	; 14/08/2015
   893                                  	; 10/11/2014 (Retro UNIX 386 v1 - Erdogan Tan)
   894                                  	;
   895                                  	;cli	; Disable interrupts (for CPU)
   896                                  	;    (CPU will not handle hardware interrupts, except NMI!)
   897                                  	;
   898 0000063E 30C0                    	xor	al, al		; Enable all hardware interrupts!
   899 00000640 E621                    	out	21h, al		; (IBM PC-AT compatibility)
   900 00000642 EB00                    	jmp 	$+2		; (All conventional PC-AT hardware
   901 00000644 E6A1                    	out	0A1h, al	;  interrupts will be in use.)	
   902                                  				; (Even if related hardware component
   903                                  				;  does not exist!)
   904                                  	; Enable NMI 
   905 00000646 B07F                    	mov	al, 7Fh		; Clear bit 7 to enable NMI (again)
   906 00000648 E670                    	out  	70h, al
   907                                  	; 23/02/2015
   908 0000064A 90                      	nop
   909 0000064B E471                    	in	al, 71h		; read in 71h just after writing out to 70h
   910                                  				; for preventing unknown state (!?)
   911                                  	;
   912                                  	; Only a NMI can occur here... (Before a 'STI' instruction)
   913                                  	;
   914                                  	; 02/09/2014
   915 0000064D 6631DB                  	xor	bx, bx
   916 00000650 66BA0002                	mov	dx, 0200h	; Row 2, column 0  ; 07/03/2015
   917 00000654 E83E1D0000              	call	_set_cpos	; 24/01/2016
   918                                  
   919                                  	; 14/11/2020 (TRDOS 386 v2.0.3)
   920                                  	; Check VBE3 protected mode interface/feature(s)
   921                                  
   922                                  	;cmp	byte [vbe3], 3 ; 03h
   923                                  	;jne	short display_mem_info
   924                                  
   925                                  	; 20/11/2020
   926 00000659 803D[54090000]02        	cmp	byte [vbe3], 2 ; 02h
   927 00000660 770B                    	ja	short vbe3_pmid_chk
   928                                  	;jb	short display_mem_info
   929 00000662 0F82C2010000            	jb	display_mem_info ; 02/12/2020
   930 00000668 E9F6010000              	jmp	check_boch_plex86_vbe
   931                                  vbe3_pmid_chk:	
   932 0000066D B9EA7F0000              	mov	ecx, 32768 - (20+2) ; 32766 - PMInfoBlockSize
   933 00000672 BE02000C00              	mov	esi, 0C0002h ; 1st word of the video bios rom is 0AA55h
   934                                  	
   935                                  chk_pmi_sign:
   936                                  	;mov	eax, [esi] 
   937                                  	;cmp	eax, 'PMID'
   938                                  	; 30/11/2020
   939                                  	;cmp	al, 'P'
   940                                  	;jne	short chk_pmi_sign_next
   941 00000677 813E504D4944            	cmp	dword [esi], 'PMID'
   942                                  	;je	short display_vbios_product_name
   943 0000067D 740E                    	je	short verify_pmib_chksum ; 15/11/2020
   944                                  ;chk_pmi_sign_next:
   945 0000067F 46                      	inc	esi  ; inc si
   946 00000680 E2F5                    	loop	chk_pmi_sign
   947                                  
   948                                  not_valid_pmib:
   949 00000682 FE0D[54090000]          	dec	byte [vbe3] ; 2 = VBE2 compatible 
   950                                  			    ; (vbe3 feature is defective in this vbios)
   951                                  	;jmp	short display_mem_info
   952                                  	; 02/12/2020
   953 00000688 E99D010000              	jmp	display_mem_info
   954                                  
   955                                  verify_pmib_chksum:
   956                                  	; 15/11/2020
   957 0000068D 31C0                    	xor	eax, eax
   958                                  	;mov	ecx, eax 
   959                                  	;mov	cl, 20
   960 0000068F 66B91400                	mov	cx, 20 ; 30/11/2020
   961 00000693 56                      	push	esi
   962                                  pmib_sum_bytes:
   963 00000694 AC                      	lodsb
   964 00000695 00C4                    	add	ah, al
   965 00000697 E2FB                    	loop	pmib_sum_bytes
   966 00000699 5E                      	pop	esi
   967 0000069A 08E4                    	or	ah, ah
   968 0000069C 75E4                    	jnz	short not_valid_pmib ; AH must be 0
   969                                  
   970                                  display_vbios_product_name: ; 14/11/2020
   971                                  
   972                                  	; ESI points to 'PMID' (0C0000h + 'PMID' offset)
   973                                  
   974                                  	; 15/11/2020
   975                                  	;mov	[pmid_addr], si	; PMInfoBlock offset
   976                                  	;		; (in VGA bios, 0C0000h + offset)
   977                                  	; 02/12/2020
   978                                  	;push	esi ; * pmid_addr
   979 0000069E 89F7                    	mov	edi, esi
   980                                  
   981                                  	;mov	esi, [VBE3INFOBLOCK+22] ; 097E00h + 16h
   982                                  	;		; OemVendorNamePtr (seg16:off16)
   983 000006A0 8B35067E0900            	mov	esi, [VBE3INFOBLOCK+6] ; 097E00h + 06h
   984                                  			; OemStringPtr (seg16:off16)
   985 000006A6 30C0                    	xor	al, al  ; eax = 0
   986 000006A8 6696                    	xchg	ax, si	; ax = offset, si = 0
   987 000006AA C1EE0C                  	shr	esi, 12 ; (to convert segment to base addr)
   988 000006AD 6601C6                  	add	si, ax  ; esi has an address < 1 MB limit
   989                                  			; (OemVendorName is in VBE3INFOBLOCK)
   990                                  			; Example: 
   991                                  			; TRDOS 386 v2.0.3 VESA VBE3 protected mode
   992                                  			; interface development reference is ...
   993                                  			; NVIDIA GeForce FX5500 VGA BIOS -C000h:029Ch-
   994                                  			; Version 4.34.20.54.00 -C000h:02EDh- 	  
   995                                  			; ((OemString is 'NVIDIA'))
   996                                  			; ((OemVendorName is 'NVIDIA Corporation'))
   997                                  			; ((OemProductName is 'NV34 Board - p162-1nz))
   998                                  
   999                                  	;mov	ah, 0Eh ; Black background, yellow forecolor
  1000                                  	; 30/11/2020
  1001 000006B0 B40C                    	mov	ah, 0Ch ; Black background, light red forecolor
  1002                                  
  1003 000006B2 E8D73B0000              	call	print_kmsg
  1004                                  
  1005                                  	;mov	ah, 07h
  1006                                  
  1007 000006B7 BE[397E0100]            	mov	esi, vesa_vbe3_bios_msg
  1008                                  	;call	print_kmsg
  1009 000006BC E8D33B0000              	call	pkmsg_loop ; 30/11/2020
  1010                                  
  1011                                  	; 02/12/2020
  1012                                  	;pop	edi ; * pmid_addr
  1013                                  
  1014                                  	; 30/11/2020
  1015                                  	; 29/11/2020 - TRDOS 386 v2.0.3
  1016                                  
  1017                                  struc PMInfo  ;  VESA VBE3 PMInfoBlock ('PMID' block)
  1018                                  
  1019 00000000 <res 00000004>           .Signature:	resb 4  ; db 'PMID' ; PM Info Block Signature
  1020 00000004 <res 00000002>           .EntryPoint:	resw 1	; Offset of PM entry point within BIOS
  1021 00000006 <res 00000002>           .PMInitialize: resw 1	; Offset of PM initialization entry point
  1022 00000008 <res 00000002>           .BIOSDataSel:	resw 1 	; Selector to BIOS data area emulation block
  1023 0000000A <res 00000002>           .A0000Sel:	resw 1	; Selector to access A0000h physical mem
  1024 0000000C <res 00000002>           .B0000Sel:	resw 1  ; Selector to access B0000h physical mem
  1025 0000000E <res 00000002>           .B8000Sel:	resw 1	; Selector to access B8000h physical mem
  1026 00000010 <res 00000002>           .CodeSegSel:	resw 1	; Selector to access code segment as data
  1027 00000012 <res 00000001>           .InProtectMode: resb 1 ; Set to 1 when in protected mode
  1028 00000013 <res 00000001>           .Checksum:	resb 1	; Checksum byte for structure
  1029                                   .size:
  1030                                  
  1031                                  endstruc
  1032                                  
  1033                                  	; 29/11/2020
  1034                                  vbe3pminit:
  1035                                  	; 30/11/2020
  1036                                  	;cmp	byte [vbe3], 3 ; is VESA VBE3 PMI ready ?
  1037                                  	;jne	short di4
  1038                                  
  1039                                  	; Allocate 64KB contiguous (kernel) memory block
  1040 000006C1 31C0                    	xor	eax, eax
  1041 000006C3 B900000100              	mov	ecx, 65536
  1042 000006C8 E8A65D0000              	call	allocate_memory_block
  1043                                  	;jc	short di4
  1044 000006CD 0F8250010000            	jc	di0 ; 30/11/2020
  1045                                  
  1046                                  	; of course this block must be in the 1st 16MB
  1047                                  	; because vbe3 pmi segments will be 16 bit segments
  1048                                  	; (80286 type segment descriptors in GDT)
  1049                                  
  1050 000006D3 A3[20120300]            	mov	[vbe3bios_addr], eax
  1051                                  
  1052                                  	; set [pmid_addr] to the new location
  1053 000006D8 BE00000C00              	mov	esi, 0C0000h
  1054                                  
  1055                                  	; 30/11/2020
  1056 000006DD 29F7                    	sub	edi, esi ; izolate offset
  1057 000006DF 01C7                    	add	edi, eax ; new address
  1058 000006E1 893D[24120300]          	mov	[pmid_addr], edi ; new 'PMID' location	
  1059                                  
  1060                                  	; Move VIDEO BIOS from 0C0000h to EAX
  1061 000006E7 B900400000              	mov	ecx, 65536/4
  1062 000006EC 89C7                    	mov	edi, eax ; 30/11/2020
  1063 000006EE F3A5                    	rep	movsd
  1064                                  
  1065                                  	; 02/12/2020
  1066                                  	; 30/11/2020
  1067                                  	; set vbe3 segment selectors
  1068                                  
  1069                                  	; VBE3CS (VESA VBE3 video bios code segment)
  1070 000006F0 BF[126D0000]            	mov	edi, _vbe3_CS+2 ; base address bits 0..15
  1071 000006F5 66AB                    	stosw	; edi = _vbe3_CS+4
  1072 000006F7 C1C810                  	ror	eax, 16
  1073 000006FA 8807                    	mov	[edi], al ; base address, bits 16..23
  1074                                  
  1075                                  	; VBE3DS ('CodeSegSel' in PMInfoBlock)
  1076 000006FC BF[3C6D0000]            	mov	edi, _vbe3_DS+4 ; base addr bits 16..23
  1077 00000701 8807                    	mov	[edi], al 
  1078 00000703 C1C010                  	rol	eax, 16
  1079 00000706 668947FE                	mov	[edi-2], ax ; base address, bits 0..15
  1080                                  
  1081                                  	; VBE3BDS (BIOSDataSel in PMInfoBlock)
  1082 0000070A BF[1A6D0000]            	mov	edi, _vbe3_BDS+2 ; base addr bits 0..15
  1083 0000070F B800700900              	mov	eax, VBE3BIOSDATABLOCK ; 1536 bytes
  1084 00000714 66AB                    	stosw	; edi = _vbe3_BDS+4
  1085 00000716 C1E810                  	shr	eax, 16
  1086 00000719 8807                    	mov	[edi], al ; base address, bits 16..23
  1087                                  
  1088                                  	; VBE3SS (1024 bytes)
  1089 0000071B BF[426D0000]            	mov	edi, _vbe3_SS+2 ; base addr bits 0..15
  1090 00000720 B800600900              	mov	eax, VBE3STACKADDR ; size = 1024 bytes
  1091 00000725 66AB                    	stosw	; edi = _vbe3_SS+4
  1092 00000727 C1E810                  	shr	eax, 16
  1093 0000072A 8807                    	mov	[edi], al ; base address, bits 16..23
  1094                                  
  1095                                  	; stack pointer (esp) will be set to 1020
  1096                                  	; (before VBE3 PMI call)
  1097                                  
  1098                                  	; VBE3ES (max: 2048 bytes)
  1099 0000072C BF[4A6D0000]            	mov	edi, _vbe3_ES+2 ; base addr bits 0..15
  1100 00000731 B800760900              	mov	eax, VBE3SAVERESTOREBLOCK
  1101 00000736 66AB                    	stosw	; edi = _vbe3_ES+4
  1102 00000738 C1E810                  	shr	eax, 16
  1103 0000073B 8807                    	mov	[edi], al ; base address, bits 16..23 	
  1104                                  
  1105                                  	;Note: low word of _VBE3_ES base address will be
  1106                                  	;      set -again- by VBE3 PMI caller routine 
  1107                                  
  1108                                  	; 09/12/2020
  1109                                  	;; set pmi32 (as VBE3 PMI is ready)
  1110                                  	;inc	byte [pmi32] ; = 1 
  1111                                  
  1112                                  	; KCODE16 (set PMI far return segment)
  1113 0000073D BF[526D0000]            	mov	edi, _16bit_CS+2 ; base addr bits 0..15
  1114 00000742 B8[CA070000]            	mov	eax, pminit_return_addr16
  1115 00000747 66AB                    	stosw	; edi = _16bit_CS+4
  1116 00000749 C1E810                  	shr	eax, 16
  1117 0000074C 8807                    	mov	[edi], al ; base address, bits 16..23 
  1118                                  
  1119                                  	; 30/11/2020
  1120                                  	; clear mem from VBE3 BIOS data area emu block
  1121                                  	; to end of vbe3 buffers
  1122                                  
  1123                                  	; 01/12/2020
  1124 0000074E BF00700900              	mov	edi, VBE3BIOSDATABLOCK ; 97000h
  1125                                  	;mov	cx, (VBE3INFOBLOCK-VBE3BIOSDATABLOCK)/4
  1126                                  	;	; ecx = 3584/4 double words
  1127                                  	; 21/12/2020
  1128 00000753 66B90003                	mov	cx, (VBE3MODEINFOBLOCK-VBE3BIOSDATABLOCK)/4
  1129                                  		; ecx = 3072/4 double words
  1130                                  	;xor	eax, eax
  1131 00000757 30C0                    	xor	al, al
  1132 00000759 F3AB                    	rep	stosd
  1133                                  
  1134                                  	; Filling PMInfoBlock selector fields
  1135 0000075B 8B3D[24120300]          	mov	edi, [pmid_addr]
  1136 00000761 66C747083800            	mov	word [edi+PMInfo.BIOSDataSel], VBE3BDS
  1137 00000767 66C7470A4000            	mov	word [edi+PMInfo.A0000Sel], VBE3A000
  1138 0000076D 66C7470C4800            	mov	word [edi+PMInfo.B0000Sel], VBE3B000
  1139 00000773 66C7470E5000            	mov	word [edi+PMInfo.B8000Sel], VBE3B800	
  1140 00000779 66C747105800            	mov	word [edi+PMInfo.CodeSegSel], VBE3DS
  1141 0000077F C6471201                	mov	byte [edi+PMInfo.InProtectMode], 1
  1142                                  
  1143                                  	; Calculate and write checksum byte
  1144 00000783 89FE                    	mov	esi, edi
  1145 00000785 B113                    	mov	cl, PMInfo.size - 1
  1146                                  	;xor	ah, ah
  1147                                  pmid_chksum:
  1148 00000787 AC                      	lodsb	
  1149 00000788 00C4                    	add	ah, al
  1150 0000078A E2FB                    	loop	pmid_chksum
  1151 0000078C F6DC                    	neg	ah ; 1 -> 255, 255 -> 1
  1152 0000078E 8826                    	mov	byte [esi], ah  ; checksum
  1153                                  
  1154                                  	; far call PM initialization
  1155                                  	; (VBE3 video bios will return via 'retf')
  1156                                  
  1157 00000790 668B4706                	mov	ax, [edi+PMInfo.PMInitialize]
  1158                                  	; 30/11/2020
  1159 00000794 C1E010                  	shl	eax, 16 ; save entry address in hw
  1160                                  	; ax = 0 
  1161                                  
  1162                                  	; 02/12/2020
  1163 00000797 68[EE070000]            	push	pminit_ok ; normal, near return address
  1164                                  
  1165                                  	; 30/11/2020
  1166                                  _VBE3PMI_fcall:
  1167                                  	; ax = function, hw of eax = entry address
  1168 0000079C 9C                      	pushf	; save 32 bit flags
  1169 0000079D 56                      	push	esi ; *
  1170 0000079E 55                      	push	ebp ; **
  1171                                  
  1172 0000079F 89E5                    	mov	ebp, esp ; save 32 bit stack pointer
  1173                                  	
  1174 000007A1 89C6                    	mov	esi, eax
  1175                                  
  1176 000007A3 FA                      	cli
  1177                                  
  1178                                  	; Disable interrupts (clear interrupt flag)
  1179                                  	; Reset Interrupt MASK Registers (Master&Slave)
  1180 000007A4 B0FF                    	mov	al, 0FFh	; mask off all interrupts
  1181 000007A6 E621                    	out	21h, al		; on master PIC (8259)
  1182 000007A8 EB00                    	jmp 	$+2  ; (delay)
  1183 000007AA E6A1                    	out	0A1h, al	; on slave PIC (8259)
  1184                                  
  1185                                  	; 02/12/2020
  1186 000007AC 66B86000                	mov	ax, VBE3SS
  1187 000007B0 8ED0                    	mov	ss, ax
  1188                                  	
  1189 000007B2 BCFC030000              	mov	esp, 1020 ; 30/11/2020
  1190                                  
  1191                                  	; 01/12/2020
  1192                                  	;lss	esp, [stack16]
  1193                                  
  1194 000007B7 C1E810                  	shr	eax, 16	; now, entry address is in lw
  1195                                  
  1196                                  	; 30/11/2020 - 16 bit pm selector test (OK)
  1197                                  	; (32 bit stack push/pop & retf with 32 bit code segment)
  1198                                  	; (16 bit stack push/pop with 16 bit code segment)
  1199                                  	
  1200                                  	; return
  1201                                  	;push	KCODE16
  1202                                  	;push	0 ; 30/11/2020 (pminit_return_addr16)
  1203                                  
  1204                                  	; 30/11/2020 (16 bit stack during retf from video bios)
  1205 000007BA C7042400007000          	mov	dword [esp], KCODE16 << 16
  1206                                  				; ip = 0, cs = KCODE16 
  1207                                  	; 01/12/2020
  1208                                  	;mov	dword [VBE3STACKADDR+1020], KCODE16*65536
  1209                                  
  1210                                  	;mov	[jumpfar16], eax
  1211                                  
  1212                                  	; 02/12/2020
  1213                                  	; 30/11/2020 (32 bit stack during retf from kernel)
  1214                                  	; far jump/call via retf
  1215 000007C1 6A30                    	push	VBE3CS ; VBE3 video bios's code segment
  1216 000007C3 50                      	push	eax ; PMInitialize or EntryPoint
  1217                                  
  1218 000007C4 6689F0                  	mov	ax, si ; restore function
  1219                                  	
  1220                                  	; 02/12/2020
  1221 000007C7 31F6                    	xor	esi, esi ; (not necessary, it is not used)
  1222                                  	
  1223 000007C9 CB                      	retf 	; far return (to 16 bit code segment)
  1224                                  
  1225                                  	; 01/12/2020
  1226                                  	;db	0EAh  ; far jump to 16 bit code segment
  1227                                  ;jumpfar16:
  1228                                  	;dd	0		
  1229                                  	;dw	VBE3CS
  1230                                  
  1231                                  ;stack16:
  1232                                  	;dd	1020
  1233                                  	;dw	VBE3SS
  1234                                  
  1235                                  	align 2	
  1236                                  
  1237                                  pminit_return_addr16:
  1238                                  	; 02/12/2020
  1239                                  	; 30/11/2020
  1240                                  	;;db	66h 		     ; Prefix for 32-bit
  1241                                  	;db	0EAh 		     ; Opcode for far jump
  1242                                  	;dd	pminit_return_addr32 ; 32 bit Offset
  1243                                  	;dw	KCODE		     ; 32 bit code segment
  1244                                  	; 01/12/2020
  1245 000007CA EA[D1070000]0800        	jmp	KCODE:pminit_return_addr32
  1246                                  
  1247                                  pminit_return_addr32:
  1248                                  	; restore 32 bit kernel selectors and 32 bit stack addr
  1249 000007D1 BE10000000              	mov	esi, KDATA
  1250 000007D6 8EDE                    	mov	ds, si
  1251 000007D8 8EC6                    	mov	es, si
  1252 000007DA 8ED6                    	mov	ss, si
  1253 000007DC 89EC                    	mov	esp, ebp  ; top of stack = iretd return addr
  1254                                  
  1255 000007DE 5D                      	pop	ebp ; **
  1256 000007DF 5E                      	pop	esi ; *
  1257 000007E0 9D                      	popf	; restore 32 bit flags
  1258                                  
  1259                                  	; enable interrupts
  1260                                  
  1261 000007E1 FA                      	cli
  1262                                  
  1263                                  	; 21/12/2020
  1264 000007E2 50                      	push	eax
  1265                                  
  1266 000007E3 30C0                    	xor	al, al	   ; Enable all hardware interrupts!
  1267 000007E5 E621                    	out	21h, al	   ; (IBM PC-AT compatibility)
  1268 000007E7 EB00                    	jmp 	$+2	   ; (All conventional PC-AT hardware
  1269 000007E9 E6A1                    	out	0A1h, al   ;  interrupts will be in use.)	
  1270                                  			   ; (Even if related hardware component
  1271                                  			   ;  does not exist!)
  1272 000007EB 58                      	pop	eax
  1273                                  	
  1274 000007EC FB                      	sti
  1275                                  
  1276                                  	; top of stack = return address 
  1277                                  	; ('pminit_ok' for PMinit)
  1278                                  
  1279 000007ED C3                      	retn
  1280                                  
  1281                                  pminit_ok:
  1282                                  	; 03/12/2020
  1283                                  	; (set [pmid_addr] to PMI entry point for next calls)
  1284 000007EE 8305[24120300]04        	add	dword [pmid_addr], PMInfo.EntryPoint ; + 4
  1285                                  
  1286                                  	; 17/01/2021
  1287                                  	; copy EDID data from temporary location to final address
  1288 000007F5 803D[25430000]4F        	cmp	byte [edid], 4Fh
  1289 000007FC 7511                    	jne	short vbe3h_chcl
  1290 000007FE B920000000              	mov	ecx, 32 ; 128 bytes, 32 dwords
  1291 00000803 BE007D0900              	mov	esi, VBE3EDIDINFOBLOCK ; 97D00h
  1292 00000808 BF[9C110300]            	mov	edi, edid_info
  1293 0000080D F3A5                    	rep	movsd
  1294                                  	; 17/01/2021
  1295                                  vbe3h_chcl:
  1296                                  	; 16/01/2021
  1297                                  	;; 06/12/2020
  1298                                  	;; Save video mode 03h regs/dac/bios state
  1299                                  	;
  1300                                  	;mov	ax, 4F04h ; VESA VBE Function 04h
  1301                                  	;		  ; Save/Restore State
  1302                                  	;sub	dl, dl	; 0 = return buffer size
  1303                                  	;mov	cx, 0Fh  ; ctrl/bios/dac/regs
  1304                                  	;
  1305                                  	;call	int10h_32bit_pmi
  1306                                   	;; bx = number of 64-byte blocks to hold the state buff
  1307                                  	;	
  1308                                  	;;mov	[vbe3stbufsize], bx
  1309                                  	;; 16/01/2021
  1310                                  	;or	word [vbe3stbsflags], 32768  ; set bit 15
  1311                                  	;mov	ax, bx
  1312                                  	;shl	ax, 6  ; * 64
  1313                                  	;mov	[vbestatebufsize+30], ax
  1314                                  	;
  1315                                  	;; 06/12/2020	
  1316                                  	;; check 'vbe3stbufsize' (it must be <= 32)
  1317                                  	;
  1318                                  	;cmp	bx, 32
  1319                                  	;ja	short display_mem_info ; light red forecolor
  1320                                  	;
  1321                                  	;; 16/01/2021
  1322                                  	;or	byte [vbe3stbsflags], 1 ; set bit 0
  1323                                  
  1324                                  	; 30/11/2020
  1325                                  	; Change VESA VBE3 BIOS text color in order to give
  1326                                  	; "VBE3 PMI initialization has been successed" meaning 	
  1327                                  
  1328 0000080F BE40810B00              	mov	esi, 0B8000h + 160*2 ; row 2
  1329 00000814 89F7                    	mov	edi, esi
  1330                                  vbe3h_chcl_next:
  1331 00000816 66AD                    	lodsw
  1332 00000818 80FC0C                  	cmp	ah, 0Ch	; light red forecolor
  1333 0000081B 750D                    	jne	short display_mem_info
  1334 0000081D B40E                    	mov	ah, 0Eh ; yellow forecolor
  1335 0000081F 66AB                    	stosw
  1336 00000821 EBF3                    	jmp	short vbe3h_chcl_next
  1337                                  
  1338                                  di0:
  1339                                  	; 30/11/2020
  1340                                  	; Memory allocation error !
  1341 00000823 C605[54090000]00        	mov	byte [vbe3], 0 ; disable VBE3
  1342                                  
  1343                                  display_mem_info:
  1344                                  	; 19/12/2020
  1345                                  	; temporary
  1346 0000082A E87B3A0000              	call	default_lfb_info
  1347                                  	;
  1348                                  	; 06/11/2014
  1349 0000082F E8013A0000              	call	memory_info
  1350                                  	; 14/08/2015
  1351                                  	;call getch ; 28/02/2015
  1352                                  drv_init:
  1353 00000834 FB                      	sti	; Enable Interrupts 
  1354                                  	; 06/02/2015
  1355 00000835 8B15[F06D0000]          	mov	edx, [hd0_type] ; hd0, hd1, hd2, hd3
  1356 0000083B 668B1D[EE6D0000]        	mov	bx, [fd0_type] ; fd0, fd1
  1357                                  	; 22/02/2015
  1358 00000842 6621DB                  	and	bx, bx
  1359 00000845 756C                    	jnz	short di1
  1360                                  	;
  1361 00000847 09D2                    	or 	edx, edx
  1362 00000849 757A                    	jnz	short di2
  1363                                  	;
  1364                                  setup_error:
  1365 0000084B BE[A6440100]            	mov 	esi, setup_error_msg
  1366                                  psem:	
  1367 00000850 AC                      	lodsb
  1368 00000851 08C0                    	or	al, al
  1369                                  	;jz	short haltx ; 22/02/2015
  1370 00000853 747B                    	jz	short di3
  1371 00000855 56                      	push	esi
  1372                                  	; 13/05/2016
  1373 00000856 BB07000000              	mov	ebx, 7	; Black background, 
  1374                                  			; light gray forecolor
  1375                                  			; Video page 0 (BH=0)
  1376 0000085B E89D1A0000              	call	_write_tty
  1377 00000860 5E                      	pop	esi
  1378 00000861 EBED                    	jmp	short psem
  1379                                  
  1380                                  check_boch_plex86_vbe:
  1381                                  	; 20/11/2020
  1382                                  	; check Bochs/Plex86 VGABios VBE extension
  1383                                  	; (check if TRDOS 386 v2 is running on emulators)
  1384                                  	; BOCHS/QEMU/VIRTUALBOX
  1385                                  	;
  1386                                  	; ref: vbe_display_api.txt
  1387                                  
  1388                                  	; bochs/plex86 VGAbios VBE source code
  1389                                  	;  by Jeroen Janssen (2002)
  1390                                  	;  and Volker Ruppert (2003-2020)
  1391                                  
  1392 00000863 29C0                    	sub	eax, eax ; 0
  1393 00000865 66BACE01                	mov	dx, 1CEh ; VBE_DISPI_IOPORT_INDEX
  1394 00000869 66EF                    	out	dx, ax ; VBE_DISPI_INDEX_ID register
  1395                                  	;mov	ax, 0B0C0h ; VBE_DISPI_ID0
  1396                                  	;mov	dx, 1CFh ; VBE_DISPI_IOPORT_DATA
  1397 0000086B 6642                    	inc	dx
  1398                                  	;out	dx, ax
  1399                                  	;nop
  1400 0000086D 66ED                    	in	ax, dx
  1401 0000086F 80FCB0                  	cmp	ah, 0B0h
  1402                                  	;jne	short not_boch_qemu_vbe
  1403 00000872 75B6                    	jne	short display_mem_info
  1404 00000874 3CC5                    	cmp	al, 0C5h ; it must be 0B0C4h or 0B0C5h ..
  1405                                  	;ja	short not_boch_qemu_vbe
  1406 00000876 77B2                    	ja	short display_mem_info
  1407 00000878 3CC0                    	cmp	al, 0C0h ; 0B0C0h to 0B0C5h .. ; Qemu
  1408                                  	;cmp	al, 0C4h ; 0BC04h or 0B0C5h is OK ; Bochs
  1409                                  	;jb	short not_boch_qemu_vbe
  1410 0000087A 72AE                    	jb	short display_mem_info
  1411                                  
  1412                                  	; save VESA VBE2 bios (bochs/qemu) signature
  1413                                  	; for enabling VBE2 functions in TRDOS 386 v2 kernel
  1414 0000087C A2[55090000]            	mov	[vbe2bios], al ; 0C4h or 0C5h (for BOCHS) 
  1415                                  			       ; (0C0h-0C5h for QEMU)
  1416 00000881 C605[427E0100]32        	mov	byte [vbe_vnumber], "2"
  1417                                  	; 26/11/2020
  1418                                  	; "BOCHS/QEMU/VIRTUALBOX VBE2 Video BIOS ..".
  1419 00000888 BE[247E0100]            	mov	esi, vbe2_bochs_vbios ; BOCH/QEMU vbios msg
  1420 0000088D B40E                    	mov	ah, 0Eh  ; Yellow font
  1421 0000088F E8FA390000              	call	print_kmsg
  1422                                  	
  1423                                  	; this is not necessary ! (20/11/2020)
  1424 00000894 803D[55090000]C4        	cmp	byte [vbe2bios], 0C4h 
  1425 0000089B 728D                    	jb	display_mem_info	; (QEMU) 
  1426                                  
  1427                                  	; Display kernel version message if 0E9h hack port
  1428                                  	; is enabled (bochs emulator feature)
  1429 0000089D 66BAE900                	mov	dx, 0E9h ; hack port for BOCHS
  1430 000008A1 BE[7D7E0100]            	mov	esi, kernel_version_msg
  1431                                  kvmsg_next_char:
  1432 000008A6 AC                      	lodsb	
  1433 000008A7 08C0                    	or	al, al
  1434 000008A9 7505                    	jnz	short put_kvmsg_in_hack_port
  1435                                  not_boch_qemu_vbe:
  1436 000008AB E97AFFFFFF               	jmp	display_mem_info
  1437                                  put_kvmsg_in_hack_port:	
  1438 000008B0 EE                      	out	dx, al
  1439 000008B1 EBF3                    	jmp	short kvmsg_next_char
  1440                                  
  1441                                  di1:
  1442                                  	; supress 'jmp short T6'
  1443                                  	;  (activate fdc motor control code)
  1444 000008B3 66C705[B6090000]90-     	mov	word [T5], 9090h ; nop
  1444 000008BB 90                 
  1445                                  	;
  1446                                  	;mov	ax, int_0Eh	; IRQ 6 handler
  1447                                  	;mov	di, 0Eh*4	; IRQ 6 vector
  1448                                  	;stosw
  1449                                  	;mov 	ax, cs
  1450                                  	;stosw
  1451                                  	;; 16/02/2015
  1452                                          ;;mov     dword [DISKETTE_INT], fdc_int ; IRQ 6 handler
  1453                                  	;
  1454 000008BC E820490000              	CALL	DSKETTE_SETUP	; Initialize Floppy Disks
  1455                                  	;
  1456 000008C1 09D2                    	or	edx, edx
  1457 000008C3 740B                            jz      short di3
  1458                                  di2:
  1459 000008C5 E85E490000              	call   	DISK_SETUP	; Initialize Fixed Disks
  1460 000008CA 0F827BFFFFFF                    jc      setup_error
  1461                                  di3:
  1462 000008D0 E834390000              	call	setup_rtc_int	; 22/05/2015 (dsectrpm.s)
  1463                                  	;
  1464 000008D5 E8623A0100              	call	display_disks ; 07/03/2015  (Temporary)
  1465                                  ;haltx:
  1466                                  	; 14/08/2015
  1467                                  	;call	getch ; 22/02/2015
  1468                                  	;sti	; Enable interrupts (for CPU)
  1469                                  ;	; 29/01/2016
  1470                                  ;	sub	ah, ah ;  read time count
  1471                                  ;	call	int1Ah
  1472                                  ;	mov	edx, ecx ; 18.2 * seconds
  1473                                  ;md_info_msg_wait1:
  1474                                  ;	; 29/01/2016
  1475                                  ;	mov	ah, 1
  1476                                  ;	call	int16h
  1477                                  ;	jz	short md_info_msg_wait2
  1478                                  ;	xor	ah, ah ; 0
  1479                                  ;       call    int16h
  1480                                  ;	jmp 	short md_info_msg_ok
  1481                                  ;md_info_msg_wait2:
  1482                                  ;	sub	ah, ah  ; read time count
  1483                                  ;	call	int1Ah
  1484                                  ;	cmp	edx, ecx ; ; 18.2 * seconds
  1485                                  ;	jna	short md_info_msg_wait3
  1486                                  ;	xchg 	edx, ecx	
  1487                                  ;md_info_msg_wait3:
  1488                                  ;	sub	ecx, edx
  1489                                  ;	cmp	ecx, 127 ; 7 seconds (18.2 * 7)
  1490                                  ;	jb	short md_info_msg_wait1		
  1491                                  ;md_info_msg_ok:
  1492                                  
  1493                                  	; 15/12/2020
  1494                                  	; set initial values of LFB parameters
  1495                                  
  1496 000008DA 803D[54090000]02        	cmp	byte [vbe3], 2
  1497 000008E1 7214                    	jb	short di4
  1498                                  
  1499                                  	;mov	ax, [def_LFB_addr]
  1500                                  	;shl	eax, 16
  1501                                  	;mov	[LFB_ADDR], eax
  1502                                  	;mov	eax, 1024*768*3
  1503                                  	;mov	[LFB_SIZE], eax
  1504                                  
  1505 000008E3 BEFE7B0900              	mov	esi, VBE3MODEINFOBLOCK - 2
  1506 000008E8 66C7061801              	mov	word [esi], 0118h ; default vbe mode
  1507                                  				  ; 1024*768, 24bpp
  1508 000008ED E8A3310000              	call	set_lfbinfo_table
  1509                                  
  1510 000008F2 E8D2600000              	call	allocate_lfb_pages_for_kernel
  1511                                  di4:
  1512                                  	; 08/09/2016
  1513 000008F7 0F20C0                  	mov	eax, cr0
  1514 000008FA A810                    	test	al, 10h  ; Bit 4, ET (Extension Type)
  1515 000008FC 7408                    	jz	short sysinit
  1516                                  	; 27/02/2017
  1517 000008FE FE05[4C8E0100]          	inc	byte [fpready]
  1518                                  	; 80387 (FPU) is ready
  1519 00000904 DBE3                    	fninit ; Initialize Floating-Point Unit
  1520                                  sysinit:
  1521                                  	; 30/06/2015
  1522 00000906 E81B6B0000              	call	sys_init
  1523                                  	;
  1524                                  	;jmp 	cpu_reset ; 22/02/2015
  1525                                  hang:  
  1526                                  	; 23/02/2015
  1527                                  	;sti			; Enable interrupts
  1528 0000090B F4                      	hlt
  1529                                  	;
  1530                                  	;nop
  1531                                  	;; 03/12/2014
  1532                                  	;; 28/08/2014
  1533                                  	;mov	ah, 11h
  1534                                  	;call	getc
  1535                                  	;jz      _c8
  1536                                  	;
  1537                                  	; 23/02/2015
  1538                                  	; 06/02/2015
  1539                                  	; 07/09/2014
  1540 0000090C 31DB                    	xor	ebx, ebx
  1541 0000090E 8A1D[BE810100]          	mov	bl, [ptty]	; active_page
  1542 00000914 89DE                    	mov	esi, ebx
  1543 00000916 66D1E6                  	shl 	si, 1
  1544 00000919 81C6[C0810100]          	add	esi, ttychr
  1545 0000091F 668B06                  	mov	ax, [esi]
  1546 00000922 6621C0                  	and	ax, ax
  1547                                  	;jz	short _c8
  1548 00000925 74E4                    	jz	short hang
  1549 00000927 66C7060000              	mov	word [esi], 0
  1550 0000092C 80FB03                  	cmp	bl, 3		; Video page 3
  1551                                  	;jb	short _c8
  1552 0000092F 72DA                    	jb	short hang
  1553                                  	;	
  1554                                  	; 13/05/2016
  1555                                  	; 07/09/2014
  1556                                  nxtl:
  1557 00000931 6653                    	push	bx
  1558 00000933 66BB0E00                	mov	bx, 0Eh 	; Yellow character 
  1559                                  				; on black background
  1560                                  				; bh = 0 (video page 0)
  1561                                  				; Retro UNIX 386 v1 - Video Mode 0
  1562                                  				; (PC/AT Video Mode 3 - 80x25 Alpha.)
  1563 00000937 6650                    	push	ax
  1564 00000939 E8BF190000              	call 	_write_tty
  1565 0000093E 6658                    	pop	ax
  1566 00000940 665B                    	pop	bx
  1567 00000942 3C0D                    	cmp	al, 0Dh		; carriage return (enter)
  1568                                  	;jne	short _c8
  1569 00000944 75C5                    	jne	short hang
  1570 00000946 B00A                    	mov	al, 0Ah		; next line
  1571 00000948 EBE7                    	jmp	short nxtl
  1572                                  	
  1573                                  ;_c8:
  1574                                  ;	; 25/08/2014
  1575                                  ;	cli				; Disable interrupts
  1576                                  ;	mov	al, [scounter + 1]
  1577                                  ;	and	al, al
  1578                                  ;	jnz	hang
  1579                                  ;	call	rtc_p
  1580                                  ;	jmp     hang
  1581                                  
  1582                                  	; 27/08/2014
  1583                                  	; 20/08/2014
  1584                                  printk:
  1585                                          ;mov    edi, [scr_row]
  1586                                  pkl:
  1587 0000094A AC                      	lodsb
  1588 0000094B 08C0                    	or 	al, al
  1589 0000094D 7404                    	jz	short pkr
  1590 0000094F 66AB                    	stosw
  1591 00000951 EBF7                    	jmp	short pkl
  1592                                  pkr:
  1593 00000953 C3                      	retn
  1594                                  
  1595                                  ; 14/11/2020 (TRDOS 386 v2.0.3)
  1596 00000954 00                      vbe3:	db 0  ; VESA VBE version (must be 03h)
  1597                                  	      ; for using video bios calls in protected mode
  1598                                  vbe2bios:
  1599 00000955 B0                      	db 0B0h ; 
  1600                                  ;pmid_addr: 		
  1601                                  	;dw 0  ; > 0 if 'PMID' sign is found 
  1602                                  	;     ;	('pmid' offset addr in VGA bios seg, 0C000h)
  1603                                  	;; 02/12/2020
  1604                                  	;dw 0	; 32 bit address in pmid_addr
  1605                                  		
  1606                                  ; 28/02/2017
  1607                                  ; 22/01/2017
  1608                                  ; 15/01/2017
  1609                                  ; 14/01/2017
  1610                                  ; 02/01/2017
  1611                                  ; 25/12/2016
  1612                                  ; 19/12/2016
  1613                                  ; 10/12/2016 (callback)
  1614                                  ; 06/06/2016
  1615                                  ; 23/05/2016
  1616                                  ; 22/05/2016 - TRDOS 386 (TRDOS v2.0) Timer Event Modifications
  1617                                  ; 25/07/2015
  1618                                  ; 14/05/2015 (multi tasking -time sharing- 'clock', x_timer)
  1619                                  ; 17/02/2015
  1620                                  ; 06/02/2015 (unix386.s)
  1621                                  ; 11/12/2014 - 22/12/2014 (dsectrm2.s) 
  1622                                  ;
  1623                                  ; IBM PC-XT Model 286 Source Code - BIOS2.ASM (06/10/85)
  1624                                  ;
  1625                                  ;-- HARDWARE INT  08 H - ( IRQ LEVEL 0 ) ---------------------------------------
  1626                                  ;	THIS ROUTINE HANDLES THE TIMER INTERRUPT FROM FROM CHANNEL 0 OF        :
  1627                                  ;	THE 8254 TIMER.  INPUT FREQUENCY IS 1.19318 MHZ AND THE DIVISOR        :
  1628                                  ;	IS 65536, RESULTING IN APPROXIMATELY 18.2 INTERRUPTS EVERY SECOND.     :
  1629                                  ;									       :
  1630                                  ;	THE INTERRUPT HANDLER MAINTAINS A COUNT (40:6C) OF INTERRUPTS SINCE    :
  1631                                  ;	POWER ON TIME, WHICH MAY BE USED TO ESTABLISH TIME OF DAY.	       :
  1632                                  ;	THE INTERRUPT HANDLER ALSO DECREMENTS THE MOTOR CONTROL COUNT (40:40)  :
  1633                                  ;	OF THE DISKETTE, AND WHEN IT EXPIRES, WILL TURN OFF THE 	       :
  1634                                  ;	DISKETTE MOTOR(s), AND RESET THE MOTOR RUNNING FLAGS.		       :
  1635                                  ;	THE INTERRUPT HANDLER WILL ALSO INVOKE A USER ROUTINE THROUGH	       :
  1636                                  ;	INTERRUPT 1CH AT EVERY TIME TICK.  THE USER MUST CODE A 	       :
  1637                                  ;	ROUTINE AND PLACE THE CORRECT ADDRESS IN THE VECTOR TABLE.	       :
  1638                                  ;-------------------------------------------------------------------------------
  1639                                  ;
  1640                                  
  1641                                  timer_int:	; IRQ 0
  1642                                  ;int_08h:	; Timer
  1643                                  	; 14/10/2015
  1644                                  	; Here, we are simulating system call entry (for task switch)
  1645                                  	; (If multitasking is enabled, 
  1646                                  	; 'clock' procedure may jump to 'sysrelease')
  1647                                  
  1648 00000956 1E                      	push	ds
  1649 00000957 06                      	push	es
  1650 00000958 0FA0                    	push	fs
  1651 0000095A 0FA8                    	push	gs
  1652                                  
  1653 0000095C 60                      	pushad	; eax, ecx, edx, ebx, esp -before pushad-, ebp, esi, edi
  1654 0000095D 66B91000                	mov     cx, KDATA
  1655 00000961 8ED9                            mov     ds, cx
  1656 00000963 8EC1                            mov     es, cx
  1657 00000965 8EE1                            mov     fs, cx
  1658 00000967 8EE9                            mov     gs, cx
  1659                                  
  1660 00000969 0F20D9                  	mov	ecx, cr3
  1661 0000096C 890D[5C040300]          	mov	[cr3reg], ecx ; save current cr3 register value/content
  1662                                  
  1663                                  	; 14/01/2017
  1664 00000972 3B0D[90810100]          	cmp 	ecx, [k_page_dir]
  1665 00000978 7409                    	je	short T3
  1666                                  
  1667 0000097A 8B0D[90810100]          	mov	ecx, [k_page_dir]
  1668 00000980 0F22D9                  	mov	cr3, ecx
  1669                                  T3:
  1670                                  	;sti				; INTERRUPTS BACK ON
  1671 00000983 66FF05[10820100]        	INC	word [TIMER_LOW]	; INCREMENT TIME
  1672 0000098A 7507                    	JNZ	short T4		; GO TO TEST_DAY
  1673 0000098C 66FF05[12820100]        	INC	word [TIMER_HIGH]	; INCREMENT HIGH WORD OF TIME
  1674                                  T4:					; TEST_DAY
  1675 00000993 66833D[12820100]18      	CMP	word [TIMER_HIGH],018H	; TEST FOR COUNT EQUALING 24 HOURS
  1676 0000099B 7519                    	JNZ	short T5		; GO TO DISKETTE_CTL
  1677 0000099D 66813D[10820100]B0-     	CMP	word [TIMER_LOW],0B0H
  1677 000009A5 00                 
  1678 000009A6 750E                    	JNZ	short T5		; GO TO DISKETTE_CTL
  1679                                  
  1680                                  ;-----	TIMER HAS GONE 24 HOURS
  1681                                  	;;SUB	AX,AX
  1682                                  	;MOV	[TIMER_HIGH],AX
  1683                                  	;MOV	[TIMER_LOW],AX
  1684 000009A8 29C0                    	sub	eax, eax
  1685 000009AA A3[10820100]            	mov	[TIMER_LH], eax
  1686                                  	;	
  1687 000009AF C605[14820100]01        	MOV	byte [TIMER_OFL],1
  1688                                  
  1689                                  ;-----	TEST FOR DISKETTE TIME OUT
  1690                                  
  1691                                  T5:
  1692                                  	; 23/12/2014
  1693 000009B6 EB1D                    	jmp	short T6		; will be replaced with nop, nop
  1694                                  					; (9090h) if a floppy disk
  1695                                  					; is detected.
  1696                                  	;mov	al,[CS:MOTOR_COUNT]
  1697 000009B8 A0[17820100]            	mov	al, [MOTOR_COUNT]
  1698 000009BD FEC8                    	dec	al
  1699                                  	;mov	[CS:MOTOR_COUNT], al	; DECREMENT DISKETTE MOTOR CONTROL
  1700 000009BF A2[17820100]            	mov	[MOTOR_COUNT], al
  1701                                  	;mov	[ORG_MOTOR_COUNT], al
  1702 000009C4 750F                    	JNZ	short T6		; RETURN IF COUNT NOT OUT
  1703 000009C6 B0F0                    	mov 	al,0F0h
  1704                                  	;AND	[CS:MOTOR_STATUS],al 	; TURN OFF MOTOR RUNNING BITS
  1705 000009C8 2005[16820100]          	and	[MOTOR_STATUS], al
  1706                                  	;and	[ORG_MOTOR_STATUS], al
  1707 000009CE B00C                    	MOV	AL,0CH			; bit 3 = enable IRQ & DMA, 
  1708                                  					; bit 2 = enable controller
  1709                                  					;	1 = normal operation
  1710                                  					;	0 = reset	
  1711                                  					; bit 0, 1 = drive select
  1712                                  					; bit 4-7 = motor running bits 
  1713 000009D0 66BAF203                	MOV	DX,03F2H		; FDC CTL PORT
  1714 000009D4 EE                      	OUT	DX,AL			; TURN OFF THE MOTOR
  1715                                  T6:	
  1716                                  	;inc	word [CS:wait_count]	; 22/12/2014 (byte -> word)
  1717                                  					; TIMER TICK INTERRUPT
  1718                                  	;;inc	word [wait_count] ;;27/02/2015
  1719                                  	;INT	1CH			; TRANSFER CONTROL TO A USER ROUTINE
  1720                                  	;cli
  1721 000009D5 E857040000              	call 	u_timer			; TRANSFER CONTROL TO A USER ROUTINE
  1722                                  	; 23/05/2016
  1723 000009DA E89D1A0100              	call	clock			; Multi Tasking control procedure
  1724                                  T7:
  1725                                  	; 14/10/2015
  1726 000009DF B020                    	MOV	AL,EOI			; GET END OF INTERRUPT MASK
  1727 000009E1 FA                      	CLI				; DISABLE INTERRUPTS TILL STACK CLEARED
  1728 000009E2 E620                    	OUT	INTA00,AL		; END OF INTERRUPT TO 8259 - 1	
  1729                                  	;
  1730                                  rtc_int_2:
  1731                                  	; 26/12/2016
  1732                                  	;mov	ecx, [cr3reg]
  1733                                  	; 13/01/2017
  1734 000009E4 803D[D4030300]00        	cmp	byte [u.t_lock], 0  	; T_LOCK
  1735 000009EB 7730                    	ja	short timer_int_return  ; Timer Lock : 'sysrele' is needed !
  1736                                  	; 28/02/2017
  1737                                  	; We need to exit if the user's IRQ callback service is in progress!
  1738                                  	; (To prevent a conflict!)
  1739 000009ED 803D[D8030300]00        	cmp	byte [u.r_lock], 0	; R_LOCK, IRQ callback service lock !
  1740 000009F4 7727                    	ja	short timer_int_return  ; Timer Lock : 'sysrele' is needed !	
  1741                                  	; 15/01/2017
  1742 000009F6 803D[208E0100]02        	cmp	byte [priority], 2
  1743 000009FD 733A                    	jnb	short T8  ; current process has a timer event (15/01/2017)
  1744                                  	; 22/05/2016
  1745 000009FF 803D[218E0100]00        	cmp	byte [p_change], 0 ; in 'set_run_sequence', in 'rtc_p'
  1746 00000A06 7615                    	jna	short timer_int_return ; 23/05/2016
  1747                                  
  1748                                  	; 15/01/2017
  1749                                  	
  1750                                  	; present process must be changed with high priority process	
  1751                                  	;xor	al, al
  1752 00000A08 31C0                    	xor	eax, eax ; 26/12/2016
  1753 00000A0A A2[218E0100]            	mov	[p_change], al ; 0
  1754                                  	;mov	byte [priority], 2 ; 15/01/2017 (there is a timer event)
  1755                                  
  1756 00000A0F 803D[5B030300]FF        	cmp     byte [sysflg], 0FFh ; user or system space ?
  1757 00000A16 7416                    	je	short rtc_int_3     ; user space ([sysflg]= 0FFh)
  1758                                  
  1759                                  	; system space, wait for 'sysret'
  1760                                  	; to change running process 	
  1761                                  	; with high priority (event) process
  1762                                  
  1763 00000A18 A2[A8030300]            	mov	[u.quant], al ; 0
  1764                                  
  1765                                  timer_int_return: ; 23/05/2016 - jump from 'rtc_int' ('rtc_int_2')
  1766 00000A1D 8B0D[5C040300]          	mov 	ecx, [cr3reg] 	; previous value/content of cr3 register
  1767 00000A23 0F22D9                   	mov	cr3, ecx	; restore cr3 register content
  1768                                  	;
  1769 00000A26 61                      	popad ; edi, esi, ebp, temp (icrement esp by 4), ebx, edx, ecx, eax
  1770                                  	;
  1771 00000A27 0FA9                    	pop	gs
  1772 00000A29 0FA1                    	pop	fs
  1773 00000A2B 07                      	pop	es
  1774 00000A2C 1F                      	pop	ds
  1775                                  	;
  1776 00000A2D CF                      	iretd	; return from interrupt
  1777                                  
  1778                                  rtc_int_3:
  1779 00000A2E FE05[5B030300]          	inc	byte [sysflg] 	; now, we are in system space
  1780                                  	;
  1781 00000A34 E9D3CE0000                      jmp     sysrelease ; change running process immediatelly 
  1782                                  
  1783                                  T8:
  1784                                  	; 13/01/2017 (eax -> ebx)
  1785                                  	; callback checking... (19/12/2016)
  1786 00000A39 31DB                    	xor	ebx, ebx
  1787 00000A3B 871D[D0030300]          	xchg	ebx, [u.tcb] ; callback address (0 = normal return)
  1788 00000A41 09DB                    	or	ebx, ebx
  1789 00000A43 74D8                    	jz	short timer_int_return
  1790                                  
  1791                                  	; Set user's callback routine as return address from this interrupt
  1792                                  	; and set normal return address as return address from callback
  1793                                  	; routine!!! (19/12/2016)
  1794                                  	
  1795                                  	; 14/01/2017
  1796                                  	; 13/01/2017 - Timer Lock (T_LOCK)
  1797 00000A45 FE05[D4030300]          	inc	byte [u.t_lock]
  1798 00000A4B 8A0D[5B030300]          	mov	cl, [sysflg]
  1799 00000A51 880D[D5030300]          	mov	[u.t_mode], cl 
  1800                                  
  1801 00000A57 8B2D[2C810100]          	mov	ebp, [tss.esp0] ; kernel stack address (for ring 0)
  1802 00000A5D 83ED14                  	sub	ebp, 20		; eip, cs, eflags, esp, ss
  1803 00000A60 892D[5C030300]           	mov	[u.sp], ebp
  1804 00000A66 8925[60030300]          	mov	[u.usp], esp
  1805                                  
  1806                                  	;or	word [ebp+8], 200h ; 22/01/2017, force enabling interrupts
  1807                                  
  1808 00000A6C 8B44241C                	mov	eax, [esp+28] ; pushed eax
  1809 00000A70 A3[64030300]            	mov	[u.r0], eax
  1810                                  
  1811 00000A75 E8FE060100              	call	wswap ; save user's registers & status
  1812                                  
  1813                                  	; software int is in ring 0 but timer int must return to ring 3
  1814                                  	; so, ring 3 return address and stack registers
  1815                                  	; (eip, cs, eflags, esp, ss) 
  1816                                  	; must be copied to timer int return
  1817                                  	; eip will be replaced by callback service routine address
  1818                                  
  1819 00000A7A C605[5B030300]FF        	mov	byte [sysflg], 0FFh ; user mode
  1820                                  
  1821                                  	; system mode (system call)
  1822                                  	;mov	ebp, [u.sp] ; EIP (u), CS (UCODE), EFLAGS (u),
  1823                                  			    ; ESP (u), SS (UDATA)
  1824                                  
  1825 00000A81 8B4510                  	mov	eax, [ebp+16]	; SS (UDATA
  1826 00000A84 89E6                    	mov	esi, esp
  1827 00000A86 50                      	push	eax
  1828 00000A87 50                      	push	eax
  1829 00000A88 89E7                    	mov	edi, esp
  1830 00000A8A 893D[60030300]          	mov	[u.usp], edi
  1831 00000A90 B908000000              	mov	ecx, ((ESPACE/4) - 4) ; except DS, ES, FS, GS
  1832 00000A95 F3A5                    	rep	movsd
  1833 00000A97 B104                    	mov	cl, 4	
  1834 00000A99 F3AB                    	rep	stosd
  1835 00000A9B 893D[5C030300]          	mov	[u.sp], edi
  1836 00000AA1 89EE                    	mov	esi, ebp
  1837 00000AA3 B105                    	mov	cl, 5 ; EIP (u), CS (UCODE), EFLAGS (u), ESP (u), SS (UDATA)
  1838 00000AA5 F3A5                    	rep	movsd
  1839                                  
  1840 00000AA7 8B0D[B8030300]          	mov	ecx, [u.pgdir]
  1841 00000AAD 890D[5C040300]          	mov	[cr3reg], ecx
  1842                                  
  1843                                  	; 13/01/207 (eax -> ebx)
  1844                                  	; EBX = callback routine address (virtual, not physical address!)
  1845                                  
  1846                                  	; 09/01/2017
  1847                                  	; !!! CALLBACK ROUTINE MUST BE ENDED/RETURNED WITH 'sysrele'
  1848                                  	;     system call !!!	
  1849                                  	; 25/12/2016
  1850                                  	; Callback Note: (19/12/2016)
  1851                                  	; !!! CALLBACK ROUTINE MUST BE ENDED/RETURNED WITH 'RETN' !!!
  1852                                  	;	pushf ; save flags	
  1853                                  	; 	<callback service code>
  1854                                  	; 	popf  ; restore flags
  1855                                  	; 	retn ; return to normal running address
  1856                                  	;
  1857                                  
  1858                                  	; 15/01/2017
  1859                                  	; 14/01/2017
  1860                                  	; 13/01/2017 (eax -> ebx)
  1861                                  	; 10/01/2017
  1862                                  set_callback_addr:
  1863                                  	; 09/01/2017 (**)
  1864                                  	; 02/01/2017 (*)
  1865                                  	; 25/12/2016 (*)
  1866                                  	; 19/12/2016 (TRDOS 386 feature only!)
  1867                                  	;
  1868                                  	; This routine sets return address
  1869                                  	; to start of user's interrupt
  1870                                  	; service (callback) address
  1871                                  	;; and sets callback 'retn' address to normal
  1872                                  	;; return address of user's running code! 
  1873                                  	;
  1874                                  	; INPUT:
  1875                                  	;	EBX = callback routine/service address
  1876                                  	;	      (virtual, not physical address!)	
  1877                                  	;	[u.sp] = kernel stack, points to
  1878                                  	;		 user's EIP,CS,EFLAGS,ESP,SS
  1879                                  	;		 registers.
  1880                                  	; OUTPUT:
  1881                                  	;	EIP (user) = callback (service) address
  1882                                  	;	CS (user) = UCODE
  1883                                  	;	EFLAGS (user) = flags before callback 	 
  1884                                  	;       ESP (user) = ESP-4 (user, before callback) 
  1885                                  	;	[ESP](user) = EIP (user) before callback
  1886                                  	;
  1887                                  	; Note: If CPU was in user mode while entering 
  1888                                  	;	the timer interrupt service routine,
  1889                                  	;	'IRET' will get return to callback routine
  1890                                  	;	immediately. If CPU was in system/kernel mode  
  1891                                  	;	'iret' will get return to system call and
  1892                                  	;	then, callback routine will be return address
  1893                                  	;	from system call. (User's callback/service code
  1894                                  	;	will be able to return to normal return address
  1895                                  	;	via an 'retn' at the end.) 
  1896                                  	;
  1897                                  	; Note(**): User's callback service code must be ended
  1898                                  	;	with a 'sysrele' sytstem call ! (09/01/2017)
  1899                                  	;
  1900                                  	;	For example:
  1901                                  	;
  1902                                  	;	timer_callback:
  1903                                  	;	    ...	 
  1904                                    	;	    inc	dword [time_counter]
  1905                                  	;	    ...
  1906                                  	;	    mov eax, 39 ; 'sysrele'
  1907                                  	;	    int 40h ; TRDOS 386 system call (interrupt)		
  1908                                  	;
  1909                                  	;
  1910                                  	;; Note(*): User's callback service code must preserve cpu 
  1911                                  	;;	flags if it has any instructions which changes
  1912                                  	;;	flags in the service code. (25/12/2016)
  1913                                  	;;
  1914                                  	;;	For example:
  1915                                  	;;
  1916                                  	;;	timer_callback:
  1917                                  	;;	    pushf ; save flags
  1918                                  	;;	    ; this instruction changes zero flag
  1919                                    	;;	    inc	dword [time_counter]
  1920                                  	;;	    popf ; restore flags
  1921                                  	;;	    retn ; return to normal user code
  1922                                  	;;		  (which is interrupted by the 
  1923                                  	;;		   timer interput) 	
  1924                                  	;;
  1925                                  
  1926                                  	; 15/01/2017
  1927 00000AB3 8B2D[5C030300]          	mov	ebp, [u.sp]; kernel's stack, points to EIP (user)
  1928 00000AB9 895D00                  	mov	[ebp], ebx
  1929 00000ABC E95CFFFFFF              	jmp	timer_int_return
  1930                                  
  1931                                  	; 15/01/2017
  1932                                  	; 13/01/2017
  1933                                  	; 19/12/2016
  1934                                  	; 06/06/2016
  1935                                  	; 23/05/2016
  1936                                  	; 22/05/2016
  1937                                  	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  1938                                  	; 26/02/2015
  1939                                  	; 07/09/2014
  1940                                  	; 25/08/2014
  1941                                  rtc_int:       ; Real Time Clock Interrupt (IRQ 8)
  1942                                  	; 22/05/2016
  1943 00000AC1 1E                      	push	ds ; ** ; 23/05/2016
  1944 00000AC2 50                      	push	eax ; *
  1945 00000AC3 66B81000                	mov	ax, KDATA
  1946 00000AC7 8ED8                    	mov	ds, ax
  1947                                  	;
  1948 00000AC9 8A25[0E820100]          	mov	ah, [RTC_2Hz] ;  2 Hz interrupt to 1 Hz function
  1949 00000ACF 80F401                  	xor	ah, 1
  1950 00000AD2 8825[0E820100]          	mov	[RTC_2Hz], ah ; 1 = 0.5 second, 0 = 1 second
  1951 00000AD8 753B                    	jnz	short rtc_int_return ; half second
  1952                                  	; 1 second
  1953                                  rtc_int_0:
  1954                                  	; 22/05/2016
  1955 00000ADA 58                      	pop	eax ; *
  1956                                  	;
  1957                                  	; 14/10/2015 ('timer_int')
  1958                                  	; Here, we are simulating system call entry (for task switch)
  1959                                  	; (If multitasking is enabled, 
  1960                                  	; 'clock' procedure may jump to 'sysrelease')
  1961                                  	;push	ds ; ** ; 23/05/2016
  1962 00000ADB 06                      	push	es
  1963 00000ADC 0FA0                    	push	fs
  1964 00000ADE 0FA8                    	push	gs
  1965 00000AE0 60                      	pushad  ; eax, ecx, edx, ebx, esp -before pushad-, ebp, esi, edi
  1966 00000AE1 66B91000                	mov     cx, KDATA
  1967                                          ;mov    ds, cx ; 06/06/2016
  1968 00000AE5 8EC1                            mov     es, cx
  1969 00000AE7 8EE1                            mov     fs, cx
  1970 00000AE9 8EE9                            mov     gs, cx
  1971                                  	;
  1972 00000AEB 0F20D9                  	mov	ecx, cr3
  1973 00000AEE 890D[5C040300]          	mov	[cr3reg], ecx ; save current cr3 register value/content
  1974                                  	;
  1975 00000AF4 803D[D4030300]00        	cmp	byte [u.t_lock], 0 ; timer lock (callback) status ?
  1976 00000AFB 7711                    	ja	short rtc_int_1	   ; yes
  1977                                  
  1978                                  	; 15/01/2017
  1979 00000AFD 3B0D[90810100]          	cmp 	ecx, [k_page_dir]
  1980 00000B03 7409                    	je	short rtc_int_1
  1981                                  
  1982 00000B05 8B0D[90810100]          	mov	ecx, [k_page_dir]
  1983 00000B0B 0F22D9                  	mov	cr3, ecx
  1984                                  rtc_int_1:
  1985                                  	; Timer event (kernel) functions must be performed with
  1986                                  	; 1 second intervals - TRDOS 386 (TRDOS v2.0) feature ! -
  1987                                   	;	
  1988                                  	; 25/08/2014
  1989 00000B0E E81A030000              	call	rtc_p  ; 19/05/2016 - major modification 
  1990                                  	
  1991                                  	; 23/05/2016
  1992 00000B13 28E4                    	sub	ah, ah ; 0
  1993                                  	; 22/05/2016 - TRDOS 386 timer event modifications
  1994                                  rtc_int_return: ; 19/05/2016
  1995                                  	; 22/02/2015 - dsectpm.s
  1996                                  	; [ source: http://wiki.osdev.org/RTC ]
  1997                                  	; read status register C to complete procedure
  1998                                  	;(it is needed to get a next IRQ 8) 
  1999 00000B15 B00C                    	mov	al, 0Ch ; 
  2000 00000B17 E670                    	out	70h, al ; select register C
  2001 00000B19 90                      	nop
  2002 00000B1A E471                    	in	al, 71h ; just throw away contents
  2003                                  	; 22/02/2015
  2004 00000B1C B020                    	MOV	AL,EOI		; END OF INTERRUPT
  2005                                  	;CLI			; DISABLE INTERRUPTS TILL STACK CLEARED
  2006 00000B1E E6A0                    	OUT	INTB00,AL	; FOR CONTROLLER #2
  2007                                  
  2008                                  	; 23/05/2016
  2009 00000B20 B020                    	MOV	AL,EOI		; GET END OF INTERRUPT MASK
  2010 00000B22 FA                      	CLI			; DISABLE INTERRUPTS TILL STACK CLEARED
  2011 00000B23 E620                    	OUT	INTA00,AL	; END OF INTERRUPT TO 8259 - 1	
  2012                                  	;
  2013                                  	; 23/05/2016
  2014 00000B25 20E4                    	and	ah, ah
  2015 00000B27 0F84B7FEFFFF                    jz      rtc_int_2
  2016                                  	
  2017                                  	; ah = 1 (half second)
  2018 00000B2D 58                      	pop	eax ; *
  2019 00000B2E 1F                      	pop	ds  ; **
  2020 00000B2F CF                      	iretd
  2021                                  
  2022                                  ; ////////////////
  2023                                  
  2024                                  	; 28/08/2014
  2025                                  irq0:
  2026 00000B30 6A00                            push 	dword 0
  2027 00000B32 EB48                    	jmp	short which_irq
  2028                                  irq1:
  2029 00000B34 6A01                            push 	dword 1
  2030 00000B36 EB44                    	jmp	short which_irq
  2031                                  irq2:
  2032 00000B38 6A02                            push 	dword 2
  2033 00000B3A EB40                    	jmp	short which_irq
  2034                                  irq3:
  2035                                  	; 20/11/2015
  2036                                  	; 24/10/2015
  2037 00000B3C 2EFF15[3A270100]        	call	dword [cs:com2_irq3]
  2038 00000B43 6A03                    	push 	dword 3
  2039 00000B45 EB35                    	jmp	short which_irq
  2040                                  irq4:
  2041                                  	; 20/11/2015
  2042                                  	; 24/10/2015
  2043 00000B47 2EFF15[36270100]        	call	dword [cs:com1_irq4]
  2044 00000B4E 6A04                            push 	dword 4
  2045 00000B50 EB2A                    	jmp	short which_irq
  2046                                  irq5:
  2047 00000B52 6A05                            push 	dword 5
  2048 00000B54 EB26                    	jmp	short which_irq
  2049                                  irq6:
  2050 00000B56 6A06                            push 	dword 6
  2051 00000B58 EB22                    	jmp	short which_irq
  2052                                  irq7:
  2053 00000B5A 6A07                            push 	dword 7
  2054 00000B5C EB1E                    	jmp	short which_irq
  2055                                  irq8:
  2056 00000B5E 6A08                            push 	dword 8
  2057 00000B60 EB1A                    	jmp	short which_irq
  2058                                  irq9:
  2059 00000B62 6A09                            push 	dword 9
  2060 00000B64 EB16                    	jmp	short which_irq
  2061                                  irq10:
  2062 00000B66 6A0A                            push 	dword 10
  2063 00000B68 EB12                    	jmp	short which_irq
  2064                                  irq11:
  2065 00000B6A 6A0B                            push 	dword 11
  2066 00000B6C EB0E                    	jmp	short which_irq
  2067                                  irq12:
  2068 00000B6E 6A0C                            push 	dword 12
  2069 00000B70 EB0A                    	jmp	short which_irq
  2070                                  irq13:
  2071 00000B72 6A0D                            push 	dword 13
  2072 00000B74 EB06                    	jmp	short which_irq
  2073                                  irq14:
  2074 00000B76 6A0E                            push 	dword 14
  2075 00000B78 EB02                    	jmp	short which_irq
  2076                                  irq15:
  2077 00000B7A 6A0F                            push 	dword 15
  2078                                  	;jmp	short which_irq
  2079                                  
  2080                                  	; 22/01/2017
  2081                                  	; 19/10/2015
  2082                                  	; 29/08/2014
  2083                                  	; 21/08/2014
  2084                                  which_irq:
  2085 00000B7C 870424                  	xchg	eax, [esp]  ; 28/08/2014
  2086 00000B7F 53                      	push	ebx
  2087 00000B80 56                      	push	esi
  2088 00000B81 57                      	push	edi
  2089 00000B82 1E                      	push 	ds
  2090 00000B83 06                      	push 	es
  2091                                  	;
  2092 00000B84 88C3                    	mov	bl, al
  2093                                  	;
  2094 00000B86 B810000000              	mov	eax, KDATA
  2095 00000B8B 8ED8                    	mov	ds, ax
  2096 00000B8D 8EC0                    	mov	es, ax
  2097                                  	; 19/10/2015
  2098 00000B8F FC                      	cld
  2099                                          ; 27/08/2014
  2100 00000B90 8105[98410100]A000-             add     dword [scr_row], 0A0h
  2100 00000B98 0000               
  2101                                  	;
  2102 00000B9A B417                    	mov	ah, 17h	; blue (1) background, 
  2103                                  			; light gray (7) forecolor
  2104 00000B9C 8B3D[98410100]                  mov     edi, [scr_row]
  2105 00000BA2 B049                    	mov	al, 'I'
  2106 00000BA4 66AB                    	stosw
  2107 00000BA6 B052                    	mov	al, 'R'
  2108 00000BA8 66AB                    	stosw
  2109 00000BAA B051                    	mov	al, 'Q'
  2110 00000BAC 66AB                    	stosw
  2111 00000BAE B020                    	mov	al, ' '
  2112 00000BB0 66AB                    	stosw
  2113 00000BB2 88D8                    	mov	al, bl
  2114 00000BB4 3C0A                    	cmp	al, 10
  2115 00000BB6 7208                    	jb	short ii1
  2116 00000BB8 B031                    	mov	al, '1'
  2117 00000BBA 66AB                    	stosw
  2118 00000BBC 88D8                    	mov	al, bl
  2119 00000BBE 2C0A                    	sub	al, 10
  2120                                  ii1:
  2121 00000BC0 0430                    	add	al, '0'
  2122 00000BC2 66AB                    	stosw
  2123 00000BC4 B020                    	mov	al, ' '
  2124 00000BC6 66AB                    	stosw
  2125 00000BC8 B021                    	mov	al, '!'
  2126 00000BCA 66AB                    	stosw
  2127 00000BCC B020                    	mov	al, ' '
  2128 00000BCE 66AB                    	stosw
  2129                                  	; 23/02/2015
  2130 00000BD0 80FB07                  	cmp	bl, 7 ; check for IRQ 8 to IRQ 15 
  2131 00000BD3 7604                    	jna	ii2
  2132                                  	; 22/01/2017
  2133 00000BD5 B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  2134 00000BD7 E6A0                    	out	0A0h, al ; the 2nd 8259
  2135                                  ii2:
  2136 00000BD9 B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  2137 00000BDB E620                    	out	20h, al ; the 2nd 8259
  2138 00000BDD E9CD010000              	jmp     iiret
  2139                                  	;
  2140                                  	; 22/08/2014
  2141                                  	;mov	al, 20h ; END OF INTERRUPT COMMAND TO 8259
  2142                                  	;out	20h, al	; 8259 PORT
  2143                                  	;
  2144                                  	;pop	es
  2145                                  	;pop	ds
  2146                                  	;pop	edi
  2147                                  	;pop	esi
  2148                                  	;pop	ebx
  2149                                  	;pop 	eax
  2150                                  	;iret
  2151                                  
  2152                                  	; 02/04/2015
  2153                                  	; 25/08/2014
  2154                                  exc0:
  2155 00000BE2 6A00                            push 	dword 0
  2156 00000BE4 E990000000                      jmp     cpu_except
  2157                                  exc1:
  2158 00000BE9 6A01                            push 	dword 1
  2159 00000BEB E989000000                      jmp     cpu_except
  2160                                  exc2:
  2161 00000BF0 6A02                            push 	dword 2
  2162 00000BF2 E982000000                      jmp     cpu_except
  2163                                  exc3:
  2164 00000BF7 6A03                            push 	dword 3
  2165 00000BF9 EB7E                            jmp     cpu_except
  2166                                  exc4:
  2167 00000BFB 6A04                            push 	dword 4
  2168 00000BFD EB7A                            jmp     cpu_except
  2169                                  exc5:
  2170 00000BFF 6A05                            push 	dword 5
  2171 00000C01 EB76                            jmp     cpu_except
  2172                                  exc6:
  2173 00000C03 6A06                            push 	dword 6
  2174 00000C05 EB72                            jmp     cpu_except
  2175                                  exc7:
  2176 00000C07 6A07                            push 	dword 7
  2177 00000C09 EB6E                            jmp     cpu_except
  2178                                  exc8:
  2179                                  	; [esp] = Error code
  2180 00000C0B 6A08                            push 	dword 8
  2181 00000C0D EB5C                            jmp     cpu_except_en
  2182                                  exc9:
  2183 00000C0F 6A09                            push 	dword 9
  2184 00000C11 EB66                            jmp     cpu_except
  2185                                  exc10:
  2186                                  	; [esp] = Error code
  2187 00000C13 6A0A                            push 	dword 10
  2188 00000C15 EB54                            jmp     cpu_except_en
  2189                                  exc11:
  2190                                  	; [esp] = Error code
  2191 00000C17 6A0B                            push 	dword 11
  2192 00000C19 EB50                            jmp     cpu_except_en
  2193                                  exc12:
  2194                                  	; [esp] = Error code
  2195 00000C1B 6A0C                            push 	dword 12
  2196 00000C1D EB4C                            jmp     cpu_except_en
  2197                                  exc13:
  2198                                  	; [esp] = Error code
  2199 00000C1F 6A0D                            push 	dword 13
  2200 00000C21 EB48                            jmp     cpu_except_en
  2201                                  exc14:
  2202                                  	; [esp] = Error code
  2203 00000C23 6A0E                            push 	dword 14
  2204 00000C25 EB44                    	jmp	short cpu_except_en
  2205                                  exc15:
  2206 00000C27 6A0F                            push 	dword 15
  2207 00000C29 EB4E                            jmp     cpu_except
  2208                                  exc16:
  2209 00000C2B 6A10                            push 	dword 16
  2210 00000C2D EB4A                            jmp     cpu_except
  2211                                  exc17:
  2212                                  	; [esp] = Error code
  2213 00000C2F 6A11                            push 	dword 17
  2214 00000C31 EB38                    	jmp	short cpu_except_en
  2215                                  exc18:
  2216 00000C33 6A12                            push 	dword 18
  2217 00000C35 EB42                    	jmp	short cpu_except
  2218                                  exc19:
  2219 00000C37 6A13                            push 	dword 19
  2220 00000C39 EB3E                    	jmp	short cpu_except
  2221                                  exc20:
  2222 00000C3B 6A14                            push 	dword 20
  2223 00000C3D EB3A                    	jmp	short cpu_except
  2224                                  exc21:
  2225 00000C3F 6A15                            push 	dword 21
  2226 00000C41 EB36                    	jmp	short cpu_except
  2227                                  exc22:
  2228 00000C43 6A16                            push 	dword 22
  2229 00000C45 EB32                    	jmp	short cpu_except
  2230                                  exc23:
  2231 00000C47 6A17                            push 	dword 23
  2232 00000C49 EB2E                    	jmp	short cpu_except
  2233                                  exc24:
  2234 00000C4B 6A18                            push 	dword 24
  2235 00000C4D EB2A                    	jmp	short cpu_except
  2236                                  exc25:
  2237 00000C4F 6A19                            push 	dword 25
  2238 00000C51 EB26                    	jmp	short cpu_except
  2239                                  exc26:
  2240 00000C53 6A1A                            push 	dword 26
  2241 00000C55 EB22                    	jmp	short cpu_except
  2242                                  exc27:
  2243 00000C57 6A1B                            push 	dword 27
  2244 00000C59 EB1E                    	jmp	short cpu_except
  2245                                  exc28:
  2246 00000C5B 6A1C                            push 	dword 28
  2247 00000C5D EB1A                    	jmp	short cpu_except
  2248                                  exc29:
  2249 00000C5F 6A1D                            push 	dword 29
  2250 00000C61 EB16                    	jmp	short cpu_except
  2251                                  exc30:
  2252 00000C63 6A1E                            push 	dword 30
  2253 00000C65 EB04                    	jmp	short cpu_except_en
  2254                                  exc31:
  2255 00000C67 6A1F                            push 	dword 31
  2256 00000C69 EB0E                            jmp     short cpu_except
  2257                                  
  2258                                  	; 19/10/2015
  2259                                  	; 19/09/2015
  2260                                  	; 01/09/2015
  2261                                  	; 28/08/2015
  2262                                  	; 28/08/2014
  2263                                  cpu_except_en:
  2264 00000C6B 87442404                	xchg	eax, [esp+4] ; Error code
  2265 00000C6F 36A3[78050300]          	mov	[ss:error_code], eax
  2266 00000C75 58                      	pop	eax  ; Exception number
  2267 00000C76 870424                  	xchg	eax, [esp]
  2268                                  		; eax = eax before exception
  2269                                  		; [esp] -> exception number
  2270                                  		; [esp+4] -> EIP to return
  2271                                  	; 22/01/2017
  2272                                  	; 19/10/2015
  2273                                  	; 19/09/2015
  2274                                  	; 01/09/2015
  2275                                  	; 28/08/2015
  2276                                  	; 29/08/2014
  2277                                  	; 28/08/2014
  2278                                  	; 25/08/2014
  2279                                  	; 21/08/2014
  2280                                  cpu_except:	; CPU Exceptions
  2281 00000C79 FC                      	cld
  2282 00000C7A 870424                  	xchg	eax, [esp] 
  2283                                  		; eax = Exception number
  2284                                  		; [esp] = eax (before exception)	
  2285 00000C7D 53                      	push	ebx
  2286 00000C7E 56                      	push	esi
  2287 00000C7F 57                      	push	edi
  2288 00000C80 1E                      	push 	ds
  2289 00000C81 06                      	push 	es
  2290                                  	; 28/08/2015
  2291 00000C82 66BB1000                	mov	bx, KDATA
  2292 00000C86 8EDB                    	mov	ds, bx
  2293 00000C88 8EC3                    	mov	es, bx
  2294 00000C8A 0F20DB                  	mov	ebx, cr3
  2295 00000C8D 53                      	push	ebx ; (*) page directory
  2296                                  	; 19/10/2015
  2297 00000C8E FC                      	cld
  2298                                  	; 25/03/2015
  2299 00000C8F 8B1D[90810100]          	mov	ebx, [k_page_dir]
  2300 00000C95 0F22DB                  	mov	cr3, ebx
  2301                                  	; 28/08/2015
  2302 00000C98 83F80E                  	cmp	eax, 0Eh ; 14, PAGE FAULT	
  2303 00000C9B 750F                    	jne	short cpu_except_nfp
  2304 00000C9D E8FF510000              	call	page_fault_handler
  2305 00000CA2 21C0                    	and 	eax, eax
  2306 00000CA4 0F8401010000                    jz	iiretp ; 01/09/2015
  2307 00000CAA B00E                    	mov	al, 0Eh ; 14
  2308                                  cpu_except_nfp:
  2309                                  	; 23/08/2016
  2310 00000CAC 803D[BA6F0000]03        	cmp	byte [CRT_MODE], 3
  2311 00000CB3 7409                    	je	short cpu_except_mode_3
  2312 00000CB5 50                      	push	eax
  2313 00000CB6 B003                    	mov	al, 3
  2314 00000CB8 E8AB0E0000              	call	_set_mode
  2315 00000CBD 58                      	pop	eax
  2316                                  cpu_except_mode_3:
  2317                                  	; 02/04/2015
  2318 00000CBE BB[0B090000]            	mov	ebx, hang
  2319 00000CC3 875C241C                	xchg	ebx, [esp+28]
  2320                                  		; EIP (points to instruction which faults)
  2321                                  	  	; New EIP (hang)
  2322 00000CC7 891D[7C050300]          	mov	[FaultOffset], ebx
  2323 00000CCD C744242008000000        	mov	dword [esp+32], KCODE ; kernel's code segment
  2324 00000CD5 814C242400020000        	or	dword [esp+36], 200h ; enable interrupts (set IF)
  2325                                  	;
  2326 00000CDD 88C4                    	mov	ah, al
  2327 00000CDF 240F                    	and	al, 0Fh
  2328 00000CE1 3C09                    	cmp	al, 9
  2329 00000CE3 7602                    	jna	short h1ok
  2330 00000CE5 0407                    	add	al, 'A'-':'
  2331                                  h1ok:
  2332 00000CE7 C0EC04                  	shr	ah, 4
  2333 00000CEA 80FC09                  	cmp	ah, 9
  2334 00000CED 7603                    	jna	short h2ok
  2335 00000CEF 80C407                  	add	ah, 'A'-':'
  2336                                  h2ok:	
  2337 00000CF2 86E0                    	xchg 	ah, al	
  2338 00000CF4 66053030                	add	ax, '00'
  2339 00000CF8 66A3[F0430100]          	mov	[excnstr], ax
  2340                                  	;
  2341                                  	; 29/08/2014
  2342 00000CFE A1[7C050300]            	mov	eax, [FaultOffset]
  2343 00000D03 51                      	push	ecx
  2344 00000D04 52                      	push	edx
  2345 00000D05 89E3                    	mov	ebx, esp
  2346                                  	; 28/08/2015
  2347 00000D07 B910000000              	mov	ecx, 16	  ; divisor value to convert binary number
  2348                                  			  ; to hexadecimal string
  2349                                  	;mov	ecx, 10	    ; divisor to convert	
  2350                                  			    ; binary number to decimal string
  2351                                  b2d1:
  2352 00000D0C 31D2                    	xor	edx, edx
  2353 00000D0E F7F1                    	div	ecx
  2354 00000D10 6652                    	push	dx
  2355 00000D12 39C8                    	cmp	eax, ecx
  2356 00000D14 73F6                    	jnb	short b2d1
  2357 00000D16 BF[FB430100]            	mov	edi, EIPstr ; EIP value
  2358                                  			    ; points to instruction which faults	
  2359                                  	; 28/08/2015
  2360 00000D1B 89C2                    	mov	edx, eax
  2361                                  b2d2:
  2362                                  	;add	al, '0'
  2363 00000D1D 8A82[15430000]          	mov	al, [edx+hexchrs]
  2364 00000D23 AA                      	stosb		    ; write hexadecimal digit to its place	
  2365 00000D24 39E3                    	cmp	ebx, esp
  2366 00000D26 7606                    	jna	short b2d3
  2367 00000D28 6658                    	pop	ax
  2368 00000D2A 88C2                    	mov	dl, al
  2369 00000D2C EBEF                    	jmp	short b2d2
  2370                                  b2d3:
  2371 00000D2E B068                    	mov 	al, 'h' ; 28/08/2015
  2372 00000D30 AA                      	stosb
  2373 00000D31 B020                    	mov	al, 20h	    ; space
  2374 00000D33 AA                      	stosb
  2375 00000D34 30C0                    	xor	al, al	    ; to do it an ASCIIZ string	
  2376 00000D36 AA                      	stosb
  2377                                  	;
  2378 00000D37 5A                      	pop	edx
  2379 00000D38 59                      	pop	ecx
  2380                                  	;
  2381 00000D39 B44F                    	mov	ah, 4Fh	; red (4) background, 
  2382                                  			; white (F) forecolor
  2383 00000D3B BE[E0430100]            	mov	esi, exc_msg ; message offset
  2384                                  	;
  2385                                  	; 20/01/2017 (!cpu exception!)
  2386                                  	;
  2387 00000D40 8105[98410100]A000-             add    dword [scr_row], 0A0h
  2387 00000D48 0000               
  2388 00000D4A 8B3D[98410100]                  mov    edi, [scr_row]
  2389                                  	;	
  2390 00000D50 C605[5B030300]00        	mov	byte [sysflg], 0  ; system mode
  2391 00000D57 FB                              sti
  2392                                  	;
  2393 00000D58 E8EDFBFFFF              	call 	printk
  2394                                  	;
  2395 00000D5D B410                    	mov	ah, 10h
  2396 00000D5F E881010000              	call	int16h ; getc
  2397                                  	;
  2398 00000D64 B003                    	mov	al, 3
  2399 00000D66 E8FD0D0000              	call	_set_mode
  2400                                  	;
  2401 00000D6B B801000000              	mov	eax, 1
  2402 00000D70 E9FECC0000              	jmp	sysexit ; terminate process !!!
  2403                                  	
  2404                                  	; 22/01/2017
  2405                                  	; 18/04/2016
  2406                                  	; 28/08/2015
  2407                                  	; 23/02/2015
  2408                                  	; 20/08/2014
  2409                                  ignore_int:
  2410 00000D75 50                      	push	eax
  2411 00000D76 53                      	push	ebx ; 23/02/2015
  2412 00000D77 56                      	push	esi
  2413 00000D78 57                      	push	edi
  2414 00000D79 1E                      	push 	ds
  2415 00000D7A 06                      	push 	es
  2416                                  	; 18/04/2016
  2417 00000D7B 66B81000                	mov	ax, KDATA
  2418 00000D7F 8ED8                    	mov	ds, ax
  2419 00000D81 8EC0                    	mov	es, ax
  2420                                  	; 28/08/2015
  2421 00000D83 0F20D8                  	mov	eax, cr3
  2422 00000D86 50                      	push	eax ; (*) page directory
  2423                                  	;
  2424 00000D87 B467                    	mov	ah, 67h	; brown (6) background, 
  2425                                  			; light gray (7) forecolor
  2426 00000D89 BE[A8420100]            	mov	esi, int_msg ; message offset
  2427                                  piemsg:
  2428                                          ; 27/08/2014
  2429 00000D8E 8105[98410100]A000-             add     dword [scr_row], 0A0h
  2429 00000D96 0000               
  2430 00000D98 8B3D[98410100]                  mov     edi, [scr_row]
  2431                                          ;
  2432 00000D9E E8A7FBFFFF              	call 	printk
  2433                                  	;
  2434                                  	; 23/02/2015
  2435 00000DA3 B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  2436 00000DA5 E6A0                    	out	0A0h, al ; the 2nd 8259
  2437                                  	; 22/08/2014
  2438 00000DA7 B020                    	mov	al, 20h ; END OF INTERRUPT COMMAND TO 8259
  2439 00000DA9 E620                    	out	20h, al	; 8259 PORT
  2440                                  iiretp: 
  2441                                  	; 22/01/2017
  2442                                  	; 01/09/2015
  2443                                  	; 28/08/2015
  2444 00000DAB 58                      	pop	eax ; (*) page directory
  2445 00000DAC 0F22D8                  	mov	cr3, eax
  2446                                  iiret:
  2447 00000DAF 07                      	pop	es
  2448 00000DB0 1F                      	pop	ds
  2449 00000DB1 5F                      	pop	edi
  2450 00000DB2 5E                      	pop	esi
  2451 00000DB3 5B                      	pop	ebx ; 29/08/2014
  2452 00000DB4 58                      	pop 	eax
  2453 00000DB5 CF                      	iretd
  2454                                  
  2455                                  	; 23/05/2016
  2456                                  	; 22/08/2014
  2457                                  	; IBM PC/AT BIOS source code ----- 10/06/85 (bios.asm)
  2458                                  	; (INT 1Ah)
  2459                                  	;; Linux (v0.12) source code (main.c) by Linus Torvalds (1991)
  2460                                  time_of_day:
  2461 00000DB6 E8D55E0000              	call	UPD_IPR			; WAIT TILL UPDATE NOT IN PROGRESS
  2462 00000DBB 726F                            jc      short time_of_day_retn ; 23/05/2016
  2463 00000DBD B000                    	mov	al, CMOS_SECONDS
  2464 00000DBF E8E75E0000              	call	CMOS_READ
  2465 00000DC4 A2[00820100]            	mov	[time_seconds], al 
  2466 00000DC9 B002                    	mov	al, CMOS_MINUTES
  2467 00000DCB E8DB5E0000              	call	CMOS_READ
  2468 00000DD0 A2[01820100]            	mov	[time_minutes], al 
  2469 00000DD5 B004                    	mov	al, CMOS_HOURS
  2470 00000DD7 E8CF5E0000              	call	CMOS_READ
  2471 00000DDC A2[02820100]                    mov     [time_hours], al
  2472 00000DE1 B006                    	mov	al, CMOS_DAY_WEEK 
  2473 00000DE3 E8C35E0000              	call	CMOS_READ
  2474 00000DE8 A2[03820100]            	mov	[date_wday], al
  2475 00000DED B007                     	mov	al, CMOS_DAY_MONTH
  2476 00000DEF E8B75E0000              	call	CMOS_READ
  2477 00000DF4 A2[04820100]            	mov	[date_day], al
  2478 00000DF9 B008                    	mov	al, CMOS_MONTH
  2479 00000DFB E8AB5E0000              	call	CMOS_READ
  2480 00000E00 A2[05820100]            	mov	[date_month], al
  2481 00000E05 B009                    	mov	al, CMOS_YEAR
  2482 00000E07 E89F5E0000              	call	CMOS_READ
  2483 00000E0C A2[06820100]            	mov	[date_year], al
  2484 00000E11 B032                    	mov	al, CMOS_CENTURY
  2485 00000E13 E8935E0000              	call	CMOS_READ
  2486 00000E18 A2[07820100]            	mov	[date_century], al
  2487                                  	;
  2488 00000E1D B000                    	mov	al, CMOS_SECONDS
  2489 00000E1F E8875E0000              	call 	CMOS_READ
  2490 00000E24 3A05[00820100]          	cmp	al, [time_seconds]
  2491 00000E2A 758A                    	jne	short time_of_day
  2492                                  
  2493                                  time_of_day_retn:
  2494 00000E2C C3                      	retn
  2495                                  
  2496                                  	; 15/01/2017
  2497                                  	; 10/06/2016
  2498                                  	; 07/06/2016
  2499                                  	; 06/06/2016
  2500                                  	; 23/05/2016
  2501                                  rtc_p:
  2502 00000E2D B101                    	mov	cl, 1 ; 15/01/2017
  2503 00000E2F EB02                    	jmp	short rtc_p0
  2504                                  u_timer: 
  2505                                  	; Timer Events with 18.2 Hz Timer Ticks
  2506                                  	; (and also timer events with RTC seconds)
  2507 00000E31 28C9                    	sub	cl, cl ; mov cl, 0 ; 15/01/2017
  2508                                  rtc_p0:
  2509                                  	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  2510                                  	; Major Modification:
  2511                                  	; Check and Perform Timer Events (for RTC)
  2512                                  	; 25/08/2014 - 07/09/2014
  2513                                  	; Retro UNIX 386 v1:
  2514                                   	; Print Real Time Clock content
  2515                                  	
  2516                                  	; 15/01/2017
  2517 00000E33 880D[208E0100]          	mov	byte [priority], cl ; 0 or 1 (not 2)
  2518 00000E39 8A2D[238E0100]          	mov	ch, [timer_events]
  2519 00000E3F 20ED                    	and	ch, ch
  2520 00000E41 7420                    	jz	short rtc_p3
  2521                                  
  2522 00000E43 BE[60040300]            	mov	esi, timer_set  ; beginning address of
  2523                                  				; timer events space
  2524                                  rtc_p1:
  2525 00000E48 8B06                    	mov	eax, [esi]	
  2526 00000E4A 20C0                    	and	al, al ; 0 = free, >0 = process no.
  2527 00000E4C 7416                    	jz	short rtc_p4
  2528                                  	;
  2529 00000E4E C1C810                  	ror	eax, 16
  2530                                  	; ah = response value, al = interrupt type
  2531                                  	; 15/01/2017
  2532                                  	; cl = interrupt source
  2533                                  	;       1 = RTC, 0 = PIT  	 	
  2534 00000E51 38C8                    	cmp	al, cl 
  2535 00000E53 750A                    	jne	short rtc_p2 ; not as requested or undefined !
  2536 00000E55 3C01                    	cmp	al, 1 ; 1 ; RTC interrupt ?
  2537 00000E57 7410                    	je	short rtc_p5 ; yes, check for response
  2538                                  	; 06/06/2016 - 18.2 Hz Timer Ticks
  2539 00000E59 836E080A                	sub	dword [esi+8], 10 ; 1 tick = 10
  2540 00000E5D 7613                    	jna	short rtc_p6  ; continue for responding
  2541                                  rtc_p2:
  2542                                  	; 15/01/2017 (cl -> ch)
  2543                                  	; 07/06/2016
  2544 00000E5F FECD                    	dec	ch    ; remain count of timer events	
  2545 00000E61 7501                    	jnz	short rtc_p4
  2546                                  rtc_p3:	 
  2547 00000E63 C3                      	retn
  2548                                  rtc_p4:	
  2549                                  	;cmp	esi, timer_set + 240 ; 15*16 (last event)
  2550                                  	;jnb	short rtc_p3 ; end of timer event space
  2551 00000E64 83C610                  	add	esi, 16 ; next timer event
  2552 00000E67 EBDF                    	jmp	short rtc_p1
  2553                                  rtc_p5:	 
  2554                                  	; current timer count ; 06/06/2016 (182)
  2555 00000E69 816E08B6000000          	sub	dword [esi+8], 182 ; 1 second (10*18.2)
  2556 00000E70 77ED                    	ja	short rtc_p2  ; check for the next 
  2557                                  rtc_p6:	
  2558                                  	; it is the time of response! 
  2559 00000E72 8B5E04                  	mov	ebx, [esi+4] ; set (count limit) value
  2560 00000E75 895E08                  	mov	[esi+8], ebx ; reset count down value
  2561                                  			     ; to count limit
  2562                                  	; 19/12/2016
  2563                                  	; 10/12/2016 - timer callback modification
  2564 00000E78 8B7E0C                  	mov	edi, [esi+12] ; response (or callback) address	
  2565 00000E7B 807E0100                	cmp	byte [esi+1], 0 ; >0 = callback
  2566 00000E7F 762A                    	jna	short rtc_p8
  2567                                  
  2568                                  	; timer callback !
  2569 00000E81 0FB61E                  	movzx	ebx, byte [esi] ; process number (>0)
  2570 00000E84 89D8                    	mov	eax, ebx
  2571 00000E86 C0E302                  	shl	bl, 2 ; *4
  2572 00000E89 89BB[0C010300]          	mov	[ebx+p.tcb-4], edi ; user's callback service addr
  2573 00000E8F 3A05[B3030300]          	cmp	al, [u.uno]
  2574 00000E95 7521                    	jne	short rtc_p9
  2575 00000E97 893D[D0030300]          	mov	[u.tcb], edi
  2576                                  rtc_p7:
  2577                                  	; 15/01/2017
  2578 00000E9D B002                    	mov	al, 2
  2579 00000E9F A2[208E0100]            	mov	[priority], al ; 2
  2580                                  	; 10/01/2017
  2581                                  	;mov	byte [u.pri], 2
  2582 00000EA4 A2[A9030300]            	mov	[u.pri], al ; 2
  2583 00000EA9 EBB4                    	jmp	short rtc_p2
  2584                                  rtc_p8:
  2585                                  	; response address is physical address of
  2586                                  	; the program's response (signal return) byte
  2587                                  	; 06/06/2016
  2588                                  	;mov	edi, [esi+12] ; response address
  2589 00000EAB 8827                    	mov	[edi], ah     ; response value 
  2590                                  	;
  2591 00000EAD C1C010                  	rol	eax, 16
  2592                                  	; 15/01/2017
  2593 00000EB0 3A05[B3030300]          	cmp	al, [u.uno] ; running process ?
  2594 00000EB6 74E5                    	je	short rtc_p7
  2595                                  rtc_p9:
  2596                                  	; al = process number  ; 10/06/2016
  2597 00000EB8 B202                    	mov	dl, 2 ; priority, 2 = event (high)	
  2598 00000EBA E871150100              	call	set_run_sequence ; 19/05/2016
  2599 00000EBF EB9E                    	jmp	short rtc_p2 ; 10/06/2016
  2600                                  
  2601                                  ; Default IRQ 7 handler against spurious IRQs (from master PIC)
  2602                                  ; 25/02/2015 (source: http://wiki.osdev.org/8259_PIC)
  2603                                  default_irq7:
  2604 00000EC1 6650                    	push	ax
  2605 00000EC3 B00B                    	mov	al, 0Bh  ; In-Service register
  2606 00000EC5 E620                    	out	20h, al
  2607 00000EC7 EB00                            jmp short $+2
  2608 00000EC9 EB00                    	jmp short $+2
  2609 00000ECB E420                    	in	al, 20h
  2610 00000ECD 2480                    	and 	al, 80h ; bit 7 (is it real IRQ 7 or fake?)
  2611 00000ECF 7404                            jz      short irq7_iret ; Fake (spurious) IRQ, do not send EOI 
  2612 00000ED1 B020                            mov     al, 20h ; EOI
  2613 00000ED3 E620                    	out	20h, al 
  2614                                  irq7_iret:
  2615 00000ED5 6658                    	pop	ax
  2616 00000ED7 CF                      	iretd
  2617                                  	
  2618                                  bcd_to_ascii:
  2619                                  	; 25/08/2014
  2620                                  	; INPUT ->
  2621                                  	;	al = Packed BCD number
  2622                                  	; OUTPUT ->
  2623                                  	;	ax  = ASCII word/number
  2624                                  	;
  2625                                  	; Erdogan Tan - 1998 (proc_hex) - TRDOS.ASM (2004-2011)
  2626                                  	;
  2627 00000ED8 D410                    	db 0D4h,10h                     ; Undocumented inst. AAM
  2628                                  					; AH = AL / 10h
  2629                                  					; AL = AL MOD 10h
  2630 00000EDA 660D3030                	or ax,'00'                      ; Make it ASCII based
  2631                                  
  2632 00000EDE 86E0                            xchg ah, al 
  2633                                  	
  2634 00000EE0 C3                      	retn
  2635                                  
  2636                                  ; 15/12/2020
  2637                                  real_mem_16m_64k: 
  2638 00000EE1 0000                    	dw 0	; Real size of system memory (if > 16MB)
  2639                                  		; as number of 64K blocks - 256
  2640                                  		; (This is for saving real system memory
  2641                                  		; because if system memory is larger than
  2642                                  		; 3 GB and if a VESA VBE video bios
  2643                                  		; is detected, 'mem_16m_64K' may be
  2644                                  		; decreased to reserve LFB space 
  2645                                  		; at the end of system memory.)
  2646                                  		; Upper memory space from LFB base address
  2647                                  		; to 4GB will not be included by M.A.T.
  2648                                  def_LFB_addr:	
  2649 00000EE3 0000                    	dw 0 	; HW of default LFB addr (for mode 118h)	
  2650                                  	
  2651                                  
  2652                                  %include 'keyboard.s' ; 07/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - keyboard.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 15/01/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 17/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; keyboard.inc (17/10/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - KEYBOARD.INC
    20                              <1> ; Last Modification: 17/10/2015
    21                              <1> ;		    (Keyboard Data is in 'KYBDATA.INC')	
    22                              <1> ;
    23                              <1> ; ///////// KEYBOARD FUNCTIONS (PROCEDURES) ///////////////
    24                              <1> 
    25                              <1> ; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
    26                              <1> 
    27                              <1> ; 03/12/2014
    28                              <1> ; 26/08/2014
    29                              <1> ; KEYBOARD I/O
    30                              <1> ; (INT_16h - Retro UNIX 8086 v1 - U9.ASM, 30/06/2014)
    31                              <1> 
    32                              <1> ;NOTE: 'k0' to 'k7' are name of OPMASK registers.
    33                              <1> ;	(The reason of using '_k' labels!!!) (27/08/2014)    
    34                              <1> ;NOTE: 'NOT' keyword is '~' unary operator in NASM.
    35                              <1> ;	('NOT LC_HC' --> '~LC_HC') (bit reversing operator)
    36                              <1> 
    37                              <1> int16h:	; 30/06/2015
    38                              <1> ;getc:
    39 00000EE5 9C                  <1> 	pushfd	; 28/08/2014
    40 00000EE6 0E                  <1> 	push 	cs
    41 00000EE7 E801000000          <1> 	call 	KEYBOARD_IO_1 ; getc_int
    42 00000EEC C3                  <1> 	retn	
    43                              <1> 
    44                              <1> getc_int:
    45                              <1> 	; 28/02/2015
    46                              <1> 	; 03/12/2014 (derivation from pc-xt-286 bios source code -1986-, 
    47                              <1> 	;	      instead of pc-at bios - 1985-)
    48                              <1> 	; 28/08/2014 (_k1d)
    49                              <1> 	; 30/06/2014
    50                              <1> 	; 03/03/2014
    51                              <1> 	; 28/02/2014
    52                              <1> 	; Derived from "KEYBOARD_IO_1" procedure of IBM "pc-xt-286" 
    53                              <1> 	; rombios source code (21/04/1986)
    54                              <1> 	;	 'keybd.asm', INT 16H, KEYBOARD_IO
    55                              <1> 	;
    56                              <1> 	; KYBD --- 03/06/86  KEYBOARD BIOS
    57                              <1> 	;
    58                              <1> 	;--- INT 16 H -----------------------------------------------------------------
    59                              <1> 	; KEYBOARD I/O								      :
    60                              <1> 	;	THESE ROUTINES PROVIDE READ KEYBOARD SUPPORT			      :
    61                              <1> 	; INPUT									      :
    62                              <1> 	;	(AH)= 00H  READ THE NEXT ASCII CHARACTER ENTERED FROM THE KEYBOARD,   :
    63                              <1> 	;		   RETURN THE RESULT IN (AL), SCAN CODE IN (AH).              :
    64                              <1> 	;		   THIS IS THE COMPATIBLE READ INTERFACE, EQUIVALENT TO THE   :
    65                              <1> 	;                  STANDARD PC OR PCAT KEYBOARD				      :	
    66                              <1> 	;-----------------------------------------------------------------------------:
    67                              <1> 	;	(AH)= 01H  SET THE ZERO FLAG TO INDICATE IF AN ASCII CHARACTER IS     :
    68                              <1> 	;		   AVAILABLE TO BE READ FROM THE KEYBOARD BUFFER.	      :
    69                              <1> 	;		   (ZF)= 1 -- NO CODE AVAILABLE			              :
    70                              <1> 	;		   (ZF)= 0 -- CODE IS AVAILABLE  (AX)= CHARACTER              :
    71                              <1> 	;		   IF (ZF)= 0, THE NEXT CHARACTER IN THE BUFFER TO BE READ IS :
    72                              <1> 	;		   IN (AX), AND THE ENTRY REMAINS IN THE BUFFER.              :
    73                              <1> 	;		   THIS WILL RETURN ONLY PC/PCAT KEYBOARD COMPATIBLE CODES    :
    74                              <1> 	;-----------------------------------------------------------------------------:	
    75                              <1> 	;	(AH)= 02H  RETURN THE CURRENT SHIFT STATUS IN AL REGISTER             :
    76                              <1> 	;		   THE BIT SETTINGS FOR THIS CODE ARE INDICATED IN THE        :
    77                              <1> 	;		   EQUATES FOR @KB_FLAG		                              :
    78                              <1> 	;-----------------------------------------------------------------------------:	
    79                              <1> 	;	(AH)= 03H  SET TYPAMATIC RATE AND DELAY                               :
    80                              <1> 	;	      (AL) = 05H                                                      :
    81                              <1> 	;	      (BL) = TYPAMATIC RATE (BITS 5 - 7 MUST BE RESET TO 0)           :
    82                              <1> 	;		       							      :
    83                              <1> 	;                     REGISTER     RATE      REGISTER     RATE                :
    84                              <1> 	;                      VALUE     SELECTED     VALUE     SELECTED              :
    85                              <1> 	;                     --------------------------------------------            :
    86                              <1> 	;			00H        30.0        10H        7.5                 :
    87                              <1> 	;			01H        26.7        11H        6.7                 :
    88                              <1> 	;			02H        24.0        12H        6.0                 :
    89                              <1> 	;			03H        21.8        13H        5.5                 :
    90                              <1> 	;			04H        20.0        14H        5.0                 :
    91                              <1> 	;			05H        18.5        15H        4.6                 :
    92                              <1> 	;			06H        17.1        16H        4.3                 :
    93                              <1> 	;			07H        16.0        17H        4.0                 :
    94                              <1> 	;			08H        15.0        18H        3.7                 :
    95                              <1> 	;			09H        13.3        19H        3.3                 :
    96                              <1> 	;			0AH        12.0        1AH        3.0                 :
    97                              <1> 	;			0BH        10.9        1BH        2.7                 :
    98                              <1>         ;			0CH        10.0        1CH        2.5                 :
    99                              <1> 	;			0DH         9.2        1DH        2.3                 :
   100                              <1> 	;			0EH         8.6        1EH        2.1                 :
   101                              <1> 	;			0FH         8.0        1FH        2.0                 :
   102                              <1> 	;									      :
   103                              <1> 	;	      (BH) = TYPAMATIC DELAY  (BITS 2 - 7 MUST BE RESET TO 0)         :
   104                              <1> 	;		       							      :
   105                              <1> 	;                     REGISTER     DELAY                                      :
   106                              <1> 	;                      VALUE       VALUE                                      :
   107                              <1> 	;                     ------------------                                      :
   108                              <1> 	;			00H        250 ms                                     :
   109                              <1> 	;			01H        500 ms                                     :
   110                              <1> 	;			02H        750 ms                                     :
   111                              <1> 	;			03H       1000 ms                                     :
   112                              <1> 	;-----------------------------------------------------------------------------:
   113                              <1> 	;	(AH)= 05H  PLACE ASCII CHARACTER/SCAN CODE COMBINATION IN KEYBOARD    :
   114                              <1> 	;		   BUFFER AS IF STRUCK FROM KEYBOARD                          :
   115                              <1> 	;		   ENTRY:  (CL) = ASCII CHARACTER		              :
   116                              <1> 	;		           (CH) = SCAN CODE                                   :
   117                              <1> 	;		   EXIT:   (AH) = 00H = SUCCESSFUL OPERATION                  :
   118                              <1> 	;		           (AL) = 01H = UNSUCCESSFUL - BUFFER FULL            :
   119                              <1> 	;		   FLAGS:  CARRY IF ERROR                                     :
   120                              <1> 	;-----------------------------------------------------------------------------:		
   121                              <1> 	;	(AH)= 10H  EXTENDED READ INTERFACE FOR THE ENHANCED KEYBOARD,         :
   122                              <1> 	;		   OTHERWISE SAME AS FUNCTION AH=0                            :
   123                              <1> 	;-----------------------------------------------------------------------------:
   124                              <1> 	;	(AH)= 11H  EXTENDED ASCII STATUS FOR THE ENHANCED KEYBOARD,           :
   125                              <1> 	;		   OTHERWISE SAME AS FUNCTION AH=1                            :
   126                              <1> 	;-----------------------------------------------------------------------------:	
   127                              <1> 	;	(AH)= 12H  RETURN THE EXTENDED SHIFT STATUS IN AX REGISTER            :
   128                              <1> 	;		   AL = BITS FROM KB_FLAG, AH = BITS FOR LEFT AND RIGHT       :
   129                              <1> 	;		   CTL AND ALT KEYS FROM KB_FLAG_1 AND KB_FLAG_3              :
   130                              <1> 	; OUTPUT					                              :
   131                              <1> 	;	AS NOTED ABOVE, ONLY (AX) AND FLAGS CHANGED	                      :
   132                              <1> 	;	ALL REGISTERS RETAINED		                                      :
   133                              <1> 	;------------------------------------------------------------------------------
   134                              <1> 
   135                              <1> ; 15/01/2017
   136                              <1> ; 14/01/2017
   137                              <1> ; 02/01/2017
   138                              <1> ; 29/05/2016
   139                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   140                              <1> int32h:  ; Keyboard BIOS
   141                              <1> 
   142                              <1> KEYBOARD_IO_1:	
   143                              <1> 	;sti				; INTERRUPTS BACK ON
   144                              <1> 	; 29/05/2016
   145 00000EED 80642408BE          <1>         and     byte [esp+8], 10111110b ; clear zero flag and cary flag
   146                              <1> 	;
   147 00000EF2 1E                  <1> 	push	ds			; SAVE CURRENT DS
   148 00000EF3 53                  <1> 	push	ebx			; SAVE BX TEMPORARILY
   149                              <1> 	;push	ecx			; SAVE CX TEMPORARILY
   150 00000EF4 66BB1000            <1>         mov     bx, KDATA 
   151 00000EF8 8EDB                <1> 	mov	ds, bx			; PUT SEGMENT VALUE OF DATA AREA INTO DS
   152                              <1> 
   153                              <1> 	; 14/01/2017
   154 00000EFA 8B1C24              <1> 	mov	ebx, [esp]
   155                              <1> 	;; 15/01/2017
   156                              <1> 	; 02/01/2017
   157                              <1> 	;;mov	byte [intflg], 32h	; keyboard interrupt 
   158 00000EFD FB                  <1> 	sti
   159                              <1> 	;
   160                              <1> 
   161 00000EFE 08E4                <1> 	or	ah, ah			; CHECK FOR (AH)= 00H
   162 00000F00 743A                <1> 	jz	short _K1		; ASCII_READ
   163 00000F02 FECC                <1> 	dec	ah                      ; CHECK FOR (AH)= 01H
   164 00000F04 7453                <1>         jz      short _K2               ; ASCII_STATUS
   165 00000F06 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 02H
   166 00000F08 0F8494000000        <1>         jz      _K3                     ; SHIFT STATUS
   167 00000F0E FECC                <1> 	dec	ah			; CHECK FOR (AH)= 03H	
   168 00000F10 0F8493000000        <1>         jz      _K300                   ; SET TYPAMATIC RATE/DELAY
   169 00000F16 80EC02              <1> 	sub	ah, 2			; CHECK FOR (AH)= 05H	
   170 00000F19 0F84BC000000        <1>         jz      _K500                   ; KEYBOARD WRITE         
   171                              <1> _KIO1:	
   172 00000F1F 80EC0B              <1> 	sub	ah, 11			; AH =  10H
   173 00000F22 740C                <1> 	jz	short _K1E		; EXTENDED ASCII READ
   174 00000F24 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 11H
   175 00000F26 7422                <1> 	jz	short _K2E		; EXTENDED_ASCII_STATUS
   176 00000F28 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 12H
   177 00000F2A 7458                <1> 	jz	short _K3E		; EXTENDED_SHIFT_STATUS
   178                              <1> _KIO_EXIT:
   179                              <1> 	; 02/01/2017
   180 00000F2C FA                  <1> 	cli
   181                              <1> 	;;mov	byte [intflg], 0 ;; 15/01/2017
   182                              <1> 	;
   183                              <1> 	;pop	ecx			; RECOVER REGISTER
   184 00000F2D 5B                  <1> 	pop	ebx			; RECOVER REGISTER
   185 00000F2E 1F                  <1> 	pop	ds			; RECOVER SEGMENT
   186 00000F2F CF                  <1> 	iretd				; INVALID COMMAND, EXIT
   187                              <1> 
   188                              <1> 	;-----	ASCII CHARACTER
   189                              <1> _K1E:	
   190 00000F30 E8D3000000          <1> 	call	_K1S			; GET A CHARACTER FROM THE BUFFER (EXTENDED)
   191 00000F35 E848010000          <1> 	call	_KIO_E_XLAT		; ROUTINE TO XLATE FOR EXTENDED CALLS
   192 00000F3A EBF0                <1> 	jmp	short _KIO_EXIT         ; GIVE IT TO THE CALLER
   193                              <1> _K1:	
   194 00000F3C E8C7000000          <1> 	call	_K1S			; GET A CHARACTER FROM THE BUFFER
   195 00000F41 E847010000          <1> 	call	_KIO_S_XLAT		; ROUTINE TO XLATE FOR STANDARD CALLS
   196 00000F46 72F4                <1> 	jc	short _K1		; CARRY SET MEANS TROW CODE AWAY
   197                              <1> _K1A:
   198 00000F48 EBE2                <1> 	jmp	short _KIO_EXIT         ; RETURN TO CALLER
   199                              <1> 
   200                              <1> 	;-----	ASCII STATUS
   201                              <1> _K2E:	
   202 00000F4A E804010000          <1> 	call	_K2S			; TEST FOR CHARACTER IN BUFFER (EXTENDED)
   203 00000F4F 7420                <1> 	jz	short _K2B		; RETURN IF BUFFER EMPTY
   204 00000F51 9C                  <1> 	pushf				; SAVE ZF FROM TEST
   205 00000F52 E82B010000          <1> 	call	_KIO_E_XLAT		; ROUTINE TO XLATE FOR EXTENDED CALLS
   206 00000F57 EB17                <1> 	jmp	short _K2A	        ; GIVE IT TO THE CALLER
   207                              <1> _K2:	
   208 00000F59 E8F5000000          <1> 	call	_K2S			; TEST FOR CHARACTER IN BUFFER
   209 00000F5E 7411                <1> 	jz	short _K2B		; RETURN IF BUFFER EMPTY
   210 00000F60 9C                  <1> 	pushf				; SAVE ZF FROM TEST
   211 00000F61 E827010000          <1> 	call	_KIO_S_XLAT		; ROUTINE TO XLATE FOR STANDARD CALLS
   212 00000F66 7308                <1> 	jnc	short _K2A	        ; CARRY CLEAR MEANS PASS VALID CODE
   213 00000F68 9D                  <1> 	popf				; INVALID CODE FOR THIS TYPE OF CALL
   214 00000F69 E89A000000          <1> 	call	_K1S			; THROW THE CHARACTER AWAY
   215 00000F6E EBE9                <1> 	jmp	short _K2		; GO LOOK FOR NEXT CHAR, IF ANY
   216                              <1> _K2A:
   217 00000F70 9D                  <1> 	popf				; RESTORE ZF FROM TEST
   218                              <1> _K2B:
   219                              <1> 	; 02/01/2017
   220 00000F71 FA                  <1> 	cli
   221                              <1> 	;; mov	byte [intflg], 0 ;; 15/01/2017
   222                              <1> 	;
   223                              <1> 	;pop	ecx			; RECOVER REGISTER
   224 00000F72 5B                  <1> 	pop	ebx			; RECOVER REGISTER
   225 00000F73 1F                  <1> 	pop	ds			; RECOVER SEGMENT
   226                              <1> 	; (*) 29/05/2016
   227                              <1> 	; (*) retf 4			; THROW AWAY (e)FLAGS
   228 00000F74 7208                <1> 	jc	short _k2d
   229 00000F76 7505                <1> 	jnz	short _k2c
   230 00000F78 804C240840          <1> 	or	byte [esp+8], 01000000b	; set zero flag bit of eflags register
   231                              <1> _k2c:
   232 00000F7D CF                  <1> 	iretd
   233                              <1> _k2d:
   234                              <1> 	; 29/05/2016 -set carry flag on stack-
   235                              <1> 	; [esp] = EIP
   236                              <1> 	; [esp+4] = CS
   237                              <1> 	; [esp+8] = E-FLAGS
   238 00000F7E 804C240801          <1> 	or	byte [esp+8], 1  ; set carry bit of eflags register
   239                              <1> 	; [esp+12] = ESP (user)
   240                              <1> 	; [esp+16] = SS (User)
   241 00000F83 CF                  <1> 	iretd
   242                              <1> 
   243                              <1> 	
   244                              <1> 	; (*) 29/05/2016 - 'ref 4' intruction causes to stack fault
   245                              <1> 	; (OUTER-PRIVILEGE-LEVEL)
   246                              <1> 	; INTEL 80386 PROGRAMMER'S REFERENCE MANUAL 1986
   247                              <1> 	; // RETF instruction:
   248                              <1> 	;
   249                              <1> 	; IF OperandMode=32 THEN
   250                              <1>  	;    Load CS:EIP from stack;
   251                              <1>  	;    Set CS RPL to CPL;
   252                              <1>  	;    Increment eSP by 8 plus the immediate offset if it exists;
   253                              <1>  	;    Load SS:eSP from stack;
   254                              <1>  	; ELSE (* OperandMode=16 *)
   255                              <1>  	;    Load CS:IP from stack;
   256                              <1>  	;    Set CS RPL to CPL;
   257                              <1>  	;    Increment eSP by 4 plus the immediate offset if it exists;
   258                              <1> 	;    Load SS:eSP from stack;
   259                              <1>  	; FI;
   260                              <1> 	;
   261                              <1> 	; //
   262                              <1> 
   263                              <1> 	;-----	SHIFT STATUS
   264                              <1> _K3E:                                   ; GET THE EXTENDED SHIFT STATUS FLAGS
   265 00000F84 8A25[866F0000]      <1> 	mov	ah, [KB_FLAG_1]		; GET SYSTEM SHIFT KEY STATUS
   266 00000F8A 80E404              <1> 	and	ah, SYS_SHIFT		; MASK ALL BUT SYS KEY BIT
   267                              <1> 	;mov	cl, 5			; SHIFT THEW SYSTEMKEY BIT OVER TO
   268                              <1> 	;shl	ah, cl			; BIT 7 POSITION
   269 00000F8D C0E405              <1>         shl	ah, 5
   270 00000F90 A0[866F0000]        <1> 	mov	al, [KB_FLAG_1]		; GET SYSTEM SHIFT STATES BACK
   271 00000F95 2473                <1> 	and	al, 01110011b		; ELIMINATE SYS SHIFT, HOLD_STATE AND INS_SHIFT
   272 00000F97 08C4                <1> 	or	ah, al                  ; MERGE REMAINING BITS INTO AH
   273 00000F99 A0[886F0000]        <1> 	mov	al, [KB_FLAG_3]		; GET RIGHT CTL AND ALT
   274 00000F9E 240C                <1> 	and	al, 00001100b		; ELIMINATE LC_E0 AND LC_E1
   275 00000FA0 08C4                <1> 	or	ah, al			; OR THE SHIFT FLAGS TOGETHER
   276                              <1> _K3:
   277 00000FA2 A0[856F0000]        <1> 	mov	al, [KB_FLAG]		; GET THE SHIFT STATUS FLAGS
   278                              <1> 	;jmp	short _KIO_EXIT		; RETURN TO CALLER
   279 00000FA7 EB83                <1> 	jmp	_KIO_EXIT
   280                              <1> 
   281                              <1> 	;-----	SET TYPAMATIC RATE AND DELAY
   282                              <1> _K300:
   283 00000FA9 3C05                <1> 	cmp	al, 5			; CORRECT FUNCTION CALL?
   284                              <1> 	;jne	short _KIO_EXIT		; NO, RETURN
   285 00000FAB 0F857BFFFFFF        <1>      	jne	_KIO_EXIT
   286 00000FB1 F6C3E0              <1> 	test	bl, 0E0h		; TEST FOR OUT-OF-RANGE RATE
   287 00000FB4 0F8572FFFFFF        <1>         jnz     _KIO_EXIT               ; RETURN IF SO
   288 00000FBA F6C7FC              <1> 	test	BH, 0FCh		; TEST FOR OUT-OF-RANGE DELAY
   289 00000FBD 0F8569FFFFFF        <1>         jnz     _KIO_EXIT               ; RETURN IF SO
   290 00000FC3 B0F3                <1> 	mov	al, KB_TYPA_RD		; COMMAND FOR TYPAMATIC RATE/DELAY		
   291 00000FC5 E8DA060000          <1> 	call	SND_DATA		; SEND TO KEYBOARD	
   292                              <1> 	;mov	cx, 5			; SHIFT COUNT
   293                              <1> 	;shl	bh, cl			; SHIFT DELAY OVER
   294 00000FCA C0E705              <1> 	shl	bh, 5
   295 00000FCD 88D8                <1> 	mov	al, bl			; PUT IN RATE
   296 00000FCF 08F8                <1> 	or	al, bh			; AND DELAY
   297 00000FD1 E8CE060000          <1> 	call	SND_DATA		; SEND TO KEYBOARD	
   298 00000FD6 E951FFFFFF          <1>         jmp     _KIO_EXIT               ; RETURN TO CALLER
   299                              <1> 
   300                              <1> 	;-----	WRITE TO KEYBOARD BUFFER
   301                              <1> _K500:
   302 00000FDB 56                  <1> 	push	esi			; SAVE SI (esi)
   303 00000FDC FA                  <1> 	cli				; 
   304 00000FDD 8B1D[966F0000]      <1>      	mov	ebx, [BUFFER_TAIL]	; GET THE 'IN TO' POINTER TO THE BUFFER
   305 00000FE3 89DE                <1> 	mov	esi, ebx		; SAVE A COPY IN CASE BUFFER NOT FULL
   306 00000FE5 E8D3000000          <1> 	call	_K4			; BUMP THE POINTER TO SEE IF BUFFER IS FULL
   307 00000FEA 3B1D[926F0000]      <1> 	cmp	ebx, [BUFFER_HEAD]	; WILL THE BUFFER OVERRUN IF WE STORE THIS?
   308 00000FF0 740D                <1> 	je	short _K502		; YES - INFORM CALLER OF ERROR		
   309 00000FF2 66890E              <1> 	mov	[esi], cx		; NO - PUT ASCII/SCAN CODE INTO BUFFER	
   310 00000FF5 891D[966F0000]      <1> 	mov	[BUFFER_TAIL], ebx	; ADJUST 'IN TO' POINTER TO REFLECT CHANGE
   311 00000FFB 28C0                <1> 	sub	al, al			; TELL CALLER THAT OPERATION WAS SUCCESSFUL
   312 00000FFD EB02                <1> 	jmp	short _K504		; SUB INSTRUCTION ALSO RESETS CARRY FLAG
   313                              <1> _K502:
   314 00000FFF B001                <1> 	mov	al, 01h			; BUFFER FULL INDICATION
   315                              <1> _K504:
   316 00001001 FB                  <1> 	sti				
   317 00001002 5E                  <1> 	pop	esi			; RECOVER SI (esi)
   318 00001003 E924FFFFFF          <1>         jmp     _KIO_EXIT               ; RETURN TO CALLER WITH STATUS IN AL
   319                              <1> 
   320                              <1> 	;-----	READ THE KEY TO FIGURE OUT WHAT TO DO -----
   321                              <1> _K1S:
   322 00001008 FA                  <1> 	cli	; 03/12/2014
   323 00001009 8B1D[926F0000]      <1>         mov     ebx, [BUFFER_HEAD] 	; GET POINTER TO HEAD OF BUFFER
   324 0000100F 3B1D[966F0000]      <1>         cmp     ebx, [BUFFER_TAIL] 	; TEST END OF BUFFER
   325                              <1> 	;jne	short _K1U		; IF ANYTHING IN BUFFER SKIP INTERRUPT
   326 00001015 750F                <1> 	jne	short _k1x ; 03/12/2014
   327                              <1> 	;
   328                              <1> 	; 03/12/2014
   329                              <1> 	; 28/08/2014
   330                              <1> 	; PERFORM OTHER FUNCTION ?? here !
   331                              <1> 	;; MOV	AX, 9002h		; MOVE IN WAIT CODE & TYPE
   332                              <1> 	;; INT 	15H			; PERFORM OTHER FUNCTION
   333                              <1> _K1T:                                   ; ASCII READ
   334 00001017 FB                  <1> 	sti				; INTERRUPTS BACK ON DURING LOOP
   335 00001018 90                  <1> 	nop				; ALLOW AN INTERRUPT TO OCCUR
   336                              <1> _K1U:	
   337 00001019 FA                  <1> 	cli				; INTERRUPTS BACK OFF
   338 0000101A 8B1D[926F0000]      <1>         mov    	ebx, [BUFFER_HEAD] 	; GET POINTER TO HEAD OF BUFFER
   339 00001020 3B1D[966F0000]      <1>         cmp     ebx, [BUFFER_TAIL] 	; TEST END OF BUFFER
   340                              <1> _k1x:
   341 00001026 53                  <1> 	push	ebx			; SAVE ADDRESS		
   342 00001027 9C                  <1> 	pushf				; SAVE FLAGS
   343 00001028 E82F070000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   344 0000102D 8A1D[876F0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   345 00001033 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   346 00001035 80E307              <1> 	and	bl, 07h	; KB_LEDS	; ISOLATE INDICATOR BITS
   347 00001038 7406                <1> 	jz	short _K1V		; IF NO CHANGE BYPASS UPDATE
   348 0000103A E8C9060000          <1> 	call	SND_LED1
   349 0000103F FA                  <1> 	cli				; DISABLE INTERRUPTS
   350                              <1> _K1V:
   351 00001040 9D                  <1> 	popf				; RESTORE FLAGS
   352 00001041 5B                  <1> 	pop	ebx			; RESTORE ADDRESS
   353 00001042 74D3                <1>         je      short _K1T              ; LOOP UNTIL SOMETHING IN BUFFER
   354                              <1> 	;
   355 00001044 668B03              <1> 	mov	ax, [ebx] 		; GET SCAN CODE AND ASCII CODE
   356 00001047 E871000000          <1>         call    _K4                     ; MOVE POINTER TO NEXT POSITION
   357 0000104C 891D[926F0000]      <1>         mov     [BUFFER_HEAD], ebx      ; STORE VALUE IN VARIABLE
   358 00001052 C3                  <1> 	retn				; RETURN
   359                              <1> 
   360                              <1> 	;-----	READ THE KEY TO SEE IF ONE IS PRESENT -----
   361                              <1> _K2S:
   362 00001053 FA                  <1> 	cli				; INTERRUPTS OFF
   363 00001054 8B1D[926F0000]      <1>         mov     ebx, [BUFFER_HEAD]      ; GET HEAD POINTER
   364 0000105A 3B1D[966F0000]      <1>         cmp     ebx, [BUFFER_TAIL]      ; IF EQUAL (Z=1) THEN NOTHING THERE
   365 00001060 668B03              <1> 	mov	ax, [ebx]
   366 00001063 9C                  <1> 	pushf				; SAVE FLAGS
   367 00001064 6650                <1> 	push	ax			; SAVE CODE
   368 00001066 E8F1060000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   369 0000106B 8A1D[876F0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   370 00001071 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   371 00001073 80E307              <1> 	and	bl, 07h ; KB_LEDS	; ISOLATE INDICATOR BITS
   372 00001076 7405                <1> 	jz	short _K2T		; IF NO CHANGE BYPASS UPDATE
   373 00001078 E874060000          <1> 	call	SND_LED			; GO TURN ON MODE INDICATORS
   374                              <1> _K2T:
   375 0000107D 6658                <1> 	pop	ax			; RESTORE CODE
   376 0000107F 9D                  <1> 	popf				; RESTORE FLAGS
   377 00001080 FB                  <1> 	sti				; INTERRUPTS BACK ON
   378 00001081 C3                  <1> 	retn				; RETURN
   379                              <1> 
   380                              <1> 	;-----	ROUTINE TO TRANSLATE SCAN CODE PAIRS FOR EXTENDED CALLS -----
   381                              <1> _KIO_E_XLAT:
   382 00001082 3CF0                <1> 	cmp	al, 0F0h		; IS IT ONE OF THE FILL-INs?
   383 00001084 7506                <1> 	jne	short _KIO_E_RET	; NO, PASS IT ON
   384 00001086 08E4                <1>         or 	ah, ah			; AH = 0 IS SPECIAL CASE
   385 00001088 7402                <1>         jz	short _KIO_E_RET        ; PASS THIS ON UNCHANGED
   386 0000108A 30C0                <1> 	xor	al, al			; OTHERWISE SET AL = 0
   387                              <1> _KIO_E_RET:				
   388 0000108C C3                  <1> 	retn				; GO BACK
   389                              <1> 
   390                              <1> 	;-----	ROUTINE TO TRANSLATE SCAN CODE PAIRS FOR STANDARD CALLS -----
   391                              <1> _KIO_S_XLAT:
   392 0000108D 80FCE0              <1> 	cmp	ah, 0E0h		; IS IT KEYPAD ENTER OR / ?
   393 00001090 750F                <1> 	jne	short _KIO_S2		; NO, CONTINUE
   394 00001092 3C0D                <1> 	cmp	al, 0Dh			; KEYPAD ENTER CODE?
   395 00001094 7408                <1>         je	short _KIO_S1		; YES, MASSAGE A BIT
   396 00001096 3C0A                <1> 	cmp	al, 0Ah			; CTRL KEYPAD ENTER CODE?
   397 00001098 7404                <1>         je	short _KIO_S1		; YES, MASSAGE THE SAME
   398 0000109A B435                <1> 	mov	ah, 35h			; NO, MUST BE KEYPAD /
   399                              <1> _kio_ret: ; 03/12/2014
   400 0000109C F8                  <1> 	clc
   401 0000109D C3                  <1> 	retn
   402                              <1> 	;jmp	short _KIO_USE		; GIVE TO CALLER
   403                              <1> _KIO_S1:				
   404 0000109E B41C                <1> 	mov	ah, 1Ch			; CONVERT TO COMPATIBLE OUTPUT
   405                              <1> 	;jmp	short _KIO_USE		; GIVE TO CALLER
   406 000010A0 C3                  <1> 	retn
   407                              <1> _KIO_S2:		
   408 000010A1 80FC84              <1> 	cmp	ah, 84h			; IS IT ONE OF EXTENDED ONES?
   409 000010A4 7715                <1> 	ja	short _KIO_DIS		; YES, THROW AWAY AND GET ANOTHER CHAR
   410 000010A6 3CF0                <1> 	cmp	al, 0F0h		; IS IT ONE OF THE FILL-INs?
   411 000010A8 7506                <1>         jne	short _KIO_S3		; NO, TRY LAST TEST
   412 000010AA 08E4                <1> 	or	ah, ah			; AH = 0 IS SPECIAL CASE
   413 000010AC 740C                <1>         jz	short _KIO_USE		; PASS THIS ON UNCHANGED
   414 000010AE EB0B                <1> 	jmp	short _KIO_DIS		; THROW AWAY THE REST
   415                              <1> _KIO_S3:
   416 000010B0 3CE0                <1> 	cmp	al, 0E0h		; IS IT AN EXTENSION OF A PREVIOUS ONE?
   417                              <1> 	;jne	short _KIO_USE		; NO, MUST BE A STANDARD CODE
   418 000010B2 75E8                <1> 	jne	short _kio_ret
   419 000010B4 08E4                <1> 	or	ah, ah			; AH = 0 IS SPECIAL CASE
   420 000010B6 7402                <1>         jz	short _KIO_USE		; JUMP IF AH = 0
   421 000010B8 30C0                <1> 	xor	al, al			; CONVERT TO COMPATIBLE OUTPUT
   422                              <1> 	;jmp	short _KIO_USE		; PASS IT ON TO CALLER
   423                              <1> _KIO_USE:
   424                              <1> 	;clc				; CLEAR CARRY TO INDICATE GOOD CODE
   425 000010BA C3                  <1> 	retn				; RETURN	
   426                              <1> _KIO_DIS:
   427 000010BB F9                  <1> 	stc				; SET CARRY TO INDICATE DISCARD CODE
   428 000010BC C3                  <1> 	retn				; RETURN
   429                              <1> 
   430                              <1> 	;-----	INCREMENT BUFFER POINTER ROUTINE -----
   431                              <1> _K4:    
   432 000010BD 43                  <1> 	inc     ebx
   433 000010BE 43                  <1> 	inc	ebx			; MOVE TO NEXT WORD IN LIST
   434 000010BF 3B1D[8E6F0000]      <1>         cmp     ebx, [BUFFER_END] 	; AT END OF BUFFER?
   435                              <1>         ;jne    short _K5               ; NO, CONTINUE
   436 000010C5 7206                <1> 	jb	short _K5
   437 000010C7 8B1D[8A6F0000]      <1>         mov     ebx, [BUFFER_START]     ; YES, RESET TO BUFFER BEGINNING
   438                              <1> _K5:
   439 000010CD C3                  <1> 	retn
   440                              <1> 
   441                              <1> ; 20/02/2015
   442                              <1> ; 05/12/2014
   443                              <1> ; 26/08/2014
   444                              <1> ; KEYBOARD (HARDWARE) INTERRUPT -  IRQ LEVEL 1
   445                              <1> ; (INT_09h - Retro UNIX 8086 v1 - U9.ASM, 07/03/2014)
   446                              <1> ;
   447                              <1> ; Derived from "KB_INT_1" procedure of IBM "pc-at" 
   448                              <1> ; rombios source code (06/10/1985)
   449                              <1> ; 'keybd.asm', HARDWARE INT 09h - (IRQ Level 1)
   450                              <1> 
   451                              <1> ; EQUATES (IBM PC-XT-286 BIOS, 1986, 'POSQEQU.INC')
   452                              <1> 
   453                              <1> ;--------- 8042 COMMANDS -------------------------------------------------------
   454                              <1> ENA_KBD		equ	0AEh		; ENABLE KEYBOARD COMMAND
   455                              <1> DIS_KBD		equ	0ADh		; DISABLE KEYBOARD COMMAND
   456                              <1> SHUT_CMD	equ	0FEh		; CAUSE A SHUTDOWN COMMAND
   457                              <1> ;--------- 8042 KEYBOARD INTERFACE AND DIAGNOSTIC CONTROL REGISTERS ------------
   458                              <1> STATUS_PORT	equ	064h		; 8042 STATUS PORT
   459                              <1> INPT_BUF_FULL	equ	00000010b 	; 1 = +INPUT BUFFER FULL
   460                              <1> PORT_A		equ	060h		; 8042 KEYBOARD SCAN CODE/CONTROL PORT
   461                              <1> ;---------- 8042 KEYBOARD RESPONSE ---------------------------------------------
   462                              <1> KB_ACK		equ	0FAh		; ACKNOWLEDGE PROM TRANSMISSION
   463                              <1> KB_RESEND	equ	0FEh		; RESEND REQUEST
   464                              <1> KB_OVER_RUN	equ	0FFh		; OVER RUN SCAN CODE
   465                              <1> ;---------- KEYBOARD/LED COMMANDS ----------------------------------------------
   466                              <1> KB_ENABLE	equ	0F4h		; KEYBOARD ENABLE
   467                              <1> LED_CMD		equ	0EDh		; LED WRITE COMMAND
   468                              <1> KB_TYPA_RD	equ	0F3h		; TYPAMATIC RATE/DELAY COMMAND
   469                              <1> ;---------- KEYBOARD SCAN CODES ------------------------------------------------
   470                              <1> NUM_KEY		equ	69		; SCAN CODE FOR	 NUMBER LOCK KEY
   471                              <1> SCROLL_KEY	equ	70		; SCAN CODE FOR	 SCROLL LOCK KEY
   472                              <1> ALT_KEY		equ	56		; SCAN CODE FOR	 ALTERNATE SHIFT KEY
   473                              <1> CTL_KEY		equ	29		; SCAN CODE FOR	 CONTROL KEY
   474                              <1> CAPS_KEY	equ	58		; SCAN CODE FOR	 SHIFT LOCK KEY
   475                              <1> DEL_KEY		equ	83		; SCAN CODE FOR	 DELETE KEY
   476                              <1> INS_KEY		equ	82		; SCAN CODE FOR	 INSERT KEY
   477                              <1> LEFT_KEY	equ	42		; SCAN CODE FOR	 LEFT SHIFT
   478                              <1> RIGHT_KEY	equ	54		; SCAN CODE FOR	 RIGHT SHIFT
   479                              <1> SYS_KEY		equ	84		; SCAN CODE FOR	 SYSTEM KEY
   480                              <1> ;---------- ENHANCED KEYBOARD SCAN CODES ---------------------------------------
   481                              <1> ID_1		equ	0ABh		; 1ST ID CHARACTER FOR KBX
   482                              <1> ID_2		equ	041h		; 2ND ID CHARACTER FOR KBX
   483                              <1> ID_2A		equ	054h		; ALTERNATE 2ND ID CHARACTER FOR KBX
   484                              <1> F11_M		equ	87		; F11 KEY MAKE
   485                              <1> F12_M		equ	88		; F12 KEY MAKE
   486                              <1> MC_E0		equ	224		; GENERAL MARKER CODE
   487                              <1> MC_E1		equ	225		; PAUSE KEY MARKER CODE
   488                              <1> ;---------- FLAG EQUATES WITHIN @KB_FLAG----------------------------------------
   489                              <1> RIGHT_SHIFT	equ	00000001b	; RIGHT SHIFT KEY DEPRESSED
   490                              <1> LEFT_SHIFT	equ	00000010b	; LEFT SHIFT KEY DEPRESSED
   491                              <1> CTL_SHIFT	equ	00000100b	; CONTROL SHIFT KEY DEPRESSED
   492                              <1> ALT_SHIFT	equ	00001000b	; ALTERNATE SHIFT KEY DEPRESSED
   493                              <1> SCROLL_STATE	equ	00010000b	; SCROLL LOCK STATE IS ACTIVE
   494                              <1> NUM_STATE	equ	00100000b	; NUM LOCK STATE IS ACTIVE
   495                              <1> CAPS_STATE	equ	01000000b	; CAPS LOCK STATE IS ACTIVE
   496                              <1> INS_STATE	equ	10000000b	; INSERT STATE IS ACTIVE
   497                              <1> ;---------- FLAG EQUATES WITHIN	@KB_FLAG_1 -------------------------------------
   498                              <1> L_CTL_SHIFT	equ	00000001b	; LEFT CTL KEY DOWN
   499                              <1> L_ALT_SHIFT	equ	00000010b	; LEFT ALT KEY DOWN
   500                              <1> SYS_SHIFT	equ	00000100b	; SYSTEM KEY DEPRESSED AND HELD
   501                              <1> HOLD_STATE	equ	00001000b	; SUSPEND KEY HAS BEEN TOGGLED
   502                              <1> SCROLL_SHIFT	equ	00010000b	; SCROLL LOCK KEY IS DEPRESSED
   503                              <1> NUM_SHIFT	equ	00100000b	; NUM LOCK KEY IS DEPRESSED
   504                              <1> CAPS_SHIFT	equ	01000000b	; CAPS LOCK KEY IS DEPRE55ED
   505                              <1> INS_SHIFT	equ	10000000b	; INSERT KEY IS DEPRESSED
   506                              <1> ;---------- FLAGS EQUATES WITHIN @KB_FLAG_2 -----------------------------------
   507                              <1> KB_LEDS		equ	00000111b	; KEYBOARD LED STATE BITS
   508                              <1> ;		equ	00000001b	; SCROLL LOCK INDICATOR
   509                              <1> ;		equ	00000010b	; NUM LOCK INDICATOR
   510                              <1> ;		equ	00000100b	; CAPS LOCK INDICATOR
   511                              <1> ;		equ	00001000b	; RESERVED (MUST BE ZERO)
   512                              <1> KB_FA		equ	00010000b	; ACKNOWLEDGMENT RECEIVED
   513                              <1> KB_FE		equ	00100000b	; RESEND RECEIVED FLAG
   514                              <1> KB_PR_LED	equ	01000000b	; MODE INDICATOR UPDATE
   515                              <1> KB_ERR		equ	10000000b	; KEYBOARD TRANSMIT ERROR FLAG
   516                              <1> ;----------- FLAGS EQUATES WITHIN @KB_FLAG_3 -----------------------------------
   517                              <1> LC_E1		equ	00000001b	; LAST CODE WAS THE E1 HIDDEN CODE
   518                              <1> LC_E0		equ	00000010b	; LAST CODE WAS THE E0 HIDDEN CODE
   519                              <1> R_CTL_SHIFT	equ	00000100b	; RIGHT CTL KEY DOWN
   520                              <1> R_ALT_SHIFT	equ	00001000b	; RIGHT ALT KEY DOWN
   521                              <1> GRAPH_ON	equ	00001000b	; ALT GRAPHICS KEY DOWN (WT ONLY)	
   522                              <1> KBX		equ	00010000b	; ENHANCED KEYBOARD INSTALLED
   523                              <1> SET_NUM_LK	equ	00100000b	; FORCE NUM LOCK IF READ ID AND KBX
   524                              <1> LC_AB		equ	01000000b	; LAST CHARACTER WAS FIRST ID CHARACTER
   525                              <1> RD_ID		equ	10000000b	; DOING A READ ID (MUST BE BIT0)
   526                              <1> ;
   527                              <1> ;----------- INTERRUPT EQUATES -------------------------------------------------
   528                              <1> EOI		equ	020h		; END OF INTERRUPT COMMAND TO 8259
   529                              <1> INTA00		equ	020h		; 8259 PORT
   530                              <1> 
   531                              <1> 
   532                              <1> kb_int:
   533                              <1> 
   534                              <1> ; 17/10/2015 ('ctrlbrk') 
   535                              <1> ; 05/12/2014
   536                              <1> ; 04/12/2014 (derived from pc-xt-286 bios source code -1986-)
   537                              <1> ; 26/08/2014
   538                              <1> ;
   539                              <1> ; 03/06/86  KEYBOARD BIOS
   540                              <1> ;
   541                              <1> ;--- HARDWARE INT 09H -- (IRQ LEVEL 1) ------------------------------------------
   542                              <1> ;										;
   543                              <1> ;	KEYBOARD INTERRUPT ROUTINE						;
   544                              <1> ;										;
   545                              <1> ;--------------------------------------------------------------------------------
   546                              <1> 
   547                              <1> KB_INT_1:
   548 000010CE FB                  <1> 	sti				; ENABLE INTERRUPTS
   549                              <1> 	;push	ebp
   550 000010CF 50                  <1> 	push	eax
   551 000010D0 53                  <1> 	push	ebx
   552 000010D1 51                  <1> 	push	ecx
   553 000010D2 52                  <1> 	push	edx
   554 000010D3 56                  <1> 	push	esi
   555 000010D4 57                  <1> 	push	edi
   556 000010D5 1E                  <1> 	push	ds
   557 000010D6 06                  <1> 	push	es
   558 000010D7 FC                  <1> 	cld				; FORWARD DIRECTION
   559 000010D8 66B81000            <1> 	mov	ax, KDATA
   560 000010DC 8ED8                <1> 	mov	ds, ax
   561 000010DE 8EC0                <1> 	mov	es, ax
   562                              <1> 	;
   563                              <1> 	;-----	WAIT FOR KEYBOARD DISABLE COMMAND TO BE ACCEPTED
   564 000010E0 B0AD                <1> 	mov	al, DIS_KBD		; DISABLE THE KEYBOARD COMMAND
   565 000010E2 E8A9050000          <1> 	call	SHIP_IT			; EXECUTE DISABLE
   566 000010E7 FA                  <1> 	cli				; DISABLE INTERRUPTS
   567 000010E8 B900000100          <1> 	mov	ecx, 10000h		; SET MAXIMUM TIMEOUT
   568                              <1> KB_INT_01:
   569 000010ED E464                <1> 	in	al, STATUS_PORT		; READ ADAPTER STATUS
   570 000010EF A802                <1> 	test	al, INPT_BUF_FULL	; CHECK INPUT BUFFER FULL STATUS BIT
   571 000010F1 E0FA                <1> 	loopnz	KB_INT_01		; WAIT FOR COMMAND TO BE ACCEPTED
   572                              <1> 	;
   573                              <1> 	;-----	READ CHARACTER FROM KEYBOARD INTERFACE
   574 000010F3 E460                <1> 	in	al, PORT_A		; READ IN THE CHARACTER
   575                              <1> 	;
   576                              <1> 	;-----	SYSTEM HOOK INT 15H - FUNCTION 4FH (ON HARDWARE INT LEVEL 9H) 	
   577                              <1> 	;MOV	AH, 04FH		; SYSTEM INTERCEPT - KEY CODE FUNCTION
   578                              <1> 	;STC				; SET CY=1 (IN CASE OF IRET)
   579                              <1> 	;INT	15H			; CASETTE CALL (AL)=KEY SCAN CODE
   580                              <1> 	;				; RETURNS CY=1 FOR INVALID FUNCTION
   581                              <1> 	;JC	KB_INT_02		; CONTINUE IF CARRY FLAG SET ((AL)=CODE)
   582                              <1> 	;JMP	K26			; EXIT IF SYSTEM HANDLES SCAN CODE
   583                              <1> 	;				; EXT HANDLES HARDWARE EOI AND ENABLE		
   584                              <1> 	;
   585                              <1> 	;-----	CHECK FOR A RESEND COMMAND TO KEYBOARD
   586                              <1> KB_INT_02:				; 	  (AL)= SCAN CODE
   587 000010F5 FB                  <1> 	sti				; ENABLE INTERRUPTS AGAIN
   588 000010F6 3CFE                <1> 	cmp	al, KB_RESEND		; IS THE INPUT A RESEND
   589 000010F8 7411                <1>         je      short KB_INT_4          ; GO IF RESEND
   590                              <1> 	;
   591                              <1> 	;-----	CHECK FOR RESPONSE TO A COMMAND TO KEYBOARD
   592 000010FA 3CFA                <1> 	cmp	al, KB_ACK		; IS THE INPUT AN ACKNOWLEDGE
   593 000010FC 751A                <1>         jne     short KB_INT_2          ; GO IF NOT
   594                              <1> 	;
   595                              <1> 	;-----	A COMMAND TO THE KEYBOARD WAS ISSUED
   596 000010FE FA                  <1> 	cli				; DISABLE INTERRUPTS
   597 000010FF 800D[876F0000]10    <1> 	or	byte [KB_FLAG_2], KB_FA ; INDICATE ACK RECEIVED
   598 00001106 E97A020000          <1>         jmp     K26                     ; RETURN IF NOT (ACK RETURNED FOR DATA)
   599                              <1> 	;
   600                              <1> 	;-----	RESEND THE LAST BYTE
   601                              <1> KB_INT_4:
   602 0000110B FA                  <1> 	cli				; DISABLE INTERRUPTS
   603 0000110C 800D[876F0000]20    <1> 	or	byte [KB_FLAG_2], KB_FE ; INDICATE RESEND RECEIVED
   604 00001113 E96D020000          <1>         jmp     K26                     ; RETURN IF NOT ACK RETURNED FOR DATA)
   605                              <1> 	;
   606                              <1> ;-----	UPDATE MODE INDICATORS IF CHANGE IN STATE
   607                              <1> KB_INT_2:
   608 00001118 6650                <1> 	push 	ax			; SAVE DATA IN
   609 0000111A E83D060000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   610 0000111F 8A1D[876F0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   611 00001125 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   612 00001127 80E307              <1> 	and	bl, KB_LEDS		; ISOLATE INDICATOR BITS
   613 0000112A 7405                <1> 	jz	short UP0		; IF NO CHANGE BYPASS UPDATE
   614 0000112C E8C0050000          <1> 	call	SND_LED			; GO TURN ON MODE INDICATORS
   615                              <1> UP0:
   616 00001131 6658                <1> 	pop	ax			; RESTORE DATA IN
   617                              <1> ;------------------------------------------------------------------------
   618                              <1> ;	START OF KEY PROCESSING						;
   619                              <1> ;------------------------------------------------------------------------
   620 00001133 88C4                <1> 	mov	ah, al			; SAVE SCAN CODE IN AH ALSO
   621                              <1> 	;
   622                              <1> 	;-----	TEST FOR OVERRUN SCAN CODE FROM KEYBOARD
   623 00001135 3CFF                <1> 	cmp	al, KB_OVER_RUN		; IS THIS AN OVERRUN CHAR
   624 00001137 0F843F050000        <1>         je      K62			; BUFFER_FULL_BEEP
   625                              <1> 	;
   626                              <1> K16:	
   627 0000113D 8A3D[886F0000]      <1> 	mov	bh, [KB_FLAG_3]		; LOAD FLAGS FOR TESTING
   628                              <1> 	;
   629                              <1> 	;-----	TEST TO SEE IF A READ_ID IS IN PROGRESS
   630 00001143 F6C7C0              <1> 	test 	bh, RD_ID+LC_AB 	; ARE WE DOING A READ ID?
   631 00001146 7449                <1> 	jz	short NOT_ID		; CONTINUE IF NOT
   632 00001148 7917                <1> 	jns	short TST_ID_2		; IS THE RD_ID FLAG ON?
   633 0000114A 3CAB                <1> 	cmp	al, ID_1		; IS THIS THE 1ST ID CHARACTER?
   634 0000114C 7507                <1> 	jne	short RST_RD_ID
   635 0000114E 800D[886F0000]40    <1> 	or	byte [KB_FLAG_3], LC_AB ; INDICATE 1ST ID WAS OK
   636                              <1> RST_RD_ID:
   637 00001155 8025[886F0000]7F    <1> 	and	byte [KB_FLAG_3], ~RD_ID ; RESET THE READ ID FLAG
   638                              <1>         ;jmp    short ID_EX		; AND EXIT
   639 0000115C E924020000          <1> 	jmp	K26
   640                              <1> 	;
   641                              <1> TST_ID_2:
   642 00001161 8025[886F0000]BF    <1> 	and	byte [KB_FLAG_3], ~LC_AB ; RESET FLAG
   643 00001168 3C54                <1> 	cmp	al, ID_2A		; IS THIS THE 2ND ID CHARACTER?
   644 0000116A 7419                <1>         je	short KX_BIT		; JUMP IF SO
   645 0000116C 3C41                <1> 	cmp	al, ID_2		; IS THIS THE 2ND ID CHARACTER?
   646                              <1>         ;jne	short ID_EX		; LEAVE IF NOT
   647 0000116E 0F8511020000        <1> 	jne	K26
   648                              <1> 	;
   649                              <1> 	;-----	A READ ID SAID THAT IT WAS ENHANCED KEYBOARD
   650 00001174 F6C720              <1> 	test	bh, SET_NUM_LK 		; SHOULD WE SET NUM LOCK?
   651 00001177 740C                <1>         jz      short KX_BIT		; EXIT IF NOT
   652 00001179 800D[856F0000]20    <1> 	or	byte [KB_FLAG], NUM_STATE ; FORCE NUM LOCK ON
   653 00001180 E86C050000          <1> 	call	SND_LED			; GO SET THE NUM LOCK INDICATOR
   654                              <1> KX_BIT:
   655 00001185 800D[886F0000]10    <1> 	or	byte [KB_FLAG_3], KBX	; INDICATE ENHANCED KEYBOARD WAS FOUND
   656 0000118C E9F4010000          <1> ID_EX:	jmp     K26			; EXIT
   657                              <1> 	;
   658                              <1> NOT_ID:
   659 00001191 3CE0                <1> 	cmp	al, MC_E0		; IS THIS THE GENERAL MARKER CODE?
   660 00001193 750C                <1> 	jne	short TEST_E1
   661 00001195 800D[886F0000]12    <1> 	or	byte [KB_FLAG_3], LC_E0+KBX ; SET FLAG BIT, SET KBX, AND
   662                              <1> 	;jmp	short EXIT		; THROW AWAY THIS CODE
   663 0000119C E9EB010000          <1> 	jmp	K26A	
   664                              <1> TEST_E1:	
   665 000011A1 3CE1                <1> 	cmp	al, MC_E1		; IS THIS THE PAUSE KEY?
   666 000011A3 750C                <1> 	jne	short NOT_HC
   667 000011A5 800D[886F0000]11    <1> 	or	byte [KB_FLAG_3], LC_E1+KBX ; SET FLAG BIT, SET KBX, AND
   668 000011AC E9DB010000          <1> EXIT:	jmp	K26A			; THROW AWAY THIS CODE
   669                              <1> 	;
   670                              <1> NOT_HC:
   671 000011B1 247F                <1> 	and	al, 07Fh		; TURN OFF THE BREAK BIT
   672 000011B3 F6C702              <1> 	test	bh, LC_E0		; LAST CODE THE E0 MARKER CODE
   673 000011B6 7414                <1> 	jz	short NOT_LC_E0		; JUMP IF NOT
   674                              <1> 	;
   675 000011B8 BF[726E0000]        <1> 	mov	edi, _K6+6		; IS THIS A SHIFT KEY?
   676 000011BD AE                  <1> 	scasb
   677 000011BE 0F84C1010000        <1>         je      K26 ; K16B              ; YES, THROW AWAY & RESET FLAG
   678 000011C4 AE                  <1> 	scasb
   679 000011C5 757C                <1> 	jne	short K16A		; NO, CONTINUE KEY PROCESSING
   680                              <1> 	;jmp	short K16B		; YES, THROW AWAY & RESET FLAG
   681 000011C7 E9B9010000          <1> 	jmp	K26
   682                              <1> 	;
   683                              <1> NOT_LC_E0:
   684 000011CC F6C701              <1> 	test	bh, LC_E1		; LAST CODE THE E1 MARKER CODE?
   685 000011CF 7435                <1> 	jz	short T_SYS_KEY		; JUMP IF NOT
   686 000011D1 B904000000          <1> 	mov	ecx, 4			; LENGHT OF SEARCH
   687 000011D6 BF[706E0000]        <1> 	mov	edi, _K6+4		; IS THIS AN ALT, CTL, OR SHIFT?
   688 000011DB F2AE                <1> 	repne	scasb			; CHECK IT
   689                              <1> 	;je	short EXIT		; THROW AWAY IF SO
   690 000011DD 0F84A9010000        <1> 	je	K26A			
   691                              <1> 	;
   692 000011E3 3C45                <1> 	cmp	al, NUM_KEY		; IS IT THE PAUSE KEY?
   693                              <1> 	;jne	short K16B		; NO, THROW AWAY & RESET FLAG
   694 000011E5 0F859A010000        <1> 	jne	K26
   695 000011EB F6C480              <1> 	test	ah, 80h			; YES, IS IT THE BREAK OF THE KEY?
   696                              <1> 	;jnz	short K16B		; YES, THROW THIS AWAY, TOO	
   697 000011EE 0F8591010000        <1> 	jnz	K26
   698                              <1>         ; 20/02/2015 
   699 000011F4 F605[866F0000]08    <1> 	test	byte [KB_FLAG_1],HOLD_STATE ;  NO, ARE WE PAUSED ALREADY?
   700                              <1> 	;jnz	short K16B		;  YES, THROW AWAY
   701 000011FB 0F8584010000        <1> 	jnz	K26
   702 00001201 E9E1020000          <1> 	jmp     K39P                    ; NO, THIS IS THE REAL PAUSE STATE
   703                              <1> 	;
   704                              <1> 	;-----	TEST FOR SYSTEM KEY
   705                              <1> T_SYS_KEY:
   706 00001206 3C54                <1> 	cmp	al, SYS_KEY		; IS IT THE SYSTEM KEY?
   707 00001208 7539                <1> 	jnz	short K16A		; CONTINUE IF NOT
   708                              <1> 	;
   709 0000120A F6C480              <1> 	test	ah, 80h			; CHECK IF THIS A BREAK CODE
   710 0000120D 7524                <1> 	jnz	short K16C		; DO NOT TOUCH SYSTEM INDICATOR IF TRUE
   711                              <1> 	;
   712 0000120F F605[866F0000]04    <1> 	test	byte [KB_FLAG_1], SYS_SHIFT ; SEE IF IN SYSTEM KEY HELD DOWN 
   713                              <1>         ;jnz	short K16B		; IF YES, DO NOT PROCESS SYSTEM INDICATOR	
   714 00001216 0F8569010000        <1> 	jnz     K26			
   715                              <1> 	;
   716 0000121C 800D[866F0000]04    <1> 	or	byte [KB_FLAG_1], SYS_SHIFT ; INDICATE SYSTEM KEY DEPRESSED
   717 00001223 B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   718 00001225 E620                <1> 	out	20h, al ;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
   719                              <1> 					; INTERRUPT-RETURN-NO-EOI
   720 00001227 B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
   721 00001229 E862040000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
   722                              <1> 	; !!! SYSREQ !!! function/system call (INTERRUPT) must be here !!!
   723                              <1> 	;MOV	AL, 8500H		; FUNCTION VALUE FOR MAKE OF SYSTEM KEY
   724                              <1> 	;STI				; MAKE SURE INTERRUPTS ENABLED
   725                              <1> 	;INT	15H			; USER INTERRUPT	
   726 0000122E E965010000          <1>         jmp     K27A                    ; END PROCESSING
   727                              <1> 	;
   728                              <1> ;K16B:	jmp	K26			; IGNORE SYSTEM KEY
   729                              <1> 	;
   730                              <1> K16C:
   731 00001233 8025[866F0000]FB    <1> 	and	byte [KB_FLAG_1], ~SYS_SHIFT ; TURN OFF SHIFT KEY HELD DOWN
   732 0000123A B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   733 0000123C E620                <1> 	out	20h, al ;out INTA00, al ; SEND COMMAND TO INTERRUPT CONTROL PORT
   734                              <1> 					; INTERRUPT-RETURN-NO-EOI
   735                              <1> 	;MOV	AL, ENA_KBD		; INSURE KEYBOARD IS ENABLED
   736                              <1> 	;CALL	SHIP_IT			; EXECUTE ENABLE
   737                              <1> 	;
   738                              <1> 	;MOV	AX, 8501H		; FUNCTION VALUE FOR BREAK OF SYSTEM KEY
   739                              <1> 	;STI				; MAKE SURE INTERRUPTS ENABLED
   740                              <1> 	;INT	15H			; USER INTERRUPT
   741                              <1> 	;JMP	K27A			; INGONRE SYSTEM KEY				
   742                              <1> 	;
   743 0000123E E94E010000          <1> 	jmp     K27			; IGNORE SYSTEM KEY
   744                              <1> 	;
   745                              <1> 	;-----	TEST FOR SHIFT KEYS
   746                              <1> K16A:
   747 00001243 8A1D[856F0000]      <1> 	mov	bl, [KB_FLAG]		; PUT STATE FLAGS IN BL
   748 00001249 BF[6C6E0000]        <1> 	mov	edi, _K6		; SHIFT KEY TABLE offset
   749 0000124E B908000000          <1> 	mov	ecx, _K6L		; LENGTH
   750 00001253 F2AE                <1> 	repne	scasb			; LOOK THROUGH THE TABLE FOR A MATCH
   751 00001255 88E0                <1> 	mov	al, ah			; RECOVER SCAN CODE
   752 00001257 0F8510010000        <1>         jne     K25                     ; IF NO MATCH, THEN SHIFT NOT FOUND
   753                              <1> 	;
   754                              <1> 	;------	SHIFT KEY FOUND
   755                              <1> K17:
   756 0000125D 81EF[6D6E0000]      <1>         sub     edi, _K6+1              ; ADJUST PTR TO SCAN CODE MATCH
   757 00001263 8AA7[746E0000]      <1>        	mov     ah, [edi+_K7]       	; GET MASK INTO AH
   758 00001269 B102                <1> 	mov	cl, 2			; SETUP COUNT FOR FLAG SHIFTS
   759 0000126B A880                <1> 	test	al, 80h			; TEST FOR BREAK KEY
   760 0000126D 0F8596000000        <1>         jnz     K23                     ; JUMP OF BREAK
   761                              <1> 	;
   762                              <1> 	;-----	SHIFT MAKE FOUND, DETERMINE SET OR TOGGLE
   763                              <1> K17C:
   764 00001273 80FC10              <1> 	cmp	ah, SCROLL_SHIFT
   765 00001276 732B                <1> 	jae	short K18		; IF SCROLL SHIFT OR ABOVE, TOGGLE KEY
   766                              <1> 	;
   767                              <1> 	;-----	PLAIN SHIFT KEY, SET SHIFT ON
   768 00001278 0825[856F0000]      <1> 	or	[KB_FLAG], ah		; TURN ON SHIFT BIT
   769 0000127E A80C                <1>         test	al, CTL_SHIFT+ALT_SHIFT ; IS IT ALT OR CTRL?
   770                              <1> 	;jnz	short K17D		; YES, MORE FLAGS TO SET
   771 00001280 0F84FF000000        <1> 	jz	K26			; NO, INTERRUPT RETURN
   772                              <1> K17D:
   773 00001286 F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OF NEW KEYS?
   774 00001289 740B                <1> 	jz 	short K17E		; NO, JUMP
   775 0000128B 0825[886F0000]      <1> 	or	[KB_FLAG_3], ah		; SET BITS FOR RIGHT CTRL, ALT
   776 00001291 E9EF000000          <1> 	jmp	K26			; INTERRUPT RETURN
   777                              <1> K17E:
   778 00001296 D2EC                <1> 	shr	ah, cl			; MOVE FLAG BITS TWO POSITIONS
   779 00001298 0825[866F0000]      <1> 	or	[KB_FLAG_1], ah		; SET BITS FOR LEFT CTRL, ALT
   780 0000129E E9E2000000          <1> 	jmp	K26
   781                              <1> 	;
   782                              <1> 	;-----	TOGGLED SHIFT KEY, TEST FOR 1ST MAKE OR NOT
   783                              <1> K18:					; SHIFT-TOGGLE
   784 000012A3 F6C304              <1> 	test	bl, CTL_SHIFT 		; CHECK CTL SHIFT STATE
   785                              <1>         ;jz    	short K18A              ; JUMP IF NOT CTL STATE
   786 000012A6 0F85C1000000        <1>         jnz     K25                     ; JUMP IF CTL STATE
   787                              <1> K18A:
   788 000012AC 3C52                <1> 	cmp	al, INS_KEY		; CHECK FOR INSERT KEY
   789 000012AE 7524                <1> 	jne	short K22		; JUMP IF NOT INSERT KEY
   790 000012B0 F6C308              <1> 	test	bl, ALT_SHIFT 		; CHECK FOR ALTERNATE SHIFT
   791                              <1>       	;jz	short K18B		; JUMP IF NOT ALTERNATE SHIFT	
   792 000012B3 0F85B4000000        <1>         jnz     K25                     ; JUMP IF ALTERNATE SHIFT
   793                              <1> K18B:
   794 000012B9 F6C702              <1> 	test	bh, LC_E0 ;20/02/2015	; IS THIS NEW INSERT KEY?
   795 000012BC 7516                <1> 	jnz	short K22		; YES, THIS ONE'S NEVER A '0'
   796                              <1> K19:	
   797 000012BE F6C320              <1> 	test	bl, NUM_STATE 		; CHECK FOR BASE STATE
   798 000012C1 750C                <1> 	jnz	short K21		; JUMP IF NUM LOCK IS ON
   799 000012C3 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; TEST FOR SHIFT STATE
   800 000012C6 740C                <1> 	jz	short K22		; JUMP IF BASE STATE
   801                              <1> K20:					; NUMERIC ZERO, NOT INSERT KEY
   802 000012C8 88C4                <1> 	mov	ah, al			; PUT SCAN CODE BACK IN AH
   803 000012CA E99E000000          <1>         jmp     K25                     ; NUMERAL '0', STNDRD. PROCESSING
   804                              <1> K21:					; MIGHT BE NUMERIC
   805 000012CF F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT
   806 000012D2 74F4                <1> 	jz	short K20		; IS NUMERIC, STD. PROC.
   807                              <1> 	;
   808                              <1> K22:					; SHIFT TOGGLE KEY HIT; PROCESS IT
   809 000012D4 8425[866F0000]      <1> 	test	ah, [KB_FLAG_1] 	; IS KEY ALREADY DEPRESSED
   810 000012DA 0F85A5000000        <1>         jnz     K26                     ; JUMP IF KEY ALREADY DEPRESSED
   811                              <1> K22A:
   812 000012E0 0825[866F0000]      <1>         or      [KB_FLAG_1], ah 	; INDICATE THAT THE KEY IS DEPRESSED
   813 000012E6 3025[856F0000]      <1> 	xor	[KB_FLAG], ah		; TOGGLE THE SHIFT STATE
   814                              <1> 	;
   815                              <1> 	;-----	TOGGLE LED IF CAPS, NUM  OR SCROLL KEY DEPRESSED
   816 000012EC F6C470              <1> 	test	ah, CAPS_SHIFT+NUM_SHIFT+SCROLL_SHIFT ; SHIFT TOGGLE?
   817 000012EF 7409                <1> 	jz	short K22B		; GO IF NOT
   818                              <1> 	;
   819 000012F1 6650                <1> 	push	ax			; SAVE SCAN CODE AND SHIFT MASK
   820 000012F3 E8F9030000          <1> 	call	SND_LED			; GO TURN MODE INDICATORS ON
   821 000012F8 6658                <1> 	pop	ax			; RESTORE SCAN CODE
   822                              <1> K22B:
   823 000012FA 3C52                <1> 	cmp	al, INS_KEY		; TEST FOR 1ST MAKE OF INSERT KEY
   824 000012FC 0F8583000000        <1>         jne     K26                     ; JUMP IF NOT INSERT KEY
   825 00001302 88C4                <1> 	mov	ah, al		        ; SCAN CODE IN BOTH HALVES OF AX
   826 00001304 E999000000          <1>         jmp     K28                     ; FLAGS UPDATED, PROC. FOR BUFFER
   827                              <1> 	;
   828                              <1> 	;-----	BREAK SHIFT FOUND
   829                              <1> K23:					; BREAK-SHIFT-FOUND
   830 00001309 80FC10              <1> 	cmp	ah, SCROLL_SHIFT	; IS THIS A TOGGLE KEY
   831 0000130C F6D4                <1> 	not	ah			; INVERT MASK
   832 0000130E 7355                <1> 	jae	short K24		; YES, HANDLE BREAK TOGGLE
   833 00001310 2025[856F0000]      <1> 	and	[KB_FLAG], ah		; TURN OFF SHIFT BIT
   834 00001316 80FCFB              <1> 	cmp	ah, ~CTL_SHIFT		; IS THIS ALT OR CTL?
   835 00001319 7730                <1> 	ja	short K23D		; NO, ALL DONE
   836                              <1> 	;
   837 0000131B F6C702              <1> 	test	bh, LC_E0		; 2ND ALT OR CTL?
   838 0000131E 7408                <1> 	jz	short K23A		; NO, HANSLE NORMALLY
   839 00001320 2025[886F0000]      <1> 	and 	[KB_FLAG_3], ah		; RESET BIT FOR RIGHT ALT OR CTL
   840 00001326 EB08                <1> 	jmp	short K23B		; CONTINUE
   841                              <1> K23A:
   842 00001328 D2FC                <1> 	sar	ah, cl			; MOVE THE MASK BIT TWO POSITIONS
   843 0000132A 2025[866F0000]      <1> 	and	[KB_FLAG_1], ah		; RESET BIT FOR LEFT ALT AND CTL
   844                              <1> K23B:
   845 00001330 88C4                <1> 	mov	ah, al			; SAVE SCAN CODE
   846 00001332 A0[886F0000]        <1> 	mov	al, [KB_FLAG_3]		; GET RIGHT ALT & CTRL FLAGS
   847 00001337 D2E8                <1> 	shr	al, cl			; MOVE TO BITS 1 & 0
   848 00001339 0A05[866F0000]      <1> 	or	al, [KB_FLAG_1]		; PUT IN LEFT ALT & CTL FLAGS
   849 0000133F D2E0                <1> 	shl	al, cl			; MOVE BACK TO BITS 3 & 2
   850 00001341 240C                <1> 	and	al, ALT_SHIFT+CTL_SHIFT ; FILTER OUT OTHER GARBAGE
   851 00001343 0805[856F0000]      <1> 	or	[KB_FLAG], al		; PUT RESULT IN THE REAL FLAGS	
   852 00001349 88E0                <1> 	mov	al, ah
   853                              <1> K23D:
   854 0000134B 3CB8                <1> 	cmp	al, ALT_KEY+80h		; IS THIS ALTERNATE SHIFT RELEASE
   855 0000134D 7536                <1> 	jne	short K26		; INTERRUPT RETURN
   856                              <1> 	;	
   857                              <1> 	;-----	ALTERNATE SHIFT KEY RELEASED, GET THE VALUE INTO BUFFER
   858 0000134F A0[896F0000]        <1> 	mov	al, [ALT_INPUT]
   859 00001354 B400                <1> 	mov	ah, 0			; SCAN CODE OF 0
   860 00001356 8825[896F0000]      <1> 	mov	[ALT_INPUT], ah 	; ZERO OUT THE FIELD
   861 0000135C 3C00                <1> 	cmp	al, 0			; WAS THE INPUT = 0?
   862 0000135E 7425                <1> 	je	short K26		; INTERRUPT_RETURN
   863                              <1>         ; 29/01/2016
   864                              <1> 	;jmp     K61                    ; IT WASN'T, SO PUT IN BUFFER
   865 00001360 E9D0020000          <1> 	jmp	_K60
   866                              <1> 	;
   867                              <1> K24:					; BREAK-TOGGLE
   868 00001365 2025[866F0000]      <1> 	and	[KB_FLAG_1], ah 	; INDICATE NO LONGER DEPRESSED
   869 0000136B EB18                <1> 	jmp	short K26		; INTERRUPT_RETURN
   870                              <1> 	;
   871                              <1> 	;-----	TEST FOR HOLD STATE
   872                              <1> 					; AL, AH = SCAN CODE
   873                              <1> K25:					; NO-SHIFT-FOUND
   874 0000136D 3C80                <1> 	cmp	al, 80h			; TEST FOR BREAK KEY
   875 0000136F 7314                <1> 	jae	short K26		; NOTHING FOR BREAK CHARS FROM HERE ON
   876 00001371 F605[866F0000]08    <1> 	test	byte [KB_FLAG_1], HOLD_STATE ; ARE WE IN HOLD STATE
   877 00001378 7428                <1> 	jz	short K28		; BRANCH AROUND TEST IF NOT
   878 0000137A 3C45                <1> 	cmp	al, NUM_KEY
   879 0000137C 7407                <1> 	je	short K26		; CAN'T END HOLD ON NUM_LOCK
   880 0000137E 8025[866F0000]F7    <1> 	and	byte [KB_FLAG_1], ~HOLD_STATE ; TURN OFF THE HOLD STATE BIT
   881                              <1> 	;
   882                              <1> K26:
   883 00001385 8025[886F0000]FC    <1> 	and	byte [KB_FLAG_3], ~(LC_E0+LC_E1) ; RESET LAST CHAR H.C. FLAG
   884                              <1> K26A:					; INTERRUPT-RETURN
   885 0000138C FA                  <1> 	cli				; TURN OFF INTERRUPTS
   886 0000138D B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   887 0000138F E620                <1> 	out	20h, al	;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
   888                              <1> K27:					; INTERRUPT-RETURN-NO-EOI
   889 00001391 B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
   890 00001393 E8F8020000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
   891                              <1> K27A:
   892 00001398 FA                  <1> 	cli				; DISABLE INTERRUPTS
   893                              <1> 	;;mov	byte [intflg], 0 ; 07/01/2017 ;; 15/01/2017
   894 00001399 07                  <1> 	pop	es			; RESTORE REGISTERS
   895 0000139A 1F                  <1> 	pop	ds
   896 0000139B 5F                  <1> 	pop	edi
   897 0000139C 5E                  <1> 	pop	esi
   898 0000139D 5A                  <1> 	pop	edx
   899 0000139E 59                  <1> 	pop	ecx
   900 0000139F 5B                  <1> 	pop	ebx
   901 000013A0 58                  <1> 	pop	eax
   902                              <1> 	;pop	ebp
   903 000013A1 CF                  <1> 	iretd				; RETURN
   904                              <1> 
   905                              <1> 	;-----	NOT IN	HOLD STATE
   906                              <1> K28:					; NO-HOLD-STATE
   907 000013A2 3C58                <1> 	cmp	al, 88			; TEST FOR OUT-OF-RANGE SCAN CODES
   908 000013A4 77DF                <1> 	ja	short K26		; IGNORE IF OUT-OF-RANGE	
   909                              <1> 	;
   910 000013A6 F6C308              <1> 	test	bl, ALT_SHIFT 		; ARE WE IN ALTERNATE SHIFT
   911                              <1>         ;jz	short K28A		; IF NOT ALTERNATE
   912 000013A9 0F84F1000000        <1>         jz      K38
   913                              <1> 	;
   914 000013AF F6C710              <1> 	test	bh, KBX			; IS THIS THE ENCHANCED KEYBOARD?
   915 000013B2 740D                <1> 	jz	short K29		; NO, ALT STATE IS REAL
   916                              <1> 	 ;28/02/2015
   917 000013B4 F605[866F0000]04    <1> 	test	byte [KB_FLAG_1], SYS_SHIFT ; YES, IS SYSREQ KEY DOWN?
   918                              <1> 	;jz	short K29		;  NO, ALT STATE IS REAL
   919 000013BB 0F85DF000000        <1> 	jnz	K38			; YES, THIS IS PHONY ALT STATE 
   920                              <1>         ;				; DUE TO PRESSING SYSREQ	
   921                              <1> ;K28A:	jmp	short K38
   922                              <1> 	;
   923                              <1> 	;-----	TEST FOR RESET KEY SEQUENCE (CTL ALT DEL)
   924                              <1> K29:					; TEST-RESET
   925 000013C1 F6C304              <1> 	test	bl, CTL_SHIFT 		; ARE WE IN CONTROL SHIFT ALSO?
   926 000013C4 740B                <1> 	jz	short K31		; NO_RESET
   927 000013C6 3C53                <1> 	cmp	al, DEL_KEY		; CTL-ALT STATE, TEST FOR DELETE KEY
   928 000013C8 7507                <1> 	jne	short K31		; NO_RESET, IGNORE
   929                              <1> 	;
   930                              <1> 	;-----	CTL-ALT-DEL HAS BEEN FOUND
   931                              <1>  	; 26/08/2014
   932                              <1> cpu_reset:
   933                              <1> 	; IBM PC/AT ROM BIOS source code - 10/06/85 (TEST4.ASM - PROC_SHUTDOWN)
   934                              <1> 	; Send FEh (system reset command) to the keyboard controller.
   935 000013CA B0FE                <1> 	mov	al, SHUT_CMD		; SHUTDOWN COMMAND
   936 000013CC E664                <1> 	out	STATUS_PORT, al		; SEND TO KEYBOARD CONTROL PORT
   937                              <1> khere:
   938 000013CE F4                  <1> 	hlt				; WAIT FOR 80286 RESET
   939 000013CF EBFD                <1> 	jmp 	short khere		; INSURE HALT
   940                              <1> 
   941                              <1> 	;
   942                              <1> 	;-----	IN ALTERNATE SHIFT, RESET NOT FOUND
   943                              <1> K31:					; NO-RESET
   944 000013D1 3C39                <1> 	cmp	al, 57			; TEST FOR SPACE KEY
   945 000013D3 7507                <1> 	jne	short K311		; NOT THERE
   946 000013D5 B020                <1> 	mov	al, ' '			; SET SPACE CHAR
   947 000013D7 E948020000          <1>         jmp     K57                     ; BUFFER_FILL
   948                              <1> K311:
   949 000013DC 3C0F                <1> 	cmp	al, 15			; TEST FOR TAB KEY
   950 000013DE 7509                <1> 	jne	short K312		; NOT THERE
   951 000013E0 66B800A5            <1> 	mov	ax, 0A500h		; SET SPECIAL CODE FOR ALT-TAB
   952 000013E4 E93B020000          <1>         jmp     K57                     ; BUFFER_FILL
   953                              <1> K312:
   954 000013E9 3C4A                <1> 	cmp	al, 74			; TEST FOR KEY PAD -
   955 000013EB 0F84A2000000        <1>         je      K37B                    ; GO PROCESS
   956 000013F1 3C4E                <1> 	cmp	al, 78			; TEST FOR KEY PAD +
   957 000013F3 0F849A000000        <1>         je      K37B                    ; GO PROCESS
   958                              <1> 	;
   959                              <1> 	;-----	LOOK FOR KEY PAD ENTRY
   960                              <1> K32:					; ALT-KEY-PAD
   961 000013F9 BF[486E0000]        <1> 	mov	edi, K30		; ALT-INPUT-TABLE offset
   962 000013FE B90A000000          <1> 	mov	ecx, 10			; LOOK FOR ENTRY USING KEYPAD
   963 00001403 F2AE                <1> 	repne	scasb			; LOOK FOR MATCH
   964 00001405 7525                <1> 	jne	short K33		; NO_ALT_KEYPAD
   965 00001407 F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OF THE NEW KEYS?
   966 0000140A 0F858A000000        <1>         jnz     K37C                    ; YES, JUMP, NOT NUMPAD KEY
   967 00001410 81EF[496E0000]      <1> 	sub	edi, K30+1		; DI NOW HAS ENTRY VALUE
   968 00001416 A0[896F0000]        <1> 	mov	al, [ALT_INPUT] 	; GET THE CURRENT BYTE
   969 0000141B B40A                <1> 	mov	ah, 10			; MULTIPLY BY 10
   970 0000141D F6E4                <1> 	mul	ah
   971 0000141F 6601F8              <1> 	add	ax, di			; ADD IN THE LATEST ENTRY
   972 00001422 A2[896F0000]        <1> 	mov	[ALT_INPUT], al 	; STORE IT AWAY
   973                              <1> ;K32A:
   974 00001427 E959FFFFFF          <1>         jmp     K26                     ; THROW AWAY THAT KEYSTROKE
   975                              <1> 	;
   976                              <1> 	;-----	LOOK FOR SUPERSHIFT ENTRY
   977                              <1> K33:					; NO-ALT-KEYPAD
   978 0000142C C605[896F0000]00    <1>         mov     byte [ALT_INPUT], 0     ; ZERO ANY PREVIOUS ENTRY INTO INPUT
   979 00001433 B91A000000          <1> 	mov	ecx, 26			; (DI),(ES) ALREADY POINTING
   980 00001438 F2AE                <1> 	repne	scasb			; LOOK FOR MATCH IN ALPHABET
   981 0000143A 7450                <1> 	je	short K37A		; MATCH FOUND, GO FILLL THE BUFFER
   982                              <1> 	;
   983                              <1> 	;-----	LOOK FOR TOP ROW OF ALTERNATE SHIFT
   984                              <1> K34:					; ALT-TOP-ROW
   985 0000143C 3C02                <1> 	cmp	al, 2			; KEY WITH '1' ON IT
   986 0000143E 7253                <1> 	jb	short K37B		; MUST BE ESCAPE
   987 00001440 3C0D                <1> 	cmp	al, 13			; IS IT IN THE REGION
   988 00001442 7705                <1> 	ja	short K35		; NO, ALT SOMETHING ELSE
   989 00001444 80C476              <1> 	add	ah, 118			; CONVERT PSEUDO SCAN CODE TO RANGE
   990 00001447 EB43                <1> 	jmp	short K37A		; GO FILL THE BUFFER
   991                              <1> 	;
   992                              <1> 	;-----	TRANSLATE ALTERNATE SHIFT PSEUDO SCAN CODES
   993                              <1> K35:					; ALT-FUNCTION
   994 00001449 3C57                <1> 	cmp	al, F11_M		; IS IT F11?	
   995 0000144B 7209                <1> 	jb	short K35A ; 20/02/2015	; NO, BRANCH
   996 0000144D 3C58                <1> 	cmp	al, F12_M		; IS IT F12?
   997 0000144F 7705                <1> 	ja	short K35A ; 20/02/2015	; NO, BRANCH
   998 00001451 80C434              <1> 	add	ah, 52			; CONVERT TO PSEUDO SCAN CODE
   999 00001454 EB36                <1> 	jmp	short K37A		; GO FILL THE BUFFER
  1000                              <1> K35A:
  1001 00001456 F6C702              <1> 	test	bh, LC_E0		; DO WE HAVE ONE OF THE NEW KEYS?
  1002 00001459 7422                <1> 	jz	short K37		; NO, JUMP
  1003 0000145B 3C1C                <1> 	cmp	al, 28			; TEST FOR KEYPAD ENTER
  1004 0000145D 7509                <1>         jne     short K35B              ; NOT THERE
  1005 0000145F 66B800A6            <1> 	mov	ax, 0A600h		; SPECIAL CODE
  1006 00001463 E9BC010000          <1> 	jmp	K57			; BUFFER FILL
  1007                              <1> K35B:
  1008 00001468 3C53                <1> 	cmp	al, 83			; TEST FOR DELETE KEY
  1009 0000146A 742E                <1> 	je	short K37C		; HANDLE WITH OTHER EDIT KEYS
  1010 0000146C 3C35                <1> 	cmp	al, 53			; TEST FOR KEYPAD /
  1011                              <1> 	;jne	short K32A		; NOT THERE, NO OTHER E0 SPECIALS	
  1012 0000146E 0F8511FFFFFF        <1>         jne     K26
  1013 00001474 66B800A4            <1> 	mov	ax, 0A400h		; SPECIAL CODE
  1014 00001478 E9A7010000          <1> 	jmp	K57			; BUFFER FILL
  1015                              <1> K37:
  1016 0000147D 3C3B                <1> 	cmp	al, 59			; TEST FOR FUNCTION KEYS (F1)
  1017 0000147F 7212                <1>         jb      short K37B		; NO FN, HANDLE W/OTHER EXTENDED
  1018 00001481 3C44                <1> 	cmp	al, 68			; IN KEYPAD REGION?
  1019                              <1>         ;ja	short K32A		; IF SO, IGNORE
  1020 00001483 0F87FCFEFFFF        <1>         ja      K26
  1021 00001489 80C42D              <1> 	add	ah, 45			; CONVERT TO PSEUDO SCAN CODE
  1022                              <1> K37A:
  1023 0000148C B000                <1> 	mov	al, 0			; ASCII CODE OF ZERO
  1024 0000148E E991010000          <1>         jmp     K57                     ; PUT IT IN THE BUFFER
  1025                              <1> K37B:
  1026 00001493 B0F0                <1> 	mov	al, 0F0h		; USE SPECIAL ASCII CODE
  1027 00001495 E98A010000          <1> 	jmp     K57                     ; PUT IT IN THE BUFFER
  1028                              <1> K37C:
  1029 0000149A 0450                <1> 	add	al, 80			; CONVERT SCAN CODE (EDIT KEYS)
  1030 0000149C 88C4                <1> 	mov	ah, al			; (SCAN CODE NOT IN AH FOR INSERT)
  1031 0000149E EBEC                <1> 	jmp     short K37A              ; PUT IT IN THE BUFFER
  1032                              <1> 	;
  1033                              <1> 	;-----	NOT IN ALTERNATE SHIFT
  1034                              <1> K38:					; NOT-ALT-SHIFT
  1035                              <1> 					; BL STILL HAS SHIFT FLAGS
  1036 000014A0 F6C304              <1> 	test	bl, CTL_SHIFT 		; ARE WE IN CONTROL SHIFT?
  1037                              <1> 	;jnz	short K38A		; YES, START PROCESSING	
  1038 000014A3 0F84B0000000        <1>         jz      K44                     ; NOT-CTL-SHIFT
  1039                              <1> 	;
  1040                              <1> 	;-----	CONTROL SHIFT, TEST SPECIAL CHARACTERS
  1041                              <1> 	;-----	TEST FOR BREAK
  1042                              <1> K38A:
  1043 000014A9 3C46                <1> 	cmp	al, SCROLL_KEY		; TEST FOR BREAK
  1044 000014AB 7531                <1> 	jne	short K39		; JUMP, NO-BREAK
  1045 000014AD F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1046 000014B0 7405                <1> 	jz	short K38B		; NO, BREAK IS VALID	
  1047 000014B2 F6C702              <1> 	test	bh, LC_E0		; YES, WAS LAST CODE AN E0?
  1048 000014B5 7427                <1> 	jz	short K39		; NO-BREAK, TEST FOR PAUSE	
  1049                              <1> K38B:
  1050 000014B7 8B1D[926F0000]      <1> 	mov	ebx, [BUFFER_HEAD] 	; RESET BUFFER TO EMPTY
  1051 000014BD 891D[966F0000]      <1> 	mov	[BUFFER_TAIL], ebx
  1052 000014C3 C605[846F0000]80    <1> 	mov	byte [BIOS_BREAK], 80h  ; TURN ON BIOS_BREAK BIT
  1053                              <1> 	;
  1054                              <1> 	;-----	ENABLE KEYBOARD
  1055 000014CA B0AE                <1> 	mov	al, ENA_KBD		; ENABLE KEYBOARD
  1056 000014CC E8BF010000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
  1057                              <1> 	;
  1058                              <1> 	; CTRL+BREAK code here !!!
  1059                              <1> 	;INT	1BH			; BREAK INTERRUPT VECTOR
  1060                              <1> 	; 17/10/2015	
  1061 000014D1 E8FA600000          <1> 	call	ctrlbrk ; control+break subroutine
  1062                              <1> 	;
  1063 000014D6 6629C0              <1> 	sub	ax, ax			; PUT OUT DUMMY CHARACTER
  1064 000014D9 E946010000          <1>         jmp     K57                     ; BUFFER_FILL
  1065                              <1> 	;
  1066                              <1> 	;-----	TEST FOR PAUSE
  1067                              <1> K39:					; NO_BREAK
  1068 000014DE F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1069 000014E1 7537                <1> 	jnz	short K41		; YES, THEN THIS CAN'T BE PAUSE	
  1070 000014E3 3C45                <1> 	cmp	al, NUM_KEY		; LOOK FOR PAUSE KEY
  1071 000014E5 7533                <1> 	jne	short K41		; NO-PAUSE
  1072                              <1> K39P:
  1073 000014E7 800D[866F0000]08    <1> 	or	byte [KB_FLAG_1], HOLD_STATE ; TURN ON THE HOLD FLAG
  1074                              <1> 	;
  1075                              <1> 	;-----	ENABLE KEYBOARD
  1076 000014EE B0AE                <1> 	mov	al, ENA_KBD		; ENABLE KEYBOARD
  1077 000014F0 E89B010000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
  1078                              <1> K39A:
  1079 000014F5 B020                <1> 	mov	al, EOI			; END OF INTERRUPT TO CONTROL PORT
  1080 000014F7 E620                <1> 	out	20h, al ;out INTA00, al	; ALLOW FURTHER KEYSTROKE INTERRUPTS
  1081                              <1> 	;
  1082                              <1> 	;-----	DURING PAUSE INTERVAL, TURN COLOR CRT BACK ON
  1083 000014F9 803D[BA6F0000]07    <1>         cmp     byte [CRT_MODE], 7      ; IS THIS BLACK AND WHITE CARD
  1084 00001500 740A                <1>         je      short K40              	; YES, NOTHING TO DO
  1085 00001502 66BAD803            <1> 	mov	dx, 03D8h		; PORT FOR COLOR CARD
  1086 00001506 A0[BB6F0000]        <1>         mov     al, [CRT_MODE_SET] 	; GET THE VALUE OF THE CURRENT MODE
  1087 0000150B EE                  <1> 	out	dx, al			; SET THE CRT MODE, SO THAT CRT IS ON
  1088                              <1> 	;
  1089                              <1> K40:					; PAUSE-LOOP
  1090 0000150C F605[866F0000]08    <1>         test    byte [KB_FLAG_1], HOLD_STATE ; CHECK HOLD STATE FLAG
  1091 00001513 75F7                <1> 	jnz	short K40		; LOOP UNTIL FLAG TURNED OFF
  1092                              <1> 	;
  1093 00001515 E977FEFFFF          <1>         jmp     K27                     ; INTERRUPT_RETURN_NO_EOI
  1094                              <1>         ;
  1095                              <1> 	;-----	TEST SPECIAL CASE KEY 55
  1096                              <1> K41:					; NO-PAUSE
  1097 0000151A 3C37                <1> 	cmp	al, 55			; TEST FOR */PRTSC KEY
  1098 0000151C 7513                <1> 	jne	short K42		; NOT-KEY-55
  1099 0000151E F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1100 00001521 7405                <1> 	jz	short K41A		; NO, CTL-PRTSC IS VALID	
  1101 00001523 F6C702              <1> 	test	bh, LC_E0		; YES, WAS LAST CODE AN E0?
  1102 00001526 7421                <1> 	jz	short K42B		; NO, TRANSLATE TO A FUNCTION
  1103                              <1> K41A:	
  1104 00001528 66B80072            <1> 	mov	ax, 114*256		; START/STOP PRINTING SWITCH
  1105 0000152C E9F3000000          <1>         jmp     K57                     ; BUFFER_FILL
  1106                              <1> 	;
  1107                              <1> 	;-----	SET UP TO TRANSLATE CONTROL SHIFT
  1108                              <1> K42:					; NOT-KEY-55
  1109 00001531 3C0F                <1> 	cmp	al, 15			; IS IT THE TAB KEY?
  1110 00001533 7414                <1> 	je	short K42B		; YES, XLATE TO FUNCTION CODE
  1111 00001535 3C35                <1> 	cmp	al, 53			; IS IT THE / KEY?
  1112 00001537 750E                <1> 	jne	short K42A		; NO, NO MORE SPECIAL CASES	
  1113 00001539 F6C702              <1> 	test	bh, LC_E0		; YES, IS IT FROM THE KEY PAD?
  1114 0000153C 7409                <1> 	jz	short K42A		; NO, JUST TRANSLATE
  1115 0000153E 66B80095            <1> 	mov	ax, 9500h		; YES, SPECIAL CODE FOR THIS ONE
  1116 00001542 E9DD000000          <1> 	jmp	K57			; BUFFER FILL	
  1117                              <1> K42A: 
  1118                              <1> 	;;mov	ebx, _K8		; SET UP TO TRANSLATE CTL
  1119 00001547 3C3B                <1> 	cmp	al, 59			; IS IT IN CHARACTER TABLE?
  1120                              <1>         ;jb	short K45F              ; YES, GO TRANSLATE CHAR
  1121                              <1> 	;;jb	K56 ; 20/02/2015
  1122                              <1> 	;;jmp	K64 ; 20/02/2015
  1123                              <1> K42B:
  1124 00001549 BB[7C6E0000]        <1> 	mov	ebx, _K8		; SET UP TO TRANSLATE CTL
  1125 0000154E 0F82AE000000        <1> 	jb	K56 ;; 20/02/2015	
  1126 00001554 E9B9000000          <1> 	jmp	K64	
  1127                              <1>         ;
  1128                              <1> 	;-----	NOT IN CONTROL SHIFT
  1129                              <1> K44:					; NOT-CTL-SHIFT
  1130 00001559 3C37                <1> 	cmp	al, 55			; PRINT SCREEN KEY?
  1131 0000155B 7528                <1> 	jne	short K45		; NOT PRINT SCREEN
  1132 0000155D F6C710              <1> 	test	bh, KBX			; IS THIS ENHANCED KEYBOARD?
  1133 00001560 7407                <1> 	jz	short K44A		; NO, TEST FOR SHIFT STATE	
  1134 00001562 F6C702              <1> 	test	bh, LC_E0		; YES, LAST CODE A MARKER?
  1135 00001565 7507                <1> 	jnz	short K44B		; YES, IS PRINT SCREEN
  1136 00001567 EB41                <1> 	jmp	short K45C		; NO, TRANSLATE TO '*' CHARACTER
  1137                              <1> K44A:
  1138 00001569 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; NOT 101 KBD, SHIFT KEY DOWN?
  1139 0000156C 743C                <1> 	jz	short K45C		; NO, TRANSLATE TO '*' CHARACTER
  1140                              <1> 	;
  1141                              <1> 	;-----	ISSUE INTERRUPT TO INDICATE PRINT SCREEN FUNCTION
  1142                              <1> K44B:
  1143 0000156E B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
  1144 00001570 E81B010000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
  1145 00001575 B020                <1> 	mov	al, EOI			; END OF CURRENT INTERRUPT
  1146 00001577 E620                <1> 	out	20h, al ;out INTA00, al	; SO FURTHER THINGS CAN HAPPEN
  1147                              <1> 	; Print Screen !!!		; ISSUE PRINT SCREEN INTERRUPT (INT 05h)
  1148                              <1> 	;PUSH 	BP			; SAVE POINTER
  1149                              <1> 	;INT 	5H			; ISSUE PRINT SCREEN INTERRUPT
  1150                              <1> 	;POP	BP			; RESTORE POINTER
  1151 00001579 8025[886F0000]FC    <1>         and     byte [KB_FLAG_3], ~(LC_E0+LC_E1) ; ZERO OUT THESE FLAGS
  1152 00001580 E90CFEFFFF          <1>         jmp     K27                     ; GO BACK WITHOUT EOI OCCURRING
  1153                              <1> 	;
  1154                              <1> 	;-----	HANDLE IN-CORE KEYS
  1155                              <1> K45:					; NOT-PRINT-SCREEN
  1156 00001585 3C3A                <1> 	cmp	al, 58			; TEST FOR IN-CORE AREA
  1157 00001587 7734                <1> 	ja	short K46		; JUMP IF NOT
  1158 00001589 3C35                <1> 	cmp	al, 53			; IS THIS THE '/' KEY?
  1159 0000158B 7505                <1> 	jne	short K45A		; NO, JUMP
  1160 0000158D F6C702              <1> 	test	bh, LC_E0		; WAS THE LAST CODE THE MARKER?
  1161 00001590 7518                <1> 	jnz	short K45C		; YES, TRANSLATE TO CHARACTER
  1162                              <1> K45A:
  1163 00001592 B91A000000          <1> 	mov	ecx, 26			; LENGHT OF SEARCH
  1164 00001597 BF[526E0000]        <1> 	mov	edi, K30+10		; POINT TO TABLE OF A-Z CHARS
  1165 0000159C F2AE                <1> 	repne	scasb			; IS THIS A LETTER KEY?
  1166                              <1> 		; 20/02/2015
  1167 0000159E 7505                <1> 	jne	short K45B              ; NO, SYMBOL KEY
  1168                              <1> 	;
  1169 000015A0 F6C340              <1> 	test	bl, CAPS_STATE		; ARE WE IN CAPS_LOCK?
  1170 000015A3 750C                <1> 	jnz	short K45D		; TEST FOR SURE
  1171                              <1> K45B:
  1172 000015A5 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; ARE WE IN SHIFT STATE?
  1173 000015A8 750C                <1> 	jnz	short K45E		; YES, UPPERCASE
  1174                              <1> 					; NO, LOWERCASE
  1175                              <1> K45C:
  1176 000015AA BB[D46E0000]        <1> 	mov	ebx, K10		; TRANSLATE TO LOWERCASE LETTERS
  1177 000015AF EB51                <1> 	jmp	short K56	
  1178                              <1> K45D:					; ALMOST-CAPS-STATE
  1179 000015B1 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; CL ON. IS SHIFT ON, TOO?
  1180 000015B4 75F4                <1> 	jnz	short K45C		; SHIFTED TEMP OUT OF CAPS STATE
  1181                              <1> K45E:
  1182 000015B6 BB[2C6F0000]        <1> 	mov	ebx, K11		; TRANSLATE TO UPPER CASE LETTERS
  1183 000015BB EB45                <1> K45F:	jmp	short K56
  1184                              <1> 	;
  1185                              <1> 	;-----	TEST FOR KEYS F1 - F10
  1186                              <1> K46:					; NOT IN-CORE AREA
  1187 000015BD 3C44                <1> 	cmp	al, 68			; TEST FOR F1 - F10
  1188                              <1> 	;ja	short K47		; JUMP IF NOT
  1189                              <1> 	;jmp	short K53		; YES, GO DO FN KEY PROCESS			
  1190 000015BF 7635                <1> 	jna	short K53		
  1191                              <1> 	;
  1192                              <1> 	;-----	HANDLE THE NUMERIC PAD KEYS
  1193                              <1> K47:					; NOT F1 - F10
  1194 000015C1 3C53                <1> 	cmp	al, 83			; TEST NUMPAD KEYS
  1195 000015C3 772D                <1> 	ja	short K52		; JUMP IF NOT
  1196                              <1> 	;
  1197                              <1> 	;-----	KEYPAD KEYS, MUST TEST NUM LOCK FOR DETERMINATION
  1198                              <1> K48:
  1199 000015C5 3C4A                <1> 	cmp	al , 74			; SPECIAL CASE FOR MINUS
  1200 000015C7 74ED                <1> 	je	short K45E		; GO TRANSLATE
  1201 000015C9 3C4E                <1> 	cmp	al , 78			; SPECIAL CASE FOR PLUS
  1202 000015CB 74E9                <1> 	je	short K45E		; GO TRANSLATE
  1203 000015CD F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OFTHE NEW KEYS?
  1204 000015D0 750A                <1> 	jnz	short K49		; YES, TRANSLATE TO BASE STATE
  1205                              <1> 	;		
  1206 000015D2 F6C320              <1> 	test 	bl, NUM_STATE		; ARE WE IN NUM LOCK
  1207 000015D5 7514                <1> 	jnz	short K50		; TEST FOR SURE
  1208 000015D7 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; ARE WE IN SHIFT STATE?
  1209                              <1> 	;jnz	short K51		; IF SHIFTED, REALLY NUM STATE
  1210 000015DA 75DA                <1> 	jnz	short K45E
  1211                              <1> 	;
  1212                              <1> 	;-----	BASE CASE FOR KEYPAD
  1213                              <1> K49:					
  1214 000015DC 3C4C                <1> 	cmp	al, 76			; SPECIAL CASE FOR BASE STATE 5
  1215 000015DE 7504                <1> 	jne	short K49A		; CONTINUE IF NOT KEYPAD 5
  1216 000015E0 B0F0                <1> 	mov	al, 0F0h		; SPECIAL ASCII CODE	
  1217 000015E2 EB40                <1> 	jmp	short K57		; BUFFER FILL
  1218                              <1> K49A:
  1219 000015E4 BB[D46E0000]        <1> 	mov	ebx, K10		; BASE CASE TABLE	
  1220 000015E9 EB27                <1> 	jmp	short K64		; CONVERT TO PSEUDO SCAN
  1221                              <1> 	;
  1222                              <1> 	;-----	MIGHT BE NUM LOCK, TEST SHIFT STATUS
  1223                              <1> K50:					; ALMOST-NUM-STATE
  1224 000015EB F6C303              <1>         test    bl, LEFT_SHIFT+RIGHT_SHIFT
  1225 000015EE 75EC                <1> 	jnz 	short K49		; SHIFTED TEMP OUT OF NUM STATE
  1226 000015F0 EBC4                <1> K51:	jmp	short K45E		; REALLY NUM STATE
  1227                              <1> 	;
  1228                              <1> 	;-----	TEST FOR THE NEW KEYS ON WT KEYBOARDS 
  1229                              <1> K52:					; NOT A NUMPAD KEY
  1230 000015F2 3C56                <1> 	cmp	al, 86			; IS IT THE NEW WT KEY?
  1231                              <1> 	;jne	short K53		; JUMP IF NOT
  1232                              <1> 	;jmp	short K45B		; HANDLE WITH REST OF LETTER KEYS
  1233 000015F4 74AF                <1> 	je	short K45B		
  1234                              <1> 	;
  1235                              <1> 	;-----	MUST BE F11 OR F12 
  1236                              <1> K53:					; F1 - F10 COME HERE, TOO
  1237 000015F6 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; TEST SHIFT STATE
  1238 000015F9 74E1                <1> 	jz	short K49		; JUMP, LOWER CASE PSEUDO SC'S
  1239                              <1> 		; 20/02/2015 
  1240 000015FB BB[2C6F0000]        <1> 	mov	ebx, K11		; UPPER CASE PSEUDO SCAN CODES
  1241 00001600 EB10                <1> 	jmp	short K64		; TRANSLATE SCAN
  1242                              <1> 	;
  1243                              <1> 	;-----	TRANSLATE THE CHARACTER
  1244                              <1> K56:					; TRANSLATE-CHAR
  1245 00001602 FEC8                <1> 	dec	al			; CONVERT ORIGIN
  1246 00001604 D7                  <1> 	xlat    			; CONVERT THE SCAN CODE TO ASCII
  1247 00001605 F605[886F0000]02    <1> 	test	byte [KB_FLAG_3], LC_E0	; IS THIS A NEW KEY?
  1248 0000160C 7416                <1> 	jz	short K57		; NO, GO FILL BUFFER
  1249 0000160E B4E0                <1> 	mov	ah, MC_E0		; YES, PUT SPECIAL MARKER IN AH
  1250 00001610 EB12                <1> 	jmp	short K57		; PUT IT INTO THE BUFFER	
  1251                              <1> 	;
  1252                              <1> 	;-----	TRANSLATE SCAN FOR PSEUDO SCAN CODES
  1253                              <1> K64:					; TRANSLATE-SCAN-ORGD
  1254 00001612 FEC8                <1> 	dec	al			; CONVERT ORIGIN
  1255 00001614 D7                  <1>        	xlat    	                ; CTL TABLE SCAN
  1256 00001615 88C4                <1> 	mov	ah, al			; PUT VALUE INTO AH
  1257 00001617 B000                <1> 	mov	al, 0			; ZERO ASCII CODE
  1258 00001619 F605[886F0000]02    <1> 	test	byte [KB_FLAG_3], LC_E0	; IS THIS A NEW KEY?
  1259 00001620 7402                <1> 	jz	short K57		; NO, GO FILL BUFFER
  1260 00001622 B0E0                <1> 	mov	al, MC_E0		; YES, PUT SPECIAL MARKER IN AL
  1261                              <1> 	;
  1262                              <1> 	;-----	PUT CHARACTER INTO BUFFER
  1263                              <1> K57:					; BUFFER_FILL
  1264 00001624 3CFF                <1> 	cmp	al, -1			; IS THIS AN IGNORE CHAR
  1265                              <1>         ;je	short K59		; YES, DO NOTHING WITH IT
  1266 00001626 0F8459FDFFFF        <1> 	je      K26			; YES, DO NOTHING WITH IT
  1267 0000162C 80FCFF              <1> 	cmp	ah, -1			; LOOK FOR -1 PSEUDO SCAN
  1268                              <1>         ;jne	short K61		; NEAR_INTERRUPT_RETURN
  1269 0000162F 0F8450FDFFFF        <1> 	je      K26			; INTERRUPT_RETURN
  1270                              <1> ;K59:					; NEAR_INTERRUPT_RETURN
  1271                              <1> ;	jmp	K26			; INTERRUPT_RETURN
  1272                              <1> 
  1273                              <1> _K60: ; 29/01/2016
  1274 00001635 80FC68              <1> 	cmp	ah, 68h	; ALT + F1 key
  1275 00001638 721F                <1> 	jb	short K61
  1276 0000163A 80FC6F              <1> 	cmp	ah, 6Fh ; ALT + F8 key	
  1277 0000163D 771A                <1> 	ja	short K61
  1278                              <1> 	;
  1279 0000163F 8A1D[BE810100]      <1> 	mov	bl, [ACTIVE_PAGE]
  1280 00001645 80C368              <1> 	add	bl, 68h
  1281 00001648 38E3                <1> 	cmp	bl, ah
  1282 0000164A 740D                <1> 	je	short K61
  1283 0000164C 6650                <1> 	push	ax
  1284 0000164E 88E0                <1> 	mov	al, ah
  1285 00001650 2C68                <1> 	sub	al, 68h
  1286 00001652 E858090000          <1> 	call	set_active_page
  1287 00001657 6658                <1> 	pop	ax
  1288                              <1> K61:					; NOT-CAPS-STATE
  1289 00001659 8B1D[966F0000]      <1> 	mov	ebx, [BUFFER_TAIL] 	; GET THE END POINTER TO THE BUFFER
  1290 0000165F 89DE                <1> 	mov	esi, ebx		; SAVE THE VALUE
  1291 00001661 E857FAFFFF          <1> 	call	_K4			; ADVANCE THE TAIL
  1292 00001666 3B1D[926F0000]      <1> 	cmp	ebx, [BUFFER_HEAD] 	; HAS THE BUFFER WRAPPED AROUND
  1293 0000166C 740E                <1> 	je	short K62		; BUFFER_FULL_BEEP
  1294 0000166E 668906              <1> 	mov	[esi], ax		; STORE THE VALUE
  1295 00001671 891D[966F0000]      <1> 	mov	[BUFFER_TAIL], ebx 	; MOVE THE POINTER UP
  1296 00001677 E909FDFFFF          <1> 	jmp	K26
  1297                              <1> 	;;cli				; TURN OFF INTERRUPTS
  1298                              <1> 	;;mov	al, EOI			; END OF INTERRUPT COMMAND
  1299                              <1> 	;;out	INTA00, al		; SEND COMMAND TO INTERRUPT CONTROL PORT
  1300                              <1> 	;MOV	AL, ENA_KBD		; INSURE KEYBOARD IS ENABLED
  1301                              <1> 	;CALL	SHIP_IT			; EXECUTE ENABLE
  1302                              <1> 	;MOV	AX, 9102H		; MOVE IN POST CODE & TYPE
  1303                              <1> 	;INT	15H			; PERFORM OTHER FUNCTION
  1304                              <1> 	;;and	byte [KB_FLAG_3],~(LC_E0+LC_E1) ; RESET LAST CHAR H.C. FLAG
  1305                              <1> 	;JMP	K27A			; INTERRUPT_RETURN
  1306                              <1> 	;;jmp   K27                    
  1307                              <1> 	;
  1308                              <1> 	;-----	BUFFER IS FULL SOUND THE BEEPER
  1309                              <1> K62:
  1310 0000167C B020                <1> 	mov	al, EOI			; ENABLE INTERRUPT CONTROLLER CHIP
  1311 0000167E E620                <1> 	out	INTA00, al
  1312 00001680 66B9A602            <1> 	mov	cx, 678			; DIVISOR FOR 1760 HZ
  1313 00001684 B304                <1> 	mov	bl, 4			; SHORT BEEP COUNT (1/16 + 1/64 DELAY)
  1314 00001686 E8650D0000          <1> 	call	beep			; GO TO COMMON BEEP HANDLER
  1315 0000168B E901FDFFFF          <1> 	jmp     K27			; EXIT   
  1316                              <1> 
  1317                              <1> SHIP_IT:
  1318                              <1> 	;---------------------------------------------------------------------------------
  1319                              <1> 	; SHIP_IT
  1320                              <1> 	;	THIS ROUTINES HANDLES TRANSMISSION OF COMMAND AND DATA BYTES
  1321                              <1> 	;	TO THE KEYBOARD CONTROLLER.
  1322                              <1> 	;---------------------------------------------------------------------------------
  1323                              <1> 	;
  1324 00001690 6650                <1> 	push	ax			; SAVE DATA TO SEND
  1325                              <1> 
  1326                              <1> 	;-----	WAIT FOR COMMAND TO ACCEPTED
  1327 00001692 FA                  <1> 	cli				; DISABLE INTERRUPTS TILL DATA SENT
  1328                              <1> 	; xor	ecx, ecx		; CLEAR TIMEOUT COUNTER
  1329 00001693 B900000100          <1> 	mov	ecx, 10000h			
  1330                              <1> S10:
  1331 00001698 E464                <1> 	in	al, STATUS_PORT		; READ KEYBOARD CONTROLLER STATUS
  1332 0000169A A802                <1> 	test	al, INPT_BUF_FULL	; CHECK FOR ITS INPUT BUFFER BUSY
  1333 0000169C E0FA                <1> 	loopnz	S10			; WAIT FOR COMMAND TO BE ACCEPTED
  1334                              <1> 
  1335 0000169E 6658                <1> 	pop	ax			; GET DATA TO SEND
  1336 000016A0 E664                <1> 	out	STATUS_PORT, al		; SEND TO KEYBOARD CONTROLLER
  1337 000016A2 FB                  <1> 	sti				; ENABLE INTERRUPTS AGAIN
  1338 000016A3 C3                  <1> 	retn				; RETURN TO CALLER
  1339                              <1> 
  1340                              <1> SND_DATA:
  1341                              <1> 	; ---------------------------------------------------------------------------------
  1342                              <1> 	; SND_DATA
  1343                              <1> 	;	THIS ROUTINES HANDLES TRANSMISSION OF COMMAND AND DATA BYTES
  1344                              <1> 	;	TO THE KEYBOARD AND RECEIPT OF ACKNOWLEDGEMENTS. IT ALSO
  1345                              <1> 	;	HANDLES ANY RETRIES IF REQUIRED
  1346                              <1> 	; ---------------------------------------------------------------------------------
  1347                              <1> 	;
  1348 000016A4 6650                <1> 	push	ax			; SAVE REGISTERS
  1349 000016A6 6653                <1> 	push	bx
  1350 000016A8 51                  <1> 	push	ecx
  1351 000016A9 88C7                <1> 	mov	bh, al			; SAVE TRANSMITTED BYTE FOR RETRIES
  1352 000016AB B303                <1> 	mov	bl, 3			; LOAD RETRY COUNT
  1353                              <1> SD0:
  1354 000016AD FA                  <1> 	cli				; DISABLE INTERRUPTS
  1355 000016AE 8025[876F0000]CF    <1> 	and	byte [KB_FLAG_2], ~(KB_FE+KB_FA) ; CLEAR ACK AND RESEND FLAGS
  1356                              <1> 	;
  1357                              <1> 	;-----	WAIT FOR COMMAND TO BE ACCEPTED
  1358 000016B5 B900000100          <1> 	mov	ecx, 10000h		; MAXIMUM WAIT COUNT
  1359                              <1> SD5:
  1360 000016BA E464                <1> 	in	al, STATUS_PORT		; READ KEYBOARD PROCESSOR STATUS PORT
  1361 000016BC A802                <1> 	test	al, INPT_BUF_FULL	; CHECK FOR ANY PENDING COMMAND
  1362 000016BE E0FA                <1> 	loopnz	SD5			; WAIT FOR COMMAND TO BE ACCEPTED
  1363                              <1> 	;
  1364 000016C0 88F8                <1> 	mov	al, bh			; REESTABLISH BYTE TO TRANSMIT
  1365 000016C2 E660                <1> 	out	PORT_A, al		; SEND BYTE
  1366 000016C4 FB                  <1> 	sti				; ENABLE INTERRUPTS
  1367                              <1> 	;mov	cx, 01A00h		; LOAD COUNT FOR 10 ms+
  1368 000016C5 B9FFFF0000          <1> 	mov	ecx, 0FFFFh
  1369                              <1> SD1:
  1370 000016CA F605[876F0000]30    <1> 	test	byte [KB_FLAG_2], KB_FE+KB_FA ; SEE IF EITHER BIT SET
  1371 000016D1 750F                <1> 	jnz	short SD3		; IF SET, SOMETHING RECEIVED GO PROCESS
  1372 000016D3 E2F5                <1> 	loop	SD1			; OTHERWISE WAIT
  1373                              <1> SD2:
  1374 000016D5 FECB                <1> 	dec	bl			; DECREMENT RETRY COUNT
  1375 000016D7 75D4                <1> 	jnz	short SD0		; RETRY TRANSMISSION
  1376 000016D9 800D[876F0000]80    <1> 	or	byte [KB_FLAG_2], KB_ERR ; TURN ON TRANSMIT ERROR FLAG
  1377 000016E0 EB09                <1> 	jmp	short SD4		; RETRIES EXHAUSTED FORGET TRANSMISSION
  1378                              <1> SD3:
  1379 000016E2 F605[876F0000]10    <1> 	test	byte [KB_FLAG_2], KB_FA ; SEE IF THIS IS AN ACKNOWLEDGE
  1380 000016E9 74EA                <1> 	jz	short SD2		; IF NOT, GO RESEND
  1381                              <1> SD4:	
  1382 000016EB 59                  <1> 	pop	ecx			; RESTORE REGISTERS
  1383 000016EC 665B                <1> 	pop	bx
  1384 000016EE 6658                <1> 	pop	ax
  1385 000016F0 C3                  <1> 	retn				; RETURN, GOOD TRANSMISSION
  1386                              <1> 
  1387                              <1> SND_LED:
  1388                              <1> 	; ---------------------------------------------------------------------------------
  1389                              <1> 	; SND_LED
  1390                              <1> 	;	THIS ROUTINES TURNS ON THE MODE INDICATORS.
  1391                              <1> 	;
  1392                              <1> 	;----------------------------------------------------------------------------------
  1393                              <1> 	;
  1394 000016F1 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1395 000016F2 F605[876F0000]40    <1> 	test	byte [KB_FLAG_2], KB_PR_LED ; CHECK FOR MODE INDICATOR UPDATE
  1396 000016F9 755F                <1> 	jnz 	short SL1		; DON'T UPDATE AGAIN IF UPDATE UNDERWAY
  1397                              <1> 	;
  1398 000016FB 800D[876F0000]40    <1> 	or	byte [KB_FLAG_2], KB_PR_LED ; TURN ON UPDATE IN PROCESS
  1399 00001702 B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
  1400 00001704 E620                <1> 	out	20h, al ;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
  1401 00001706 EB11                <1> 	jmp	short SL0		; GO SEND MODE INDICATOR COMMAND
  1402                              <1> SND_LED1:
  1403 00001708 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1404 00001709 F605[876F0000]40    <1> 	test	byte [KB_FLAG_2], KB_PR_LED ; CHECK FOR MODE INDICATOR UPDATE
  1405 00001710 7548                <1> 	jnz	short SL1		; DON'T UPDATE AGAIN IF UPDATE UNDERWAY
  1406                              <1> 	;
  1407 00001712 800D[876F0000]40    <1> 	or	byte [KB_FLAG_2], KB_PR_LED ; TURN ON UPDATE IN PROCESS
  1408                              <1> SL0:
  1409 00001719 B0ED                <1> 	mov	al, LED_CMD		; LED CMD BYTE
  1410 0000171B E884FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1411 00001720 FA                  <1> 	cli
  1412 00001721 E836000000          <1> 	call	MAKE_LED		; GO FORM INDICATOR DATA BYTE
  1413 00001726 8025[876F0000]F8    <1> 	and	byte [KB_FLAG_2], 0F8h	; ~KB_LEDS ; CLEAR MODE INDICATOR BITS
  1414 0000172D 0805[876F0000]      <1> 	or	[KB_FLAG_2], al 	; SAVE PRESENT INDICATORS FOR NEXT TIME
  1415 00001733 F605[876F0000]80    <1> 	test	byte [KB_FLAG_2], KB_ERR ; TRANSMIT ERROR DETECTED
  1416 0000173A 750F                <1> 	jnz	short SL2		; IF SO, BYPASS SECOND BYTE TRANSMISSION
  1417                              <1> 	;
  1418 0000173C E863FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1419 00001741 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1420 00001742 F605[876F0000]80    <1> 	test	byte [KB_FLAG_2], KB_ERR ; TRANSMIT ERROR DETECTED
  1421 00001749 7408                <1> 	jz	short SL3		; IF NOT, DON'T SEND AN ENABLE COMMAND
  1422                              <1> SL2:
  1423 0000174B B0F4                <1> 	mov	al, KB_ENABLE		; GET KEYBOARD CSA ENABLE COMMAND
  1424 0000174D E852FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1425 00001752 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1426                              <1> SL3:
  1427 00001753 8025[876F0000]3F    <1> 	and	byte [KB_FLAG_2], ~(KB_PR_LED+KB_ERR) ; TURN OFF MODE INDICATOR
  1428                              <1> SL1:					; UPDATE AND TRANSMIT ERROR FLAG
  1429 0000175A FB                  <1> 	sti				; ENABLE INTERRUPTS
  1430 0000175B C3                  <1> 	retn				; RETURN TO CALLER
  1431                              <1> 
  1432                              <1> MAKE_LED:
  1433                              <1> 	;---------------------------------------------------------------------------------
  1434                              <1> 	; MAKE_LED
  1435                              <1> 	;	THIS ROUTINES FORMS THE DATA BYTE NECESSARY TO TURN ON/OFF
  1436                              <1> 	;	THE MODE INDICATORS.
  1437                              <1> 	;---------------------------------------------------------------------------------
  1438                              <1> 	;
  1439                              <1> 	;push 	cx			; SAVE CX
  1440 0000175C A0[856F0000]        <1> 	mov	al, [KB_FLAG]		; GET CAPS & NUM LOCK INDICATORS
  1441 00001761 2470                <1> 	and	al, CAPS_STATE+NUM_STATE+SCROLL_STATE ; ISOLATE INDICATORS
  1442                              <1> 	;mov	cl, 4			; SHIFT COUNT
  1443                              <1> 	;rol	al, cl			; SHIFT BITS OVER TO TURN ON INDICATORS
  1444 00001763 C0C004              <1> 	rol	al, 4 ; 20/02/2015
  1445 00001766 2407                <1> 	and	al, 07h			; MAKE SURE ONLY MODE BITS ON
  1446                              <1> 	;pop	cx
  1447 00001768 C3                  <1> 	retn				; RETURN TO CALLER
  1448                              <1> 
  1449                              <1> ; % include 'kybdata.s'   ; KEYBOARD DATA
  1450                              <1> 
  1451                              <1> 
  1452                              <1> ; /// End Of KEYBOARD FUNCTIONS ///
  2653                                  
  2654                                  %include 'video.s' ; 07/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.3 - video.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 24/01/2021
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 16/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.15 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; video.inc (13/08/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-AT' BIOS source code (1985) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - VIDEO.INC
    20                              <1> ; Last Modification: 13/08/2015
    21                              <1> ;		  (Video Data is in 'VIDATA.INC')
    22                              <1> ;
    23                              <1> ; ///////// VIDEO (CGA) FUNCTIONS ///////////////
    24                              <1> 
    25                              <1> ; 16/01/2016 (32 bit modifications, TRDOS386 - TRDOS v2.0, video.s)
    26                              <1> ; INT 31H (TRDOS 386) = INT 10H (IBM PC/AT REAL MODE)
    27                              <1> 
    28                              <1> ; IBM PC-AT BIOS Source Code
    29                              <1> ; TITLE VIDEO1 --- 06/10/85 VIDEO DISPLAY BIOS
    30                              <1> 
    31                              <1> _int10h:
    32                              <1> 	; 23/03/2016
    33                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
    34 00001769 9C                  <1> 	pushfd
    35 0000176A 0E                  <1> 	push	cs
    36 0000176B E851000000          <1> 	call	VIDEO_IO_1
    37 00001770 C3                  <1> 	retn
    38                              <1> 
    39                              <1> ;--- INT 10 H -------------------------------------------------------------------
    40                              <1> ; VIDEO_IO									:
    41                              <1> ;	THESE ROUTINES PROVIDE THE CRT DISPLAY INTERFACE			:
    42                              <1> ;	THE FOLLOWING FUNCTIONS ARE PROVIDED:					:
    43                              <1> ;										:
    44                              <1> ;    (AH)= 00H	SET MODE (AL) CONTAINS MODE VALUE				:
    45                              <1> ;		(AL) = 00H  40X25 BW MODE (POWER ON DEFAULT)			:
    46                              <1> ;		(AL) = 01H  40X25 COLOR						:
    47                              <1> ;		(AL) = 02H  80X25 BW						:
    48                              <1> ;		(AL) = 03H  80X25 COLOR						:
    49                              <1> ;		              GRAPHICS MODES					:
    50                              <1> ;		(AL) = 04H  320X200 COLOR					:
    51                              <1> ;		(AL) = 05H  320X200 BW MODE					:
    52                              <1> ;		(AL) = 06H  640X200 BW MODE					:
    53                              <1> ;		(AL) = 07H   80X25 MONOCHROME (USED INTERNAL TO VIDEO ONLY)	:
    54                              <1> ;		*** NOTES -BW MODES OPERATE SAME AS COLOR MODES, BUT COLOR	:
    55                              <1> ;		           BURST IS NOT ENABLED					:
    56                              <1> ;		          -CURSOR IS NOT DISPLAYED IN GRAPHICS MODE		:
    57                              <1> ;    (AH)= 01H	SET CURSOR TYPE							:
    58                              <1> ;		(CH) = BITS 4-0 = START LINE FOR CURSOR				:
    59                              <1> ;		       ** HARDWARE WILL ALWAYS CAUSE BLINK			:
    60                              <1> ;		       ** SETTING BIT 5 OR 6 WILL CAUSE ERRATIC BLINKING	:
    61                              <1> ;		          OR NO CURSOR AT ALL					:
    62                              <1> ;		(CL) = BITS 4-0 = END LINE FOR CURSOR				:
    63                              <1> ;    (AH)= 02H	SET CURSOR POSITION						:
    64                              <1> ;		(DH,DL) = ROW,COLUMN  (00H,00H) IS UPPER LEFT			:
    65                              <1> ;		(BH) = A PAGE NUMBER (MUST BE 00H FOR GRAPHICS MODES)		:
    66                              <1> ;    (AH)= 03H	READ CURSOR POSITION						:
    67                              <1> ;		(BH) = PAGE NUMBER (MUST BE 00H FOR GRAPHICS MODES)		:
    68                              <1> ;		ON EXIT (DH,DL) = ROW,COLUMN OF CURRENT CURSOR			:
    69                              <1> ;		        (CH,CL) = CURSOR MODE CURRENTLY SET			:
    70                              <1> ;    (AH)= 04H	READ LIGHT PEN POSITION						:
    71                              <1> ;		ON EXIT:							:
    72                              <1> ;		(AH) = 00H -- LIGHT PEN SWITCH NOT DOWN/NOT TRIGGERED		:
    73                              <1> ;		(AH) = 01H -- VALID LIGHT PEN VALUE IN REGISTERS		:
    74                              <1> ;		        (DH,DL) = ROW,COLUMN OF CHARACTER LP POSITION		:
    75                              <1> ;		        (CH) = RASTER LINE (0-199)				:
    76                              <1> ;		        (BX) = PIXEL COLUMN (0-319,639)				:
    77                              <1> ;    (AH)= 05H	SELECT ACTIVE DISPLAY PAGE (VALID ONLY FOR ALPHA MODES)		:
    78                              <1> ;		(AL) = NEW PAGE VALUE (0-7 FOR MODES 0&1, 0-3 FOR MODES 2&3)	:
    79                              <1> ;    (AH)= 06H	SCROLL ACTIVE PAGE UP						:
    80                              <1> ;		(AL) = NUMBER OF LINES. ( LINES BLANKED AT BOTTOM OF WINDOW )	:
    81                              <1> ;		        (AL) = 00H MEANS BLANK ENTIRE WINDOW			:
    82                              <1> ;		(CH,CL) = ROW,COLUMN OF UPPER LEFT CORNER OF SCROLL		:
    83                              <1> ;		(DH,DL) = ROW,COLUMN OF LOWER RIGHT CORNER OF SCROLL		:
    84                              <1> ;		(BH) = ATTRIBUTE TO BE USED ON BLANK LINE			:
    85                              <1> ;    (AH)= 07H	SCROLL ACTIVE PAGE DOWN						:
    86                              <1> ;		(AL) = NUMBER OF LINES, INPUT LINES BLANKED AT TOP OF WINDOW	:
    87                              <1> ;		        (AL) = 00H MEANS BLANK ENTIRE WINDOW			:
    88                              <1> ;		(CH,CL) = ROW,COLUMN OF UPPER LEFT CORNER OF SCROLL		:
    89                              <1> ;		(DH,DL) = ROW,COLUMN OF LOWER RIGHT CORNER OF SCROLL		:
    90                              <1> ;		(BH) = ATTRIBUTE TO BE USED ON BLANK LINE			:
    91                              <1> ;										:
    92                              <1> ;   CHARACTER HANDLING ROUTINES							:
    93                              <1> ;										:
    94                              <1> ;    (AH)= 08H	READ ATTRIBUTE/CHARACTER AT CURRENT CURSOR POSITION		:
    95                              <1> ;		(BH) = DISPLAY PAGE (VALID FOR ALPHA MODES ONLY)		:
    96                              <1> ;		ON EXIT:							:
    97                              <1> ;		(AL) = CHAR READ						:
    98                              <1> ;		(AH) = ATTRIBUTE OF CHARACTER READ (ALPHA MODES ONLY)		:
    99                              <1> ;    (AH)= 09H	WRITE ATTRIBUTE/CHARACTER AT CURRENT CURSOR POSITION		:
   100                              <1> ;		(BH) = DISPLAY PAGE (VALID FOR ALPHA MODES ONLY)		:
   101                              <1> ;		(CX) = COUNT OF CHARACTERS TO WRITE				:
   102                              <1> ;		(AL) = CHAR TO WRITE						:
   103                              <1> ;		(BL) = ATTRIBUTE OF CHARACTER (ALPHA)/COLOR OF CHAR (GRAPHICS)	:
   104                              <1> ;		         SEE NOTE ON WRITE DOT FOR BIT 7 OF BL = 1.		:
   105                              <1> ;    (AH) = 0AH	WRITE CHARACTER ONLY AT CURRENT CURSOR POSITION			:
   106                              <1> ;		(BH) = DISPLAY PAGE (VALID FOR ALPHA MODES ONLY)		:
   107                              <1> ;		(CX) = COUNT OF CHARACTERS TO WRITE				:
   108                              <1> ;		(AL) = CHAR TO WRITE						:
   109                              <1> ;		       NOTE: USE FUNCTION (AH)= 09H IN GRAPHICS MODES		:
   110                              <1> ;	FOR READ/WRITE CHARACTER INTERFACE WHILE IN GRAPHICS MODE, THE		:
   111                              <1> ;		CHARACTERS ARE FORMED FROM A CHARACTER GENERATOR IMAGE		:
   112                              <1> ;		MAINTAINED IN THE SYSTEM ROM. ONLY THE 1ST 128 CHARS		:
   113                              <1> ;		ARE CONTAINED THERE. TO READ/WRITE THE SECOND 128 CHARS,	:
   114                              <1> ;		THE USER MUST INITIALIZE THE POINTER AT INTERRUPT 1FH		:
   115                              <1> ;		(LOCATION 0007CH) TO POINT TO THE 1K BYTE TABLE CONTAINING	:
   116                              <1> ;		THE CODE POINTS FOR THE SECOND 128 CHARS (128-255).		:
   117                              <1> ;	FOR WRITE CHARACTER INTERFACE IN GRAPHICS MODE, THE REPLICATION FACTOR	:
   118                              <1> ;		CONTAINED IN (CX) ON ENTRY WILL PRODUCE VALID RESULTS ONLY	:
   119                              <1> ;		FOR CHARACTERS CONTAINED ON THE SAME ROW. CONTINUATION TO	:
   120                              <1> ;		SUCCEEDING LINES WILL NOT PRODUCE CORRECTLY.			:
   121                              <1> ;										:
   122                              <1> ;    GRAPHICS INTERFACE								:
   123                              <1> ;    (AH)= 0BH	SET COLOR PALETTE						:
   124                              <1> ;		(BH) = PALETTE COLOR ID BEING SET (0-127)			:
   125                              <1> ;		(BL) = COLOR VALUE TO BE USED WITH THAT COLOR ID		:
   126                              <1> ;		       NOTE: FOR THE CURRENT COLOR CARD, THIS ENTRY POINT HAS	:
   127                              <1> ;		               MEANING ONLY FOR 320X200 GRAPHICS.		:
   128                              <1> ;		       COLOR ID = 0 SELECTS THE BACKGROUND COLOR (0-15)		:
   129                              <1> ;		       COLOR ID = 1 SELECTS THE PALETTE TO BE USED:		:
   130                              <1> ;		               0 = GREEN(1)/RED(2)/YELLOW(3)			:
   131                              <1> ;		               1 = CYAN(1)/MAGENTA(2)/WHITE(3)			:
   132                              <1> ;		       IN 40X25 OR 80X25 ALPHA MODES, THE VALUE SET FOR 	:
   133                              <1> ;		               PALETTE COLOR 0 INDICATES THE BORDER COLOR	:
   134                              <1> ;		               TO BE USED (VALUES 0-31, WHERE 16-31 SELECT	:
   135                              <1> ;		               THE HIGH INTENSITY BACKGROUND SET.		:
   136                              <1> ;    (AH)= 0CH	WRITE DOT							:
   137                              <1> ;		(DX) = ROW NUMBER						:
   138                              <1> ;		(CX) = COLUMN NUMBER						:
   139                              <1> ;		(AL) = COLOR VALUE						:
   140                              <1> ;		        IF BIT 7 OF AL = 1, THEN THE COLOR VALUE IS EXCLUSIVE	:
   141                              <1> ;		        ORed WITH THE CURRENT CONTENTS OF THE DOT		:
   142                              <1> ;    (AH)= ODH	READ DOT							:
   143                              <1> ;		(DX) = ROW NUMBER						:
   144                              <1> ;		(CX) = COLUMN NUMBER						:
   145                              <1> ;		(AL) = RETURNS THE DOT READ					:
   146                              <1> ;										:
   147                              <1> ;    ASCII TELETYPE ROUTINE FOR OUTPUT						:
   148                              <1> ;										:
   149                              <1> ;    (AH)= 0EH	WRITE TELETYPE TO ACTIVE PAGE					:
   150                              <1> ;		(AL) = CHAR TO WRITE						:
   151                              <1> ;		(BL) = FOREGROUND COLOR IN GRAPHICS MODE			:
   152                              <1> ;		NOTE -- SCREEN WIDTH IS CONTROLLED BY PREVIOUS MODE SET		:
   153                              <1> ;    (AH)= 0FH	CURRENT VIDEO STATE						:
   154                              <1> ;		RETURNS THE CURRENT VIDEO STATE					:
   155                              <1> ;		(AL) = MODE CURRENTLY SET ( SEE (AH)=00H FOR EXPLANATION)	:
   156                              <1> ;		(AH) = NUMBER OR CHARACTER COLUMNS ON SCREEN			:
   157                              <1> ;		(BH) = CURRENT ACTIVE DISPLAY PAGE				:
   158                              <1> ;    (AH)= 10H	RESERVED							:
   159                              <1> ;    (AH)= 11H	RESERVED							:
   160                              <1> ;    (AH)= 12H	RESERVED							:
   161                              <1> ;    (AH)= 13H	WRITE STRING							:
   162                              <1> ;			ES:BP  -  POINTER T0 STRING TO BE WRITTEN		:
   163                              <1> ;			CX     -  LENGTH OF CHARACTER STRING TO WRITTEN		:
   164                              <1> ;			DX     -  CURSOR POSITION FOR STRING TO BE WRITTEN	:
   165                              <1> ;			BH     -  PAGE NUMBER					:
   166                              <1> ;		(AL)= 00H	WRITE CHARACTER STRING				:
   167                              <1> ;			BL     -  ATTRIBUTE					:
   168                              <1> ;			STRING IS  <CHAR,CHAR, ... ,CHAR>			:
   169                              <1> ;			CURSOR NOT MOVED					:
   170                              <1> ;		(AL)= 01H	WRITE CHARACTER STRING AND MOVE CURSOR		:
   171                              <1> ;			BL     -  ATTRIBUTE					:
   172                              <1> ;			STRING IS  <CHAR,CHAR, ... ,CHAR>			:
   173                              <1> ;			CURSOR MOVED						:
   174                              <1> ;		(AL)= 02H	WRITE CHARACTER AND ATTRIBUTE STRING		:
   175                              <1> ;			       (VALID FOR ALPHA MODES ONLY)			:
   176                              <1> ;			STRING IS <CHAR,ATTR,CHAR,ATTR ..  ,CHAR,ATTR>		:
   177                              <1> ;			CURSOR IS NOT MOVED					:
   178                              <1> ;		(AL)= 03H WRITE CHARACTER AND ATTRIBUTE STRING AND MOVE CURSOR	:
   179                              <1> ;			       (VALID FOR ALPHA MODES ONLY)			:
   180                              <1> ;			STRING IS <CHAR,ATTR,CHAR,ATTR ..  ,CHAR,ATTR>		:
   181                              <1> ;			CURSOR IS MOVED						:
   182                              <1> ;		 NOTE:  CARRIAGE RETURN, LINE FEED, BACKSPACE, AND BELL ARE	:
   183                              <1> ;		        TREATED AS COMMANDS RATHER THAN PRINTABLE CHARACTERS.	:
   184                              <1> ;										:
   185                              <1> ;	BX,CX,DX,SI,DI,BP,SP,DS,ES,SS PRESERVED DURING CALLS EXCEPT FOR		:
   186                              <1> ;	BX,CX,DX RETURN VALUES ON FUNCTIONS 03H,04H,0DH AND 0FH. ON ALL CALLS	:
   187                              <1> ;	AX IS MODIFIED.								:
   188                              <1> ;--------------------------------------------------------------------------------
   189                              <1> 
   190 00001771 [221B0000]          <1> M1:	dd	SET_MODE	; TABLE OF ROUTINES WITHIN VIDEO I/O
   191 00001775 [EF1E0000]          <1> 	dd	SET_CTYPE
   192 00001779 [231F0000]          <1> 	dd	SET_CPOS
   193 0000177D [4B1F0000]          <1> 	dd	READ_CURSOR
   194                              <1> 	;dd	VIDEO_RETURN	; READ_LPEN
   195 00001781 [201B0000]          <1> 	dd	set_mode_ncm	; Set mode without clearing video memory
   196 00001785 [911F0000]          <1> 	dd	ACT_DISP_PAGE
   197 00001789 [23200000]          <1> 	dd	SCROLL_UP
   198 0000178D [4D210000]          <1> 	dd	SCROLL_DOWN
   199 00001791 [CD210000]          <1> 	dd	READ_AC_CURRENT
   200 00001795 [2A220000]          <1> 	dd	WRITE_AC_CURRENT
   201 00001799 [50220000]          <1> 	dd	WRITE_C_CURRENT
   202 0000179D [8B2B0000]          <1> 	dd	SET_COLOR
   203 000017A1 [F62B0000]          <1> 	dd	WRITE_DOT
   204 000017A5 [C12B0000]          <1> 	dd	READ_DOT
   205 000017A9 [E0220000]          <1> 	dd	WRITE_TTY
   206 000017AD [081B0000]          <1> 	dd	VIDEO_STATE
   207 000017B1 [8A360000]          <1> 	dd	vga_pal_funcs	; 10/08/2016 (TRDOS 386)
   208 000017B5 [03310000]          <1> 	dd	font_setup	; 10/07/2016 (TRDOS 386)
   209 000017B9 [571B0000]          <1> 	dd	VIDEO_RETURN	; RESERVED
   210 000017BD [51240000]          <1> 	dd	WRITE_STRING	; 23/06/2016 (TRDOS 386)
   211                              <1> M1L	EQU	$ - M1
   212                              <1> 
   213                              <1> ; 06/12/2020
   214                              <1> ; 05/12/2020
   215                              <1> ; 03/12/2020
   216                              <1> ; 27/11/2020 - TRDOS 386 v2.0.3
   217                              <1> ; 14/01/2017
   218                              <1> ; 02/01/2017
   219                              <1> ; 04/07/2016
   220                              <1> ; 12/05/2016
   221                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   222                              <1> int31h:  ; Video BIOS
   223                              <1> 
   224                              <1> ; BH = Video page number
   225                              <1> ; BL = Color/Attribute
   226                              <1> ; AH = Function number
   227                              <1> ; AL = Character
   228                              <1> 
   229                              <1> VIDEO_IO_1:
   230                              <1> 	;sti				; INTERRUPTS BACK ON
   231 000017C1 FC                  <1> 	cld				; SET DIRECTION FORWARD
   232                              <1> 	
   233                              <1> 	;cmp	ah, M1L/4		; TEST FOR WITHIN TABLE RANGE
   234                              <1> 	;jnb	short M4		; BRANCH TO EXIT IF NOT A VALID COMMAND
   235                              <1> 
   236                              <1> 	; 26/11/2020
   237 000017C2 80FC14              <1> 	cmp	ah, M1L/4
   238 000017C5 7205                <1> 	jb	short VGA_func
   239                              <1> 
   240 000017C7 80FC4F              <1> 	cmp	ah, 4Fh
   241 000017CA 7532                <1> 	jne	short M4 ; invalid !
   242                              <1> 
   243                              <1> VGA_func: ; 26/11/2020
   244 000017CC 06                  <1> 	push	es ; *
   245 000017CD 1E                  <1> 	push	ds ; **			; SAVE WORK AND PARAMETER REGISTERS
   246                              <1> 
   247                              <1> 	; 26/11/2020
   248 000017CE 50                  <1> 	push	eax ; -
   249                              <1> 	
   250 000017CF 66B81000            <1> 	mov	ax, KDATA 		; POINT DS: TO DATA SEGMENT
   251 000017D3 8ED8                <1> 	mov	ds, ax
   252 000017D5 8EC0                <1> 	mov	es, ax
   253                              <1> 
   254                              <1> 	; 26/11/2020
   255 000017D7 58                  <1> 	pop	eax ; +
   256                              <1> 	;
   257 000017D8 FB                  <1> 	sti
   258 000017D9 80FC4F              <1> 	cmp	ah, 4Fh
   259 000017DC 747A                <1> 	je	short VBE_func
   260                              <1> 
   261                              <1> 	; 04/12/2020
   262 000017DE A3[188E0100]        <1> 	mov	[video_eax], eax
   263                              <1> 
   264                              <1> 	; 21/12/2020
   265 000017E3 803D[BA6F0000]FF    <1> 	cmp	byte [CRT_MODE], 0FFh	; Current mode is a VESA VBE mode ?
   266 000017EA 7213                <1> 	jb	short VGA_func_std
   267                              <1> 
   268 000017EC 08E4                <1> 	or	ah, ah			; set mode ?
   269 000017EE 750F                <1> 	jnz	short VGA_func_std	; no
   270                              <1> 
   271 000017F0 803D[54090000]03    <1> 	cmp	byte [vbe3], 3		; (real) VESA VBE 3 video bios ?
   272 000017F7 7506                <1> 	jne	short VGA_func_std	; no
   273                              <1> 
   274 000017F9 E989010000          <1> 	jmp	vesa_vbe3_pmi
   275                              <1> 
   276                              <1> 	; 21/12/2020
   277                              <1> M4:					; COMMAND NOT VALID
   278 000017FE CF                  <1> 	iretd				; DO NOTHING IF NOT IN VALID RANGE
   279                              <1> 
   280                              <1> VGA_func_std:
   281                              <1> 	; 06/12/2020
   282                              <1> 	; 03/12/2020
   283 000017FF 80FC0F              <1> 	cmp	ah, 0Fh
   284 00001802 773D                <1> 	ja	short VGA_funcs_0	; only CGA funcs will be handled by	
   285                              <1> 	; 06/12/2020			; vga bios firmware
   286                              <1> 	; 03/12/2020			
   287                              <1> 	;test	ah, 7Fh ; set mode ?
   288                              <1> 	;;or	ah, ah			; only 'set mode' will be handled by
   289                              <1> 	;jnz	short VGA_funcs_0	; vga bios firmware	
   290                              <1> 	;jz	short vbe_pmi32_0
   291                              <1> 
   292                              <1> 	; 28/11/2020
   293 00001804 803D[1C120300]00    <1> 	cmp	byte [pmi32], 0		; 32 bit protected mode interface for
   294 0000180B 7634                <1> 	jna	short VGA_funcs_0	; video hardware's vga bios firmware
   295                              <1> 					; ([pmi32] > 0 if it is activated)
   296                              <1> 					; note:
   297                              <1> 					; [vbe3] = 3 is required to activate
   298                              <1> 	; 07/12/2020
   299 0000180D 20E4                <1> 	and	ah, ah ; is this set mode ?
   300 0000180F 7413                <1> 	jz	short vbe_pmi32_2 ; yes
   301                              <1> 
   302 00001811 80FC04              <1> 	cmp	ah, 04h	 ; set mode ('no clear memory' option)
   303 00001814 742B                <1> 	je	short VGA_funcs_0
   304                              <1> 
   305                              <1> 	; 07/12/2020
   306 00001816 803D[BA6F0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; current mode > 7 ?
   307 0000181D 7622                <1> 	jna	short VGA_funcs_0  ; no	
   308                              <1> 
   309                              <1> 	; when mode 3 is active, 
   310                              <1> 	; video bios functions are not redirected
   311                              <1> 	; to VESA VBE3 PMI except 'set mode' function
   312                              <1> 
   313                              <1> vbe_pmi32_0:
   314                              <1> 	; 06/12/2020
   315                              <1> 	;or	ah, ah
   316                              <1> 	;jnz	short vbe_pmi32_2
   317                              <1> 	; ah = 0 ; 'set mode'
   318                              <1> 	;cmp	al, 3 ; 80x25 text mode, 16 colors, default mode for MainProg
   319                              <1> 	;jne	short vbe_pmi32_1
   320                              <1> 	;cmp	byte [CRT_MODE], 3 ; If current video mode <> 3 and requested
   321                              <1> 	;			; video mode is 3, use internal 'set mode';
   322                              <1> 	;			; otherwise, use vesa vbe 3 bios's 'set mode'.
   323                              <1> 	;jne	short VGA_funcs_0
   324                              <1> vbe_pmi32_1:
   325 0000181F E963010000          <1> 	jmp	vesa_vbe3_pmi
   326                              <1> ;vbe_pmi32_2:
   327                              <1> 	;cmp	ah, 04h ; set mode (no clear mem option)
   328                              <1> 	;jne	short vbe_pmi32_1
   329                              <1> 
   330                              <1> vbe_pmi32_2:
   331                              <1> 	; 07/12/2020
   332 00001824 803D[BA6F0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; current mode > 7 ?
   333 0000182B 77F2                <1> 	ja	short vbe_pmi32_1  ; yes
   334                              <1> 
   335 0000182D 3C07                <1> 	cmp	al, 7	; requested mode > 7 ?
   336 0000182F 7610                <1> 	jna	short VGA_funcs_0  ; no (CGA)
   337                              <1> 
   338 00001831 3C13                <1> 	cmp	al, 13h
   339 00001833 76EA                <1> 	jna	short vbe_pmi32_1
   340                              <1> 
   341 00001835 A880                <1> 	test	al, 80h
   342 00001837 7408                <1> 	jz	short VGA_funcs_0  ; unknown or special
   343                              <1> 
   344 00001839 3C87                <1> 	cmp	al, 87h	; requested mode > 7 ? 
   345                              <1> 			; (with no clear mem ops)
   346 0000183B 7604                <1> 	jna	short VGA_funcs_0  ; no (CGA)
   347                              <1> 
   348 0000183D 3C93                <1> 	cmp	al, 93h
   349 0000183F 76DE                <1> 	jna	short vbe_pmi32_1
   350                              <1> 
   351                              <1> 	; > 13h video modes are unknown or special
   352                              <1>  	; they must be handled by kernel	
   353                              <1> 
   354                              <1> 	; CGA video modes will be handled by kernel		
   355                              <1> 
   356                              <1> VGA_funcs_0:
   357 00001841 52                  <1> 	push	edx ; ***
   358 00001842 51                  <1> 	push	ecx ; ****
   359 00001843 53                  <1> 	push	ebx ; *****
   360 00001844 56                  <1> 	push	esi ; ******
   361 00001845 57                  <1> 	push	edi ; *******
   362 00001846 55                  <1> 	push	ebp ; ********
   363                              <1> 
   364                              <1> 	;mov	[video_eax], eax ; 12/05/2016 
   365 00001847 BF00800B00          <1> 	mov	edi, 0B8000h		; GET offset FOR COLOR CARD
   366                              <1> 
   367                              <1> 	; 23/03/2016
   368 0000184C C0E402              <1> 	shl	ah, 2  ; dword		; TIMES 2 FOR WORD TABLE LOOKUP
   369 0000184F 0FB6F4              <1> 	movzx	esi, ah			; MOVE OFFSET INTO LOOK UP REGISTER (SI)
   370                              <1> 	;mov	ah, [CRT_MODE]		; MOVE CURRENT MODE INTO (AH) REGISTER
   371                              <1> 
   372                              <1> 	;;15/01/2017
   373                              <1> 	; 14/01/2017
   374                              <1> 	; 02/01/2017
   375                              <1> 	;;mov	byte [intflg], 31h  ; video interrupt
   376                              <1> 	;sti ; 26/11/2020
   377                              <1> 	;
   378                              <1> 
   379 00001852 FFA6[71170000]      <1> 	JMP	dword [esi+M1]		; GO TO SELECTED FUNCTION
   380                              <1> 
   381                              <1> VBE_func:
   382                              <1> 	; 26/11/2020
   383                              <1> 	;sti
   384 00001858 55                  <1> 	push	ebp ; *** ; 27/11/2020	
   385 00001859 56                  <1> 	push	esi ; **** 
   386                              <1> 	
   387                              <1> 	; Note:
   388                              <1> 	; ebx, ecx, edx, edi, ebp registers
   389                              <1> 	; must be saved by VBE functions and
   390                              <1> 	; eax register must be set
   391                              <1> 	; (according to VBE 3 standard)
   392                              <1> 	; before return from this interrupt
   393                              <1> 	; (every function must restore and set
   394                              <1> 	; registers except esp, esi, es, ds)
   395                              <1> 
   396 0000185A 803D[54090000]02    <1> 	cmp	byte [vbe3], 2
   397 00001861 7741                <1> 	ja	short VESA_VBE3_PMI_CALL ; VBE3 video bios ('PMID')
   398                              <1> 	;je	short VBE_func_0  ; Bochs/Qemu/VirtualBox emulator
   399 00001863 726A                <1> 	jb	short VBE_unknown ; invalid ([vbe3] = 0)
   400                              <1> 
   401                              <1> 	;jmp	VESA_VBE3_PMI_CALL
   402                              <1> 
   403                              <1> VBE_func_0:	
   404                              <1> 	; Bochs/Plex86 VGAbios VBE extension
   405                              <1> 	; (TRDOS 386 v2.0.3 can use VBE graphics modes on emulators)
   406                              <1> 	; BOCHS/QEMU/VIRTUALBOX
   407                              <1>  
   408 00001865 8A25[55090000]      <1> 	mov	ah, [vbe2bios]
   409 0000186B 80FCC0              <1> 	cmp	ah, 0C0h		
   410 0000186E 725F                <1> 	jb	short VBE_unknown 	
   411 00001870 80FCC5              <1> 	cmp	ah, 0C5h
   412 00001873 775A                <1> 	ja	short VBE_unknown
   413                              <1> 
   414                              <1> 	; TRDOS 386 is running on BOCHS or QEMU
   415 00001875 B44F                <1> 	mov	ah, 4Fh
   416                              <1> VBE_func_1:
   417 00001877 0FB6F0              <1> 	movzx	esi, al ; VESA VBE function number
   418 0000187A 66C1E602            <1> 	shl	si, 2 ; dword
   419 0000187E 6683FE14            <1> 	cmp	si, N1L
   420 00001882 734B                <1> 	jnb	short VBE_unknown
   421                              <1> 	;sti
   422                              <1> 	
   423 00001884 FF96[90180000]      <1> 	call	dword [esi+N1] ; call VBE function
   424                              <1> 		
   425                              <1> 	;jmp	short VBE_bios_return
   426                              <1> 
   427                              <1> VBE_bios_return:
   428 0000188A FA                  <1> 	cli
   429 0000188B 5E                  <1> 	pop	esi ; ****
   430 0000188C 5D                  <1> 	pop	ebp ; *** ; 27/11/2020
   431 0000188D 07                  <1> 	pop	es  ; **
   432 0000188E 1F                  <1> 	pop	ds  ; *
   433 0000188F CF                  <1> 	iretd
   434                              <1> 
   435                              <1> 	; 26/11/2020
   436                              <1> N1:
   437 00001890 [F3180000]          <1> 	dd	vbe_biosfn_return_ctrl_info
   438 00001894 [163A0000]          <1> 	dd	vbe_biosfn_return_mode_info
   439 00001898 [D13A0000]          <1> 	dd	vbe_biosfn_set_mode
   440 0000189C [A13B0000]          <1> 	dd	vbe_biosfn_return_current_mode
   441 000018A0 [C03B0000]          <1> 	dd	vbe_biosfn_save_restore_state
   442                              <1> 	;dd	vbe_biosfn_display_window_ctrl
   443                              <1> 	;dd	vbe_biosfn_set_get_log_scanline
   444                              <1> 	;dd	vbe_biosfn_set_get_disp_start
   445                              <1> 	;dd	vbe_biosfn_set_get_dac_pal_frm
   446                              <1> 	;dd	vbe_biosfn_set_get_palette_data
   447                              <1> 	
   448                              <1> N1L	EQU	$ - N1
   449                              <1> 
   450                              <1> 
   451                              <1> VESA_VBE3_PMI_CALL: ; VESA VBE video bios (firmware) functions
   452                              <1> 		    ; by using VESA VBE3 Protected Mode Interface
   453                              <1> 	
   454                              <1> 	; 29/11/2020
   455                              <1> 	; 26/11/2020 - TRDOS 386 v2.0.3 video.s
   456                              <1> 
   457                              <1> 	; We are here because..
   458                              <1> 	; 'PMID' has been verified by TRDOS 386 v2.0.3 kernel.
   459                              <1> 	; (Otherwise bochs/plex86 compatible VBE functions and
   460                              <1> 	;  modes would be used on BOCHS/QEMU/VIRTUALBOX emulators
   461                              <1> 	;  or only standard/old VGA graphics modes would be used.)   	
   462                              <1> 
   463                              <1> 	; (TRDOS 386 v2.0.3 can use VESA VBE graphics modes if
   464                              <1> 	;  the video bios is full compatible with VBE3 standard) 
   465                              <1> 
   466                              <1> 	; 29/11/2020
   467                              <1> 
   468 000018A4 0FB6F0              <1> 	movzx	esi, al ; VESA VBE 3 function number
   469 000018A7 66C1E602            <1> 	shl	si, 2 ; dword
   470 000018AB 6683FE14            <1> 	cmp	si, P1L
   471 000018AF 731E                <1> 	jnb	short VBE_unknown
   472                              <1> 	;sti
   473                              <1> 
   474 000018B1 57                  <1> 	push	edi ; *****
   475                              <1> 		
   476 000018B2 FF96[BB180000]      <1> 	call	dword [esi+P1] ; call VBE 3 function
   477                              <1> 
   478 000018B8 5F                  <1> 	pop	edi ; *****
   479                              <1> 		
   480 000018B9 EBCF                <1> 	jmp	short VBE_bios_return
   481                              <1> 
   482                              <1> P1:
   483 000018BB [D5180000]          <1> 	dd	vbe3_pmfn_return_ctrl_info
   484 000018BF [F9180000]          <1> 	dd	vbe3_pmfn_return_mode_info
   485 000018C3 [36190000]          <1> 	dd	vbe3_pmfn_set_mode
   486 000018C7 [31190000]          <1> 	dd	vbe3_pmfn_return_current_mode
   487 000018CB [281A0000]          <1> 	dd	vbe3_pmfn_save_restore_state
   488                              <1> 	;dd	vbe3_pmfn_display_window_ctrl
   489                              <1> 	;dd	vbe3_pmfn_set_get_log_scanline
   490                              <1> 	;dd	vbe3_pmfn_set_get_disp_start
   491                              <1> 	;dd	vbe3_pmfn_set_get_dac_pal_frm
   492                              <1> 	;dd	vbe3_pmfn_set_get_palette_data
   493                              <1> 	;dd	vbe3_pmfn_return_pmi ; invalid for TRDOS 386 v2
   494                              <1> 	;dd	vbe3_pmfn_set_get_pixel_clock
   495                              <1> 	
   496                              <1> P1L	EQU	$ - P1
   497                              <1> 
   498                              <1> ;	; 29/11/2020
   499                              <1> ;	mov	edi, VBE3MODEINFOBLOCK >> 4 ; / 16
   500                              <1> ;	
   501                              <1> ;	cmp	al, 04h
   502                              <1> ;	jb	short vbe3_pm_f ; function: 4F00h to 4F03h
   503                              <1> ;	ja	short vbe3_pmi_f5B ; function: 4F05h to 4F0Bh
   504                              <1> ;
   505                              <1> ;	; check buffer length (must be <= 2048 bytes)
   506                              <1> ;
   507                              <1> ;	and	dl, dl ; 0
   508                              <1> ;	jz	short vbe3_pm_f 
   509                              <1> ;		       ; Return Save/Restore State buffer size
   510                              <1> ;
   511                              <1> ;	push	ebx  ; buffer address
   512                              <1> ;	push	edx  ; function: save (01h) or restore (02h)
   513                              <1> ;	call	
   514                              <1> ;
   515                              <1> ;vbe3_pm_f03:
   516                              <1> ;	cmp	al, 2
   517                              <1> ;	ja	short vbe3_pm_f ; function 4F03h
   518                              <1> ;	jb	short vbe3_pm_f1
   519                              <1> ;
   520                              <1> ;
   521                              <1> ;vbe3_pm_f1:
   522                              <1> ;	
   523                              <1> ;
   524                              <1> ;vbe3_pmi_f5B:
   525                              <1> ;	cmp	al, 09h
   526                              <1> ;	jna	short vbe3_pm_f ; funcs 05h to 09h are usable 
   527                              <1> ;	
   528                              <1> ;	cmp	al, 0Bh ; Get/Set pixel clock, last function
   529                              <1> ;	jne	short VBE_unknown 
   530                              <1> ;			; (do not use 'uncertain' functions
   531                              <1> ;			; because of system-user buff transfers) 	
   532                              <1> ;vbe3_pm_f:
   533                              <1> ;	mov	byte [vbe3_pm_fn], al	; set
   534                              <1> ;	; prepare 16 bit pm segments & registers for pmi call 
   535                              <1> ;	call	VESA_VBE3_PM_FUNCTION
   536                              <1> ;
   537                              <1> ;
   538                              <1> 
   539                              <1> 	; 26/11/2020
   540                              <1> VBE_unknown:
   541 000018CF 66B80001            <1> 	mov	ax, 0100h  ; ah = 1 : Function call failed	
   542                              <1> 			   ; al = 0 : Function is not supported	
   543                              <1> 	
   544 000018D3 EBB5                <1> 	jmp	short VBE_bios_return
   545                              <1> 
   546                              <1> vbe3_pmfn_return_ctrl_info:
   547                              <1> 	; 12/12/2020
   548                              <1> 	;
   549                              <1> 	; VBE function 4F00h - Return VBE Controller Information
   550                              <1> 	;
   551                              <1> 	; Input:
   552                              <1> 	;      EDI = Pointer to buffer in which to place
   553                              <1> 	;	     VbeInfoBlock structure
   554                              <1> 	;
   555                              <1> 	;	AX = 4F00h
   556                              <1> 	; Output:
   557                              <1> 	;	AX = VBE return status
   558                              <1> 	;	     AX = 004Fh -> succeeded
   559                              <1> 	;	     AX <> 004Fh -> failed   
   560                              <1> 	; 
   561                              <1> 	; Modified registers: eax (+ edi for kernel's own call)
   562                              <1> 
   563                              <1> 	; NOTE: TRDOS 386 v2 (v2.0.3) kernel calls this function
   564                              <1> 	; during startup while cpu is in real mode
   565                              <1> 	; (by using int 10h, 4F02h) and saves VbeInfoBlock at
   566                              <1> 	; VBE3INFOBLOCK address (97E00h for TRDOS 386 v2.0.3).
   567                              <1> 	;	
   568                              <1> 	; So...
   569                              <1> 	; This VBE function is adjusted to return/move same info	
   570                              <1> 	; from VBE3INFOBLOCK to user's buffer in EDI.
   571                              <1> 
   572                              <1> 	; int 31h (int 10h) entrance
   573                              <1> 
   574 000018D5 21FF                <1> 	and	edi, edi
   575 000018D7 7424                <1> 	jz	short vbe3_func_fail ; invalid buffer address !
   576                              <1> 
   577                              <1> ;_vbe3_pmfn_return_ctrl_info:		
   578                              <1> 	;or	edi, edi
   579                              <1> 	;jnz	short _vbe_biosfn_return_ctrl_info
   580                              <1> 	;
   581                              <1> 	;; this option may not be necessary - 12/12/2020
   582                              <1> 	;
   583                              <1> 	;; edi = 0, kernel forces to get ctrl info again
   584                              <1> 	;;	   by using VESA VBE3 video bios's pmi
   585                              <1> 	;
   586                              <1> 	;;push	edi
   587                              <1> 	;; far call to VESA VBE3 PMI 
   588                              <1> 	;;mov	ax, 4F00h ; Return VBE Controller Info
   589                              <1> 	;mov	edi, VBE3INFOBLOCK-VBE3SAVERESTOREBLOCK
   590                              <1> 	;; ES selector base address = VBE3SAVERESTOREBLOCK 
   591                              <1> 	;call	int10h_32bit_pmi
   592                              <1> 	;;pop	edi
   593                              <1> 	;mov	edi, VBE3INFOBLOCK ; retn to the kernel sub
   594                              <1> 	;cmp	ax, 004Fh
   595                              <1> 	;je	short vbe_ctrl_info_retn
   596                              <1> 	;stc	
   597                              <1> 	;retn
   598                              <1> 
   599                              <1> _vbe_biosfn_return_ctrl_info:
   600 000018D9 57                  <1> 	push	edi
   601 000018DA 51                  <1> 	push	ecx
   602 000018DB BE007E0900          <1> 	mov	esi, VBE3INFOBLOCK
   603 000018E0 B900020000          <1> 	mov	ecx, 512
   604 000018E5 E8DAF90000          <1> 	call	transfer_to_user_buffer
   605 000018EA 59                  <1> 	pop	ecx
   606 000018EB 5F                  <1> 	pop	edi
   607 000018EC 720F                <1> 	jc	short vbe3_func_fail
   608                              <1> 
   609 000018EE 31C0                <1> 	xor	eax, eax
   610 000018F0 B04F                <1> 	mov	al, 4Fh ; successful
   611                              <1> ;vbe_ctrl_info_retn:
   612 000018F2 C3                  <1> 	retn
   613                              <1> 
   614                              <1> vbe_biosfn_return_ctrl_info:
   615                              <1> 	; 12/12/2020
   616                              <1> 	;
   617                              <1> 	; VBE function 4F00h - Return VBE Controller Information
   618                              <1> 	;
   619                              <1> 	; Input:
   620                              <1> 	;      EDI = Pointer to buffer in which to place
   621                              <1> 	;	     VbeInfoBlock structure
   622                              <1> 	;
   623                              <1> 	;	AX = 4F00h
   624                              <1> 	; Output:
   625                              <1> 	;	AX = VBE return status
   626                              <1> 	;	     AX = 004Fh -> succeeded
   627                              <1> 	;	     AX <> 004Fh -> failed   
   628                              <1> 	; 
   629                              <1> 	; Modified registers: eax
   630                              <1> 
   631 000018F3 21FF                <1> 	and	edi, edi
   632 000018F5 7406                <1> 	jz	short vbe3_func_fail ; invalid buffer addr !
   633 000018F7 EBE0                <1> 	jmp	short _vbe_biosfn_return_ctrl_info 
   634                              <1> 
   635                              <1> vbe3_pmfn_return_mode_info:
   636                              <1> 	; 21/12/2020
   637                              <1> 	; 12/12/2020
   638                              <1> 	;
   639                              <1> 	; VBE function 4F01h - Return VBE Mode Information
   640                              <1> 	;
   641                              <1> 	; Input:
   642                              <1> 	;	CX = Mode number (VESA VBE mode number)
   643                              <1> 	;      EDI = Pointer to ModeInfoBlock structure
   644                              <1> 	;	     (256 bytes) -User's buffer address-
   645                              <1> 	;      EDI = 0 -> kernel call
   646                              <1> 	;		  (do not transfer ModeInfoBlock
   647                              <1> 	;		  to user's buffer address)
   648                              <1> 	;	AX = 4F01h	
   649                              <1> 	; Output:
   650                              <1> 	;	AX = VBE return status
   651                              <1> 	;	     AX = 004Fh -> succeeded
   652                              <1> 	;	     AX <> 004Fh -> failed   
   653                              <1> 	; 
   654                              <1> 	; Modified registers: eax, esi, edi
   655                              <1> 
   656                              <1> 	; int 31h (int 10h) entrance
   657                              <1> 	
   658 000018F9 09FF                <1> 	or	edi, edi
   659 000018FB 7506                <1> 	jnz	short _vbe3_pmfn_return_mode_info
   660                              <1> 
   661                              <1> vbe3_func_fail:
   662 000018FD B84F010000          <1> 	mov	eax, 014Fh ; ah = 1 : Function call failed	
   663                              <1> 			   ; al = 4Fh : Function is supported
   664 00001902 C3                  <1> 	retn
   665                              <1> 	
   666                              <1> 	; jump from '_vbe_biosfn_return_mode_info' 
   667                              <1> _vbe3_pmfn_return_mode_info:
   668 00001903 57                  <1> 	push	edi
   669                              <1> 
   670                              <1> 	;; clear vbe3 'mode info block' buffer
   671                              <1> 	;push	ecx
   672                              <1> 	;xor	eax, eax
   673                              <1> 	;mov	ecx, 256/4
   674                              <1> 	;mov	edi, VBE3MODEINFOBLOCK
   675                              <1> 	;rep	stosd
   676                              <1> 	;pop	ecx
   677                              <1> 
   678                              <1> 	; far call to VESA VBE3 PMI 
   679                              <1> 	;mov	ax, 4F01h ; Return VBE Mode Information
   680 00001904 BF00060000          <1> 	mov	edi, VBE3MODEINFOBLOCK-VBE3SAVERESTOREBLOCK
   681                              <1> 	; ES selector base address = VBE3SAVERESTOREBLOCK 
   682 00001909 E8FC000000          <1> 	call	int10h_32bit_pmi
   683                              <1> 
   684 0000190E 5F                  <1> 	pop	edi
   685                              <1> 
   686                              <1> 	;cmp	ax, 004Fh
   687                              <1> 	;jne	short vbe3_func_retn  ; failed !
   688                              <1> 
   689 0000190F 21FF                <1> 	and	edi, edi
   690                              <1> 	;jz	short vbe3_func_success
   691                              <1> 	; 21/12/2020
   692 00001911 741D                <1> 	jz	short vbe3_func_retn
   693                              <1> 
   694 00001913 6683F84F            <1> 	cmp	ax, 004Fh
   695 00001917 7517                <1> 	jne	short vbe3_func_retn  ; failed !
   696                              <1> 
   697 00001919 51                  <1> 	push	ecx
   698 0000191A BE007C0900          <1> 	mov	esi, VBE3MODEINFOBLOCK		
   699 0000191F B900010000          <1> 	mov	ecx, 256
   700 00001924 E89BF90000          <1> 	call	transfer_to_user_buffer
   701 00001929 59                  <1> 	pop	ecx
   702 0000192A 72D1                <1> 	jc	short vbe3_func_fail
   703                              <1> 
   704 0000192C 31C0                <1> 	xor	eax, eax
   705 0000192E B04F                <1> 	mov	al, 4Fh ; successful
   706                              <1> vbe3_func_success:
   707                              <1> vbe3_func_retn:	
   708 00001930 C3                  <1> 	retn
   709                              <1> 
   710                              <1> vbe3_pmfn_return_current_mode:
   711                              <1> 	; 12/12/2020
   712                              <1> 	;
   713                              <1> 	; VBE function 4F03h - Return Current VBE Mode
   714                              <1> 	;
   715                              <1> 	; Input:
   716                              <1> 	;	none (AX = 4F03h)
   717                              <1> 	; Output:
   718                              <1> 	;	AX = VBE return status
   719                              <1> 	;	     AX = 004Fh -> succeeded
   720                              <1> 	;	     AX <> 004Fh -> failed
   721                              <1> 	;	BX = Current VBE mode
   722                              <1> 	;	  bit 0-13 = Mode number
   723                              <1> 	;	  bit 14 = 0 Windowed frame buffer model
   724                              <1> 	;	         = 1 Linear frame buffer model
   725                              <1> 	;	  bit 15 
   726                              <1> 	;	      = 0 Memory cleared at last mode set
   727                              <1> 	;	      = 1 Memory not cleared at last mode set
   728                              <1> 	; 
   729                              <1> 	; Modified registers: eax, ebx
   730                              <1> 
   731                              <1> 	; int 31h (int 10h) entrance
   732                              <1> 	
   733                              <1> 	; far call to VESA VBE3 PMI 
   734                              <1> 
   735                              <1> 	;mov	eax, 4F03h ; Return Current VBE Mode
   736                              <1> vbe3_pmfn_far_call:
   737                              <1> 	; ES selector base address = VBE3SAVERESTOREBLOCK 
   738                              <1> 	;call	int10h_32bit_pmi
   739                              <1> 	;retn
   740 00001931 E9D4000000          <1> 	jmp	int10h_32bit_pmi
   741                              <1> 
   742                              <1> vbe3_pmfn_set_mode:
   743                              <1> 	; 22/12/2020
   744                              <1> 	; 21/12/2020
   745                              <1> 	; 12/12/2020
   746                              <1> 	;
   747                              <1> 	; VBE function 4F02h - Set VBE Mode
   748                              <1> 	;
   749                              <1> 	; Input:
   750                              <1> 	;	BX = Desired Mode to set
   751                              <1> 	;	  bit 0-13 = Mode number
   752                              <1> 	;	  bit 14 = 0 Windowed frame buffer model
   753                              <1> 	;	         = 1 Linear frame buffer model
   754                              <1> 	;	  bit 15 
   755                              <1> 	;	      = 0 Memory cleared at last mode set
   756                              <1> 	;	      = 1 Memory not cleared at last mode set
   757                              <1> 	; Output:
   758                              <1> 	;	AX = VBE return status
   759                              <1> 	;	     AX = 004Fh -> succeeded
   760                              <1> 	;	     AX <> 004Fh -> failed
   761                              <1> 	; 
   762                              <1> 	; Modified registers: eax, ebx, esi (21/12/2020)
   763                              <1> 
   764                              <1> 	; int 31h (int 10h) entrance
   765                              <1> 
   766                              <1> 	; 22/12/2020 (VESA VBE3 feature)
   767                              <1> 	; BX bit 11 is flag for
   768                              <1> 	;	user specified CRTC values for refresh rate
   769                              <1> 	; 'test bh, 8'
   770                              <1> 	; if bit 11 is set, EDI points to 'CRTCInfoBlock'
   771                              <1> 
   772                              <1> 	; 22/12/2020
   773                              <1> 	;; test bx for VBE video mode
   774                              <1> 	;test	bh, 1
   775                              <1> 	;jnz	short vbe3_sm_0
   776                              <1> 
   777                              <1> 	;; use internal VBE mode set procedure
   778                              <1> 	;; for non-vbe (std VGA/CGA) modes
   779                              <1> 	;
   780                              <1> 	;; (it is useful -as 4F02h function- 
   781                              <1> 	;;  to jump 'vbe_biosfn_set_mode'
   782                              <1> 	;;  instead of direct jump to '_set_mode')
   783                              <1> 	;; ((eliminates additional push-pops and settings))  
   784                              <1>  
   785                              <1> 	;jmp	vbe_biosfn_set_mode	
   786                              <1> 
   787                              <1> vbe3_sm_0: 
   788                              <1> 	;;push	ds  ; *
   789                              <1> 	;;push	es  ; **
   790                              <1> 	;;push	ebp ; ***
   791                              <1> 	;;push	esi ; **** 
   792                              <1> 	
   793                              <1> 	; Fit bx to VESA VBE2 type mode setting
   794                              <1> 	; (bx bit 11 is used for custom CRTC values in VBE3)
   795                              <1> 	; clear bit 9 to 11 (clear bh bit 1 to bit 3)
   796                              <1> 
   797                              <1> 	; 22/12/2020
   798 00001936 57                  <1> 	push	edi ; *****
   799 00001937 F6C708              <1> 	test	bh, 8	; Use user specified CRTC values
   800 0000193A 7530                <1> 	jnz	short vbe3_sm_3  ; for refresh rate
   801                              <1> vbe3_sm_4:
   802 0000193C 80E7C1              <1> 	and	bh, 0C1h ; use bit 15, 14, 8 only (for bh)
   803                              <1> 	;mov	[vbe_mode_x], bh
   804                              <1> 
   805 0000193F 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 3 ; is current mode 03h ?
   806 00001946 7509                <1> 	jne	short vbe3_sm_1    ; no
   807                              <1> 
   808                              <1> 	; save mode 03h video pages and cursor positions
   809 00001948 57                  <1> 	push	edi ; **!***	
   810 00001949 51                  <1> 	push	ecx ; ******
   811                              <1> 	;push	esi
   812                              <1> 	
   813 0000194A E8CE040000          <1> 	call	save_mode3_multiscreen
   814                              <1> 	
   815                              <1> 	;pop	esi
   816 0000194F 59                  <1> 	pop	ecx ; ******
   817 00001950 5F                  <1> 	pop	edi ; **!***		
   818                              <1> vbe3_sm_1:
   819                              <1> 	; ax = 4F02h
   820                              <1> 	; bx = video mode number (vbe2 type)	
   821 00001951 E8B4000000          <1> 	call	int10h_32bit_pmi 
   822                              <1> 			; call to far call to VBE3 PMI
   823                              <1> 
   824 00001956 6683F84F            <1> 	cmp	ax, 004Fh ; succeeded ?
   825 0000195A 750E                <1> 	jne	short vbe3_sm_2
   826                              <1> 	; set current mode byte/sign to extended (SVGA) mode
   827 0000195C C605[BA6F0000]FF    <1> 	mov	byte [CRT_MODE], 0FFh ; VESA VBE mode
   828                              <1> 	; set current VBE mode word to bx input
   829 00001963 66891D[1E120300]    <1> 	mov	[video_mode], bx
   830                              <1> vbe3_sm_2:
   831                              <1> 	; 22/12/2020
   832 0000196A 5F                  <1> 	pop	edi ; ***** 
   833 0000196B C3                  <1> 	retn
   834                              <1> 
   835                              <1> vbe3_sm_3:
   836                              <1> 	; 22/12/2020
   837                              <1> 	; copy user's CRTCInfoBlock to the buffer
   838 0000196C 51                  <1> 	push	ecx
   839 0000196D 89FE                <1> 	mov	esi, edi
   840 0000196F BF807D0900          <1> 	mov	edi, VBE3CRTCINFOBLOCK
   841 00001974 B940000000          <1> 	mov	ecx, 64
   842 00001979 E890F90000          <1> 	call	transfer_from_user_buffer
   843 0000197E 59                  <1> 	pop	ecx
   844                              <1> 	; set offset (es base addr is VBE3SAVERESTOREBLOCK) 
   845 0000197F 81EF00760900        <1> 	sub	edi, VBE3SAVERESTOREBLOCK
   846 00001985 EBB5                <1> 	jmp	short vbe3_sm_4
   847                              <1> 	
   848                              <1> vesa_vbe3_pmi:
   849                              <1> 	; 12/12/2020
   850                              <1> 	; 08/12/2020
   851                              <1> 	; 07/12/2020
   852                              <1> 	; 05/12/2020, 06/12/2020
   853                              <1> 	; 03/12/2020, 04/12/2020
   854                              <1> 	; 28/11/2020 (TRDOS 386 v2.0.3)
   855                              <1> 	; VGA BIOS functions via
   856                              <1> 	; VESA VBE3 Protected Mode Inface
   857                              <1> 	; [vbe3] = 3 and [pmi32] > 0
   858                              <1> 
   859                              <1> 	; 04/12/2020
   860                              <1> 	; Only 'set mode' will be redirected to vbe3 video bios
   861                              <1> 	; (by setting mode 3 multiscreen paraters before and after) 
   862                              <1> 
   863                              <1> 	; 06/12/2020
   864 00001987 20E4                <1> 	and	ah, ah	; 0 = set mode function
   865 00001989 7402                <1> 	jz	short vbe3_pmi_0
   866 0000198B EB76                <1> 	jmp	vbe3_pmi_9 
   867                              <1> 
   868                              <1> vbe3_pmi_0:
   869                              <1> 	; 07/12/2020
   870 0000198D 88C4                <1> 	mov	ah, al
   871 0000198F 80E480              <1> 	and	ah, 80h ; 0 or 80h
   872 00001992 30E0                <1> 	xor	al, ah ; 8?h -> 0?h
   873                              <1> 
   874                              <1> 	;cmp	al, 13h ; mode number above 13h is returned
   875                              <1> 	;jna	short vbe3_pmi_1
   876                              <1> 	;		; back to default code due to uncertainty
   877                              <1> 	; 		; (>13h is not std for all svga bioses)
   878                              <1> 	;jmp	VGA_funcs_0
   879                              <1> vbe3_pmi_1:
   880                              <1> 	; 07/12/2020
   881                              <1> 	; Possible cases for VBE3 (PMI, ah=0) set mode:
   882                              <1> 	; current mode > 07h and requested mode: any 
   883                              <1> 	; current mode <= 07h and requested mode > 07h
   884                              <1> 
   885                              <1> 	; 06/12/2020
   886 00001994 8825[278E0100]      <1> 	mov	byte [noclearmem], ah ; 0 or 80h
   887                              <1> 	; check current video mode if it is 03h
   888 0000199A 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 3 ; current mode
   889 000019A1 750B                <1> 	jne	short vbe3_pmi_3
   890                              <1> 	; 07/12/2020
   891                              <1> 	; check new video mode if it is 03h also
   892                              <1> 	;cmp	al, 3
   893                              <1> 	;jne	short vbe3_pmi_2
   894                              <1> 	;mov	byte [p_crt_mode], 80h 	; clear video memory
   895                              <1> 	;jmp	short vbe3_pmi_5
   896                              <1> vbe3_pmi_2:
   897                              <1> 	; case 1:
   898                              <1> 	; Current mode is 03h and new mode is not 03h
   899                              <1> 
   900                              <1> 	; save video pages and cursor positions
   901 000019A3 56                  <1> 	push	esi
   902 000019A4 57                  <1> 	push	edi
   903 000019A5 51                  <1> 	push	ecx
   904                              <1> 
   905                              <1> 	; 12/12/2020
   906                              <1> 	;mov	esi, 0B8000h ; mode 3 video memory
   907                              <1> 	;mov	edi, 98000h  ; backup location
   908                              <1> 	;mov	ecx, (0B8000h-0B0000h)/4
   909                              <1> 	;rep	movsd
   910                              <1> 	;
   911                              <1> 	;mov	byte [p_crt_mode], 3 ; previous mode, backup sign
   912                              <1> 	;xchg	cl, [ACTIVE_PAGE]
   913                              <1> 	;mov	[p_crt_page], cl  ; save as previous active page	
   914                              <1> 	;
   915                              <1> 	;; save cursor positions
   916                              <1> 	;mov	esi, CURSOR_POSN
   917                              <1> 	;mov	edi, cursor_pposn ; cursor positions backup
   918                              <1> 	;mov	cl, 4
   919                              <1> 	;rep	movsd
   920                              <1> 
   921                              <1> 	; 12/12/2020
   922 000019A6 E872040000          <1> 	call	save_mode3_multiscreen
   923                              <1> 
   924 000019AB 59                  <1> 	pop	ecx
   925 000019AC 5F                  <1> 	pop	edi
   926 000019AD 5E                  <1> 	pop	esi
   927                              <1> vbe3_pmi_3:
   928                              <1> 	; 08/12/2020
   929                              <1> 	; 07/12/2020
   930                              <1> 	; case 3 or case 4
   931 000019AE A2[BA6F0000]        <1> 	mov	[CRT_MODE], al
   932 000019B3 3C03                <1> 	cmp	al, 3
   933 000019B5 7407                <1> 	je	short vbe3_pmi_4
   934                              <1> 	; case 4:
   935                              <1> 	; Current mode is not 03h and also new mode is not 03h
   936 000019B7 800D[258E0100]80    <1> 	or	byte [p_crt_mode], 80h  ; 83h (case 1 -> case 4)
   937                              <1> 	;jmp	short vbe3_pmi_5
   938                              <1> vbe3_pmi_4:
   939                              <1> 	; case 3:
   940                              <1> 	;
   941                              <1> 	; Current mode is not 03h and new mode is 03h
   942                              <1> 
   943                              <1> ;vbe3_pmi_5:
   944                              <1> 	;mov	[CRT_MODE], al
   945                              <1> 
   946 000019BE E847000000          <1> 	call	int10h_32bit_pmi	
   947                              <1> 
   948 000019C3 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 3  ; new video mode
   949                              <1> 	;jne	vbe3_pmi_8	; video mode <> 03h
   950 000019CA 7532                <1> 	jne	short vbe3_pmi_8	
   951                              <1> 
   952                              <1> 	;push	eax ; 04/12/2020
   953 000019CC 53                  <1> 	push	ebx
   954 000019CD 51                  <1> 	push	ecx
   955 000019CE 52                  <1> 	push	edx
   956 000019CF 57                  <1> 	push	edi ; 03/12/2020
   957                              <1> 
   958                              <1> 	; 12/12/2020
   959 000019D0 56                  <1> 	push	esi
   960 000019D1 E87A040000          <1> 	call	restore_mode3_multiscreen
   961 000019D6 5E                  <1> 	pop	esi
   962                              <1> 	; AL = active video page
   963                              <1> 
   964                              <1> 	; 12/12/2020
   965                              <1> 	;mov	al, [p_crt_page] ; previous mode 3 active page
   966                              <1> 	;
   967                              <1> 	;;test	byte [p_crt_mode], 7Fh ; 83h or 80h or 03h
   968                              <1> 	;;jz	short vbe3_pmi_6 ; do not restore video pages
   969                              <1> 	;			 ; clear current video page
   970                              <1> 	;; case 3
   971                              <1> 	;
   972                              <1> 	;; ([p_crt_mode] = 03h)
   973                              <1> 	;
   974                              <1> 	;; New video mode is 3 while current video mode is not 3
   975                              <1> 	;; (multi screen) video pages will be restored from 098000h
   976                              <1> 	;
   977                              <1> 	;; restore video pages and cursor positions
   978                              <1> 	;
   979                              <1> 	;mov	[ACTIVE_PAGE], al ; current mode 3 active page
   980                              <1> 	;
   981                              <1> 	;push	esi
   982                              <1> 	;
   983                              <1> 	;; restore video pages
   984                              <1> 	;mov	esi, 98000h
   985                              <1> 	;mov	edi, 0B8000h
   986                              <1> 	;;mov	ecx, 2000h
   987                              <1> 	;mov	cx, 2000h ; 8K dwords (32K)
   988                              <1> 	;rep	movsd
   989                              <1> 	;
   990                              <1> 	;mov	[p_crt_mode], cl ; reset ('case 3' end condition)
   991                              <1> 	;
   992                              <1> 	;; restore cursor positions
   993                              <1> 	;mov	esi, cursor_pposn
   994                              <1> 	;mov	edi, CURSOR_POSN
   995                              <1> 	;;mov	ecx, 4	; restore all cursor positions (16 bytes)
   996                              <1> 	;mov	cl, 4
   997                              <1> 	;rep 	movsd
   998                              <1> 	;
   999                              <1> 	;pop	esi
  1000                              <1> 	;
  1001                              <1> 	;; 07/12/2020
  1002                              <1> 	;; restore CRT_START according to ACTIVE_PAGE
  1003                              <1> 	;mov	[CRT_START], cx ; 0
  1004                              <1> 	;
  1005                              <1> 	;; check active page and set it again if it is not 0
  1006                              <1> 	;or	al, al
  1007                              <1> 	;jz	short vbe3_pmi_7
  1008                              <1> 	;
  1009                              <1> 	;mov	cl, al
  1010                              <1> ;vbe3_pmi_5:
  1011                              <1> 	;add	word [CRT_START], 4096
  1012                              <1> 	;dec	cl
  1013                              <1> 	;jnz	short vbe3_pmi_5
  1014                              <1> 
  1015 000019D7 B405                <1> 	mov	ah, 05h ; set current video page
  1016                              <1> 	;al = video page
  1017 000019D9 E82C000000          <1> 	call	int10h_32bit_pmi
  1018                              <1> 	
  1019                              <1> 	; check current cursor position & set it again if not 0,0
  1020                              <1> 	;movzx	ebx, byte [ACTIVE_PAGE]
  1021 000019DE 0FB6D8              <1> 	movzx	ebx, al
  1022 000019E1 D0E3                <1> 	shl	bl, 1
  1023 000019E3 81C3[AE810100]      <1> 	add	ebx, CURSOR_POSN
  1024 000019E9 668B13              <1> 	mov	dx, [ebx]
  1025 000019EC 6621D2              <1> 	and	dx, dx		
  1026 000019EF 7409                <1> 	jz	short vbe3_pmi_7
  1027                              <1> 	
  1028                              <1> 	;dx = cursor position (dl = column, dh = row)
  1029                              <1> 	;mov	bh, [ACTIVE_PAGE] ; 06/12/2020
  1030 000019F1 88C7                <1> 	mov	bh, al
  1031 000019F3 B402                <1> 	mov	ah, 02h ; set cursor position
  1032 000019F5 E810000000          <1> 	call	int10h_32bit_pmi
  1033                              <1> 	
  1034                              <1> 	;jmp	short vbe3_pmi_7
  1035                              <1> 
  1036                              <1> ;vbe3_pmi_6:
  1037                              <1> ;	; 07/12/2020
  1038                              <1> ;	; case 1, previous mode is 03h, current mode is 03h
  1039                              <1> ;	; 03/12/2020
  1040                              <1> ;	cmp	byte [noclearmem], 0
  1041                              <1> ;	jna	short vbe3_pmi_7 ; do not clear memory
  1042                              <1> ;	; clear video page
  1043                              <1> ;	mov	ecx, 1024 ; 4096/4
  1044                              <1> ;	mov	eax, 07200720h
  1045                              <1> ;	mov	edi, 0B8000h ; [crt_base]
  1046                              <1> ;	add	di, [CRT_START]
  1047                              <1> ;	rep	stosd	; FILL THE REGEN BUFFER WITH BLANKS
  1048                              <1> 
  1049                              <1> vbe3_pmi_7:
  1050 000019FA 5F                  <1> 	pop	edi
  1051 000019FB 5A                  <1> 	pop	edx
  1052 000019FC 59                  <1> 	pop	ecx
  1053 000019FD 5B                  <1> 	pop	ebx
  1054                              <1> 	;pop	eax ; 04/12/2020
  1055                              <1> vbe3_pmi_8:
  1056                              <1> 	; 04/12/2020
  1057                              <1> 	;(TRDOS 386 v2.0.3, INT 31h, ah=0 return)
  1058 000019FE 31C0                <1> 	xor	eax, eax  ; eax = 0 -> succesful
  1059                              <1> vesa_vbe3_pmi_retn:
  1060 00001A00 07                  <1> 	pop	es  ; **
  1061 00001A01 1F                  <1> 	pop	ds  ; *
  1062 00001A02 CF                  <1> 	iretd
  1063                              <1> 
  1064                              <1> vbe3_pmi_9:
  1065                              <1> 	; 06/12/2020 
  1066                              <1> 	;cmp	ah, 10h ; Set/Get Palette Registers
  1067                              <1> 	;jnb	short vbe3_pmi_10
  1068                              <1> 	; 05/12/2020
  1069 00001A03 E802000000          <1> 	call	int10h_32bit_pmi
  1070 00001A08 EBF6                <1> 	jmp	short vesa_vbe3_pmi_retn
  1071                              <1> 
  1072                              <1> ;vbe3_pmi_10:
  1073                              <1> 	; 06/12/2020
  1074                              <1> 	;jmp	VGA_funcs_0
  1075                              <1> 
  1076                              <1> int10h_32bit_pmi:
  1077                              <1> 	; 03/12/2020
  1078                              <1> 	; 28/11/2020
  1079                              <1> 	; calling standard VGA Bios (INT 10h) functions
  1080                              <1> 	; by using 32 bit protected mode interface of
  1081                              <1> 	; VESA VBE3 Video Bios (with 'PMID' signature)
  1082                              <1> 
  1083                              <1> 	; 03/12/2020
  1084                              <1> 	; eax, ebx, ecx, edx, edi will be used by vbios pmi
  1085                              <1> 	; (esi and ebp will not be used) 
  1086                              <1> 
  1087                              <1> 	; 03/12/2020
  1088 00001A0A 56                  <1> 	push	esi
  1089 00001A0B C1E010              <1> 	shl	eax, 16  ; move function number (ax) to hw
  1090 00001A0E 8B35[24120300]      <1> 	mov	esi, [pmid_addr] ; linear address of
  1091                              <1> 				 ; PMInfo.Entrypoint pointer
  1092                              <1> 	;mov	ax, [esi+PMInfo.EntryPoint]	
  1093 00001A14 668B06              <1> 	mov	ax, [esi]	 
  1094 00001A17 C1C010              <1> 	rol	eax, 16 ; move PM entry address to hw
  1095                              <1> 			; and move function number to lw (ax)
  1096 00001A1A 5E                  <1> 	pop	esi
  1097                              <1> 
  1098                              <1> 	; top of stack: ; (*)
  1099                              <1> 	; return (the caller) address of "int10h_32bit_pmi"
  1100                              <1> 
  1101 00001A1B E97CEDFFFF          <1> 	jmp	_VBE3PMI_fcall ; will return to the caller (*)
  1102                              <1> 
  1103                              <1> _vbe3_pmfn_srs_8:
  1104                              <1> 	; 17/01/2021
  1105 00001A20 31DB                <1> 	xor 	ebx, ebx ; points to VBE3SAVERESTOREBLOCK
  1106                              <1> _vbe3_pmfn_srs_9: ; 24/01/2021
  1107 00001A22 66B8044F            <1> 	mov	ax, 4F04h
  1108 00001A26 EBE2                <1> 	jmp	short int10h_32bit_pmi
  1109                              <1> 
  1110                              <1> vbe3_pmfn_save_restore_state:
  1111                              <1> 	; 24/01/2021
  1112                              <1> 	; 23/01/2021
  1113                              <1> 	; 16/01/2021, 17/01/2021
  1114                              <1> 	; 14/01/2021
  1115                              <1> 	;
  1116                              <1> 	; VBE function 4F04h - Save/Restore Video State
  1117                              <1> 	;
  1118                              <1> 	; Input:
  1119                              <1> 	;	DL = sub function
  1120                              <1> 	;	CL = requested state
  1121                              <1> 	;      EBX = pointer to buffer (if DL<>00h)
  1122                              <1> 	;	AX = 4F04h 
  1123                              <1> 	; Output:
  1124                              <1> 	;	AX = 004Fh (successful)
  1125                              <1> 	;	AH > 0 -> error
  1126                              <1> 	;	BX = Number of 64-byte blocks 
  1127                              <1> 	;	     to hold the state buffer (if DL=00h)
  1128                              <1> 
  1129                              <1> 	; Modified registers: eax, ebx, esi, edi
  1130                              <1> 	
  1131 00001A28 21DB                <1> 	and	ebx, ebx ; user's buffer address
  1132 00001A2A 750A                <1> 	jnz	short _vbe3_pmfn_save_restore_state
  1133                              <1> 
  1134 00001A2C 08D2                <1> 	or	dl, dl
  1135 00001A2E 740C                <1> 	jz	short _vbe3_pmfn_srs_0
  1136                              <1> 
  1137                              <1> 	; function failed
  1138                              <1> 	;;mov	eax, 0100h
  1139                              <1> 	;sub	eax, eax
  1140                              <1> 	;inc	ah  ; eax = 0100h
  1141                              <1> 	;retn
  1142                              <1> 	; 16/01/2021
  1143                              <1> _vbe3_pmfn_srs_fail:
  1144 00001A30 B84F010000          <1> 	mov	eax, 014Fh ; ah = 1 : Function call failed	
  1145                              <1> 			   ; al = 4Fh : Function is supported
  1146                              <1> _vbe3_srs_retn:
  1147 00001A35 C3                  <1> 	retn
  1148                              <1> 
  1149                              <1> _vbe3_pmfn_save_restore_state:
  1150 00001A36 20D2                <1> 	and	dl, dl
  1151 00001A38 7559                <1> 	jnz	short _vbe3_pmfn_srs_2
  1152                              <1> _vbe3_pmfn_srs:
  1153 00001A3A 31DB                <1> 	xor	ebx, ebx
  1154                              <1> _vbe3_pmfn_srs_0:
  1155                              <1> 	; 24/01/2021
  1156 00001A3C 83F90F              <1> 	cmp	ecx, 0Fh
  1157                              <1> 	;ja	short _vbe3_pmfn_srs_1
  1158 00001A3F 77EF                <1> 	ja	short _vbe3_pmfn_srs_fail 
  1159                              <1> 
  1160                              <1> 	; !!! CLEAR CL BIT 2 !!! 
  1161                              <1> 	; (when bit 2 is set, function causes cpu exception)
  1162                              <1> 	; BIOS data will not be saved and restored
  1163                              <1> 	; (to prevent protected mode page fault error)
  1164 00001A41 80E1FD              <1> 	and	cl, ~2 ; and cl, not 2
  1165                              <1> 	
  1166                              <1> 	; 24/01/2021
  1167                              <1> 	;mov	bl, 1
  1168 00001A44 FEC3                <1> 	inc	bl ; = 1
  1169 00001A46 66D3E3              <1> 	shl	bx, cl 
  1170 00001A49 66231D[28120300]    <1> 	and	bx, [vbe3stbsflags]
  1171 00001A50 7416                <1> 	jz	short _vbe3_pmfn_srs_1
  1172                              <1> 	;mov	bx, cx
  1173 00001A52 89CB                <1> 	mov	ebx, ecx ; <= 15
  1174 00001A54 D0E3                <1> 	shl	bl, 1 ; 0, 2, 8 .. 30
  1175 00001A56 668B9B[713C0000]    <1> 	mov	bx, [vbestatebufsize+ebx]
  1176 00001A5D 89DF                <1> 	mov	edi, ebx
  1177                              <1> 	; edi = state buffer size in bytes
  1178 00001A5F 66C1EB06            <1> 	shr	bx, 6 ; / 64
  1179 00001A63 66B84F00            <1> 	mov	ax, 4Fh
  1180 00001A67 C3                  <1> 	retn
  1181                              <1> _vbe3_pmfn_srs_1:
  1182                              <1> 	; ax = 4F04h
  1183                              <1> 	;call	int10h_32bit_pmi
  1184                              <1> 	; 24/01/2021
  1185                              <1> 	;call	_vbe3_pmfn_srs_8
  1186                              <1> 	; ebx = 0
  1187 00001A68 E8B5FFFFFF          <1> 	call	_vbe3_pmfn_srs_9	
  1188 00001A6D 6683F84F            <1> 	cmp	ax, 004Fh
  1189 00001A71 75C2                <1> 	jne	short _vbe3_srs_retn
  1190                              <1> 	; 24/01/2021
  1191                              <1> 	;cmp	ecx, 0Fh
  1192                              <1> 	;ja	short _vbe3_srs_retn
  1193                              <1> 	; 24/01/2021
  1194                              <1> 	;mov	ax, 1
  1195 00001A73 B001                <1> 	mov	al, 1
  1196 00001A75 66D3E0              <1> 	shl	ax, cl		
  1197 00001A78 660905[28120300]    <1> 	or	[vbe3stbsflags], ax ; set flag for state option
  1198                              <1> 	; 23/01/2021
  1199 00001A7F 89DF                <1> 	mov	edi, ebx
  1200 00001A81 89C8                <1> 	mov	eax, ecx
  1201 00001A83 D0E0                <1> 	shl	al, 1
  1202 00001A85 66C1E706            <1> 	shl	di, 6 ; * 64
  1203 00001A89 6689B8[713C0000]    <1> 	mov	[vbestatebufsize+eax], di
  1204                              <1> 				; save buf size for option 
  1205                              <1> 	;xchg	edi, ebx
  1206                              <1> 	; edi = state buffer size in bytes
  1207 00001A90 B04F                <1> 	mov	al, 4Fh
  1208 00001A92 C3                  <1> 	retn
  1209                              <1> 
  1210                              <1> _vbe3_pmfn_srs_2:
  1211                              <1> 	; 24/01/2021
  1212                              <1> 	; !!! CLEAR CL BIT 2 !!! 
  1213                              <1> 	; (when bit 2 is set, function causes cpu exception)
  1214                              <1> 	; BIOS data will not be saved and restored
  1215                              <1> 	; (to prevent protected mode page fault error)
  1216                              <1> 
  1217 00001A93 F6C1FD              <1> 	test	cl, ~2 ; test cl, not 2
  1218 00001A96 7498                <1> 	jz	short _vbe3_pmfn_srs_fail
  1219                              <1> 
  1220 00001A98 80FA02              <1> 	cmp	dl, 2
  1221 00001A9B 7748                <1> 	ja	short _vbe3_pmfn_srs_5
  1222                              <1> 
  1223                              <1> 	;and	cl, ~2 ; and cl, not 2
  1224                              <1> 
  1225 00001A9D 53                  <1> 	push	ebx ; * ; buffer address
  1226                              <1> 	; save or restore state
  1227                              <1> 	; (get required buffer size at first)
  1228 00001A9E 52                  <1> 	push	edx ; **
  1229 00001A9F 28D2                <1> 	sub	dl, dl ; 0
  1230 00001AA1 E894FFFFFF          <1> 	call	_vbe3_pmfn_srs
  1231 00001AA6 5A                  <1> 	pop	edx ; **
  1232                              <1> 	; 24/01/2021
  1233 00001AA7 5B                  <1> 	pop	ebx ; *
  1234 00001AA8 08E4                <1> 	or	ah, ah
  1235 00001AAA 7538                <1> 	jnz	short _vbe3_pmfn_srs_4 ; error
  1236                              <1> 
  1237                              <1> 	; edi = buffer size in bytes
  1238 00001AAC 81FF00080000        <1> 	cmp	edi, 2048
  1239 00001AB2 772B                <1> 	ja	short _vbe3_pmfn_srs_3
  1240                              <1> 
  1241 00001AB4 80FA01              <1> 	cmp	dl, 1
  1242 00001AB7 7531                <1> 	jne	short _vbe3_pmfn_srs_6 ; restore state
  1243                              <1> 	
  1244                              <1> 	; save video state
  1245                              <1> 	;xor 	ebx, ebx ; points to VBE3SAVERESTOREBLOCK
  1246                              <1> 	;mov	ax, 4F04h
  1247                              <1> 	;call	int10h_32bit_pmi
  1248                              <1> 
  1249                              <1> 	; 24/01/2021
  1250 00001AB9 E842000000          <1> 	call	_vbe3_pmfn_srs_7
  1251                              <1> 	
  1252 00001ABE 6683F84F            <1> 	cmp	ax, 004Fh
  1253 00001AC2 7520                <1> 	jne	short _vbe3_pmfn_srs_4
  1254                              <1> 
  1255 00001AC4 09DB                <1> 	or	ebx, ebx  ; kernel ('sysvideo') ?
  1256 00001AC6 741C                <1> 	jz	short _vbe3_pmfn_srs_4 ; yes
  1257                              <1> 
  1258                              <1> 	; the caller is user
  1259 00001AC8 51                  <1> 	push	ecx ; *
  1260 00001AC9 89F9                <1> 	mov	ecx, edi ; state buffer size
  1261 00001ACB BE00760900          <1> 	mov	esi, VBE3SAVERESTOREBLOCK ; source
  1262                              <1> 					; (vbe3 pmi buff)
  1263 00001AD0 89DF                <1> 	mov	edi, ebx	; destination (user buff)
  1264 00001AD2 E8EDF70000          <1> 	call	transfer_to_user_buffer
  1265 00001AD7 59                  <1> 	pop	ecx ; *
  1266 00001AD8 7205                <1> 	jc	short _vbe3_pmfn_srs_3
  1267                              <1> 
  1268 00001ADA 29C0                <1> 	sub	eax, eax
  1269 00001ADC B04F                <1> 	mov	al, 4Fh
  1270 00001ADE C3                  <1> 	retn
  1271                              <1> 
  1272                              <1> 	; 24/01/2021
  1273                              <1> _vbe3_pmfn_srs_3:
  1274 00001ADF B84F010000          <1> 	mov	eax, 014Fh
  1275                              <1> _vbe3_pmfn_srs_4:
  1276 00001AE4 C3                  <1> 	retn
  1277                              <1> _vbe3_pmfn_srs_5:
  1278 00001AE5 31C0                <1> 	xor	eax, eax
  1279 00001AE7 FEC4                <1> 	inc	ah
  1280                              <1> 	; eax = 0100h, function is not supported
  1281 00001AE9 C3                  <1> 	retn
  1282                              <1> 
  1283                              <1> _vbe3_pmfn_srs_6:
  1284                              <1> 	; restore video state
  1285                              <1> 	; 24/01/2021
  1286                              <1> 	;pop	ebx ; *
  1287                              <1> 	; 23/01/2021
  1288 00001AEA 09DB                <1> 	or	ebx, ebx ; 0 ?	
  1289 00001AEC 7412                <1> 	jz	short _vbe3_pmfn_srs_7 ; 'sysvideo' call
  1290                              <1> 	; 24/01/2021
  1291                              <1> 	;jz	_vbe3_pmfn_srs_8
  1292 00001AEE 89DE                <1> 	mov	esi, ebx
  1293                              <1> 	; esi = user's video state buffer
  1294 00001AF0 51                  <1> 	push	ecx ; *
  1295 00001AF1 89F9                <1> 	mov	ecx, edi ; state buffer size
  1296 00001AF3 BF00760900          <1> 	mov	edi, VBE3SAVERESTOREBLOCK ; destination
  1297                              <1> 					; (vbe3 pmi buff)
  1298                              <1> 	;mov	esi, ebx	; source (user buff)
  1299 00001AF8 E811F80000          <1> 	call	transfer_from_user_buffer
  1300 00001AFD 59                  <1> 	pop	ecx ; *
  1301 00001AFE 72DF                <1> 	jc	short _vbe3_pmfn_srs_3
  1302                              <1> _vbe3_pmfn_srs_7:
  1303 00001B00 53                  <1> 	push	ebx ; *
  1304                              <1> 	; restore video state
  1305                              <1> 	;xor 	ebx, ebx ; points to VBE3SAVERESTOREBLOCK
  1306                              <1> 	;mov	ax, 4F04h
  1307                              <1> 	;call	int10h_32bit_pmi
  1308                              <1> 	; 17/01/2021
  1309 00001B01 E81AFFFFFF          <1> 	call	_vbe3_pmfn_srs_8
  1310 00001B06 5B                  <1> 	pop	ebx ; *
  1311 00001B07 C3                  <1> 	retn
  1312                              <1> 
  1313                              <1> VIDEO_STATE:
  1314                              <1> 	; 26/06/2016
  1315                              <1> 	; 12/05/2016
  1316                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1317                              <1> 
  1318                              <1> ;---------------------------------------------------
  1319                              <1> ; VIDEO STATE
  1320                              <1> ;  RETURNS THE CURRENT VIDEO STATE IN AX
  1321                              <1> ;  AH = NUMBER OF COLUMNS ON THE SCREEN
  1322                              <1> ;  AL = CURRENT VIDEO MODE
  1323                              <1> ;  BH = CURRENT ACTIVE PAGE
  1324                              <1> ;---------------------------------------------------
  1325                              <1> 
  1326 00001B08 8A25[BC6F0000]      <1> 	mov	ah, [CRT_COLS]	; GET NUMBER OF COLUMNS
  1327 00001B0E A0[BA6F0000]        <1> 	mov	al, [CRT_MODE]	; CURRENT MODE
  1328                              <1> 	;movzx	esi, al
  1329                              <1> 	;mov	ah, [esi+M6] 
  1330                              <1> 	; BH = active page
  1331 00001B13 8A3D[BE810100]      <1> 	mov	bh, [ACTIVE_PAGE] ; GET CURRENT ACTIVE PAGE
  1332 00001B19 FA                  <1> 	cli	; 02/01/2017
  1333 00001B1A 5D                  <1> 	pop	ebp		; RECOVER REGISTERS
  1334 00001B1B 5F                  <1> 	pop	edi
  1335 00001B1C 5E                  <1> 	pop	esi
  1336 00001B1D 59                  <1> 	pop	ecx		; DISCARD SAVED BX
  1337 00001B1E EB41                <1> 	jmp	short M15	; RETURN TO CALLER
  1338                              <1> 
  1339                              <1> set_mode_ncm:
  1340                              <1> 	; 17/11/2020 (TRDOS 386 v2.0.3)
  1341                              <1> 	; 04/07/2016 - TRDOS 386 (TRDOS v2.0)
  1342                              <1> 	; set mode without clearing the video memory
  1343                              <1> 	; (ony for graphics modes)
  1344                              <1> 
  1345                              <1> 	;cmp	al, 7 ; IBM PC CGA modes
  1346                              <1> 	;jna	short SET_MODE ; normal function (clear)
  1347                              <1> 	;; do not clear memory
  1348                              <1> 	;;mov	[noclearmem], al ; > 0
  1349                              <1> 	;mov	byte [noclearmem], 80h ; 17/11/2020
  1350                              <1> 	;call	_set_mode
  1351                              <1> 	;mov	byte [noclearmem], 0
  1352                              <1>         ;jmp     short VIDEO_RETURN
  1353                              <1> 
  1354                              <1> 	; 17/11/2020 (TRDOS v2.0.3)
  1355 00001B20 0C80                <1> 	or	al, 80h ; not clear memory option
  1356                              <1> 
  1357                              <1> 	; 05/12/2020
  1358                              <1> 	; 27/11/2020
  1359                              <1> 	; 17/11/2020
  1360                              <1> 	; 08/08/2016, 10/08/2016
  1361                              <1> 	; 29/07/2016, 30/07/2016
  1362                              <1> 	; 25/07/2016, 26/07/2016, 27/07/2016
  1363                              <1> 	; 02/07/2016, 18/07/2016, 23/07/2016
  1364                              <1> 	; 24/06/2016, 26/06/2016
  1365                              <1> 	; 29/05/2016 - TRDOS 386 (TRDOS v2.0)
  1366                              <1> SET_MODE:
  1367                              <1> 	; For 32 bit TRDOS and Retro UNIX 386:
  1368                              <1> 	;	valid video mode: 03h only!
  1369                              <1> 	;	(VGA modes will be selected with another routine)
  1370                              <1> 	;
  1371                              <1> 	; set_txt_mode ; 80*25 (16 fore colors, 8 back colors)
  1372                              <1> 
  1373                              <1> 	; 27/11/2020
  1374                              <1> 	
  1375                              <1> 	; Check if current mode is 
  1376                              <1> 	; Bochs/Plex86 VBE graphics mode
  1377 00001B22 803D[BA6F0000]FF    <1> 	cmp	byte [CRT_MODE], 0FFh ; VESA VBE graphics mode
  1378 00001B29 7220                <1> 	jb	short _set_mode_      ; signature  	
  1379                              <1> 				      ; VBE mode number is in	 
  1380                              <1> 				      ; [video_mode] bit 0to8
  1381 00001B2B 88C3                <1> 	mov	bl, al ; save video mode
  1382 00001B2D E893240000          <1> 	call	dispi_get_enable
  1383 00001B32 50                  <1> 	push	eax ; save current VBE dispi status 
  1384                              <1> 	; Disable Bochs/Plex86 VBE dispi
  1385                              <1> 	;mov	ax, 0 ; VBE_DISPI_DISABLED 
  1386 00001B33 31C0                <1> 	xor	eax, eax ; 0 
  1387 00001B35 E85F240000          <1> 	call	dispi_set_enable
  1388 00001B3A 88D8                <1> 	mov	al, bl ; restore video mode
  1389 00001B3C E827000000          <1> 	call	_set_mode
  1390 00001B41 58                  <1> 	pop	eax ; restore current VBE dispi status 
  1391 00001B42 7313                <1> 	jnc	short VIDEO_RETURN
  1392                              <1> 	; ! unimplemented or invalid video mode number !
  1393                              <1> 	; VBE dispi must be enabled again
  1394                              <1> 	; (return to run on current VBE graphics mode)
  1395                              <1> 	;;mov	al, [video_mode+1] ; bit 8 to 15
  1396                              <1> 	;;and	al, 0C0h ; isolate bit 14 and bit 15 
  1397                              <1> 	;;or	al, 1 ; VBE_DISPI_ENABLED
  1398 00001B44 E850240000          <1> 	call	dispi_set_enable
  1399 00001B49 EB07                <1> 	jmp	short _video_func_err
  1400                              <1> 
  1401                              <1> _set_mode_:
  1402                              <1> 	; VGA bios (non-VBE) 'setmode' procedure
  1403                              <1> 
  1404                              <1> 	; 26/11/2020 (TRDOS v2.0.3)
  1405                              <1> 	
  1406                              <1> ;------------------------------------------------------
  1407                              <1> ; SET MODE					      :
  1408                              <1> ;	THIS ROUTINE INITIALIZES THE ATTACHMENT TO    :
  1409                              <1> ;	THE SELECTED MODE, THE SCREEN IS BLANKED.     :
  1410                              <1> ; INPUT						      :
  1411                              <1> ;	(AL) - MODE SELECTED (RANGE 0-7)	      :
  1412                              <1> ; OUTPUT					      :
  1413                              <1> ;	NONE					      :
  1414                              <1> ;------------------------------------------------------
  1415                              <1> 
  1416 00001B4B E818000000          <1> 	call	_set_mode ; 24/06/2016 (set_txt_mode)
  1417                              <1> 	; 26/11/2020
  1418 00001B50 7305                <1> 	jnc	short VIDEO_RETURN
  1419                              <1> 
  1420                              <1> 	; 26/11/2020
  1421                              <1> _video_func_err:
  1422 00001B52 31C0                <1> 	xor	eax, eax ; function call failed
  1423 00001B54 48                  <1> 	dec	eax  ; 0FFFFFFFFh ; - 1	
  1424 00001B55 EB05                <1> 	jmp	short _video_return	
  1425                              <1> 
  1426                              <1> ; 12/05/2016
  1427                              <1> ; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1428                              <1> 
  1429                              <1> ;-----	NORMAL RETURN FROM ALL VIDEO RETURNS
  1430                              <1> 
  1431                              <1> VIDEO_RETURN:
  1432 00001B57 A1[188E0100]        <1> 	mov	eax, [video_eax] ; 12/05/2016
  1433                              <1> _video_return:
  1434 00001B5C FA                  <1> 	cli ; 02/01/2017
  1435 00001B5D 5D                  <1> 	pop	ebp ; ******** ; 26/11/2020
  1436 00001B5E 5F                  <1> 	pop	edi ; *******
  1437 00001B5F 5E                  <1> 	pop	esi ; ******
  1438 00001B60 5B                  <1> 	pop	ebx ; *****
  1439                              <1> M15:	; VIDEO_RETURN_C
  1440                              <1> 	;;15/01/2017
  1441                              <1> 	; 02/01/2017
  1442                              <1> 	;;mov	byte [intflg], 0
  1443                              <1> 	;
  1444 00001B61 59                  <1> 	pop	ecx ; **** ; 26/11/2020
  1445 00001B62 5A                  <1> 	pop	edx ; ***
  1446 00001B63 1F                  <1> 	pop	ds  ; **
  1447 00001B64 07                  <1> 	pop	es  ; *	; RECOVER SEGMENTS
  1448 00001B65 CF                  <1> 	iretd		; ALL DONE
  1449                              <1> 
  1450                              <1> set_txt_mode:
  1451                              <1> 	
  1452                              <1> 	; 29/07/2016
  1453                              <1> 	; 27/06/2016
  1454 00001B66 B003                <1> 	mov	al, 3 ; 26/11/2020 (bit 7 = 0)
  1455                              <1> 
  1456                              <1> 	; 17/11/2020 (TRDOS v2.0.3)
  1457                              <1> 	;mov	byte [noclearmem], 0
  1458                              <1> 
  1459                              <1> ; 10/08/2016
  1460                              <1> ; 08/08/2016
  1461                              <1> ; 30/07/2016
  1462                              <1> ; 29/07/2016
  1463                              <1> ; 25/07/2016, 26/07/2016, 27/07/2016
  1464                              <1> ; 07/07/2016, 18/07/2016, 23/07/2016
  1465                              <1> ; 02/07/2016, 03/07/2016, 04/07/2016
  1466                              <1> ; 26/06/2016
  1467                              <1> ; 24/06/2016 (set_txt_mode -> _set_mode)
  1468                              <1> ; 17/06/2016
  1469                              <1> ; 29/05/2016
  1470                              <1> ; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1471                              <1> 
  1472                              <1> _set_mode:
  1473                              <1> 	; 12/12/2020
  1474                              <1> 	; 26/11/2020
  1475                              <1> 	; call from 'biosfn_set_video_mode'
  1476                              <1> 	;	(bochs/plex86 video bios code)
  1477                              <1> 	; call from 'SET_MODE'
  1478                              <1> 	;	(TRDOS 386 v2 default, IBM PC/AT rom bios code)
  1479                              <1> 	; continue from 'set_txt_mode'	
  1480                              <1> 
  1481                              <1> 	; INPUT:
  1482                              <1> 	;	al = VGA video mode
  1483                              <1> 	; RETURN:
  1484                              <1> 	;	cf = 1 -> video mode not implemented
  1485                              <1> 	;	cf = 0 -> OK
  1486                              <1> 	;
  1487                              <1> 	; Modified registers: eax, bx, ecx, esi, edi, (ebp)
  1488                              <1> 
  1489                              <1> 	; 17/11/2020 (TRDOS v2.0.3)
  1490                              <1> 	; no clear memory option 
  1491                              <1> 	; (from mode number byte bit 7)
  1492 00001B68 88C4                <1> 	mov	ah, al
  1493 00001B6A 80E480              <1> 	and	ah, 80h
  1494                              <1> 	;mov	[noclearmem], al
  1495 00001B6D 8825[278E0100]      <1> 	mov	[noclearmem], ah
  1496                              <1> 	;and	al, 7Fh ; clear bit 7
  1497                              <1> 	;;xor	[noclearmem], al ; clear bit 0 to 6
  1498                              <1> 	; 26/11/2020
  1499 00001B73 30E0                <1> 	xor	al, ah ; and al, 7Fh
  1500                              <1> 
  1501                              <1> 	; 19/11/2020
  1502                              <1> 
  1503                              <1> 	; Video mode 03h action principle:
  1504                              <1> 	;
  1505                              <1> 	; for case 1:
  1506                              <1> 	; Current mode is 03h and next/requested mode is not 03h
  1507                              <1> 	;	- save mode (set mode 03h flag)
  1508                              <1> 	;	- save 8 video pages (which are will be restored)	
  1509                              <1> 	;	- save active page number (which will be reactivated)
  1510                              <1> 	;	- set active page to 0 always (no multi screen)
  1511                              <1> 	;	- save 8 cursor positions (which will be restored)
  1512                              <1> 	; 	- use 'noclearmem' option
  1513                              <1> 	;	[p_crt_mode] = 0 -> 03h 
  1514                              <1> 	;
  1515                              <1> 	; for case 2:
  1516                              <1> 	; Current mode is 03h and next/requested mode is also 03h
  1517                              <1> 	;	- clear active video page if 'noclearmem' is not set
  1518                              <1> 	;	[p_crt_mode] = 0 -> 80h -> 0
  1519                              <1> 	;
  1520                              <1> 	; for case 3:
  1521                              <1> 	; Current mode is not 03h and next/requested mode is 03h
  1522                              <1> 	;	- restore video pages (8 video pages were saved)	
  1523                              <1> 	;	- restore active page number (which were saved)
  1524                              <1> 	;	- restore 8 cursor positions (which were saved)
  1525                              <1> 	;	- reset/clear mode 03h flag
  1526                              <1> 	;	[p_crt_mode] = 03h -> 0
  1527                              <1> 	;
  1528                              <1> 	; for case 4:
  1529                              <1> 	; Current mode is not 03h and next/requested mode is not 03h
  1530                              <1> 	; 	- use 'noclearmem' option
  1531                              <1> 	;	- set active page to 0 always
  1532                              <1> 	;	[p_crt_mode] = 03h -> 83h -> 03h
  1533                              <1> 	;
  1534                              <1> 	; initial (boot time) values:
  1535                              <1> 	;	[p_crt_mode] = 0 ("there isn't a page backup, yet")
  1536                              <1> 	;	  [CRT_MODE] = 3 (kernel's starting mode)
  1537                              <1> 
  1538                              <1> 	; 26/11/2020
  1539 00001B75 3C03                <1> 	cmp	al, 03h	    ; mode 3, 80x25 text, 16 colors
  1540 00001B77 7515                <1> 	jne	short _sm_0 ; (default mode for TRDOS 386 mainprog) 	
  1541                              <1> 
  1542                              <1> 	; case 2 or case 3
  1543                              <1> 
  1544                              <1> 	; check current video mode if it is 03h
  1545 00001B79 08E4                <1> 	or	ah, ah ; 80h or 0 ('noclearmem' option)
  1546 00001B7B 7521                <1> 	jnz	short _sm_1 ; do not clear display page
  1547                              <1>  	
  1548                              <1> 	; 26/11/2020
  1549                              <1> 	; Note:
  1550                              <1> 	; [CRT_MODE] = 0FFh for VESA VBE video modes
  1551                              <1> 	; [video_mode] = standard VGA and VESA VBE video modes
  1552                              <1> 	
  1553 00001B7D 3805[BA6F0000]      <1> 	cmp	[CRT_MODE], al	; 03h
  1554 00001B83 7520                <1> 	jne	short _sm_2	; case 3 ([p_crt_mode] = 03h)
  1555                              <1> 
  1556                              <1> 	; case 2
  1557                              <1> 
  1558                              <1> 	; [p_crt_mode] = 0
  1559                              <1> 
  1560                              <1> 	; 19/11/2020
  1561                              <1> 	; If '_set_mode' procedure is called for video mode 3
  1562                              <1> 	;     while video mode is 3, video page will be cleared
  1563                              <1> 	;     and cursor position of video page will be reset.	 
  1564                              <1> 
  1565                              <1> 	; clear display page
  1566 00001B85 C605[258E0100]80    <1> 	mov	byte [p_crt_mode], 80h ; clear page sign
  1567 00001B8C EB1C                <1> 	jmp	short _sm_3	; bypass save video page routine
  1568                              <1> _sm_0:
  1569                              <1> 	; case 1 or case 4
  1570                              <1> 
  1571                              <1> 	; 05/12/2020
  1572 00001B8E 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 3 ; is current mode 03h?
  1573 00001B95 7507                <1> 	jne	short _sm_1	; case 4 ; [p_crt_mode] = 03h
  1574                              <1> 	
  1575                              <1> 	; case 1
  1576                              <1> 	; [p_crt_mode] = 0
  1577                              <1> 
  1578                              <1> 	; 19/11/2020
  1579                              <1> 	; If '_set_mode' procedure is called for a video mode
  1580                              <1> 	;     except video mode 3 while current video mode
  1581                              <1> 	;     is 3, all video pages of mode 3 will be copied 
  1582                              <1> 	;     to 98000h address as backup, before mode change.	
  1583                              <1> 	
  1584                              <1> _sm_save_pm:
  1585                              <1> 	; 12/12/2020
  1586                              <1> 	;; 03/07/2016
  1587                              <1> 	;; save video pages
  1588                              <1> 	;mov	esi, 0B8000h
  1589                              <1> 	;mov	edi, 98000h ; 30/07/2016
  1590                              <1> 	;mov	ecx, (0B8000h-0B0000h)/4
  1591                              <1> 	;rep	movsd
  1592                              <1> 
  1593                              <1> 	;mov	byte [p_crt_mode], 3 ; previous mode, backup sign
  1594                              <1> 	;; 26/11/2020
  1595                              <1> 	;xchg	cl, [ACTIVE_PAGE]
  1596                              <1> 	;mov	[p_crt_page], cl  ; save as previous active page	
  1597                              <1> 	;
  1598                              <1> 	;; save cursor positions
  1599                              <1> 	;mov	esi, CURSOR_POSN
  1600                              <1> 	;mov	edi, cursor_pposn ; cursor positions backup
  1601                              <1> 	;mov	cl, 4
  1602                              <1> 	;rep	movsd
  1603                              <1> 
  1604                              <1> 	; 12/12/2020
  1605 00001B97 E881020000          <1> 	call	save_mode3_multiscreen
  1606                              <1> 
  1607                              <1> 	; 29/07/2016
  1608                              <1> 	;;mov	[ACTIVE_PAGE], cl ; 0
  1609                              <1> 	;xchg	cl, [ACTIVE_PAGE]
  1610                              <1> 	;mov	[p_crt_page], cl  ; previous page (for mode 3)	
  1611                              <1> 	
  1612                              <1> 	; [ACTIVE_PAGE] = 0 
  1613                              <1> 	
  1614 00001B9C EB07                <1> 	jmp	short _sm_2	; case 1 - 19/11/2020
  1615                              <1> _sm_1:
  1616                              <1> 	; 26/11/2020
  1617                              <1> 	; 19/11/2020
  1618                              <1> 	
  1619                              <1> 	; case 4
  1620 00001B9E 800D[258E0100]80    <1> 	or	byte [p_crt_mode], 80h 
  1621                              <1> 				; here [p_crt_mode] must be 83h
  1622                              <1> 				;	  (for case 4)
  1623                              <1> 				; (because video mode 03h
  1624                              <1> 				; was changed before as in case 1) 
  1625                              <1> 
  1626                              <1> _sm_2:	; case 4 (jump to _sm_2) - 19/11/2020 
  1627                              <1> 
  1628                              <1> 	; 19/11/2020
  1629                              <1> 	; case 3
  1630                              <1> 	; If '_set_mode' procedure is called for video mode 3
  1631                              <1> 	;     while video mode is not 3 and if there is video
  1632                              <1> 	;     page backup for video mode 3, all (of 8) mode 3
  1633                              <1> 	;     video pages will be restored from 98000h.
  1634                              <1> 
  1635 00001BA5 A2[BA6F0000]        <1> 	mov	[CRT_MODE], al  ; save mode in global variable
  1636                              <1> _sm_3:
  1637                              <1> 	; 30/07/2016
  1638                              <1> 	; 26/07/2016
  1639                              <1> 	; 25/07/2016
  1640                              <1> 	; set_mode_vga:
  1641                              <1> 	; 18/07/2016
  1642                              <1> 	; 14/07/2016
  1643                              <1> 	; 09/07/2016
  1644                              <1> 	; 04/07/2016
  1645                              <1> 	; 03/07/2016 (TRDOS 386 = TRDOS v2.0)
  1646                              <1> 	; /// video mode 13h ///
  1647                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  1648                              <1> 	; vgabios-0.7a (2011)
  1649                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  1650                              <1> 	; 'vgabios.c', 'vgatables.h'
  1651                              <1> 	;
  1652                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
  1653                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
  1654                              <1> 	;
  1655 00001BAA 88C4                <1> 	mov	ah, al
  1656 00001BAC B910000000          <1> 	mov	ecx, vga_mode_count 	
  1657 00001BB1 BE[D66F0000]        <1> 	mov	esi, vga_modes
  1658 00001BB6 31DB                <1> 	xor	ebx, ebx
  1659                              <1> _sm_4:
  1660 00001BB8 AC                  <1> 	lodsb
  1661 00001BB9 38C4                <1> 	cmp	ah, al
  1662 00001BBB 7406                <1> 	je	short _sm_5
  1663 00001BBD FEC3                <1> 	inc	bl
  1664 00001BBF E2F7                <1> 	loop	_sm_4
  1665                              <1> 
  1666                              <1> 	; UNIMPLEMENTED VIDEO MODE !
  1667                              <1> 	;xor	eax, eax
  1668                              <1>         ;mov	[video_eax], eax ; 0 
  1669                              <1> 
  1670                              <1> 	; 26/11/2020
  1671 00001BC1 F9                  <1> 	stc	; unimplemented video mode ! (cf=1)	
  1672                              <1> 
  1673 00001BC2 C3                  <1> 	retn
  1674                              <1> 
  1675                              <1> ;-----	eBX POINTS TO CORRECT ROW OF INITIALIZATION TABLE	
  1676                              <1> 
  1677                              <1> _sm_5: 	; 25/07/2016
  1678                              <1> 	;mov	esi, ebx
  1679                              <1> 	;add	esi, vga_memmodel
  1680                              <1> 	;mov	al, [esi]
  1681                              <1> 	; 19/11/2020
  1682 00001BC3 8A83[26700000]      <1> 	mov	al, [ebx+vga_memmodel]
  1683 00001BC9 A2[3E8E0100]        <1> 	mov	[VGA_MTYPE], al
  1684                              <1> 
  1685 00001BCE 89DF                <1> 	mov	edi, ebx
  1686 00001BD0 81C7[36700000]      <1> 	add	edi, vga_dac_s 	
  1687 00001BD6 C0E302              <1> 	shl	bl, 2 ; byte -> dword
  1688 00001BD9 81C3[E66F0000]      <1> 	add	ebx, vga_mode_tbl_ptr
  1689                              <1> 
  1690                              <1> 	;mov	dword [VGA_BASE], 0B8000h
  1691                              <1> 	;cmp	ah, 0Dh ; [CRT_MODE]
  1692                              <1> 	;jb	short M9 
  1693                              <1> 	;mov	dword [VGA_BASE], 0A0000h
  1694                              <1> ;M9:
  1695 00001BDF 8B33                <1> 	mov	esi, [ebx]
  1696 00001BE1 89F3                <1> 	mov	ebx, esi
  1697 00001BE3 83C614              <1> 	add	esi, vga_p_cm_pos ; ebx + 20
  1698 00001BE6 668B06              <1> 	mov	ax, [esi]       ; get the cursor mode from the table
  1699 00001BE9 66A3[D36F0000]      <1> 	mov	[CURSOR_MODE], ax ; save cursor mode (initial value)
  1700                              <1> 	; al = 6, ah = 7
  1701                              <1> 	; al = 0Dh, ah = 0Eh ; 25/07/2016
  1702 00001BEF E8A8020000          <1> 	call	cursor_shape_fix
  1703                              <1> 	; al = 14, ah = 15 (If [CHAR_HEIGHT] = 16)
  1704 00001BF4 668906              <1> 	mov	[esi], ax
  1705                              <1> 
  1706 00001BF7 56                  <1> 	push	esi ; *	
  1707                              <1> 
  1708 00001BF8 8A25[C16F0000]      <1> 	mov	ah, [VGA_MODESET_CTL]
  1709 00001BFE 80E408              <1> 	and	ah, 8 ; default palette loading ?
  1710 00001C01 7524                <1> 	jnz	short _sm_6
  1711 00001C03 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK (DAC mask register)
  1712 00001C07 B0FF                <1> 	mov	al, 0FFh ; PEL mask
  1713 00001C09 EE                  <1> 	out	dx, al
  1714 00001C0A 8A27                <1> 	mov	ah, [edi] ; DAC model (selection number)
  1715 00001C0C E874100000          <1> 	call	load_dac_palette
  1716                              <1> 	; ecx = 0
  1717 00001C11 F605[C16F0000]02    <1> 	test	byte [VGA_MODESET_CTL], 2 ; gray scale summing
  1718 00001C18 740D                <1> 	jz	short _sm_6
  1719 00001C1A 53                  <1> 	push	ebx
  1720 00001C1B 29DB                <1> 	sub	ebx, ebx ; sub bl, bl
  1721 00001C1D 66B90001            <1>         mov     cx, 256 
  1722 00001C21 E8B2100000          <1> 	call	gray_scale_summing
  1723 00001C26 5B                  <1> 	pop	ebx	
  1724                              <1> _sm_6:
  1725                              <1> 	; Reset Attribute Ctl flip-flop
  1726 00001C27 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  1727 00001C2B EC                  <1>  	in	al, dx
  1728                              <1> 	; Set Attribute Ctl
  1729 00001C2C 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
  1730 00001C2E 83C623              <1> 	add	esi, 35  ; actl regs
  1731 00001C31 30E4                <1> 	xor	ah, ah ; 0
  1732 00001C33 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  1733                              <1> _sm_7:
  1734 00001C37 88E0                <1> 	mov	al, ah
  1735 00001C39 EE                  <1> 	out	dx, al ; index
  1736 00001C3A AC                  <1> 	lodsb
  1737                              <1> 	; DX = 3C0h = VGAREG_ACTL_WRITE_DATA
  1738 00001C3B EE                  <1> 	out	dx, al ; value
  1739 00001C3C FEC4                <1> 	inc	ah
  1740 00001C3E 80FC14              <1> 	cmp	ah, 20 ; number of actl registers
  1741 00001C41 72F4                <1> 	jb	short _sm_7
  1742                              <1> 	;
  1743 00001C43 88E0                <1> 	mov	al, ah ; 20
  1744 00001C45 EE                  <1> 	out	dx, al ; index
  1745 00001C46 28C0                <1> 	sub	al, al ; 0
  1746 00001C48 EE                  <1> 	out	dx, al ; value
  1747                              <1> 	;
  1748                              <1> 	; Set Sequencer Ctl
  1749 00001C49 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
  1750 00001C4B 83C605              <1> 	add	esi, 5 ; sequ regs
  1751                              <1> 	;
  1752 00001C4E 66BAC403            <1> 	mov	dx, 3C4h  ; VGAREG_SEQU_ADDRESS
  1753 00001C52 EE                  <1> 	out	dx, al ; 0
  1754 00001C53 6642                <1> 	inc	dx ; 3C5h ; VGAREG_SEQU_DATA
  1755 00001C55 B003                <1> 	mov	al, 3
  1756 00001C57 EE                  <1> 	out	dx, al
  1757 00001C58 B401                <1> 	mov	ah, 1	
  1758                              <1> _sm_8:
  1759 00001C5A 88E0                <1> 	mov	al, ah
  1760                              <1> 	;mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  1761 00001C5C 664A                <1> 	dec	dx
  1762 00001C5E EE                  <1> 	out	dx, al ; index
  1763 00001C5F AC                  <1> 	lodsb
  1764 00001C60 6642                <1> 	inc	dx ; 3C5h ; VGAREG_SEQU_DATA
  1765 00001C62 EE                  <1> 	out	dx, al
  1766 00001C63 80FC04              <1> 	cmp	ah, 4 ; number of sequ regs
  1767 00001C66 7304                <1> 	jnb	short _sm_9		
  1768 00001C68 FEC4                <1> 	inc	ah 
  1769 00001C6A EBEE                <1> 	jmp	short _sm_8
  1770                              <1> _sm_9:
  1771                              <1> 	; Set Grafx Ctl
  1772 00001C6C 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
  1773 00001C6E 83C637              <1> 	add	esi, 55 ; grdc regs
  1774 00001C71 30E4                <1> 	xor	ah, ah ; 0
  1775                              <1> _sm_10:
  1776 00001C73 88E0                <1> 	mov	al, ah
  1777 00001C75 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  1778 00001C79 EE                  <1> 	out	dx, al	
  1779 00001C7A AC                  <1> 	lodsb
  1780 00001C7B 6642                <1> 	inc	dx ; 3CFh ; VGAREG_GRDC_DATA
  1781 00001C7D EE                  <1> 	out	dx, al
  1782 00001C7E FEC4                <1> 	inc	ah
  1783 00001C80 80FC09              <1> 	cmp	ah, 9 ; number of grdc regs
  1784 00001C83 72EE                <1> 	jb	short _sm_10
  1785                              <1> 	;
  1786                              <1> 	; Disable CRTC write protection
  1787 00001C85 66BAD403            <1> 	mov	dx, 3D4h  ; VGAREG_VGA_CRTC_ADDRESS
  1788                              <1> 	;mov	al, 11h
  1789                              <1> 	;our	dx, al
  1790                              <1> 	;inc	dx
  1791                              <1> 	;sub	al, al
  1792                              <1> 	;out	dx, al
  1793 00001C89 66B81100            <1> 	mov	ax, 11h
  1794 00001C8D 66EF                <1> 	out	dx, ax
  1795 00001C8F 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
  1796 00001C91 83C60A              <1> 	add	esi, 10 ; crtc regs
  1797                              <1> 	; ah = 0
  1798                              <1> _sm_11:
  1799 00001C94 88E0                <1> 	mov	al, ah
  1800                              <1> 	; dx = 3D4h = VGAREG_VGA_CRTC_ADDRESS
  1801 00001C96 EE                  <1> 	out	dx, al ; index
  1802 00001C97 AC                  <1> 	lodsb
  1803 00001C98 6642                <1> 	inc	dx  ; VGAREG_VGA_CRTC_ADDRESS + 1
  1804 00001C9A EE                  <1> 	out	dx, al ; value
  1805 00001C9B 80FC18              <1> 	cmp	ah, 24 ; number of crtc registers - 1
  1806 00001C9E 7306                <1> 	jnb	short _sm_12
  1807 00001CA0 FEC4                <1> 	inc	ah
  1808 00001CA2 664A                <1> 	dec	dx ; 3D4h
  1809 00001CA4 EBEE                <1> 	jmp	short _sm_11
  1810                              <1> _sm_12:
  1811                              <1> 	; Set the misc register
  1812 00001CA6 66BACC03            <1> 	mov	dx, 3CCh ; VGAREG_READ_MISC_OUTPUT
  1813 00001CAA 8A4309              <1> 	mov	al, [ebx+9] ; misc reg
  1814 00001CAD EE                  <1> 	out	dx, al
  1815                              <1> 	;
  1816                              <1> 	; Enable video
  1817 00001CAE 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  1818 00001CB2 B020                <1> 	mov	al, 20h  
  1819 00001CB4 EE                  <1>         out     dx, al   ; set bit 5 to 1
  1820 00001CB5 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  1821 00001CB9 EC                  <1> 	in	al, dx
  1822                              <1> 	;
  1823                              <1> 	; 17/11/2020
  1824                              <1> 	;cmp	byte [noclearmem], 0
  1825                              <1>         ;ja	short _sm_15
  1826                              <1> 
  1827 00001CBA F605[278E0100]80    <1> 	test	byte [noclearmem], 80h
  1828 00001CC1 7540                <1> 	jnz	short _sm_15	
  1829                              <1> 
  1830                              <1> 	; 29/07/2016
  1831 00001CC3 31C0                <1> 	xor	eax, eax
  1832 00001CC5 B900400000          <1> 	mov	ecx, 4000h ; 16K words (32K)
  1833 00001CCA 803D[3E8E0100]02    <1> 	cmp     byte [VGA_MTYPE], 2  ; CTEXT, MTEXT, CGA
  1834 00001CD1 7715                <1> 	ja	short _sm_14    ; no ? (0A0000h)
  1835 00001CD3 BF00800B00          <1> 	mov	edi, 0B8000h
  1836 00001CD8 7409                <1> 	je	short _sm_13	; CGA graphics mode
  1837                              <1> 	; 08/08/2016
  1838 00001CDA A3[3A8E0100]        <1> 	mov	[VGA_INT43H], eax ; 0 ; default font 
  1839 00001CDF 66B82007            <1> 	mov	ax, 0720h	; CGA text mode
  1840                              <1> _sm_13:
  1841 00001CE3 F366AB              <1> 	rep	stosw
  1842 00001CE6 EB1B                <1> 	jmp	short _sm_15		
  1843                              <1> 
  1844                              <1> _sm_14:
  1845 00001CE8 BF00000A00          <1> 	mov	edi, 0A0000h
  1846                              <1> 	; ecx = 16384 dwords (64K)
  1847 00001CED 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  1848 00001CF1 B002                <1> 	mov	al, 2
  1849 00001CF3 EE                  <1> 	out	dx, al
  1850                              <1> 	;mov	dx, 3C5h ; VGAREG_SEQU_DATA
  1851 00001CF4 6642                <1> 	inc	dx
  1852 00001CF6 EC                  <1> 	in	al, dx ; mmask
  1853 00001CF7 6650                <1> 	push	ax
  1854 00001CF9 B00F                <1> 	mov	al, 0Fh ; all planes
  1855 00001CFB EE                  <1> 	out	dx, al
  1856 00001CFC 30C0                <1> 	xor	al, al ; 0
  1857 00001CFE F3AB                <1> 	rep	stosd	; ecx = 163684 (64K)
  1858 00001D00 6658                <1> 	pop	ax
  1859 00001D02 EE                  <1> 	out	dx, al  ; mmask
  1860                              <1> _sm_15:
  1861                              <1> 	; ebx = addr of params tbl for selected mode
  1862                              <1> 	; 10/08/2016
  1863 00001D03 668B03              <1> 	mov	ax, [ebx] ; num of columns, 'twidth'
  1864 00001D06 A2[BC6F0000]        <1> 	mov	[CRT_COLS], al
  1865                              <1> 	;; 26/07/2016
  1866                              <1> 	;; CRTC_ADDRESS = 3D4h (always)
  1867                              <1> 	;mov	ah, [ebx+1] ; num of rows, 'theightm1'
  1868 00001D0B FEC4                <1> 	inc	ah ; 09/07/2016
  1869 00001D0D 8825[C26F0000]      <1> 	mov	[VGA_ROWS], ah
  1870                              <1> 	; 10/08/2016
  1871 00001D13 8A4302              <1> 	mov	al, [ebx+2]
  1872 00001D16 A2[BE6F0000]        <1> 	mov	[CHAR_HEIGHT], al 
  1873                              <1> 	; 29/07/2016
  1874                              <1> 	; length of regen buffer in bytes
  1875 00001D1B 668B4B03            <1> 	mov	cx, [ebx+3] ; 'slength_l'
  1876 00001D1F 66890D[288E0100]    <1> 	mov	[CRT_LEN], cx
  1877                              <1> 	;
  1878                              <1> 	; 27/07/2016
  1879 00001D26 30E4                <1> 	xor	ah, ah
  1880 00001D28 A0[BE810100]        <1> 	mov	al, [ACTIVE_PAGE] ; may be > 0 for mode 3
  1881                              <1> 	;mul	word [CRT_LEN] ; 4096 for mode 3
  1882 00001D2D 66F7E1              <1> 	mul	cx ; 29/07/2016
  1883 00001D30 66A3[AC810100]      <1> 	mov	[CRT_START], ax
  1884                              <1> 	;
  1885 00001D36 B060                <1> 	mov	al, 60h
  1886                              <1> 	;cmp	byte [noclearmem], 0
  1887                              <1> 	;jna	short _sm_16
  1888                              <1> 	;add	al, 80h
  1889 00001D38 0A05[278E0100]      <1> 	or	al, [noclearmem] ; 17/11/2020
  1890                              <1> _sm_16:
  1891 00001D3E A2[BF6F0000]        <1> 	mov	[VGA_VIDEO_CTL], al
  1892 00001D43 C605[C06F0000]F9    <1> 	mov	byte [VGA_SWITCHES], 0F9h
  1893 00001D4A 8025[C16F0000]7F    <1> 	and	byte [VGA_MODESET_CTL], 7Fh
  1894                              <1> 
  1895 00001D51 5E                  <1> 	pop	esi ; *
  1896                              <1> 
  1897                              <1> 	; 26/07/2016
  1898                              <1> 	; 07/07/2016
  1899 00001D52 668B0D[D36F0000]    <1> 	mov	cx, [CURSOR_MODE] ; restore cursor mode (initial value)
  1900 00001D59 66870E              <1> 	xchg	cx, [esi] ; cl = start line, ch = end line
  1901                              <1> 			  ; reset to initial value
  1902 00001D5C 86E9                <1> 	xchg 	ch, cl  ; ch = start line, cl = end line  
  1903 00001D5E 66890D[D36F0000]    <1> 	mov	[CURSOR_MODE], cx ; save (fixed) cursor mode
  1904                              <1> 
  1905                              <1> 	; 27/07/2016
  1906 00001D65 803D[3E8E0100]02    <1> 	cmp	byte [VGA_MTYPE], 2 ; CTEXT, MTEXT
  1907 00001D6C 7317                <1> 	jnb	short _sm_17
  1908                              <1> 
  1909                              <1> 	; Set cursor shape
  1910                              <1> 	;mov	cx, 0607h
  1911                              <1> 	;call	_set_ctype
  1912                              <1> 
  1913                              <1> 	; 29/07/2016
  1914 00001D6E B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
  1915 00001D70 E84D060000          <1> 	call	m16	; output cx register
  1916                              <1> 	
  1917                              <1> 	; 25/07/2016
  1918 00001D75 803D[BA6F0000]03    <1>         cmp     byte [CRT_MODE], 03h
  1919 00001D7C 7507                <1> 	jne	short _sm_17
  1920                              <1> 	; 26/07/2016
  1921                              <1> 
  1922 00001D7E A0[BE810100]        <1> 	mov	al, [ACTIVE_PAGE]
  1923 00001D83 EB0B                <1> 	jmp	short _sm_18
  1924                              <1> _sm_17:
  1925                              <1> 	; Set cursor pos for page 0..7
  1926                              <1> 	;sub	ax, ax ; eax = 0
  1927 00001D85 29C0                <1> 	sub	eax, eax ; 17/11/2020
  1928 00001D87 BF[AE810100]        <1> 	mov	edi, CURSOR_POSN
  1929 00001D8C AB                  <1> 	stosd	
  1930 00001D8D AB                  <1> 	stosd
  1931 00001D8E AB                  <1> 	stosd
  1932 00001D8F AB                  <1> 	stosd
  1933                              <1> 	;; Set active page 0
  1934                              <1> 	;mov	[ACTIVE_PAGE], al ; 0
  1935                              <1> _sm_18:
  1936                              <1> 	; 29/07/2016
  1937 00001D90 803D[3E8E0100]02    <1> 	cmp	byte [VGA_MTYPE], 2 ; CTEXT, MTEXT
  1938 00001D97 737F                <1>         jnb	_sm_23
  1939                              <1> 
  1940                              <1> 	;cmp	byte [CHAR_HEIGHT], 16
  1941                              <1> 	;je	short _sm_19
  1942                              <1> 
  1943                              <1>  	;; copy and activate 8x16 font
  1944                              <1> 	
  1945                              <1> 	; 26/07/2016
  1946 00001D99 B004                <1> 	mov	al, 04h
  1947                              <1> 	;sub	bl, bl
  1948                              <1> 	; AX = 1104H ; Load ROM 8x16 Character Set
  1949                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
  1950 00001D9B E8DE160000          <1> 	call	load_text_8_16_pat
  1951                              <1> 
  1952                              <1> 	; video_func_1103h:
  1953                              <1> 	; biosfn_set_text_block_specifier:
  1954                              <1> 	; BL = font block selector code	
  1955                              <1> 	; NOTE: TRDOS 386 only uses and sets font block 0
  1956                              <1> 	; (It is as BL = 0 for TRDOS 386)
  1957 00001DA0 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  1958                              <1> 	;;mov	ah, bl
  1959                              <1> 	;sub	ah, ah ; 0
  1960                              <1> 	;mov	al, 03h
  1961                              <1> 	; 19/11/2020
  1962 00001DA4 66B80300            <1> 	mov	ax, 03h
  1963 00001DA8 66EF                <1> 	out	dx, ax
  1964                              <1> _sm_19:
  1965                              <1> 	; 29/07/2016
  1966                              <1> 	; 26/07/2016
  1967                              <1> 	; 24/06/2016
  1968                              <1> 	;mov	edi, 0B8000h
  1969                              <1> 	;mov	cx, 4000h ; 16K words (32K)
  1970                              <1> 	;
  1971 00001DAA 30C0                <1> 	xor	al, al
  1972 00001DAC 3805[258E0100]      <1>         cmp     [p_crt_mode], al ; 0 
  1973 00001DB2 7705                <1>         ja      short _sm_20 ; 03h, 80h or 83h
  1974                              <1> 
  1975                              <1> 	; case 1 - 19/11/2020
  1976                              <1> 	;
  1977                              <1> 	; If [pc_crt_mode] = 0, that means, previous mode is 03h
  1978                              <1> 	; and current mode is not 03h (case 1)
  1979                              <1> 
  1980                              <1> 	; 30/07/2016
  1981                              <1> 	; 24/06/2016
  1982                              <1> 	; TRDOS 386 (TRDOS v2) 'set mode' modification
  1983                              <1> 	; (for multiscreen feature):
  1984                              <1> 	; If '_set_mode' procedure is called for video mode 3
  1985                              <1> 	;     while video mode is 3, video page will be cleared
  1986                              <1> 	;     and cursor position of video page will be reset.	  
  1987                              <1> 	; If '_set_mode' procedure is called for a video mode
  1988                              <1> 	;     except video mode 3, while current video mode
  1989                              <1> 	;     is 3, all video pages of mode 3 will be copied 
  1990                              <1> 	;     to 98000h address as backup, before mode change.	 	
  1991                              <1> 	; If '_set_mode' procedure is called for video mode 3
  1992                              <1> 	;     while video mode is not 3 and if there is video
  1993                              <1> 	;     page backup for video mode 3, all (of 8) mode 3
  1994                              <1> 	;     video pages will be restored from 98000h.
  1995                              <1> 
  1996                              <1> 	; 19/11/2020
  1997                              <1> 	;mov	[ACTIVE_PAGE], al ; 0
  1998                              <1> 
  1999                              <1> 	; Here,
  2000                              <1> 	; video memory already cleared if [noclearmem] <> 80h
  2001                              <1> 	
  2002                              <1> 	;mov	ax, 0720h
  2003                              <1> 	;mov	cx, 4000h ; 16K words (32K)
  2004                              <1> 	;mov	edi, 0B8000h
  2005                              <1> 	;rep	stosw
  2006                              <1> 	;sub	al, al
  2007                              <1> 	
  2008                              <1> 	;jmp	short _sm_23
  2009                              <1> 
  2010                              <1> 	; Set hardware side for the new active video page
  2011                              <1>  
  2012 00001DB4 E9FB010000          <1> 	jmp	_set_active_page ; 19/11/2020	
  2013                              <1> 
  2014                              <1> _sm_20:
  2015                              <1> 	; 19/11/2020
  2016                              <1> 	; case 2 or case 3 or case 4 - 19/11/2020
  2017                              <1> 	
  2018                              <1> 	; 19/11/2020
  2019 00001DB9 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 3  ; new video mode
  2020 00001DC0 754F                <1> 	jne	short _sm_22 ; al = 0 (& video mode <> 03h)
  2021                              <1> 			     ; case 4 - 19/11/2020
  2022                              <1> 			     ; ([p_crt_mode] = 83h) 		
  2023                              <1> 
  2024                              <1> 	; case 2 or case 3 - 19/11/2020	
  2025                              <1> 
  2026                              <1> 	;movzx	ebx, byte [ACTIVE_PAGE]
  2027                              <1> 	; 19/11/2020
  2028 00001DC2 A0[268E0100]        <1> 	mov	al, [p_crt_page] ; previous mode 3 active page
  2029                              <1> 	;movzx	ebx, al
  2030                              <1> 	;shl	bl, 1 ; * 2
  2031                              <1> 	;add	ebx, CURSOR_POSN
  2032                              <1> 
  2033                              <1> 	; 29/07/2016
  2034 00001DC7 F605[258E0100]7F    <1> 	test    byte [p_crt_mode], 7Fh ; 83h or 80h or 03h
  2035 00001DCE 740F                <1> 	jz	short _sm_21	; do not restore video pages
  2036                              <1> 				; case 2 - 19/11/2020 
  2037                              <1> 	; case 3 - 19/11/2020
  2038                              <1> 
  2039                              <1> 	; ([p_crt_mode] = 03h)
  2040                              <1> 
  2041                              <1> 	; New video mode is 3 while current video mode is not 3
  2042                              <1> 	; (multi screen) video pages will be restored from 098000h
  2043                              <1> 
  2044                              <1> 	; 19/11/2020
  2045 00001DD0 A2[BE810100]        <1> 	mov	[ACTIVE_PAGE], al ; current mode 3 active page
  2046                              <1> 
  2047                              <1> 	; 12/12/2020
  2048                              <1> 	;; restore video pages
  2049                              <1> 	;mov	esi, 98000h ; 30/07/2016 
  2050                              <1> 	;mov	edi, 0B8000h
  2051                              <1> 	;mov	cx, 2000h ; 8K dwords (32K)
  2052                              <1> 	;rep	movsd
  2053                              <1> 	;
  2054                              <1> 	;; 19/11/2020
  2055                              <1> 	;mov	[p_crt_mode], cl ; reset ('case 3' end condition)
  2056                              <1> 	;
  2057                              <1> 	;; restore cursor positions
  2058                              <1> 	;mov	esi, cursor_pposn
  2059                              <1> 	;mov	edi, CURSOR_POSN
  2060                              <1> 	;;mov	ecx, 4	; restore all cursor positions (16 bytes)
  2061                              <1> 	;mov	cl, 4
  2062                              <1> 	;rep 	movsd
  2063                              <1> 	
  2064                              <1> 	; 12/12/2020
  2065 00001DD5 E89C000000          <1> 	call	_restore_mode3_multiscreen
  2066                              <1> 
  2067                              <1> 	;jmp	short _sm_23 ; do not clear current video pages
  2068                              <1> 
  2069                              <1> 	; 19/11/2020
  2070 00001DDA E9D5010000          <1> 	jmp	_set_active_page
  2071                              <1> 
  2072                              <1> _sm_21:
  2073                              <1> 	; 19/11/2020
  2074                              <1> 	; case 2 
  2075                              <1> 	;
  2076                              <1> 	; ([p_crt_mode] = 80h)
  2077                              <1> 	;
  2078                              <1> 	; User has requested to set video mode 3 again while
  2079                              <1> 	; current video mode is 3.. that means, set mode 03h
  2080                              <1> 	; parameters again and clear video page.
  2081                              <1> 	; ('noclearmem' option effects the result) 
  2082                              <1> 	
  2083                              <1> 	; 19/11/2020
  2084 00001DDF F605[278E0100]80    <1> 	test	byte [noclearmem], 80h
  2085 00001DE6 7529                <1> 	jnz	short _sm_22	; 'do not clear video memory'
  2086                              <1> 				; continue with current text
  2087                              <1> 				; (user's option/choice) 
  2088                              <1> 	; clear video page
  2089                              <1> 	;mov	cx, [CRT_LEN] ; 4096
  2090                              <1> 	;shr	cx, 1 ; 2048 ; 16/11/2020
  2091 00001DE8 66B82007            <1> 	mov	ax, 0720h
  2092                              <1> 	; 26/11/2020
  2093 00001DEC B900080000          <1> 	mov	ecx, 2048 ; 4096/2
  2094 00001DF1 BF00800B00          <1> 	mov	edi, 0B8000h ; [crt_base]
  2095 00001DF6 66033D[AC810100]    <1> 	add	di, [CRT_START]
  2096 00001DFD F366AB              <1> 	rep	stosw	; FILL THE REGEN BUFFER WITH BLANKS
  2097                              <1> 	;
  2098                              <1> 	; 19/11/2020
  2099 00001E00 A0[BE810100]        <1> 	mov	al, [ACTIVE_PAGE] ; 0 to 7 (for video mode 3)
  2100 00001E05 0FB6D8              <1> 	movzx	ebx, al
  2101 00001E08 D0E3                <1> 	shl	bl, 1
  2102 00001E0A 66898B[AE810100]    <1> 	mov	[ebx+CURSOR_POSN], cx ; reset cursor position
  2103                              <1> _sm_22:
  2104                              <1> 	;mov	[p_crt_mode], al ; 0 ; reset
  2105                              <1> 	; 19/11/2020
  2106                              <1> 	;and	byte [p_crt_mode], 3 ; 83h -> 3, 80h -> 0  
  2107 00001E11 8025[258E0100]7F    <1> 	and	byte [p_crt_mode], 7Fh ; 83h -> 3, 80h -> 0  
  2108                              <1> _sm_23:
  2109                              <1> 	; al = video page number
  2110                              <1> 	; [CRT_LEN] = length of regen buffer in bytes
  2111                              <1> 	;call	_set_active_page
  2112                              <1> 	; 16/11/2020
  2113 00001E18 E997010000          <1> 	jmp	_set_active_page
  2114                              <1> 
  2115                              <1> ;-----	NORMAL RETURN FROM ALL VIDEO RETURNS
  2116                              <1> 	;retn
  2117                              <1> 
  2118                              <1> save_mode3_multiscreen:
  2119                              <1> 	; 12/12/2020 (TRDOS v2.0.3)
  2120                              <1> 	; save mode 03h video pages and cursor positions
  2121                              <1> 	;
  2122                              <1> 	; Modified registers: ecx (=0), esi, edi
  2123                              <1> 	
  2124                              <1> 	; 12/12/2020
  2125                              <1> 	; moved here from '_set_mode'	
  2126                              <1> 	; 03/07/2016
  2127                              <1> 	; save video pages
  2128 00001E1D BE00800B00          <1> 	mov	esi, 0B8000h
  2129 00001E22 BF00800900          <1> 	mov	edi, 98000h ; 30/07/2016
  2130 00001E27 B900200000          <1> 	mov	ecx, (0B8000h-0B0000h)/4
  2131 00001E2C F3A5                <1> 	rep	movsd
  2132                              <1> 	
  2133 00001E2E C605[258E0100]03    <1> 	mov	byte [p_crt_mode], 3 ; previous mode, backup sign
  2134                              <1> 	; 26/11/2020
  2135 00001E35 860D[BE810100]      <1> 	xchg	cl, [ACTIVE_PAGE]
  2136 00001E3B 880D[268E0100]      <1> 	mov	[p_crt_page], cl  ; save as previous active page	
  2137                              <1> 	
  2138                              <1> 	; save cursor positions
  2139 00001E41 BE[AE810100]        <1> 	mov	esi, CURSOR_POSN
  2140 00001E46 BF[2A8E0100]        <1> 	mov	edi, cursor_pposn ; cursor positions backup
  2141 00001E4B B104                <1> 	mov	cl, 4
  2142 00001E4D F3A5                <1> 	rep	movsd
  2143 00001E4F C3                  <1> 	retn
  2144                              <1> 
  2145                              <1> restore_mode3_multiscreen:
  2146                              <1> 	; 12/12/2020 (TRDOS v2.0.3)
  2147                              <1> 	; restore mode 03h video pages and cursor positions
  2148                              <1> 	;
  2149                              <1> 	; Input:
  2150                              <1> 	;    settings from the last 'save_mode3_multiscreen'
  2151                              <1> 	;
  2152                              <1> 	; Output: 
  2153                              <1> 	;    AL = active video page = [ACTIVE_PAGE]
  2154                              <1> 	;
  2155                              <1> 	; Modified registers: al, ecx (=0), esi, edi
  2156                              <1> 
  2157 00001E50 A0[268E0100]        <1> 	mov	al, [p_crt_page] ; previous mode 3 active page
  2158 00001E55 A2[BE810100]        <1> 	mov	[ACTIVE_PAGE], al ; current mode 3 active page
  2159                              <1> 
  2160                              <1> 	; 12/12/2020
  2161                              <1> 	; moved here from 'vesa_vbe3_pmi'	
  2162                              <1> 
  2163                              <1> 	; 07/12/2020
  2164                              <1> 	; restore CRT_START according to ACTIVE_PAGE
  2165                              <1> 	;mov	[CRT_START], cx ; 0
  2166                              <1> 	; 12/12/2020
  2167 00001E5A 66C705[AC810100]00- <1> 	mov	word [CRT_START], 0
  2167 00001E62 00                  <1>
  2168                              <1> 
  2169                              <1> 	; check active page and set it again if it is not 0
  2170 00001E63 08C0                <1> 	or	al, al
  2171                              <1> 	;;jz	short vbe3_pmi_7
  2172                              <1> 	;jz	short _restore_mode3_multiscreen
  2173 00001E65 740F                <1> 	jz	short r_m3_ms_1
  2174 00001E67 88C1                <1> 	mov	cl, al
  2175                              <1> ;vbe3_pmi_5:
  2176                              <1> r_m3_ms_0:
  2177 00001E69 668105[AC810100]00- <1> 	add	word [CRT_START], 4096
  2177 00001E71 10                  <1>
  2178 00001E72 FEC9                <1> 	dec	cl
  2179                              <1> 	;jnz	short vbe3_pmi_5
  2180 00001E74 75F3                <1> 	jnz	short r_m3_ms_0
  2181                              <1> r_m3_ms_1:
  2182                              <1> 	; 12/12/2020
  2183                              <1> 	; moved here from '_set_mode'	
  2184                              <1> _restore_mode3_multiscreen:
  2185                              <1> 	; Modified registers: ecx, esi, edi
  2186                              <1> 
  2187                              <1> 	; restore video pages
  2188 00001E76 BE00800900          <1> 	mov	esi, 98000h ; 30/07/2016 
  2189 00001E7B BF00800B00          <1> 	mov	edi, 0B8000h
  2190                              <1> 	;mov	cx, 2000h ; 8K dwords (32K)
  2191 00001E80 B900200000          <1> 	mov	ecx, 2000h
  2192 00001E85 F3A5                <1> 	rep	movsd
  2193                              <1> 
  2194                              <1> 	; 19/11/2020
  2195 00001E87 880D[258E0100]      <1> 	mov	[p_crt_mode], cl ; reset ('case 3' end condition)
  2196                              <1> 
  2197                              <1> 	; restore cursor positions
  2198 00001E8D BE[2A8E0100]        <1> 	mov	esi, cursor_pposn
  2199 00001E92 BF[AE810100]        <1> 	mov	edi, CURSOR_POSN
  2200                              <1> 	;mov	ecx, 4	; restore all cursor positions (16 bytes)
  2201 00001E97 B104                <1> 	mov	cl, 4
  2202 00001E99 F3A5                <1> 	rep 	movsd
  2203 00001E9B C3                  <1> 	retn
  2204                              <1> 
  2205                              <1> cursor_shape_fix:
  2206                              <1> 	; 07/07/2016
  2207                              <1> 	; (Cursor start and cursor end line values -6,7-
  2208                              <1> 	; will be fixed depending on character height)
  2209                              <1> 	;
  2210                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2211                              <1> 	; vgabios-0.7a (2011)
  2212                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2213                              <1> 	; 'vgabios.c', ' biosfn_set_cursor_shape (CH,CL)'
  2214                              <1> 	;
  2215                              <1> 	; INPUT ->
  2216                              <1> 	;	AL = cursor start line (=6)
  2217                              <1> 	;	AH = cursor end line (=7)
  2218                              <1> 	; OUTPUT ->
  2219                              <1> 	;	AL = cursor start line (=14)
  2220                              <1> 	;	AH = cursor end line (=15)
  2221                              <1> 	;
  2222                              <1> 	;; if((modeset_ctl&0x01)&&(cheight>8)&&(CL<8)&&(CH<0x20))
  2223                              <1> 
  2224                              <1> 	;test	byte [VGA_MODESET_CTL], 1 ; VGA active
  2225                              <1> 	;jz	short csf_3
  2226 00001E9C 803D[BE6F0000]08    <1> 	cmp	byte [CHAR_HEIGHT], 8
  2227 00001EA3 7649                <1> 	jna	short csf_3
  2228 00001EA5 80FC08              <1> 	cmp	ah, 8
  2229 00001EA8 7344                <1> 	jnb	short csf_3
  2230 00001EAA 3C20                <1> 	cmp	al, 20h
  2231 00001EAC 7340                <1> 	jnb	short csf_3
  2232                              <1> 	;
  2233 00001EAE 6650                <1> 	push	ax
  2234                              <1> 	; {
  2235                              <1>    	; if(CL!=(CH+1))	
  2236 00001EB0 FEC0                <1> 	inc	al
  2237 00001EB2 38C4                <1> 	cmp	ah, al   ; ah != al + 1
  2238 00001EB4 740F                <1>         je      short csf_1
  2239                              <1> 	; CH = ((CH+1) * cheight / 8) -1;
  2240 00001EB6 8A25[BE6F0000]      <1> 	mov	ah, [CHAR_HEIGHT]
  2241 00001EBC F6E4                <1> 	mul	ah
  2242 00001EBE C0E803              <1> 	shr	al, 3 ; / 8
  2243 00001EC1 FEC8                <1> 	dec	al ; - 1
  2244 00001EC3 EB0E                <1> 	jmp	short csf_2 
  2245                              <1> csf_1: 	
  2246                              <1>  	; }
  2247                              <1>    	; else		; ah = al + 1
  2248                              <1>     	; {
  2249 00001EC5 FEC4                <1> 	inc	ah	; ah = ah + 1   
  2250                              <1> 	; CH = ((CL+1) * cheight / 8) - 2;
  2251 00001EC7 A0[BE6F0000]        <1> 	mov	al, [CHAR_HEIGHT]
  2252 00001ECC F6E4                <1> 	mul	ah
  2253 00001ECE C0E803              <1> 	shr	al, 3 ; / 8
  2254 00001ED1 2C02                <1> 	sub	al, 2 ; - 2
  2255                              <1> 	; al = 14 (if [CHAR_HEIGHT] = 16)
  2256                              <1> csf_2:
  2257 00001ED3 880424              <1> 	mov	[esp], al
  2258 00001ED6 8A642401            <1> 	mov	ah, [esp+1]
  2259                              <1> 	; CL = ((CL+1) * cheight / 8) - 1;
  2260 00001EDA FEC4                <1> 	inc	ah 
  2261 00001EDC A0[BE6F0000]        <1> 	mov	al, [CHAR_HEIGHT]
  2262 00001EE1 F6E4                <1> 	mul	ah
  2263 00001EE3 C0E803              <1> 	shr	al, 3 ; / 8
  2264 00001EE6 FEC8                <1> 	dec	al ; - 1
  2265 00001EE8 88442401            <1> 	mov	[esp+1], al
  2266                              <1> 	; ah = 15 (if [CHAR_HEIGHT] = 16)
  2267                              <1> 	;
  2268 00001EEC 6658                <1> 	pop	ax
  2269                              <1> csf_3:
  2270 00001EEE C3                  <1> 	retn
  2271                              <1> 
  2272                              <1> SET_CTYPE:
  2273                              <1> 	; 12/09/2016
  2274                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  2275 00001EEF 803D[BA6F0000]07    <1> 	cmp	byte [CRT_MODE], 7
  2276 00001EF6 0F875BFCFFFF        <1> 	ja	VIDEO_RETURN ; 12/09/2016
  2277 00001EFC E805000000          <1> 	call	_set_ctype
  2278 00001F01 E951FCFFFF          <1>         jmp     VIDEO_RETURN
  2279                              <1> 
  2280                              <1> _set_ctype:
  2281                              <1> 	; 02/09/2014 (Retro UNIX 386 v1)
  2282                              <1> 	;
  2283                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  2284                              <1> 
  2285                              <1> 	; (CH) = BITS 4-0 = START LINE FOR CURSOR
  2286                              <1> 	;  ** HARDWARE WILL ALWAYS CAUSE BLINK
  2287                              <1> 	;  ** SETTING BIT 5 OR 6 WILL CAUSE ERRATIC BLINKING
  2288                              <1> 	;     OR NO CURSOR AT ALL
  2289                              <1> 	; (CL) = BITS 4-0 = END LINE FOR CURSOR
  2290                              <1> 
  2291                              <1> ;------------------------------------------------
  2292                              <1> ; SET_CTYPE
  2293                              <1> ;	THIS ROUTINE SETS THE CURSOR VALUE
  2294                              <1> ; INPUT
  2295                              <1> ;	(CX) HAS CURSOR VALUE CH-START LINE, CL-STOP LINE
  2296                              <1> ; OUTPUT	
  2297                              <1> ;	NONE
  2298                              <1> ;------------------------------------------------
  2299                              <1> 
  2300                              <1> 	; 07/07/2016
  2301                              <1> 	; Fixing cursor start and stop line depending on
  2302                              <1> 	; current character height (=16)
  2303                              <1> 	; (Note: Default/initial values are 6 and 7.
  2304                              <1> 	; If set values are 6 (start) & 7 (stop) and 
  2305                              <1> 	; [CHAR_HEIGHT] = 16 :
  2306                              <1> 	; After fixing, start line will be 14, stop line
  2307                              <1> 	; will be 15.)
  2308 00001F06 6689C8              <1> 	mov	ax, cx
  2309 00001F09 86C4                <1> 	xchg	al, ah
  2310                              <1> 	; AL = start line, AH = stop line
  2311 00001F0B E88CFFFFFF          <1> 	call	cursor_shape_fix
  2312                              <1> 	; AL = start line (fixed), AH = stop line (fixed)
  2313 00001F10 6689C1              <1> 	mov	cx, ax
  2314 00001F13 86E9                <1> 	xchg	ch, cl
  2315                              <1> 	; CH = start line (fixed), CL = stop line (fixed)
  2316                              <1> 	;
  2317 00001F15 B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
  2318 00001F17 66890D[D36F0000]    <1> 	mov	[CURSOR_MODE], cx ; save in data area
  2319                              <1> 	;call	m16	; output cx register
  2320                              <1> 	;retn
  2321 00001F1E E99F040000          <1>         jmp     m16
  2322                              <1> 
  2323                              <1> SET_CPOS:
  2324                              <1> 	; 12/09/2016
  2325                              <1> 	; 07/07/2016
  2326                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  2327 00001F23 80FF07              <1> 	cmp	bh, 7 ; video page > 7 ; 07/07/2016
  2328 00001F26 0F872BFCFFFF        <1> 	ja	VIDEO_RETURN
  2329                              <1> 	;
  2330 00001F2C 803D[BA6F0000]07    <1> 	cmp	byte [CRT_MODE], 7
  2331 00001F33 770A                <1> 	ja	short vga_set_cpos ; 12/09/2016	
  2332 00001F35 E85D040000          <1> 	call	_set_cpos
  2333 00001F3A E918FCFFFF          <1>         jmp     VIDEO_RETURN
  2334                              <1> 
  2335                              <1> vga_set_cpos:
  2336                              <1> 	; 12/09/2016
  2337                              <1> 	; 09/07/2016
  2338                              <1> 	; set cursor position
  2339                              <1> 	; NOTE: Hardware cursor position will not be set
  2340                              <1> 	;   in any VGA modes (>7)
  2341                              <1> 	;   But, cursor position will be saved into
  2342                              <1> 	;   [CURSOR_POSN].
  2343                              <1> 	;   TRDOS 386 (TRDOS v2.0) uses only one page
  2344                              <1> 	;   (page 0) for all graphics modes.
  2345                              <1> 
  2346 00001F3F 668915[AE810100]    <1> 	mov	[CURSOR_POSN], dx ; save cursor pos for pg 0
  2347                              <1> 	; 04/08/2016
  2348                              <1> 	;mov	bh, [ACTIVE_PAGE] ; = 0
  2349                              <1> 	;call	_set_cpos
  2350 00001F46 E90CFCFFFF          <1> 	jmp     VIDEO_RETURN
  2351                              <1> 
  2352                              <1> READ_CURSOR:
  2353                              <1> 	; 12/09/2016
  2354                              <1> 	; 07/07/2016
  2355                              <1> 	; 12/05/2016
  2356                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  2357                              <1> 	;
  2358                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  2359                              <1> 
  2360                              <1> ;------------------------------------------------------
  2361                              <1> ; READ_CURSOR
  2362                              <1> ;	THIS ROUTINE READS THE CURRENT CURSOR VALUE FROM THE
  2363                              <1> ;	845, FORMATS IT, AND SENDS IT BACK TO THE CALLER
  2364                              <1> ; INPUT
  2365                              <1> ;	BH - PAGE OF CURSOR
  2366                              <1> ; OUTPUT
  2367                              <1> ;	DX - ROW, COLUMN OF THE CURRENT CURSOR POSITION
  2368                              <1> ;	CX - CURRENT CURSOR MODE
  2369                              <1> ;------------------------------------------------------
  2370                              <1> 
  2371                              <1> 	; BH = Video page number (0 to 7)
  2372                              <1> 
  2373                              <1> 	; 07/07/2016
  2374 00001F4B 80FF07              <1> 	cmp	bh, 7 ; video page > 7 (invalid)
  2375 00001F4E 7606                <1> 	jna	short read_cursor_1
  2376                              <1> 	; invalid video page (input) 
  2377 00001F50 31C9                <1> 	xor	ecx, ecx ; 0
  2378 00001F52 31D2                <1> 	xor	edx, edx ; 0
  2379 00001F54 EB15                <1> 	jmp	short read_cursor_2
  2380                              <1> read_cursor_1:
  2381                              <1> 	; 12/09/2016
  2382 00001F56 803D[BA6F0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; vga mode
  2383 00001F5D 7727                <1> 	ja	short vga_get_cpos
  2384                              <1> 	;
  2385 00001F5F E815000000          <1> 	call	get_cpos
  2386 00001F64 0FB70D[D36F0000]    <1> 	movzx	ecx, word [CURSOR_MODE]
  2387                              <1> read_cursor_2:
  2388 00001F6B 5D                  <1> 	pop	ebp
  2389 00001F6C 5F                  <1> 	pop	edi
  2390 00001F6D 5E                  <1> 	pop	esi
  2391 00001F6E 5B                  <1> 	pop	ebx
  2392 00001F6F 58                  <1> 	pop	eax  ; DISCARD SAVED CX AND DX
  2393 00001F70 58                  <1> 	pop	eax
  2394 00001F71 A1[188E0100]        <1> 	mov	eax, [video_eax] ; 12/05/2016
  2395                              <1> 	;;15/01/2017
  2396                              <1> 	;;mov	byte [intflg], 0 ; 07/01/2017
  2397 00001F76 1F                  <1> 	pop	ds
  2398 00001F77 07                  <1> 	pop	es
  2399 00001F78 CF                  <1> 	iretd
  2400                              <1> 
  2401                              <1> get_cpos:
  2402                              <1> 	; 12/05/2016
  2403                              <1> 	; 16/01/2016
  2404                              <1> 	; BH = Video page number (0 to 7)
  2405                              <1> 	;
  2406 00001F79 D0E7                <1> 	shl	bh, 1 ; WORD OFFSET
  2407 00001F7B 0FB6F7              <1> 	movzx	esi, bh 
  2408 00001F7E 0FB796[AE810100]    <1> 	movzx	edx, word [esi+CURSOR_POSN]
  2409 00001F85 C3                  <1> 	retn
  2410                              <1> 
  2411                              <1> vga_get_cpos:
  2412                              <1> 	; 12/09/2016
  2413                              <1> 	; get cursor position (vga)
  2414 00001F86 0FB715[AE810100]    <1> 	movzx	edx, word [CURSOR_POSN] ; cursor pos for pg 0
  2415 00001F8D 31C9                <1> 	xor	ecx, ecx ; Cursor Mode = 0 (invalid)
  2416 00001F8F EBDA                <1> 	jmp     short read_cursor_2
  2417                              <1> 
  2418                              <1> ACT_DISP_PAGE:
  2419                              <1> 	; 07/07/2016
  2420                              <1> 	; 26/06/2016
  2421                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  2422                              <1> 	;
  2423                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  2424                              <1> 	;
  2425                              <1> ;-----------------------------------------------------
  2426                              <1> ; ACT_DISP_PAGE
  2427                              <1> ;	THIS ROUTINE SETS THE ACTIVE DISPLAY PAGE, ALLOWING
  2428                              <1> ;	THE FULL USE OF THE MEMORY SET ASIDE FOR THE VIDEO ATTACHMENT
  2429                              <1> ; INPUT
  2430                              <1> ;	AL HAS THE NEW ACTIVE DISPLAY PAGE
  2431                              <1> ; OUTPUT
  2432                              <1> ;	THE 6845 IS RESET TO DISPLAY THAT PAGE
  2433                              <1> ;-----------------------------------------------------
  2434                              <1> 	; 07/07/2016
  2435 00001F91 3C07                <1> 	cmp	al, 7	; > 7 = invalid video page number
  2436                              <1> 	;ja	VIDEO_RETURN
  2437 00001F93 7715                <1>         ja	short adp_2 ; 18/11/2020
  2438                              <1> 	;cmp	byte [CRT_MODE], 3
  2439                              <1> 	;je	short adp_1
  2440                              <1> 	; 18/11/2020
  2441 00001F95 8A25[BA6F0000]      <1> 	mov	ah, [CRT_MODE]
  2442 00001F9B 80FC03              <1> 	cmp	ah, 3
  2443 00001F9E 7605                <1> 	jna	short adp_1 ; mode 01h, 00h (01h), 02h (03h), 03h
  2444 00001FA0 80FC07              <1> 	cmp	ah, 7	    ; mode 07h (03h)	
  2445 00001FA3 7505                <1> 	jne	short adp_2
  2446                              <1> 	;and 	al, al
  2447                              <1>         ;jnz	VIDEO_RETURN
  2448                              <1> 	;;sub	al, al ; 0 ; force to page 0
  2449                              <1> adp_1:	
  2450 00001FA5 E805000000          <1> 	call	set_active_page
  2451                              <1> adp_2:
  2452 00001FAA E9A8FBFFFF          <1>         jmp     VIDEO_RETURN
  2453                              <1> 
  2454                              <1> set_active_page:   ; tty_sw
  2455                              <1> 	; 09/12/2017
  2456                              <1> 	; 26/07/2016
  2457                              <1> 	; 26/06/2016
  2458                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  2459                              <1> 	; 30/06/2015
  2460                              <1> 	; 04/03/2014  (act_disp_page --> tty_sw)
  2461                              <1> 	; 10/12/2013
  2462                              <1> 	; 04/12/2013
  2463                              <1> 	;
  2464 00001FAF A2[BE810100]        <1> 	mov	[ACTIVE_PAGE], al ; save active page value ; [ptty]
  2465                              <1> _set_active_page:
  2466                              <1> 	; 27/06/2015
  2467 00001FB4 0FB6D8              <1> 	movzx	ebx, al
  2468                              <1> 	;
  2469                              <1> 	;cbw	; 07/09/2014 (ah=0)
  2470 00001FB7 28E4                <1> 	sub	ah, ah ; 09/12/2017
  2471 00001FB9 66F725[288E0100]    <1> 	mul	word [CRT_LEN]  ; get saved length of regen buffer
  2472                              <1> 				; display page times regen length
  2473                              <1> 	; 10/12/2013
  2474 00001FC0 66A3[AC810100]      <1> 	mov	[CRT_START], ax ; save start address for later
  2475 00001FC6 6689C1              <1> 	mov	cx, ax ; start address to cx
  2476                              <1> _M16:
  2477                              <1> 	;sar	cx, 1
  2478 00001FC9 66D1E9              <1> 	shr	cx, 1	; divide by 2 for 6845 handling
  2479 00001FCC B40C                <1> 	mov	ah, 12	; 6845 register for start address
  2480 00001FCE E8EF030000          <1> 	call	m16
  2481                              <1> 	;sal	bx, 1
  2482                              <1> 	; 01/09/2014
  2483 00001FD3 D0E3                <1> 	shl	bl, 1	; *2 for word offset
  2484 00001FD5 81C3[AE810100]      <1> 	add	ebx, CURSOR_POSN
  2485 00001FDB 668B13              <1> 	mov	dx, [ebx] ; get cursor for this page
  2486                              <1> 	; 16/01/2016
  2487                              <1> 	;call	m18
  2488                              <1> 	;retn
  2489 00001FDE E9CB030000          <1> 	jmp	m18
  2490                              <1> 
  2491                              <1> position:
  2492                              <1> 	; 24/06/2016
  2493                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  2494                              <1> 	; 27/06/2015
  2495                              <1> 	; 02/09/2014
  2496                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  2497                              <1> 	; 04/12/2013 (Retro UNIX 8086 v1)
  2498                              <1> 	;
  2499                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  2500                              <1> 	;
  2501                              <1> ;-----------------------------------------
  2502                              <1> ; POSITION
  2503                              <1> ;	THIS SERVICE ROUTINE CALCULATES THE REGEN BUFFER ADDRESS
  2504                              <1> ;	OF A CHARACTER IN THE ALPHA MODE
  2505                              <1> ; INPUT
  2506                              <1> ;	AX = ROW, COLUMN POSITION
  2507                              <1> ; OUTPUT
  2508                              <1> ;	AX = OFFSET OF CHAR POSITION IN REGEN BUFFER
  2509                              <1> ;-----------------------------------------
  2510                              <1> 
  2511                              <1> 	; DX = ROW, COLUMN POSITION
  2512 00001FE3 0FB605[BC6F0000]    <1> 	movzx	eax, byte [CRT_COLS] ; 24/06/2016
  2513 00001FEA F6E6                <1> 	mul	dh	 ; row value
  2514 00001FEC 30F6                <1> 	xor	dh, dh   ; 0	
  2515 00001FEE 6601D0              <1> 	add	ax, dx	 ; add column value to the result
  2516 00001FF1 66D1E0              <1> 	shl	ax, 1	; * 2 for attribute bytes
  2517                              <1> 		; EAX = AX = OFFSET OF CHAR POSITION IN REGEN BUFFER 
  2518 00001FF4 C3                  <1> 	retn
  2519                              <1> 
  2520                              <1> find_position:
  2521                              <1> 	; 24/06/2016
  2522                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  2523                              <1> 	; 27/06/2015
  2524                              <1> 	; 07/09/2014
  2525                              <1> 	; 02/09/2014
  2526                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  2527                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  2528                              <1> 
  2529 00001FF5 0FB6CF              <1> 	movzx	ecx, bh ; video page number
  2530 00001FF8 89CE                <1> 	mov	esi, ecx
  2531 00001FFA 66D1E6              <1> 	shl	si, 1
  2532 00001FFD 668B96[AE810100]    <1> 	mov	dx, [esi+CURSOR_POSN]
  2533 00002004 740C                <1> 	jz	short p21
  2534 00002006 6631F6              <1> 	xor	si, si
  2535                              <1> p20:
  2536 00002009 660335[288E0100]    <1> 	add	si, [CRT_LEN] ; 24/06/2016
  2537                              <1> 	;add	si, 80*25*2 ; add length of buffer for one page		
  2538 00002010 E2F7                <1> 	loop	p20
  2539                              <1> p21:
  2540 00002012 6621D2              <1> 	and	dx, dx
  2541 00002015 7407                <1> 	jz	short p22
  2542 00002017 E8C7FFFFFF          <1> 	call 	position ; determine location in regen in page
  2543 0000201C 01C6                <1> 	add	esi, eax ; add location to start of regen page
  2544                              <1> p22:	
  2545                              <1> 	;mov	dx, [addr_6845] ; get base address of active display			
  2546                              <1> 	;mov	dx, 03D4h ; I/O address of color card
  2547                              <1> 	;add	dx, 6	; point at status port
  2548 0000201E 66BADA03            <1> 	mov	dx, 03DAh ; status port
  2549                              <1> 	; cx = 0
  2550 00002022 C3                  <1> 	retn
  2551                              <1> 
  2552                              <1> SCROLL_UP:
  2553                              <1> 	; 07/07/2016
  2554                              <1> 	; 26/06/2016
  2555                              <1> 	; 12/05/2016
  2556                              <1> 	; 30/01/2016
  2557                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  2558                              <1> 	; 07/09/2014
  2559                              <1> 	; 02/09/2014
  2560                              <1> 	; 01/09/2014 (Retro UNIX 386 v1 - beginning)
  2561                              <1> 	; 04/04/2014
  2562                              <1> 	; 04/12/2013
  2563                              <1> 	;
  2564                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  2565                              <1> 	;
  2566                              <1> ;----------------------------------------------
  2567                              <1> ; SCROLL UP
  2568                              <1> ;	THIS ROUTINE MOVES A BLOCK OF CHARACTERS UP
  2569                              <1> ;	ON THE SCREEN
  2570                              <1> ; INPUT
  2571                              <1> ;	(AH) = CURRENT CRT MODE
  2572                              <1> ;	(AL) = NUMBER OF ROWS TO SCROLL
  2573                              <1> ;	(CX) = ROW/COLUMN OF UPPER LEFT CORNER
  2574                              <1> ;	(DX) = ROW/COLUMN OF LOWER RIGHT CORNER
  2575                              <1> ;	(BH) = ATTRIBUTE TO BE USED ON BLANKED LINE
  2576                              <1> ;	(DS) = DATA SEGMENT
  2577                              <1> ;	(ES) = REGEN BUFFER SEGMENT
  2578                              <1> ; OUTPUT
  2579                              <1> ;	NONE -- THE REGEN BUFFER IS MODIFIED
  2580                              <1> ;--------------------------------------------
  2581                              <1> 
  2582                              <1> 	; 07/07/2016
  2583 00002023 38F5                <1> 	cmp	ch, dh
  2584 00002025 0F872CFBFFFF        <1> 	ja	VIDEO_RETURN
  2585 0000202B 38D1                <1> 	cmp	cl, dl
  2586 0000202D 0F8724FBFFFF        <1> 	ja	VIDEO_RETURN
  2587                              <1> 	;
  2588 00002033 E805000000          <1> 	call	_scroll_up
  2589 00002038 E91AFBFFFF          <1>         jmp     VIDEO_RETURN
  2590                              <1> 
  2591                              <1> _scroll_up:  ; from 'write_tty'
  2592                              <1> 	;
  2593                              <1> 	; cl = left upper column
  2594                              <1> 	; ch = left upper row
  2595                              <1> 	; dl = right lower column
  2596                              <1> 	; dh = right lower row
  2597                              <1> 	;
  2598                              <1> 	; al = line count 
  2599                              <1> 	; bl = attribute to be used on blanked line	
  2600                              <1> 	; bh = video page number (0 to 7)
  2601                              <1> 
  2602 0000203D E89C000000          <1> 	call	test_line_count ; 16/01/2016
  2603                              <1> 
  2604 00002042 8A25[BA6F0000]      <1> 	mov	ah, [CRT_MODE] ; current video mode	
  2605                              <1> 	;;cmp	byte [CRT_MODE], 4
  2606                              <1> 	;cmp	ah, 4 ; 07/07/2016
  2607                              <1> 	;jnb	GRAPHICS_UP ; 26/06/2016
  2608                              <1> 	; 18/11/2020
  2609 00002048 80FC04              <1> 	cmp	ah, 4
  2610 0000204B 720A                <1>  	jb	short n0	
  2611 0000204D 80FC07              <1> 	cmp	ah, 7 ; TEST FOR BW CARD 
  2612                              <1> 		      ;	(80x25 text, mono)
  2613 00002050 7405                <1> 	je	short n0 ; same with mode 3 for TRDOS 386
  2614 00002052 E938050000          <1> 	jmp	GRAPHICS_UP
  2615                              <1> n0:
  2616                              <1> 	; 07/07/2016
  2617 00002057 80FF07              <1> 	cmp	bh, 7 ; video page number
  2618 0000205A 7606                <1> 	jna	short n1
  2619 0000205C 8A3D[BE810100]      <1> 	mov	bh, [ACTIVE_PAGE]
  2620                              <1> n1:
  2621 00002062 88DC                <1> 	mov	ah, bl ; attribute
  2622 00002064 6650                <1> 	push	ax ; *
  2623                              <1> 	;mov 	esi, [CRT_BASE]
  2624 00002066 BE00800B00          <1>         mov     esi, 0B8000h  
  2625 0000206B 3A3D[BE810100]      <1>         cmp     bh, [ACTIVE_PAGE]
  2626 00002071 750B                <1> 	jne	short n2
  2627                              <1> 	;
  2628 00002073 66A1[AC810100]      <1>         mov     ax, [CRT_START]
  2629 00002079 6601C6              <1>         add     si, ax
  2630 0000207C EB11                <1>         jmp     short n4
  2631                              <1> n2:
  2632 0000207E 20FF                <1>         and     bh, bh
  2633 00002080 740D                <1> 	jz	short n4
  2634 00002082 88F8                <1> 	mov	al, bh
  2635                              <1> n3:
  2636 00002084 660335[288E0100]    <1>         add	si, [CRT_LEN]
  2637 0000208B FEC8                <1>         dec	al
  2638 0000208D 75F5                <1> 	jnz	short n3
  2639                              <1> n4:	
  2640 0000208F E85D000000          <1> 	call	scroll_position ; 16/01/2016
  2641 00002094 7420                <1>         jz      short n6 
  2642                              <1> 
  2643 00002096 01CE                <1>         add     esi, ecx ; from address for scroll
  2644 00002098 88F5                <1> 	mov	ch, dh  ; #rows in block
  2645 0000209A 28C5                <1> 	sub	ch, al	; #rows to be moved
  2646                              <1> n5:
  2647 0000209C E894000000          <1> 	call	n10 ; 16/01/2016
  2648                              <1> 	
  2649 000020A1 51                  <1>         push	ecx
  2650 000020A2 0FB60D[BC6F0000]    <1> 	movzx	ecx, byte [CRT_COLS] 
  2651 000020A9 00C9                <1> 	add	cl, cl
  2652 000020AB 01CE                <1>         add	esi, ecx  ; next line
  2653 000020AD 01CF                <1>         add	edi, ecx
  2654 000020AF 59                  <1> 	pop	ecx
  2655                              <1> 
  2656 000020B0 FECD                <1> 	dec	ch	 ; count of lines to move
  2657 000020B2 75E8                <1> 	jnz	short n5 ; row loop
  2658                              <1> 	; ch = 0
  2659 000020B4 88C6                <1> 	mov	dh, al	 ; #rows	
  2660                              <1> n6:
  2661                              <1> 	; attribute in ah
  2662 000020B6 B020                <1> 	mov	al, ' '	 ; fill with blanks
  2663                              <1> n7:
  2664 000020B8 E885000000          <1> 	call	n11 ; 16/01/2016
  2665                              <1> 
  2666 000020BD 8A0D[BC6F0000]      <1> 	mov	cl, [CRT_COLS]
  2667 000020C3 00C9                <1> 	add	cl, cl
  2668 000020C5 01CF                <1>         add	edi, ecx
  2669                              <1> 
  2670 000020C7 FECE                <1> 	dec	dh
  2671 000020C9 75ED                <1> 	jnz	short n7
  2672                              <1> n16:
  2673 000020CB 3A3D[BE810100]      <1> 	cmp	bh, [ACTIVE_PAGE]
  2674 000020D1 750A                <1> 	jne	short n8
  2675                              <1> 	
  2676                              <1> 	;cmp	byte [CRT_MODE], 7 ; is this the black and white card
  2677                              <1> 	;je	short n8	   ; if so, skip the mode reset
  2678                              <1> 
  2679 000020D3 A0[BB6F0000]        <1> 	mov	al, [CRT_MODE_SET] ; get the value of mode set
  2680 000020D8 66BAD803            <1> 	mov	dx, 03D8h ; always set color card port
  2681 000020DC EE                  <1> 	out	dx, al
  2682                              <1> n8:
  2683 000020DD C3                  <1> 	retn
  2684                              <1> 
  2685                              <1> test_line_count:
  2686                              <1> 	; 12/05/2016
  2687                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  2688                              <1> 	; 07/09/2014 (scroll_up)
  2689 000020DE 08C0                <1> 	or	al, al
  2690 000020E0 740E                <1> 	jz	short al_set2
  2691 000020E2 6652                <1> 	push	dx
  2692 000020E4 28EE                <1> 	sub	dh, ch  ; subtract upper row from lower row number
  2693 000020E6 FEC6                <1> 	inc	dh	; adjust difference by 1
  2694 000020E8 38C6                <1> 	cmp	dh, al 	; line count = amount of rows in window?
  2695 000020EA 7502                <1> 	jne	short al_set1 ; if not the we're all set
  2696 000020EC 30C0                <1> 	xor	al, al	; otherwise set al to zero
  2697                              <1> al_set1:
  2698 000020EE 665A                <1> 	pop	dx
  2699                              <1> al_set2:
  2700 000020F0 C3                  <1> 	retn
  2701                              <1> 
  2702                              <1> scroll_position:
  2703                              <1> 	; 26/06/2016
  2704                              <1> 	; 30/01/2016
  2705                              <1>         ; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  2706                              <1> 	; 07/09/2014 (scroll_up)
  2707                              <1> 
  2708 000020F1 6652                <1> 	push	dx
  2709 000020F3 6689CA              <1> 	mov	dx, cx	; now, upper left position in DX
  2710 000020F6 E8E8FEFFFF          <1> 	call	position
  2711 000020FB 01C6                <1> 	add	esi, eax
  2712 000020FD 89F7                <1> 	mov	edi, esi
  2713 000020FF 665A                <1> 	pop	dx	; lower right position in DX
  2714 00002101 6629CA              <1> 	sub	dx, cx
  2715 00002104 FEC6                <1> 	inc	dh	; dh = #rows 
  2716 00002106 FEC2                <1> 	inc	dl	; dl = #cols in block
  2717 00002108 59                  <1> 	pop	ecx 	; return address
  2718 00002109 6658                <1> 	pop	ax	; * ; al = line count, ah = attribute
  2719 0000210B 51                  <1> 	push	ecx	; return address
  2720 0000210C 0FB7C8              <1> 	movzx	ecx, ax
  2721 0000210F 8A25[BC6F0000]      <1> 	mov	ah, [CRT_COLS]
  2722 00002115 F6E4                <1> 	mul	ah	; determine offset to from address
  2723 00002117 6601C0              <1> 	add	ax, ax  ; *2 for attribute byte
  2724                              <1> 	;
  2725 0000211A 6650                <1> 	push	ax	; offset 
  2726 0000211C 6652                <1> 	push	dx
  2727                              <1> 	;
  2728                              <1> 	; 04/04/2014
  2729 0000211E 66BADA03            <1> 	mov	dx, 3DAh ; guaranteed to be color card here	
  2730                              <1> n9:                      ; wait_display_enable
  2731 00002122 EC                  <1>         in      al, dx   ; get port
  2732 00002123 A808                <1> 	test	al, RVRT ; wait for vertical retrace	
  2733 00002125 74FB                <1> 	jz	short n9 ; wait_display_enable
  2734 00002127 B025                <1> 	mov	al, 25h
  2735 00002129 B2D8                <1> 	mov	dl, 0D8h ; address control port
  2736 0000212B EE                  <1> 	out	dx, al	; turn off video during vertical retrace
  2737 0000212C 665A                <1> 	pop	dx	; #rows, #cols
  2738 0000212E 6658                <1>        	pop	ax	; offset
  2739 00002130 6691                <1> 	xchg	ax, cx	; 
  2740                              <1> 	; ecx = offset, al = line count, ah = attribute
  2741                              <1> 	;
  2742 00002132 08C0                <1> 	or	al, al
  2743 00002134 C3                  <1> 	retn
  2744                              <1> n10:
  2745                              <1> 	; Move rows
  2746 00002135 88D1                <1> 	mov	cl, dl	; get # of cols to move
  2747 00002137 56                  <1> 	push	esi
  2748 00002138 57                  <1> 	push	edi	; save start address
  2749                              <1> n10r:
  2750 00002139 66A5                <1> 	movsw		; move that line on screen
  2751 0000213B FEC9                <1> 	dec	cl
  2752 0000213D 75FA                <1>         jnz     short n10r
  2753 0000213F 5F                  <1> 	pop	edi
  2754 00002140 5E                  <1> 	pop	esi	; recover addresses
  2755 00002141 C3                  <1> 	retn
  2756                              <1> n11:
  2757                              <1> 	; Clear rows
  2758                              <1>                 	; dh =  #rows
  2759 00002142 88D1                <1>         mov	cl, dl	; get # of cols to clear
  2760 00002144 57                  <1>         push    edi     ; save address
  2761                              <1> n11r:
  2762 00002145 66AB                <1>         stosw           ; store fill character
  2763 00002147 FEC9                <1> 	dec	cl
  2764 00002149 75FA                <1>         jnz     short n11r
  2765 0000214B 5F                  <1>         pop     edi     ; recover address
  2766 0000214C C3                  <1> 	retn
  2767                              <1> 
  2768                              <1> SCROLL_DOWN:
  2769                              <1> 	; 07/07/2016
  2770                              <1> 	; 27/06/2016
  2771                              <1> 	; 26/06/2016
  2772                              <1> 	; 12/05/2016
  2773                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  2774                              <1> 	;
  2775                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  2776                              <1> 
  2777                              <1> ;------------------------------------------
  2778                              <1> ; SCROLL DOWN
  2779                              <1> ;	THIS ROUTINE MOVES THE CHARACTERS WITHIN A DEFINED
  2780                              <1> ;	BLOCK DOWN ON THE SCREEN, FILLING THE TOP LINES
  2781                              <1> ;	WITH A DEFINED CHARACTER
  2782                              <1> ; INPUT
  2783                              <1> ;	(AH) = CURRENT CRT MODE
  2784                              <1> ;	(AL) = NUMBER OF LINES TO SCROLL
  2785                              <1> ;	(CX) = UPPER LEFT CORNER OF RECION
  2786                              <1> ;	(DX) = LOWER RIGHT CORNER OF REGION
  2787                              <1> ;	(BH) = FILL CHARACTER
  2788                              <1> ;	(DS) = DATA SEGMENT
  2789                              <1> ;	(ES) = REGEN SEGMENT
  2790                              <1> ; OUTPUT
  2791                              <1> ;	NONE -- SCREEN IS SCROLLED
  2792                              <1> ;------------------------------------------
  2793                              <1> 
  2794                              <1> 	; 07/07/2016
  2795 0000214D 38F5                <1> 	cmp	ch, dh
  2796                              <1> 	;ja	VIDEO_RETURN
  2797 0000214F 7709                <1> 	ja	short _s_d_retn ; 18/11/2020
  2798 00002151 38D1                <1> 	cmp	cl, dl
  2799                              <1> 	;ja	VIDEO_RETURN
  2800 00002153 7705                <1> 	ja	short _s_d_retn ; 18/11/2020
  2801                              <1> 	;
  2802 00002155 E805000000          <1> 	call	_scroll_down
  2803                              <1> _s_d_retn:
  2804 0000215A E9F8F9FFFF          <1>         jmp     VIDEO_RETURN
  2805                              <1> 
  2806                              <1> _scroll_down: ; 27/06/2016
  2807                              <1> 
  2808                              <1> 	; cl = left upper column
  2809                              <1> 	; ch = left upper row
  2810                              <1> 	; dl = right lower column
  2811                              <1> 	; dh = right lower row
  2812                              <1> 	;
  2813                              <1> 	; al = line count 
  2814                              <1> 	; bl = attribute to be used on blanked line	
  2815                              <1> 	; bh = video page number (0 to 7)
  2816                              <1> 
  2817                              <1> 	; !!!!
  2818 0000215F FD                  <1> 	std		; DIRECTION FOR SCROLL DOWN
  2819                              <1> 	; !!!!
  2820 00002160 E879FFFFFF          <1> 	call	test_line_count ; 16/01/2016
  2821                              <1> 	
  2822 00002165 8A25[BA6F0000]      <1> 	mov	ah, [CRT_MODE] ; current video mode	
  2823                              <1> 	;;cmp	byte [CRT_MODE], 4
  2824                              <1> 	;cmp	ah, 4 ; 07/07/2016
  2825                              <1> 	;jnb	GRAPHICS_DOWN ; 26/06/2016
  2826                              <1> 	; 18/11/2020
  2827 0000216B 80FC04              <1> 	cmp	ah, 4
  2828 0000216E 720A                <1>  	jb	short _n0	
  2829 00002170 80FC07              <1> 	cmp	ah, 7 ; TEST FOR BW CARD 
  2830                              <1> 		      ;	(80x25 text, mono)
  2831 00002173 7405                <1> 	je	short _n0 ; same with mode 3 for TRDOS 386
  2832 00002175 E9F9070000          <1> 	jmp	GRAPHICS_DOWN
  2833                              <1> _n0:
  2834                              <1> 	; 07/07/2016
  2835 0000217A 80FF07              <1> 	cmp	bh, 7 ; video page number
  2836 0000217D 7606                <1> 	jna	short n12
  2837 0000217F 8A3D[BE810100]      <1> 	mov	bh, [ACTIVE_PAGE]
  2838                              <1> 	;
  2839                              <1> n12:			; CONTINUE_DOWN
  2840 00002185 88DC                <1> 	mov	ah, bl
  2841 00002187 6650                <1> 	push	ax	; * ; save attribute in ah
  2842 00002189 6689D0              <1> 	mov	ax, dx	; LOWER RIGHT CORNER
  2843 0000218C E860FFFFFF          <1> 	call	scroll_position	; GET REGEN LOCATION
  2844 00002191 741F                <1> 	jz	short n14
  2845 00002193 29CE                <1> 	sub	esi, ecx  ; SI IS FROM ADDRESS
  2846 00002195 88F5                <1> 	mov	ch, dh  ; #rows in block
  2847 00002197 28C5                <1> 	sub	ch, al	; #rows to be moved
  2848                              <1> n13:
  2849 00002199 E897FFFFFF          <1> 	call	n10	; MOVE ONE ROW
  2850                              <1> 
  2851 0000219E 51                  <1> 	push	ecx
  2852 0000219F 8A0D[BC6F0000]      <1> 	mov	cl, [CRT_COLS] 
  2853 000021A5 00C9                <1> 	add	cl, cl
  2854 000021A7 29CE                <1>         sub	esi, ecx  ; next line
  2855 000021A9 29CF                <1>         sub	edi, ecx
  2856 000021AB 59                  <1>         pop	ecx
  2857                              <1> 	
  2858 000021AC FECD                <1> 	dec	ch	 ; count of lines to move
  2859 000021AE 75E9                <1> 	jnz	short n13 ; row loop
  2860                              <1> 	; ch = 0
  2861 000021B0 88C6                <1> 	mov	dh, al	 ; #rows
  2862                              <1> n14:
  2863                              <1> 	; attribute in ah
  2864 000021B2 B020                <1> 	mov	al, ' '	 ; fill with blanks
  2865                              <1> n15:
  2866 000021B4 E889FFFFFF          <1> 	call	n11 ; 16/01/2016
  2867                              <1> 
  2868 000021B9 8A0D[BC6F0000]      <1> 	mov	cl, [CRT_COLS]
  2869 000021BF 00C9                <1> 	add	cl, cl
  2870 000021C1 29CF                <1>         sub	edi, ecx
  2871                              <1>         
  2872 000021C3 FECE                <1> 	dec	dh
  2873 000021C5 75ED                <1> 	jnz	short n15
  2874                              <1> 	;
  2875                              <1> 	; 18/11/2020
  2876 000021C7 FC                  <1> 	cld	; clear direction flag	
  2877                              <1> 	;
  2878 000021C8 E9FEFEFFFF          <1> 	jmp	n16 ; 27/06/2016
  2879                              <1> 
  2880                              <1> ;	cmp	bh, [ACTIVE_PAGE]
  2881                              <1> ;	jne	short n16
  2882                              <1> ;
  2883                              <1> ;	;cmp	byte [CRT_MODE], 7	; is this the black and white card
  2884                              <1> ;	;je	short n16		; if so, skip the mode reset
  2885                              <1> ;
  2886                              <1> ;	mov	al, [CRT_MODE_SET] ; get the value of mode set
  2887                              <1> ;	mov	dx, 03D8h ; always set color card port
  2888                              <1> ;	out	dx, al
  2889                              <1> ;n16:
  2890                              <1> ;	; !!!!
  2891                              <1> ;	cld		; Clear direction flag !
  2892                              <1> ;	; !!!!
  2893                              <1> ;	retn
  2894                              <1> 
  2895                              <1> READ_AC_CURRENT:
  2896                              <1> 	; 08/07/2016
  2897                              <1> 	; 26/06/2016
  2898                              <1> 	; 12/05/2016
  2899                              <1> 	; 18/01/2016
  2900                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  2901                              <1> 	;
  2902                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  2903                              <1> 	;
  2904                              <1> 	; 08/07/2016
  2905 000021CD 803D[BA6F0000]07    <1>         cmp     byte [CRT_MODE], 7 ; 6!?
  2906 000021D4 7607                <1> 	jna	short read_ac_c
  2907 000021D6 31C0                <1> 	xor	eax, eax
  2908 000021D8 E97FF9FFFF          <1>         jmp     _video_return 
  2909                              <1> read_ac_c:
  2910 000021DD E805000000          <1> 	call	_read_ac_current
  2911                              <1> 	; 12/05/2016
  2912                              <1>         ;jmp     VIDEO_RETURN
  2913 000021E2 E975F9FFFF          <1> 	jmp	_video_return
  2914                              <1> 
  2915                              <1> ;------------------------------------------------------------------------
  2916                              <1> ; READ_AC_CURRENT							:
  2917                              <1> ;	THIS ROUTINE READS THE ATTRIBUTE AND CHARACTER AT THE CURRENT	:
  2918                              <1> ;	CURSOR POSITION AND RETURNS THEM TO THE CALLER			:
  2919                              <1> ; INPUT									:
  2920                              <1> ;	(AH) = CURRENT CRT MODE						:
  2921                              <1> ;	(BH) = DISPLAY PAGE ( ALPHA MODES ONLY )			:
  2922                              <1> ;	(DS) = DATA SEGMENT						:
  2923                              <1> ;	(ES) = REGEN SEGMENT						:
  2924                              <1> ; OUTPUT								:
  2925                              <1> ;	(AL) = CHARACTER READ						:
  2926                              <1> ;	(AH) = ATTRIBUTE READ						:
  2927                              <1> ;------------------------------------------------------------------------
  2928                              <1> 
  2929                              <1> _read_ac_current:
  2930                              <1> 	; 26/06/2016
  2931                              <1> 	; 12/05/2016 
  2932                              <1> 	; 18/01/2016
  2933                              <1> 
  2934 000021E7 8A25[BA6F0000]      <1> 	mov	ah, [CRT_MODE] ; current video mode	
  2935 000021ED 80FC04              <1> 	cmp	ah, 4
  2936 000021F0 720A                <1>  	jb	short p10
  2937                              <1> 	; 18/11/2020
  2938                              <1> 	;cmp	byte [CRT_MODE], 4
  2939                              <1> 	;jnb	GRAPHICS_READ ; 26/06/2016
  2940                              <1> 
  2941 000021F2 80FC07              <1> 	cmp	ah, 7 ; TEST FOR BW CARD (80x25 monochrome text)
  2942 000021F5 7405                <1> 	je	short p10	 ; same with mode 3 in TRDOS 386
  2943 000021F7 E9CD080000          <1> 	jmp	GRAPHICS_READ
  2944                              <1> p10:
  2945 000021FC E8F4FDFFFF          <1> 	call	find_position	; GET REGEN LOCATION AND PORT ADDRESS
  2946                              <1> 	;
  2947                              <1> 	; esi = regen location
  2948                              <1> 	; dx = status port
  2949                              <1> 	;
  2950                              <1> 
  2951                              <1> 	; 18/11/2020
  2952                              <1> 	; convert display mode to a zero value 
  2953                              <1> 	; for 80 column color mode
  2954                              <1> 	;mov	ah, [CRT_MODE]	
  2955                              <1> 	;sub	ah, 2
  2956                              <1> 	;shr	ah, 1
  2957                              <1> 	;jnz	short p13
  2958                              <1> 
  2959                              <1> 	; 05/12/2020
  2960                              <1> 	; 18/11/2020 (TRDOS 386 v2.0.3)
  2961                              <1> 	;xor	bl, bl	; 0
  2962 00002201 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 03h ; 80x25 color text
  2963                              <1> 	;je	short p11    ; Note: Only mode 03h and mode 01h are
  2964                              <1> 	;inc	bl	; 1  ;       in use by TRDOS 386 as text modes	
  2965                              <1> 	;jmp	short p14    ;       (07h, 00h and 02h are redirected)		
  2966 00002208 7516                <1> 	jne	short p13
  2967                              <1> 
  2968                              <1> 	; 05/12/2020
  2969 0000220A 3A3D[BE810100]      <1> 	cmp     bh, [ACTIVE_PAGE]
  2970 00002210 750E                <1> 	jne	short p13 
  2971                              <1> 
  2972                              <1> 	; WAIT FOR HORIZONTAL RETRACE OR VERTICAL RETRACE IF COLOR 80
  2973                              <1> p11:
  2974 00002212 FB                  <1> 	sti		; enable interrupts first
  2975                              <1> 	; 05/12/2020
  2976 00002213 90                  <1> 	nop
  2977                              <1> 	; 18/11/2020
  2978                              <1> 	;or	bl, bl
  2979                              <1> 	;jnz	short p13 ; mode 01h (and mode 00h) - 40x25 color text
  2980 00002214 FA                  <1> 	cli 		; block interrupts for single loop
  2981 00002215 EC                  <1> 	in	al, dx	; get status from the adapter
  2982 00002216 A801                <1> 	test	al, RHRZ ; is horizontal retrace low
  2983 00002218 75F8                <1> 	jnz	short p11 ; wait until it is
  2984                              <1> p12:			;  wait for either retrace high
  2985 0000221A EC                  <1> 	in	al, dx ; get status again
  2986 0000221B A809                <1> 	test	al, RVRT+RHRZ ; is horizontal or vertical retrace high
  2987 0000221D 74FB                <1> 	jz	short p12 ; wait until either retrace active
  2988                              <1> ;p14:
  2989 0000221F FB                  <1> 	sti
  2990                              <1> p13:
  2991 00002220 81C600800B00        <1> 	add	esi, 0B8000h 
  2992 00002226 668B06              <1> 	mov	ax, [esi]
  2993                              <1> 
  2994 00002229 C3                  <1> 	retn	; 18/01/2016
  2995                              <1> 
  2996                              <1> WRITE_AC_CURRENT:
  2997                              <1> 	; 08/07/2016
  2998                              <1> 	; 26/06/2016
  2999                              <1> 	; 24/06/2016
  3000                              <1> 	; 12/05/2016
  3001                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  3002                              <1> 	;
  3003                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  3004                              <1> 	;
  3005                              <1> ;----------------------------------------------------------------
  3006                              <1> ; WRITE_AC_CURRENT						:
  3007                              <1> ;	THTS ROUTINE WRITES THE ATTRIBUTE AND CHARACTER		:
  3008                              <1> ;	AT THE CURRENT CURSOR POSITION				:
  3009                              <1> ; INPUT								:
  3010                              <1> ;	(AH) = CURRENT CRT MODE					:
  3011                              <1> ;	(BH) = DISPLAY PAGE					:
  3012                              <1> ;	(CX) = COUNT OF CHARACTERS TO WRITE			:
  3013                              <1> ;	(AL) = CHAR TO WRITE					:
  3014                              <1> ;	(BL) = ATTRIBUTE OF CHAR TO WRITE			:
  3015                              <1> ;	(DS) = DATA SEGMENT					:
  3016                              <1> ;	(ES) = REGEN SEGMENT					:
  3017                              <1> ; OUTPUT							:
  3018                              <1> ;	DISPLAY REGEN BUFFER UPDATED				:
  3019                              <1> ;----------------------------------------------------------------
  3020                              <1> 
  3021                              <1> 	; 08/07/2016
  3022 0000222A 803D[BA6F0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6!?
  3023 00002231 760A                <1> 	jna	short write_ac_c
  3024                              <1> 
  3025 00002233 E8070B0000          <1> 	call	vga_write_char_attr
  3026 00002238 E91AF9FFFF          <1> 	jmp     VIDEO_RETURN	
  3027                              <1> 
  3028                              <1> write_ac_c:
  3029 0000223D E834000000          <1> 	call	_write_c_current
  3030                              <1> 
  3031 00002242 0FB6F7              <1> 	movzx	esi, bh ; video page number (0 to 7)	
  3032 00002245 889E[C36F0000]      <1> 	mov	[esi+chr_attrib], bl ; color/attribute
  3033                              <1> 
  3034 0000224B E907F9FFFF          <1>         jmp     VIDEO_RETURN
  3035                              <1> 
  3036                              <1> WRITE_C_CURRENT:
  3037                              <1> 	; 08/07/2016
  3038                              <1> 	; 26/06/2016
  3039                              <1> 	; 12/05/2016
  3040                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  3041                              <1> 	;
  3042                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  3043                              <1> 	;
  3044                              <1> ;----------------------------------------------------------------
  3045                              <1> ; WRITE_C_CURRENT						:
  3046                              <1> ;	THIS ROUTINE WRITES THE CHARACTER AT			:
  3047                              <1> ;	THE CURRENT CURSOR POSITION, ATTRIBUTE UNCHANGED	:
  3048                              <1> ; INPUT								:
  3049                              <1> ;	(AH) = CURRENT CRT MODE					:
  3050                              <1> ;	(BH) = DISPLAY PAGE					:
  3051                              <1> ;	(CX) = COUNT OF CHARACTERS TO WRITE			:
  3052                              <1> ;	(AL) = CHAR TO WRITE					:
  3053                              <1> ;	(DS) = DATA SEGMENT					:
  3054                              <1> ;	(ES) = REGEN SEGMENT					:
  3055                              <1> ; OUTPUT							:
  3056                              <1> ;	DISPLAY REGEN BUFFER UPDATED				:
  3057                              <1> ;----------------------------------------------------------------
  3058                              <1> 
  3059                              <1> 	; 08/07/2016
  3060 00002250 803D[BA6F0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6!?
  3061 00002257 760A                <1> 	jna	short write_c_c
  3062                              <1> 
  3063 00002259 E8E10A0000          <1> 	call	vga_write_char_only
  3064 0000225E E9F4F8FFFF          <1> 	jmp     VIDEO_RETURN	
  3065                              <1> 
  3066                              <1> write_c_c:
  3067                              <1> 	;and	bh, 7 ; video page number (<= 7)
  3068 00002263 0FB6F7              <1> 	movzx	esi, bh	
  3069 00002266 8A9E[C36F0000]      <1> 	mov	bl, [esi+chr_attrib]
  3070                              <1> 
  3071 0000226C E805000000          <1> 	call	_write_c_current
  3072 00002271 E9E1F8FFFF          <1>         jmp     VIDEO_RETURN
  3073                              <1> 
  3074                              <1> _write_c_current:  ; from 'write_tty'
  3075                              <1> 	; 18/11/2020
  3076                              <1> 	; 26/06/2016
  3077                              <1> 	; 24/06/2016
  3078                              <1> 	; 12/05/2016
  3079                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  3080                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  3081                              <1> 	; 18/01/2014
  3082                              <1> 	; 04/12/2013
  3083                              <1> 	;
  3084                              <1> 	; VIDEO.ASM - 06/10/85 VIDEO DISPLAY BIOS
  3085                              <1> 
  3086                              <1> 	; 18/11/2020
  3087 00002276 8A25[BA6F0000]      <1> 	mov	ah, [CRT_MODE] ; current video mode	
  3088 0000227C 80FC04              <1> 	cmp	ah, 4
  3089 0000227F 720A                <1>  	jb	short p40
  3090                              <1> 	
  3091                              <1> 	;cmp	byte [CRT_MODE], 4
  3092                              <1>         ;jnb	GRAPHICS_WRITE ; 26/06/2016
  3093                              <1> 
  3094 00002281 80FC07              <1> 	cmp	ah, 7 ; TEST FOR BW CARD
  3095 00002284 7405                <1> 	je	short p40
  3096 00002286 E98E070000          <1> 	jmp	GRAPHICS_WRITE
  3097                              <1> p40:
  3098                              <1> 	; al = character
  3099                              <1> 	; bl = color/attribute
  3100                              <1> 	; bh = video page
  3101                              <1> 	; cx = count of characters to write
  3102 0000228B 6652                <1> 	push	dx
  3103 0000228D 88DC                <1> 	mov	ah, bl  ; color/attribute (12/05/2016)
  3104 0000228F 6650                <1> 	push	ax	; save character & attribute/color
  3105 00002291 6651                <1> 	push	cx
  3106 00002293 E85DFDFFFF          <1> 	call 	find_position  ; get regen location and port address
  3107 00002298 6659                <1> 	pop	cx
  3108                              <1> 	; esi = regen location
  3109                              <1> 	; dx = status port
  3110                              <1> 	;
  3111 0000229A 81C600800B00        <1> 	add	esi, 0B8000h ; 30/08/2014 (crt_base) 
  3112                              <1> 	;
  3113                              <1> 	; 18/11/2020
  3114                              <1> 	; convert display mode to a zero value 
  3115                              <1> 	; for 80 column color mode
  3116                              <1> 	;mov	ah, [CRT_MODE]	
  3117                              <1> 	;sub	ah, 2
  3118                              <1> 	;shr	ah, 1
  3119                              <1> 	;jnz	short p44    ; 26/06/2016
  3120                              <1> 
  3121                              <1> 	; 05/12/2020
  3122                              <1> 	; 18/11/2020 (TRDOS 386 v2.0.3)
  3123                              <1> 	;xor	bl, bl	; 0
  3124 000022A0 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 03h ; 80x25 color text
  3125                              <1> 	;je	short p41    ; Note: Only mode 03h and mode 01h are
  3126                              <1> 	;inc	bl	; 1  ;       in use by TRDOS 386 as text modes	
  3127                              <1> 	;jmp	short p43    ;       (07h, 00h and 02h are redirected)			
  3128                              <1> 	; 05/12/2020
  3129 000022A7 751A                <1> 	jne	short p44
  3130                              <1> p46:
  3131                              <1> 	; 05/12/2020
  3132 000022A9 3A3D[BE810100]      <1> 	cmp     bh, [ACTIVE_PAGE]
  3133 000022AF 7512                <1> 	jne	short p44
  3134                              <1> 
  3135                              <1> 	; WAIT FOR HORIZONTAL RETRACE OR VERTICAL RETRACE IF COLOR 80
  3136                              <1> p41:
  3137                              <1> 	; 05/12/2020
  3138 000022B1 FB                  <1> 	sti		; enable interrupts first
  3139 000022B2 90                  <1> 	nop
  3140                              <1> 	; 18/11/2020
  3141                              <1> 	;or	bl, bl
  3142                              <1> 	;jnz	short p44 ; mode 01h (and mode 00h) - 40x25 color text
  3143 000022B3 FA                  <1> 	cli 		; block interrupts for single loop
  3144 000022B4 EC                  <1> 	in	al, dx	; get status from the adapter
  3145 000022B5 A808                <1> 	test	al, RVRT ; check for vertical retrace first
  3146 000022B7 7509                <1> 	jnz	short p43 ; Do fast write now if vertical retrace
  3147 000022B9 A801                <1> 	test	al, RHRZ ; is horizontal retrace low
  3148 000022BB 75F4                <1> 	jnz	short p41 ; wait until it is
  3149                              <1> p42:			;  wait for either retrace high
  3150 000022BD EC                  <1> 	in	al, dx ; get status again
  3151 000022BE A809                <1> 	test	al, RVRT+RHRZ ; is horizontal or vertical retrace high
  3152 000022C0 74FB                <1> 	jz	short p42 ; wait until either retrace active
  3153                              <1> p43:	
  3154 000022C2 FB                  <1> 	sti
  3155                              <1> p44:
  3156 000022C3 668B0424            <1> 	mov	ax, [esp] ; restore the character (al) & attribute (ah)
  3157 000022C7 668906              <1> 	mov	[esi], ax
  3158                              <1> 
  3159 000022CA 6649                <1> 	dec	cx
  3160 000022CC 740D                <1> 	jz	short p45
  3161                              <1> 
  3162 000022CE 46                  <1> 	inc	esi
  3163 000022CF 46                  <1> 	inc	esi
  3164                              <1> 
  3165                              <1> 	; 05/12/2020
  3166 000022D0 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 03h
  3167 000022D7 75EA                <1> 	jne	short p44
  3168                              <1> 	;jmp	short p41
  3169 000022D9 EBCE                <1> 	jmp	short p46
  3170                              <1> p45:	
  3171 000022DB 6658                <1> 	pop	ax
  3172 000022DD 665A                <1> 	pop	dx
  3173 000022DF C3                  <1> 	retn
  3174                              <1> 
  3175                              <1> ; 09/07/2016
  3176                              <1> ; 26/06/2016
  3177                              <1> ; 24/06/2016
  3178                              <1> ; 12/05/2016
  3179                              <1> ; 18/01/2016
  3180                              <1> ; 16/01/2016 - TRDOS 386 (TRDOS v2.0)
  3181                              <1> ; 30/06/2015
  3182                              <1> ; 27/06/2015
  3183                              <1> ; 11/03/2015
  3184                              <1> ; 02/09/2014
  3185                              <1> ; 30/08/2014
  3186                              <1> ; VIDEO FUNCTIONS
  3187                              <1> ; (write_tty - Retro UNIX 8086 v1 - U9.ASM, 01/02/2014)
  3188                              <1> 
  3189                              <1> WRITE_TTY:
  3190                              <1> 	; 09/12/2017
  3191                              <1> 	; 09/07/2016
  3192                              <1> 	; 01/07/2016
  3193                              <1> 	; 26/06/2016
  3194                              <1> 	; 24/06/2016
  3195                              <1> 	; 13/05/2016
  3196                              <1> 	; 12/05/2016
  3197                              <1> 	; 30/01/2016
  3198                              <1> 	; 18/01/2016
  3199                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  3200                              <1> 	; 13/08/2015
  3201                              <1> 	; 02/09/2014
  3202                              <1> 	; 30/08/2014 (Retro UNIX 386 v1 - beginning)
  3203                              <1> 	; 01/02/2014 (Retro UNIX 8086 v1 - last update)
  3204                              <1> 	; 03/12/2013 (Retro UNIX 8086 v1 - beginning)	
  3205                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, ESI, EDI)
  3206                              <1> 	;
  3207                              <1> 	; INPUT -> AL = Character to be written
  3208                              <1> 	;	   BL = Color (Forecolor, Backcolor)
  3209                              <1> 	;	   BH = Video Page (0 to 7)
  3210                              <1> 
  3211                              <1> 	; 09/07/2016
  3212 000022E0 803D[BA6F0000]07    <1>         cmp     byte [CRT_MODE], 7
  3213 000022E7 760A                <1> 	jna 	short write_tty_cga
  3214                              <1> 
  3215 000022E9 E83C0D0000          <1> 	call	vga_write_teletype
  3216 000022EE E964F8FFFF          <1> 	jmp	VIDEO_RETURN
  3217                              <1> 
  3218                              <1> write_tty_cga:
  3219                              <1> 	; 13/05/2016
  3220                              <1> 	;call	_write_tty
  3221                              <1> 	; 01/07/2016
  3222 000022F3 E818000000          <1> 	call	_write_tty_m3
  3223 000022F8 E95AF8FFFF          <1> 	jmp	VIDEO_RETURN
  3224                              <1> 
  3225                              <1> RVRT	equ	00001000b	; VIDEO VERTICAL RETRACE BIT
  3226                              <1> RHRZ	equ	00000001b	; VIDEO HORIZONTAL RETRACE BIT
  3227                              <1> 
  3228                              <1> ; Derived from "WRITE_TTY" procedure of IBM "pc-at" rombios source code
  3229                              <1> ; (06/10/1985), 'video.asm', INT 10H, VIDEO_IO
  3230                              <1> ;
  3231                              <1> ; 06/10/85  VIDEO DISPLAY BIOS
  3232                              <1> ;
  3233                              <1> ;--- WRITE_TTY ------------------------------------------------------------------
  3234                              <1> ;										:
  3235                              <1> ;   THIS INTERFACE PROVIDES A TELETYPE LIKE INTERFACE TO THE			:
  3236                              <1> ;   VIDEO CARDS. THE INPUT CHARACTER IS WRITTEN TO THE CURRENT			:
  3237                              <1> ;   CURSOR POSITION, AND THE CURSOR IS MOVED TO THE NEXT POSITION.		:
  3238                              <1> ;   IF THE CURSOR LEAVES THE LAST COLUMN OF THE FIELD, THE COLUMN		:
  3239                              <1> ;   IS SET TO ZERO, AND THE ROW VALUE IS INCREMENTED. IF THE ROW		:
  3240                              <1> ;   ROW VALUE LEAVES THE FIELD, THE CURSOR IS PLACED ON THE LAST ROW,		:
  3241                              <1> ;   FIRST COLUMN, AND THE ENTIRE SCREEN IS SCROLLED UP ONE LINE.		:
  3242                              <1> ;   WHEN THE SCREEN IS SCROLLED UP, THE ATTRIBUTE FOR FILLING THE		:
  3243                              <1> ;   NEWLY BLANKED LINE IS READ FROM THE CURSOR POSITION ON THE PREVIOUS		:
  3244                              <1> ;   LINE BEFORE THE SCROLL, IN CHARACTER MODE. IN GRAPHICS MODE,		:
  3245                              <1> ;   THE 0 COLOR IS USED.							:
  3246                              <1> ;   ENTRY --									:
  3247                              <1> ;     (AH) = CURRENT CRT MODE							:
  3248                              <1> ;     (AL) = CHARACTER TO BE WRITTEN						:
  3249                              <1> ;	    NOTE THAT BACK SPACE, CARRIAGE RETURN, BELL AND LINE FEED ARE	:
  3250                              <1> ;	    HANDLED AS COMMANDS RATHER THAN AS DISPLAY GRAPHICS CHARACTERS	:
  3251                              <1> ;     (BL) = FOREGROUND COLOR FOR CHAR WRITE IF CURRENTLY IN A GRAPHICS MODE	:
  3252                              <1> ;   EXIT -- 									:
  3253                              <1> ;     ALL REGISTERS SAVED							:
  3254                              <1> ;--------------------------------------------------------------------------------
  3255                              <1> 
  3256                              <1> ; 18/11/2020 (TRDOS 386 v2.0.3)
  3257                              <1> ; 09/12/2017
  3258                              <1> ; 08/07/2016
  3259                              <1> ; 26/06/2016
  3260                              <1> ; 24/06/2016
  3261                              <1> _write_tty:
  3262                              <1> 	; 13/05/2016
  3263                              <1> 	; --- 18/11/2020 ---
  3264                              <1> 	; NOTE:
  3265                              <1> 	; Only kernel calls "_write_tty" procedure...
  3266                              <1> 	; TRDOS 386 v2 kernel uses video mode 3 for displaying
  3267                              <1> 	; (some error) messages and also mainprog command interpreter
  3268                              <1> 	; (in kernel) uses "_write_tty".
  3269                              <1> 	; So, here video mode must be set to 3 if it is not 3.
  3270                              <1>  
  3271 000022FD FA                  <1> 	cli	; disable interrupts
  3272                              <1> 	;
  3273                              <1> 	; 01/09/2014
  3274 000022FE 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 3
  3275 00002305 7409                <1> 	je	short _write_tty_m3
  3276                              <1> 	;
  3277                              <1> set_mode_3:
  3278 00002307 53                  <1> 	push	ebx
  3279 00002308 50                  <1> 	push	eax
  3280                              <1> 	;call	_set_mode
  3281                              <1> 	; 18/11/2020 
  3282 00002309 E858F8FFFF          <1> 	call	set_txt_mode  ; set video mode to 03h 
  3283 0000230E 58                  <1> 	pop	eax
  3284 0000230F 5B                  <1> 	pop	ebx
  3285                              <1> 	;
  3286                              <1> _write_tty_m3: ; 24/06/2016 (m3 -> _write_tty_m3)
  3287 00002310 0FB6F7              <1> 	movzx 	esi, bh ; 12/05/2016
  3288 00002313 66D1E6              <1> 	shl	si, 1
  3289 00002316 81C6[AE810100]      <1> 	add	esi, CURSOR_POSN
  3290 0000231C 668B16              <1> 	mov	dx, [esi]
  3291                              <1> 	;
  3292                              <1> 	; dx now has the current cursor position
  3293                              <1> 	;
  3294 0000231F 3C0D                <1> 	cmp	al, 0Dh	; CR	; is it carriage return or control character
  3295 00002321 763E                <1> 	jbe	short u8
  3296                              <1> 	;
  3297                              <1> 	; write the char to the screen
  3298                              <1> u0:	
  3299                              <1> 	; al = character
  3300                              <1> 	; bl = attribute/color
  3301                              <1> 	; bh = video page number (0 to 7)
  3302                              <1> 	;
  3303 00002323 66B90100            <1> 	mov	cx, 1  ; 24/06/2016
  3304                              <1> 	; cx = count of characters to write
  3305                              <1> 	;
  3306 00002327 E84AFFFFFF          <1> 	call	_write_c_current ; 16/01/2015
  3307                              <1> 	;
  3308                              <1> 	; position the cursor for next char
  3309 0000232C FEC2                <1> 	inc	dl		; next column
  3310 0000232E 3A15[BC6F0000]      <1> 	cmp	dl, [CRT_COLS]  ; test for column overflow 
  3311 00002334 7561                <1>         jne     _set_cpos
  3312 00002336 B200                <1> 	mov	dl, 0		; column = 0
  3313                              <1> u10:				; (line feed found)
  3314 00002338 80FE18              <1> 	cmp	dh, 25-1 	; check for last row
  3315 0000233B 7220                <1> 	jb 	short u6
  3316                              <1> 	;
  3317                              <1> 	; scroll required
  3318                              <1> u1:	
  3319                              <1> 	; SET CURSOR POSITION (04/12/2013)
  3320 0000233D E855000000          <1> 	call	_set_cpos
  3321                              <1> 	;
  3322                              <1> 	; determine value to fill with during scroll
  3323                              <1> u2:
  3324                              <1> 	; bh = video page number
  3325                              <1> 	;
  3326 00002342 E8A0FEFFFF          <1> 	call	_read_ac_current ; 18/01/2016
  3327                              <1> 	;
  3328                              <1> 	; al = character, ah = attribute
  3329                              <1> 	; bh = video page number
  3330                              <1> 	; 18/11/2020
  3331 00002347 88E3                <1> 	mov	bl, ah ; color/attribute 	
  3332                              <1> u3:
  3333                              <1> 	;;mov	ax, 0601h 	; scroll one line
  3334                              <1> 	;;sub	cx, cx		; upper left corner
  3335                              <1> 	;;mov	dh, 25-1 	; lower right row
  3336                              <1> 	;;;mov	dl, [CRT_COLS]
  3337                              <1> 	;mov	dl, 80		; lower right column	
  3338                              <1> 	;;dec	dl
  3339                              <1> 	;;mov	dl, 79
  3340                              <1> 
  3341                              <1> 	;;call	scroll_up	; 04/12/2013
  3342                              <1> 	;;; 11/03/2015
  3343                              <1> 	; 02/09/2014
  3344                              <1> 	;;;mov	cx, [crt_ulc] ; Upper left corner  (0000h)
  3345                              <1> 	;;;mov	dx, [crt_lrc] ; Lower right corner (184Fh)
  3346                              <1> 	; 11/03/2015
  3347 00002349 6629C9              <1> 	sub	cx, cx
  3348                              <1> 	;mov	dx, 184Fh ; dl = 79 (column), dh = 24 (row)
  3349                              <1> 	; 18/11/2020
  3350 0000234C B618                <1> 	mov	dh, 25-1
  3351 0000234E 8A15[BC6F0000]      <1> 	mov	dl, [CRT_COLS]
  3352 00002354 FECA                <1> 	dec	dl
  3353                              <1> 	;
  3354 00002356 B001                <1> 	mov	al, 1		; scroll 1 line up
  3355                              <1> 		; ah = attribute
  3356                              <1> 	;mov	bl, al ; 12/05/2016
  3357 00002358 E9E0FCFFFF          <1> 	jmp	_scroll_up	; 16/01/2016
  3358                              <1> ;u4:
  3359                              <1> 	;;int	10h		; video-call return
  3360                              <1> 				; scroll up the screen
  3361                              <1> 				; tty return
  3362                              <1> ;u5:
  3363                              <1> 	;retn			; return to the caller
  3364                              <1> 
  3365                              <1> u6:				; set-cursor-inc
  3366 0000235D FEC6                <1> 	inc	dh		; next row
  3367                              <1> 				; set cursor
  3368                              <1> ;u7:					
  3369                              <1> 	;;mov	ah, 02h
  3370                              <1> 	;;jmp	short u4 	; establish the new cursor
  3371                              <1> 	;call	_set_cpos
  3372                              <1> 	;jmp 	short u5
  3373 0000235F EB36                <1> 	jmp     _set_cpos
  3374                              <1> 
  3375                              <1> 	; check for control characters
  3376                              <1> u8:
  3377 00002361 7432                <1> 	je	short u9
  3378 00002363 3C0A                <1> 	cmp	al, 0Ah		; is it a line feed (0Ah)
  3379 00002365 74D1                <1> 	je	short u10
  3380 00002367 3C07                <1> 	cmp	al, 07h 	; is it a bell
  3381 00002369 7476                <1> 	je	short u11
  3382 0000236B 3C08                <1> 	cmp	al, 08h		; is it a backspace
  3383                              <1> 	;jne	short u0
  3384 0000236D 741E                <1> 	je	short bs	; 12/12/2013
  3385                              <1> 	; 12/12/2013 (tab stop)
  3386 0000236F 3C09                <1> 	cmp	al, 09h		; is it a tab stop
  3387 00002371 75B0                <1> 	jne	short u0
  3388 00002373 88D0                <1> 	mov	al, dl
  3389                              <1> 	;cbw
  3390 00002375 30E4                <1> 	xor	ah, ah ; 09/12/2017
  3391 00002377 B108                <1> 	mov	cl, 8
  3392 00002379 F6F1                <1> 	div	cl
  3393 0000237B 28E1                <1> 	sub	cl, ah
  3394                              <1> ts:
  3395                              <1> 	; 02/09/2014
  3396                              <1> 	; 01/09/2014
  3397                              <1> 	;mov	al, 20h
  3398                              <1> tsloop:
  3399 0000237D 6651                <1> 	push	cx
  3400                              <1> 	; 18/11/2020
  3401                              <1> 	;push	ax
  3402                              <1> 	;;mov	bh, [ACTIVE_PAGE]
  3403                              <1> 	; 05/12/2020
  3404                              <1> 	;push	bx
  3405 0000237F B020                <1> 	mov	al, 20h ; al = space (blank) 
  3406                              <1> 			; bl = color/attribute
  3407 00002381 E88AFFFFFF          <1> 	call	_write_tty_m3 ; 24/06/2016 (m3 -> _write_tty_m3)
  3408                              <1> 	; 05/12/2020
  3409                              <1> 	; bx is preserved in '_write_tty_m3'
  3410                              <1> 	; 18/11/2020
  3411                              <1> 	;pop	bx  ; BL = color/attribute, Bh = video page 
  3412                              <1> 	;pop	ax  ; AL = character
  3413 00002386 6659                <1> 	pop	cx
  3414 00002388 FEC9                <1> 	dec	cl
  3415 0000238A 75F1                <1> 	jnz	short tsloop
  3416 0000238C C3                  <1> 	retn
  3417                              <1> bs:	
  3418                              <1> 	; back space found
  3419                              <1> 
  3420 0000238D 08D2                <1> 	or	dl, dl 		; is it already at start of line
  3421                              <1> 	;je	short u7 	; set_cursor
  3422 0000238F 7406                <1> 	jz	short _set_cpos
  3423 00002391 664A                <1> 	dec	dx     		; no -- just move it back
  3424                              <1> 	;jmp	short u7
  3425 00002393 EB02                <1> 	jmp	short _set_cpos
  3426                              <1> 
  3427                              <1> 	; carriage return found
  3428                              <1> u9:
  3429 00002395 B200                <1> 	mov	dl, 0 		; move to first column
  3430                              <1> 	;jmp	short u7
  3431                              <1> 	;jmp	short _set_cpos ; 30/01/2016
  3432                              <1> 
  3433                              <1> 	; line feed found
  3434                              <1> ;u10:
  3435                              <1> ;	cmp	dh, 25-1 	; bottom of screen
  3436                              <1> ;	jne	short u6 	; no, just set the cursor
  3437                              <1> ;       jmp     u1              ; yes, scroll the screen
  3438                              <1> 
  3439                              <1> _set_cpos:
  3440                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  3441                              <1> 	; 27/06/2015
  3442                              <1> 	; 01/09/2014
  3443                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  3444                              <1> 	;
  3445                              <1> 	; 04/12/2013 - 12/12/2013 (Retro UNIX 8086 v1) 
  3446                              <1> 	;
  3447                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  3448                              <1> 	;
  3449                              <1> ;----------------------------------------------
  3450                              <1> ; SET_CPOS
  3451                              <1> ;	THIS ROUTINE SETS THE CURRENT CURSOR POSITION TO THE
  3452                              <1> ;	NEW X-Y VALUES PASSED
  3453                              <1> ; INPUT
  3454                              <1> ;	DX - ROW,COLUMN OF NEW CURSOR
  3455                              <1> ;	BH - DISPLAY PAGE OF CURSOR
  3456                              <1> ; OUTPUT
  3457                              <1> ;	CURSOR ID SET AT 6845 IF DISPLAY PAGE IS CURRENT DISPLAY
  3458                              <1> ;----------------------------------------------
  3459                              <1> 	;
  3460 00002397 BE[AE810100]        <1> 	mov	esi, CURSOR_POSN
  3461 0000239C 0FB6C7              <1>         movzx   eax, bh	; BH = video page number
  3462                              <1> ;	or	al, al
  3463                              <1> ;	jz	short _set_cpos_0
  3464 0000239F D0E0                <1>         shl     al, 1   ; word offset
  3465 000023A1 01C6                <1>         add     esi, eax
  3466                              <1> ;_set_cpos_0:
  3467 000023A3 668916              <1> 	mov	[esi], dx ; save the pointer
  3468 000023A6 383D[BE810100]      <1> 	cmp	[ACTIVE_PAGE], bh
  3469 000023AC 7532                <1> 	jne	short m17
  3470                              <1> 	;call	m18	; CURSOR SET
  3471                              <1> ;m17:			; SET_CPOS_RETURN
  3472                              <1> 	; 01/09/2014
  3473                              <1> ;	retn
  3474                              <1> 		; DX  = row/column
  3475                              <1> m18:
  3476 000023AE E830FCFFFF          <1> 	call	position ; determine location in regen buffer	
  3477 000023B3 668B0D[AC810100]    <1> 	mov	cx, [CRT_START]
  3478 000023BA 6601C1              <1> 	add	cx, ax  ; add char position in regen buffer
  3479                              <1> 			; to the start address (offset) for this page
  3480 000023BD 66D1E9              <1> 	shr	cx, 1	; divide by 2 for char only count
  3481 000023C0 B40E                <1> 	mov	ah, 14	; register number for cursor
  3482                              <1> 	;call	m16	; output value to the 6845	
  3483                              <1> 	;retn
  3484                              <1> 
  3485                              <1> 	;-----	THIS ROUTINE OUTPUTS THE CX REGISTER
  3486                              <1> 	;	TO THE 6845 REGISTERS NAMED IN (AH)
  3487                              <1> m16:
  3488 000023C2 FA                  <1> 	cli
  3489                              <1> 	;mov	dx, [addr_6845] ; address register
  3490 000023C3 66BAD403            <1> 	mov 	dx, 03D4h ; I/O address of color card
  3491 000023C7 88E0                <1> 	mov	al, ah	; get value
  3492 000023C9 EE                  <1> 	out	dx, al	; register set
  3493 000023CA 6642                <1> 	inc	dx	; data register
  3494 000023CC EB00                <1> 	jmp	$+2	; i/o delay
  3495 000023CE 88E8                <1> 	mov	al, ch	; data
  3496 000023D0 EE                  <1> 	out	dx, al	
  3497 000023D1 664A                <1> 	dec	dx	
  3498 000023D3 88E0                <1> 	mov	al, ah
  3499 000023D5 FEC0                <1> 	inc	al	; point to other data register
  3500 000023D7 EE                  <1> 	out	dx, al	; set for second register
  3501 000023D8 6642                <1> 	inc	dx
  3502 000023DA EB00                <1> 	jmp	$+2	; i/o delay
  3503 000023DC 88C8                <1> 	mov	al, cl	; second data value
  3504 000023DE EE                  <1> 	out	dx, al
  3505 000023DF FB                  <1> 	sti
  3506                              <1> m17:
  3507 000023E0 C3                  <1> 	retn
  3508                              <1> 
  3509                              <1> beeper: 
  3510                              <1> 	; 04/08/2016
  3511                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  3512                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  3513                              <1> 	; 18/01/2014
  3514                              <1> 	; 03/12/2013
  3515                              <1> 	; bell found
  3516                              <1> u11:
  3517 000023E1 FB                  <1> 	sti
  3518 000023E2 3A3D[BE810100]      <1> 	cmp	bh, [ACTIVE_PAGE]
  3519 000023E8 7551                <1> 	jne	short u12	; Do not sound the beep 
  3520                              <1> 				; if it is not written on the active page
  3521                              <1> beeper_gfx: ; 04/08/2016
  3522 000023EA 66B93305            <1> 	mov	cx, 1331 	; divisor for 896 hz tone
  3523 000023EE B31F                <1> 	mov	bl, 31		; set count for 31/64 second for beep
  3524                              <1> 	;call	beep		; sound the pod bell
  3525                              <1> 	;jmp	short u5 	; tty_return
  3526                              <1> 	;retn
  3527                              <1> 	
  3528                              <1> TIMER	equ 	040h   		; 8254 TIMER - BASE ADDRESS
  3529                              <1> PORT_B	equ	061h		; PORT B READ/WRITE DIAGNOSTIC REGISTER
  3530                              <1> GATE2	equ	00000001b	; TIMER 2 INPUT CATE CLOCK BIT
  3531                              <1> SPK2	equ	00000010b	; SPEAKER OUTPUT DATA ENABLE BIT
  3532                              <1> 
  3533                              <1> beep:
  3534                              <1> 	; 07/02/2015
  3535                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  3536                              <1> 	; 18/01/2014
  3537                              <1> 	; 03/12/2013
  3538                              <1> 	;
  3539                              <1> 	; TEST4.ASM - 06/10/85  POST AND BIOS UTILITY ROUTINES
  3540                              <1> 	;
  3541                              <1> 	; ROUTINE TO SOUND THE BEEPER USING TIMER 2 FOR TONE
  3542                              <1> 	;
  3543                              <1> 	; ENTRY:
  3544                              <1> 	;    (BL) = DURATION COUNTER ( 1 FOR 1/64 SECOND )
  3545                              <1> 	;    (CX) = FREQUENCY DIVISOR (1193180/FREQUENCY) (1331 FOR 886 HZ)
  3546                              <1> 	; EXIT:				:
  3547                              <1> 	;    (AX),(BL),(CX) MODIFIED.
  3548                              <1> 
  3549 000023F0 9C                  <1> 	pushf  ; 18/01/2014	; save interrupt status
  3550 000023F1 FA                  <1> 	cli			; block interrupts during update
  3551 000023F2 B0B6                <1> 	mov	al, 10110110b	; select timer 2, lsb, msb binary
  3552 000023F4 E643                <1> 	out	TIMER+3, al 	; write timer mode register
  3553 000023F6 EB00                <1> 	jmp	$+2		; I/O delay
  3554 000023F8 88C8                <1> 	mov	al, cl		; divisor for hz (low)
  3555 000023FA E642                <1> 	out	TIMER+2,AL	; write timer 2 count - lsb
  3556 000023FC EB00                <1> 	jmp	$+2		; I/O delay
  3557 000023FE 88E8                <1> 	mov	al, ch		; divisor for hz (high)
  3558 00002400 E642                <1> 	out	TIMER+2, al	; write timer 2 count - msb
  3559 00002402 E461                <1> 	in	al, PORT_B	; get current setting of port
  3560 00002404 88C4                <1> 	mov	ah, al		; save that setting
  3561 00002406 0C03                <1> 	or	al, GATE2+SPK2	; gate timer 2 and turn speaker on
  3562 00002408 E661                <1> 	out	PORT_B, al	; and restore interrupt status
  3563                              <1> 	;popf	; 18/01/2014
  3564 0000240A FB                  <1> 	sti
  3565                              <1> g7:				; 1/64 second per count (bl)
  3566 0000240B B90B040000          <1> 	mov	ecx, 1035	; delay count for 1/64 of a second	
  3567 00002410 E827000000          <1> 	call	waitf		; go to beep delay 1/64 count
  3568 00002415 FECB                <1> 	dec	bl		; (bl) length count expired?
  3569 00002417 75F2                <1> 	jnz	short g7	; no - continue beeping speaker
  3570                              <1> 	;
  3571                              <1> 	;pushf			; save interrupt status
  3572 00002419 FA                  <1> 	cli  	; 18/01/2014	; block interrupts during update
  3573 0000241A E461                <1> 	in	al, PORT_B	; get current port value
  3574                              <1>         ;or      al, not (GATE2+SPK2) ; isolate current speaker bits in case
  3575 0000241C 0CFC                <1>         or      al, ~(GATE2+SPK2)
  3576 0000241E 20C4                <1>         and	ah, al		; someone turned them off during beep
  3577 00002420 88E0                <1> 	mov	al, ah		; recover value of port
  3578                              <1>         ;or      al, not (GATE2+SPK2) ; force speaker data off
  3579 00002422 0CFC                <1> 	or 	al, ~(GATE2+SPK2) ; isolate current speaker bits in case
  3580 00002424 E661                <1> 	out	PORT_B, al	; and stop speaker timer
  3581                              <1> 	;popf			; restore interrupt flag state
  3582 00002426 FB                  <1> 	sti
  3583 00002427 B90B040000          <1> 	mov	ecx, 1035	; force 1/64 second delay (short)
  3584 0000242C E80B000000          <1> 	call	waitf		; minimum delay between all beeps
  3585                              <1> 	;pushf			; save interrupt status
  3586 00002431 FA                  <1> 	cli			; block interrupts during update
  3587 00002432 E461                <1> 	in	al, PORT_B	; get current port value in case	
  3588 00002434 2403                <1> 	and	al, GATE2+SPK2	; someone turned them on
  3589 00002436 08E0                <1> 	or	al, ah		; recover value of port_b
  3590 00002438 E661                <1> 	out	PORT_B, al	; restore speaker status
  3591 0000243A 9D                  <1> 	popf			; restore interrupt flag state
  3592                              <1> u12:	
  3593 0000243B C3                  <1> 	retn
  3594                              <1> 
  3595                              <1> REFRESH_BIT equ	00010000b 	; REFRESH TEST BIT
  3596                              <1> 
  3597                              <1> WAITF:
  3598                              <1> waitf:
  3599                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  3600                              <1> 	; 03/12/2013
  3601                              <1> 	;
  3602                              <1> ;	push ax			; save work register (ah)	
  3603                              <1> ;waitf1:
  3604                              <1> 				; use timer 1 output bits
  3605                              <1> ;	in	al, PORT_B	; read current counter output status
  3606                              <1> ;	and	al, REFRESH_BIT	; mask for refresh determine bit
  3607                              <1> ;	cmp	al, ah		; did it just change
  3608                              <1> ;	je	short waitf1	; wait for a change in output line
  3609                              <1> ;	;
  3610                              <1> ;	mov	ah, al		; save new lflag state
  3611                              <1> ;	loop	waitf1		; decrement half cycles till count end		
  3612                              <1> ;	;
  3613                              <1> ;	pop	ax		; restore (ah)
  3614                              <1> ;	retn			; return (cx)=0
  3615                              <1> 
  3616                              <1> ; 06/02/2015 (unix386.s <-- dsectrm2.s)
  3617                              <1> ; 17/12/2014 (dsectrm2.s)
  3618                              <1> ; WAITF
  3619                              <1> ; /// IBM PC-XT Model 286 System BIOS Source Code - Test 4 - 06/10/85 ///
  3620                              <1> ;
  3621                              <1> ;---WAITF-----------------------------------------------------------------------
  3622                              <1> ;	FIXED TIME WAIT ROUTINE (HARDWARE CONTROLLED - NOT PROCESSOR)
  3623                              <1> ; ENTRY:
  3624                              <1> ;	(CX) =	COUNT OF 15.085737 MICROSECOND INTERVALS TO WAIT
  3625                              <1> ;	      	MEMORY REFRESH TIMER 1 OUTPUT USED AS REFERENCE
  3626                              <1> ; EXIT:
  3627                              <1> ;	       	AFTER (CX) TIME COUNT (PLUS OR MINUS 16 MICROSECONDS)
  3628                              <1> ;	(CX) = 0	
  3629                              <1> ;-------------------------------------------------------------------------------
  3630                              <1> 
  3631                              <1> ; Refresh period: 30 micro seconds (15-80 us)
  3632                              <1> ; (16/12/2014 - AWARDBIOS 1999 - ATORGS.ASM, WAIT_REFRESH)
  3633                              <1> 
  3634                              <1> ;WAITF:					; DELAY FOR (CX)*15.085737 US
  3635 0000243C 6650                <1> 	PUSH	AX			; SAVE WORK REGISTER (AH)
  3636                              <1> 	; 16/12/2014
  3637                              <1> 	;shr	cx, 1			; convert to count of 30 micro seconds
  3638 0000243E D1E9                <1> 	shr	ecx, 1	; 21/02/2015
  3639                              <1> ;17/12/2014	
  3640                              <1> ;WAITF1:
  3641                              <1> ;	IN	AL, PORT_B   ;061h	; READ CURRENT COUNTER OUTPUT STATUS
  3642                              <1> ;	AND	AL, REFRESH_BIT	;00010000b ; MASK FOR REFRESH DETERMINE BIT
  3643                              <1> ;	CMP	AL, AH			; DID IT JUST CHANGE
  3644                              <1> ;	JE	short WAITF1		; WAIT FOR A CHANGE IN OUTPUT LINE
  3645                              <1> ;	MOV	AH, AL			; SAVE NEW FLAG STATE
  3646                              <1> ;	LOOP	WAITF1			; DECREMENT HALF CYCLES TILL COUNT END		
  3647                              <1> 	;
  3648                              <1> 	; 17/12/2014
  3649                              <1> 	;
  3650                              <1> 	; Modification from 'WAIT_REFRESH' procedure of AWARD BIOS - 1999
  3651                              <1> 	;
  3652                              <1> ;WAIT_REFRESH:  Uses port 61, bit 4 to have CPU speed independent waiting.
  3653                              <1> ;   	INPUT:  CX = number of refresh periods to wait
  3654                              <1> ;     	       (refresh periods = 1 per 30 microseconds on most machines)
  3655                              <1> WR_STATE_0:
  3656 00002440 E461                <1> 	IN	AL,PORT_B		; IN AL,SYS1
  3657 00002442 A810                <1> 	TEST	AL,010H
  3658 00002444 74FA                <1> 	JZ	SHORT WR_STATE_0
  3659                              <1> WR_STATE_1:
  3660 00002446 E461                <1> 	IN	AL,PORT_B		; IN AL,SYS1
  3661 00002448 A810                <1> 	TEST	AL,010H
  3662 0000244A 75FA                <1> 	JNZ	SHORT WR_STATE_1
  3663 0000244C E2F2                <1>         LOOP    WR_STATE_0
  3664                              <1> 	;
  3665 0000244E 6658                <1> 	POP	AX			; RESTORE (AH)
  3666 00002450 C3                  <1> 	RETn				; (CX) = 0
  3667                              <1> 
  3668                              <1> ; 09/07/2016
  3669                              <1> ; 01/07/2016
  3670                              <1> ; 24/06/2016
  3671                              <1> ; 23/06/2016 - TRDOS 386 (TRDOS v2.0)
  3672                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3673                              <1> ;-------------------------------------------------------------------------------
  3674                              <1> ; WRITE_STRING								       :
  3675                              <1> ;	THIS ROUTINE WRITES A STRING OF CHARACTERS TO THE CRT.		       :
  3676                              <1> ; INPUT 								       :
  3677                              <1> ;	(AL) = WRITE STRING COMMAND  0 - 3				       :
  3678                              <1> ;	(BH) = DISPLAY PAGE (ACTIVE PAGE)				       :
  3679                              <1> ;	(CX) = COUNT OF CHARACTERS TO WRITE, IF (CX) = 0 THEN RETURN	       :
  3680                              <1> ;	(DX) = CURSOR POSITION FOR START OF STRING WRITE		       :
  3681                              <1> ;	(BL) = ATTRIBUTE OF CHARACTER TO WRITE IF (AL) = 0  OR	(AL) = 1       :
  3682                              <1> ;	(eBP) = SOURCE STRING OFFSET					       :
  3683                              <1> ; OUTPUT								       :
  3684                              <1> ;	NONE								       :
  3685                              <1> ;-------------------------------------------------------------------------------
  3686                              <1> 
  3687                              <1> ; AL = 00h: Assign all characters the attribute in BL; do not update cursor
  3688                              <1> ; AL = 01h: Assign all characters the attribute in BL; update cursor
  3689                              <1> ; AL = 02h: Use attributes in string; do not update cursor
  3690                              <1> ; AL = 03h: Use attributes in string; update cursor
  3691                              <1> 
  3692                              <1> WRITE_STRING:
  3693                              <1> 	; 12/09/2016
  3694                              <1> 	; 09/07/2016
  3695                              <1> 	;cmp	byte [CRT_MODE], 7 ; 6?!
  3696                              <1> 	;ja	VIDEO_RETURN		; not a valid function for VGA modes
  3697                              <1> 	;
  3698 00002451 A2[248E0100]        <1> 	mov	[w_str_cmd], al		; save (AL) command
  3699 00002456 3C04                <1> 	CMP	AL, 4			; TEST FOR INVALID WRITE STRING OPTION
  3700 00002458 0F83F9F6FFFF        <1> 	JNB	VIDEO_RETURN		; IF OPTION INVALID THEN RETURN
  3701                              <1> 
  3702                              <1>         ;JCXZ   VIDEO_RETURN            ; IF ZERO LENGTH STRING THEN RETURN
  3703                              <1> 
  3704 0000245E 67E362              <1>         jcxz    P55			; 01/07/2016
  3705                              <1> 
  3706                              <1> 	; 01/07/2016
  3707                              <1> 	;and	ecx, 0FFFFh
  3708                              <1> 	; ECX = byte count
  3709                              <1> 	;push	ecx
  3710 00002461 89EE                <1> 	mov	esi, ebp ; user buffer
  3711 00002463 BF00000700          <1> 	mov	edi, Cluster_Buffer  ; system buffer
  3712 00002468 E8A1EE0000          <1> 	call	transfer_from_user_buffer
  3713                              <1> 	;pop	ecx
  3714 0000246D 0F82E4F6FFFF        <1> 	jc	VIDEO_RETURN
  3715                              <1> 	; ecx = transfer (byte) count = character count
  3716 00002473 BD00000700          <1> 	mov	ebp, Cluster_Buffer
  3717                              <1> 	; 12/09/2016
  3718 00002478 803D[BA6F0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6?!
  3719 0000247F 0F87A1000000        <1> 	ja	vga_write_string
  3720                              <1> 	;
  3721 00002485 0FB6F7              <1> 	movzx	esi, bh			; GET CURRENT CURSOR PAGE
  3722 00002488 66D1E6              <1> 	SAL	SI, 1			; CONVERT TO PAGE OFFSET  (SI= PAGE)
  3723                              <1> 	; *****
  3724 0000248B 66FFB6[AE810100]    <1> 	PUSH	word [eSI+CURSOR_POSN]	; SAVE CURRENT CURSOR POSITION IN STACK
  3725                              <1> 
  3726                              <1> 	;MOV	AX,0200H		; SET NEW CURSOR POSITION
  3727                              <1> 	;INT	10H
  3728                              <1> P50next:	
  3729 00002492 51                  <1> 	push	ecx ; ****
  3730 00002493 53                  <1> 	push	ebx ; *** ; 18/11/2020
  3731 00002494 56                  <1> 	push	esi ; **
  3732 00002495 52                  <1> 	push	edx ; *
  3733 00002496 E8FCFEFFFF          <1> 	call	_set_cpos
  3734                              <1> P50:
  3735 0000249B 8A4500              <1> 	MOV	AL, [eBP]		; GET CHARACTER FROM INPUT STRING
  3736 0000249E 45                  <1> 	INC	eBP			; BUMP POINTER TO CHARACTER
  3737                              <1> 
  3738                              <1> ;-----	TEST FOR SPECIAL CHARACTER'S
  3739                              <1> 
  3740 0000249F 3C08                <1> 	CMP	AL, 08H			; IS IT A BACKSPACE
  3741 000024A1 7410                <1> 	JE	short P51		; BACK_SPACE
  3742 000024A3 3C0D                <1> 	CMP	AL, 0Dh ; CR		; IS IT CARRIAGE RETURN
  3743 000024A5 740C                <1> 	JE	short P51		; CAR_RET
  3744 000024A7 3C0A                <1> 	CMP	AL, 0Ah ; LF		; IS IT A LINE FEED
  3745 000024A9 7408                <1> 	JE	short P51		; LINE_FEED
  3746                              <1> 	; 18/11/2020
  3747 000024AB 3C09                <1> 	cmp	al, 09h			; is it a tab stop
  3748 000024AD 7404                <1> 	je	short P51
  3749                              <1> 	;
  3750 000024AF 3C07                <1> 	CMP	AL, 07h			; IS IT A BELL
  3751 000024B1 7515                <1> 	JNE	short P52		; IF NOT THEN DO WRITE CHARACTER
  3752                              <1> P51:
  3753                              <1> 	;MOV	AH,0EH			; TTY_CHARACTER_WRITE
  3754                              <1> 	;INT	10H			; WRITE TTY CHARACTER TO THE CRT
  3755                              <1> 	
  3756 000024B3 E858FEFFFF          <1> 	call	_write_tty_m3
  3757                              <1> 
  3758 000024B8 5A                  <1> 	pop	edx ; *
  3759 000024B9 5E                  <1> 	pop	esi ; **
  3760                              <1> 
  3761 000024BA 668B96[AE810100]    <1> 	MOV	DX, [eSI+CURSOR_POSN]	; GET CURRENT CURSOR POSITION
  3762 000024C1 EB44                <1> 	JMP	SHORT P54		; SET CURSOR POSITION AND CONTINUE
  3763                              <1> P55:
  3764 000024C3 E98FF6FFFF          <1> 	JMP	VIDEO_RETURN
  3765                              <1> P52:
  3766 000024C8 66B90100            <1> 	MOV	CX, 1			; SET CHARACTER WRITE AMOUNT TO ONE
  3767 000024CC 803D[248E0100]02    <1> 	CMP	byte [w_str_cmd], 2	; IS THE ATTRIBUTE IN THE STRING
  3768 000024D3 7204                <1> 	JB	short P53		; IF NOT THEN SKIP
  3769 000024D5 8A5D00              <1> 	MOV	BL, [eBP]		; ELSE GET NEW ATTRIBUTE
  3770 000024D8 45                  <1> 	INC	eBP			; BUMP STRING POINTER
  3771                              <1> P53:
  3772                              <1> 	;MOV	AH,09H			; GOT_CHARACTER
  3773                              <1> 	;INT	10H			; WRITE CHARACTER TO THE CRT
  3774                              <1> 
  3775 000024D9 E898FDFFFF          <1> 	call	_write_c_current
  3776                              <1> 	
  3777 000024DE 5A                  <1> 	pop	edx ; *	
  3778                              <1> 
  3779                              <1> 	; 05/12/2020
  3780                              <1> 	; bx is preserved in '_write_c_current'
  3781                              <1> 	; 18/11/2020
  3782                              <1> 	;mov	ebx, [esp+4]	; ***
  3783                              <1> 
  3784 000024DF 0FB6F7              <1> 	movzx	esi, bh ; video page number (0 to 7)	
  3785 000024E2 889E[C36F0000]      <1> 	mov	[esi+chr_attrib], bl ; color/attribute
  3786                              <1> 
  3787 000024E8 FEC2                <1> 	INC	DL			; INCREMENT COLUMN COUNTER
  3788 000024EA 3A15[BC6F0000]      <1> 	CMP	DL, [CRT_COLS]		; IF COLS ARE WITHIN RANGE FOR THIS MODE
  3789                              <1> 	;JB	short P54		;    THEN GO TO COLUMNS SET
  3790 000024F0 7214                <1> 	jb	short P56 ; 05/12/2020
  3791 000024F2 FEC6                <1> 	INC	DH			; BUMP ROW COUNTER BY ONE
  3792 000024F4 28D2                <1> 	SUB	DL, DL			; SET COLUMN COUNTER TO ZERO
  3793 000024F6 80FE19              <1> 	CMP	DH, 25			; IF ROWS ARE LESS THAN 25 THEN
  3794                              <1> 	;JB	short P54		; GO TO ROWS_COLUMNS_SET
  3795 000024F9 720B                <1> 	jb	short P56 ; 05/12/2020
  3796                              <1> 
  3797                              <1> 	; 18/11/2020
  3798                              <1> 	;MOV	AX,0E0AH		; ELSE SCROLL SCREEN
  3799                              <1> 	;INT	10H			; RESET ROW COUNTER TO 24
  3800                              <1> 
  3801                              <1> 	; 18/11/2020
  3802 000024FB B00A                <1> 	mov	al, 0Ah	; line feed
  3803                              <1> 
  3804 000024FD E80EFEFFFF          <1> 	call	_write_tty_m3
  3805                              <1> 	
  3806 00002502 66BA0018            <1> 	mov	dx, 1800h		; Column = 0, Row = 24
  3807                              <1> P56:	
  3808                              <1> 	; 05/12/2020
  3809                              <1> 	; 18/11/2020
  3810 00002506 5E                  <1> 	pop	esi ; **
  3811                              <1> P54:					; ROW_COLUMNS_SET
  3812                              <1> 	;MOV	AX,0200H		; SET NEW CURSOR POSITION COMMAND
  3813                              <1> 	;INT	10H			; ESTABLISH NEW CURSOR POSITION
  3814                              <1> 
  3815                              <1> 	; 18/11/2020
  3816 00002507 5B                  <1> 	pop	ebx ; ***
  3817 00002508 59                  <1> 	pop	ecx ; ****
  3818                              <1> 
  3819                              <1> 	;LOOP	P50			; DO IT ONCE MORE UNTIL (CX) = ZERO
  3820 00002509 6649                <1> 	dec	cx
  3821 0000250B 7585                <1> 	jnz	short P50next
  3822                              <1> 
  3823 0000250D 665A                <1> 	POP	DX  ; *****		; RESTORE OLD CURSOR COORDINATES
  3824                              <1> 	
  3825 0000250F F605[248E0100]01    <1> 	test	byte [w_str_cmd], 1	; IF CURSOR WAS NOT TO BE MOVED
  3826 00002516 0F853BF6FFFF        <1> 	JNZ	VIDEO_RETURN		; THEN EXIT WITHOUT RESETTING OLD VALUE
  3827                              <1> 	
  3828                              <1> 	;MOV	AX,0200H		; ELSE RESTORE OLD CURSOR POSITION
  3829                              <1> 	;INT	10H
  3830                              <1> 					; DONE - EXIT WRITE STRING
  3831 0000251C E876FEFFFF          <1> 	call	_set_cpos
  3832 00002521 E931F6FFFF          <1> 	JMP	VIDEO_RETURN		; RETURN TO CALLER
  3833                              <1> 
  3834                              <1> vga_write_string:
  3835                              <1> 	; 12/09/2016 - TRDOS 386 (TRDOS v2.0)
  3836                              <1> 	;
  3837                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  3838                              <1> 	; vgabios-0.7a (2011)
  3839                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  3840                              <1> 	; 'vgabios.c', ' biosfn_write_string'
  3841                              <1> 
  3842                              <1> 	; INPUT 								  :
  3843                              <1> 	;	(AL) = WRITE STRING COMMAND  0 - 3				  :
  3844                              <1> 	;	(BH) = DISPLAY PAGE (ACTIVE PAGE)				  :
  3845                              <1> 	;	(CX) = COUNT OF CHARACTERS TO WRITE, IF (CX) = 0 THEN RETURN	  :
  3846                              <1> 	;	(DX) = CURSOR POSITION FOR START OF STRING WRITE		  :
  3847                              <1> 	;	(BL) = ATTRIBUTE OF CHARACTER TO WRITE IF (AL) = 0  OR	(AL) = 1  :
  3848                              <1> 	;	(eBP) = SOURCE STRING OFFSET					  :
  3849                              <1> 	; OUTPUT								  :
  3850                              <1> 	;	NONE								  :
  3851                              <1> 	;-------------------------------------------------------------------------;
  3852                              <1> 
  3853                              <1> 	; AL = 00h: Assign all characters the attribute in BL; do not update cursor
  3854                              <1> 	; AL = 01h: Assign all characters the attribute in BL; update cursor
  3855                              <1> 	; AL = 02h: Use attributes in string; do not update cursor
  3856                              <1> 	; AL = 03h: Use attributes in string; update cursor
  3857                              <1> 	
  3858                              <1> 	; biosfn_write_string(GET_AL(),GET_BH(),GET_BL(),CX,GET_DH(),GET_DL(),ES,BP);
  3859                              <1> 	; static void biosfn_write_string (flag,page,attr,count,row,col,seg,offset) 
  3860                              <1> 
  3861                              <1> 	; // Read curs info for the page
  3862                              <1>  	; biosfn_get_cursor_pos(page,&dummy,&oldcurs);
  3863                              <1> 	; bh = video page = 0
  3864                              <1> 	;movzx	esi, word [CURSOR_POSN] ; current cursor position for video page 0
  3865                              <1> 	
  3866                              <1> 	; // if row=0xff special case : use current cursor position
  3867                              <1> 	; if(row==0xff)
  3868                              <1> 	;  {col=oldcurs&0x00ff;
  3869                              <1> 	;   row=(oldcurs&0xff00)>>8;
  3870                              <1> 	;  }
  3871                              <1> 
  3872                              <1> 	;mov	al, [w_str_cmd]
  3873                              <1> 
  3874 00002526 80FEFF              <1> 	cmp	dh, 0FFh
  3875 00002529 7407                <1> 	je	short vga_wstr_1 ; user current cursor position
  3876                              <1> vga_wstr_0:
  3877                              <1> 	; set cursor position
  3878 0000252B 668915[AE810100]    <1> 	mov	[CURSOR_POSN], dx ; save cursor pos for pg 0
  3879                              <1> vga_wstr_1:
  3880 00002532 66FF35[AE810100]    <1> 	push	word [CURSOR_POSN] ; *
  3881                              <1> 
  3882                              <1> 	; ebp = string offset in system buffer (user buffer was copied to)	
  3883                              <1> 	
  3884                              <1> 	; while(count--!=0)
  3885                              <1> 	;  {
  3886                              <1> 	;   car=read_byte(seg,offset++);
  3887                              <1> 	;   if((flag&0x02)!=0)
  3888                              <1> 	;    attr=read_byte(seg,offset++);
  3889                              <1> 	;    biosfn_write_teletype(car,page,attr,WITH_ATTR);
  3890                              <1> 	;  }
  3891                              <1> 
  3892                              <1> 	;push	eax ; **
  3893                              <1> 	;test	al, 2
  3894 00002539 F605[248E0100]02    <1> 	test	byte [w_str_cmd], 2
  3895 00002540 751D                <1> 	jnz	short vga_wstr_3
  3896 00002542 881D[BF810100]      <1> 	mov	[ccolor], bl
  3897                              <1> vga_wstr_2:
  3898 00002548 51                  <1> 	push	ecx
  3899 00002549 8A4500              <1> 	mov	al, [ebp]
  3900 0000254C E8D90A0000          <1> 	call	vga_write_teletype
  3901 00002551 59                  <1> 	pop	ecx
  3902 00002552 6649                <1> 	dec	cx
  3903 00002554 741E                <1> 	jz	short vga_wstr_4
  3904 00002556 45                  <1> 	inc	ebp
  3905 00002557 8A1D[BF810100]      <1> 	mov	bl, [ccolor]
  3906 0000255D EBE9                <1> 	jmp	short vga_wstr_2
  3907                              <1> vga_wstr_3:
  3908 0000255F 51                  <1> 	push	ecx
  3909 00002560 8A4500              <1> 	mov	al, [ebp]
  3910 00002563 45                  <1> 	inc	ebp
  3911 00002564 8A5D00              <1> 	mov	bl, [ebp]
  3912 00002567 E8BE0A0000          <1> 	call	vga_write_teletype
  3913 0000256C 59                  <1> 	pop	ecx
  3914 0000256D 6649                <1> 	dec	cx
  3915 0000256F 7403                <1> 	jz	short vga_wstr_4
  3916 00002571 45                  <1> 	inc	ebp
  3917 00002572 EBEB                <1> 	jmp	short vga_wstr_3
  3918                              <1> vga_wstr_4:
  3919                              <1> 	; // Set back curs pos 
  3920                              <1> 	; if((flag&0x01)==0)
  3921                              <1> 	;  biosfn_set_cursor_pos(page,oldcurs);
  3922                              <1> 	; }
  3923                              <1> 	;pop	eax ; **
  3924 00002574 665A                <1> 	pop	dx ; word [CURSOR_POSN] ; *
  3925                              <1> 	;test	al, 1
  3926 00002576 F605[248E0100]01    <1> 	test	byte [w_str_cmd], 1
  3927 0000257D 0F85D4F5FFFF        <1> 	jnz	VIDEO_RETURN
  3928 00002583 668915[AE810100]    <1> 	mov 	[CURSOR_POSN], dx
  3929 0000258A E9C8F5FFFF          <1> 	JMP	VIDEO_RETURN
  3930                              <1> 
  3931                              <1> ; 07/07/2016
  3932                              <1> ; 27/06/2016 - TRDOS 386 (TRDOS v2.0)
  3933                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3934                              <1> ;------------------------------------------------------
  3935                              <1> ;  SCROLL UP
  3936                              <1> ;   THIS ROUTINE SCROLLS UP THE INFORMATION ON THE CRT
  3937                              <1> ; ENTRY ---
  3938                              <1> ;  CH,CL = UPPER LEFT CORNER OF REGION TO SCROLL
  3939                              <1> ;  DH,DL = LOWER RIGHT CORNER OF REGION TO SCROLL
  3940                              <1> ;   BOTH OF THE ABOVE ARE IN CHARACTER POSITIONS
  3941                              <1> ;  BH = FILL VALUE FOR BLANKED LINES
  3942                              <1> ;  AL = # LINES TO SCROLL (AL=0 MEANS BLANK THE ENTIRE FIELD)
  3943                              <1> ;  DS = DATA SEGMENT
  3944                              <1> ;  ES = REGEN SEGMENT
  3945                              <1> ; EXIT --
  3946                              <1> ;  NOTHING, THE SCREEN IS SCROLLED
  3947                              <1> ;--------------------------------------------------------
  3948                              <1> 
  3949                              <1> 	; cl = upper left column
  3950                              <1> 	; ch = upper left row
  3951                              <1> 	; dl = lower rigth column
  3952                              <1> 	; dh = lower right row
  3953                              <1> 	;
  3954                              <1> 	; al = line count (AL=0 means blank entire fields)
  3955                              <1> 	; bl = fill value for blanked lines	
  3956                              <1> 	; bh = unused
  3957                              <1> 
  3958                              <1> GRAPHICS_UP:
  3959                              <1> 	; 07/07/2016
  3960                              <1> 	;AH = Current video mode, [CRT_MODE]
  3961 0000258F 80FC07              <1> 	cmp	ah, 7
  3962 00002592 7766                <1> 	ja	short vga_graphics_up
  3963                              <1> 	;je	n0
  3964                              <1> 
  3965 00002594 88C7                <1> 	MOV	bh, al			; save line count in BH
  3966 00002596 6689C8              <1> 	MOV	AX, CX			; GET UPPER LEFT POSITION INTO AX REG
  3967                              <1> 
  3968                              <1> ;-----	USE CHARACTER SUBROUTINE FOR POSITIONING
  3969                              <1> ;-----	ADDRESS RETURNED IS MULTIPLIED BY 2 FROM CORRECT VALUE
  3970                              <1> 
  3971 00002599 E8DA050000          <1> 	CALL	GRAPH_POSN
  3972 0000259E 0FB7F8              <1> 	MOVzx	eDI, AX			; SAVE RESULT AS DESTINATION ADDRESS
  3973                              <1> 
  3974                              <1> ;-----	DETERMINE SIZE OF WINDOW
  3975                              <1> 
  3976 000025A1 6629CA              <1> 	SUB	DX, CX
  3977 000025A4 6681C20101          <1>         ADD     DX, 101h                ; ADJUST VALUES
  3978 000025A9 C0E602              <1> 	SAL	DH, 2			; MULTIPLY ROWS BY 4 AT 8 VERT DOTS/CHAR
  3979                              <1> 					; AND EVEN/ODD ROWS
  3980                              <1> ;-----	DETERMINE CRT MODE
  3981                              <1> 
  3982 000025AC 803D[BA6F0000]06    <1> 	CMP	byte [CRT_MODE], 6	; TEST FOR MEDIUM RES
  3983 000025B3 7305                <1>         JNC     short _R7_              ; FIND_SOURCE
  3984                              <1> 
  3985                              <1> ;-----	MEDIUM RES UP
  3986 000025B5 D0E2                <1> 	SAL	DL, 1			; # COLUMNS * 2, SINCE 2 BYTES/CHAR
  3987 000025B7 66D1E7              <1> 	SAL	DI, 1			; OFFSET *2 SINCE 2 BYTES/CHAR
  3988                              <1> 
  3989                              <1> ;-----	DETERMINE THE SOURCE ADDRESS IN THE BUFFER
  3990                              <1> _R7_:                                   ; FIND_SOURCE
  3991 000025BA 81C700800B00        <1> 	add	edi, 0B8000h
  3992 000025C0 C0E702              <1> 	sal	bh, 2			; multiply number of lines by 4
  3993 000025C3 7431                <1>         JZ      short _R11              ; IF ZERO, THEN BLANK ENTIRE FIELD
  3994 000025C5 B050                <1> 	MOV	AL, 80			; 80 BYTES/ROW
  3995 000025C7 F6E7                <1> 	mul	bh			; determine offset to source
  3996 000025C9 0FB7F0              <1> 	movzx	esi, ax			; offset to source
  3997 000025CC 01FE                <1> 	add	eSI, eDI		; SET UP SOURCE
  3998 000025CE 88F4                <1> 	MOV	AH, DH			; NUMBER OF ROWS IN FIELD
  3999 000025D0 28FC                <1> 	sub	ah, bh			; determine number to move
  4000                              <1> 
  4001                              <1> ;-----	LOOP THROUGH, MOVING ONE ROW AT A TIME, BOTH EVEN AND ODD FIELDS
  4002                              <1> _R8:                                    ; ROW_LOOP
  4003 000025D2 E813040000          <1>         CALL    _R17                    ; MOVE ONE ROW
  4004 000025D7 6681EEB01F          <1> 	SUB	SI, 2000h-80		; MOVE TO NEXT ROW
  4005 000025DC 6681EFB01F          <1> 	SUB	DI, 2000h-80
  4006 000025E1 FECC                <1> 	DEC	AH			; NUMBER OF ROWS TO MOVE
  4007 000025E3 75ED                <1>         JNZ     short _R8               ; CONTINUE TILL ALL MOVED
  4008                              <1> 
  4009                              <1> ;-----	FILL IN THE VACATED LINE(S)
  4010                              <1> _R9:                                    ; CLEAR ENTRY
  4011 000025E5 88D8                <1> 	mov	al, bl			; attribute to fill with
  4012                              <1> _R10_:
  4013 000025E7 E81A040000          <1>         CALL    _R18                    ; CLEAR THAT ROW
  4014 000025EC 6681EFB01F          <1> 	SUB	DI, 2000h-80		; POINT TO NEXT LINE
  4015 000025F1 FECF                <1> 	dec	bh			; number of lines to fill
  4016 000025F3 75F2                <1>         JNZ     short _R10_             ; CLEAR LOOP
  4017 000025F5 C3                  <1> 	retn				; EVERYYHING DONE
  4018                              <1> 
  4019                              <1> _R11:                                   ; BLANK_FIELD
  4020 000025F6 88F7                <1> 	mov	bh, dh			; set blank count to everything in field
  4021 000025F8 EBEB                <1>         JMP     short _R9               ; CLEAR THE FIELD
  4022                              <1> 
  4023                              <1> vga_graphics_up:
  4024                              <1> 	; 08/08/2016
  4025                              <1> 	; 07/08/2016
  4026                              <1> 	; 04/08/2016
  4027                              <1> 	; 01/08/2016
  4028                              <1> 	; 31/07/2016
  4029                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  4030                              <1> 	;
  4031                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4032                              <1> 	; vgabios-0.7a (2011)
  4033                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4034                              <1> 	; 'vgabios.c', 'biosfn_scroll'
  4035                              <1> 	;
  4036                              <1> 
  4037                              <1> 	; cl = upper left column
  4038                              <1> 	; ch = upper left row
  4039                              <1> 	; dl = lower rigth column
  4040                              <1> 	; dh = lower right row
  4041                              <1> 	;
  4042                              <1> 	; al = line count (AL=0 means blank entire fields)
  4043                              <1> 	; bl = fill value for blanked lines	
  4044                              <1> 	; bh = unused
  4045                              <1> 	;
  4046                              <1> 	; ah = [CRT_MODE], current video mode	
  4047                              <1> 
  4048 000025FA 88C7                <1> 	mov	bh, al ; 31/07/2016
  4049 000025FC BE[DE6F0000]        <1> 	mov	esi, vga_g_modes
  4050 00002601 89F7                <1> 	mov	edi, esi
  4051 00002603 83C708              <1> 	add	edi, vga_g_mode_count
  4052                              <1> vga_g_up_0:
  4053 00002606 AC                  <1> 	lodsb
  4054 00002607 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4055 00002609 7405                <1> 	je	short vga_g_up_1
  4056 0000260B 39FE                <1> 	cmp	esi, edi
  4057 0000260D 72F7                <1> 	jb	short vga_g_up_0
  4058                              <1> 	;xor	bh, bh ; 31/07/2016)
  4059 0000260F C3                  <1> 	retn	; nothing to do
  4060                              <1> vga_g_up_1:
  4061 00002610 88F8                <1> 	mov	al, bh ; 31/07/2016
  4062 00002612 83C64F              <1> 	add	esi, vga_g_memmodel - (vga_g_modes + 1)  
  4063                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4064                              <1> 	
  4065                              <1> 	; if(rlr>=nbrows)rlr=nbrows-1;
  4066                              <1>  	; if(clr>=nbcols)clr=nbcols-1;
  4067                              <1>  	; if(nblines>nbrows)nblines=0;
  4068                              <1>  	; cols=clr-cul+1;
  4069                              <1> 
  4070 00002615 3A35[C26F0000]      <1> 	cmp	dh, [VGA_ROWS]
  4071 0000261B 7208                <1> 	jb	short vga_g_up_2
  4072 0000261D 8A35[C26F0000]      <1> 	mov	dh, [VGA_ROWS]
  4073 00002623 FECE                <1> 	dec	dh
  4074                              <1> vga_g_up_2:
  4075 00002625 3A15[BC6F0000]      <1> 	cmp	dl, [CRT_COLS]  ; = [VGA_COLS]
  4076 0000262B 7208                <1> 	jb	short vga_g_up_3
  4077 0000262D 8A15[BC6F0000]      <1> 	mov	dl, [CRT_COLS]
  4078 00002633 FECA                <1> 	dec	dl
  4079                              <1> vga_g_up_3:	
  4080 00002635 3A05[C26F0000]      <1> 	cmp	al, [VGA_ROWS]
  4081 0000263B 7602                <1> 	jna	short vga_g_up_4
  4082 0000263D 28C0                <1> 	sub	al, al ; 0
  4083                              <1> vga_g_up_4:
  4084 0000263F 88D7                <1> 	mov	bh, dl ; clr
  4085 00002641 28CF                <1> 	sub	bh, cl ; cul
  4086 00002643 FEC7                <1> 	inc	bh ; cols = clr-cul+1
  4087                              <1> 
  4088 00002645 20C0                <1> 	and	al, al ; nblines = 0
  4089 00002647 755D                <1> 	jnz	short vga_g_up_6
  4090 00002649 20ED                <1> 	and	ch, ch ; rul = 0
  4091 0000264B 7559                <1> 	jnz	short vga_g_up_6
  4092 0000264D 20C9                <1> 	and	cl, cl ; cul = 0
  4093 0000264F 7555                <1> 	jnz	short vga_g_up_6
  4094                              <1> 
  4095 00002651 6650                <1> 	push	ax
  4096 00002653 A0[C26F0000]        <1> 	mov	al, [VGA_ROWS]
  4097 00002658 FEC8                <1> 	dec	al  
  4098 0000265A 38C6                <1> 	cmp	dh, al ; rlr = nbrows-1
  4099 0000265C 7546                <1> 	jne	short vga_g_up_5
  4100 0000265E A0[BC6F0000]        <1>         mov     al, [CRT_COLS]  ; = VGA_COLS
  4101 00002663 FEC8                <1> 	dec	al 
  4102 00002665 38C2                <1>  	cmp	dl, al ; clr = nbcols-1
  4103 00002667 753B                <1> 	jne	short vga_g_up_5
  4104 00002669 6658                <1> 	pop	ax
  4105                              <1> 
  4106 0000266B 66B80502            <1> 	mov	ax, 0205h
  4107 0000266F 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4108 00002673 66EF                <1> 	out	dx, ax
  4109 00002675 A0[C26F0000]        <1> 	mov	al, [VGA_ROWS]
  4110 0000267A 8A25[BC6F0000]      <1> 	mov	ah, [CRT_COLS] ; = [VGA_COLS]
  4111 00002680 F6E4                <1> 	mul	ah
  4112 00002682 0FB7D0              <1> 	movzx	edx, ax
  4113                              <1> 	; 08/08/2016
  4114 00002685 0FB605[BE6F0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  4115 0000268C F7E2                <1> 	mul	edx
  4116                              <1> 	; eax = byte count	
  4117 0000268E 89C1                <1> 	mov	ecx, eax
  4118                              <1> 	;; 07/08/2016
  4119                              <1> 	;shl	dx, 3 ; * 8 ; * [CHAR_HEIGHT]
  4120                              <1> 	;mov	ecx, edx
  4121 00002690 88D8                <1> 	mov	al, bl ; fill value for blanked lines
  4122 00002692 BF00000A00          <1> 	mov	edi, 0A0000h
  4123 00002697 F3AA                <1> 	rep	stosb		
  4124                              <1> 	
  4125 00002699 66B80500            <1> 	mov	ax, 5
  4126 0000269D 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4127 000026A1 66EF                <1> 	out	dx, ax ; 0005h	
  4128                              <1> 
  4129 000026A3 C3                  <1> 	retn
  4130                              <1> 
  4131                              <1> vga_g_up_5:
  4132 000026A4 6658                <1> 	pop	ax
  4133                              <1> 
  4134                              <1> vga_g_up_6:
  4135                              <1> 	; [ESI] = VGA memory model number for current video mode
  4136                              <1>         ;
  4137                              <1>         ; LINEAR8 equ 5
  4138                              <1>         ; PLANAR4 equ 4
  4139                              <1>         ; PLANAR1 equ 3
  4140                              <1> 
  4141 000026A6 803E04              <1> 	cmp	byte [esi], PLANAR4
  4142 000026A9 7424                <1> 	je	short vga_g_up_planar
  4143 000026AB 803E03              <1> 	cmp	byte [esi], PLANAR1
  4144 000026AE 741F                <1> 	je	short vga_g_up_planar
  4145                              <1> vga_g_up_linear8:
  4146                              <1> 	; 07/07/2016 (TEMPORARY)
  4147                              <1> 	;
  4148                              <1> 	; cl = upper left column ; cul
  4149                              <1> 	; ch = upper left row ; rul
  4150                              <1> 	; dl = lower rigth column ; clr
  4151                              <1> 	; dh = lower right row ; rlr
  4152                              <1> 
  4153                              <1> vga_g_up_l0:
  4154                              <1>  	;{for(i=rul;i<=rlr;i++)
  4155                              <1>   	; if((i+nblines>rlr)||(nblines==0))
  4156 000026B0 08C0                <1> 	or	al, al
  4157 000026B2 7414                <1> 	jz	short vga_g_up_l2
  4158 000026B4 88C4                <1> 	mov	ah, al
  4159 000026B6 00EC                <1> 	add	ah, ch ; i+nblines
  4160                              <1> 	;jc	short vga_g_up_l2	
  4161 000026B8 38F4                <1> 	cmp	ah, dh
  4162 000026BA 770C                <1> 	ja	short vga_g_up_l2
  4163                              <1> 	; else
  4164                              <1> 	;  vgamem_copy_pl4(cul,i+nblines,i,cols,nbcols,cheight);
  4165 000026BC E8F2000000          <1> 	call	vgamem_copy_l8
  4166                              <1> vga_g_up_l1:
  4167 000026C1 FEC5                <1> 	inc	ch
  4168 000026C3 38F5                <1> 	cmp	ch, dh
  4169 000026C5 76E9                <1> 	jna	short vga_g_up_l0
  4170 000026C7 C3                  <1> 	retn
  4171                              <1> vga_g_up_l2:
  4172                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  4173 000026C8 E850010000          <1> 	call	vgamem_fill_l8
  4174 000026CD EBF2                <1> 	jmp	short vga_g_up_l1
  4175                              <1> 
  4176                              <1> vga_g_up_planar:
  4177                              <1> 	; cl = upper left column ; cul
  4178                              <1> 	; ch = upper left row ; rul
  4179                              <1> 	; dl = lower rigth column ; clr
  4180                              <1> 	; dh = lower right row ; rlr
  4181                              <1> vga_g_up_pl0:
  4182                              <1>  	;{for(i=rul;i<=rlr;i++)
  4183                              <1>   	; if((i+nblines>rlr)||(nblines==0))
  4184 000026CF 20C0                <1> 	and	al, al
  4185 000026D1 7414                <1> 	jz	short vga_g_up_pl2	
  4186 000026D3 88C4                <1> 	mov	ah, al
  4187 000026D5 00EC                <1> 	add	ah, ch ; i+nblines
  4188                              <1> 	;jc	short vga_g_up_pl2
  4189 000026D7 38F4                <1> 	cmp	ah, dh
  4190 000026D9 770C                <1> 	ja	short vga_g_up_pl2
  4191                              <1> 	; else
  4192                              <1> 	;  vgamem_copy_pl4(cul,i+nblines,i,cols,nbcols,cheight);
  4193 000026DB E80E000000          <1> 	call	vgamem_copy_pl4
  4194                              <1> vga_g_up_pl1:
  4195 000026E0 FEC5                <1> 	inc	ch 
  4196 000026E2 38F5                <1> 	cmp	ch, dh
  4197 000026E4 76E9                <1> 	jna	short vga_g_up_pl0
  4198 000026E6 C3                  <1> 	retn
  4199                              <1> vga_g_up_pl2:
  4200                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  4201 000026E7 E870000000          <1> 	call	vgamem_fill_pl4
  4202 000026EC EBF2                <1> 	jmp	short vga_g_up_pl1
  4203                              <1> 
  4204                              <1> vgamem_copy_pl4:
  4205                              <1> 	; 08/08/2016
  4206                              <1> 	; 07/08/2016
  4207                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  4208                              <1> 	;
  4209                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4210                              <1> 	; vgabios-0.7a (2011)
  4211                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4212                              <1> 	; 'vgabios.c', 'vgamem_copy_pl4'
  4213                              <1> 	;
  4214                              <1> 	; vgamem_copy_pl4(xstart,ysrc,ydest,cols,nbcols,cheight)
  4215                              <1> 	; cl = xstart, ah = ysrc (i+nblines), ch = ydest (i),
  4216                              <1> 	; bh = cols, [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  4217                              <1> 
  4218                              <1> 	; src=ysrc*cheight*nbcols+xstart;
  4219                              <1> 	; dest=ydest*cheight*nbcols+xstart;
  4220                              <1> 
  4221 000026EE 52                  <1> 	push	edx
  4222 000026EF 50                  <1> 	push	eax
  4223                              <1> 
  4224                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0105)
  4225 000026F0 66B80501            <1> 	mov	ax, 0105h
  4226 000026F4 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4227 000026F8 66EF                <1> 	out	dx, ax
  4228                              <1> 
  4229                              <1> 	; 07/08/2016
  4230                              <1>  	;mov     ah, [esp+1]
  4231                              <1> 	;movzx	edx, ah ; ysrc
  4232 000026FA 0FB6542401          <1> 	movzx	edx, byte [esp+1]
  4233                              <1> 	; 08/08/2016
  4234 000026FF 0FB605[BE6F0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  4235 00002706 8A25[BC6F0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  4236 0000270C F6E4                <1> 	mul	ah 
  4237                              <1> 	;; 07/08/2016
  4238                              <1> 	;movzx	eax, byte [CRT_COLS]
  4239                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  4240 0000270E 50                  <1> 	push	eax ; cheight * nbcols
  4241 0000270F F7E2                <1> 	mul	edx ; * ysrc
  4242                              <1> 	; eax = ysrc * cheight * nbcols
  4243                              <1> 	; edx = 0
  4244 00002711 88CA                <1> 	mov	dl, cl ; edx = xstart	
  4245 00002713 01D0                <1>  	add	eax, edx
  4246 00002715 89C6                <1> 	mov	esi, eax ; src
  4247 00002717 88EA                <1> 	mov	dl, ch ; ydest
  4248 00002719 58                  <1> 	pop	eax ; cheight * nbcols
  4249 0000271A F7E2                <1> 	mul	edx
  4250                              <1> 	; eax = ydest * cheight * nbcols
  4251 0000271C 88CA                <1> 	mov	dl, cl ; edx = xstart	
  4252 0000271E 01D0                <1>  	add	eax, edx
  4253 00002720 89C7                <1> 	mov	edi, eax ; dest
  4254                              <1> 	; esi = src
  4255                              <1> 	; edi = dest
  4256                              <1> 	; for(i=0;i<cheight;i++)
  4257                              <1>   	; {
  4258                              <1>    	;  memcpyb(0xa000,dest+i*nbcols,0xa000,src+i*nbcols,cols);
  4259                              <1>   	; }
  4260 00002722 51                  <1> 	push	ecx
  4261 00002723 B900000A00          <1> 	mov	ecx, 0A0000h
  4262 00002728 01CE                <1> 	add	esi, ecx
  4263 0000272A 01CF                <1> 	add	edi, ecx
  4264                              <1> 	; 08/08/2016
  4265 0000272C 8A35[BE6F0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  4266                              <1> 	;; 07/08/2016
  4267                              <1> 	;mov	dh, 8 ; 07/08/2016
  4268 00002732 28D2                <1> 	sub	dl, dl ; i
  4269                              <1> vgamem_copy_pl4_0:
  4270 00002734 56                  <1> 	push	esi
  4271 00002735 57                  <1> 	push	edi
  4272 00002736 0FB605[BC6F0000]    <1> 	movzx	eax, byte [CRT_COLS]
  4273 0000273D F6E2                <1> 	mul	dl
  4274                              <1> 	; eax = i * nbcols
  4275 0000273F 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  4276 00002741 01C6                <1> 	add	esi, eax
  4277 00002743 0FB6CF              <1> 	movzx	ecx, bh ; cols
  4278 00002746 F3A4                <1> 	rep	movsb
  4279 00002748 5F                  <1> 	pop	edi
  4280 00002749 5E                  <1> 	pop	esi
  4281 0000274A FECE                <1> 	dec	dh
  4282 0000274C 75E6                <1> 	jnz	short vgamem_copy_pl4_0
  4283                              <1> vgamem_copy_pl4_1:
  4284 0000274E 59                  <1> 	pop	ecx
  4285                              <1> 
  4286                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  4287 0000274F 66B80500            <1> 	mov	ax, 0005h
  4288 00002753 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4289 00002757 66EF                <1> 	out	dx, ax
  4290                              <1> 
  4291 00002759 58                  <1> 	pop	eax
  4292 0000275A 5A                  <1> 	pop	edx
  4293                              <1> 
  4294 0000275B C3                  <1> 	retn	
  4295                              <1> 
  4296                              <1> vgamem_fill_pl4:
  4297                              <1> 	; 08/08/2016
  4298                              <1> 	; 07/08/2016
  4299                              <1> 	; 04/08/2016
  4300                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  4301                              <1> 	;
  4302                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4303                              <1> 	; vgabios-0.7a (2011)
  4304                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4305                              <1> 	; 'vgabios.c', 'vgamem_fill_pl4'
  4306                              <1> 	;
  4307                              <1> 	; vgamem_fill_pl4(xstart,ystart,cols,nbcols,cheight,attr)
  4308                              <1> 	; cl = xstart, edi = ch = ystart, bh = cols,
  4309                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight, attr = 0
  4310                              <1> 
  4311                              <1> 	; dest=ystart*cheight*nbcols+xstart;
  4312 0000275C 52                  <1> 	push	edx
  4313 0000275D 50                  <1> 	push	eax
  4314                              <1> 
  4315                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205)
  4316 0000275E 66B80502            <1> 	mov	ax, 0205h
  4317 00002762 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4318 00002766 66EF                <1> 	out	dx, ax
  4319                              <1> 
  4320                              <1>       	; 08/08/2016
  4321 00002768 0FB605[BE6F0000]    <1> 	movzx   eax, byte [CHAR_HEIGHT]
  4322 0000276F F6E5                <1> 	mul	ch
  4323                              <1> 	;; 07/08/2016
  4324                              <1> 	;movzx	eax, ch
  4325                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  4326 00002771 0FB615[BC6F0000]    <1> 	movzx	edx, byte [CRT_COLS] ; = [VGA_COLS]
  4327 00002778 F7E2                <1> 	mul	edx
  4328                              <1> 	; edx  = 0
  4329 0000277A 88CA                <1> 	mov	dl, cl 
  4330 0000277C 01D0                <1> 	add	eax, edx
  4331 0000277E 89C7                <1> 	mov	edi, eax
  4332                              <1> 	; edi = dest
  4333                              <1> 	; for(i=0;i<cheight;i++)
  4334                              <1>   	; {
  4335                              <1>    	;  memsetb(0xa000,dest+i*nbcols,attr,cols);
  4336                              <1>   	; }
  4337 00002780 81C700000A00        <1> 	add	edi, 0A0000h
  4338 00002786 51                  <1> 	push	ecx
  4339                              <1> 	; 08/08/2016
  4340 00002787 8A35[BE6F0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  4341                              <1> 	;; 07/08/2016
  4342                              <1> 	;mov	dh, 8 ; 07/08/2016
  4343 0000278D 28D2                <1> 	sub	dl, dl ; i
  4344                              <1> vgamem_fill_pl4_0:
  4345 0000278F 57                  <1> 	push	edi
  4346 00002790 0FB605[BC6F0000]    <1> 	movzx	eax, byte [CRT_COLS]
  4347 00002797 F6E2                <1> 	mul	dl
  4348                              <1> 	; eax = i * nbcols
  4349 00002799 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  4350 0000279B 88D8                <1> 	mov	al, bl ; attr ; 04/08/2016
  4351 0000279D 0FB6CF              <1> 	movzx	ecx, bh ; cols
  4352 000027A0 F3AA                <1>  	rep	stosb
  4353 000027A2 5F                  <1> 	pop	edi
  4354 000027A3 75EA                <1> 	jnz	short vgamem_fill_pl4_0
  4355                              <1> vgamem_fill_pl4_1:
  4356 000027A5 59                  <1> 	pop	ecx
  4357                              <1> 
  4358                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  4359 000027A6 66B80500            <1> 	mov	ax, 0005h
  4360 000027AA 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4361 000027AE 66EF                <1> 	out	dx, ax
  4362                              <1> 
  4363 000027B0 58                  <1> 	pop	eax
  4364 000027B1 5A                  <1> 	pop	edx 
  4365                              <1> 	
  4366 000027B2 C3                  <1> 	retn
  4367                              <1> 
  4368                              <1> vgamem_copy_l8:
  4369                              <1> 	; 08/08/2016
  4370                              <1> 	; 07/08/2016
  4371                              <1> 	; 06/08/2016
  4372                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  4373                              <1> 	;
  4374                              <1> 	; TEMPORARY
  4375                              <1> 	;
  4376                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4377                              <1> 	; vgabios-0.7a (2011)
  4378                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4379                              <1> 	; 'vgabios.c', 'vgamem_copy_pl4'
  4380                              <1> 	;
  4381                              <1> 	; vgamem_copy_pl4(xstart,ysrc,ydest,cols,nbcols,cheight)
  4382                              <1> 	; cl = xstart, ah = ysrc (i+nblines), ch = ydest (i),
  4383                              <1> 	; bh = cols, [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  4384                              <1> 
  4385                              <1> 	; src=ysrc*cheight*nbcols+xstart;
  4386                              <1> 	; dest=ydest*cheight*nbcols+xstart;
  4387                              <1> 
  4388 000027B3 52                  <1> 	push	edx
  4389 000027B4 50                  <1> 	push	eax
  4390                              <1> 
  4391                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0105)
  4392                              <1> 	;mov	ax, 0105h
  4393                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4394                              <1> 	;out	dx, ax
  4395                              <1> 
  4396                              <1> 	;mov	ah, [esp+1]
  4397                              <1> 
  4398 000027B5 0FB6D4              <1> 	movzx	edx, ah ; ysrc
  4399                              <1> 	; 08/08/2016
  4400 000027B8 0FB605[BE6F0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  4401 000027BF 8A25[BC6F0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  4402 000027C5 F6E4                <1> 	mul	ah 
  4403                              <1> 	;; 07/08/2016
  4404                              <1> 	;movzx	eax, byte [CRT_COLS]
  4405                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  4406 000027C7 50                  <1> 	push	eax ; cheight * nbcols
  4407 000027C8 F7E2                <1> 	mul	edx ; * ysrc
  4408                              <1> 	; eax = ysrc * cheight * nbcols
  4409                              <1> 	; edx = 0
  4410 000027CA 88CA                <1> 	mov	dl, cl ; edx = xstart
  4411 000027CC 01D0                <1>  	add	eax, edx
  4412 000027CE 89C6                <1> 	mov	esi, eax ; src
  4413 000027D0 66C1E603            <1> 	shl	si, 3 ; * 8 ; 06/08/2016
  4414 000027D4 88EA                <1> 	mov	dl, ch ; ydest
  4415 000027D6 58                  <1> 	pop	eax ; cheight * nbcols
  4416 000027D7 F7E2                <1> 	mul	edx
  4417                              <1> 	; eax = ydest * cheight * nbcols
  4418 000027D9 88CA                <1> 	mov	dl, cl ; edx = xstart	
  4419 000027DB 01D0                <1>  	add	eax, edx
  4420 000027DD 89C7                <1> 	mov	edi, eax ; dest
  4421 000027DF 66C1E703            <1> 	shl	di, 3 ; * 8 ; 06/08/2016
  4422                              <1> 	; esi = src
  4423                              <1> 	; edi = dest
  4424                              <1> 	; for(i=0;i<cheight;i++)
  4425                              <1>   	; {
  4426                              <1>    	;  memcpyb(0xa000,dest+i*nbcols,0xa000,src+i*nbcols,cols);
  4427                              <1>   	; }
  4428 000027E3 51                  <1> 	push	ecx
  4429 000027E4 B900000A00          <1> 	mov	ecx, 0A0000h
  4430 000027E9 01CE                <1> 	add	esi, ecx
  4431 000027EB 01CF                <1> 	add	edi, ecx
  4432                              <1> 	; 08/08/2016
  4433 000027ED 8A35[BE6F0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  4434                              <1> 	;; 07/08/2016
  4435                              <1> 	;mov	dh, 8 ; 07/08/2016
  4436 000027F3 28D2                <1> 	sub	dl, dl ; i
  4437                              <1> vgamem_copy_l8_0:
  4438 000027F5 56                  <1> 	push	esi
  4439 000027F6 57                  <1> 	push	edi
  4440 000027F7 0FB605[BC6F0000]    <1> 	movzx	eax, byte [CRT_COLS]
  4441 000027FE F6E2                <1> 	mul	dl
  4442                              <1> 	; eax = i * nbcols
  4443 00002800 66C1E003            <1> 	shl	ax, 3 ; * 8 ; 06/08/2016
  4444 00002804 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  4445 00002806 01C6                <1> 	add	esi, eax
  4446 00002808 0FB6CF              <1> 	movzx	ecx, bh ; cols
  4447 0000280B 66C1E103            <1> 	shl	cx, 3 ; * 8 ; 06/08/2016
  4448 0000280F F3A4                <1> 	rep	movsb
  4449 00002811 5F                  <1> 	pop	edi
  4450 00002812 5E                  <1> 	pop	esi
  4451 00002813 FEC2                <1> 	inc	dl ; 06/08/2016
  4452 00002815 FECE                <1> 	dec	dh
  4453 00002817 75DC                <1> 	jnz	short vgamem_copy_l8_0
  4454                              <1> vgamem_copy_l8_1:
  4455 00002819 59                  <1> 	pop	ecx
  4456                              <1> 
  4457                              <1> 	;; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  4458                              <1> 	;mov	ax, 0005h
  4459                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4460                              <1> 	;out	dx, ax
  4461                              <1> 
  4462 0000281A 58                  <1> 	pop	eax
  4463 0000281B 5A                  <1> 	pop	edx
  4464                              <1> 
  4465 0000281C C3                  <1> 	retn
  4466                              <1> 
  4467                              <1> vgamem_fill_l8:
  4468                              <1> 	; 08/08/2016
  4469                              <1> 	; 07/08/2016
  4470                              <1> 	; 06/08/2016
  4471                              <1> 	; 04/08/2016
  4472                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  4473                              <1> 	;
  4474                              <1> 	; TEMPORARY
  4475                              <1> 	;
  4476                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4477                              <1> 	; vgabios-0.7a (2011)
  4478                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4479                              <1> 	; 'vgabios.c', 'vgamem_fill_pl4'
  4480                              <1> 	;
  4481                              <1> 	; vgamem_fill_pl4(xstart,ystart,cols,nbcols,cheight,attr)
  4482                              <1> 	; cl = xstart, edi = ch = ystart, bh = cols,
  4483                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight, attr = 0
  4484                              <1> 
  4485                              <1> 	; dest=ystart*cheight*nbcols+xstart;
  4486 0000281D 52                  <1> 	push	edx
  4487 0000281E 50                  <1> 	push	eax
  4488                              <1> 
  4489                              <1> 	;; outw(VGAREG_GRDC_ADDRESS, 0x0205)
  4490                              <1> 	;mov	ax, 0205h
  4491                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4492                              <1> 	;out	dx, ax
  4493                              <1> 
  4494                              <1>         ; 08/08/2016
  4495 0000281F 0FB605[BE6F0000]    <1> 	movzx   eax, byte [CHAR_HEIGHT]
  4496 00002826 F6E5                <1> 	mul	ch
  4497                              <1> 	;; 07/08/2016
  4498                              <1> 	;movzx	eax, ch
  4499                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  4500 00002828 0FB615[BC6F0000]    <1> 	movzx	edx, byte [CRT_COLS] ; = [VGA_COLS]
  4501 0000282F F7E2                <1> 	mul	edx
  4502                              <1> 	; edx  = 0
  4503 00002831 88CA                <1> 	mov	dl, cl 
  4504 00002833 01D0                <1> 	add	eax, edx
  4505 00002835 89C7                <1> 	mov	edi, eax
  4506 00002837 66C1E703            <1> 	shl	di, 3 ; * 8 ; 06/08/2016
  4507                              <1> 	; edi = dest
  4508                              <1> 	; for(i=0;i<cheight;i++)
  4509                              <1>   	; {
  4510                              <1>    	;  memsetb(0xa000,dest+i*nbcols,attr,cols);
  4511                              <1>   	; }
  4512 0000283B 81C700000A00        <1> 	add	edi, 0A0000h
  4513 00002841 51                  <1> 	push	ecx
  4514                              <1> 	; 08/08/2016
  4515 00002842 8A35[BE6F0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  4516                              <1> 	;; 07/08/2016
  4517                              <1> 	;mov	dh, 8 ; 07/08/2016
  4518 00002848 28D2                <1> 	sub	dl, dl ; i
  4519                              <1> vgamem_fill_l8_0:
  4520 0000284A 57                  <1> 	push	edi
  4521 0000284B 0FB605[BC6F0000]    <1> 	movzx	eax, byte [CRT_COLS]
  4522 00002852 F6E2                <1> 	mul	dl
  4523                              <1> 	; eax = i * nbcols
  4524 00002854 66C1E003            <1> 	shl	ax, 3 ; * 8 ; 06/08/2016
  4525 00002858 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  4526 0000285A 88D8                <1> 	mov	al, bl ; attr ; 04/08/2016
  4527 0000285C 0FB6CF              <1> 	movzx	ecx, bh ; cols
  4528 0000285F 66C1E103            <1> 	shl	cx, 3 ; * 8 ; 06/08/2016
  4529 00002863 F3AA                <1>  	rep	stosb
  4530 00002865 5F                  <1> 	pop	edi
  4531 00002866 FEC2                <1> 	inc	dl ; 06/08/2016
  4532 00002868 FECE                <1> 	dec	dh
  4533 0000286A 75DE                <1> 	jnz	short vgamem_fill_l8_0
  4534                              <1> vgamem_fill_l8_1:
  4535 0000286C 59                  <1> 	pop	ecx
  4536                              <1> 
  4537                              <1> 	;; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  4538                              <1> 	;mov	ax, 0005h
  4539                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4540                              <1> 	;out	dx, ax
  4541                              <1> 
  4542 0000286D 58                  <1> 	pop	eax
  4543 0000286E 5A                  <1> 	pop	edx 
  4544                              <1> 
  4545 0000286F C3                  <1> 	retn
  4546                              <1> 
  4547                              <1> vga_graphics_down:
  4548                              <1> 	; 08/08/2016
  4549                              <1> 	; 07/08/2016
  4550                              <1> 	; 31/07/2016
  4551                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  4552                              <1> 	;
  4553                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4554                              <1> 	; vgabios-0.7a (2011)
  4555                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4556                              <1> 	; 'vgabios.c', 'biosfn_scroll'
  4557                              <1> 	;
  4558                              <1> 
  4559                              <1> 	; cl = upper left column
  4560                              <1> 	; ch = upper left row
  4561                              <1> 	; dl = lower rigth column
  4562                              <1> 	; dh = lower right row
  4563                              <1> 	;
  4564                              <1> 	; al = line count (AL=0 means blank entire fields)
  4565                              <1> 	; bl = fill value for blanked lines	
  4566                              <1> 	; bh = unused
  4567                              <1> 	;
  4568                              <1> 	; ah = [CRT_MODE], current video mode	
  4569                              <1> 
  4570 00002870 FC                  <1>         cld     ; !!! Clear direction flag !!! 
  4571                              <1> 
  4572 00002871 88C7                <1> 	mov	bh, al ; 31/07/2016
  4573                              <1> 
  4574 00002873 BE[D66F0000]        <1> 	mov	esi, vga_modes
  4575 00002878 89F7                <1> 	mov	edi, esi
  4576 0000287A 83C710              <1> 	add	edi, vga_mode_count
  4577                              <1> vga_g_down_0:
  4578 0000287D AC                  <1> 	lodsb
  4579 0000287E 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4580 00002880 7405                <1> 	je	short vga_g_down_1
  4581 00002882 39FE                <1> 	cmp	esi, edi
  4582 00002884 72F7                <1> 	jb	short vga_g_down_0
  4583                              <1> 	; xor 	bh, bh	; 31/07/2016
  4584 00002886 C3                  <1> 	retn	; nothing to do
  4585                              <1> vga_g_down_1:
  4586 00002887 88F8                <1> 	mov	al, bh ; 31/07/2016
  4587 00002889 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  4588                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4589                              <1> 	
  4590                              <1> 	; if(rlr>=nbrows)rlr=nbrows-1;
  4591                              <1>  	; if(clr>=nbcols)clr=nbcols-1;
  4592                              <1>  	; if(nblines>nbrows)nblines=0;
  4593                              <1>  	; cols=clr-cul+1;
  4594                              <1> 
  4595 0000288C 3A35[C26F0000]      <1> 	cmp	dh, [VGA_ROWS]
  4596 00002892 7208                <1> 	jb	short vga_g_down_2
  4597 00002894 8A35[C26F0000]      <1> 	mov	dh, [VGA_ROWS]
  4598 0000289A FECE                <1> 	dec	dh
  4599                              <1> vga_g_down_2:
  4600 0000289C 3A15[BC6F0000]      <1> 	cmp	dl, [CRT_COLS]  ; = [VGA_COLS]
  4601 000028A2 7208                <1> 	jb	short vga_g_down_3
  4602 000028A4 8A15[BC6F0000]      <1> 	mov	dl, [CRT_COLS]
  4603 000028AA FECA                <1> 	dec	dl
  4604                              <1> vga_g_down_3:	
  4605 000028AC 3A05[C26F0000]      <1> 	cmp	al, [VGA_ROWS]
  4606 000028B2 7602                <1> 	jna	short vga_g_down_4
  4607 000028B4 28C0                <1> 	sub	al, al ; 0
  4608                              <1> vga_g_down_4:
  4609 000028B6 88F7                <1> 	mov	bh, dh ; clr
  4610 000028B8 28CF                <1> 	sub	bh, cl ; cul
  4611 000028BA FEC7                <1> 	inc	bh ; cols = clr-cul+1
  4612                              <1> 
  4613 000028BC 20C0                <1> 	and	al, al ; nblines = 0
  4614 000028BE 755B                <1> 	jnz	short vga_g_down_6
  4615 000028C0 20ED                <1> 	and	ch, ch ; rul = 0
  4616 000028C2 7557                <1> 	jnz	short vga_g_down_6
  4617 000028C4 20C9                <1> 	and	cl, cl ; cul = 0
  4618 000028C6 7553                <1> 	jnz	short vga_g_down_6
  4619                              <1> 
  4620 000028C8 6650                <1> 	push	ax
  4621 000028CA A0[C26F0000]        <1> 	mov	al, [VGA_ROWS]
  4622 000028CF FEC8                <1> 	dec	al  
  4623 000028D1 38C6                <1> 	cmp	dh, al ; rlr = nbrows-1
  4624 000028D3 7544                <1> 	jne	short vga_g_down_5
  4625 000028D5 A0[BC6F0000]        <1>         mov     al, [CRT_COLS]  ; = VGA_COLS
  4626 000028DA FEC8                <1> 	dec	al 
  4627 000028DC 38C2                <1>  	cmp	dl, al ; clr = nbcols-1
  4628 000028DE 7539                <1> 	jne	short vga_g_down_5
  4629 000028E0 6658                <1> 	pop	ax
  4630                              <1> 
  4631 000028E2 66B80502            <1> 	mov	ax, 0205h
  4632 000028E6 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4633 000028EA 66EF                <1> 	out	dx, ax
  4634 000028EC A0[C26F0000]        <1> 	mov	al, [VGA_ROWS]
  4635 000028F1 8A25[BC6F0000]      <1> 	mov	ah, [CRT_COLS] ; = [VGA_COLS]
  4636 000028F7 F6E4                <1> 	mul	ah
  4637 000028F9 0FB7D0              <1> 	movzx	edx, ax
  4638                              <1> 	; 08/08/2016
  4639 000028FC 0FB605[BE6F0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  4640 00002903 F7E2                <1> 	mul	edx
  4641                              <1> 	; eax = byte count	
  4642 00002905 89C1                <1> 	mov	ecx, eax
  4643                              <1> 	;; 07/08/2016
  4644                              <1> 	;shl	dx, 3 ; * 8 ; * [CHAR_HEIGHT]
  4645                              <1> 	;mov	ecx, edx
  4646 00002907 88D8                <1> 	mov	al, bl ; fill value for blanked lines
  4647 00002909 BF00000A00          <1> 	mov	edi, 0A0000h
  4648 0000290E F3AA                <1> 	rep	stosb			
  4649                              <1> 	
  4650 00002910 B005                <1> 	mov	al, 5
  4651 00002912 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4652 00002916 66EF                <1> 	out	dx, ax ; 0005h	
  4653                              <1> 
  4654 00002918 C3                  <1> 	retn
  4655                              <1> 
  4656                              <1> vga_g_down_5:
  4657 00002919 6658                <1> 	pop	ax
  4658                              <1> 
  4659                              <1> vga_g_down_6:
  4660                              <1> 	; [ESI] = VGA memory model number for current video mode
  4661                              <1>         ;
  4662                              <1>         ; LINEAR8 equ 5
  4663                              <1>         ; PLANAR4 equ 4
  4664                              <1>         ; PLANAR1 equ 3
  4665                              <1> 
  4666 0000291B 803E04              <1> 	cmp	byte [esi], PLANAR4
  4667 0000291E 742C                <1> 	je	short vga_g_down_planar
  4668 00002920 803E03              <1> 	cmp	byte [esi], PLANAR1
  4669 00002923 7427                <1> 	je	short vga_g_down_planar
  4670                              <1> vga_g_down_linear8:
  4671                              <1> 	; 07/07/2016 (TEMPORARY)
  4672                              <1> 	;
  4673                              <1> 	; cl = upper left column ; cul
  4674                              <1> 	; ch = upper left row ; rul
  4675                              <1> 	; dl = lower rigth column ; clr
  4676                              <1> 	; dh = lower right row ; rlr
  4677                              <1> 
  4678                              <1> vga_g_down_l0:
  4679                              <1> 	;{for(i=rlr;i>=rul;i--)
  4680                              <1>         ; if((i<rul+nblines)||(nblines==0))
  4681 00002925 08C0                <1> 	or	al, al
  4682 00002927 741C                <1> 	jz	short vga_g_down_l2
  4683 00002929 88C4                <1> 	mov	ah, al
  4684 0000292B 00EC                <1> 	add	ah, ch
  4685                              <1> 	;jc	short vga_g_down_l2	
  4686 0000292D 86EE                <1> 	xchg	ch, dh
  4687 0000292F 38E5                <1> 	cmp	ch, ah
  4688 00002931 7212                <1> 	jb	short vga_g_down_l2
  4689 00002933 88EC                <1> 	mov	ah, ch
  4690 00002935 28C4                <1> 	sub	ah, al ; ah = i - nblines
  4691                              <1> 	; else
  4692                              <1> 	; vgamem_copy_pl4(cul,i,i-nblines,cols,nbcols,cheight);
  4693 00002937 E877FEFFFF          <1> 	call	vgamem_copy_l8
  4694                              <1> vga_g_down_l1:
  4695 0000293C 86F5                <1> 	xchg	dh, ch
  4696 0000293E FECE                <1> 	dec	dh 
  4697 00002940 38EE                <1> 	cmp	dh, ch
  4698 00002942 73E1                <1> 	jnb	short vga_g_down_l0
  4699 00002944 C3                  <1> 	retn
  4700                              <1> 
  4701                              <1> vga_g_down_l2:
  4702                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  4703 00002945 E8D3FEFFFF          <1> 	call	vgamem_fill_l8
  4704 0000294A EBF0                <1> 	jmp	short vga_g_down_l1
  4705                              <1> 		 
  4706                              <1> vga_g_down_planar:
  4707                              <1> 	; cl = upper left column ; cul
  4708                              <1> 	; ch = upper left row ; rul
  4709                              <1> 	; dl = lower rigth column ; clr
  4710                              <1> 	; dh = lower right row ; rlr
  4711                              <1> vga_g_down_pl0:
  4712                              <1>  	;{for(i=rlr;i>=rul;i--)
  4713                              <1>         ; if((i<rul+nblines)||(nblines==0))
  4714 0000294C 08C0                <1> 	or	al, al
  4715 0000294E 741C                <1> 	jz	short vga_g_down_pl2
  4716 00002950 88C4                <1> 	mov	ah, al
  4717 00002952 00EC                <1> 	add	ah, ch
  4718                              <1> 	;jc	short vga_g_down_pl2	
  4719 00002954 86EE                <1> 	xchg	ch, dh
  4720 00002956 38E5                <1> 	cmp	ch, ah
  4721 00002958 7212                <1> 	jb	short vga_g_down_pl2
  4722 0000295A 88EC                <1> 	mov	ah, ch
  4723 0000295C 28C4                <1> 	sub	ah, al ; ah = i - nblines
  4724                              <1> 	; else
  4725                              <1> 	; vgamem_copy_pl4(cul,i,i-nblines,cols,nbcols,cheight);
  4726 0000295E E88BFDFFFF          <1> 	call	vgamem_copy_pl4
  4727                              <1> vga_g_down_pl1:
  4728 00002963 86F5                <1> 	xchg	dh, ch
  4729 00002965 FECE                <1> 	dec	dh 
  4730 00002967 38EE                <1> 	cmp	dh, ch
  4731 00002969 73E1                <1> 	jnb	short vga_g_down_pl0
  4732 0000296B C3                  <1> 	retn
  4733                              <1> 
  4734                              <1> vga_g_down_pl2:
  4735                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  4736 0000296C E8EBFDFFFF          <1> 	call	vgamem_fill_pl4
  4737 00002971 EBF0                <1> 	jmp	short vga_g_down_pl1
  4738                              <1> 
  4739                              <1> ; 07/07/2016
  4740                              <1> ; 27/06/2016 - TRDOS 386 (TRDOS v2.0)
  4741                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  4742                              <1> ;------------------------------------------------------
  4743                              <1> ; SCROLL DOWN
  4744                              <1> ;  THIS ROUTINE SCROLLS DOWN THE INFORMATION ON THE CRT
  4745                              <1> ; ENTRY --
  4746                              <1> ;  CH,CL = UPPER LEFT CORNER OF REGION TO SCROLL
  4747                              <1> ;  DH,DL = LOWER RIGHT CORNER OF REGION TO SCROLL
  4748                              <1> ;   BOTH OF THE ABOVE ARE IN CHARACTER POSITIONS
  4749                              <1> ;  BH = FILL VALUE FOR BLANKED LINES
  4750                              <1> ;  AL = # LINES TO SCROLL (AL=0 MEANS BLANK THE ENTIRE FIELD)
  4751                              <1> ;  DS = DATA SEGMENT
  4752                              <1> ;  ES = REGEN SEGMENT
  4753                              <1> ; EXIT --
  4754                              <1> ;  NOTHING, THE SCREEN IS SCROLLED
  4755                              <1> ;--------------------------------------------------------
  4756                              <1> 
  4757                              <1> 	; cl = upper left column
  4758                              <1> 	; ch = upper left row
  4759                              <1> 	; dl = lower rigth column
  4760                              <1> 	; dh = lower right row
  4761                              <1> 	;
  4762                              <1> 	; al = line count (AL=0 means blank entire fields)
  4763                              <1> 	; bl = fill value for blanked lines	
  4764                              <1> 	; bh = unused
  4765                              <1> 
  4766                              <1> GRAPHICS_DOWN:
  4767                              <1> 	; 07/07/2016
  4768                              <1> 	;AH = Current video mode, [CRT_MODE]
  4769                              <1> 	;STD				; SET DIRECTION
  4770 00002973 80FC07              <1> 	cmp	ah, 7
  4771 00002976 0F87F4FEFFFF        <1>         ja      vga_graphics_down
  4772                              <1> 	;je	_n0
  4773                              <1> 
  4774 0000297C 88C7                <1> 	MOV	bh, al			; save line count in BH
  4775 0000297E 6689D0              <1> 	MOV	AX, DX			; GET LOWER RIGHT POSITION INTO AX REG
  4776                              <1> 
  4777                              <1> ;-----	USE CHARACTER SUBROUTINE FOR POSITIONING
  4778                              <1> ;-----	ADDRESS RETURNED IS MULTIPLIED BY 2 FROM CORRECT VALUE
  4779                              <1> 
  4780 00002981 E8F2010000          <1> 	CALL	GRAPH_POSN
  4781 00002986 0FB7F8              <1> 	MOVzx	eDI, AX			; SAVE RESULT AS DESTINATION ADDRESS
  4782                              <1> 
  4783                              <1> ;-----	DETERMINE SIZE OF WINDOW
  4784                              <1> 
  4785 00002989 6629CA              <1> 	SUB	DX, CX
  4786 0000298C 6681C20101          <1>         ADD     DX, 101h                ; ADJUST VALUES
  4787 00002991 C0E602              <1> 	SAL	DH, 2			; MULTIPLY ROWS BY 4 AT 8 VERT DOTS/CHAR
  4788                              <1> 					; AND EVEN/ODD ROWS
  4789                              <1> 
  4790                              <1> ;-----	DETERMINE CRT MODE
  4791                              <1> 
  4792 00002994 803D[BA6F0000]06    <1> 	CMP	byte [CRT_MODE], 6	; TEST FOR MEDIUM RES
  4793 0000299B 7307                <1>         JNC     short _R12              ; FIND_SOURCE_DOWN
  4794                              <1> 
  4795                              <1> ;-----	MEDIUM RES DOWN
  4796 0000299D D0E2                <1> 	SAL	DL, 1			; # COLUMNS * 2, SINCE 2 BYTES/CHAR
  4797 0000299F 66D1E7              <1> 	SAL	DI, 1			; OFFSET *2 SINCE 2 BYTES/CHAR
  4798 000029A2 6647                <1> 	INC	DI			; POINT TO LAST BYTE
  4799                              <1> 
  4800                              <1> ;-----	DETERMINE THE SOURCE ADDRESS IN THE BUFFER
  4801                              <1> 
  4802                              <1> _R12:                                   ; FIND_SOURCE_DOWN
  4803 000029A4 81C700800B00        <1> 	add	edi, 0B8000h		
  4804 000029AA 6681C7F000          <1> 	ADD	DI, 240			; POINT TO LAST ROW OF PIXELS
  4805 000029AF C0E702              <1> 	sal	bh, 2			; multiply number of lines by 4
  4806 000029B2 74(06)              <1> 	JZ	short 6			; IF ZERO, THEN BLANK ENTIRE FIELD
  4807 000029B4 B050                <1> 	MOV	AL, 80			; 80 BYTES/ROW
  4808 000029B6 F6E7                <1> 	mul	bh			; determine offset to source
  4809 000029B8 89FE                <1> 	MOV	eSI, eDI		; SET UP SOURCE
  4810 000029BA 6629C6              <1> 	SUB	SI, AX			; SUBTRACT THE OFFSET
  4811 000029BD 88F4                <1> 	MOV	AH, DH			; NUMBER OF ROWS IN FIELD
  4812 000029BF 28FC                <1> 	sub	ah, bh			; determine number to move
  4813                              <1> 
  4814                              <1> ;-----	LOOP THROUGH, MOVING ONE ROW AT A TIME, BOTH EVEN AND ODD FIELDS
  4815                              <1> 
  4816                              <1> _R13:                                   ; ROW_LOOP_DOWN
  4817 000029C1 E824000000          <1>         CALL    _R17                    ; MOVE ONE ROW
  4818 000029C6 6681EE5020          <1> 	SUB	SI, 2000h+80		; MOVE TO NEXT ROW
  4819 000029CB 6681EF5020          <1> 	SUB	DI, 2000h+80
  4820 000029D0 FECC                <1> 	DEC	AH			; NUMBER OF ROWS TO MOVE
  4821 000029D2 75ED                <1>         JNZ     short _R13              ; CONTINUE TILL ALL MOVED
  4822                              <1> 
  4823                              <1> ;-----	FILL IN THE VACATED LINE(S)
  4824                              <1> _R14:                                   ; CLEAR_ENTRY_DOWN
  4825 000029D4 88D8                <1> 	mov	al, bl			; attribute to fill with
  4826                              <1> _R15_:                                  ; CLEAR_LOOP_DOWN
  4827 000029D6 E82B000000          <1> 	CALL	_R18			; CLEAR A ROW
  4828 000029DB 6681EF5020          <1> 	SUB	DI, 2000h+80		; POINT TO NEXT LINE
  4829 000029E0 FECF                <1> 	dec	bh			; number of lines to fill
  4830 000029E2 75F2                <1>         JNZ     short _R15_             ; CLEAR_LOOP_DOWN
  4831                              <1> 	; 18/11/2020
  4832 000029E4 FC                  <1> 	CLD				; RESET THE DIRECTION FLAG
  4833                              <1> 	
  4834 000029E5 C3                  <1> 	retn				; EVERYTHING DONE
  4835                              <1> 
  4836                              <1> _R16:                                   ; BLANK_FIELD_DOWN
  4837 000029E6 88F7                <1> 	mov	bh, dh			; set blank count to everything in field
  4838 000029E8 EBEA                <1>         JMP     short _R14              ; CLEAR THE FIELD
  4839                              <1> 
  4840                              <1> ; 27/06/2016 - TRDOS 386 (TRDOS v2.0)
  4841                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  4842                              <1> 
  4843                              <1> ;-----	ROUTINE TO MOVE ONE ROW OF INFORMATION
  4844                              <1> 
  4845                              <1> _R17:
  4846 000029EA 0FB6CA              <1> 	MOVzx	ecx, DL			; NUMBER OF BYTES IN THE ROW
  4847 000029ED 56                  <1> 	PUSH	eSI
  4848 000029EE 57                  <1> 	PUSH	eDI			; SAVE POINTERS
  4849 000029EF F3A4                <1> 	REP	MOVSB			; MOVE THE EVEN FIELD
  4850 000029F1 5F                  <1> 	POP	eDI
  4851 000029F2 5E                  <1> 	POP	eSI
  4852 000029F3 6681C60020          <1> 	ADD	SI, 2000h
  4853 000029F8 6681C70020          <1> 	ADD	DI, 2000h		; POINT TO THE ODD FIELD
  4854 000029FD 56                  <1> 	PUSH	eSI
  4855 000029FE 57                  <1> 	PUSH	eDI			; SAVE THE POINTERS
  4856 000029FF 88D1                <1> 	MOV	CL, DL			; COUNT BACK
  4857 00002A01 F3A4                <1> 	REP	MOVSB			; MOVE THE ODD FIELD
  4858 00002A03 5F                  <1> 	POP	eDI
  4859 00002A04 5E                  <1> 	POP	eSI			; POINTERS BACK
  4860 00002A05 C3                  <1> 	RETn				; RETURN TO CALLER
  4861                              <1> 
  4862                              <1> ;-----	CLEAR A SINGLE ROW
  4863                              <1> 
  4864                              <1> _R18:
  4865 00002A06 0FB6CA              <1> 	MOVzx	ecx, DL			; NUMBER OF BYTES IN FIELD
  4866 00002A09 57                  <1> 	PUSH	eDI			; SAVE POINTER
  4867 00002A0A F3AA                <1> 	REP	STOSB			; STORE THE NEW VALUE
  4868 00002A0C 5F                  <1> 	POP	eDI			; POINTER BACK
  4869 00002A0D 6681C70020          <1> 	ADD	DI, 2000h		; POINT TO ODD FIELD
  4870 00002A12 57                  <1> 	PUSH	eDI
  4871 00002A13 88D1                <1> 	MOV	CL, DL
  4872 00002A15 F3AA                <1> 	REP	STOSB			; FILL THE ODD FIELD
  4873 00002A17 5F                  <1> 	POP	eDI
  4874 00002A18 C3                  <1> 	RETn				; RETURN TO CALLER
  4875                              <1> 
  4876                              <1> ; 04/07/2016
  4877                              <1> ; 01/07/2016
  4878                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  4879                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  4880                              <1> ;--------------------------------------------------
  4881                              <1> ; GRAPHICS WRITE
  4882                              <1> ;  THIS ROUTINE WRITES THE ASCII CHARACTER TO THE CURRENT
  4883                              <1> ;  POSITION ON THE SCREEN.
  4884                              <1> ; ENTRY --
  4885                              <1> ;  AL = CHARACTER TO WRITE
  4886                              <1> ;  BL = COLOR ATTRIBUTE TO BE USED FOR FOREGROUND COLOR
  4887                              <1> ;	IF BIT 7 IS SET, THE CHAR IS XOR'D INTO THE REGEN BUFFER
  4888                              <1> ;	(0 IS USED FOR THE BACKGROUND COLOR)
  4889                              <1> ;  CX = NUMBER OF CHARS TO WRITE
  4890                              <1> ;  DS = DATA SEGMENT
  4891                              <1> ;  ES = REGEN SEGMENT
  4892                              <1> ; EXIT --
  4893                              <1> ;  NOTHING IS RETURNED
  4894                              <1> ;
  4895                              <1> ; GRAPHICS READ
  4896                              <1> ;  THIS ROUTINE READS THE ASCII CHARACTER AT THE CURRENT CURSOR
  4897                              <1> ;  POSITION ON THE SCREEN BY MATCHING THE DOTS ON THE SCREEN TO THE
  4898                              <1> ;  CHARACTER GENERATOR CODE POINTS
  4899                              <1> ; ENTRY --
  4900                              <1> ;  NONE (0 IS ASSUMED AS THE BACKGROUND COLOR)
  4901                              <1> ; EXIT --
  4902                              <1> ;  AL = CHARACTER READ AT THAT POSITION (0 RETURNED IF NONE FOUND)
  4903                              <1> ;
  4904                              <1> ; FOR BOTH ROUTINES, THE IMAGES USED TO FORM CHARS ARE CONTAINED IN ROM
  4905                              <1> ;  FOR THE 1ST 128 CHARS.  TO ACCESS CHARS IN THE SECOND HALF, THE USER
  4906                              <1> ;  MUST INITIALIZE THE VECTOR AT INTERRUPT 1FH (LOCATION 0007CH) TO
  4907                              <1> ;  POINT TO THE USER SUPPLIED TABLE OF GRAPHIC IMAGES (8X8 BOXES).
  4908                              <1> ;  FAILURE TO DO SO WILL CAUSE IN STRANGE RESULTS
  4909                              <1> ;-----------------------------------------------------
  4910                              <1> 
  4911                              <1> GRAPHICS_WRITE:
  4912 00002A19 25FF000000          <1> 	and 	eax, 0FFh		; ZERO TO HIGH OF CODE POINT
  4913 00002A1E 50                  <1> 	PUSH	eAX			; SAVE CODE POINT VALUE
  4914                              <1> 
  4915                              <1> ;-----	DETERMINE POSITION IN REGEN BUFFER TO PUT CODE POINTS
  4916                              <1> 
  4917 00002A1F E84D010000          <1> 	CALL	S26			; FIND LOCATION IN REGEN BUFFER
  4918 00002A24 89C7                <1> 	MOV	eDI, eAX		; REGEN POINTER IN DI
  4919                              <1> 
  4920                              <1> ;-----	DETERMINE REGION TO GET CODE POINTS FROM
  4921                              <1> 
  4922 00002A26 58                  <1> 	POP	eAX			; RECOVER CODE POINT
  4923                              <1> 
  4924 00002A27 BE[24580100]        <1> 	MOV	eSI, CRT_CHAR_GEN	; OFFSET OF IMAGES
  4925                              <1> 
  4926                              <1> ;-----	DETERMINE GRAPHICS MODE IN OPERATION
  4927                              <1> 					; DETERMINE_MODE
  4928 00002A2C 66C1E003            <1> 	SAL	AX, 3			; MULTIPLY CODE POINT VALUE BY 8
  4929 00002A30 01C6                <1> 	ADD	eSI, eAX		; SI HAS OFFSET OF DESIRED CODES
  4930                              <1> 	
  4931 00002A32 803D[BA6F0000]06    <1> 	CMP	byte [CRT_MODE], 6
  4932 00002A39 7231                <1> 	JC	short S6		; TEST FOR MEDIUM RESOLUTION MODE
  4933                              <1> 
  4934                              <1> ;-----	HIGH RESOLUTION MODE
  4935                              <1> 
  4936 00002A3B 81C700800B00        <1> 	add	edi, 0B8000h
  4937                              <1> S1:					; HIGH_CHAR
  4938 00002A41 57                  <1> 	PUSH	eDI			; SAVE REGEN POINTER
  4939 00002A42 56                  <1> 	PUSH	eSI			; SAVE CODE POINTER
  4940 00002A43 B604                <1> 	MOV	DH, 4			; NUMBER OF TIMES THROUGH LOOP
  4941                              <1> S2:
  4942 00002A45 AC                  <1> 	LODSB				; GET BYTE FROM CODE POINTS
  4943 00002A46 F6C380              <1> 	TEST	BL, 80H			; SHOULD WE USE THE FUNCTION
  4944 00002A49 7515                <1> 	JNZ	short S5		; TO PUT CHAR IN
  4945 00002A4B AA                  <1> 	STOSB				; STORE IN REGEN BUFFER
  4946 00002A4C AC                  <1> 	LODSB
  4947                              <1> S4:
  4948 00002A4D 8887FF1F0000        <1> 	MOV	[eDI+2000H-1], AL ; STORE IN SECOND HALF
  4949 00002A53 83C74F              <1> 	ADD	eDI, 79			; MOVE TO NEXT ROW IN REGEN
  4950 00002A56 FECE                <1> 	DEC	DH			; DONE WITH LOOP
  4951 00002A58 75EB                <1> 	JNZ	short S2
  4952 00002A5A 5E                  <1> 	POP	eSI
  4953 00002A5B 5F                  <1> 	POP	eDI			; RECOVER REGEN POINTER
  4954 00002A5C 47                  <1> 	INC	eDI			; POINT TO NEXT CHAR POSITION
  4955 00002A5D E2E2                <1> 	LOOP	S1			; MORE CHARS TO WRITE
  4956 00002A5F C3                  <1> 	retn
  4957                              <1> 
  4958                              <1> S5:
  4959 00002A60 3207                <1> 	XOR	AL, [eDI]		; EXCLUSIVE OR WITH CURRENT
  4960 00002A62 AA                  <1> 	STOSB				; STORE THE CODE POINT
  4961 00002A63 AC                  <1> 	LODSB				; AGAIN FOR ODD FIELD
  4962 00002A64 3287FF1F0000        <1> 	XOR	AL, [eDI+2000H-1]
  4963 00002A6A EBE1                <1> 	JMP	short S4		; BACK TO MAINSTREAM
  4964                              <1> 
  4965                              <1> ;-----	MEDIUM RESOLUTION WRITE
  4966                              <1> S6:					; MED_RES_WRITE
  4967 00002A6C 88DA                <1> 	MOV	DL, BL			; SAVE HIGH COLOR BIT
  4968 00002A6E 66D1E7              <1> 	SAL	DI, 1			; OFFSET*2 SINCE 2 BYTES/CHAR
  4969                              <1> 					; EXPAND BL TO FULL WORD OF COLOR
  4970 00002A71 80E303              <1> 	AND	BL, 3			; ISOLATE THE COLOR BITS ( LOW 2 BITS )
  4971 00002A74 B055                <1> 	MOV	AL, 055H 		; GET BIT CONVERSION MULTIPLIER
  4972 00002A76 F6E3                <1> 	MUL	BL			; EXPAND 2 COLOR BITS TO 4 REPLICATIONS
  4973 00002A78 88C3                <1> 	MOV	BL, AL			; PLACE BACK IN WORK REGISTER
  4974 00002A7A 88C7                <1> 	MOV	BH, AL			; EXPAND TO 8 REPLICATIONS OF COLOR BITS
  4975 00002A7C 81C700800B00        <1> 	add	edi, 0B8000h
  4976                              <1> S7:                                     ; MED_CHAR
  4977 00002A82 57                  <1> 	PUSH	eDI			; SAVE REGEN POINTER
  4978 00002A83 56                  <1> 	PUSH	eSI			; SAVE THE CODE POINTER
  4979 00002A84 B604                <1> 	MOV	DH, 4			; NUMBER OF LOOPS
  4980                              <1> S8:
  4981 00002A86 AC                  <1> 	LODSB				; GET CODE POINT
  4982 00002A87 E8B3000000          <1> 	CALL	S21			; DOUBLE UP ALL THE BITS
  4983 00002A8C 6621D8              <1> 	AND	AX, BX			; CONVERT TO FOREGROUND COLOR ( 0 BACK )
  4984 00002A8F 86E0                <1> 	XCHG	AH, AL			; SWAP HIGH/LOW BYTES FOR WORD MOVE
  4985 00002A91 F6C280              <1> 	TEST	DL, 80H			; IS THIS XOR FUNCTION
  4986 00002A94 7403                <1> 	JZ	short S9		; NO, STORE IT IN AS IS
  4987 00002A96 663307              <1> 	XOR	AX, [eDI]		; DO FUNCTION WITH LOW/HIGH
  4988                              <1> S9:
  4989 00002A99 668907              <1> 	MOV	[eDI], AX		; STORE FIRST BYTE HIGH, SECOND LOW
  4990 00002A9C AC                  <1> 	LODSB				; GET CODE POINT
  4991 00002A9D E89D000000          <1> 	CALL	S21
  4992 00002AA2 6621D8              <1> 	AND	AX, BX			; CONVERT TO COLOR
  4993 00002AA5 86E0                <1> 	XCHG	AH, AL			; SWAP HIGH/LOW BYTES FOR WORD MOVE
  4994 00002AA7 F6C280              <1> 	TEST	DL, 80H			; AGAIN, IS THIS XOR FUNCTION
  4995 00002AAA 7407                <1> 	JZ	short _S10		; NO, JUST STORE THE VALUES
  4996 00002AAC 66338700200000      <1> 	XOR	AX, [eDI+2000H]		; FUNCTION WITH FIRST HALF LOW
  4997                              <1> _S10:
  4998 00002AB3 66898700200000      <1> 	MOV	[eDI+2000H], AX		; STORE SECOND PORTION HIGH
  4999 00002ABA 6683C750            <1> 	ADD	DI, 80			; POINT TO NEXT LOCATION
  5000 00002ABE FECE                <1> 	DEC	DH
  5001 00002AC0 75C4                <1> 	JNZ	short S8		; KEEP GOING
  5002 00002AC2 5E                  <1> 	POP	eSI			; RECOVER CODE POINTER
  5003 00002AC3 5F                  <1> 	POP	eDI			; RECOVER REGEN POINTER
  5004 00002AC4 47                  <1> 	INC	eDI			; POINT TO NEXT CHAR POSITION
  5005 00002AC5 47                  <1> 	INC	eDI
  5006 00002AC6 E2BA                <1> 	LOOP	S7			; MORE TO WRITE
  5007 00002AC8 C3                  <1> 	retn
  5008                              <1> 
  5009                              <1> ; 04/07/2016
  5010                              <1> ; 01/07/2016
  5011                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  5012                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  5013                              <1> ;----------------------------------------
  5014                              <1> ; GRAPHICS READ
  5015                              <1> ;----------------------------------------
  5016                              <1> GRAPHICS_READ:
  5017 00002AC9 E8A3000000          <1> 	CALL	S26			; CONVERTED TO OFFSET IN REGEN
  5018 00002ACE 89C6                <1> 	MOV	eSI, eAX		; SAVE IN SI
  5019 00002AD0 81C600800B00        <1> 	add	esi, 0B8000h		; 01/07/2016
  5020 00002AD6 83EC08              <1> 	SUB	eSP, 8			; ALLOCATE SPACE FOR THE READ CODE POINT
  5021 00002AD9 89E5                <1> 	MOV	eBP, eSP		; POINTER TO SAVE AREA
  5022                              <1> 
  5023                              <1> ;-----	DETERMINE GRAPHICS MODES
  5024 00002ADB B604                <1> 	mov	dh, 4			; number of passes ; 01/07/2016
  5025 00002ADD 803D[BA6F0000]06    <1> 	CMP	byte [CRT_MODE], 6
  5026 00002AE4 7219                <1> 	JC	short S12		; MEDIUM RESOLUTION
  5027                              <1> 
  5028                              <1> ;-----	HIGH RESOLUTION READ
  5029                              <1> ;-----	GET VALUES FROM REGEN BUFFER AND CONVERT TO CODE POINT
  5030                              <1> 	;MOV	DH,4			; NUMBER OF PASSES
  5031                              <1> S11:
  5032 00002AE6 8A06                <1> 	MOV	AL, [eSI] 		; GET FIRST BYTE
  5033 00002AE8 884500              <1> 	MOV	[eBP], AL 		; SAVE IN STORAGE AREA
  5034 00002AEB 45                  <1> 	INC	eBP			; NEXT LOCATION
  5035 00002AEC 8A8600200000        <1> 	MOV	AL, [eSI+2000H]		; GET LOWER REGION BYTE
  5036 00002AF2 884500              <1> 	MOV	[eBP], AL 		; ADJUST AND STORE
  5037 00002AF5 45                  <1> 	INC	eBP
  5038 00002AF6 83C650              <1> 	ADD	eSI, 80			; POINTER INTO REGEN
  5039 00002AF9 FECE                <1> 	DEC	DH			; LOOP CONTROL
  5040 00002AFB 75E9                <1> 	JNZ	short S11		; DO IT SOME MORE
  5041 00002AFD EB1D                <1> 	JMP	SHORT S14		; GO MATCH THE SAVED CODE POINTS
  5042                              <1> 
  5043                              <1> ;-----	MEDIUM RESOLUTION READ
  5044                              <1> S12:	
  5045 00002AFF 66D1E6              <1> 	SAL	SI, 1			; OFFSET*2 SINCE 2 BYTES/CHAR
  5046                              <1> 	;MOV	DH, 4			; NUMBER OF PASSES
  5047                              <1> S13:
  5048 00002B02 E84D000000          <1> 	CALL	S23			; GET BYTES FROM REGEN INTO SINGLE SAVE
  5049 00002B07 81C6FE1F0000        <1> 	ADD	eSI, 2000H-2		; GO TO LOWER REGION
  5050 00002B0D E842000000          <1> 	CALL	S23			; GET THIS PAIR INTO SAVE
  5051 00002B12 81EEB21F0000        <1> 	SUB	eSI, 2000H-80+2		; ADJUST POINTER BACK INTO UPPER
  5052 00002B18 FECE                <1> 	DEC	DH
  5053 00002B1A 75E6                <1> 	JNZ	short S13		; KEEP GOING UNTIL ALL 8 DONE
  5054                              <1> 
  5055                              <1> ;-----	SAVE AREA HAS CHARACTER IN IT, MATCH IT
  5056                              <1> S14:					; FIND_CHAR
  5057 00002B1C BF[24580100]        <1> 	MOV	eDI, CRT_CHAR_GEN	; ESTABLISH ADDRESSING
  5058 00002B21 83ED08              <1> 	SUB	eBP, 8			; ADJUST POINTER TO START OF SAVE AREA
  5059 00002B24 89EE                <1> 	MOV	eSI, eBP
  5060                              <1> S15:
  5061 00002B26 66B80001            <1> 	mov	ax, 256			; NUMBER TO TEST AGAINST
  5062                              <1> S16:
  5063 00002B2A 56                  <1> 	PUSH	eSI			; SAVE SAVE AREA POINTER
  5064 00002B2B 57                  <1> 	PUSH	eDI			; SAVE CODE POINTER
  5065                              <1> 	;MOV	eCX, 4			; NUMBER OF WORDS TO MATCH
  5066                              <1> 	;REPE	CMPSW			; COMPARE THE 8 BYTES AS WORDS
  5067 00002B2C A7                  <1> 	cmpsd				; compare first 4 bytes 
  5068 00002B2D 7501                <1> 	jne	short S17		; 
  5069 00002B2F A7                  <1> 	cmpsd				; compare last 4 bytes
  5070                              <1> S17:
  5071 00002B30 5F                  <1> 	POP	eDI			; RECOVER THE POINTERS
  5072 00002B31 5E                  <1> 	POP	eSI
  5073                              <1> 	;JZ	short S18		; IF ZERO FLAG SET, THEN MATCH OCCURRED
  5074 00002B32 7407                <1> 	je	short S18
  5075                              <1> 	;				; NO MATCH, MOVE ON TO NEXT
  5076 00002B34 83C708              <1> 	ADD	eDI, 8			; NEXT CODE POINT
  5077 00002B37 6648                <1> 	dec	ax			; LOOP CONTROL
  5078 00002B39 75EF                <1> 	JNZ	short S16		; DO ALL OF THEM
  5079                              <1> 
  5080                              <1> ;-----	CHARACTER IS FOUND ( AL=0 IF NOT FOUND )
  5081                              <1> S18:	
  5082 00002B3B 83C408              <1> 	ADD	eSP, 8			; READJUST THE STACK, THROW AWAY SAVE
  5083 00002B3E C3                  <1> 	retn				; ALL DONE
  5084                              <1> 
  5085                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  5086                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  5087                              <1> ;--------------------------------------------
  5088                              <1> ; EXPAND BYTE
  5089                              <1> ;  THIS ROUTINE TAKES THE BYTE IN AL AND DOUBLES ALL
  5090                              <1> ;  OF THE BITS, TURNING THE 8 BITS INTO 16 BITS.
  5091                              <1> ;  THE RESULT IS LEFT IN AX
  5092                              <1> ;--------------------------------------------
  5093                              <1> S21:
  5094 00002B3F 6651                <1> 	PUSH	CX			; SAVE REGISTER
  5095                              <1> 	;MOV	CX, 8			; SHIFT COUNT REGISTER FOR ONE BYTE
  5096 00002B41 B108                <1> 	mov	cl, 8
  5097                              <1> S22:
  5098 00002B43 D0C8                <1> 	ROR	AL,1			; SHIFT BITS, LOW BIT INTO CARRY FLAG
  5099 00002B45 66D1DD              <1> 	RCR	BP,1			; MOVE CARRY FLAG (LOW BIT INTO RESULTS
  5100 00002B48 66D1FD              <1> 	SAR	BP,1			; SIGN EXTEND HIGH BIT (DOUBLE IT)
  5101                              <1> 	;LOOP	S22			; REPEAT FOR ALL 8 BITS
  5102 00002B4B FEC9                <1> 	dec	cl
  5103 00002B4D 75F4                <1> 	jnz	short S22
  5104 00002B4F 6695                <1> 	XCHG	AX, BP			; MOVE RESULTS TO PARAMETER REGISTER
  5105 00002B51 6659                <1> 	POP	CX			; RECOVER REGISTER
  5106 00002B53 C3                  <1> 	RETn				; ALL DONE
  5107                              <1> 
  5108                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  5109                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  5110                              <1> ;--------------------------------------------------
  5111                              <1> ; MED_READ_BYTE
  5112                              <1> ; THIS ROUTINE WILL TAKE 2 BYTES FROM THE REGEN BUFFER,
  5113                              <1> ;  COMPARE AGAINST THE CURRENT FOREGROUND COLOR, AND PLACE
  5114                              <1> ;  THE CORRESPONDING ON/OFF BIT PATTERN INTO THE CURRENT
  5115                              <1> ;  POSITION IN THE SAVE AREA
  5116                              <1> ; ENTRY --
  5117                              <1> ;  SI,DS = POINTER TO REGEN AREA OF INTEREST
  5118                              <1> ;  BX = EXPANDED FOREGROUND COLOR
  5119                              <1> ;  BP = POINTER TO SAVE AREA
  5120                              <1> ; EXIT --
  5121                              <1> ;  SI AND BP ARE INCREMENTED
  5122                              <1> ;----------------------------------------------------
  5123                              <1> S23:
  5124 00002B54 66AD                <1> 	LODSW				; GET FIRST BYTE AND SECOND BYTES
  5125 00002B56 86C4                <1> 	XCHG	AL, AH			; SWAP FOR COMPARE
  5126 00002B58 66B900C0            <1> 	MOV	CX, 0C000H		; 2 BIT MASK TO TEST THE ENTRIES
  5127 00002B5C B200                <1> 	MOV	DL, 0			; RESULT REGISTER
  5128                              <1> S24:
  5129 00002B5E 6685C8              <1> 	TEST	AX, CX			; IS THIS SECTION BACKCROUND?
  5130 00002B61 7401                <1>         JZ      short S25               ; IF ZERO, IT IS BACKGROUND (CARRY=0)
  5131 00002B63 F9                  <1> 	STC				; WASN'T, SO SET CARRY
  5132                              <1> S25:
  5133 00002B64 D0D2                <1> 	RCL	DL, 1			; MOVE THAT BIT INTO THE RESULT
  5134 00002B66 66C1E902            <1> 	SHR	CX, 2			; MOVE THE MASK TO THE RIGHT BY 2 BITS
  5135 00002B6A 73F2                <1> 	JNC	short S24		; DO IT AGAIN IF MASK DIDN'T FALL OUT
  5136 00002B6C 885500              <1> 	MOV	[eBP], DL 		; STORE RESULT IN SAVE AREA
  5137 00002B6F 45                  <1> 	INC	eBP			; ADJUST POINTER
  5138 00002B70 C3                  <1> 	RETn				; ALL DONE
  5139                              <1> 
  5140                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  5141                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  5142                              <1> ;-----------------------------------------
  5143                              <1> ; V4_POSITION
  5144                              <1> ;  THIS ROUTINE TAKES THE CURSOR POSITION CONTAINED IN
  5145                              <1> ;  THE MEMORY LOCATION, AND CONVERTS IT INTO AN OFFSET
  5146                              <1> ;  INTO THE REGEN BUFFER, ASSUMING ONE BYTE/CHAR.
  5147                              <1> ;  FOR MEDIUM RESOLUTION GRAPHICS, THE NUMBER MUST
  5148                              <1> ;  BE DOUBLED.
  5149                              <1> ; ENTRY -- NO REGISTERS,MEMORY LOCATION @CURSOR_POSN IS USED
  5150                              <1> ; EXIT--
  5151                              <1> ;  AX CONTAINS OFFSET INTO REGEN BUFFER
  5152                              <1> ;-----------------------------------------
  5153                              <1> S26:
  5154 00002B71 0FB705[AE810100]    <1> 	movzx	eax, word [CURSOR_POSN]	; GET CURRENT CURSOR
  5155                              <1> GRAPH_POSN:
  5156 00002B78 53                  <1> 	PUSH	eBX			; SAVE REGISTER
  5157 00002B79 0FB6D8              <1> 	movzx	ebx, al			; SAVE A COPY OF CURRENT CURSOR
  5158 00002B7C A0[BC6F0000]        <1> 	MOV	AL, [CRT_COLS]		; GET BYTES PER COLUMN
  5159 00002B81 F6E4                <1> 	MUL	AH			; MULTIPLY BY ROWS
  5160 00002B83 66C1E002            <1> 	SHL	AX, 2			; MULTIPLY * 4 SINCE 4 ROWS/BYTE
  5161 00002B87 01D8                <1> 	ADD	eAX, eBX		; DETERMINE OFFSET
  5162 00002B89 5B                  <1> 	POP	eBX			; RECOVER POINTER
  5163 00002B8A C3                  <1> 	RETn				; ALL DONE
  5164                              <1> 
  5165                              <1> ; 09/07/2016
  5166                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  5167                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  5168                              <1> ;---------------------------------------------
  5169                              <1> ; SET_COLOR
  5170                              <1> ;	THIS ROUTINE WILL ESTABLISH THE BACKGROUND COLOR, THE OVERSCAN COLOR,
  5171                              <1> ;	AND THE FOREGROUND COLOR SET FOR MEDIUM RESOLUTION GRAPHICS
  5172                              <1> ; INPUT
  5173                              <1> ;	(BH) HAS COLOR ID
  5174                              <1> ;		IF BH=0, THE BACKGROUND COLOR VALUE IS SET
  5175                              <1> ;			FROM THE LOW BITS OF BL (0-31)
  5176                              <1> ;		IF BH=1, THE PALETTE SELECTION IS MADE
  5177                              <1> ;			BASED ON THE LOW BIT OF BL:
  5178                              <1> ;				0 = GREEN, RED, YELLOW FOR COLORS 1,2,3
  5179                              <1> ;				1 = BLUE, CYAN, MAGENTA FOR COLORS 1,2,3
  5180                              <1> ;	(BL) HAS THE COLOR VALUE TO BE USED
  5181                              <1> ; OUTPUT
  5182                              <1> ;	THE COLOR SELECTION IS UPDATED
  5183                              <1> ;----------------------------------------------
  5184                              <1> SET_COLOR:
  5185 00002B8B 803D[BA6F0000]07    <1>         cmp     byte [CRT_MODE], 7      ; 09/07/2016
  5186 00002B92 0F87BFEFFFFF        <1> 	ja	VIDEO_RETURN		; nothing to do for VGA modes	 
  5187                              <1> 
  5188                              <1> 	;MOV	DX, [ADDR_6845]		; I/O PORT FOR PALETTE
  5189                              <1> 	;mov	dx, 3D4h
  5190                              <1> 	;ADD	DX,5			; OVERSCAN PORT
  5191 00002B98 66BAD903            <1> 	mov	dx, 3D9h
  5192 00002B9C A0[BD6F0000]        <1> 	MOV	AL, [CRT_PALETTE] 	; GET THE CURRENT PALETTE VALUE
  5193 00002BA1 08FF                <1> 	OR	BH, BH			; IS THIS COLOR 0?
  5194 00002BA3 7512                <1> 	JNZ	short M20		; OUTPUT COLOR 1
  5195                              <1> 
  5196                              <1> ;-----	HANDLE COLOR 0 BY SETTING THE BACKGROUND COLOR
  5197                              <1> 
  5198 00002BA5 24E0                <1> 	AND	AL, 0E0H 		; TURN OFF LOW 5 BITS OF CURRENT
  5199 00002BA7 80E31F              <1> 	AND	BL, 01FH 		; TURN OFF HIGH 3 BITS OF INPUT VALUE
  5200 00002BAA 08D8                <1> 	OR	AL, BL			; PUT VALUE INTO REGISTER
  5201                              <1> M19:					; OUTPUT THE PALETTE
  5202 00002BAC EE                  <1> 	OUT	DX, AL			; OUTPUT COLOR SELECTION TO 3D9 PORT
  5203 00002BAD A2[BD6F0000]        <1> 	MOV	[CRT_PALETTE], AL 	; SAVE THE COLOR VALUE
  5204 00002BB2 E9A0EFFFFF          <1> 	JMP	VIDEO_RETURN
  5205                              <1> 
  5206                              <1> ;-----	HANDLE COLOR 1 BY SELECTING THE PALETTE TO BE USED
  5207                              <1> 
  5208                              <1> M20:
  5209 00002BB7 24DF                <1> 	AND	AL, 0DFH 		; TURN OFF PALETTE SELECT BIT
  5210 00002BB9 D0EB                <1> 	SHR	BL, 1			; TEST THE LOW ORDER BIT OF BL
  5211 00002BBB 73EF                <1> 	JNC	short M19		; ALREADY DONE
  5212 00002BBD 0C20                <1> 	OR	AL, 20H			; TURN ON PALETTE SELECT BIT
  5213 00002BBF EBEB                <1> 	JMP	short M19		; GO DO IT
  5214                              <1> 
  5215                              <1> ; 09/07/2016
  5216                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  5217                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  5218                              <1> ;--------------------------------------------
  5219                              <1> ; READ DOT -- WRITE DOT
  5220                              <1> ; THESE ROUTINES WILL WRITE A DOT, OR READ THE
  5221                              <1> ;  DOT AT THE INDICATED LOCATION
  5222                              <1> ; ENTRY --
  5223                              <1> ;   DX = ROW (0-199)	(THE ACTUAL VALUE DEPENDS ON THE MODE)
  5224                              <1> ;   CX = COLUMN ( 0-639) ( THE VALUES ARE NOT RANGE CHECKED )
  5225                              <1> ;   AL = DOT VALUE TO WRITE (1,2 OR 4 BITS DEPENDING ON MODE,
  5226                              <1> ;	REQUIRED FOR WRITE DOT ONLY, RIGHT JUSTIFIED)
  5227                              <1> ;	BIT 7 OF AL = 1 INDICATES XOR THE VALUE INTO THE LOCATION
  5228                              <1> ;   DS = DATA SEGMENT
  5229                              <1> ;   ES = REGEN SEGMENT
  5230                              <1> ;
  5231                              <1> ; EXIT
  5232                              <1> ;	AL = DOT VALUE READ, RIGHT JUSTIFIED, READ ONLY
  5233                              <1> ;----------------------------------------------
  5234                              <1> 
  5235                              <1> READ_DOT:
  5236                              <1> 	; 09/07/2016
  5237 00002BC1 8A25[BA6F0000]      <1> 	mov	ah,  [CRT_MODE]
  5238 00002BC7 80FC07              <1> 	cmp	ah, 7 ; 6!?
  5239 00002BCA 760A                <1> 	jna	short read_dot_cga
  5240                              <1> 
  5241 00002BCC E8D7030000          <1> 	call	vga_read_pixel
  5242                              <1> 	; al = pixel value
  5243 00002BD1 E986EFFFFF          <1> 	jmp	_video_return
  5244                              <1> 
  5245                              <1> read_dot_cga:
  5246                              <1> 	;je	VIDEO_RETURN ; 7	
  5247 00002BD6 80FC04              <1> 	cmp	ah, 4 ; graphics ? 
  5248 00002BD9 0F8278EFFFFF        <1> 	jb	VIDEO_RETURN ; no, text mode, nothing to do
  5249                              <1> 
  5250 00002BDF E855000000          <1> 	CALL	R3			; DETERMINE BYTE POSITION OF DOT
  5251 00002BE4 8A06                <1> 	MOV	AL, [eSI]		; GET THE BYTE
  5252 00002BE6 20E0                <1> 	AND	AL, AH			; MASK OFF THE OTHER BITS IN THE BYTE
  5253 00002BE8 D2E0                <1> 	SHL	AL, CL			; LEFT JUSTIFY THE VALUE
  5254 00002BEA 88F1                <1> 	MOV	CL, DH			; GET NUMBER OF BITS IN RESULT
  5255 00002BEC D2C0                <1> 	ROL	AL, CL			; RIGHT JUSTIFY THE RESULT
  5256                              <1> 	;JMP	VIDEO_RETURN		; RETURN FROM VIDEO I/O
  5257 00002BEE 0FB6C0              <1> 	movzx	eax, al
  5258 00002BF1 E966EFFFFF          <1> 	jmp	_video_return
  5259                              <1> 
  5260                              <1> ; 09/07/2016
  5261                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  5262                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  5263                              <1> 
  5264                              <1> WRITE_DOT:
  5265                              <1> 	; 09/07/2016
  5266 00002BF6 8A25[BA6F0000]      <1> 	mov	ah, [CRT_MODE]
  5267 00002BFC 80FC07              <1> 	cmp	ah, 7 ; 6!?
  5268 00002BFF 760A                <1> 	jna	short write_dot_cga
  5269                              <1> 	
  5270 00002C01 E811030000          <1> 	call	vga_write_pixel
  5271 00002C06 E94CEFFFFF          <1> 	jmp	VIDEO_RETURN
  5272                              <1> 
  5273                              <1> write_dot_cga:
  5274                              <1> 	;je	VIDEO_RETURN ; 7	
  5275 00002C0B 80FC04              <1> 	cmp	ah, 4 ; graphics ? 
  5276 00002C0E 0F8243EFFFFF        <1> 	jb	VIDEO_RETURN ; no, text mode, nothing to do
  5277                              <1> 
  5278                              <1> 	;PUSH	AX			; SAVE DOT VALUE
  5279 00002C14 6650                <1> 	PUSH	AX			; TWICE
  5280 00002C16 E81E000000          <1> 	CALL	R3			; DETERMINE BYTE POSITION OF THE DOT
  5281 00002C1B D2E8                <1> 	SHR	AL, CL			; SHIFT TO SET UP THE BITS FOR OUTPUT
  5282 00002C1D 20E0                <1> 	AND	AL, AH			; STRIP OFF THE OTHER BITS
  5283 00002C1F 8A0E                <1> 	MOV	CL, [eSI]		; GET THE CURRENT BYTE
  5284 00002C21 665B                <1> 	POP	BX			; RECOVER XOR FLAG
  5285 00002C23 F6C380              <1> 	TEST	BL, 80H			; IS IT ON
  5286 00002C26 750D                <1> 	JNZ	short R2		; YES, XOR THE DOT
  5287 00002C28 F6D4                <1> 	NOT	AH			; SET MASK TO REMOVE THE INDICATED BITS
  5288 00002C2A 20E1                <1> 	AND	CL, AH
  5289 00002C2C 08C8                <1> 	OR	AL, CL			; OR IN THE NEW VALUE OF THOSE BITS
  5290                              <1> R1:					; FINISH_DOT
  5291 00002C2E 8806                <1> 	MOV	[eSI], AL		; RESTORE THE BYTE IN MEMORY
  5292                              <1> 	;POP	AX
  5293 00002C30 E922EFFFFF          <1> 	JMP	VIDEO_RETURN		; RETURN FROM VIDEO I/O
  5294                              <1> R2:					; XOR_DOT
  5295 00002C35 30C8                <1> 	XOR	AL, CL			; EXCLUSIVE OR THE DOTS
  5296 00002C37 EBF5                <1> 	JMP	short R1		; FINISH UP THE WRITING
  5297                              <1> 
  5298                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  5299                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  5300                              <1> 
  5301                              <1> ;----------------------------------------------
  5302                              <1> ; THIS SUBROUTINE DETERMINES THE REGEN BYTE LOCATION OF THE
  5303                              <1> ; INDICATED ROW COLUMN VALUE IN GRAPHICS MODE.
  5304                              <1> ; ENTRY --
  5305                              <1> ;  DX = ROW VALUE (0-199)
  5306                              <1> ;  CX = COLUMN VALUE (0-639)
  5307                              <1> ; EXIT --
  5308                              <1> ;  SI = OFFSET INTO REGEN BUFFER FOR BYTE OF INTEREST
  5309                              <1> ;  AH = MASK TO STRIP OFF THE BITS OF INTEREST
  5310                              <1> ;  CL = BITS TO SHIFT TO RIGHT JUSTIFY THE MASK IN AH
  5311                              <1> ;  DH = # BITS IN RESULT
  5312                              <1> ;  BX = MODIFIED
  5313                              <1> ;-----------------------------------------------
  5314                              <1> R3:
  5315                              <1> 
  5316                              <1> ;-----	DETERMINE 1ST BYTE IN INDICATED ROW BY MULTIPLYING ROW VALUE BY 40
  5317                              <1> ;-----	 ( LOW BIT OF ROW DETERMINES EVEN/ODD, 80 BYTES/ROW )
  5318                              <1> 
  5319 00002C39 0FB7F0              <1> 	movzx	esi, ax			; WILL SAVE AL AND AH DURING OPERATION
  5320 00002C3C B028                <1> 	MOV	AL, 40
  5321 00002C3E F6E2                <1> 	MUL	DL			; AX= ADDRESS OF START OF INDICATED ROW
  5322 00002C40 A808                <1> 	TEST	AL, 08H 		; TEST FOR EVEN/ODD ROW CALCULATED
  5323 00002C42 7404                <1> 	JZ	short R4		; JUMP IF EVEN ROW
  5324 00002C44 6605D81F            <1> 	ADD	AX, 2000H-40		; OFFSET TO LOCATION OF ODD ROWS ADJUST
  5325                              <1> R4:					; EVEN_ROW
  5326 00002C48 6696                <1> 	XCHG	SI, AX			; MOVE POINTER TO (SI) AND RECOVER (AX)
  5327 00002C4A 81C600800B00        <1> 	add	esi, 0B8000h
  5328 00002C50 6689CA              <1> 	MOV	DX, CX			; COLUMN VALUE TO DX
  5329                              <1> 
  5330                              <1> ;-----	DETERMINE GRAPHICS MODE CURRENTLY IN EFFECT
  5331                              <1> 
  5332                              <1> ; SET UP THE REGISTERS ACCORDING TO THE MODE
  5333                              <1> ; CH = MASK FOR LOW OF COLUMN ADDRESS ( 7/3 FOR HIGH/MED RES )
  5334                              <1> ; CL = # OF ADDRESS BITS IN COLUMN VALUE ( 3/2 FOR H/M )
  5335                              <1> ; BL = MASK TO SELECT BITS FROM POINTED BYTE ( 80H/C0H FOR H/M )
  5336                              <1> ; BH = NUMBER OF VALID BITS IN POINTED BYTE ( 1/2 FOR H/M )
  5337                              <1> 
  5338 00002C53 66BBC002            <1> 	MOV	BX, 2C0H
  5339 00002C57 66B90203            <1> 	MOV	CX, 302H 		; SET PARMS FOR MED RES
  5340 00002C5B 803D[BA6F0000]06    <1> 	CMP	byte [CRT_MODE], 6
  5341 00002C62 7208                <1> 	JC	short R5		; HANDLE IF MED RES
  5342 00002C64 66BB8001            <1> 	MOV	BX, 180H
  5343 00002C68 66B90307            <1> 	MOV	CX, 703H 		; SET PARMS FOR HIGH RES
  5344                              <1> 
  5345                              <1> ;-----	DETERMINE BIT OFFSET IN BYTE FROM COLUMN MASK
  5346                              <1> R5:
  5347 00002C6C 20D5                <1> 	AND	CH, DL			; ADDRESS OF PEL WITHIN BYTE TO CH
  5348                              <1> 
  5349                              <1> ;-----	DETERMINE BYTE OFFSET FOR THIS LOCATION IN COLUMN
  5350                              <1> 
  5351 00002C6E 66D3EA              <1> 	SHR	DX, CL			; SHIFT BY CORRECT AMOUNT
  5352 00002C71 6601D6              <1> 	ADD	SI, DX			; INCREMENT THE POINTER
  5353 00002C74 88FE                <1> 	MOV	DH, BH			; GET THE # OF BITS IN RESULT TO DH
  5354                              <1> 
  5355                              <1> ;-----	MULTIPLY BH (VALID BITS IN BYTE) BY CH (BIT OFFSET)
  5356                              <1> 
  5357 00002C76 28C9                <1> 	SUB	CL, CL			; ZERO INTO STORAGE LOCATION
  5358                              <1> R6:
  5359 00002C78 D0C8                <1> 	ROR	AL, 1			; LEFT JUSTIFY VALUE IN AL (FOR WRITE)
  5360 00002C7A 00E9                <1> 	ADD	CL, CH			; ADD IN THE BIT OFFSET VALUE
  5361 00002C7C FECF                <1> 	DEC	BH			; LOOP CONTROL
  5362 00002C7E 75F8                <1> 	JNZ	short R6		; ON EXIT, CL HAS COUNT TO RESTORE BITS
  5363 00002C80 88DC                <1> 	MOV	AH, BL			;  GET MASK TO AH
  5364 00002C82 D2EC                <1> 	SHR	AH, CL			;  MOVE THE MASK TO CORRECT LOCATION
  5365 00002C84 C3                  <1> 	RETn				;  RETURN WITH EVERYTHING SET UP
  5366                              <1> 
  5367                              <1> load_dac_palette:
  5368                              <1> 	; 29/07/2016
  5369                              <1> 	; 23/07/2016
  5370                              <1> 	; 03/07/2016 (TRDOS 386 = TRDOS v2.0)
  5371                              <1> 	; (set_mode_vga)
  5372                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5373                              <1> 	; vgabios-0.7a (2011)
  5374                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5375                              <1> 	; 'vgabios.c', 'load_dac_palette'
  5376                              <1> 	;
  5377                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
  5378                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
  5379                              <1> 	;
  5380                              <1> 	; INPUT -> AH = DAC selection number (3, 2 or 1)
  5381                              <1> 	; OUTPUT -> ECX = 0, AX = 0
  5382                              <1> 	; (Modifed registers: EAX, ECX, EDX, ESI)
  5383                              <1> 	;
  5384 00002C85 66BAC803            <1> 	mov	dx, 3C8h  ; VGAREG_DAC_WRITE_ADDRESS
  5385 00002C89 28C0                <1> 	sub	al, al ; 0
  5386 00002C8B EE                  <1> 	out	dx, al ; 0 ; color index, always 0 at the beginning	
  5387 00002C8C 6642                <1> 	inc	dx   ; 3C9h ; VGAREG_DAC_DATA
  5388 00002C8E B900010000          <1> 	mov	ecx, 256   ; always 256*3 values
  5389                              <1> 	;push	esi
  5390 00002C93 88E0                <1> 	mov	al, ah
  5391 00002C95 B43F                <1> 	mov	ah, 3Fh	; 3Fh except DAC selection number 3
  5392 00002C97 3C02                <1> 	cmp 	al, 2
  5393 00002C99 7414                <1> 	je	short l_dac_p_2
  5394 00002C9B 7719                <1> 	ja	short l_dac_p_3
  5395 00002C9D 20C0                <1> 	and	al, al
  5396 00002C9F 7507                <1> 	jnz	short l_dac_p_1
  5397                              <1> l_dac_p_0:
  5398 00002CA1 BE[E4520100]        <1> 	mov	esi, palette0
  5399 00002CA6 EB15                <1> 	jmp	short l_dac_p_4	
  5400                              <1> l_dac_p_1:
  5401 00002CA8 BE[A4530100]        <1> 	mov	esi, palette1
  5402 00002CAD EB0E                <1> 	jmp	short l_dac_p_4
  5403                              <1> l_dac_p_2:
  5404 00002CAF BE[64540100]        <1> 	mov	esi, palette2
  5405 00002CB4 EB07                <1> 	jmp	short l_dac_p_4
  5406                              <1> l_dac_p_3:
  5407 00002CB6 B4FF                <1> 	mov	ah, 0FFh ; dac registers
  5408 00002CB8 BE[24550100]        <1> 	mov	esi, palette3
  5409                              <1> l_dac_p_4:
  5410 00002CBD AC                  <1> 	lodsb
  5411 00002CBE EE                  <1> 	out	dx, al  ; Red
  5412 00002CBF AC                  <1> 	lodsb
  5413 00002CC0 EE                  <1> 	out	dx, al	; Green
  5414 00002CC1 AC                  <1> 	lodsb
  5415 00002CC2 EE                  <1> 	out	dx, al	; Blue
  5416 00002CC3 20E4                <1> 	and	ah, ah
  5417 00002CC5 7405                <1> 	jz	short l_dac_p_5	
  5418 00002CC7 FECC                <1> 	dec	ah
  5419 00002CC9 E2F2                <1> 	loop	l_dac_p_4
  5420                              <1> 	;pop	esi
  5421 00002CCB C3                  <1> 	retn
  5422                              <1> l_dac_p_5:
  5423                              <1> 	; 29/07/2016
  5424 00002CCC FEC9                <1> 	dec	cl
  5425 00002CCE 7407                <1> 	jz	short l_dac_p_7
  5426                              <1> 	;
  5427 00002CD0 28C0                <1> 	sub	al, al ; 0
  5428                              <1> l_dac_p_6:
  5429 00002CD2 EE                  <1> 	out	dx, al ; outb(VGAREG_DAC_DATA,0);
  5430 00002CD3 EE                  <1> 	out	dx, al
  5431 00002CD4 EE                  <1> 	out	dx, al
  5432 00002CD5 E2FB                <1> 	loop	l_dac_p_6
  5433                              <1> l_dac_p_7:
  5434                              <1> 	;pop	esi
  5435 00002CD7 C3                  <1> 	retn
  5436                              <1> 
  5437                              <1> gray_scale_summing:
  5438                              <1> 	; 03/07/2016 (TRDOS 386 = TRDOS v2.0)
  5439                              <1> 	; (set_mode_vga)
  5440                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5441                              <1> 	; vgabios-0.7a (2011)
  5442                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5443                              <1> 	; 'vgabios.c', 'biosfn_perform_gray_scale_summing'
  5444                              <1> 	;
  5445                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
  5446                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
  5447                              <1> 	;
  5448                              <1> 
  5449                              <1> 	; INPUT -> EBX = Start address (color index <= 255)
  5450                              <1> 	;	   ECX = Count (<= 256)
  5451                              <1> 	; OUTPUT -> (E)CX = 0
  5452                              <1> 	; (Modifed registers: EAX, ECX, EDX, EBX)
  5453                              <1> 
  5454 00002CD8 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5455 00002CDC EC                  <1> 	in	al, dx
  5456 00002CDD 30C0                <1> 	xor	al, al ; 0
  5457 00002CDF 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5458 00002CE3 EE                  <1> 	out	dx, al	; clear bit 5
  5459                              <1> 			; (while loading palette registers)
  5460                              <1> 	; set read address and switch to read mode
  5461                              <1> g_s_s_1:
  5462 00002CE4 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  5463 00002CE8 88D8                <1> 	mov	al, bl
  5464 00002CEA EE                  <1> 	out	dx, al
  5465                              <1> 	; get 6-bit wide RGB data values
  5466                              <1>  	; intensity = (0.3*Red)+(0.59*Green)+(0.11*Blue)
  5467                              <1> 	; i = ( ( 77*r + 151*g + 28*b ) + 0x80 ) >> 8;
  5468 00002CEB 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  5469 00002CEF EC                  <1> 	in	al, dx ; red
  5470 00002CF0 B44D                <1> 	mov	ah, 77 ; 0.3* Red
  5471 00002CF2 F6E4                <1> 	mul	ah
  5472 00002CF4 6650                <1> 	push	ax
  5473 00002CF6 EC                  <1> 	in	al, dx ; green
  5474 00002CF7 B497                <1> 	mov	ah, 151  ; 0.59 * Green
  5475 00002CF9 F6E4                <1> 	mul	ah
  5476 00002CFB 6650                <1> 	push	ax
  5477 00002CFD EC                  <1> 	in	al, dx ; blue
  5478 00002CFE B41C                <1> 	mov	ah, 28 ; 0.11 * Blue
  5479 00002D00 F6E4                <1> 	mul	ah
  5480 00002D02 665A                <1> 	pop	dx
  5481 00002D04 6601D0              <1> 	add	ax, dx
  5482 00002D07 665A                <1> 	pop	dx
  5483 00002D09 6601D0              <1> 	add	ax, dx
  5484 00002D0C 66058000            <1> 	add	ax, 80h  
  5485 00002D10 B03F                <1> 	mov	al, 3Fh
  5486 00002D12 38C4                <1> 	cmp	ah, al	; if(i>0x3f)i=0x3f
  5487 00002D14 7602                <1> 	jna	short g_s_s_2
  5488 00002D16 88C4                <1> 	mov	ah, al
  5489                              <1> g_s_s_2:
  5490 00002D18 66BAC803            <1> 	mov	dx, 3C8h  ; VGAREG_DAC_WRITE_ADDRESS
  5491 00002D1C 88D8                <1> 	mov	al, bl ; color index
  5492 00002D1E EE                  <1> 	out	dx, al
  5493 00002D1F 88E0                <1> 	mov	al, ah ; intensity
  5494 00002D21 6642                <1> 	inc	dx ; 3C9h ; VGAREG_DAC_DATA
  5495 00002D23 EE                  <1> 	out	dx, al ; R (R=G=B)
  5496 00002D24 88E0                <1> 	mov	al, ah ; intensity
  5497 00002D26 EE                  <1> 	out	dx, al ; G (R=G=B)
  5498 00002D27 88E0                <1>  	mov	al, ah ; intensity
  5499 00002D29 EE                  <1> 	out	dx, al ; B (R=G=B)
  5500 00002D2A 6649                <1> 	dec	cx
  5501 00002D2C 7404                <1> 	jz	short g_s_s_3
  5502 00002D2E FEC3                <1> 	inc	bl    ; next color index value
  5503 00002D30 EBB2                <1> 	jmp	short g_s_s_1
  5504                              <1> g_s_s_3:
  5505 00002D32 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5506 00002D36 EC                  <1> 	in	al, dx
  5507 00002D37 B020                <1> 	mov	al, 20h
  5508 00002D39 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5509 00002D3D EE                  <1> 	out	dx, al ; 20h -> set bit 5
  5510                              <1> 		        ; (after loading palette regs)	
  5511 00002D3E C3                  <1> 	retn
  5512                              <1> 
  5513                              <1> vga_write_char_attr:
  5514                              <1> vga_write_char_only: 
  5515                              <1> 	; 08/07/2016 (TRDOS 386 = TRDOS v2.0)
  5516                              <1> 	;
  5517                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5518                              <1> 	; vgabios-0.7a (2011)
  5519                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5520                              <1> 	; 'vgabios.c', 'biosfn_write_char_attr'
  5521                              <1> 	; 'biosfn_write_char_only'
  5522                              <1> 
  5523                              <1> 	; INPUT ->
  5524                              <1> 	; [CRT_MODE] = current video mode (>7)
  5525                              <1> 	; CX = Count of characters to write
  5526                              <1> 	; AL = Character to write
  5527                              <1> 	; BL = Color of character
  5528                              <1> 	; OUTPUT ->
  5529                              <1> 	; Regen buffer updated
  5530                              <1>  
  5531 00002D3F 8A25[BA6F0000]      <1> 	mov 	ah, [CRT_MODE]
  5532 00002D45 668B15[AE810100]    <1> 	mov	dx, [CURSOR_POSN] ; cursor pos for page 0
  5533                              <1> 
  5534 00002D4C BE[D66F0000]        <1> 	mov	esi, vga_modes
  5535 00002D51 89F7                <1> 	mov	edi, esi
  5536 00002D53 83C710              <1> 	add	edi, vga_mode_count
  5537                              <1> vga_wca_0:
  5538 00002D56 AC                  <1> 	lodsb
  5539 00002D57 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  5540 00002D59 7405                <1> 	je	short vga_wca_2
  5541 00002D5B 39FE                <1> 	cmp	esi, edi
  5542 00002D5D 72F7                <1> 	jb	short vga_wca_0
  5543                              <1> vga_wca_1:
  5544 00002D5F C3                  <1> 	retn	; nothing to do
  5545                              <1> vga_wca_2:
  5546 00002D60 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  5547                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  5548                              <1> 
  5549                              <1> 	; biosfn_write_char_attr (car,page,attr,count) 
  5550                              <1> 	; AL = car, page = 0, BL = attr, CX = count
  5551 00002D63 803E04              <1> 	cmp	byte [esi], PLANAR4
  5552 00002D66 741D                <1> 	je	short vga_wca_planar
  5553 00002D68 803E03              <1> 	cmp	byte [esi], PLANAR1
  5554 00002D6B 7418                <1> 	je	short vga_wca_planar
  5555                              <1> vga_wca_linear8:
  5556                              <1> 	; while((count-->0) && (xcurs<nbcols))
  5557                              <1> 	; CX = count
  5558 00002D6D 6621C9              <1> 	and	cx, cx
  5559 00002D70 74ED                <1> 	jz	short vga_wca_1
  5560 00002D72 3A15[BC6F0000]      <1> 	cmp	dl, [CRT_COLS]
  5561 00002D78 73E5                <1> 	jnb	short vga_wca_1
  5562                              <1> 	; write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols);
  5563                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  5564                              <1> 	; [CRT_COLS] = nbcols
  5565 00002D7A E81E000000          <1> 	call	write_gfx_char_lin	 
  5566 00002D7F 6649                <1> 	dec	cx ; count
  5567 00002D81 FEC2                <1> 	inc	dl ; xcurs
  5568 00002D83 EBE8                <1> 	jmp	short vga_wca_linear8
  5569                              <1> vga_wca_planar:
  5570                              <1> 	; while((count-->0) && (xcurs<nbcols))
  5571                              <1> 	; CX = count
  5572 00002D85 6621C9              <1> 	and	cx, cx
  5573 00002D88 74D5                <1> 	jz	short vga_wca_1
  5574 00002D8A 3A15[BC6F0000]      <1> 	cmp	dl, [CRT_COLS]
  5575 00002D90 73CD                <1> 	jnb	short vga_wca_1
  5576                              <1> 	; write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight);
  5577                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  5578                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  5579 00002D92 E8A9000000          <1> 	call	write_gfx_char_pl4
  5580 00002D97 6649                <1> 	dec	cx ; count
  5581 00002D99 FEC2                <1> 	inc	dl ; xcurs
  5582 00002D9B EBE8                <1> 	jmp	short vga_wca_planar
  5583                              <1> 
  5584                              <1> write_gfx_char_lin:
  5585                              <1> 	; 08/01/2021
  5586                              <1> 	; 05/01/2021 (TRDOS 386 v2.0.3)
  5587                              <1> 	; 08/08/2016
  5588                              <1> 	; 31/07/2016
  5589                              <1> 	; 08/07/2016 (TRDOS 386 = TRDOS v2.0)
  5590                              <1> 	;
  5591                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5592                              <1> 	; vgabios-0.7a (2011)
  5593                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5594                              <1> 	; 'vgabios.c', 'write_gfx_char_lin'
  5595                              <1> 
  5596                              <1> 	; write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols)
  5597                              <1> 	; INPUT ->
  5598                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  5599                              <1> 	; [CRT_COLS] = nbcols
  5600                              <1> 	; OUTPUT ->
  5601                              <1> 	; Regen buffer updated
  5602                              <1> 
  5603 00002D9D 51                  <1> 	push	ecx
  5604 00002D9E 53                  <1> 	push	ebx
  5605 00002D9F 52                  <1> 	push	edx
  5606 00002DA0 50                  <1> 	push	eax
  5607                              <1> 	; addr=xcurs*8+ycurs*nbcols*64;
  5608                              <1> 	; 08/08/2016
  5609 00002DA1 0FB6F0              <1> 	movzx	esi, al ; car
  5610                              <1> 	; 08/01/2021
  5611                              <1> 	;movzx	eax, dh ; ycurs
  5612                              <1> 	;mov	ah, [CRT_COLS] ; nbcols
  5613                              <1> 	;mul	ah
  5614 00002DA4 A0[BC6F0000]        <1> 	mov	al, [CRT_COLS]
  5615 00002DA9 F6E6                <1> 	mul	dh
  5616                              <1> 	;shl	ax, 6 ; * 64
  5617 00002DAB 66C1E003            <1>  	shl	ax, 3 ; 8 * ycurs * [CRT_COLS]
  5618                              <1> 	;sub	dh, dh
  5619                              <1> 	;shl	dx, 3 ; xcurs * 8
  5620                              <1> 	;movzx	edi, dx
  5621 00002DAF BF00000A00          <1> 	mov	edi, 0A0000h
  5622 00002DB4 30F6                <1> 	xor	dh, dh
  5623 00002DB6 6689D7              <1> 	mov	di, dx
  5624                              <1> 	;movzx	edi, dl
  5625 00002DB9 66C1E703            <1> 	shl	di, 3 ; xcurs * 8
  5626                              <1> 	;xor	dh, dh
  5627 00002DBD 8A15[BE6F0000]      <1> 	mov	dl, [CHAR_HEIGHT]
  5628 00002DC3 66F7E2              <1> 	mul	dx
  5629                              <1> 	; eax = ycurs*nbcols*8*[CHAR_HEIGHT]
  5630                              <1> 	;add	edi, eax ; addr
  5631                              <1> 	;add	edi, 0A0000h
  5632 00002DC6 6601C7              <1> 	add	di, ax
  5633                              <1> 	;shl	si, 3 ; car * 8
  5634 00002DC9 30E4                <1> 	xor	ah, ah
  5635 00002DCB A0[BE6F0000]        <1> 	mov	al, [CHAR_HEIGHT]
  5636 00002DD0 66F7E6              <1> 	mul	si
  5637 00002DD3 6689C6              <1> 	mov	si, ax
  5638                              <1> 	;; esi = src = car * 8
  5639                              <1> 	; esi = src = car * [CHAR_HEIGHT]
  5640                              <1> 	; i = 0
  5641                              <1> 	;add	esi, vgafont8 ; fdata [src+i]
  5642                              <1> 	; 08/08/2016
  5643 00002DD6 A1[3A8E0100]        <1> 	mov	eax, [VGA_INT43H]
  5644 00002DDB 09C0                <1> 	or	eax, eax ; 0 ?
  5645 00002DDD 743F                <1> 	jz	short wfxl_7 ; yes, default font
  5646                              <1> 	;cmp	eax, vgafont16
  5647                              <1>         ;je	short wgfxl_0
  5648                              <1> 	;cmp	eax, vgafont14
  5649                              <1> 	;je	short wgfxl_0
  5650                              <1> 	;cmp	eax, vgafont8
  5651                              <1> 	;je	short wgfxl_0
  5652                              <1> 	;; 05/01/2021 (TRDOS 386 v2.0.3)
  5653                              <1> 	;; user font  
  5654                              <1> 	;mov	eax, VGAFONTUSR ; 8x16 or 8x8 or 8x14 font
  5655                              <1> 	;			; (256 characters)
  5656                              <1> wgfxl_0:
  5657 00002DDF 01C6                <1> 	add	esi, eax
  5658                              <1> wgfxl_1:
  5659 00002DE1 28FF                <1> 	sub	bh, bh ; i = 0
  5660                              <1> wgfxl_2:
  5661                              <1> 	; for(i=0;i<8;i++)
  5662 00002DE3 57                  <1> 	push	edi ; addr
  5663 00002DE4 0FB605[BC6F0000]    <1> 	movzx	eax, byte [CRT_COLS] ; nbcols
  5664 00002DEB F6E7                <1> 	mul	bh ; nbcols*i
  5665 00002DED 66C1E003            <1> 	shl	ax, 3 ; i*nbcols*8
  5666                              <1>  	; dest=addr+i*nbcols*8;
  5667 00002DF1 01C7                <1> 	add	edi, eax ; dest + j ; j = 0
  5668 00002DF3 B180                <1> 	mov	cl, 80h ; mask = 0x80;
  5669                              <1> 	; esi = fdata + src + i
  5670                              <1> 	; for(j=0;j<8;j++)
  5671 00002DF5 29D2                <1> 	sub	edx, edx ; j = 0
  5672                              <1> wgfxl_3:
  5673 00002DF7 8A06                <1> 	mov	al, [esi] ; al = fdata[src+i]
  5674 00002DF9 20C8                <1> 	and	al, cl ; if (fdata[src+i] & mask)
  5675 00002DFB 7402                <1> 	jz	short wgfxl_4  ; data = 0, zf = 1
  5676 00002DFD 88D8                <1> 	mov	al, bl ; data = attr;
  5677                              <1> wgfxl_4:
  5678                              <1> 	; write_byte(0xa000,dest+j,data);		
  5679 00002DFF AA                  <1> 	stosb  ; dest + j (+ 0A0000h)
  5680                              <1> 	;inc	dl ; j++
  5681                              <1> 	;cmp	dl, 8
  5682 00002E00 80FA07              <1> 	cmp	dl, 7
  5683 00002E03 720E                <1> 	jb	short wgfxl_5
  5684 00002E05 5F                  <1> 	pop	edi
  5685                              <1> 	; 08/08/2016
  5686                              <1> 	;cmp	bh, 7
  5687                              <1> 	;jnb	short wgfxl_6
  5688 00002E06 FEC7                <1> 	inc	bh ; i++
  5689 00002E08 3A3D[BE6F0000]      <1> 	cmp	bh, [CHAR_HEIGHT]
  5690 00002E0E 7309                <1> 	jnb	short wgfxl_6
  5691 00002E10 46                  <1> 	inc	esi
  5692 00002E11 EBD0                <1> 	jmp	short wgfxl_2
  5693                              <1> wgfxl_5:
  5694 00002E13 D0E9                <1> 	shr	cl, 1 ; mask >>= 1;
  5695 00002E15 FEC2                <1> 	inc	dl ; j++
  5696 00002E17 EBDE                <1>         jmp     short wgfxl_3
  5697                              <1> wgfxl_6:
  5698 00002E19 58                  <1> 	pop	eax
  5699 00002E1A 5A                  <1> 	pop	edx
  5700 00002E1B 5B                  <1> 	pop	ebx
  5701 00002E1C 59                  <1> 	pop	ecx
  5702 00002E1D C3                  <1> 	retn
  5703                              <1> wfxl_7:
  5704                              <1> 	; 08/01/2021
  5705                              <1> 	; 05/01/2021
  5706                              <1> 	; Default font (8x8 or 8x14 or 8x16)
  5707 00002E1E A0[BE6F0000]        <1> 	mov	al, [CHAR_HEIGHT]
  5708 00002E23 3C08                <1> 	cmp	al, 8
  5709 00002E25 7507                <1> 	jne	short wfxl_8
  5710 00002E27 B8[24580100]        <1> 	mov	eax, vgafont8
  5711 00002E2C EBB1                <1> 	jmp	short wgfxl_0
  5712                              <1> wfxl_8:
  5713 00002E2E 3C0E                <1> 	cmp	al, 14
  5714 00002E30 7507                <1> 	jne	short wfxl_9
  5715 00002E32 B8[24600100]        <1> 	mov	eax, vgafont14
  5716 00002E37 EBA6                <1> 	jmp	short wgfxl_0
  5717                              <1> wfxl_9:
  5718 00002E39 B8[246E0100]        <1> 	mov	eax, vgafont16
  5719 00002E3E EB9F                <1> 	jmp	short wgfxl_0
  5720                              <1> 
  5721                              <1> write_gfx_char_pl4:
  5722                              <1> 	; 08/08/2016
  5723                              <1> 	; 08/07/2016 (TRDOS 386 = TRDOS v2.0)
  5724                              <1> 	;
  5725                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5726                              <1> 	; vgabios-0.7a (2011)
  5727                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5728                              <1> 	; 'vgabios.c', 'write_gfx_char_pl4'
  5729                              <1> 
  5730                              <1> 	; write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight)
  5731                              <1> 	; INPUT ->
  5732                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  5733                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  5734                              <1> 	; OUTPUT ->
  5735                              <1> 	; Regen buffer updated
  5736                              <1> 
  5737 00002E40 51                  <1> 	push	ecx
  5738 00002E41 53                  <1> 	push	ebx
  5739 00002E42 52                  <1> 	push	edx
  5740 00002E43 50                  <1> 	push	eax
  5741                              <1> wgfxpl_f0:
  5742                              <1> 	; switch(cheight)
  5743 00002E44 8A25[BE6F0000]      <1> 	mov	ah, [CHAR_HEIGHT]
  5744 00002E4A 80FC10              <1> 	cmp	ah, 16 ; case 16:
  5745 00002E4D 7507                <1> 	jne	short wgfxpl_f1
  5746                              <1> 	; fdata = &vgafont16;
  5747 00002E4F BE[246E0100]        <1> 	mov	esi, vgafont16
  5748 00002E54 EB13                <1> 	jmp	short wgfxpl_f3
  5749                              <1> wgfxpl_f1:
  5750 00002E56 80FC0E              <1> 	cmp	ah, 14 ; case 14:
  5751 00002E59 7507                <1> 	jne	short wgfxpl_f2
  5752 00002E5B BE[24600100]        <1> 	mov	esi, vgafont14
  5753 00002E60 EB07                <1> 	jmp	short wgfxpl_f3
  5754                              <1> wgfxpl_f2:
  5755                              <1> 	; default:
  5756                              <1> 	;  fdata = &vgafont8;
  5757 00002E62 BE[24580100]        <1> 	mov	esi, vgafont8
  5758 00002E67 B408                <1> 	mov	ah, 8	
  5759                              <1> wgfxpl_f3:
  5760                              <1> 	; al = car
  5761 00002E69 F6E4                <1> 	mul	ah ; ah = cheight
  5762 00002E6B 25FFFF0000          <1> 	and	eax, 0FFFFh ; car * cheight
  5763                              <1> 	; src = car * cheight;
  5764 00002E70 01C6                <1> 	add	esi, eax ; esi = fdata[src+i]
  5765                              <1> 	; addr=xcurs*8+ycurs*nbcols*64;
  5766 00002E72 88F0                <1> 	mov	al, dh ; ycurs
  5767 00002E74 8A25[BC6F0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  5768 00002E7A F6E4                <1> 	mul	ah
  5769                              <1> 	; 08/08/2016
  5770                              <1> 	;shl	ax, 6 ; * 64
  5771 00002E7C 66C1E003            <1> 	shl	ax, 3 ; * 8
  5772                              <1> 	;sub	dh, dh ; 0
  5773                              <1> 	;shl	dx, 3 ; xcurs * 8
  5774                              <1> 	;movzx	edi, dx
  5775 00002E80 0FB6FA              <1> 	movzx	edi, dl
  5776 00002E83 66C1E703            <1> 	shl	di, 3 ; xcurs * 8
  5777 00002E87 30F6                <1> 	xor	dh, dh
  5778 00002E89 8A15[BE6F0000]      <1> 	mov	dl, [CHAR_HEIGHT]
  5779 00002E8F 66F7E2              <1> 	mul	dx
  5780                              <1> 	; eax = ycurs*nbcols*8*[CHAR_HEIGHT]
  5781 00002E92 01C7                <1> 	add	edi, eax ; addr
  5782 00002E94 81C700000A00        <1> 	add	edi, 0A0000h
  5783                              <1> 	;
  5784                              <1> 	; outw(VGAREG_SEQU_ADDRESS, 0x0f02);
  5785                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205);
  5786 00002E9A 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  5787 00002E9E 66B8020F            <1> 	mov	ax, 0F02h
  5788 00002EA2 66EF                <1> 	out	dx, ax
  5789 00002EA4 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  5790 00002EA8 66B80502            <1> 	mov	ax, 0205h
  5791 00002EAC 66EF                <1> 	out	dx, ax
  5792                              <1> 	;
  5793 00002EAE 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  5794 00002EB2 F6C380              <1> 	test	bl, 80h ; if(attr&0x80)
  5795 00002EB5 7406                <1> 	jz	short wgfxpl_f4 ; else
  5796                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x1803);
  5797 00002EB7 66B80318            <1> 	mov	ax, 1803h
  5798 00002EBB EB04                <1> 	jmp	short wgfxpl_f5
  5799                              <1> wgfxpl_f4:
  5800                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0003);
  5801 00002EBD 66B80300            <1> 	mov	ax, 0003h	
  5802                              <1> wgfxpl_f5:
  5803 00002EC1 66EF                <1> 	out	dx, ax
  5804                              <1> 	;	
  5805 00002EC3 28FF                <1> 	sub	bh, bh ; i = 0
  5806                              <1> wgfxpl_0:
  5807                              <1> 	; for(i=0;i<cheight;i++)
  5808 00002EC5 57                  <1> 	push	edi ; addr
  5809 00002EC6 0FB605[BC6F0000]    <1> 	movzx	eax, byte [CRT_COLS] ; nbcols
  5810 00002ECD F6E7                <1> 	mul	bh ; nbcols*i
  5811                              <1> 	; dest=addr+i*nbcols
  5812 00002ECF 01C7                <1> 	add	edi, eax ; dest
  5813 00002ED1 B580                <1> 	mov	ch, 80h ; mask = 0x80;
  5814                              <1> 	; for(j=0;j<8;j++)
  5815 00002ED3 28C9                <1> 	sub	cl, cl ; j = 0
  5816                              <1> wgfxpl_1:
  5817 00002ED5 D2ED                <1> 	shr	ch, cl ; mask=0x80>>j;
  5818                              <1> 	;
  5819                              <1> 	; outw(VGAREG_GRDC_ADDRESS, (mask << 8) | 0x08);
  5820                              <1>      	; read_byte(0xa000,dest);
  5821                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  5822 00002ED7 88EC                <1> 	mov	ah, ch
  5823 00002ED9 B008                <1> 	mov	al, 8
  5824 00002EDB 66EF                <1> 	out	dx, ax
  5825 00002EDD 8A07                <1> 	mov	al, [edi] ; ? (io delay?)
  5826                              <1> 	;
  5827 00002EDF 28C0                <1> 	sub	al, al ; attr = 0
  5828                              <1> 	; if (fdata[src+i] & mask)
  5829 00002EE1 842E                <1> 	test	byte [esi], ch
  5830 00002EE3 7404                <1> 	jz	short wgfxpl_2  ; zf = 1
  5831                              <1> 	; write_byte(0xa000,dest,attr&0x0f);
  5832 00002EE5 88D8                <1> 	mov	al, bl ; attr;
  5833 00002EE7 240F                <1> 	and	al, 0Fh	; attr&0x0f
  5834                              <1> wgfxpl_2:
  5835                              <1> 	; write_byte(0xa000,dest,0x00);		
  5836 00002EE9 8807                <1> 	mov	[edi], al ; dest (+ 0A0000h)
  5837 00002EEB FEC1                <1> 	inc	cl ; j++
  5838 00002EED 80F908              <1> 	cmp	cl, 8
  5839 00002EF0 72E3                <1> 	jb	short wgfxpl_1
  5840 00002EF2 5F                  <1> 	pop	edi
  5841                              <1> 	; 08/08/2016
  5842                              <1> 	;cmp	bh, 7
  5843                              <1> 	;jnb	short wgfxpl_3
  5844 00002EF3 FEC7                <1> 	inc	bh ; i++
  5845 00002EF5 3A3D[BE6F0000]      <1> 	cmp	bh, [CHAR_HEIGHT]
  5846 00002EFB 7303                <1> 	jnb	short wgfxpl_3
  5847 00002EFD 46                  <1> 	inc	esi
  5848 00002EFE EBC5                <1> 	jmp	short wgfxpl_0
  5849                              <1> wgfxpl_3:
  5850                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  5851 00002F00 66B808FF            <1>   	mov	ax, 0FF08h
  5852 00002F04 66EF                <1> 	out	dx, ax
  5853 00002F06 66B80500            <1> 	mov	ax, 0005h
  5854 00002F0A 66EF                <1> 	out	dx, ax
  5855 00002F0C 66B80300            <1> 	mov	ax, 0003h
  5856 00002F10 66EF                <1> 	out	dx, ax
  5857                              <1> 	;
  5858 00002F12 58                  <1> 	pop	eax
  5859 00002F13 5A                  <1> 	pop	edx
  5860 00002F14 5B                  <1> 	pop	ebx
  5861 00002F15 59                  <1> 	pop	ecx
  5862 00002F16 C3                  <1> 	retn
  5863                              <1> 
  5864                              <1> vga_write_pixel: 
  5865                              <1> 	; 09/07/2016 (TRDOS 386 = TRDOS v2.0)
  5866                              <1> 	;
  5867                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5868                              <1> 	; vgabios-0.7a (2011)
  5869                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5870                              <1> 	; 'vgabios.c', 'biosfn_write_pixel'
  5871                              <1> 
  5872                              <1> 	; INPUT ->
  5873                              <1> 	; 	DX = row (0-239)
  5874                              <1> 	; 	CX = column (0-799)
  5875                              <1> 	; 	AL = pixel value
  5876                              <1> 	;	(AH = [CRT_MODE])
  5877                              <1> 	; OUTPUT ->
  5878                              <1> 	; 	none
  5879                              <1>  
  5880 00002F17 88C3                <1> 	mov	bl, al ; pixel value
  5881                              <1> 	;mov 	ah, [CRT_MODE]
  5882 00002F19 BE[D66F0000]        <1> 	mov	esi, vga_modes
  5883 00002F1E 89F7                <1> 	mov	edi, esi
  5884 00002F20 83C710              <1> 	add	edi, vga_mode_count
  5885                              <1> vga_wp_0:
  5886 00002F23 AC                  <1> 	lodsb
  5887 00002F24 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  5888 00002F26 7405                <1> 	je	short vga_wp_1
  5889 00002F28 39FE                <1> 	cmp	esi, edi
  5890 00002F2A 72F7                <1> 	jb	short vga_wp_0
  5891 00002F2C C3                  <1> 	retn	; nothing to do
  5892                              <1> vga_wp_1:
  5893 00002F2D 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  5894                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  5895 00002F30 BF00000A00          <1> 	mov	edi, 0A0000h
  5896                              <1> 	;
  5897 00002F35 803E04              <1> 	cmp	byte [esi], PLANAR4
  5898 00002F38 741D                <1> 	je	short vga_wp_planar
  5899 00002F3A 803E03              <1> 	cmp	byte [esi], PLANAR1
  5900 00002F3D 7418                <1> 	je	short vga_wp_planar
  5901                              <1> vga_wp_linear8:
  5902                              <1> 	; addr=CX+DX*(read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8);
  5903 00002F3F 0FB605[BC6F0000]    <1> 	movzx	eax, byte [CRT_COLS] ; = [VGA_COLS] ; nbcols
  5904 00002F46 66C1E003            <1>      	shl	ax, 3 ; * 8
  5905 00002F4A 66F7E2              <1> 	mul	dx
  5906 00002F4D 50                  <1> 	push	eax
  5907                              <1> 	;mov	edi, 0A0000h
  5908 00002F4E 6601CF              <1> 	add	di, cx
  5909 00002F51 58                  <1> 	pop	eax
  5910 00002F52 01C7                <1> 	add	edi, eax ; addr
  5911                              <1> 	; write_byte(0xa000,addr,AL);
  5912 00002F54 881F                <1> 	mov	[edi], bl
  5913 00002F56 C3                  <1> 	retn    
  5914                              <1> vga_wp_planar:
  5915                              <1> 	; addr = CX/8+DX*read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
  5916 00002F57 0FB7C1              <1> 	movzx	eax, cx
  5917 00002F5A 66C1E803            <1> 	shr	ax, 3 ; CX/8
  5918 00002F5E 50                  <1> 	push	eax
  5919 00002F5F 28E4                <1> 	sub	ah, ah ; 0
  5920 00002F61 A0[BC6F0000]        <1> 	mov	al, [CRT_COLS] ; = [VGA_COLS] ; nbcols
  5921 00002F66 66F7E2              <1> 	mul	dx
  5922                              <1> 	;mov	edi, 0A0000h
  5923 00002F69 6601C7              <1>         add     di, ax
  5924 00002F6C 58                  <1> 	pop	eax
  5925 00002F6D 01C7                <1> 	add	edi, eax ; addr
  5926 00002F6F 80E107              <1> 	and	cl, 7
  5927 00002F72 B580                <1> 	mov	ch, 80h ; mask
  5928 00002F74 D2ED                <1> 	shr	ch, cl 	; mask = 0x80 >> (CX & 0x07);
  5929                              <1> 	
  5930                              <1> 	; outw(VGAREG_GRDC_ADDRESS, (mask << 8) | 0x08);
  5931 00002F76 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  5932 00002F7A 88EC                <1> 	mov	ah, ch
  5933 00002F7C B008                <1> 	mov	al, 8
  5934 00002F7E 66EF                <1> 	out	dx, ax
  5935                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205);
  5936 00002F80 66B80502            <1> 	mov	ax, 0205h
  5937 00002F84 66EF                <1> 	out	dx, ax
  5938                              <1> 	; data = read_byte(0xa000,addr);
  5939 00002F86 8A07                <1> 	mov	al, [edi] ; (delay?)	
  5940                              <1> 	; if (AL & 0x80)
  5941                              <1> 	; {
  5942                              <1> 	;  outw(VGAREG_GRDC_ADDRESS, 0x1803);
  5943                              <1> 	; }
  5944 00002F88 F6C380              <1> 	test	bl, 80h
  5945 00002F8B 7406                <1> 	jz	short vga_wp_2
  5946 00002F8D 66B80318            <1> 	mov	ax, 1803h
  5947 00002F91 66EF                <1> 	out	dx, ax
  5948                              <1> vga_wp_2:	
  5949                              <1> 	; write_byte(0xa000,addr,AL);
  5950 00002F93 881F                <1> 	mov	[edi], bl
  5951                              <1> 	;
  5952                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  5953 00002F95 66B808FF            <1>   	mov	ax, 0FF08h
  5954 00002F99 66EF                <1> 	out	dx, ax
  5955 00002F9B 66B80500            <1> 	mov	ax, 0005h
  5956 00002F9F 66EF                <1> 	out	dx, ax
  5957 00002FA1 66B80300            <1> 	mov	ax, 0003h
  5958 00002FA5 66EF                <1> 	out	dx, ax
  5959                              <1> 	;
  5960 00002FA7 C3                  <1> 	retn
  5961                              <1> 
  5962                              <1> vga_read_pixel: 
  5963                              <1> 	; 09/07/2016 (TRDOS 386 = TRDOS v2.0)
  5964                              <1> 	;
  5965                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5966                              <1> 	; vgabios-0.7a (2011)
  5967                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5968                              <1> 	; 'vgabios.c', 'biosfn_read_pixel'
  5969                              <1> 
  5970                              <1> 	; INPUT ->
  5971                              <1> 	; 	DX = row (0-239)
  5972                              <1> 	; 	CX = column (0-799)
  5973                              <1> 	;	(AH = [CRT_MODE])
  5974                              <1> 	; OUTPUT ->
  5975                              <1> 	; 	AL = pixel value
  5976                              <1> 	 
  5977                              <1> 	;mov 	ah, [CRT_MODE]
  5978 00002FA8 BE[D66F0000]        <1> 	mov	esi, vga_modes
  5979 00002FAD 89F7                <1> 	mov	edi, esi
  5980 00002FAF 83C710              <1> 	add	edi, vga_mode_count
  5981                              <1> vga_rp_0:
  5982 00002FB2 AC                  <1> 	lodsb
  5983 00002FB3 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  5984 00002FB5 7405                <1> 	je	short vga_rp_1
  5985 00002FB7 39FE                <1> 	cmp	esi, edi
  5986 00002FB9 72F7                <1> 	jb	short vga_rp_0
  5987 00002FBB C3                  <1> 	retn	; nothing to do
  5988                              <1> vga_rp_1:
  5989 00002FBC 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  5990                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  5991 00002FBF BF00000A00          <1> 	mov	edi, 0A0000h
  5992                              <1> 	;
  5993 00002FC4 803E04              <1> 	cmp	byte [esi], PLANAR4
  5994 00002FC7 741D                <1> 	je	short vga_rp_planar
  5995 00002FC9 803E03              <1> 	cmp	byte [esi], PLANAR1
  5996 00002FCC 7418                <1> 	je	short vga_rp_planar
  5997                              <1> vga_rp_linear8:
  5998                              <1> 	; addr=CX+DX*(read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8);
  5999 00002FCE 0FB605[BC6F0000]    <1> 	movzx	eax, byte [CRT_COLS] ; = [VGA_COLS] ; nbcols
  6000 00002FD5 66C1E003            <1>      	shl	ax, 3 ; * 8
  6001 00002FD9 66F7E2              <1> 	mul	dx
  6002 00002FDC 50                  <1> 	push	eax
  6003                              <1> 	;mov	edi, 0A0000h
  6004 00002FDD 6601CF              <1> 	add	di, cx
  6005 00002FE0 58                  <1> 	pop	eax
  6006 00002FE1 01C7                <1> 	add	edi, eax ; addr
  6007                              <1> 	; attr=read_byte(0xa000,addr);
  6008 00002FE3 8A07                <1> 	mov	al, [edi] ; pixel value
  6009 00002FE5 C3                  <1> 	retn    
  6010                              <1> vga_rp_planar:
  6011                              <1> 	; addr = CX/8+DX*read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
  6012 00002FE6 0FB7C1              <1> 	movzx	eax, cx
  6013 00002FE9 66C1E803            <1> 	shr	ax, 3 ; CX/8
  6014 00002FED 50                  <1> 	push	eax
  6015 00002FEE 28E4                <1> 	sub	ah, ah ; 0
  6016 00002FF0 A0[BC6F0000]        <1> 	mov	al, [CRT_COLS] ; = [VGA_COLS] ; nbcols
  6017 00002FF5 66F7E2              <1> 	mul	dx
  6018                              <1> 	;mov	edi, 0A0000h
  6019 00002FF8 6601C7              <1>         add     di, ax
  6020 00002FFB 58                  <1> 	pop	eax
  6021 00002FFC 01C7                <1> 	add	edi, eax ; addr
  6022 00002FFE 80E107              <1> 	and	cl, 7
  6023 00003001 B580                <1> 	mov	ch, 80h ; mask
  6024 00003003 D2ED                <1> 	shr	ch, cl 	; mask = 0x80 >> (CX & 0x07);
  6025                              <1> 	; attr = 0x00;
  6026 00003005 30DB                <1> 	xor	bl, bl ; attr = bl = 0, 
  6027 00003007 30C9                <1> 	xor	cl, cl ; i = cl = 0
  6028                              <1> 	; for(i=0;i<4;i++)
  6029                              <1>       	; {
  6030                              <1>        	;  outw(VGAREG_GRDC_ADDRESS, (i << 8) | 0x04);
  6031                              <1>        	;  data = read_byte(0xa000,addr) & mask;
  6032                              <1>        	;  if (data > 0) attr |= (0x01 << i);
  6033                              <1>       	; }
  6034                              <1> vga_rp_2:
  6035 00003009 88CC                <1> 	mov	ah, cl ; i << 8
  6036 0000300B B004                <1> 	mov	al, 4  ; | 0x04
  6037 0000300D 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  6038 00003011 66EF                <1> 	out	dx, ax
  6039                              <1> 	; data = read_byte(0xa000,addr) & mask;
  6040 00003013 8A07                <1> 	mov	al, [edi]
  6041 00003015 20E8                <1> 	and	al, ch ; & mask
  6042                              <1> 	; if (data > 0) attr |= (0x01 << i);
  6043 00003017 08C0                <1> 	or	al, al
  6044 00003019 7408                <1> 	jz	short vga_rp_3 ; al = 0 
  6045 0000301B B701                <1> 	mov	bh, 1
  6046 0000301D D2E7                <1> 	shl	bh, cl ; (0x01 << i)
  6047 0000301F 08FB                <1> 	or	bl, bh ; attr |= (0x01 << i)
  6048 00003021 88D8                <1> 	mov	al, bl ; pixel value	
  6049                              <1> vga_rp_3:	
  6050 00003023 C3                  <1> 	retn
  6051                              <1> 
  6052                              <1> vga_beeper:
  6053                              <1> 	; 04/08/2016  (TRDOS 386 = TRDOS v2.0)
  6054 00003024 FB                  <1> 	sti
  6055                              <1> 	;mov	bh, [ACTIVE_PAGE]
  6056 00003025 E9C0F3FFFF          <1>         jmp     beeper_gfx
  6057                              <1> 
  6058                              <1> vga_write_teletype:
  6059                              <1> 	; 09/12/2017
  6060                              <1> 	; 06/08/2016
  6061                              <1> 	; 04/08/2016
  6062                              <1> 	; 01/08/2016
  6063                              <1> 	; 31/07/2016
  6064                              <1> 	; 09/07/2016 (TRDOS 386 = TRDOS v2.0)
  6065                              <1> 	;
  6066                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  6067                              <1> 	; vgabios-0.7a (2011)
  6068                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  6069                              <1> 	; 'vgabios.c', 'biosfn_write_teletype'
  6070                              <1> 	; 'biosfn_write_char_only'
  6071                              <1> 
  6072                              <1> 	; INPUT ->
  6073                              <1> 	; [CRT_MODE] = current video mode (>7)
  6074                              <1> 	; AL = Character to write
  6075                              <1> 	; BL = Color of character
  6076                              <1> 	; OUTPUT ->
  6077                              <1> 	; Regen buffer updated
  6078                              <1> 
  6079                              <1> 	; biosfn_write_teletype (car, page, attr, flag) 
  6080                              <1> 	; car = character (AL)
  6081                              <1> 	; page = 0
  6082                              <1> 	; attr = color (BL)
  6083                              <1> 	; 'flag' not used
  6084                              <1> 
  6085 0000302A 8A25[BA6F0000]      <1> 	mov 	ah, [CRT_MODE]
  6086 00003030 88C7                <1> 	mov	bh, al ; character
  6087 00003032 668B15[AE810100]    <1> 	mov	dx, [CURSOR_POSN] ; cursor pos for page 0
  6088                              <1> 
  6089 00003039 BE[DE6F0000]        <1> 	mov	esi, vga_g_modes
  6090 0000303E 89F7                <1> 	mov	edi, esi
  6091 00003040 83C708              <1> 	add	edi, vga_g_mode_count
  6092                              <1> vga_wtty_0:
  6093 00003043 AC                  <1> 	lodsb
  6094 00003044 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  6095 00003046 7405                <1> 	je	short vga_wtty_2
  6096 00003048 39FE                <1> 	cmp	esi, edi
  6097 0000304A 72F7                <1> 	jb	short vga_wtty_0
  6098                              <1> vga_wtty_1:
  6099 0000304C C3                  <1> 	retn	; nothing to do
  6100                              <1> vga_wtty_2:
  6101 0000304D 80FF07              <1> 	cmp	bh, 07h ; bell (beep)
  6102 00003050 74D2                <1> 	je	short vga_beeper  ; u11
  6103 00003052 80FF08              <1> 	cmp	bh, 08h ; backspace
  6104 00003055 7508                <1> 	jne	short vga_wtty_3
  6105                              <1> 	; if(xcurs>0)xcurs--;
  6106 00003057 08D2                <1> 	or	dl, dl ; xcurs (column)
  6107 00003059 74F1                <1> 	jz	short vga_wtty_1
  6108 0000305B FECA                <1> 	dec	dl ; xcurs--;
  6109 0000305D EB59                <1>         jmp     short vga_wtty_12 
  6110                              <1> vga_wtty_3:			
  6111 0000305F 80FF0D              <1> 	cmp	bh, 0Dh ; carriage return (\r)
  6112 00003062 7504                <1> 	jne	short vga_wtty_4
  6113                              <1> 	; xcurs=0;
  6114 00003064 28D2                <1> 	sub	dl, dl ; 0
  6115 00003066 EB50                <1>         jmp     short vga_wtty_12 
  6116                              <1> vga_wtty_4:	
  6117 00003068 80FF0A              <1> 	cmp	bh, 0Ah ; new line (\n)
  6118 0000306B 7504                <1> 	jne	short vga_wtty_5
  6119                              <1> 	; ycurs++;
  6120 0000306D FEC6                <1> 	inc	dh ; next row
  6121 0000306F EB62                <1>         jmp     short vga_wtty_11
  6122                              <1> vga_wtty_5:
  6123 00003071 80FF09              <1> 	cmp 	bh, 09h ; tab stop
  6124 00003074 7527                <1> 	jne	short vga_wtty_8
  6125 00003076 88D0                <1> 	mov	al, dl
  6126                              <1> 	;cbw
  6127 00003078 30E4                <1> 	xor	ah, ah ; 09/12/2017
  6128 0000307A B108                <1> 	mov	cl, 8
  6129 0000307C F6F1                <1> 	div	cl
  6130 0000307E 28E1                <1> 	sub	cl, ah
  6131                              <1> 	;
  6132 00003080 B720                <1> 	mov	bh, 20h ; space
  6133                              <1> vga_wtty_6: ; tab stop loop
  6134 00003082 6651                <1> 	push	cx
  6135 00003084 6653                <1> 	push	bx
  6136 00003086 E812000000          <1> 	call	vga_wtty_8
  6137 0000308B 665B                <1> 	pop	bx  ; bh = character, bl = color
  6138 0000308D 6659                <1> 	pop	cx
  6139 0000308F FEC9                <1> 	dec	cl
  6140 00003091 7409                <1> 	jz	short vga_wtty_7
  6141 00003093 668B15[AE810100]    <1> 	mov	dx, [CURSOR_POSN] ; new cursor position (pg 0)
  6142 0000309A EBE6                <1> 	jmp	short vga_wtty_6
  6143                              <1> vga_wtty_7:
  6144 0000309C C3                  <1> 	retn
  6145                              <1> 	;
  6146                              <1> vga_wtty_8:
  6147 0000309D 83C64F              <1> 	add	esi, vga_g_memmodel - (vga_g_modes + 1)  
  6148                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  6149 000030A0 BF00000A00          <1> 	mov	edi, 0A0000h
  6150                              <1> 	;
  6151 000030A5 88F8                <1> 	mov	al, bh ; character
  6152                              <1> 	;
  6153 000030A7 803E04              <1> 	cmp	byte [esi], PLANAR4
  6154 000030AA 7414                <1> 	je	short vga_wtty_planar
  6155 000030AC 803E03              <1> 	cmp	byte [esi], PLANAR1
  6156 000030AF 740F                <1> 	je	short vga_wtty_planar
  6157                              <1> vga_wtty_linear8:
  6158                              <1> 	; write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols);
  6159                              <1> 	; AL = car, BL = attr (color), DL = xcurs, DH = ycurs, 
  6160                              <1> 	; [CRT_COLS] = nbcols
  6161 000030B1 E8E7FCFFFF          <1> 	call	write_gfx_char_lin
  6162 000030B6 EB0D                <1> 	jmp	short vga_wtty_9
  6163                              <1> 
  6164                              <1> vga_wtty_12:
  6165                              <1> 	; 09/07/2016
  6166                              <1> 	; set cursor position
  6167                              <1> 	; NOTE: Hardware cursor position will not be set
  6168                              <1> 	;   in any VGA modes (>7)
  6169                              <1> 	;   But, cursor position will be saved into
  6170                              <1> 	;   [CURSOR_POSN].
  6171                              <1> 	;   TRDOS 386 (TRDOS v2.0) uses only one page
  6172                              <1> 	;   (page 0) for all graphics modes.
  6173                              <1> 
  6174 000030B8 668915[AE810100]    <1> 	mov	[CURSOR_POSN], dx ; save cursor pos for pg 0
  6175                              <1> 	; 04/08/2016
  6176                              <1> 	;mov	bh, [ACTIVE_PAGE] ; = 0
  6177                              <1> 	;call	_set_cpos
  6178 000030BF C3                  <1> 	retn
  6179                              <1> 
  6180                              <1> vga_wtty_planar:
  6181                              <1> 	; write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight);
  6182                              <1> 	; AL = car, BL = attr (color), DL = xcurs, DH = ycurs, 
  6183                              <1> 	; [CRT_COLS]= nbcols, [CHAR_HEIGHT] = cheight
  6184 000030C0 E87BFDFFFF          <1> 	call	write_gfx_char_pl4
  6185                              <1> vga_wtty_9:
  6186 000030C5 FEC2                <1> 	inc	dl ; xcurs++;
  6187                              <1> vga_wtty_10:
  6188                              <1> 	; Do we need to wrap ?
  6189                              <1> 	; if(xcurs==nbcols)
  6190 000030C7 3A15[BC6F0000]      <1> 	cmp	dl, [CRT_COLS] ; [VGA_COLS]
  6191 000030CD 7204                <1> 	jb	short vga_wtty_11 ; no
  6192 000030CF 28D2                <1> 	sub	dl, dl ; xcurs=0;
  6193 000030D1 FEC6                <1> 	inc	dh ;  ycurs++;
  6194                              <1> vga_wtty_11:
  6195                              <1> 	; Do we need to scroll ?
  6196                              <1> 	; if(ycurs==nbrows)
  6197 000030D3 3A35[C26F0000]      <1> 	cmp	dh, [VGA_ROWS]
  6198 000030D9 72DD                <1> 	jb	short vga_wtty_12 ; no
  6199                              <1> 	;
  6200                              <1> 	; biosfn_scroll (nblines,attr,rul,cul,rlr,clr,page,dir)
  6201                              <1> 	; al = nblines = 1, bl = attr (color) = 0
  6202                              <1> 	; ch = rul, cl = cul, dh = rlr, dl = clr, page = 0
  6203                              <1> 	; dir = SCROLL_UP
  6204                              <1> 	
  6205 000030DB B001                <1> 	mov	al, 1
  6206 000030DD 28DB                <1> 	sub	bl, bl ; 0 ; blank/black line (attr=0) will be used
  6207 000030DF 6629C9              <1> 	sub	cx, cx ; 0,0
  6208                              <1> 
  6209                              <1> 	; 06/08/2016
  6210 000030E2 8A35[C26F0000]      <1> 	mov	dh, [VGA_ROWS]
  6211 000030E8 FECE                <1> 	dec	dh ; nbrows -1
  6212                              <1> 
  6213 000030EA 6652                <1> 	push	dx 	; 04/08/2016
  6214 000030EC 8A15[BC6F0000]      <1> 	mov	dl, [CRT_COLS]
  6215 000030F2 FECA                <1> 	dec	dl ; nbcols -1
  6216                              <1> 	
  6217 000030F4 8A25[BA6F0000]      <1> 	mov	ah, [CRT_MODE]
  6218                              <1> 	
  6219                              <1> 	; biosfn_scroll(0x01,0x00,0,0,nbrows-1,nbcols-1,page,SCROLL_UP);
  6220 000030FA E8FBF4FFFF          <1> 	call	vga_graphics_up
  6221                              <1> 	; 04/08/2016
  6222 000030FF 665A                <1> 	pop	dx
  6223                              <1> 	;dec	dh ; ycurs-=1
  6224 00003101 EBB5                <1> 	jmp	short vga_wtty_12 
  6225                              <1> 
  6226                              <1> font_setup:
  6227                              <1> 	; 09/01/2021 (TRDOS 386 v2.0.3)
  6228                              <1> 	; 09/07/2016
  6229                              <1> 	; character generator (font loading) functions
  6230                              <1> 	;
  6231                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  6232                              <1> 	; vgabios-0.7a (2011)
  6233                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  6234                              <1> 	; 'vgabios.c', 'int10_func'
  6235                              <1> 
  6236                              <1> 	; AX = 1100H ; Load User-Defined Font (EGA/VGA)
  6237                              <1> 	;
  6238                              <1>         ; BH    height of each character (bytes per character definition)
  6239                              <1>         ; (BL   font block to load (EGA: 0-3; VGA: 0-7))
  6240                              <1> 	; CX    number of characters to redefine (<=256)
  6241                              <1>         ; DX    ASCII code of the first character defined at ES:BP
  6242                              <1>         ; EBP	address of font-definition information
  6243                              <1> 	;	(in user's memory space)
  6244                              <1> 
  6245                              <1> 	; case 0x11:
  6246                              <1>      	; switch(GET_AL())
  6247                              <1>       	; {
  6248                              <1> 	; case 0x00:
  6249                              <1>         ; case 0x10:
  6250                              <1>         ; biosfn_load_text_user_pat(GET_AL(),ES,BP,CX,DX,GET_BL(),GET_BH());
  6251                              <1>         ; break;
  6252                              <1> 
  6253                              <1> 	; AX = 1110H ; Load and Activate User-Defined Font (EGA/VGA)
  6254 00003103 08C0                <1> 	or	al, al ; 0
  6255 00003105 7404                <1> 	jz	short font_setup_0
  6256 00003107 3C10                <1> 	cmp	al, 10h
  6257 00003109 7511                <1> 	jne	short font_setup_1	
  6258                              <1> font_setup_0:
  6259 0000310B E8CE000000          <1> 	call	transfer_user_fonts
  6260 00003110 721C                <1> 	jc	short font_setup_error
  6261 00003112 E8B2010000          <1> 	call	load_text_user_pat
  6262 00003117 E93BEAFFFF          <1>         jmp     VIDEO_RETURN 
  6263                              <1> font_setup_1:
  6264                              <1> 	; AX = 1101H ; Load ROM 8x14 Character Set (EGA/VGA)
  6265                              <1> 	; case 0x01:
  6266                              <1>         ; case 0x11:
  6267                              <1>         ; biosfn_load_text_8_14_pat(GET_AL(),GET_BL());
  6268                              <1>         ; break;
  6269 0000311C 3C01                <1> 	cmp	al, 1
  6270 0000311E 7404                <1> 	je	short font_setup_2
  6271 00003120 3C11                <1> 	cmp	al, 11h
  6272 00003122 7511                <1> 	jne	short font_setup_3	
  6273                              <1> font_setup_2:
  6274                              <1> 	; AX = 1111H ; Load and Activate ROM 8x14 Character Set (EGA/VGA)
  6275                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
  6276 00003124 E8DC020000          <1> 	call	load_text_8_14_pat
  6277 00003129 E929EAFFFF          <1>         jmp     VIDEO_RETURN
  6278                              <1> font_setup_error:
  6279 0000312E 29C0                <1> 	sub	eax, eax ; 0 -> fonts could not be loaded
  6280 00003130 E927EAFFFF          <1> 	jmp	_video_return
  6281                              <1> font_setup_3:
  6282                              <1> 	; AX = 1102H ; Load ROM 8x8 Character Set (EGA/VGA)
  6283                              <1> 	; case 0x02:
  6284                              <1>         ; case 0x12:
  6285                              <1>         ; biosfn_load_text_8_8_pat(GET_AL(),GET_BL());
  6286                              <1>         ; break;
  6287 00003135 3C02                <1> 	cmp	al, 2
  6288 00003137 7404                <1> 	je	short font_setup_4
  6289 00003139 3C12                <1> 	cmp	al, 12h
  6290 0000313B 750A                <1> 	jne	short font_setup_5	
  6291                              <1> font_setup_4:
  6292                              <1> 	; AX = 1112H ; Load and Activate ROM 8x8 Character Set (EGA/VGA)
  6293                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
  6294 0000313D E8F3020000          <1> 	call	load_text_8_8_pat
  6295 00003142 E910EAFFFF          <1>         jmp     VIDEO_RETURN
  6296                              <1> font_setup_5:
  6297                              <1> 	; AX = 1104H ; Load ROM 8x16 Character Set (EGA/VGA)
  6298                              <1> 	; case 0x04:
  6299                              <1>         ; case 0x14:
  6300                              <1>         ; biosfn_load_text_8_16_pat(GET_AL(),GET_BL());
  6301                              <1>         ; break;
  6302 00003147 3C04                <1> 	cmp	al, 4
  6303 00003149 7404                <1> 	je	short font_setup_6
  6304 0000314B 3C14                <1> 	cmp	al, 14h
  6305 0000314D 750A                <1> 	jne	short font_setup_7	
  6306                              <1> font_setup_6:
  6307                              <1> 	; AX = 1114H ; Load and Activate ROM 8x16 Character Set (EGA/VGA)
  6308                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
  6309 0000314F E82A030000          <1> 	call	load_text_8_16_pat
  6310 00003154 E9FEE9FFFF          <1>         jmp     VIDEO_RETURN
  6311                              <1> font_setup_7:
  6312                              <1> 	; Note: AX=1120h (Setup INT 1Fh, EXT_PTR) is not needed
  6313                              <1> 	; for TRDOS 386 (TRDOS v2.0) video functionality;
  6314                              <1> 	; because, originally EXT_PTR (font address) was used for
  6315                              <1> 	; chars 80h to 0FFh (after the first 128 ASCII char fonts), for
  6316                              <1> 	; CGA graphics mode; currenty, 'vgafont8' address has 256 chars!
  6317                              <1> 	; 
  6318                              <1> 	; case 0x20:
  6319                              <1>         ; biosfn_load_gfx_8_8_chars(ES,BP);
  6320                              <1>         ; break; 
  6321                              <1> 	; case 0x21:
  6322                              <1>         ; biosfn_load_gfx_user_chars(ES,BP,CX,GET_BL(),GET_DL());
  6323                              <1>         ; break;
  6324                              <1> 	; AX = 1121H ; Setup User-Defined Font for Graphics Mode (VGA)
  6325                              <1> 	; BL   screen rows code: 00H = user-specified (in DL)
  6326                              <1>         ;                        01H = 14 rows
  6327                              <1>         ;                        02H = 25 rows
  6328                              <1>         ;                        03H = 43 rows
  6329                              <1>         ; CX   bytes per character definition
  6330                              <1>         ; DL   (when BL=0) custom number of character rows on screen
  6331                              <1>         ; EBP  address of font-definition information (user's mem space)
  6332                              <1> 
  6333 00003159 3C21                <1> 	cmp	al, 21h
  6334 0000315B 7531                <1> 	jne	short font_setup_9
  6335                              <1> 
  6336                              <1> 	; TRDOS 386 modification !
  6337                              <1> 	; dh = 0 -> 256 characters
  6338                              <1> 	; dh = 80h -> second 128 characters
  6339                              <1> 	; dh = 0FFh -> first 128 characters
  6340                              <1> 
  6341                              <1> 	; 09/01/2021 (TRDOS 386 v2.0.3)
  6342                              <1> 	;push	ebx
  6343 0000315D 51                  <1> 	push	ecx
  6344 0000315E 52                  <1> 	push	edx
  6345 0000315F 30D2                <1> 	xor	dl, dl
  6346 00003161 88CF                <1> 	mov	bh, cl ; character height
  6347 00003163 66B90001            <1> 	mov	cx, 100h ; 256
  6348 00003167 08F6                <1> 	or	dh, dh ; 0
  6349 00003169 7410                <1> 	jz	short  font_setup_8
  6350 0000316B FECD                <1> 	dec	ch ; cx = 0
  6351 0000316D 80FEFF              <1> 	cmp	dh, 0FFh
  6352 00003170 7409                <1> 	je	short font_setup_8 ; 1st 128 chars
  6353                              <1> 	; 2nd 128 chars
  6354 00003172 80FE80              <1> 	cmp	dh, 80h
  6355 00003175 75B7                <1> 	jne	short font_setup_error ; invalid !
  6356 00003177 88F1                <1> 	mov	cl, dh
  6357 00003179 86D6                <1> 	xchg	dl, dh
  6358                              <1> 	; number of chars, cx = 80h 
  6359                              <1> 	; start char, dl = 80h
  6360                              <1> font_setup_8:	
  6361 0000317B E85E000000          <1> 	call	transfer_user_fonts
  6362 00003180 5A                  <1> 	pop	edx
  6363 00003181 59                  <1> 	pop	ecx
  6364                              <1> 	;pop	ebx
  6365 00003182 72AA                <1> 	jc	short font_setup_error
  6366                              <1> 	; ebp = user's font data address in system's memory space
  6367 00003184 E83F030000          <1> 	call	load_gfx_user_chars
  6368 00003189 E9C9E9FFFF          <1>         jmp     VIDEO_RETURN 
  6369                              <1> font_setup_9:
  6370                              <1> 	; case 0x22:
  6371                              <1>         ; biosfn_load_gfx_8_14_chars(GET_BL());
  6372                              <1>         ; break;
  6373 0000318E 3C22                <1> 	cmp	al, 22h
  6374 00003190 750A                <1> 	jne	short font_setup_10
  6375 00003192 E86D030000          <1> 	call	load_gfx_8_14_chars	
  6376 00003197 E9BBE9FFFF          <1>         jmp     VIDEO_RETURN 
  6377                              <1> font_setup_10:	
  6378                              <1> 	; case 0x23:
  6379                              <1>         ; biosfn_load_gfx_8_8_dd_chars(GET_BL());
  6380                              <1>         ; break;
  6381 0000319C 3C23                <1> 	cmp	al, 23h
  6382 0000319E 750A                <1> 	jne	short font_setup_11
  6383 000031A0 E8A0030000          <1> 	call	load_gfx_8_8_chars	
  6384 000031A5 E9ADE9FFFF          <1>         jmp     VIDEO_RETURN 
  6385                              <1> font_setup_11:	
  6386                              <1> 	; case 0x24:
  6387                              <1>         ; biosfn_load_gfx_8_16_chars(GET_BL());
  6388                              <1>         ; break;
  6389 000031AA 3C24                <1> 	cmp	al, 24h
  6390 000031AC 750A                <1> 	jne	short font_setup_12
  6391 000031AE E8D3030000          <1> 	call	load_gfx_8_16_chars	
  6392 000031B3 E99FE9FFFF          <1>         jmp     VIDEO_RETURN 
  6393                              <1> font_setup_12:
  6394                              <1>  	; case 0x30:
  6395                              <1>         ; biosfn_get_font_info(GET_BH(),&ES,&BP,&CX,&DX);
  6396                              <1>         ; break;
  6397 000031B8 3C30                <1> 	cmp	al, 30h
  6398 000031BA 750A                <1> 	jne	short font_setup_13			
  6399 000031BC E806040000          <1> 	call	get_font_info
  6400                              <1> 	; eax = return value (info: 4 bytes for 4 parms)
  6401                              <1> 	; eax = 0 -> invalid function (input)
  6402 000031C1 E996E9FFFF          <1>         jmp     _video_return
  6403                              <1> font_setup_13:
  6404 000031C6 3C03                <1> 	cmp	al, 03h ; AX = 1103h	
  6405 000031C8 750D                <1> 	jne	short font_setup_14
  6406                              <1> 	; biosfn_set_text_block_specifier:
  6407                              <1> 	; BL = font block selector code	
  6408                              <1> 	; NOTE: TRDOS 386 only uses and sets font block 0
  6409                              <1> 	; (It is as BL = 0 for TRDOS 386)
  6410 000031CA 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  6411                              <1> 	;mov	ah, bl
  6412 000031CE 28E4                <1> 	sub	ah, ah ; 0
  6413                              <1> 	;mov	al, 03h
  6414 000031D0 66EF                <1> 	out	dx, ax
  6415 000031D2 E980E9FFFF          <1> 	jmp     VIDEO_RETURN 
  6416                              <1> 	
  6417                              <1> font_setup_14:
  6418 000031D7 29C0                <1> 	sub	eax, eax ; 0 = invalid function
  6419 000031D9 E97EE9FFFF          <1>         jmp     _video_return
  6420                              <1> 
  6421                              <1> transfer_user_fonts:
  6422                              <1> 	; 19/01/2021
  6423                              <1> 	; 09/01/2021
  6424                              <1> 	; 05/01/2021 (TRDOS 386 v2.0.3)
  6425                              <1> 
  6426                              <1> 	; BH    height of each character (bytes per character)
  6427                              <1> 	; CX    number of characters to redefine (<=256)
  6428                              <1>         ; DX    ASCII code of the first character defined at EBP
  6429                              <1>         ; EBP	address of font-definition information
  6430                              <1> 	;	(in user's memory space)
  6431                              <1> 
  6432                              <1> 	; Modified registers: eax, edx, ecx, esi, edi, ebp
  6433                              <1> 	;
  6434                              <1> 	; output:
  6435                              <1> 	;	ebp = user font data address in system memory
  6436                              <1> 
  6437 000031DE 81E2FFFF0000        <1> 	and	edx, 0FFFFh
  6438 000031E4 81E1FFFF0000        <1> 	and	ecx, 0FFFFh
  6439 000031EA 7537                <1> 	jnz	short transfer_user_fonts_5
  6440                              <1> 
  6441 000031EC 09D2                <1> 	or	edx, edx
  6442 000031EE 7531                <1> 	jnz	short transfer_user_fonts_4
  6443 000031F0 09ED                <1> 	or	ebp, ebp
  6444 000031F2 752D                <1> 	jnz	short transfer_user_fonts_4
  6445                              <1> 
  6446                              <1> 	; cx = 0, dx = 0, ebp = 0
  6447                              <1> 	; copy system font to user font
  6448                              <1> 
  6449 000031F4 B140                <1> 	mov	cl, 64 ; 64 dwords
  6450                              <1> 	
  6451 000031F6 80FF10              <1> 	cmp	bh, 16
  6452 000031F9 7417                <1> 	je	short transfer_user_fonts_2
  6453 000031FB 80FF08              <1> 	cmp	bh, 8
  6454 000031FE 7406                <1> 	je	short transfer_user_fonts_1
  6455                              <1> 
  6456 00003200 BD[24600100]        <1> 	mov	ebp, vgafont14
  6457 00003205 C3                  <1> 	retn 
  6458                              <1> 
  6459                              <1> transfer_user_fonts_1:
  6460 00003206 BF00500900          <1> 	mov	edi, VGAFONT8USER
  6461 0000320B BE[24580100]        <1> 	mov	esi, vgafont8
  6462 00003210 EB0A                <1> 	jmp	short transfer_user_fonts_3
  6463                              <1> 
  6464                              <1> transfer_user_fonts_2:
  6465 00003212 BF00400900          <1> 	mov	edi, VGAFONT16USER
  6466 00003217 BE[246E0100]        <1> 	mov	esi, vgafont16
  6467                              <1> transfer_user_fonts_3:
  6468 0000321C 89FD                <1> 	mov	ebp, edi
  6469 0000321E F3A5                <1> 	rep	movsd
  6470 00003220 C3                  <1> 	retn
  6471                              <1> 
  6472                              <1> transfer_user_fonts_4:
  6473 00003221 F9                  <1> 	stc	
  6474 00003222 C3                  <1> 	retn
  6475                              <1> 	
  6476                              <1> transfer_user_fonts_5:
  6477 00003223 09ED                <1> 	or	ebp, ebp
  6478 00003225 74FA                <1> 	jz	short transfer_user_fonts_4 ; invalid address !
  6479                              <1> 
  6480 00003227 6681F90001          <1> 	cmp	cx, 256
  6481 0000322C 77F3                <1> 	ja	short transfer_user_fonts_4
  6482 0000322E 29D1                <1> 	sub	ecx, edx
  6483 00003230 76EF                <1> 	jna	short transfer_user_fonts_4
  6484                              <1> 
  6485 00003232 80FF0E              <1> 	cmp	bh, 14 ; 8x14 font
  6486                              <1> 		       ; (there is not an alternative buffer)
  6487 00003235 7525                <1> 	jne	short transfer_user_fonts_6
  6488                              <1> 	
  6489                              <1> 	; use system's 8x14 font space if permission flag is 1
  6490 00003237 F605[82120300]80    <1> 	test	byte [ufont], 80h
  6491 0000323E 74E1                <1> 	jz	short transfer_user_fonts_4 ; not allowed	
  6492                              <1> 
  6493                              <1> 	; permission is given (for vgafont14 location etc.)
  6494                              <1> 	; (for permanent font modification)
  6495                              <1> 	;
  6496                              <1> 	; 19/01/2021
  6497                              <1> 	; Note: Permission flag can be set by 'root' while
  6498                              <1> 	;	system is not in multi tasking/user mode
  6499                              <1> 	;	while [multi_tasking] = 0 and [u.uid] = 0
  6500                              <1> 
  6501 00003240 52                  <1> 	push	edx	
  6502 00003241 30E4                <1> 	xor	ah, ah
  6503 00003243 88F8                <1> 	mov	al, bh ; mov al, 14 
  6504 00003245 66F7E1              <1> 	mul	cx 
  6505                              <1> 		; ecx = byte count 
  6506 00003248 89C1                <1> 	mov	ecx, eax
  6507 0000324A 5A                  <1> 	pop	edx	
  6508 0000324B 30E4                <1> 	xor	ah, ah
  6509 0000324D 88F8                <1> 	mov	al, bh ; mov ax, 14 ; bytes per character
  6510 0000324F 66F7E2              <1> 	mul	dx
  6511 00003252 6689C2              <1> 	mov	dx, ax ; char offset
  6512 00003255 BF[24600100]        <1> 	mov	edi, vgafont14
  6513 0000325A EB4C                <1> 	jmp	short transfer_user_fonts_8			
  6514                              <1> transfer_user_fonts_6:
  6515 0000325C 80FF08              <1> 	cmp	bh, 8 ; 8x8 font
  6516 0000325F 7522                <1> 	jne	short transfer_user_fonts_7 ; 8x16 font
  6517 00003261 66C1E203            <1> 	shl	dx, 3 ; * 8
  6518 00003265 66C1E103            <1> 	shl	cx, 3 ; * 8
  6519                              <1> 	; 09/01/2021
  6520 00003269 BF00500900          <1> 	mov	edi, VGAFONT8USER
  6521 0000326E F605[82120300]08    <1> 	test	byte [ufont], 8  ; already loaded ?	
  6522 00003275 7531                <1> 	jnz	short transfer_user_fonts_8 ; yes
  6523 00003277 BE[24580100]        <1> 	mov	esi, vgafont8
  6524 0000327C E83B000000          <1> 	call	transfer_user_fonts_10
  6525 00003281 EB25                <1> 	jmp	short transfer_user_fonts_8
  6526                              <1> transfer_user_fonts_7:
  6527 00003283 80FF10              <1> 	cmp	bh, 16 ; 8x16 font
  6528 00003286 7599                <1> 	jne	short transfer_user_fonts_4  ; invalid !
  6529 00003288 66C1E204            <1> 	shl	dx, 4 ; * 16
  6530 0000328C 66C1E104            <1> 	shl	cx, 4 ; * 16 
  6531 00003290 BF00400900          <1> 	mov	edi, VGAFONT16USER
  6532 00003295 F605[82120300]10    <1> 	test	byte [ufont], 16  ; already loaded ?	
  6533 0000329C 750A                <1> 	jnz	short transfer_user_fonts_8 ; yes
  6534 0000329E BE[246E0100]        <1> 	mov	esi, vgafont16
  6535 000032A3 E814000000          <1> 	call	transfer_user_fonts_10
  6536                              <1> transfer_user_fonts_8:
  6537 000032A8 01D7                <1> 	add	edi, edx ; char offset
  6538                              <1> 	; 09/07/2016
  6539                              <1> 	;and	ecx, 0FFFFh
  6540                              <1> 	; ECX = byte count
  6541                              <1> 	;push	ecx
  6542 000032AA 89EE                <1> 	mov	esi, ebp ; user's font buffer
  6543                              <1> 	; 09/01/2021
  6544 000032AC 89FD                <1> 	mov	ebp, edi ; system addr for user's font
  6545                              <1> 	; 05/01/2021
  6546                              <1> 	;mov	edi, Cluster_Buffer  ; system buffer
  6547 000032AE E85BE00000          <1> 	call	transfer_from_user_buffer
  6548                              <1> 	;pop	ecx
  6549                              <1> 	; ecx = transfer (byte) count = character count
  6550 000032B3 7206                <1> 	jc	short transfer_user_fonts_9
  6551                              <1> 	; 05/01/2021
  6552                              <1> 	;mov	ebp, Cluster_Buffer
  6553                              <1> 	
  6554 000032B5 083D[82120300]      <1> 	or	byte [ufont], bh 
  6555                              <1> 			; 8x8 or 8x16 user font ready 
  6556                              <1> transfer_user_fonts_9:
  6557 000032BB C3                  <1> 	retn
  6558                              <1> 
  6559                              <1> transfer_user_fonts_10:
  6560                              <1> 	; 09/01/2021
  6561 000032BC 56                  <1> 	push	esi
  6562 000032BD 57                  <1> 	push	edi
  6563 000032BE 51                  <1> 	push	ecx
  6564 000032BF 66B94000            <1> 	mov	cx, 64
  6565 000032C3 F3A5                <1> 	rep	movsd
  6566 000032C5 59                  <1> 	pop	ecx
  6567 000032C6 5F                  <1> 	pop	edi
  6568 000032C7 5E                  <1> 	pop	esi
  6569 000032C8 C3                  <1> 	retn
  6570                              <1> 
  6571                              <1> load_text_user_pat:
  6572                              <1> 	; 26/07/2016
  6573                              <1> 	; 09/07/2016
  6574                              <1> 	; load user defined (EGA/VGA) text fonts
  6575                              <1> 	;
  6576                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  6577                              <1> 	; vgabios-0.7a (2011)
  6578                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  6579                              <1> 	; 'vgabios.c', 'biosfn_load_text_user_pat'
  6580                              <1> 
  6581                              <1> 	; biosfn_load_text_user_pat (AL,ES,BP,CX,DX,BL,BH)
  6582                              <1> 
  6583                              <1> 	; get_font_access();
  6584                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  6585                              <1> 	; for(i=0;i<CX;i++)
  6586                              <1> 	; {
  6587                              <1> 	;  src = BP + i * BH;
  6588                              <1> 	;  dest = blockaddr + (DX + i) * 32;
  6589                              <1> 	;  memcpyb(0xA000, dest, ES, src, BH);
  6590                              <1> 	; }
  6591                              <1> 	; release_font_access();
  6592                              <1> 	; if(AL>=0x10)
  6593                              <1> 	; {
  6594                              <1> 	; set_scan_lines(BH);
  6595                              <1> 	; }
  6596                              <1> 
  6597 000032C9 50                  <1> 	push	eax
  6598 000032CA E83C000000          <1> 	call	get_font_access
  6599 000032CF 28DB                <1> 	sub	bl, bl ; i = 0	
  6600                              <1> ltup_1:
  6601 000032D1 88D8                <1> 	mov	al, bl
  6602 000032D3 F6E7                <1> 	mul	bh
  6603 000032D5 0FB7F0              <1> 	movzx	esi, ax
  6604 000032D8 01EE                <1> 	add	esi, ebp
  6605 000032DA 88D8                <1> 	mov	al, bl
  6606 000032DC 28E4                <1> 	sub	ah, ah
  6607 000032DE 6601D0              <1> 	add	ax, dx ; (DX + i)
  6608 000032E1 66C1E005            <1> 	shl	ax, 5  ; * 32
  6609 000032E5 0FB7F8              <1> 	movzx	edi, ax
  6610 000032E8 81C700000A00        <1> 	add	edi, 0A0000h
  6611 000032EE 51                  <1> 	push	ecx
  6612 000032EF 0FB6CF              <1> 	movzx	ecx, bh 		
  6613 000032F2 F3A4                <1> 	rep	movsb
  6614 000032F4 59                  <1> 	pop	ecx	
  6615 000032F5 FEC3                <1> 	inc	bl
  6616 000032F7 38CB                <1> 	cmp	bl, cl
  6617 000032F9 75D6                <1> 	jne	short ltup_1	
  6618                              <1> 	;
  6619 000032FB E840000000          <1> 	call	release_font_access
  6620                              <1> 	;
  6621 00003300 58                  <1> 	pop	eax
  6622                              <1> 	; if(AL>=0x10)
  6623 00003301 3C10                <1> 	cmp	al, 10h
  6624 00003303 7205                <1> 	jb	short ltup_2
  6625                              <1>    	; set_scan_lines(BH);
  6626 00003305 E875000000          <1> 	call	set_scan_lines
  6627                              <1> ltup_2:
  6628 0000330A C3                  <1> 	retn
  6629                              <1> 
  6630                              <1> get_font_access:
  6631                              <1> 	; 09/07/2016
  6632                              <1> 	;
  6633                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  6634                              <1> 	; vgabios-0.7a (2011)
  6635                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  6636                              <1> 	; 'vgabios.c', 'get_font_access'
  6637                              <1> 
  6638                              <1> 	; get_font_access()
  6639 0000330B 52                  <1> 	push	edx
  6640 0000330C 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  6641 00003310 66B80001            <1> 	mov	ax, 0100h
  6642 00003314 66EF                <1> 	out	dx, ax
  6643 00003316 66B80204            <1> 	mov	ax, 0402h
  6644 0000331A 66EF                <1> 	out	dx, ax
  6645 0000331C 66B80407            <1> 	mov	ax, 0704h
  6646 00003320 66EF                <1> 	out	dx, ax
  6647 00003322 66B80003            <1> 	mov	ax, 0300h
  6648 00003326 66EF                <1> 	out	dx, ax
  6649 00003328 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  6650 0000332C 66B80402            <1> 	mov	ax, 0204h
  6651 00003330 66EF                <1> 	out	dx, ax
  6652 00003332 66B80500            <1> 	mov	ax, 0005h
  6653 00003336 66EF                <1> 	out	dx, ax
  6654 00003338 66B80604            <1> 	mov	ax, 0406h
  6655 0000333C 66EF                <1> 	out	dx, ax
  6656 0000333E 5A                  <1> 	pop	edx
  6657 0000333F C3                  <1> 	retn
  6658                              <1> 
  6659                              <1> release_font_access:
  6660                              <1> 	; 29/07/2016
  6661                              <1> 	; 09/07/2016
  6662                              <1> 	;
  6663                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  6664                              <1> 	; vgabios-0.7a (2011)
  6665                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  6666                              <1> 	; 'vgabios.c', 'release_font_access'
  6667                              <1> 
  6668 00003340 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  6669 00003344 66B80001            <1> 	mov	ax, 0100h
  6670 00003348 66EF                <1> 	out	dx, ax
  6671 0000334A 66B80203            <1> 	mov	ax, 0302h
  6672 0000334E 66EF                <1> 	out	dx, ax
  6673 00003350 66B80403            <1> 	mov	ax, 0304h
  6674 00003354 66EF                <1> 	out	dx, ax
  6675 00003356 66B80003            <1> 	mov	ax, 0300h
  6676 0000335A 66EF                <1> 	out	dx, ax
  6677 0000335C 66BACC03            <1> 	mov	dx, 3CCh ; VGAREG_READ_MISC_OUTPUT
  6678 00003360 EC                  <1>  	in	al, dx
  6679 00003361 2401                <1> 	and	al, 01h
  6680 00003363 C0E002              <1> 	shl	al, 2
  6681 00003366 0C0A                <1> 	or	al, 0Ah
  6682 00003368 88C4                <1> 	mov	ah, al
  6683 0000336A B006                <1> 	mov	al, 06h
  6684 0000336C 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  6685 00003370 66EF                <1> 	out	dx, ax
  6686 00003372 66B80400            <1> 	mov	ax, 0004h
  6687 00003376 66EF                <1> 	out	dx, ax
  6688 00003378 66B80510            <1> 	mov	ax, 1005h
  6689 0000337C 66EF                <1> 	out	dx, ax
  6690 0000337E C3                  <1> 	retn
  6691                              <1> 
  6692                              <1> set_scan_lines:
  6693                              <1> 	; 09/07/2016
  6694                              <1> 	;
  6695                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  6696                              <1> 	; vgabios-0.7a (2011)
  6697                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  6698                              <1> 	; 'vgabios.c', 'set_scan_lines'
  6699                              <1> 
  6700                              <1> 	; set_scan_lines(lines)
  6701                              <1> 	; BH = lines
  6702                              <1> 
  6703                              <1> 	; outb(crtc_addr, 0x09);
  6704 0000337F 66BAD403            <1> 	mov	dx, 3D4h ; CRTC_ADDRESS = 3D4h (always)
  6705 00003383 B009                <1> 	mov	al, 09h
  6706 00003385 EE                  <1> 	out	dx, al
  6707                              <1> 	; crtc_r9 = inb(crtc_addr+1);
  6708 00003386 6642                <1> 	inc	dx ; 3D5h
  6709 00003388 EC                  <1> 	in	al, dx
  6710                              <1> 	; crtc_r9 = (crtc_r9 & 0xe0) | (lines - 1);
  6711 00003389 24E0                <1> 	and	al, 0E0h
  6712 0000338B FECF                <1> 	dec	bh ; lines - 1
  6713 0000338D 08F8                <1> 	or	al, bh
  6714                              <1> 	; outb(crtc_addr+1, crtc_r9);
  6715 0000338F EE                  <1> 	out	dx, al
  6716                              <1> 	;inc	bh 
  6717                              <1> 	; if(lines==8)
  6718                              <1> 	;cmp	bh, 8
  6719 00003390 80FF07              <1> 	cmp	bh, 7
  6720 00003393 7506                <1> 	jne	short ssl_1
  6721                              <1> 	; biosfn_set_cursor_shape(0x06,0x07);
  6722 00003395 66B90706            <1> 	mov	cx, 0607h
  6723 00003399 EB06                <1> 	jmp	short ssl_2
  6724                              <1> ssl_1:
  6725                              <1> 	; biosfn_set_cursor_shape(lines-4,lines-3);
  6726 0000339B 88F9                <1> 	mov	cl, bh ; lines - 1
  6727 0000339D 88CD                <1> 	mov	ch, cl ; lines - 1 (16 -> 15)
  6728 0000339F FECD                <1> 	dec	ch  ; lines - 2 (16 -> 14)
  6729                              <1> ssl_2:
  6730                              <1> 	; CH = start line, CL = stop line
  6731 000033A1 B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
  6732 000033A3 66890D[D36F0000]    <1> 	mov	[CURSOR_MODE], cx ; save in data area
  6733 000033AA E813F0FFFF          <1> 	call	m16	; output cx register
  6734                              <1> 	; write_word(BIOSMEM_SEG,BIOSMEM_CHAR_HEIGHT, lines);
  6735 000033AF FEC7                <1> 	inc	bh ; lines
  6736 000033B1 883D[BE6F0000]      <1> 	mov	[CHAR_HEIGHT], bh
  6737                              <1> 	;  outb(crtc_addr, 0x12);
  6738 000033B7 66BAD403            <1> 	mov	dx, 3D4h ; CRTC_ADDRESS
  6739 000033BB B012                <1> 	mov	al, 12h
  6740 000033BD EE                  <1> 	out	dx, al
  6741                              <1> 	; vde = inb(crtc_addr+1);
  6742 000033BE 6642                <1> 	inc	dx
  6743 000033C0 EC                  <1> 	in	al, dx
  6744 000033C1 88C4                <1> 	mov	ah, al
  6745                              <1> 	; outb(crtc_addr, 0x07);
  6746 000033C3 664A                <1> 	dec	dx
  6747 000033C5 B007                <1> 	mov	al, 07h
  6748 000033C7 EE                  <1> 	out	dx, al
  6749                              <1> 	; ovl = inb(crtc_addr+1);
  6750 000033C8 6642                <1> 	inc	dx
  6751 000033CA EC                  <1> 	in	al, dx
  6752                              <1> 	; vde += (((ovl & 0x02) << 7) + ((ovl & 0x40) << 3) + 1);
  6753 000033CB 88E2                <1> 	mov	dl, ah ; vde
  6754 000033CD 88C6                <1> 	mov	dh, al ; ovl
  6755 000033CF 6683E002            <1> 	and	ax, 02h
  6756 000033D3 66C1E007            <1> 	shl	ax, 7
  6757 000033D7 6689C1              <1> 	mov	cx, ax ; (ovl & 0x02) << 7)	
  6758 000033DA 88F0                <1> 	mov	al, dh ; ovl
  6759 000033DC 6683E040            <1> 	and	ax, 40h			
  6760 000033E0 66C1E003            <1> 	shl	ax, 3  ; (ovl & 0x40) << 3)
  6761 000033E4 6640                <1> 	inc	ax ; + 1 
  6762 000033E6 6601C8              <1> 	add	ax, cx
  6763 000033E9 30F6                <1> 	xor	dh, dh
  6764 000033EB 6601D0              <1> 	add	ax, dx ; + vde
  6765                              <1> 	; rows = vde / lines;
  6766 000033EE F6F7                <1> 	div	bh
  6767                              <1> 	;dec	al ; rows -1
  6768                              <1> 	; write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, rows-1);
  6769 000033F0 A2[C26F0000]        <1> 	mov	[VGA_ROWS], al ; rows (not 'rows-1' !)
  6770                              <1> 	; write_word(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE, rows * cols * 2);
  6771                              <1> 	;mov	ah, [CRT_COLS]
  6772                              <1> 	;mul	ah
  6773                              <1> 	; 17/11/2020
  6774 000033F5 F625[BC6F0000]      <1> 	mul	byte [CRT_COLS]
  6775 000033FB 66D1E0              <1> 	shl	ax, 1
  6776 000033FE 66A3[288E0100]      <1> 	mov 	[CRT_LEN], ax	
  6777 00003404 C3                  <1> 	retn
  6778                              <1> 
  6779                              <1> load_text_8_14_pat:
  6780                              <1> 	; 26/07/2016
  6781                              <1> 	; 25/07/2016
  6782                              <1> 	; 23/07/2016
  6783                              <1> 	; 09/07/2016
  6784                              <1> 	; load user defined (EGA/VGA) text fonts
  6785                              <1> 	;
  6786                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  6787                              <1> 	; vgabios-0.7a (2011)
  6788                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  6789                              <1> 	; 'vgabios.c', 'biosfn_load_text_8_14_pat'
  6790                              <1> 
  6791                              <1> 	; biosfn_load_text_8_14_pat (AL,BL)
  6792                              <1> 
  6793                              <1> 	; get_font_access();
  6794                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  6795                              <1> 	; for(i=0;i<0x100;i++)
  6796                              <1> 	; {
  6797                              <1> 	;  src = i * 14;
  6798                              <1> 	;  dest = blockaddr + i * 32;
  6799                              <1> 	;  memcpyb(0xA000, dest, 0xC000, vgafont14+src, 14);
  6800                              <1> 	; }
  6801                              <1> 	; release_font_access();
  6802                              <1> 	; if(AL>=0x10)
  6803                              <1> 	; {
  6804                              <1> 	; set_scan_lines(14);
  6805                              <1> 	; }
  6806                              <1> 
  6807 00003405 50                  <1> 	push	eax
  6808 00003406 E800FFFFFF          <1> 	call	get_font_access
  6809                              <1> 
  6810                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  6811                              <1> 	;mov	dl, bl
  6812                              <1> 	;and	dl, 3
  6813                              <1> 	;shl	dx, 14
  6814                              <1> 	;xchg	dx, bx
  6815                              <1> 	;and	dl, 4
  6816                              <1> 	;shl	dx, 11
  6817                              <1> 	;add	dx, bx 	
  6818                              <1>  
  6819                              <1> 	;xor	dx, dx  ; blockaddr = 0
  6820                              <1> 	; Always block 0 for TRDOS 386 ! (blockaddr=0)
  6821                              <1> 
  6822 0000340B 28DB                <1> 	sub	bl, bl ; i = 0
  6823 0000340D B70E                <1> 	mov	bh, 14
  6824 0000340F BE[24600100]        <1> 	mov	esi, vgafont14
  6825 00003414 BF00000A00          <1> 	mov	edi, 0A0000h		
  6826                              <1> lt8_14_1:
  6827                              <1> 	;mov	al, bl
  6828                              <1> 	;mul	bh
  6829                              <1> 	;movzx	esi, ax
  6830                              <1> 	;add	esi, vgafont14
  6831                              <1> 	;mov	al, bl
  6832                              <1> 	;sub	ah, ah
  6833                              <1> 	;shl	ax, 5 ; * 32
  6834                              <1> 	;;add	ax, dx ; blockaddr + i * 32;
  6835                              <1> 	;movzx	edi, ax ; dest
  6836                              <1> 	;add	edi, 0A0000h
  6837 00003419 0FB6CF              <1> 	movzx	ecx, bh 		
  6838 0000341C F3A4                <1> 	rep	movsb
  6839 0000341E 83C712              <1> 	add	edi, 18 ; 32 - 14
  6840 00003421 FEC3                <1> 	inc	bl
  6841 00003423 75F4                <1> 	jnz	short lt8_14_1	
  6842                              <1> 	;
  6843 00003425 E816FFFFFF          <1> 	call	release_font_access
  6844                              <1> 	;
  6845 0000342A 58                  <1> 	pop	eax
  6846                              <1> 	; if(AL>=0x10)
  6847 0000342B 3C10                <1> 	cmp	al, 10h
  6848 0000342D 7205                <1> 	jb	short lt8_14_4
  6849                              <1> 	; BH = 14
  6850                              <1>    	; set_scan_lines(14);
  6851 0000342F E84BFFFFFF          <1> 	call	set_scan_lines
  6852                              <1> lt8_14_4:
  6853 00003434 C3                  <1> 	retn
  6854                              <1> 
  6855                              <1> load_text_8_8_pat:
  6856                              <1> 	; 05/01/2021 (TRDOS 386 v2.0.3)
  6857                              <1> 	; 26/07/2016
  6858                              <1> 	; 25/07/2016
  6859                              <1> 	; 23/07/2016
  6860                              <1> 	; 09/07/2016
  6861                              <1> 	; load user defined (EGA/VGA) text fonts
  6862                              <1> 	;
  6863                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  6864                              <1> 	; vgabios-0.7a (2011)
  6865                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  6866                              <1> 	; 'vgabios.c', 'biosfn_load_text_8_8_pat'
  6867                              <1> 
  6868                              <1> 	; biosfn_load_text_8_8_pat (AL,BL)
  6869                              <1> 
  6870                              <1> 	; get_font_access();
  6871                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  6872                              <1> 	; for(i=0;i<0x100;i++)
  6873                              <1> 	; {
  6874                              <1> 	;  src = i * 8;
  6875                              <1> 	;  dest = blockaddr + i * 32;
  6876                              <1> 	;  memcpyb(0xA000, dest, 0xC000, vgafont8+src, 8);
  6877                              <1> 	; }
  6878                              <1> 	; release_font_access();
  6879                              <1> 	; if(AL>=0x10)
  6880                              <1> 	; {
  6881                              <1> 	; set_scan_lines(8);
  6882                              <1> 	; }
  6883                              <1> 
  6884 00003435 50                  <1> 	push	eax
  6885 00003436 E8D0FEFFFF          <1> 	call	get_font_access
  6886                              <1> 
  6887                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  6888                              <1> 	;mov	dl, bl
  6889                              <1> 	;and	dl, 3
  6890                              <1> 	;shl	dx, 14
  6891                              <1> 	;xchg	dx, bx
  6892                              <1> 	;and	dl, 4
  6893                              <1> 	;shl	dx, 11
  6894                              <1> 	;add	dx, bx 	
  6895                              <1>  
  6896                              <1> 	;xor	dx, dx  ; blockaddr = 0
  6897                              <1> 	; Always block 0 for TRDOS 386 ! (blockaddr=0)
  6898                              <1> 
  6899 0000343B 28DB                <1> 	sub	bl, bl ; i = 0
  6900 0000343D B708                <1> 	mov	bh, 8
  6901                              <1> 	;mov	esi, vgafont8
  6902 0000343F BF00000A00          <1> 	mov	edi, 0A0000h
  6903                              <1> 
  6904                              <1> 	; 05/01/2021
  6905 00003444 F605[82120300]80    <1> 	test	byte [ufont], 80h
  6906 0000344B 7410                <1> 	jz	short lt8_8_0
  6907                              <1> 		; user font permission (after set mode)
  6908 0000344D F605[82120300]08    <1>  	test	byte [ufont], 8
  6909 00003454 7407                <1> 	jz	short lt8_8_0
  6910 00003456 BE00500900          <1> 	mov	esi, VGAFONT8USER
  6911 0000345B EB05                <1> 	jmp	short lt8_8_1
  6912                              <1> lt8_8_0:
  6913 0000345D BE[24580100]        <1> 	mov	esi, vgafont8	
  6914                              <1> lt8_8_1:
  6915                              <1> 	;mov	al, bl
  6916                              <1> 	;mul	bh
  6917                              <1> 	;movzx	esi, ax
  6918                              <1> 	;add	esi, vgafont8
  6919                              <1> 	;mov	al, bl
  6920                              <1> 	;sub	ah, ah
  6921                              <1> 	;shl	ax, 5 ; * 32
  6922                              <1> 	;;add	ax, dx ; blockaddr + i * 32;
  6923                              <1> 	;movzx	edi, ax ; dest
  6924                              <1> 	;add	edi, 0A0000h
  6925 00003462 0FB6CF              <1> 	movzx	ecx, bh 		
  6926 00003465 F3A4                <1> 	rep	movsb
  6927 00003467 83C718              <1> 	add	edi, 24 ; 32 - 8
  6928 0000346A FEC3                <1> 	inc	bl
  6929 0000346C 75F4                <1> 	jnz	short lt8_8_1
  6930                              <1> 	;
  6931 0000346E E8CDFEFFFF          <1> 	call	release_font_access
  6932                              <1> 	;
  6933 00003473 58                  <1> 	pop	eax
  6934                              <1> 	; if(AL>=0x10)
  6935 00003474 3C10                <1> 	cmp	al, 10h
  6936 00003476 7205                <1> 	jb	short lt8_8_2
  6937                              <1> 	; BH = 8
  6938                              <1>    	; set_scan_lines(8);
  6939 00003478 E802FFFFFF          <1> 	call	set_scan_lines
  6940                              <1> lt8_8_2:
  6941 0000347D C3                  <1> 	retn
  6942                              <1> 
  6943                              <1> load_text_8_16_pat:
  6944                              <1> 	; 05/01/2021 (TRDOS 386 v2.0.3)
  6945                              <1> 	; 26/07/2016
  6946                              <1> 	; 25/07/2016
  6947                              <1> 	; 23/07/2016
  6948                              <1> 	; 09/07/2016
  6949                              <1> 	; load user defined (EGA/VGA) text fonts
  6950                              <1> 	;
  6951                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  6952                              <1> 	; vgabios-0.7a (2011)
  6953                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  6954                              <1> 	; 'vgabios.c', 'biosfn_load_text_8_16_pat'
  6955                              <1> 
  6956                              <1> 	; biosfn_load_text_8_16_pat (AL,BL)
  6957                              <1> 
  6958                              <1> 	; get_font_access();
  6959                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  6960                              <1> 	; for(i=0;i<0x100;i++)
  6961                              <1> 	; {
  6962                              <1> 	;  src = i * 16;
  6963                              <1> 	;  dest = blockaddr + i * 32;
  6964                              <1> 	;  memcpyb(0xA000, dest, 0xC000, vgafont16+src, 16);
  6965                              <1> 	; }
  6966                              <1> 	; release_font_access();
  6967                              <1> 	; if(AL>=0x10)
  6968                              <1> 	; {
  6969                              <1> 	; set_scan_lines(16);
  6970                              <1> 	; }
  6971                              <1> 
  6972 0000347E 50                  <1> 	push	eax
  6973 0000347F E887FEFFFF          <1> 	call	get_font_access
  6974                              <1> 
  6975                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  6976                              <1> 	;mov	dl, bl
  6977                              <1> 	;and	dl, 3
  6978                              <1> 	;shl	dx, 14
  6979                              <1> 	;xchg	dx, bx
  6980                              <1> 	;and	dl, 4
  6981                              <1> 	;shl	dx, 11
  6982                              <1> 	;add	dx, bx 	
  6983                              <1>  
  6984                              <1> 	;xor	dx, dx  ; blockaddr = 0
  6985                              <1> 	; Always block 0 for TRDOS 386 ! (blockaddr=0)
  6986                              <1> 
  6987 00003484 28DB                <1> 	sub	bl, bl ; i = 0
  6988 00003486 B710                <1> 	mov	bh, 16
  6989                              <1> 	;mov	esi, vgafont16
  6990 00003488 BF00000A00          <1> 	mov	edi, 0A0000h
  6991 0000348D 0FB6C7              <1> 	movzx	eax, bh
  6992                              <1> 
  6993                              <1> 	; 05/01/2021
  6994 00003490 F605[82120300]80    <1> 	test	byte [ufont], 80h
  6995 00003497 7410                <1> 	jz	short lt8_16_0
  6996                              <1> 		; user font permission (after set mode)
  6997 00003499 F605[82120300]10    <1>  	test	byte [ufont], 16
  6998 000034A0 7407                <1> 	jz	short lt8_16_0
  6999 000034A2 BE00400900          <1> 	mov	esi, VGAFONT16USER
  7000 000034A7 EB05                <1> 	jmp	short lt8_16_1
  7001                              <1> lt8_16_0:
  7002 000034A9 BE[246E0100]        <1> 	mov	esi, vgafont16
  7003                              <1> lt8_16_1:
  7004                              <1> 	;mov	al, bl
  7005                              <1> 	;mul	bh
  7006                              <1> 	;movzx	esi, ax
  7007                              <1> 	;add	esi, vgafont16
  7008                              <1> 	;mov	al, bl ; i
  7009                              <1> 	;sub	ah, ah
  7010                              <1> 	;shl	ax, 5 ; * 32
  7011                              <1> 	;;add	ax, dx ; blockaddr + i * 32;
  7012                              <1> 	;movzx	edi, ax ; dest
  7013                              <1> 	;add	edi, 0A0000h
  7014                              <1> 	;movzx	ecx, bh
  7015 000034AE 89C1                <1> 	mov	ecx, eax ; 16	
  7016 000034B0 F3A4                <1> 	rep	movsb
  7017 000034B2 01C7                <1> 	add	edi, eax ; add edi, 16
  7018 000034B4 FEC3                <1> 	inc	bl
  7019 000034B6 75F6                <1> 	jnz	short lt8_16_1
  7020                              <1> 	;
  7021 000034B8 E883FEFFFF          <1> 	call	release_font_access
  7022                              <1> 	;
  7023 000034BD 58                  <1> 	pop	eax
  7024                              <1> 	; if(AL>=0x10)
  7025 000034BE 3C10                <1> 	cmp	al, 10h
  7026 000034C0 7205                <1> 	jb	short lt8_16_2
  7027                              <1> 	; BH = 16
  7028                              <1>    	; set_scan_lines(16);
  7029 000034C2 E8B8FEFFFF          <1> 	call	set_scan_lines
  7030                              <1> lt8_16_2:
  7031 000034C7 C3                  <1> 	retn
  7032                              <1> 
  7033                              <1> load_gfx_user_chars:
  7034                              <1> 	; 08/01/2021
  7035                              <1> 	; 05/01/2021 (TRDOS 386 v2.0.3)
  7036                              <1> 	; 08/08/2016
  7037                              <1> 	; 10/07/2016
  7038                              <1> 	; Setup User-Defined Font for Graphics Mode (VGA)
  7039                              <1> 	;
  7040                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  7041                              <1> 	; vgabios-0.7a (2011)
  7042                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  7043                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_user_chars'
  7044                              <1> 
  7045                              <1> 	; biosfn_load_gfx_user_chars (ES,BP,CX,BL,DL)
  7046                              <1> 	; /* set 0x43 INT pointer */
  7047                              <1>     	; write_word(0x0, 0x43*4, BP);
  7048                              <1>     	; write_word(0x0, 0x43*4+2, ES);
  7049                              <1> 	
  7050                              <1> 	; 08/01/2021
  7051                              <1> 		
  7052                              <1> 	; BL   screen rows code: 00H = user-specified (in DL)
  7053                              <1>         ;                        01H = 14 rows
  7054                              <1>         ;                        02H = 25 rows
  7055                              <1>         ;                        03H = 43 rows
  7056                              <1>         ; CX   bytes per character definition
  7057                              <1>         ; DL   (when BL=0) custom number of character rows on screen
  7058                              <1>         ; EBP  address of font-definition information (user's mem space)
  7059                              <1> 
  7060                              <1> 	; 05/01/2021
  7061                              <1> 	;xor	eax, eax
  7062                              <1> 	;dec	eax ; 0FFFFFFFFh (user defined fonts)
  7063                              <1> 	;mov	[VGA_INT43H], eax
  7064                              <1> 
  7065                              <1> 	; 08/01/2021
  7066                              <1> 	; ebp = video font data (buffer) address
  7067 000034C8 892D[3A8E0100]      <1> 	mov	[VGA_INT43H], ebp
  7068                              <1> 
  7069                              <1> 	; switch (BL) {
  7070                              <1> 	; case 0:
  7071                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  7072                              <1> 	;    break;
  7073 000034CE 20DB                <1> 	and	bl, bl
  7074 000034D0 7508                <1> 	jnz	short l_gfx_uc_1
  7075 000034D2 8815[C26F0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  7076 000034D8 EB23                <1> 	jmp	short l_gfx_uc_4 	
  7077                              <1> l_gfx_uc_1:
  7078                              <1> 	; case 1:
  7079                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  7080                              <1> 	;    break;
  7081 000034DA FECB                <1> 	dec	bl
  7082 000034DC 7509                <1> 	jnz	short l_gfx_uc_2
  7083                              <1> 	; bl = 1
  7084 000034DE C605[C26F0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  7085 000034E5 EB16                <1> 	jmp	short l_gfx_uc_4 	
  7086                              <1> l_gfx_uc_2:
  7087 000034E7 FECB                <1> 	dec	bl
  7088 000034E9 740B                <1> 	jz	short l_gfx_uc_3 ; bl = 2
  7089 000034EB FECB                <1> 	dec	bl
  7090 000034ED 750E                <1> 	jnz	short l_gfx_uc_4 ; bl > 3
  7091                              <1> 	; bl = 3
  7092                              <1> 	; case 3:
  7093                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  7094                              <1> 	;    break;
  7095 000034EF C605[C26F0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  7096                              <1> l_gfx_uc_3:
  7097                              <1>     	; case 2:
  7098                              <1>     	; default:
  7099                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  7100                              <1> 	;    break;
  7101                              <1> 	; bl = 2 or bl > 3
  7102 000034F6 C605[C26F0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  7103                              <1>     	; }
  7104                              <1> l_gfx_uc_4:
  7105                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, CX);
  7106 000034FD 880D[BE6F0000]      <1> 	mov	[CHAR_HEIGHT], cl
  7107                              <1> 	; }
  7108 00003503 C3                  <1> 	retn
  7109                              <1> 
  7110                              <1> load_gfx_8_14_chars:
  7111                              <1> 	; 08/08/2016
  7112                              <1> 	; 10/07/2016
  7113                              <1> 	; Setup ROM 8x14 Font for Graphics Mode (VGA)
  7114                              <1> 	;
  7115                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  7116                              <1> 	; vgabios-0.7a (2011)
  7117                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  7118                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_8_14_chars'
  7119                              <1> 
  7120                              <1> 	; biosfn_load_gfx_8_14_chars (BL)
  7121                              <1> 	; /* set 0x43 INT pointer */
  7122                              <1>     	; write_word(0x0, 0x43*4, &vgafont14);
  7123                              <1>     	; write_word(0x0, 0x43*4+2, 0xC000);
  7124 00003504 C705[3A8E0100]-     <1> 	mov	dword [VGA_INT43H], vgafont14
  7124 0000350A [24600100]          <1>
  7125                              <1> 		
  7126                              <1> 	; BL    screen rows code: 00H = user-specified (in DL)
  7127                              <1>         ;                         01H = 14 rows
  7128                              <1>         ;                         02H = 25 rows
  7129                              <1>         ;                         03H = 43 rows
  7130                              <1>         ; DL    (when BL=0) custom number of char rows on screen
  7131                              <1> 
  7132                              <1> 	; switch (BL) {
  7133                              <1> 	; case 0:
  7134                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  7135                              <1> 	;    break;
  7136 0000350E 20DB                <1> 	and	bl, bl
  7137 00003510 7508                <1> 	jnz	short l_gfx_8_14c_1
  7138 00003512 8815[C26F0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  7139 00003518 EB23                <1> 	jmp	short l_gfx_8_14c_4 	
  7140                              <1> l_gfx_8_14c_1:
  7141                              <1> 	; case 1:
  7142                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  7143                              <1> 	;    break;
  7144 0000351A FECB                <1> 	dec	bl
  7145 0000351C 7509                <1> 	jnz	short l_gfx_8_14c_2
  7146                              <1> 	; bl = 1
  7147 0000351E C605[C26F0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  7148 00003525 EB16                <1> 	jmp	short l_gfx_8_14c_4 	
  7149                              <1> l_gfx_8_14c_2:
  7150 00003527 FECB                <1> 	dec	bl
  7151 00003529 740B                <1> 	jz	short l_gfx_8_14c_3 ; bl = 2
  7152 0000352B FECB                <1> 	dec	bl
  7153 0000352D 750E                <1> 	jnz	short l_gfx_8_14c_4 ; bl > 3
  7154                              <1> 	; bl = 3
  7155                              <1> 	; case 3:
  7156                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  7157                              <1> 	;    break;
  7158 0000352F C605[C26F0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  7159                              <1> l_gfx_8_14c_3:
  7160                              <1>     	; case 2:
  7161                              <1>     	; default:
  7162                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  7163                              <1> 	;    break;
  7164                              <1> 	; bl = 2 or bl > 3
  7165 00003536 C605[C26F0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  7166                              <1>     	; }
  7167                              <1> l_gfx_8_14c_4:
  7168                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, 14);
  7169 0000353D C605[BE6F0000]0E    <1>         mov     byte [CHAR_HEIGHT], 14
  7170                              <1> 	; }
  7171 00003544 C3                  <1> 	retn	
  7172                              <1> 
  7173                              <1> load_gfx_8_8_chars:
  7174                              <1> 	; 08/08/2016
  7175                              <1> 	; 10/07/2016
  7176                              <1> 	; Setup ROM 8x14 Font for Graphics Mode (VGA)
  7177                              <1> 	;
  7178                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  7179                              <1> 	; vgabios-0.7a (2011)
  7180                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  7181                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_8_8_dd_chars'
  7182                              <1> 
  7183                              <1> 	; biosfn_load_gfx_8_8_dd_chars (BL)
  7184                              <1> 	; /* set 0x43 INT pointer */
  7185                              <1>     	; write_word(0x0, 0x43*4, &vgafont8);
  7186                              <1>     	; write_word(0x0, 0x43*4+2, 0xC000);
  7187 00003545 C705[3A8E0100]-     <1> 	mov	dword [VGA_INT43H], vgafont8
  7187 0000354B [24580100]          <1>
  7188                              <1> 		
  7189                              <1> 	; BL    screen rows code: 00H = user-specified (in DL)
  7190                              <1>         ;                         01H = 14 rows
  7191                              <1>         ;                         02H = 25 rows
  7192                              <1>         ;                         03H = 43 rows
  7193                              <1>         ; DL    (when BL=0) custom number of char rows on screen
  7194                              <1> 
  7195                              <1> 	; switch (BL) {
  7196                              <1> 	; case 0:
  7197                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  7198                              <1> 	;    break;
  7199 0000354F 20DB                <1> 	and	bl, bl
  7200 00003551 7508                <1> 	jnz	short l_gfx_8_8c_1
  7201 00003553 8815[C26F0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  7202 00003559 EB23                <1> 	jmp	short l_gfx_8_8c_4 	
  7203                              <1> l_gfx_8_8c_1:
  7204                              <1> 	; case 1:
  7205                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  7206                              <1> 	;    break;
  7207 0000355B FECB                <1> 	dec	bl
  7208 0000355D 7509                <1> 	jnz	short l_gfx_8_8c_2
  7209                              <1> 	; bl = 1
  7210 0000355F C605[C26F0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  7211 00003566 EB16                <1> 	jmp	short l_gfx_8_8c_4 	
  7212                              <1> l_gfx_8_8c_2:
  7213 00003568 FECB                <1> 	dec	bl
  7214 0000356A 740B                <1> 	jz	short l_gfx_8_8c_3 ; bl = 2
  7215 0000356C FECB                <1> 	dec	bl
  7216 0000356E 750E                <1> 	jnz	short l_gfx_8_8c_4 ; bl > 3
  7217                              <1> 	; bl = 3
  7218                              <1> 	; case 3:
  7219                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  7220                              <1> 	;    break;
  7221 00003570 C605[C26F0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  7222                              <1> l_gfx_8_8c_3:
  7223                              <1>     	; case 2:
  7224                              <1>     	; default:
  7225                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  7226                              <1> 	;    break;
  7227                              <1> 	; bl = 2 or bl > 3
  7228 00003577 C605[C26F0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  7229                              <1>     	; }
  7230                              <1> l_gfx_8_8c_4:
  7231                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, 8);
  7232 0000357E C605[BE6F0000]08    <1>         mov     byte [CHAR_HEIGHT], 8
  7233                              <1> 	; }
  7234 00003585 C3                  <1> 	retn
  7235                              <1> 
  7236                              <1> load_gfx_8_16_chars:
  7237                              <1> 	; 08/08/2016
  7238                              <1> 	; 10/07/2016
  7239                              <1> 	; Setup ROM 8x14 Font for Graphics Mode (VGA)
  7240                              <1> 	;
  7241                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  7242                              <1> 	; vgabios-0.7a (2011)
  7243                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  7244                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_8_16_chars'
  7245                              <1> 
  7246                              <1> 	; biosfn_load_gfx_8_16_chars (BL)
  7247                              <1> 	; /* set 0x43 INT pointer */
  7248                              <1>     	; write_word(0x0, 0x43*4, &vgafont16);
  7249                              <1>     	; write_word(0x0, 0x43*4+2, 0xC000);
  7250 00003586 C705[3A8E0100]-     <1> 	mov	dword [VGA_INT43H], vgafont16
  7250 0000358C [246E0100]          <1>
  7251                              <1> 		
  7252                              <1> 	; BL    screen rows code: 00H = user-specified (in DL)
  7253                              <1>         ;                         01H = 14 rows
  7254                              <1>         ;                         02H = 25 rows
  7255                              <1>         ;                         03H = 43 rows
  7256                              <1>         ; DL    (when BL=0) custom number of char rows on screen
  7257                              <1> 
  7258                              <1> 	; switch (BL) {
  7259                              <1> 	; case 0:
  7260                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  7261                              <1> 	;    break;
  7262 00003590 20DB                <1> 	and	bl, bl
  7263 00003592 7508                <1> 	jnz	short l_gfx_8_16c_1
  7264 00003594 8815[C26F0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  7265 0000359A EB23                <1> 	jmp	short l_gfx_8_16c_4 	
  7266                              <1> l_gfx_8_16c_1:
  7267                              <1> 	; case 1:
  7268                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  7269                              <1> 	;    break;
  7270 0000359C FECB                <1> 	dec	bl
  7271 0000359E 7509                <1> 	jnz	short l_gfx_8_16c_2
  7272                              <1> 	; bl = 1
  7273 000035A0 C605[C26F0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  7274 000035A7 EB16                <1> 	jmp	short l_gfx_8_16c_4 	
  7275                              <1> l_gfx_8_16c_2:
  7276 000035A9 FECB                <1> 	dec	bl
  7277 000035AB 740B                <1> 	jz	short l_gfx_8_16c_3 ; bl = 2
  7278 000035AD FECB                <1> 	dec	bl
  7279 000035AF 750E                <1> 	jnz	short l_gfx_8_16c_4 ; bl > 3
  7280                              <1> 	; bl = 3
  7281                              <1> 	; case 3:
  7282                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  7283                              <1> 	;    break;
  7284 000035B1 C605[C26F0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  7285                              <1> l_gfx_8_16c_3:
  7286                              <1>     	; case 2:
  7287                              <1>     	; default:
  7288                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  7289                              <1> 	;    break;
  7290                              <1> 	; bl = 2 or bl > 3
  7291 000035B8 C605[C26F0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  7292                              <1>     	; }
  7293                              <1> l_gfx_8_16c_4:
  7294                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, 16);
  7295 000035BF C605[BE6F0000]10    <1>         mov     byte [CHAR_HEIGHT], 16
  7296                              <1> 	; }
  7297 000035C6 C3                  <1> 	retn
  7298                              <1> 			
  7299                              <1> get_font_info:
  7300                              <1> 	; 08/01/2021 (TRDOS 386 v2.0.3)
  7301                              <1> 	; 19/09/2016
  7302                              <1> 	; 08/08/2016
  7303                              <1> 	; 10/07/2016
  7304                              <1> 	; Get Current Character Generator Info (VGA)
  7305                              <1> 	;
  7306                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  7307                              <1> 	; vgabios-0.7a (2011)
  7308                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  7309                              <1> 	; 'vgabios.c', 'biosfn_get_font_info'
  7310                              <1> 
  7311                              <1> 	; Modified for TRDOS 386 !
  7312                              <1> 	;
  7313                              <1> 	; INPUT ->
  7314                              <1> 	;    AX = 1130h
  7315                              <1> 	;    BL = 0 -> Get info for current VGA font
  7316                              <1> 	;	       (BH = unused)
  7317                              <1> 	;    19/09/2016
  7318                              <1> 	;    BL > 0 -> Get requested character font data
  7319                              <1> 	;	 BL = 1 -> vgafont8
  7320                              <1> 	;        BL = 2 -> vgafont14
  7321                              <1> 	;	 BL = 3 -> vgafont16   
  7322                              <1> 	;	;08/01/2021
  7323                              <1> 	;	 BL = 4 -> user defined 8x8 font
  7324                              <1> 	;	 BL = 5 -> user defined 8x14 font
  7325                              <1> 	;	 BL = 6 -> user defined 8x16 font
  7326                              <1> 	;	 BL > 6 -> Invalid function (for now!)
  7327                              <1> 	;	 BH = ASCII code of the first character
  7328                              <1> 	;	 ECX = Number of characters from the 1st char
  7329                              <1> 	;	 ECX >= 256 -> All (256-BH) characters
  7330                              <1> 	;	 ECX = 0 -> All characters (BH = unused)	
  7331                              <1> 	;        EDX = User's Buffer Address	
  7332                              <1> 	; OUTPUT ->
  7333                              <1> 	;    AL = height (scanlines), bytes per character
  7334                              <1> 	;    AH = screen rows
  7335                              <1> 	;    Byte 16-23 of EAX = number of columns
  7336                              <1> 	;    Byte 24-31 of EAX = 
  7337                              <1> 	;	  0 -> default font (not configured yet)
  7338                              <1> 	;	  0FFh -> user defined font
  7339                              <1> 	;	  14 = vgafont14
  7340                              <1> 	;	   8 = vgafont8
  7341                              <1> 	;	  16 = vgafont16
  7342                              <1> 	;   If BL input > 0 -> 
  7343                              <1> 	;       EAX = Actual transfer count
  7344                              <1> 	;
  7345 000035C7 20DB                <1> 	and	bl, bl
  7346 000035C9 740F                <1> 	jz	short gfi_1
  7347                              <1> 	; invalid function (input)
  7348                              <1> 	; 08/01/2021
  7349 000035CB 80FB04              <1> 	cmp	bl, 4
  7350 000035CE 7263                <1> 	jb	short gfi_5
  7351 000035D0 7441                <1> 	je	short gfi_3	
  7352 000035D2 80FB06              <1> 	cmp	bl, 6
  7353 000035D5 744C                <1> 	je	short gfi_4
  7354                              <1> 	; bh = 5 or bh > 6
  7355                              <1> gfi_0:
  7356 000035D7 31C0                <1> 	xor	eax, eax ; 0
  7357 000035D9 C3                  <1> 	retn
  7358                              <1> gfi_1:
  7359 000035DA A0[BE6F0000]        <1> 	mov	al, [CHAR_HEIGHT]
  7360 000035DF 8A25[C26F0000]      <1> 	mov	ah, [VGA_ROWS]
  7361 000035E5 C1E010              <1> 	shl	eax, 16
  7362 000035E8 A0[BC6F0000]        <1> 	mov	al, [CRT_COLS]
  7363 000035ED 8B0D[3A8E0100]      <1> 	mov	ecx, [VGA_INT43H]
  7364 000035F3 21C9                <1> 	and	ecx, ecx
  7365 000035F5 7418                <1> 	jz	short gfi_2 ; 0 = default font
  7366                              <1> 	; 08/01/2021
  7367 000035F7 FECC                <1> 	dec	ah ; 0FFh
  7368 000035F9 81F900400900        <1> 	cmp	ecx, VGAFONT16USER
  7369 000035FF 740E                <1> 	je	short gfi_2
  7370 00003601 81F900500900        <1> 	cmp	ecx, VGAFONT8USER
  7371 00003607 7406                <1> 	je	short gfi_2	
  7372 00003609 8A25[BE6F0000]      <1> 	mov	ah, [CHAR_HEIGHT] ; font size = height
  7373                              <1> gfi_2:
  7374 0000360F C1C010              <1> 	rol	eax, 16
  7375 00003612 C3                  <1> 	retn
  7376                              <1> gfi_3:
  7377                              <1> 	; 08/01/2021
  7378 00003613 F605[82120300]08    <1> 	test	byte [ufont], 08h ; 8x8 user font
  7379 0000361A 74BB                <1> 	jz	short gfi_0 ; not loaded !
  7380 0000361C BE00500900          <1> 	mov	esi, VGAFONT8USER ; *
  7381                              <1> 	;mov	bl, 8
  7382                              <1> 	;jmp	short gfi_8
  7383 00003621 EB4D                <1> 	jmp	short gfi_10
  7384                              <1> gfi_4:
  7385                              <1> 	; 08/01/2021
  7386 00003623 F605[82120300]10    <1> 	test	byte [ufont], 10h ; 8x16 user font
  7387 0000362A 74AB                <1> 	jz	short gfi_0 ; not loaded !
  7388 0000362C BE00400900          <1> 	mov	esi, VGAFONT16USER ; *
  7389 00003631 EB15                <1> 	jmp	short gfi_7
  7390                              <1> gfi_5:
  7391 00003633 80FB02              <1> 	cmp	bl, 2
  7392 00003636 7233                <1> 	jb	short gfi_9
  7393 00003638 7709                <1> 	ja	short gfi_6
  7394                              <1> 	;BL = 2 -> vgafont14
  7395 0000363A BE[24600100]        <1> 	mov	esi, vgafont14 ; *
  7396 0000363F B30E                <1> 	mov	bl, 14
  7397 00003641 EB07                <1> 	jmp	short gfi_8 
  7398                              <1> gfi_6:
  7399                              <1> 	;BL = 3 -> vgafont16
  7400 00003643 BE[246E0100]        <1> 	mov	esi, vgafont16 ; *
  7401                              <1> gfi_7:
  7402 00003648 B310                <1> 	mov	bl, 16
  7403                              <1> gfi_8:
  7404 0000364A 89D7                <1> 	mov	edi, edx ; **
  7405 0000364C 09C9                <1> 	or	ecx, ecx
  7406 0000364E 7424                <1> 	jz	short gfi_11 ; all chars from the 00h
  7407 00003650 88F8                <1> 	mov	al, bh ; character index
  7408 00003652 F6E3                <1> 	mul	bl ; char index * char height/size
  7409 00003654 0FB7D0              <1> 	movzx	edx, ax
  7410 00003657 01D6                <1> 	add	esi, edx ; *
  7411 00003659 66BAFF00            <1> 	mov	dx, 255
  7412 0000365D 28FA                <1> 	sub	dl, bh
  7413 0000365F 6642                <1> 	inc	dx	
  7414 00003661 39D1                <1> 	cmp	ecx, edx
  7415 00003663 770F                <1> 	ja	short gfi_11
  7416 00003665 7412                <1> 	je	short gfi_12
  7417 00003667 89D1                <1> 	mov	ecx, edx
  7418 00003669 EB0E                <1> 	jmp	short gfi_12
  7419                              <1> gfi_9:
  7420                              <1> 	;BL = 1 -> vgafont8
  7421 0000366B BE[24580100]        <1> 	mov	esi, vgafont8 ; *
  7422                              <1> gfi_10:
  7423 00003670 B308                <1> 	mov	bl, 8
  7424 00003672 EBD6                <1> 	jmp	short gfi_8
  7425                              <1> gfi_11:
  7426 00003674 B900010000          <1> 	mov	ecx, 256
  7427                              <1> gfi_12:
  7428                              <1> 	; 08/01/2021
  7429 00003679 89C8                <1> 	mov	eax, ecx ; character count
  7430 0000367B 30FF                <1> 	xor	bh, bh
  7431 0000367D 66F7E3              <1> 	mul	bx ; char count * char height/size	
  7432 00003680 89C1                <1>  	mov	ecx, eax
  7433                              <1> 
  7434                              <1> 	; ESI = source address in system space
  7435                              <1> 	; EDI = user's buffer address
  7436                              <1> 	; ECX = transfer (byte) count
  7437 00003682 E83DDC0000          <1> 	call	transfer_to_user_buffer
  7438 00003687 89C8                <1> 	mov	eax, ecx ; actual transfer count
  7439 00003689 C3                  <1> 	retn
  7440                              <1> 	
  7441                              <1> vga_pal_funcs:
  7442                              <1> 	; 10/08/2016
  7443                              <1> 	; VGA Palette functions
  7444                              <1> 	;
  7445                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  7446                              <1> 	; vgabios-0.7a (2011)
  7447                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  7448                              <1> 	; 'vgabios.c', 'vgarom.asm'
  7449                              <1> 
  7450 0000368A 3C00                <1> 	cmp	al, 0
  7451 0000368C 0F848F000000        <1>         je      set_single_palette_reg
  7452                              <1> vga_palf_1001:
  7453 00003692 3C01                <1> 	cmp	al, 1
  7454 00003694 0F84B4000000        <1>         je      set_overscan_border_color
  7455                              <1> vga_palf_1002:
  7456 0000369A 3C02                <1> 	cmp	al, 2
  7457 0000369C 0F84B0000000        <1>         je      set_all_palette_reg
  7458                              <1> vga_palf_1003:
  7459 000036A2 3C03                <1> 	cmp	al, 3
  7460 000036A4 0F84E8000000        <1>         je      toggle_intensity
  7461                              <1> vga_palf_1007:
  7462 000036AA 3C07                <1> 	cmp	al, 7
  7463 000036AC 0F840D010000        <1>         je      get_single_palette_reg
  7464 000036B2 7266                <1> 	jb	short vga_palf_unknown
  7465                              <1> vga_palf_1008:
  7466 000036B4 3C08                <1> 	cmp	al, 8
  7467 000036B6 0F8437010000        <1>         je      read_overscan_border_color
  7468                              <1> vga_palf_1009:
  7469 000036BC 3C09                <1> 	cmp	al, 9
  7470 000036BE 0F8433010000        <1> 	je	get_all_palette_reg
  7471                              <1> vga_palf_1010:
  7472 000036C4 3C10                <1> 	cmp	al, 10h
  7473 000036C6 0F8487010000        <1> 	je 	set_single_dac_reg
  7474 000036CC 724C                <1> 	jb	short vga_palf_unknown
  7475                              <1> vga_palf_1012:
  7476 000036CE 3C12                <1> 	cmp	al, 12h
  7477 000036D0 0F8498010000        <1>         je      set_all_dac_reg
  7478 000036D6 7242                <1> 	jb	short vga_palf_unknown
  7479                              <1> vga_palf_1013:
  7480 000036D8 3C13                <1> 	cmp	al, 13h
  7481 000036DA 0F84CC010000        <1>         je      select_video_dac_color_page
  7482                              <1> vga_palf_1015:
  7483 000036E0 3C15                <1> 	cmp	al, 15h
  7484 000036E2 0F8412020000        <1> 	je	read_single_dac_reg
  7485 000036E8 7230                <1> 	jb	short vga_palf_unknown
  7486                              <1> vga_palf_1017:
  7487 000036EA 3C17                <1> 	cmp	al, 17h
  7488 000036EC 0F8428020000        <1>         je      read_all_dac_reg
  7489 000036F2 7226                <1> 	jb	short vga_palf_unknown
  7490                              <1> vga_palf_1018:
  7491 000036F4 3C18                <1> 	cmp	al, 18h
  7492 000036F6 0F845E020000        <1>         je      set_pel_mask
  7493                              <1> vga_palf_1019:
  7494 000036FC 3C19                <1> 	cmp	al, 19h
  7495 000036FE 0F8462020000        <1>         je      read_pel_mask
  7496                              <1> vga_palf_101A:
  7497 00003704 3C1A                <1> 	cmp	al, 1Ah
  7498 00003706 0F8468020000        <1>         je      read_video_dac_state
  7499                              <1> vga_palf_101B:
  7500 0000370C 3C1B                <1> 	cmp	al, 1Bh
  7501                              <1> 	;jne	short vga_palf_unknown
  7502 0000370E 770A                <1> 	ja	short vga_palf_unknown
  7503                              <1>  
  7504 00003710 E8C3F5FFFF          <1> 	call	gray_scale_summing
  7505 00003715 E93DE4FFFF          <1>         jmp     VIDEO_RETURN 	
  7506                              <1> 
  7507                              <1> vga_palf_unknown:
  7508 0000371A 29C0                <1> 	sub	eax, eax ; 0 = invalid function
  7509 0000371C E93BE4FFFF          <1>         jmp     _video_return
  7510                              <1> 
  7511                              <1> set_single_palette_reg:
  7512                              <1> 	; 10/08/2016
  7513                              <1> 	; Set One Palette Register
  7514                              <1> 	; BL = register number to set
  7515                              <1> 	;     (a 4-bit attribute nibble: 00h-0Fh)
  7516                              <1> 	; BH = 6-bit RGB color to display 
  7517                              <1> 	;      for that attribute
  7518                              <1> 
  7519 00003721 80FB14              <1> 	cmp	bl, 14h
  7520                              <1> 	;ja	short no_actl_reg1
  7521 00003724 0F872DE4FFFF        <1> 	ja	VIDEO_RETURN
  7522 0000372A 6650                <1> 	push	ax
  7523 0000372C 6652                <1> 	push	dx
  7524 0000372E 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7525 00003732 EC                  <1> 	in	al, dx
  7526 00003733 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7527 00003737 88D8                <1> 	mov	al, bl
  7528 00003739 EE                  <1> 	out	dx, al
  7529 0000373A 88F8                <1> 	mov	al, bh
  7530 0000373C EE                  <1> 	out	dx, al
  7531 0000373D B020                <1> 	mov	al, 20h
  7532 0000373F EE                  <1> 	out	dx, al
  7533                              <1> 	; ifdef VBOX
  7534 00003740 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7535 00003744 EC                  <1> 	in	al, dx
  7536                              <1> 	; endif ; VBOX
  7537 00003745 665A                <1> 	pop	dx
  7538 00003747 6658                <1> 	pop	ax
  7539                              <1> ;no_actl_reg1:
  7540 00003749 E909E4FFFF          <1> 	jmp	VIDEO_RETURN
  7541                              <1> 
  7542                              <1> set_overscan_border_color:
  7543                              <1> 	; 10/08/2016
  7544                              <1> 	; Set Overscan/Border Color Register
  7545                              <1> 	; BH = 6-bit RGB color to display 
  7546                              <1> 	;      for that attribute
  7547                              <1> 	
  7548 0000374E B311                <1> 	mov	bl, 11h
  7549 00003750 EBCF                <1>   	jmp	short set_single_palette_reg
  7550                              <1> 
  7551                              <1> set_all_palette_reg:
  7552                              <1> 	; 10/08/2016
  7553                              <1> 	; Set All Palette Registers and Overscan
  7554                              <1> 	; EDX = Address of 17 bytes; 
  7555                              <1> 	; an rgbRGB value for each of 16 palette
  7556                              <1> 	; registers plus one for the border.
  7557                              <1> 
  7558 00003752 89D6                <1> 	mov	esi, edx ; user buffer
  7559 00003754 B911000000          <1> 	mov	ecx, 17
  7560 00003759 89E7                <1> 	mov	edi, esp
  7561 0000375B 83EC14              <1> 	sub	esp, 20	 	 
  7562 0000375E E8ABDB0000          <1> 	call	transfer_from_user_buffer
  7563                              <1> 	;jc	VIDEO_RETURN
  7564                              <1> 
  7565 00003763 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7566 00003767 EC                  <1> 	in	al, dx
  7567 00003768 B100                <1> 	mov	cl, 0
  7568 0000376A 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7569                              <1> set_palette_loop:
  7570 0000376E 88C8                <1> 	mov	al, cl
  7571 00003770 EE                  <1> 	out	dx, al
  7572 00003771 8A07                <1> 	mov	al, [edi]
  7573 00003773 EE                  <1> 	out	dx, al
  7574 00003774 47                  <1> 	inc	edi
  7575 00003775 FEC1                <1> 	inc	cl
  7576 00003777 80F910              <1> 	cmp	cl, 10h
  7577 0000377A 75F2                <1> 	jne	short set_palette_loop
  7578 0000377C B011                <1> 	mov	al, 11h
  7579 0000377E EE                  <1> 	out	dx, al
  7580 0000377F 8A07                <1> 	mov	al, [edi]
  7581 00003781 EE                  <1> 	out	dx, al
  7582 00003782 B020                <1> 	mov	al, 20h
  7583 00003784 EE                  <1> 	out	dx, al
  7584                              <1> 	; ifdef VBOX
  7585 00003785 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7586 00003789 EC                  <1> 	in	al, dx
  7587                              <1> 	; endif ; VBOX
  7588 0000378A 83C414              <1> 	add	esp, 20
  7589 0000378D E9C5E3FFFF          <1> 	jmp	VIDEO_RETURN
  7590                              <1> 
  7591                              <1> toggle_intensity:
  7592                              <1> 	; 10/08/2016
  7593                              <1> 	; Select Foreground Blink or Bold Background
  7594                              <1> 	; BL = 00h = enable bold backgrounds
  7595                              <1> 	;	    (16 background colors)
  7596                              <1>         ;      01h = enable blinking foreground
  7597                              <1> 	;	    (8 background colors)
  7598                              <1> 
  7599 00003792 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7600 00003796 EC                  <1> 	in	al, dx
  7601 00003797 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7602 0000379B B010                <1> 	mov	al, 10h
  7603 0000379D EE                  <1> 	out	dx, al
  7604 0000379E 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  7605 000037A2 EC                  <1> 	in	al, dx
  7606 000037A3 24F7                <1> 	and	al, 0F7h
  7607 000037A5 80E301              <1> 	and	bl, 01h
  7608 000037A8 C0E303              <1> 	shl	bl, 3
  7609 000037AB 08D8                <1> 	or	al, bl
  7610 000037AD 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7611 000037B1 EE                  <1> 	out	dx, al
  7612 000037B2 B020                <1> 	mov	al, 20h
  7613 000037B4 EE                  <1> 	out	dx, al
  7614                              <1> 	; ifdef VBOX
  7615 000037B5 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7616 000037B9 EC                  <1> 	in	al, dx
  7617                              <1> 	; endif ; VBOX
  7618 000037BA E998E3FFFF          <1> 	jmp	VIDEO_RETURN
  7619                              <1> 
  7620                              <1> get_single_palette_reg:
  7621                              <1> 	; 10/08/2016
  7622                              <1> 	; Read One Palette Register
  7623                              <1>         ; INPUT:
  7624                              <1> 	; BL = Palette register to read (00h-0Fh)
  7625                              <1> 	; OUTPUT:
  7626                              <1> 	; BH = Current rgbRGB value of specified register
  7627                              <1> 	;      for that attribute
  7628                              <1> 
  7629 000037BF 80FB14              <1> 	cmp	bl, 14h
  7630                              <1> 	;ja	short no_actl_reg2
  7631 000037C2 0F878FE3FFFF        <1> 	ja	VIDEO_RETURN
  7632                              <1> 
  7633 000037C8 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7634 000037CC EC                  <1> 	in	al, dx
  7635 000037CD 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7636 000037D1 88D8                <1> 	mov	al, bl
  7637 000037D3 EE                  <1> 	out	dx, al
  7638 000037D4 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  7639 000037D8 EC                  <1> 	in	al, dx
  7640 000037D9 8844240D            <1> 	mov	[esp+13], al ; bh
  7641 000037DD 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7642 000037E1 EC                  <1> 	in	al, dx
  7643 000037E2 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7644 000037E6 B020                <1> 	mov	al, 20h
  7645 000037E8 EE                  <1> 	out	dx, al
  7646                              <1> 	; ifdef VBOX
  7647 000037E9 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7648 000037ED EC                  <1> 	in	al, dx
  7649                              <1> 	; endif ; VBOX
  7650 000037EE E964E3FFFF          <1> 	jmp	VIDEO_RETURN
  7651                              <1> 
  7652                              <1> read_overscan_border_color:
  7653                              <1> 	; 10/08/2016
  7654                              <1> 	; Read Overscan Register
  7655                              <1> 	; OUTPUT:
  7656                              <1> 	; BH = current rgbRGB value 
  7657                              <1> 	;      of the overscan/border register
  7658                              <1> 
  7659 000037F3 B311                <1> 	mov	bl, 11h
  7660 000037F5 EBC8                <1> 	jmp	short get_single_palette_reg
  7661                              <1> 
  7662                              <1> get_all_palette_reg:
  7663                              <1> 	; 10/08/2016
  7664                              <1> 	; Read All Palette Registers
  7665                              <1> 	; EDX = Address of 17-byte buffer 
  7666                              <1> 	;	to receive data
  7667                              <1> 	
  7668 000037F7 89D7                <1> 	mov	edi, edx
  7669 000037F9 89E3                <1> 	mov	ebx, esp
  7670 000037FB 89DE                <1> 	mov	esi, ebx
  7671 000037FD 83EC14              <1> 	sub	esp, 20	 
  7672                              <1> 
  7673 00003800 B100                <1> 	mov	cl, 0
  7674                              <1> get_palette_loop:
  7675 00003802 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7676 00003806 EC                  <1> 	in	al, dx
  7677 00003807 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7678 0000380B 88C8                <1> 	mov	al, cl
  7679 0000380D EE                  <1> 	out	dx, al
  7680 0000380E 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  7681 00003812 EC                  <1> 	in	al, dx
  7682 00003813 8803                <1> 	mov	[ebx], al
  7683 00003815 43                  <1> 	inc	ebx
  7684 00003816 FEC1                <1> 	inc	cl
  7685 00003818 80F910              <1> 	cmp	cl, 10h
  7686 0000381B 75E5                <1> 	jne	short get_palette_loop
  7687 0000381D 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7688 00003821 EC                  <1> 	in	al, dx
  7689 00003822 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7690 00003826 B011                <1> 	mov	al, 11h
  7691 00003828 EE                  <1> 	out	dx, al
  7692 00003829 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  7693 0000382D EC                  <1> 	in	al, dx
  7694 0000382E 8803                <1> 	mov	[ebx], al
  7695 00003830 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7696 00003834 EC                  <1> 	in	al, dx
  7697 00003835 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7698 00003839 B020                <1> 	mov	al, 20h
  7699 0000383B EE                  <1> 	out	dx, al
  7700                              <1> 	; ifdef VBOX
  7701 0000383C 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7702 00003840 EC                  <1> 	in	al, dx
  7703                              <1> 	; endif ; VBOX
  7704                              <1> 
  7705 00003841 B911000000          <1> 	mov	ecx, 17 ; transfer (byte) count
  7706                              <1> 	; ESI = source address in system space
  7707                              <1> 	; EDI = user's buffer address
  7708 00003846 E879DA0000          <1> 	call	transfer_to_user_buffer
  7709                              <1> 
  7710 0000384B 83C414              <1> 	add	esp, 20
  7711 0000384E E904E3FFFF          <1> 	jmp	VIDEO_RETURN
  7712                              <1> 
  7713                              <1> set_single_dac_reg:
  7714                              <1> 	; 10/08/2016
  7715                              <1> 	; Set One DAC Color Register
  7716                              <1> 	; BX = color register to set (0-255)
  7717                              <1>         ; CH = green value (00h-3Fh)
  7718                              <1>         ; CL = blue value  (00h-3Fh)
  7719                              <1>         ; DH = red value   (00h-3Fh)
  7720                              <1> 
  7721 00003853 6652                <1> 	push	dx
  7722 00003855 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  7723 00003859 88D8                <1> 	mov	al, bl
  7724 0000385B EE                  <1> 	out	dx, al
  7725                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  7726 0000385C 6642                <1> 	inc	dx
  7727 0000385E 6658                <1> 	pop	ax
  7728 00003860 88E0                <1> 	mov	al, ah
  7729 00003862 EE                  <1> 	out	dx, al
  7730 00003863 88E8                <1> 	mov	al, ch
  7731 00003865 EE                  <1> 	out	dx, al
  7732 00003866 88C8                <1> 	mov	al, cl
  7733 00003868 EE                  <1> 	out	dx, al
  7734 00003869 E9E9E2FFFF          <1> 	jmp	VIDEO_RETURN
  7735                              <1> 
  7736                              <1> set_all_dac_reg:
  7737                              <1> 	; 12/08/2016
  7738                              <1> 	; 11/08/2016
  7739                              <1> 	; 10/08/2016
  7740                              <1> 	; Set a Block of DAC Color Register
  7741                              <1> 	; BX = first DAC register to set (0-00FFh)
  7742                              <1> 	; ECX = number of registers to set (0-00FFh)
  7743                              <1> 	; EDX = addr of a table of R,G,B values 
  7744                              <1> 	;	(it will be CX*3 bytes long)
  7745                              <1> 
  7746 0000386E 89D6                <1> 	mov	esi, edx ; user buffer
  7747 00003870 89CA                <1> 	mov	edx, ecx
  7748 00003872 66D1E1              <1> 	shl	cx, 1 ; *2
  7749 00003875 01D1                <1> 	add	ecx, edx ; ecx = 3*ecx
  7750 00003877 89E5                <1> 	mov	ebp, esp
  7751 00003879 89EF                <1> 	mov	edi, ebp
  7752 0000387B 29CF                <1> 	sub	edi, ecx
  7753 0000387D 6683E7FC            <1> 	and	di, 0FFFCh ; (dword alignment)
  7754 00003881 89FC                <1> 	mov	esp, edi
  7755 00003883 E886DA0000          <1> 	call	transfer_from_user_buffer
  7756                              <1> 	;jc	VIDEO_RETURN
  7757                              <1> 
  7758 00003888 89D1                <1> 	mov	ecx, edx
  7759 0000388A 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  7760 0000388E 88D8                <1> 	mov	al, bl
  7761 00003890 EE                  <1> 	out	dx, al
  7762 00003891 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  7763                              <1> set_dac_loop:
  7764 00003895 8A07                <1> 	mov	al, [edi]
  7765 00003897 EE                  <1> 	out	dx, al
  7766 00003898 47                  <1> 	inc	edi
  7767 00003899 8A07                <1> 	mov	al, [edi]
  7768 0000389B EE                  <1> 	out	dx, al
  7769 0000389C 47                  <1> 	inc	edi
  7770 0000389D 8A07                <1> 	mov	al, [edi]
  7771 0000389F EE                  <1> 	out	dx, al
  7772 000038A0 47                  <1> 	inc	edi
  7773 000038A1 6649                <1> 	dec	cx
  7774 000038A3 75F0                <1> 	jnz	short set_dac_loop
  7775 000038A5 89EC                <1> 	mov	esp, ebp
  7776 000038A7 E9ABE2FFFF          <1> 	jmp	VIDEO_RETURN
  7777                              <1> 
  7778                              <1> select_video_dac_color_page:
  7779                              <1> 	; 10/08/2016
  7780                              <1> 	; DAC Color Paging Functions
  7781                              <1> 	; BL = 00H = select color paging mode
  7782                              <1>         ;       BH = paging mode
  7783                              <1>         ;            00h = 4 blocks of 64 registers
  7784                              <1>         ;            01h = 16 blocks of 16 registers
  7785                              <1> 	; BL = 01H = activate color page
  7786                              <1>         ;       BH = DAC color page number
  7787                              <1>         ;            00h-03h (4-page/64-reg mode)
  7788                              <1>         ;            00h-0Fh (16-page/16-reg mode)
  7789                              <1> 
  7790 000038AC 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7791 000038B0 EC                  <1> 	in	al, dx
  7792 000038B1 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7793 000038B5 B010                <1> 	mov	al, 10h
  7794 000038B7 EE                  <1> 	out	dx, al
  7795 000038B8 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  7796 000038BC EC                  <1> 	in	al, dx
  7797 000038BD 80E301              <1> 	and	bl, 01h
  7798 000038C0 750E                <1> 	jnz	short set_dac_page
  7799 000038C2 247F                <1> 	and	al, 07Fh
  7800 000038C4 C0E707              <1> 	shl	bh, 7
  7801 000038C7 08F8                <1> 	or	al, bh
  7802 000038C9 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7803 000038CD EE                  <1> 	out	dx, al
  7804 000038CE EB1D                <1> 	jmp	short set_actl_normal
  7805                              <1> set_dac_page:
  7806 000038D0 6650                <1> 	push	ax
  7807 000038D2 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7808 000038D6 EC                  <1> 	in	al, dx
  7809 000038D7 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7810 000038DB B014                <1> 	mov	al, 14h
  7811 000038DD EE                  <1> 	out	dx, al
  7812 000038DE 6658                <1> 	pop	ax
  7813 000038E0 2480                <1> 	and	al, 80h
  7814 000038E2 7503                <1> 	jnz	short set_dac_16_page
  7815 000038E4 C0E702              <1> 	shl	bh, 2
  7816                              <1> set_dac_16_page:
  7817 000038E7 80E70F              <1> 	and	bh, 0Fh
  7818 000038EA 88F8                <1> 	mov	al, bh
  7819 000038EC EE                  <1> 	out	dx, al
  7820                              <1> set_actl_normal:
  7821 000038ED B020                <1> 	mov	al, 20h
  7822 000038EF EE                  <1> 	out	dx, al
  7823                              <1> 	; ifdef VBOX
  7824 000038F0 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7825 000038F4 EC                  <1> 	in	al, dx
  7826                              <1> 	; endif ; VBOX
  7827 000038F5 E95DE2FFFF          <1> 	jmp	VIDEO_RETURN	
  7828                              <1> 
  7829                              <1> read_single_dac_reg:
  7830                              <1> 	; 10/08/2016
  7831                              <1> 	; Read One DAC Color Register
  7832                              <1> 	; INPUT:
  7833                              <1> 	; BX = color register to read (0-255)
  7834                              <1> 	; OUTPUT:
  7835                              <1> 	; CH = green value (00h-3Fh)
  7836                              <1>         ; CL = blue value  (00h-3Fh)
  7837                              <1>         ; DH = red value   (00h-3Fh)
  7838                              <1> 
  7839 000038FA 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  7840 000038FE 88D8                <1> 	mov	al, bl
  7841 00003900 EE                  <1> 	out	dx, al
  7842 00003901 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  7843 00003905 EC                  <1> 	in	al, dx
  7844 00003906 88442415            <1> 	mov	[esp+21], al ; dh
  7845 0000390A EC                  <1> 	in	al, dx
  7846 0000390B 88C5                <1> 	mov	ch, al
  7847 0000390D EC                  <1> 	in	al, dx
  7848 0000390E 88C1                <1> 	mov	cl, al
  7849 00003910 66894C2410          <1> 	mov	[esp+16], cx ; cx
  7850 00003915 E93DE2FFFF          <1> 	jmp	VIDEO_RETURN	
  7851                              <1> 
  7852                              <1> read_all_dac_reg:
  7853                              <1> 	; 12/08/2016
  7854                              <1> 	; 11/08/2016
  7855                              <1> 	; 10/08/2016
  7856                              <1> 	; Read a Block of DAC Color Registers
  7857                              <1>         ; BX = first DAC register to read (0-00FFh)
  7858                              <1>         ; ECX = number of registers to read (0-00FFh)
  7859                              <1>         ; EDX = addr of a buffer to hold R,G,B values
  7860                              <1> 	;	(CX*3 bytes long)
  7861                              <1> 
  7862 0000391A 89D7                <1> 	mov	edi, edx ; user buffer
  7863 0000391C 89CA                <1> 	mov	edx, ecx
  7864 0000391E 66D1E2              <1> 	shl	dx, 1 ; *2
  7865 00003921 01CA                <1> 	add	edx, ecx ; edx = 3*ecx
  7866 00003923 89E5                <1> 	mov	ebp, esp
  7867 00003925 89EE                <1> 	mov	esi, ebp
  7868 00003927 29D6                <1> 	sub	esi, edx
  7869 00003929 6683E6FC            <1> 	and	si, 0FFFCh ; (dword alignment)
  7870 0000392D 89F4                <1> 	mov	esp, esi
  7871 0000392F 52                  <1> 	push	edx ; 3*ecx
  7872 00003930 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  7873 00003934 88D8                <1> 	mov	al, bl
  7874 00003936 EE                  <1> 	out	dx, al
  7875 00003937 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  7876 0000393B 89F3                <1> 	mov	ebx, esi
  7877                              <1> read_dac_loop:
  7878 0000393D EC                  <1> 	in	al, dx
  7879 0000393E 8803                <1> 	mov	[ebx], al
  7880 00003940 43                  <1> 	inc	ebx
  7881 00003941 EC                  <1> 	in	al, dx
  7882 00003942 8803                <1> 	mov	[ebx], al
  7883 00003944 43                  <1> 	inc	ebx
  7884 00003945 EC                  <1> 	in	al, dx
  7885 00003946 8803                <1> 	mov	[ebx], al
  7886 00003948 43                  <1> 	inc	ebx
  7887 00003949 6649                <1> 	dec	cx
  7888 0000394B 75F0                <1> 	jnz	short read_dac_loop
  7889 0000394D 59                  <1> 	pop	ecx ; 3*ecx
  7890                              <1> 	; ECX = transfer (byte) count
  7891                              <1> 	; ESI = source address in system space
  7892                              <1> 	; EDI = user's buffer address
  7893 0000394E E871D90000          <1> 	call	transfer_to_user_buffer
  7894 00003953 89EC                <1> 	mov	esp, ebp
  7895 00003955 E9FDE1FFFF          <1> 	jmp	VIDEO_RETURN
  7896                              <1> 
  7897                              <1> set_pel_mask:
  7898                              <1> 	; 10/08/2016
  7899                              <1> 	; BL = mask value
  7900 0000395A 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK
  7901 0000395E 88D8                <1> 	mov	al, bl
  7902 00003960 EE                  <1> 	out	dx, al
  7903 00003961 E9F1E1FFFF          <1> 	jmp	VIDEO_RETURN
  7904                              <1> 
  7905                              <1> read_pel_mask:
  7906                              <1> 	; 10/08/2016
  7907                              <1> 	; Output: BL = mask value 
  7908 00003966 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK
  7909 0000396A EC                  <1> 	in	al, dx
  7910 0000396B 8844240C            <1> 	mov	[esp+12], al ; bl
  7911 0000396F E9E3E1FFFF          <1> 	jmp	VIDEO_RETURN
  7912                              <1> 
  7913                              <1> read_video_dac_state:
  7914                              <1> 	; 10/08/2016
  7915                              <1> 	; Query DAC Color Paging State
  7916                              <1> 	; Output:
  7917                              <1> 	; BH = current active DAC color page
  7918                              <1>         ; BL = current active DAC paging mode
  7919                              <1> 
  7920 00003974 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7921 00003978 EC                  <1> 	in	al, dx
  7922 00003979 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7923 0000397D B010                <1> 	mov	al, 10h
  7924 0000397F EE                  <1> 	out	dx, al
  7925 00003980 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  7926 00003984 EC                  <1> 	in	al, dx
  7927 00003985 88C3                <1> 	mov	bl, al
  7928 00003987 C0EB07              <1> 	shr	bl, 7
  7929 0000398A 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7930 0000398E EC                  <1> 	in	al, dx
  7931 0000398F 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7932 00003993 B014                <1> 	mov	al, 14h
  7933 00003995 EE                  <1> 	out	dx, al
  7934 00003996 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  7935 0000399A EC                  <1> 	in	al, dx
  7936 0000399B 88C7                <1> 	mov	bh, al
  7937 0000399D 80E70F              <1> 	and	bh, 0Fh
  7938 000039A0 F6C301              <1> 	test	bl, 01
  7939 000039A3 7503                <1> 	jnz	short get_dac_16_page
  7940 000039A5 C0EF02              <1> 	shr	bh, 2
  7941                              <1> get_dac_16_page:
  7942 000039A8 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7943 000039AC EC                  <1> 	in	al, dx
  7944 000039AD 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  7945 000039B1 B020                <1> 	mov	al, 20h
  7946 000039B3 EE                  <1> 	out	dx, al
  7947                              <1> 	; ifdef VBOX
  7948 000039B4 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  7949 000039B8 EC                  <1> 	in	al, dx
  7950                              <1> 	; endif ; VBOX 
  7951 000039B9 66895C240C          <1> 	mov	[esp+12], bx ; bx
  7952 000039BE E994E1FFFF          <1> 	jmp	VIDEO_RETURN
  7953                              <1> 
  7954                              <1> ; 23/11/2020 - TRDOS 386 v2.0.3
  7955                              <1> ; VBE 2 BOCHS/QEMU emulator extensions 
  7956                              <1> ;	for TRDOS 386 v2 kernel (video bios)  
  7957                              <1> 
  7958                              <1> ; BOCH/QEMU VBE2 VGA BIOS code 
  7959                              <1> ;	by Jeroen Janssen (2002)
  7960                              <1> ;	by Volker Rupper (2003-2020)
  7961                              <1> ; vbe.c (02/01/2020) 
  7962                              <1> 
  7963                              <1> ; vbe.h (02/01/2020)
  7964                              <1> 
  7965                              <1> VBE_DISPI_BANK_ADDRESS	equ	0A0000h
  7966                              <1> VBE_DISPI_BANK_SIZE_KB	equ	64
  7967                              <1> 
  7968                              <1> VBE_DISPI_MAX_XRES	equ	2560
  7969                              <1> VBE_DISPI_MAX_YRES	equ	1600
  7970                              <1> 
  7971                              <1> VBE_DISPI_IOPORT_INDEX	equ	01CEh
  7972                              <1> VBE_DISPI_IOPORT_DATA	equ	01CFh
  7973                              <1> 
  7974                              <1> VBE_DISPI_INDEX_ID	equ	00h
  7975                              <1> VBE_DISPI_INDEX_XRES	equ	01h
  7976                              <1> VBE_DISPI_INDEX_YRES	equ	02h
  7977                              <1> VBE_DISPI_INDEX_BPP	equ	03h
  7978                              <1> VBE_DISPI_INDEX_ENABLE	equ	04h
  7979                              <1> VBE_DISPI_INDEX_BANK	equ	05h
  7980                              <1> VBE_DISPI_INDEX_VIRT_WIDTH equ	06h
  7981                              <1> VBE_DISPI_INDEX_VIRT_HEIGHT equ	07h
  7982                              <1> VBE_DISPI_INDEX_X_OFFSET equ	08h
  7983                              <1> VBE_DISPI_INDEX_Y_OFFSET equ	09h
  7984                              <1> VBE_DISPI_INDEX_VIDEO_MEMORY_64K equ 0Ah
  7985                              <1> VBE_DISPI_INDEX_DDC	equ	0Bh
  7986                              <1> 
  7987                              <1> VBE_DISPI_ID0		equ	0B0C0h
  7988                              <1> VBE_DISPI_ID1		equ	0B0C1h
  7989                              <1> VBE_DISPI_ID2		equ	0B0C2h
  7990                              <1> VBE_DISPI_ID3		equ	0B0C3h
  7991                              <1> VBE_DISPI_ID4		equ	0B0C4h
  7992                              <1> VBE_DISPI_ID5		equ	0B0C5h
  7993                              <1> 
  7994                              <1> VBE_DISPI_DISABLED	equ	00h
  7995                              <1> VBE_DISPI_ENABLED	equ	01h
  7996                              <1> VBE_DISPI_GETCAPS	equ	02h
  7997                              <1> VBE_DISPI_8BIT_DAC	equ	20h
  7998                              <1> VBE_DISPI_LFB_ENABLED	equ	40h
  7999                              <1> VBE_DISPI_NOCLEARMEM	equ	80h
  8000                              <1> 
  8001                              <1> VBE_DISPI_LFB_PHYSICAL_ADDRESS equ 0E0000000h
  8002                              <1> 
  8003                              <1> ; ***
  8004                              <1> 
  8005                              <1> ;// VBE Return Status Info
  8006                              <1> ;// AL
  8007                              <1> VBE_RETURN_STATUS_SUPPORTED	equ	4Fh
  8008                              <1> VBE_RETURN_STATUS_UNSUPPORTED	equ	00h
  8009                              <1> ;// AH
  8010                              <1> VBE_RETURN_STATUS_SUCCESSFULL	equ	00h
  8011                              <1> VBE_RETURN_STATUS_FAILED	equ	01h
  8012                              <1> VBE_RETURN_STATUS_NOT_SUPPORTED	equ	02h
  8013                              <1> VBE_RETURN_STATUS_INVALID	equ	03h
  8014                              <1> 
  8015                              <1> ;// VBE Mode Numbers
  8016                              <1> 
  8017                              <1> VBE_MODE_VESA_DEFINED		equ	0100h
  8018                              <1> VBE_MODE_REFRESH_RATE_USE_CRTC	equ	0800h
  8019                              <1> VBE_MODE_LINEAR_FRAME_BUFFER	equ	4000h
  8020                              <1> VBE_MODE_PRESERVE_DISPLAY_MEMORY equ	8000h
  8021                              <1> 
  8022                              <1> ;// Mode Attributes
  8023                              <1> 
  8024                              <1> VBE_MODE_ATTRIBUTE_SUPPORTED		   equ	0001h
  8025                              <1> VBE_MODE_ATTRIBUTE_EXTENDED_INFO_AVAILABLE equ	0002h
  8026                              <1> VBE_MODE_ATTRIBUTE_COLOR_MODE		   equ	0008h
  8027                              <1> VBE_MODE_ATTRIBUTE_GRAPHICS_MODE	   equ	0010h
  8028                              <1> VBE_MODE_ATTRIBUTE_LINEAR_FRAME_BUFFER_MODE equ	0080h
  8029                              <1> VBE_MODE_ATTRIBUTE_DOUBLE_SCAN_MODE	   equ	0100h
  8030                              <1> VBE_MODE_ATTRIBUTE_INTERLACE_MODE	   equ	0200h
  8031                              <1> 
  8032                              <1> ;// Window attributes
  8033                              <1> 
  8034                              <1> VBE_WINDOW_ATTRIBUTE_RELOCATABLE equ	01h
  8035                              <1> VBE_WINDOW_ATTRIBUTE_READABLE	 equ	02h
  8036                              <1> VBE_WINDOW_ATTRIBUTE_WRITEABLE	 equ	04h
  8037                              <1> 
  8038                              <1> ;/* Video memory */
  8039                              <1> VGAMEM_GRAPH equ 0A000h
  8040                              <1> VGAMEM_CTEXT equ 0B800h
  8041                              <1> ;VGAMEM_MTEXT equ 0B000h
  8042                              <1> 
  8043                              <1> ;// Memory model
  8044                              <1> 
  8045                              <1> ;VBE_MEMORYMODEL_TEXT_MODE	equ	00h
  8046                              <1> ;VBE_MEMORYMODEL_CGA_GRAPHICS	equ	01h
  8047                              <1> ;VBE_MEMORYMODEL_PLANAR		equ	03h
  8048                              <1> VBE_MEMORYMODEL_PACKED_PIXEL	equ	04h
  8049                              <1> ;VBE_MEMORYMODEL_NON_CHAIN_4_256 equ	05h
  8050                              <1> VBE_MEMORYMODEL_DIRECT_COLOR	equ	06h
  8051                              <1> ;VBE_MEMORYMODEL_YUV		equ	07h
  8052                              <1> 
  8053                              <1> ;// DirectColorModeInfo
  8054                              <1> 
  8055                              <1> ;VBE_DIRECTCOLOR_COLOR_RAMP_PROGRAMMABLE equ 01h
  8056                              <1> VBE_DIRECTCOLOR_RESERVED_BITS_AVAILABLE equ 02h
  8057                              <1> 
  8058                              <1> VBE_DISPI_TOTAL_VIDEO_MEMORY_MB	equ 16
  8059                              <1> 
  8060                              <1> ; 24/11/2020
  8061                              <1> ; vbe.c
  8062                              <1> 
  8063                              <1> %if 1
  8064                              <1> 
  8065                              <1> _vbe_biosfn_return_mode_info:
  8066                              <1> 	; 15/12/2020
  8067                              <1> 	; 12/12/2020
  8068                              <1> 	; Return VBE Mode Information	
  8069                              <1> 	; (call from 'sysvideo')
  8070                              <1> 	;
  8071                              <1> 	; Input:
  8072                              <1> 	;	cx = video (bios) mode
  8073                              <1> 	; Output:
  8074                              <1> 	;	cf = 0 -> (successful)
  8075                              <1> 	;	   MODE_INFO_LIST addr contains MODEINFO
  8076                              <1> 	;	cf = 1 -> error
  8077                              <1> 	;
  8078                              <1> 	; Modified registers: eax, edx, edi
  8079                              <1> 	;
  8080                              <1> 
  8081                              <1> 	; pushes for subroutine stack pops compatibility
  8082                              <1> 	
  8083                              <1> 	;push	ds  ; *
  8084                              <1> 	;push	es  ; **
  8085                              <1> 
  8086 000039C3 55                  <1> 	push	ebp ; ***
  8087 000039C4 56                  <1> 	push	esi ; **** 
  8088                              <1> 	
  8089 000039C5 31FF                <1> 	xor	edi, edi  ; mov edi, 0
  8090                              <1> 
  8091 000039C7 803D[54090000]03    <1> 	cmp	byte [vbe3], 3
  8092 000039CE 7221                <1> 	jb	short _vbe_rmi_1
  8093                              <1> 
  8094                              <1> 	;sub	edi, edi  ; 0 = kernel call (sign)
  8095                              <1> 	;	; no transfer to user's buffer
  8096                              <1> 	
  8097                              <1> 	; cx = Video mode (for 4F01h, with LFB flag)
  8098                              <1> 
  8099 000039D0 66B8014F            <1> 	mov	ax, 4F01h
  8100                              <1> 
  8101 000039D4 E82ADFFFFF          <1> 	call	_vbe3_pmfn_return_mode_info
  8102                              <1> 
  8103 000039D9 6683F84F            <1> 	cmp	ax, 004Fh
  8104 000039DD 7533                <1> 	jne	short _vbe_rmi_2 ; fail
  8105                              <1> 
  8106                              <1> 	; 15/12/2020
  8107                              <1> 	; cx = vbe video mode
  8108 000039DF 80E501              <1> 	and	ch, 01h ; clear LFB flag
  8109 000039E2 BEFE7B0900          <1> 	mov	esi, VBE3MODEINFOBLOCK - 2
  8110 000039E7 66890E              <1> 	mov	[esi], cx ; MODEINFO.mode
  8111 000039EA E8A6000000          <1> 	call	set_lfbinfo_table
  8112 000039EF EB22                <1> 	jmp	short _vbe_rmi_3  ; cf = 0 
  8113                              <1> _vbe_rmi_1:
  8114 000039F1 803D[54090000]02    <1> 	cmp	byte [vbe3], 2
  8115 000039F8 7219                <1> 	jb	short _vbe_rmi_3 ; cf = 1
  8116 000039FA A0[55090000]        <1> 	mov	al, [vbe2bios] ; 0C0h-0C5h for emu (*)
  8117 000039FF 3CC0                <1> 	cmp	al, 0C0h ; BOCHS/QEMU/VIRTUALBOX (*) ? 
  8118 00003A01 7210                <1> 	jb	short _vbe_rmi_3  ; cf = 1
  8119 00003A03 3CC5                <1> 	cmp	al, 0C5h ; (*)
  8120 00003A05 770B                <1> 	ja	short _vbe_rmi_2 ; unknown vbios !? 
  8121                              <1> 	
  8122                              <1> 	;xor	edi, edi  ; 0 = kernel call (sign)
  8123                              <1> 	;	; no transfer to user's buffer
  8124                              <1> 
  8125                              <1> 	;mov	ax, 4F01h
  8126                              <1> 
  8127                              <1> 	; cx = Video mode (for 4F01h, with LFB flag)
  8128                              <1> 
  8129 00003A07 E80A000000          <1> 	call	vbe_biosfn_return_mode_info
  8130 00003A0C 6683F84F            <1> 	cmp	ax, 004Fh ; successful ?
  8131 00003A10 7401                <1> 	je	short _vbe_rmi_3  ; cf = 0
  8132                              <1> _vbe_rmi_2:
  8133 00003A12 F9                  <1> 	stc
  8134                              <1> 	; cf = 1	
  8135                              <1> _vbe_rmi_3:
  8136 00003A13 5E                  <1> 	pop	esi ; ****
  8137 00003A14 5D                  <1> 	pop	ebp ; ***
  8138                              <1> 	
  8139                              <1> 	;pop	es  ; **
  8140                              <1> 	;pop	ss  ; *
  8141                              <1> 	
  8142 00003A15 C3                  <1> 	retn
  8143                              <1> 
  8144                              <1> 
  8145                              <1> ; * (TRDOS 386, INT 31h, VESA Video Bios functions) 
  8146                              <1> ; * ---------------------------------------------------------
  8147                              <1> ; * Function 01h - Return VBE Mode Information
  8148                              <1> ; * ---------------------------------------------------------
  8149                              <1> ; * Input:
  8150                              <1> ; *		AX = 4F01h
  8151                              <1> ; *		CX = Mode number
  8152                              <1> ; *    (ES:DI) EDI = Pointer to ModeInfoBlock structure	
  8153                              <1> ; * Output:
  8154                              <1> ; *		AX = VBE Return Status
  8155                              <1> ; * 
  8156                              <1> ; *----------------------------------------------------------
  8157                              <1> ; *
  8158                              <1> 
  8159                              <1> vbe_biosfn_return_mode_info:
  8160                              <1> 	; 15/12/2020 
  8161                              <1> 	; 14/12/2020
  8162                              <1> 	; 12/12/2020
  8163                              <1> 	; 11/12/2020 (TRDOS 386 v2.0.3)
  8164                              <1> 	;
  8165                              <1> 	; Input:
  8166                              <1> 	;	cx = video (bios) mode
  8167                              <1> 	;      edi = ModeInfoBlock buffer address
  8168                              <1> 	;	     (in user's memory space)		
  8169                              <1> 	;      (ax = 4F01h)
  8170                              <1> 	; Output:
  8171                              <1> 	;	ax = 004Fh (successful)
  8172                              <1> 	;	ah > 0 -> error
  8173                              <1> 	;
  8174                              <1> 	; Modified registers: esi
  8175                              <1> 
  8176                              <1> 	;;push	ds  ; *
  8177                              <1> 	;;push	es  ; **
  8178                              <1> 	;;push	ebp ; ***
  8179                              <1> 	;;push	esi ; **** 
  8180                              <1> 
  8181 00003A16 F6C501              <1> 	test	ch, 1
  8182 00003A19 7505                <1> 	jnz	short vbe_rmi_1
  8183                              <1> 
  8184                              <1> 	; mode number < 100h
  8185                              <1> 	; CGA/VGA mode is not proper this VBE function 
  8186                              <1> 
  8187 00003A1B 29C0                <1> 	sub	eax, eax
  8188                              <1> vbe_rmi_0:	
  8189                              <1> 	;mov	ax, 0100h  ; Function is not supported
  8190 00003A1D B401                <1> 	mov	ah, 1
  8191 00003A1F C3                  <1> 	retn
  8192                              <1> vbe_rmi_1:
  8193 00003A20 52                  <1> 	push	edx ; *****
  8194 00003A21 51                  <1> 	push	ecx ; ******
  8195 00003A22 53                  <1> 	push	ebx ; *******	
  8196 00003A23 57                  <1> 	push	edi ; ********
  8197                              <1> 	
  8198                              <1> 	; 14/12/2020
  8199 00003A24 89CB                <1> 	mov	ebx, ecx
  8200                              <1>  			
  8201                              <1> 	;xor	eax, eax
  8202 00003A26 80E7C1              <1> 	and	bh, 0C1h ; use bit 15, 14, 8 only (for bh)
  8203 00003A29 883D[1D120300]      <1> 	mov	[vbe_mode_x], bh
  8204                              <1> 	;and	bx, 1FFh
  8205 00003A2F 80E701              <1> 	and	bh, 1
  8206                              <1> 	;mov	bh, 1
  8207                              <1> 
  8208                              <1> 	; Alternative 2 (instead of 'Mode_info_find_mode')
  8209 00003A32 E88A060000          <1> 	call	set_mode_info_list ; (alternative 2)
  8210                              <1> 
  8211                              <1> 	; eax = 0	
  8212                              <1> 
  8213                              <1> 	;mov	bx, [esi] ; mode
  8214                              <1> 
  8215                              <1> 	; Alternative 1 (instead of 'set_mode_info_list')
  8216                              <1> 	;call	mode_info_find_mode ; (alternative 1)
  8217                              <1> 
  8218 00003A37 09F6                <1> 	or	esi, esi
  8219                              <1> 	; 14/12/2020
  8220 00003A39 744D                <1> 	jz	short vbe_rmi_4	; VBE mode number is wrong
  8221                              <1> 				; or it is not supported
  8222                              <1> 
  8223                              <1> 	; 15/12/2020
  8224                              <1> 	;mov	bx, [esi] ; mode
  8225                              <1> 
  8226                              <1> 	; 12/12/2020
  8227                              <1> 	;call	set_lfbinfo_table
  8228                              <1> 
  8229 00003A3B F605[1D120300]40    <1> 	test	byte [vbe_mode_x], 40h ; LFB model ?
  8230 00003A42 7404                <1> 	jz	short vbe_rmi_2
  8231                              <1> 	
  8232 00003A44 C6461C01            <1> 	mov	byte [esi+MODEINFO.NumberOfBanks], 1
  8233                              <1> vbe_rmi_2:
  8234                              <1> 	; (vbe.c, 02/01/2020, vruppert)
  8235                              <1> 	; 11/12/2020 (Erdogan Tan, video.s) 
  8236                              <1> 	; Bochs Graphics Adapter
  8237                              <1> 	; vendor_id: 1111h, device id: 1234h
  8238                              <1> 
  8239 00003A48 E855070000          <1> 	call	pci_get_lfb_addr
  8240                              <1> 	;or	eax, eax
  8241 00003A4D 7404                <1> 	jz	short vbe_rmi_3
  8242                              <1> 	; zf = 0, ax > 0 (high word of LFB address)
  8243                              <1> 	; set/change LFB address in MODEINFO structure
  8244 00003A4F 6689462C            <1> 	mov	[esi+MODEINFO.PhysBasePtr+2], ax
  8245                              <1> 	; 12/12/2020
  8246                              <1> 	;mov	[edi+LFBINFO.LFB_addr+2], ax
  8247                              <1> vbe_rmi_3:
  8248                              <1> 	;test	byte [esi+MODEINFO.WinAAttributes], 1 
  8249                              <1> 	;		; VBE_WINDOW_ATTRIBUTE_RELOCATABLE = 1
  8250                              <1>         ;jz	short vbe_rmi_4
  8251                              <1> 	;; 11/12/2020
  8252                              <1> 	;; In fact, this is far call address in (Bochs/BGA) Video Bios
  8253                              <1> 	;; Direct user access to kernel subroutines is not possible 
  8254                              <1> 	;; in TRDOS 386. Also, TRDOS 386 kernel will support only LFB.
  8255                              <1> 	;; Bank select may be a seperate sysvideo function in future
  8256                              <1> 	;; (if it will be required).
  8257                              <1> 	;mov	dword [esi+MODEINFO.WinFuncPtr], dispi_set_bank_farcall
  8258                              <1> ;vbe_rmi_4:
  8259                              <1> 	; 12/12/2020
  8260 00003A53 E83D000000          <1> 	call	set_lfbinfo_table
  8261                              <1> 
  8262                              <1> 	; 11/12/2020
  8263                              <1> 	; copy 68 bytes of MODE_INFO_LIST to user
  8264                              <1> 
  8265 00003A58 8B3C24              <1> 	mov	edi, [esp]  ; user's buffer address
  8266                              <1> 	; 12/12/2020
  8267 00003A5B 09FF                <1> 	or	edi, edi ; 0 = kernel call 
  8268                              <1> 			 ; (call from '_vbe_biosfn_return_mode_info')
  8269 00003A5D 7432                <1> 	jz	short vbe_rmi_6
  8270                              <1> 
  8271                              <1> 	; 15/12/2020
  8272                              <1> 	; prepare 256 bytes MODEINFO buffer at VBE3MODEINFOBLOCK
  8273                              <1> 	; and then, copy buffer conttent to user's buffer
  8274 00003A5F 57                  <1> 	push	edi
  8275 00003A60 BE[3C120300]        <1> 	mov	esi, MODE_INFO_LIST + 2	; MODEINFO.ModeAttributes
  8276 00003A65 BF007C0900          <1> 	mov	edi, VBE3MODEINFOBLOCK
  8277 00003A6A B910000000          <1> 	mov	ecx, 66/4  ; 66 bytes
  8278 00003A6F F3A5                <1> 	rep	movsd
  8279 00003A71 31C0                <1> 	xor	eax, eax
  8280 00003A73 B12F                <1> 	mov	cl, (256-68)/4 ; 188 bytes
  8281 00003A75 F3AB                <1> 	rep	stosd
  8282 00003A77 66AB                <1> 	stosw	; 2 bytes
  8283 00003A79 5F                  <1> 	pop	edi
  8284 00003A7A BE007C0900          <1> 	mov	esi, VBE3MODEINFOBLOCK
  8285                              <1> 	;mov	cx, 256 
  8286 00003A7F FEC5                <1> 	inc	ch ; cx = 256
  8287 00003A81 E83ED80000          <1> 	call	transfer_to_user_buffer
  8288 00003A86 7309                <1> 	jnc	short vbe_rmi_5
  8289                              <1> vbe_rmi_4:
  8290                              <1> 	;mov	eax, 014Fh ; fail/error
  8291 00003A88 31C0                <1> 	xor	eax, eax
  8292 00003A8A B401                <1> 	mov	ah, 01h
  8293                              <1> 	;jmp	short vbe_rmi_6
  8294 00003A8C E981000000          <1> 	jmp	vbe_sm_ret1 ; 11/12/2020
  8295                              <1> vbe_rmi_5:
  8296                              <1> 	; 256 bytes of MODEINFO have been transferred to user
  8297                              <1> 	;mov	eax, 4Fh ; succesfull
  8298                              <1> vbe_rmi_6: ; 12/12/2020
  8299 00003A91 31C0                <1> 	xor	eax, eax
  8300                              <1> ;vbe_rmi_6:
  8301 00003A93 EB7D                <1> 	jmp	vbe_sm_ret1 ; 11/12/2020
  8302                              <1> 
  8303                              <1> 	;pop	edi ; ********
  8304                              <1> 	;pop	ebx ; *******
  8305                              <1> 	;pop	ecx ; ******
  8306                              <1> 	;pop	edx ; *****	
  8307                              <1> 	
  8308                              <1> 	;;pop	esi ; ****
  8309                              <1> 	;;pop	ebp ; ***
  8310                              <1> 	;;pop	es  ; **
  8311                              <1> 	;;pop	ds  ; * 
  8312                              <1> 
  8313                              <1> 	;retn
  8314                              <1> 
  8315                              <1> set_lfbinfo_table:
  8316                              <1> 	; 19/12/2020
  8317                              <1> 	; 11/12/2020
  8318                              <1> 	; Set/Fill LFBINFO structure/table
  8319                              <1> 	;
  8320                              <1> 	; Input:
  8321                              <1> 	;	esi = Mode info list address 
  8322                              <1> 	; Output:
  8323                              <1> 	;	LFB_Info address is filled with LFBINFO
  8324                              <1> 	;	edi = LFB_Info address
  8325                              <1> 	;
  8326                              <1> 	; Modified registers: eax, edx (=0), edi
  8327                              <1> 
  8328 00003A95 BF[2A120300]        <1> 	mov	edi, LFB_Info
  8329 00003A9A 8B462A              <1> 	mov	eax, [esi+MODEINFO.PhysBasePtr]
  8330 00003A9D 894702              <1> 	mov	[edi+LFBINFO.LFB_addr], eax ; LFB address
  8331                              <1> 	;mov	ax, [esi+MODEINFO.mode]
  8332 00003AA0 668B06              <1> 	mov	ax, [esi]
  8333 00003AA3 668907              <1> 	mov	[edi+LFBINFO.mode],ax
  8334 00003AA6 8A461B              <1> 	mov	al, [esi+MODEINFO.BitsPerPixel]
  8335 00003AA9 88470E              <1> 	mov	[edi+LFBINFO.bpp], al
  8336 00003AAC 29C0                <1> 	sub	eax, eax
  8337 00003AAE 668B4614            <1> 	mov	ax, [esi+MODEINFO.XResolution]
  8338 00003AB2 6689470A            <1> 	mov	[edi+LFBINFO.X_res], ax
  8339 00003AB6 89C2                <1> 	mov	edx, eax ; 19/12/2020
  8340 00003AB8 668B4616            <1> 	mov	ax, [esi+MODEINFO.YResolution]
  8341 00003ABC 6689470C            <1> 	mov	[edi+LFBINFO.Y_res], ax
  8342                              <1> 	; eax = Y_res ; screen height
  8343                              <1> 	; 19/12/2020	
  8344 00003AC0 F7E2                <1> 	mul	edx ; X_res*Y_res
  8345                              <1> 	; edx = 0
  8346 00003AC2 8A570E              <1> 	mov	dl, [edi+LFBINFO.bpp]
  8347                              <1> 	; Note:
  8348                              <1> 	; Bits per pixel may be 8,16,24,32 for TRDOS 386 v2.
  8349                              <1> 	; (4 bits for pixel is not used for VESA modes here)
  8350 00003AC5 C0EA03              <1> 	shr	dl, 3 ; convert bits to byte
  8351 00003AC8 F7E2                <1> 	mul	edx
  8352                              <1> 	; eax = screen/page/buffer size in bytes
  8353 00003ACA 894706              <1> 	mov	[edi+LFBINFO.LFB_size], eax
  8354                              <1> 	; edx = 0
  8355                              <1> 	; clear reserved byte in LFBINFO structure/table
  8356 00003ACD 88570F              <1> 	mov	[edi+LFBINFO.reserved], dl ; not necessary
  8357 00003AD0 C3                  <1> 	retn
  8358                              <1> 
  8359                              <1> ; * (TRDOS 386, INT 31h, VESA Video Bios functions) 
  8360                              <1> ; * ---------------------------------------------------------
  8361                              <1> ; * Function 02h - Set VBE Mode
  8362                              <1> ; * ---------------------------------------------------------
  8363                              <1> ; * Input:
  8364                              <1> ; *		AX = 4F02h
  8365                              <1> ; *		BX = Desired Mode to set
  8366                              <1> ; * Output:
  8367                              <1> ; *		AX = VBE Return Status
  8368                              <1> ; * 
  8369                              <1> ; *----------------------------------------------------------
  8370                              <1> ; *
  8371                              <1> 
  8372                              <1> vbe_biosfn_set_mode:
  8373                              <1> 	; 12/12/2020
  8374                              <1> 	; 11/12/2020 (LFBINFO table for VESA VBE modes)
  8375                              <1> 	; 27/11/2020
  8376                              <1> 	; 25/11/2020
  8377                              <1> 	; 23/11/2020 (TRDOS 386 v2.0.3)
  8378                              <1> 	; (ref: vbe.c, 02/01/2020, vruppert)
  8379                              <1> 	;
  8380                              <1> 	; Input:
  8381                              <1> 	;	bx = video (bios) mode
  8382                              <1> 	;	ax = 4F02h
  8383                              <1> 	; Output:
  8384                              <1> 	;	ax = 004Fh (successful)
  8385                              <1> 	;	ah > 0 -> error
  8386                              <1> 	;
  8387                              <1> 	; Modified registers: esi
  8388                              <1> 
  8389                              <1> 	; 27/11/2020
  8390                              <1> 
  8391                              <1> 	;;push	ds  ; *
  8392                              <1> 	;;push	es  ; **
  8393                              <1> 	;;push	ebp ; ***
  8394                              <1> 	;;push	esi ; **** 
  8395                              <1> 	
  8396                              <1> 	; 11/12/2020 			
  8397 00003AD1 52                  <1> 	push	edx ; *****
  8398 00003AD2 51                  <1> 	push	ecx ; ******
  8399 00003AD3 53                  <1> 	push	ebx ; *******	
  8400 00003AD4 57                  <1> 	push	edi ; ********
  8401                              <1> 
  8402                              <1> 	;xor	eax, eax
  8403 00003AD5 80E7C1              <1> 	and	bh, 0C1h ; use bit 15, 14, 8 only (for bh)
  8404 00003AD8 883D[1D120300]      <1> 	mov	[vbe_mode_x], bh
  8405 00003ADE 80E701              <1> 	and	bh, 1
  8406 00003AE1 753C                <1> 	jnz	short vbe_sm_3  ; VESA VBE mode
  8407                              <1> 
  8408                              <1>  	;;test	bx, 4000h ; VBE_MODE_LINEAR_FRAME_BUFFER
  8409                              <1> 	;test	bh, 40h
  8410                              <1> 	;jz	short vbe_sm_0
  8411                              <1> 	;; lfb_flag
  8412                              <1> 	;mov	al, 40h	; VBE_DISPI_LFB_ENABLED
  8413                              <1> vbe_sm_0:
  8414                              <1> 	; 27/11/2020
  8415 00003AE3 B080                <1> 	mov	al, 80h
  8416                              <1> 	;test	bh, 80h ; VBE_MODE_PRESERVE_DISPLAY_MEMORY 	
  8417                              <1> 	;jnz	short vbe_sm_1 ; no_clear
  8418                              <1> 	;; clear
  8419                              <1> 	;sub	al, al ; 0
  8420 00003AE5 8405[1D120300]      <1> 	test	[vbe_mode_x], al ; 80h
  8421 00003AEB 7402                <1> 	jz	short vbe_sm_1 ; clear display memory
  8422                              <1> 	; no_clear
  8423 00003AED 08C3                <1> 	or	bl, al ; VBE_MODE_PRESERVE_DISPLAY_MEMORY
  8424                              <1> vbe_sm_1:
  8425                              <1> 	; check non vesa mode
  8426                              <1> 	;;cmp	bx, 100h ; VBE_MODE_VESA_DEFINED
  8427                              <1> 	;;jna	short vbe_sm_2
  8428                              <1> 	;and	bh, 1
  8429                              <1> 	;jnz	short vbe_sm_3 
  8430                              <1> 
  8431                              <1> 	; BX <= 1FFh
  8432                              <1> 
  8433                              <1> 	; 27/11/2020
  8434                              <1> 	;or	bl, al	; al = 80h if no_clear option is set 
  8435                              <1> 	;		; al = 0 if no_clear option is not set 
  8436                              <1> 
  8437                              <1> 	; 25/11/2020
  8438                              <1> 	; VBE DISPI will be disabled in 'biosfn_set_video_mode'
  8439                              <1>  
  8440                              <1> 	;xor	al, al ; 0 ; VBE_DISPI_DISABLED
  8441                              <1> 	;call	dispi_set_enable
  8442                              <1> 
  8443                              <1> 	; call the vgabios in order to set the video mode
  8444                              <1> 	; this allows for going back to textmode with a VBE call
  8445                              <1> 	; (some applications expect that to work)
  8446                              <1> 
  8447                              <1> 	;and	bx, 0FFh
  8448                              <1> 	
  8449                              <1> 	; 27/11/2020
  8450                              <1> biosfn_set_video_mode:
  8451                              <1> 	; _call: call subroutine
  8452                              <1> 	; 26/11/2020 (TRDOS 386 v2.0.3)
  8453                              <1> 	; (ref: vgabios.c, 02/01/2020, vruppert)
  8454                              <1> 	; Input:
  8455                              <1> 	;	bl = VGA video (bios) mode
  8456                              <1> 	; Output:
  8457                              <1> 	;	cf = 1 -> error
  8458                              <1> 	;	cf = 0 -> ok
  8459                              <1> 	;
  8460                              <1> 	; Modified registers: esi
  8461                              <1> 
  8462                              <1> 	; 'dispi_set_enable(VBE_DISPI_DISABLED);'
  8463                              <1> 	
  8464                              <1> 	;mov	ax, 0 ; VBE_DISPI_DISABLED 
  8465 00003AEF 31C0                <1> 	xor	eax, eax ; 0 
  8466 00003AF1 E8A3040000          <1> 	call	dispi_set_enable
  8467                              <1> 	
  8468 00003AF6 88D8                <1> 	mov	al, bl
  8469                              <1> 	;jmp	_set_mode ; (in 'biosfn_set_video_mode' sub)
  8470 00003AF8 E86BE0FFFF          <1> 	call	_set_mode ; will return with cf=1 only if
  8471                              <1> 			; desired mode is not implemented
  8472                              <1> 	; _retn: return from subroutine
  8473 00003AFD 721A                <1> 	jc	short vbe_sm_2 ; 25/11/2020
  8474                              <1> 
  8475                              <1> 	; 26/11/2020
  8476 00003AFF 31C0                <1> 	xor	eax, eax 
  8477 00003B01 A0[BA6F0000]        <1> 	mov	al, [CRT_MODE]
  8478                              <1> 	; 27/11/2020
  8479 00003B06 8A25[278E0100]      <1> 	mov	ah, [noclearmem] ; 80h or 0
  8480                              <1> 	;and	ah 80h
  8481 00003B0C 66A3[1E120300]      <1> 	mov	[video_mode], ax ; bit 15 = no_clear flag
  8482                              <1> 				 ; bit 14 = 0 (not LFB model)
  8483                              <1> vbe_sm_ret1:
  8484                              <1> 	; 11/12/2020
  8485                              <1> 	; (vbe_rmi_4 and vbe_rmi_6 jump here)
  8486                              <1> 	; 27/11/2020
  8487 00003B12 B04F                <1> 	mov	al, 4Fh ; Function call successful
  8488                              <1> 	; eax = 004Fh
  8489                              <1> vbe_sm_ret2:
  8490                              <1> 	; 11/12/2020
  8491 00003B14 5F                  <1> 	pop	edi ; ********
  8492 00003B15 5B                  <1> 	pop	ebx ; *******
  8493 00003B16 59                  <1> 	pop	ecx ; ******
  8494 00003B17 5A                  <1> 	pop	edx ; *****
  8495                              <1> 
  8496                              <1> 	;;pop	esi ; ****
  8497                              <1> 	;;pop	ebp ; ***
  8498                              <1> 	;;pop	es  ; **
  8499                              <1> 	;;pop	ds  ; * 
  8500                              <1> 
  8501 00003B18 C3                  <1> 	retn
  8502                              <1> 
  8503                              <1> vbe_sm_2:
  8504                              <1> 	;mov	ax, 0100h ; Function is not supported
  8505                              <1> 	; 27/11/2020
  8506 00003B19 31C0                <1> 	xor	eax, eax
  8507 00003B1B B401                <1> 	mov	ah, 01h
  8508                              <1> 	; eax = 0100h
  8509                              <1> 	;retn
  8510 00003B1D EBF5                <1> 	jmp	short vbe_sm_ret2
  8511                              <1> 
  8512                              <1> vbe_sm_3:
  8513                              <1> 	; 12/12/2020
  8514                              <1> 	; check current mode, if it is 03h
  8515                              <1> 	; save page contents and cursor positions
  8516 00003B1F 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 03h
  8517 00003B26 75BB                <1> 	jne	short vbe_sm_0
  8518 00003B28 E8F0E2FFFF          <1> 	call	save_mode3_multiscreen
  8519                              <1> 	; set current mode to extended (SVGA) mode
  8520                              <1> 	;mov	byte [CRT_MODE], 0FFh ; VESA VBE mode
  8521                              <1> vbe_sm_4:
  8522                              <1> 	; 27/11/2020
  8523                              <1> 	; bx = mode (bit 0 to 8)
  8524                              <1> 
  8525                              <1> 	; 25/11/2020
  8526                              <1> 
  8527                              <1> 	; Alternative 2 (instead of 'Mode_info_find_mode')
  8528                              <1> 	;push	edi
  8529 00003B2D E88F050000          <1> 	call	set_mode_info_list ; (alternative 2)	
  8530                              <1> 	;pop	edi
  8531                              <1> 
  8532                              <1> 	;mov	bx, [esi] ; mode
  8533                              <1> 
  8534                              <1> 	; Alternative 1 (instead of 'set_mode_info_list')
  8535                              <1> 	;call	mode_info_find_mode ; (alternative 1)
  8536                              <1> 
  8537 00003B32 09F6                <1> 	or	esi, esi
  8538 00003B34 74E3                <1> 	jz	short vbe_sm_2 ; VBE mode number is wrong
  8539                              <1> 			       ; or it is not supported
  8540                              <1> 
  8541                              <1> 	; 11/12/2020
  8542 00003B36 668B1E              <1> 	mov	bx, [esi] ; mode
  8543                              <1> 
  8544                              <1> 	; 27/11/2020
  8545 00003B39 0A3D[1D120300]      <1> 	or	bh, [vbe_mode_x]
  8546                              <1> 
  8547                              <1> 	; save VESA VBE mode
  8548 00003B3F 66891D[1E120300]    <1> 	mov	[video_mode], bx
  8549                              <1> 		; 27/11/2020
  8550                              <1> 		; bit 0 to 8 = VESA VBE mode
  8551                              <1> 		; bit 9 to 13 = 0 (bit 0 to 13 = mode)
  8552                              <1> 		; bit 14 = Linear/Flat Frame Buffer flag
  8553                              <1> 		; bit 15 = 'memory not cleared
  8554                              <1> 		;	   at last mode set' flag
  8555                              <1> 
  8556                              <1> 	; first disable current mode
  8557                              <1> 	; (when switching between vesa modes)
  8558                              <1> 	; 'dispi_set_enable(VBE_DISPI_DISABLED);'        
  8559                              <1> 
  8560                              <1> 	;mov	ax, VBE_DISPI_DISABLED ; 0
  8561 00003B46 29C0                <1> 	sub	eax, eax ; 0
  8562                              <1> 
  8563 00003B48 E84C040000          <1> 	call	dispi_set_enable
  8564                              <1> 
  8565                              <1> 	; 11/12/2020
  8566 00003B4D 8A461B              <1> 	mov	al, [esi+MODEINFO.BitsPerPixel]
  8567                              <1> 	; ah = 0
  8568                              <1> 
  8569                              <1> 	;cmp	byte [esi+MODEINFO.BitsPerPixel], 8
  8570 00003B50 3C08                <1> 	cmp	al, 8
  8571 00003B52 750B                <1> 	jne	short vbe_sm_5
  8572                              <1> 
  8573                              <1> 	; 11/12/2020
  8574                              <1> 	;push	edi
  8575 00003B54 50                  <1> 	push	eax
  8576                              <1> 	; 'load_dac_palette(3);'
  8577 00003B55 56                  <1> 	push	esi
  8578 00003B56 B403                <1> 	mov	ah, 3  ; palette3, 256 colors
  8579 00003B58 E828F1FFFF          <1> 	call	load_dac_palette
  8580 00003B5D 5E                  <1> 	pop	esi
  8581                              <1> 	; 11/12/2020
  8582 00003B5E 58                  <1> 	pop	eax
  8583                              <1> 	;pop	edi
  8584                              <1> vbe_sm_5:	
  8585                              <1>   	;'dispi_set_bpp(cur_info->info.BitsPerPixel);'
  8586                              <1> 	; 11/12/2020 (al = bits per pixel, ah = 0)
  8587                              <1> 	;xor	ah, ah
  8588                              <1> 	;mov	al, [esi+MODEINFO.BitsPerPixel]
  8589 00003B5F E849040000          <1> 	call	dispi_set_bpp
  8590                              <1>         ;'dispi_set_xres(cur_info->info.XResolution);'
  8591 00003B64 668B4614            <1> 	mov	ax, [esi+MODEINFO.XResolution]
  8592 00003B68 E846040000          <1> 	call	dispi_set_xres
  8593                              <1>         ;'dispi_set_yres(cur_info->info.YResolution);'
  8594 00003B6D 668B4616            <1> 	mov	ax, [esi+MODEINFO.YResolution]
  8595 00003B71 E843040000          <1> 	call	dispi_set_yres
  8596                              <1> 
  8597                              <1> 	;'dispi_set_bank(0);'
  8598                              <1> 	;xor	ax, ax
  8599 00003B76 31C0                <1> 	xor	eax, eax ; 0
  8600 00003B78 E842040000          <1> 	call	dispi_set_bank
  8601                              <1>         ;'dispi_set_enable(VBE_DISPI_ENABLED|no_clear|lfb_flag);'
  8602                              <1> 	;mov	ax, di
  8603                              <1> 	; ah = 0 ; 27/11/2020
  8604 00003B7D A0[1D120300]        <1> 	mov	al, [vbe_mode_x] ; restore VBE mode bit 14 & 15
  8605 00003B82 0C01                <1> 	or	al, 1 ; VBE_DISPI_ENABLED
  8606 00003B84 E810040000          <1> 	call	dispi_set_enable
  8607                              <1> 
  8608                              <1>         ; 'vga_compat_setup();'
  8609 00003B89 E846040000          <1> 	call	vga_compat_setup
  8610                              <1> 
  8611                              <1> 	; 11/12/2020
  8612 00003B8E E802FFFFFF          <1> 	call	set_lfbinfo_table
  8613                              <1> 
  8614                              <1> 	; 26/11/2020
  8615 00003B93 31C0                <1> 	xor	eax, eax
  8616 00003B95 FEC8                <1> 	dec	al 
  8617 00003B97 A2[BA6F0000]        <1> 	mov	[CRT_MODE], al ; 0FFh = VESA VBE mode sign
  8618                              <1> 
  8619                              <1> 	; 27/11/2020
  8620 00003B9C E971FFFFFF          <1> 	jmp	vbe_sm_ret1 ; Function call successful
  8621                              <1> 	
  8622                              <1> 	; 27/11/2020
  8623                              <1> 	;mov	al, 4Fh
  8624                              <1> 	;	; eax = 004Fh = Function call successful
  8625                              <1> 	;jmp	short vbe_sm_ret2
  8626                              <1> 
  8627                              <1> ; * (TRDOS 386, INT 31h, VESA Video Bios functions) 
  8628                              <1> ; * ---------------------------------------------------------
  8629                              <1> ; * Function 03h - Return Current VBE Mode
  8630                              <1> ; * ---------------------------------------------------------
  8631                              <1> ; * Input:
  8632                              <1> ; *		AX = 4F03h
  8633                              <1> ; * Output:
  8634                              <1> ; *		AX = VBE Return Status
  8635                              <1> ; *		BX = Current VBE Mode
  8636                              <1> ; * 
  8637                              <1> ; *----------------------------------------------------------
  8638                              <1> ; *
  8639                              <1> 
  8640                              <1> vbe_biosfn_return_current_mode:
  8641                              <1> 	; 11/12/2020
  8642                              <1> 	; 27/11/2020 (TRDOS 386 v2.0.3)
  8643                              <1> 	; (ref: vbe.c, 02/01/2020, vruppert)
  8644                              <1> 	;
  8645                              <1> 	; Input:
  8646                              <1> 	;	none
  8647                              <1> 	; Output:
  8648                              <1> 	;	ax = 004Fh (successful)
  8649                              <1> 	;	ah > 0 -> error
  8650                              <1> 	;	bx = current video (bios) mode (if ah = 0)
  8651                              <1> 	;
  8652                              <1> 	; Modified registers: eax, ebx
  8653                              <1> 
  8654                              <1> 	; 27/11/2020
  8655                              <1> 
  8656                              <1> 	;;push	ds  ; *
  8657                              <1> 	;;push	es  ; **
  8658                              <1> 	;;push	ebp ; ***
  8659                              <1> 	;;push	esi ; **** 
  8660                              <1> 	 			
  8661                              <1> 	;push	edx ; *****
  8662                              <1> 
  8663                              <1> 	; (vbe.c)
  8664                              <1> 	;call	dispi_get_enable
  8665                              <1> 	;	; ax = vbe display interface status
  8666                              <1> 	;and	al, 1 ; VBE_DISPI_ENABLED
  8667                              <1> 	;jnz	short vbe_gm_1  ; VBE graphics mode
  8668                              <1> 
  8669 00003BA1 A0[BA6F0000]        <1> 	mov	al, [CRT_MODE] ; current cga/vga mode
  8670 00003BA6 3CFF                <1> 	cmp	al, 0FFh ; VBE extension signature
  8671 00003BA8 720E                <1> 	jb	short vbe_gm_1 ; get CGA/VGA mode
  8672                              <1> 
  8673                              <1> 	; get VBE mode
  8674                              <1> vbe_gm_0:
  8675 00003BAA 66A1[1E120300]      <1> 	mov	ax, [video_mode]
  8676                              <1> 		; BX bits:
  8677                              <1> 		; bit 0 to 8 = VESA VBE video mode
  8678                              <1> 		; bit 9 to 13 = 0 
  8679                              <1> 		; bit 14 = last mode set LFB option
  8680                              <1> 		;	   1 - linear/flat frame buffer
  8681                              <1> 		;	   0 - windowed frame buffer
  8682                              <1> 		; bit 15 = last mode set no_clear option		
  8683                              <1> 		;	   0 - video memory cleared
  8684                              <1> 		;	   1 - video memory not cleared
  8685                              <1> 	
  8686                              <1> vbe_gm_return:
  8687                              <1> 	;pop	edx ; ******
  8688 00003BB0 0FB7D8              <1> 	movzx	ebx, ax
  8689                              <1> ;vbe_srs_retn:
  8690 00003BB3 31C0                <1> 	xor	eax, eax ; 0
  8691 00003BB5 B04F                <1> 	mov	al, 4Fh ; ax = 004Fh (successful)
  8692 00003BB7 C3                  <1> 	retn	
  8693                              <1> 
  8694                              <1> vbe_gm_1:
  8695                              <1> 	; legacy (old, standard) CGA/VGA bios video mode
  8696 00003BB8 8A25[278E0100]      <1> 	mov	ah, [noclearmem] ; 80h or 0
  8697                              <1> 		; BX bits: 
  8698                              <1> 		; bit 0 to 7 = video mode
  8699                              <1> 		; bit 8 to 13 = 0 
  8700                              <1> 		; bit 14 = 0 (not LFB mode) CGA/VGA
  8701                              <1> 		; bit 15 = 1 if [noclearmem] = 80h
  8702                              <1> 		;	   0 if [noclearmem] = 0
  8703 00003BBE EBF0                <1> 	jmp	short vbe_gm_return
  8704                              <1> 
  8705                              <1> ; * (TRDOS 386, INT 31h, VESA Video Bios functions) 
  8706                              <1> ; * ---------------------------------------------------------
  8707                              <1> ; * Function 04h - Save/Restore State
  8708                              <1> ; * ---------------------------------------------------------
  8709                              <1> ; * Input:
  8710                              <1> ; *		AX = 4F04h
  8711                              <1> ; *             DL = 00h Return Save/Restore State buff size
  8712                              <1> ; *                  01h Save State
  8713                              <1> ; *                  02h Restore State
  8714                              <1> ; *             CX = Requested states
  8715                              <1> ; *		     bit 0 - controller hardware state
  8716                              <1> ; *		     bit 1 - BIOS data state
  8717                              <1> ; *		     bit 2 - DAC state
  8718                              <1> ; *		     bit 3 - register state
  8719                              <1> ; *    (ES:BX) EBX = Pointer to buffer (if DL <> 00h)
  8720                              <1> ; * Output:
  8721                              <1> ; *		AX = VBE Return Status
  8722                              <1> ; *		BX = Number of 64-byte blocks 
  8723                              <1> ; *		     to hold the state buffer (if DL=00h)
  8724                              <1> ; * 
  8725                              <1> ; *----------------------------------------------------------
  8726                              <1> ; *
  8727                              <1> 
  8728                              <1> vbe_biosfn_save_restore_state:
  8729                              <1> 	; 23/01/2021
  8730                              <1> 	; 16/01/2021
  8731                              <1> 	; 14/01/2021
  8732                              <1> 	; 13/01/2021
  8733                              <1> 	; 12/01/2021
  8734                              <1> 	; 11/01/2021 (TRDOS 386 v2.0.3)
  8735                              <1> 	; (ref: vbe.c, 02/01/2020, vruppert)
  8736                              <1> 	;
  8737                              <1> 	; Input:
  8738                              <1> 	;	dl = sub function
  8739                              <1> 	;	cl = requested state
  8740                              <1> 	;      ebx = pointer to buffer (if dl<>00h) 
  8741                              <1> 	; Output:
  8742                              <1> 	;	ax = 004Fh (successful)
  8743                              <1> 	;	ah > 0 -> error
  8744                              <1> 	;	bx = Number of 64-byte blocks 
  8745                              <1> 	;	     to hold the state buffer (if DL=00h)
  8746                              <1> 
  8747                              <1> 	; Modified registers: eax, ebx, edi
  8748                              <1> 	
  8749                              <1> 	; 14/01/2021
  8750 00003BC0 09DB                <1> 	or	ebx, ebx ; user's buffer address
  8751 00003BC2 750A                <1> 	jnz	short _vbe_biosfn_save_restore_state
  8752                              <1> 
  8753 00003BC4 20D2                <1> 	and	dl, dl
  8754 00003BC6 7406                <1> 	jz	short _vbe_biosfn_save_restore_state
  8755                              <1> 
  8756                              <1> 	; function failed
  8757                              <1> 	;mov	eax, 0100h
  8758                              <1> 	;xor	eax, eax
  8759                              <1> 	;inc	ah  ; eax = 0100h
  8760                              <1> 	; 16/01/2021
  8761 00003BC8 B84F010000          <1> 	mov	eax, 014Fh
  8762 00003BCD C3                  <1> 	retn
  8763                              <1> 
  8764                              <1> _vbe_biosfn_save_restore_state:
  8765                              <1> 	; 23/01/2021
  8766                              <1> 	; 14/01/2021
  8767                              <1> 	; ebx = 0 if the caller is kernel ('sysvideo')
  8768                              <1> 
  8769                              <1> 	; 13/01/2021
  8770 00003BCE 57                  <1> 	push	edi
  8771 00003BCF 52                  <1> 	push	edx
  8772 00003BD0 51                  <1> 	push	ecx
  8773                              <1> 
  8774                              <1> 	; 23/01/2021
  8775                              <1> 	; 12/01/2021
  8776 00003BD1 80FA02              <1> 	cmp	dl, 2
  8777 00003BD4 7757                <1> 	ja	short vbe_srs_7 ; 23/01/2021
  8778                              <1> 			; invalid sub function
  8779 00003BD6 83F90F              <1> 	cmp	ecx, 0Fh
  8780 00003BD9 7752                <1> 	ja	short vbe_srs_7 ; invalid !
  8781                              <1> 	
  8782 00003BDB 20D2                <1> 	and	dl, dl
  8783 00003BDD 7515                <1> 	jnz	short vbe_srs_4
  8784                              <1> 
  8785                              <1> 	; DL = 0
  8786                              <1> 	; Return Save/Restore State buffer size
  8787                              <1> 
  8788                              <1> 	;mov	ebx, ecx
  8789                              <1> 	;shl	bl, 1
  8790                              <1> 	;mov	bx, [ebx+vbestatebufsize]
  8791 00003BDF E881000000          <1> 	call	vbe_srs_gbs
  8792                              <1> 
  8793                              <1> ;	; 11/01/2021
  8794                              <1> ;	test	cl, 8
  8795                              <1> ;	jz	short vbe_srs_3
  8796                              <1> ;	; vbe_biosfn_read_video_state_size();
  8797                              <1> ;	; return 9 * 2;
  8798                              <1> ;	mov	bl, 18 ; register state size
  8799                              <1> ;vbe_srs_0:
  8800                              <1> ;	test	cl, 1
  8801                              <1> ;	jz	short vbe_srs_1
  8802                              <1> ;	; size += 0x46;
  8803                              <1> ;	add	bl, 70	; controller state size
  8804                              <1> ;vbe_srs_1:
  8805                              <1> ;	test	cl, 2
  8806                              <1> ;	jz	short vbe_srs_2
  8807                              <1> ;	; size += (5 + 8 + 5) * 2 + 6;
  8808                              <1> ;	;add	bl, 42 ; BIOS data state size ; Bochs/Plex86
  8809                              <1> ;	; 12/01/2021
  8810                              <1> ;	add	bl, 40 ; TRDOS 386 v2 VBIOS data state size
  8811                              <1> ;vbe_srs_2:
  8812                              <1> ;	test	cl, 4
  8813                              <1> ;	jz	short vbe_srs_3
  8814                              <1> ;	; size += 3 + 256 * 3 + 1;
  8815                              <1> ;	add	bx, 772 ; DAC state size
  8816                              <1> 
  8817                              <1> vbe_srs_3:
  8818 00003BE4 6683C33F            <1> 	add	bx, 63
  8819 00003BE8 66C1EB06            <1> 	shr	bx, 6 ; / 64
  8820                              <1> 
  8821                              <1> vbe_srs_retn:
  8822 00003BEC 31C0                <1> 	xor	eax, eax ; 0
  8823                              <1> vbe_srs_0:  ; 16/01/2021
  8824 00003BEE B04F                <1> 	mov	al, 4Fh ; ax = 004Fh (successful)
  8825                              <1> ;vbe_srs_0:
  8826                              <1> 	; 13/01/2021
  8827 00003BF0 59                  <1> 	pop	ecx
  8828 00003BF1 5A                  <1> 	pop	edx
  8829 00003BF2 5F                  <1> 	pop	edi	
  8830                              <1> 
  8831 00003BF3 C3                  <1> 	retn
  8832                              <1> 
  8833                              <1> 	; 23/01/2021
  8834                              <1> ;vbe_srs_10:
  8835                              <1> 	;; 14/01/2021
  8836                              <1> 	; return to 'sysvideo'
  8837                              <1> 	;mov	ebx, ecx ; transfer count
  8838                              <1> 	;	; (byte count for saving current video state)
  8839                              <1> 	;jmp	short vbe_srs_retn 
  8840                              <1> 
  8841                              <1> vbe_srs_4:
  8842                              <1> 	; 23/01/2021
  8843 00003BF4 80E10F              <1> 	and	cl, 0Fh ; 8, 4, 2, 1
  8844 00003BF7 7434                <1> 	jz	short vbe_srs_7 ; cx = 0 -> invalid !
  8845                              <1> 
  8846 00003BF9 BF00760900          <1> 	mov	edi, VBE3SAVERESTOREBLOCK
  8847                              <1> 
  8848 00003BFE 80FA01              <1> 	cmp	dl, 1
  8849 00003C01 7730                <1> 	ja	short vbe_srs_8
  8850                              <1> 
  8851                              <1> 	; save video state
  8852                              <1> 
  8853 00003C03 F6C107              <1> 	test	cl, 07h ; 4, 2, 1
  8854 00003C06 740A                <1> 	jz	short vbe_srs_5  ; vbe dispi regs state
  8855                              <1> 
  8856 00003C08 E884000000          <1> 	call	biosfn_save_video_state
  8857                              <1> 	; edi = current position
  8858                              <1> 	;	in VBE3SAVERESTOREBLOCK
  8859                              <1> 	; 	(VGA save_state offset)
  8860                              <1> 	; modified regs: edi, eax, edx, ch
  8861 00003C0D F6C108              <1> 	test	cl, 8
  8862 00003C10 7405                <1> 	jz	short vbe_srs_6
  8863                              <1> vbe_srs_5:
  8864 00003C12 E8AC010000          <1> 	call	vbe_biosfn_save_video_state
  8865                              <1> 	; edi = end position
  8866                              <1> 	;	in VBE3SAVERESTOREBLOCK
  8867                              <1> 	; 	(VGA save_state offset)
  8868                              <1> 	; modified regs: edi, eax, edx, ch
  8869                              <1> vbe_srs_6:
  8870                              <1> 	; 23/01/2021
  8871 00003C17 21DB                <1> 	and	ebx, ebx 
  8872 00003C19 74D1                <1> 	jz	short vbe_srs_retn ; the caller is kernel
  8873                              <1> 	
  8874 00003C1B BE00760900          <1> 	mov	esi, VBE3SAVERESTOREBLOCK
  8875 00003C20 29F7                <1> 	sub	edi, esi
  8876 00003C22 89F9                <1> 	mov	ecx, edi ; transfer count in bytes
  8877                              <1> 
  8878                              <1> 	;; 14/01/2021
  8879                              <1> 	;and	ebx, ebx 
  8880                              <1> 	;jz	short vbe_srs_10 ; the caller is kernel
  8881                              <1> 
  8882 00003C24 89DF                <1> 	mov	edi, ebx ; user's buffer address
  8883 00003C26 E899D60000          <1> 	call	transfer_to_user_buffer
  8884 00003C2B 73BF                <1> 	jnc	short vbe_srs_retn
  8885                              <1> vbe_srs_7:
  8886                              <1> 	; // function failed
  8887                              <1> 	;mov	eax, 0100h
  8888 00003C2D 31C0                <1> 	xor	eax, eax
  8889 00003C2F FEC4                <1> 	inc	ah  ; eax = 0100h
  8890                              <1> 	; 16/01/2021
  8891                              <1> 	; ax = 0014Fh
  8892                              <1> 	;retn
  8893                              <1> 	; 13/01/2021
  8894 00003C31 EBBB                <1> 	jmp	short vbe_srs_0
  8895                              <1> vbe_srs_8:
  8896                              <1> 	;cmp	dl, 2
  8897                              <1> 	;jne	short vbe_srs_7
  8898                              <1> 	;		; invalid sub function
  8899                              <1> 
  8900                              <1> 	; 14/01/2021
  8901 00003C33 09DB                <1> 	or	ebx, ebx ; user's buffer address
  8902                              <1> 	;jnz	short vbe_srs_11
  8903                              <1> 
  8904                              <1> 	; the caller is kernel ('sysvideo')
  8905                              <1> 	;jmp	short vbe_srs_12
  8906                              <1> 	; 23/01/2021
  8907 00003C35 7414                <1> 	jz	short vbe_srs_12 ; 'sysvideo' call
  8908                              <1> vbe_srs_11:
  8909 00003C37 89DE                <1> 	mov	esi, ebx ; user's buffer address
  8910                              <1> 	; 23/01/2021
  8911                              <1> 	;push	ebx
  8912                              <1> 	
  8913 00003C39 E827000000          <1> 	call	vbe_srs_gbs
  8914                              <1> 	
  8915                              <1> 	; restore video state
  8916                              <1> 
  8917                              <1> 	;mov	edi, VBE3SAVERESTOREBLOCK
  8918 00003C3E 51                  <1> 	push	ecx
  8919 00003C3F 89D9                <1> 	mov	ecx, ebx ; transfer count in bytes
  8920 00003C41 E8C8D60000          <1> 	call	transfer_from_user_buffer
  8921 00003C46 59                  <1> 	pop	ecx
  8922                              <1> 	; 23/01/2021
  8923                              <1> 	;pop	ebx
  8924 00003C47 89F3                <1> 	mov	ebx, esi
  8925 00003C49 72E2                <1> 	jc	short vbe_srs_7
  8926                              <1> 
  8927                              <1> vbe_srs_12:
  8928                              <1> 	;mov	esi, VBE3SAVERESTOREBLOCK
  8929 00003C4B 89FE                <1> 	mov	esi, edi
  8930                              <1> 
  8931 00003C4D F6C107              <1> 	test	cl, 07h ; 4, 2, 1
  8932 00003C50 740C                <1> 	jz	short vbe_srs_9	; vbe dispi regs state
  8933                              <1> 
  8934 00003C52 E8A8010000          <1> 	call	biosfn_restore_video_state
  8935 00003C57 72D4                <1> 	jc	short vbe_srs_7 ; invalid buffer content !
  8936                              <1> 	; esi = current position
  8937                              <1> 	;	in VBE3SAVERESTOREBLOCK
  8938                              <1> 	; 	(VGA save_state offset)
  8939                              <1> 	; modified regs: esi, eax, edx, ch
  8940 00003C59 F6C108              <1> 	test	cl, 8
  8941                              <1> 	;jz	short vbe_srs_10
  8942                              <1> 	; 23/01/2020
  8943 00003C5C EB8E                <1> 	jmp	short vbe_srs_retn
  8944                              <1> vbe_srs_9:
  8945 00003C5E E8F8020000          <1> 	call	vbe_biosfn_restore_video_state
  8946                              <1> 
  8947                              <1> 	; modified regs: esi, eax, edx, ch
  8948                              <1> 
  8949 00003C63 EB87                <1> 	jmp	short vbe_srs_retn
  8950                              <1> 
  8951                              <1> ;vbe_srs_10:
  8952                              <1> ;	; successful
  8953                              <1> ;	xor	eax, eax ; 0
  8954                              <1> ;	mov	al, 4Fh ; ax = 004Fh (successful)
  8955                              <1> ;	retn
  8956                              <1> 
  8957                              <1> vbe_srs_gbs:
  8958                              <1> 	; return buffer size according to flags
  8959 00003C65 89CB                <1> 	mov	ebx, ecx ; options/flags
  8960 00003C67 D0E3                <1> 	shl	bl, 1
  8961 00003C69 668B9B[713C0000]    <1> 	mov	bx, [ebx+vbestatebufsize]
  8962 00003C70 C3                  <1> 	retn
  8963                              <1> 
  8964                              <1> vbestatebufsize:
  8965                              <1> 	; ----------------------------------------
  8966                              <1> 	; CL =	0  1   2    3    4    5    6    7
  8967                              <1> 	; ----------------------------------------
  8968 00003C71 0000460028006E0004- <1> 	dw	0, 70, 40, 110, 772, 842, 812, 882
  8968 00003C7A 034A032C037203      <1>
  8969                              <1> 	; ----------------------------------------
  8970                              <1> 	; CL =	8   9   10  11   12   13   14   15
  8971                              <1> 	; ----------------------------------------
  8972 00003C81 120058003A00800016- <1> 	dw	18, 88, 58, 128, 790, 860, 830, 900
  8972 00003C8A 035C033E038403      <1>
  8973                              <1> 
  8974                              <1> ; 11/01/2021
  8975                              <1> VGAREG_ACTL_ADDRESS	equ 3C0h
  8976                              <1> VGAREG_ACTL_WRITE_DATA	equ 3C0h
  8977                              <1> VGAREG_ACTL_READ_DATA	equ 3C1h
  8978                              <1> 
  8979                              <1> VGAREG_INPUT_STATUS	equ 3C2h
  8980                              <1> VGAREG_WRITE_MISC_OUTPUT equ 3C2h
  8981                              <1> VGAREG_VIDEO_ENABLE	equ 3C3h
  8982                              <1> VGAREG_SEQU_ADDRESS	equ 3C4h
  8983                              <1> VGAREG_SEQU_DATA	equ 3C5h
  8984                              <1> 
  8985                              <1> VGAREG_PEL_MASK		equ 3C6h
  8986                              <1> VGAREG_DAC_STATE	equ 3C7h
  8987                              <1> VGAREG_DAC_READ_ADDRESS	equ 3C7h
  8988                              <1> VGAREG_DAC_WRITE_ADDRESS equ 3C8h
  8989                              <1> VGAREG_DAC_DATA		equ 3C9h
  8990                              <1> 
  8991                              <1> VGAREG_READ_FEATURE_CTL	equ 3CAh
  8992                              <1> VGAREG_READ_MISC_OUTPUT	equ 3CCh
  8993                              <1> 
  8994                              <1> VGAREG_GRDC_ADDRESS	equ 3CEh
  8995                              <1> VGAREG_GRDC_DATA	equ 3CFh
  8996                              <1> 
  8997                              <1> ;VGAREG_MDA_CRTC_ADDRESS equ 3B4h
  8998                              <1> ;VGAREG_MDA_CRTC_DATA	equ 3B5h
  8999                              <1> VGAREG_VGA_CRTC_ADDRESS	equ 3D4h
  9000                              <1> VGAREG_VGA_CRTC_DATA	equ 3D5h
  9001                              <1> 
  9002                              <1> ;VGAREG_MDA_WRITE_FEATURE_CTL equ 3BAh
  9003                              <1> VGAREG_VGA_WRITE_FEATURE_CTL equ 3DAh
  9004                              <1> VGAREG_ACTL_RESET	equ 3DAh
  9005                              <1> 
  9006                              <1> ;VGAREG_MDA_MODECTL	equ 3B8h
  9007                              <1> VGAREG_CGA_MODECTL	equ 3D8h
  9008                              <1> VGAREG_CGA_PALETTE	equ 3D9h
  9009                              <1> 
  9010                              <1> biosfn_save_video_state:
  9011                              <1> 	; 22/01/2021
  9012                              <1> 	; 12/01/2021
  9013                              <1> 	; 11/01/2021 (TRDOS 386 v2.0.3)
  9014                              <1> 	; (vgabios.c)
  9015                              <1> 
  9016                              <1> 	; modified registers: eax, edx, edi, ch
  9017                              <1> 
  9018                              <1> 	;mov	edi, VBE3SAVERESTOREBLOCK
  9019                              <1> 
  9020                              <1> 	; input: edi = state buffer address
  9021                              <1> 
  9022 00003C91 F6C101              <1> 	test	cl, 1
  9023 00003C94 0F8485000000        <1> 	jz	bfn_svs_4
  9024                              <1> 
  9025 00003C9A 66BAC403            <1> 	mov	dx, VGAREG_SEQU_ADDRESS ; 3C7h
  9026 00003C9E EC                  <1> 	in	al, dx
  9027 00003C9F AA                  <1> 	stosb
  9028                              <1> 	;mov	dx, VGAREG_VGA_CRTC_ADDRESS ; 3D4h
  9029 00003CA0 B2D4                <1> 	mov	dl, 0D4h
  9030 00003CA2 EC                  <1> 	in	al, dx
  9031 00003CA3 AA                  <1> 	stosb
  9032                              <1>   	;mov	dx, VGAREG_GRDC_ADDRESS ; 3CEh 
  9033 00003CA4 B2CE                <1>         mov	dl, 0CEh
  9034 00003CA6 EC                  <1> 	in	al, dx
  9035 00003CA7 AA                  <1> 	stosb
  9036                              <1> 	;mov	dx, VGAREG_ACTL_RESET ; 3DAh
  9037 00003CA8 B2DA                <1> 	mov	dl, 0DAh
  9038 00003CAA EC                  <1> 	in	al, dx
  9039                              <1> 	;mov	dx, VGAREG_ACTL_ADDRESS ; 3C0h
  9040 00003CAB B2C0                <1> 	mov	dl, 0C0h
  9041 00003CAD EC                  <1> 	in	al, dx
  9042 00003CAE AA                  <1> 	stosb
  9043 00003CAF 88C4                <1> 	mov	ah, al ; ar_index
  9044                              <1> 	;mov	dx, VGAREG_READ_FEATURE_CTL ; 3CAh
  9045 00003CB1 B2CA                <1> 	mov	dl, 0CAh
  9046 00003CB3 EC                  <1> 	in	al, dx
  9047 00003CB4 AA                  <1> 	stosb
  9048                              <1> 	; (5 bytes are writen above)
  9049                              <1> 
  9050                              <1> 	; for(i=1;i<=4;i++){
  9051 00003CB5 B001                <1> 	mov	al, 1
  9052                              <1> 	;;mov	dx, VGAREG_SEQU_ADDRESS ; 3C4h
  9053                              <1> 	;mov	dl, 0C4h
  9054 00003CB7 B504                <1> 	mov	ch, 4
  9055                              <1> bfn_svs_0:
  9056                              <1> 	; outb(VGAREG_SEQU_ADDRESS, i);
  9057                              <1> 	;mov	dx, VGAREG_SEQU_ADDRESS ; 3C4h
  9058 00003CB9 B2C4                <1> 	mov	dl, 0C4h
  9059 00003CBB EE                  <1> 	out	dx, al
  9060                              <1> 	;mov	dx, VGAREG_SEQU_DATA  ; 3C5h
  9061 00003CBC FEC2                <1> 	inc	dl  ; dx = 3C5h
  9062                              <1> 	; inb(VGAREG_SEQU_DATA)
  9063 00003CBE 50                  <1> 	push	eax
  9064 00003CBF EC                  <1> 	in	al, dx
  9065 00003CC0 AA                  <1> 	stosb	; (4 bytes in loop)
  9066 00003CC1 58                  <1> 	pop	eax
  9067                              <1> 	;mov	dx, VGAREG_SEQU_ADDRESS ; 3C4h
  9068                              <1> 	;dec	dl	
  9069 00003CC2 FEC0                <1> 	inc	al  ; i++
  9070 00003CC4 FECD                <1> 	dec	ch
  9071 00003CC6 75F1                <1> 	jnz	short bfn_svs_0
  9072                              <1> 
  9073                              <1> 	; outb(VGAREG_SEQU_ADDRESS, 0);
  9074 00003CC8 28C0                <1> 	sub	al, al ; 0
  9075 00003CCA EE                  <1> 	out	dx, al
  9076                              <1> 	; inb(VGAREG_SEQU_DATA)
  9077                              <1> 	;mov	dx, VGAREG_SEQU_DATA ; 3C5h
  9078 00003CCB FEC2                <1> 	inc	dl  ; dx = 3C5h
  9079 00003CCD EC                  <1> 	in	al, dx
  9080 00003CCE AA                  <1> 	stosb	; (+1 byte)
  9081                              <1> 
  9082                              <1>         ; for(i=0;i<=0x18;i++) {
  9083 00003CCF 28C0                <1> 	sub	al, al ; 0
  9084                              <1> 	;;mov	dx, VGAREG_VGA_CRTC_ADDRESS ; 3D4h
  9085                              <1> 	;mov	dl, 0D4h
  9086 00003CD1 B519                <1> 	mov	ch, 25
  9087                              <1> bfn_svs_1:
  9088                              <1>         ; outb(crtc_addr,i);
  9089                              <1> 	;mov	dx, VGAREG_VGA_CRTC_ADDRESS ; 3D4h
  9090 00003CD3 B2D4                <1> 	mov	dl, 0D4h
  9091 00003CD5 EE                  <1> 	out	dx, al
  9092                              <1> 	;mov	dx, VGAREG_VGA_CRTC_DATA ; 3D5h
  9093 00003CD6 FEC2                <1> 	inc	dl  ; dx = 3D5h
  9094                              <1> 	; inb(crtc_addr+1)
  9095 00003CD8 50                  <1> 	push	eax
  9096 00003CD9 EC                  <1> 	in	al, dx
  9097 00003CDA AA                  <1> 	stosb	; (25 bytes in loop)
  9098 00003CDB 58                  <1> 	pop	eax
  9099                              <1> 	;mov	dx, VGAREG_VGA_CRTC_ADDRESS ; 3D4h
  9100                              <1> 	;dec	dl	
  9101 00003CDC FEC0                <1> 	inc	al  ; i++
  9102 00003CDE FECD                <1> 	dec	ch
  9103 00003CE0 75F1                <1> 	jnz	short bfn_svs_1
  9104                              <1> 
  9105 00003CE2 80E420              <1> 	and	ah, 20h  ; (ar_index & 0x20)
  9106                              <1>         ; for(i=0;i<=0x13;i++) {
  9107 00003CE5 28C0                <1> 	sub	al, al ; 0
  9108 00003CE7 B514                <1> 	mov	ch, 20
  9109                              <1> bfn_svs_2:
  9110                              <1> 	; inb(VGAREG_ACTL_RESET);
  9111                              <1> 	;mov	dx, VGAREG_ACTL_RESET ; 3DAh
  9112 00003CE9 B2DA                <1> 	mov	dl, 0DAh
  9113 00003CEB 50                  <1> 	push	eax
  9114 00003CEC EC                  <1> 	in	al, dx
  9115 00003CED 8A0424              <1> 	mov	al, [esp]
  9116                              <1>  	; outb(VGAREG_ACTL_ADDRESS, i | (ar_index & 0x20));
  9117 00003CF0 08E0                <1> 	or	al, ah
  9118                              <1> 	;mov	dx, VGAREG_ACTL_ADDRESS ; 3C0h
  9119 00003CF2 B2C0                <1> 	mov	dl, 0C0h
  9120 00003CF4 EE                  <1> 	out	dx, al
  9121                              <1> 	;mov	dx, VGAREG_ACTL_READ_DATA ; 3C1h
  9122                              <1> 	;mov	dl, 0C1h
  9123 00003CF5 FEC2                <1> 	inc	dl
  9124 00003CF7 EC                  <1> 	in	al, dx
  9125 00003CF8 AA                  <1> 	stosb	; (20 bytes in loop)
  9126 00003CF9 58                  <1> 	pop	eax
  9127 00003CFA FEC0                <1> 	inc	al  ; i++
  9128 00003CFC FECD                <1> 	dec	ch
  9129 00003CFE 75E9                <1> 	jnz	short bfn_svs_2
  9130                              <1> 
  9131                              <1> 	; inb(VGAREG_ACTL_RESET);
  9132                              <1> 	;mov	dx, VGAREG_ACTL_RESET ; 3DAh
  9133 00003D00 B2DA                <1> 	mov	dl, 0DAh
  9134 00003D02 EC                  <1> 	in	al, dx
  9135                              <1> 
  9136                              <1>         ; for(i=0;i<=8;i++) {
  9137 00003D03 28C0                <1> 	sub	al, al ; 0
  9138                              <1> 	;;mov	dx, VGAREG_GRDC_ADDRESS ; 3CEh
  9139                              <1> 	;mov	dl, 0CEh
  9140 00003D05 B509                <1> 	mov	ch, 9
  9141                              <1> bfn_svs_3:
  9142                              <1> 	; outb(VGAREG_GRDC_ADDRESS,i)
  9143                              <1> 	;mov	dx, VGAREG_GRDC_ADDRESS ; 3CEh
  9144 00003D07 B2CE                <1> 	mov	dl, 0CEh
  9145 00003D09 EE                  <1> 	out	dx, al
  9146                              <1> 	; inb(VGAREG_ACTL_READ_DATA)
  9147 00003D0A 50                  <1> 	push	eax
  9148                              <1> 	;mov	dx, VGAREG_GRDC_DATA ; 3CFh
  9149                              <1> 	;mov	dl, 0CFh
  9150 00003D0B FEC2                <1> 	inc	dl
  9151 00003D0D EC                  <1> 	in	al, dx
  9152 00003D0E AA                  <1> 	stosb	; (9 bytes in loop)
  9153 00003D0F 58                  <1> 	pop	eax
  9154                              <1> 	;dec	dl
  9155 00003D10 FEC0                <1> 	inc	al  ; i++
  9156 00003D12 FECD                <1> 	dec	ch
  9157 00003D14 75F1                <1> 	jnz	short bfn_svs_3
  9158                              <1> 
  9159                              <1> 	; write_word(ES, BX, crtc_addr); BX+= 2;
  9160                              <1> 	; (offset 64)
  9161 00003D16 66B8D403            <1> 	mov	ax, 3D4h ; VGAREG_VGA_CRTC_ADDRESS
  9162 00003D1A 66AB                <1> 	stosw	; (2 bytes (1 word))
  9163                              <1> 
  9164                              <1>         ; /* XXX: read plane latches */
  9165 00003D1C 31C0                <1> 	xor	eax, eax  ; 0
  9166 00003D1E AB                  <1>        	stosd	; (4 bytes)
  9167                              <1> 
  9168                              <1> 	; (total 70 bytes are written above as controller hardware state)
  9169                              <1> 
  9170                              <1> bfn_svs_4:		
  9171                              <1> 	; 12/01/2021 (TRDOS 386 v2.0.3)
  9172 00003D1F F6C102              <1> 	test	cl, 2
  9173 00003D22 7476                <1> 	jz	short bfn_svs_6
  9174                              <1> 
  9175                              <1> 	; VIDEO BIOS DATA
  9176                              <1> 	; !!! this data is valid for TRDOS 386 v2 kernel only !!!
  9177                              <1> 	; (this is not same with BOCHS/PLEX86 video bios, BIOS data)  
  9178                              <1>   
  9179                              <1>     	; if (CX & 2) {
  9180                              <1>         ;write_byte(ES, BX, read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE)); BX++;
  9181                              <1>         ;write_word(ES, BX, read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS)); BX += 2;
  9182                              <1>         ;write_word(ES, BX, read_word(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE)); BX += 2;
  9183                              <1>         ;write_word(ES, BX, read_word(BIOSMEM_SEG,BIOSMEM_CRTC_ADDRESS)); BX += 2;
  9184                              <1>         ;write_byte(ES, BX, read_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS)); BX++;
  9185                              <1>         ;write_word(ES, BX, read_word(BIOSMEM_SEG,BIOSMEM_CHAR_HEIGHT)); BX += 2;
  9186                              <1>         ;write_byte(ES, BX, read_byte(BIOSMEM_SEG,BIOSMEM_VIDEO_CTL)); BX++;
  9187                              <1>         ;write_byte(ES, BX, read_byte(BIOSMEM_SEG,BIOSMEM_SWITCHES)); BX++;
  9188                              <1>         ;write_byte(ES, BX, read_byte(BIOSMEM_SEG,BIOSMEM_MODESET_CTL)); BX++;
  9189                              <1>         ;write_word(ES, BX, read_word(BIOSMEM_SEG,BIOSMEM_CURSOR_TYPE)); BX += 2;
  9190                              <1>         ;for(i=0;i<8;i++) {
  9191                              <1>         ;   write_word(ES, BX, read_word(BIOSMEM_SEG, BIOSMEM_CURSOR_POS+2*i));
  9192                              <1>         ;   BX += 2;
  9193                              <1>         ;}
  9194                              <1>         ;write_word(ES, BX, read_word(BIOSMEM_SEG,BIOSMEM_CURRENT_START)); BX += 2;
  9195                              <1>         ;write_byte(ES, BX, read_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_PAGE)); BX++;
  9196                              <1>         ;/* current font */
  9197                              <1>         ;write_word(ES, BX, read_word(0, 0x1f * 4)); BX += 2;
  9198                              <1>         ;write_word(ES, BX, read_word(0, 0x1f * 4 + 2)); BX += 2;
  9199                              <1>         ;write_word(ES, BX, read_word(0, 0x43 * 4)); BX += 2;
  9200                              <1>         ;write_word(ES, BX, read_word(0, 0x43 * 4 + 2)); BX += 2;
  9201                              <1> 
  9202                              <1> 	; !!! save TRDOS 386 v2 kernel spesific video bios data !!!
  9203                              <1> 	; (which is/are used by 'SET_MODE' function and/or it's sub functions)
  9204                              <1> 
  9205 00003D24 66B8D403            <1> 	mov	ax, 3D4h ; CRTC_ADDR, always 3D4h (color VGA) for TRDOS 386 v2
  9206 00003D28 66AB                <1> 	stosw
  9207 00003D2A A0[BA6F0000]        <1> 	mov	al, [CRT_MODE] ; Current video mode (0FFh for VESA VBE modes) 
  9208 00003D2F AA                  <1> 	stosb
  9209 00003D30 A0[BB6F0000]        <1> 	mov	al, [CRT_MODE_SET] ; 29h for mode 03h ; TRDOS 386 feature only !
  9210 00003D35 AA                  <1> 	stosb	
  9211 00003D36 66A1[1E120300]      <1>  	mov	ax, [video_mode] ; Current VESA VBE (SVGA, extended VGA) mode 
  9212 00003D3C 66AB                <1> 	stosw			 ; (valid if [CRT_MODE] = 0FFh)	
  9213 00003D3E 66A1[288E0100]      <1> 	mov	ax, [CRT_LEN] ; page size (in bytes)
  9214 00003D44 66AB                <1> 	stosw
  9215 00003D46 66A1[AC810100]      <1> 	mov	ax, [CRT_START] ; video page start offset
  9216 00003D4C 66AB                <1>  	stosw
  9217 00003D4E A0[BC6F0000]        <1> 	mov	al, [CRT_COLS] ; nbcols, characters per row	
  9218 00003D53 AA                  <1> 	stosb
  9219 00003D54 A0[C26F0000]        <1> 	mov	al, [VGA_ROWS] ; nbrows, (character) rows per page (not rows-1)
  9220 00003D59 AA                  <1> 	stosb
  9221 00003D5A A0[BE6F0000]        <1> 	mov	al, [CHAR_HEIGHT] ; character font height (8 or 16 or 14)
  9222 00003D5F AA                  <1> 	stosb
  9223 00003D60 A0[BF6F0000]        <1> 	mov	al, [VGA_VIDEO_CTL] ; ROM BIOS DATA AREA Offset 87h
  9224 00003D65 AA                  <1> 	stosb
  9225 00003D66 A0[C06F0000]        <1> 	mov	al, [VGA_SWITCHES] ; feature bit switches
  9226 00003D6B AA                  <1> 	stosb
  9227 00003D6C A0[C16F0000]        <1> 	mov	al, [VGA_MODESET_CTL] ; basic mode set options
  9228 00003D71 AA                  <1> 	stosb
  9229                              <1> 	; followings are only used by TRDOS 386 v2 (IBM PC/AT ROMBIOS) code 
  9230                              <1> 	; (bochs/plex86 does not use and return those)
  9231 00003D72 A0[BD6F0000]        <1> 	mov	al, [CRT_PALETTE] ; current color palette ; TRDOS 386 feature only !
  9232 00003D77 AA                  <1> 	stosb
  9233 00003D78 A0[BE810100]        <1> 	mov	al, [ACTIVE_PAGE] ; current video page 
  9234 00003D7D AA                  <1> 	stosb
  9235 00003D7E 66A1[D36F0000]      <1> 	mov	ax, [CURSOR_MODE] ; cursor type
  9236 00003D84 66AB                <1> 	stosw
  9237                              <1> 	;mov	eax, [CURSOR_POSN] ; cursor position for video page 0 and 1 
  9238                              <1> 	;stosd
  9239                              <1> 	;mov	eax, [CURSOR_POSN+4] ; cursor position for video page 2 and 3 
  9240                              <1> 	;stosd
  9241                              <1> 	;mov	eax, [CURSOR_POSN+8] ; cursor position for video page 4 and 5 
  9242                              <1> 	;stosd
  9243                              <1> 	;mov	eax, [CURSOR_POSN+12] ; cursor position for video page 6 and 7 
  9244                              <1> 	;stosd
  9245 00003D86 56                  <1> 	push	esi
  9246 00003D87 B504                <1> 	mov	ch, 4
  9247 00003D89 BE[AE810100]        <1> 	mov	esi, CURSOR_POSN
  9248                              <1> bfn_svs_5:
  9249 00003D8E A5                  <1> 	movsd
  9250 00003D8F FECD                <1> 	dec	ch
  9251 00003D91 75FB                <1> 	jnz	short bfn_svs_5
  9252 00003D93 5E                  <1> 	pop	esi
  9253                              <1> 	; (font addr) protected mode address in kernel's/system memory space 
  9254                              <1> 	; (not accessable/meaningful address value by user)
  9255 00003D94 A1[3A8E0100]        <1> 	mov	eax, [VGA_INT43H] ; VGA current (default) font address
  9256 00003D99 AB                  <1> 	stosd
  9257                              <1> 	
  9258                              <1> 	; (total 40 bytes are written above as BIOS data state)
  9259                              <1> 
  9260                              <1> bfn_svs_6:
  9261                              <1> 	; 12/01/2021
  9262 00003D9A F6C104              <1> 	test	cl, 4
  9263 00003D9D 7423                <1> 	jz	short bfn_svs_8
  9264                              <1> 
  9265                              <1>   	;/* XXX: check this */
  9266                              <1> 		; /* read/write mode dac */
  9267                              <1>         ;write_byte(ES, BX, inb(VGAREG_DAC_STATE)); BX++;
  9268                              <1> 	;	; /* pix address */
  9269                              <1>         ;write_byte(ES, BX, inb(VGAREG_DAC_WRITE_ADDRESS)); BX++;
  9270                              <1>         ;write_byte(ES, BX, inb(VGAREG_PEL_MASK)); BX++;
  9271                              <1>         ;// Set the whole dac always, from 0
  9272                              <1>         ;outb(VGAREG_DAC_WRITE_ADDRESS,0x00);
  9273                              <1>         ;for(i=0;i<256*3;i++) {
  9274                              <1>         ;   write_byte(ES, BX, inb(VGAREG_DAC_DATA)); BX++;
  9275                              <1>         ;}
  9276                              <1>         ;write_byte(ES, BX, 0); BX++; /* color select register */
  9277                              <1> 
  9278                              <1> 	; /* read/write mode dac */
  9279 00003D9F 66BAC703            <1>     	mov	dx, 3C7h ; VGAREG_DAC_STATE
  9280 00003DA3 EC                  <1> 	in	al, dx
  9281 00003DA4 AA                  <1> 	stosb
  9282                              <1> 	; /* pix address */
  9283                              <1>     	;mov	dx, VGAREG_DAC_WRITE_ADDRESS ; 3C8h
  9284                              <1> 	;mov	dl, 0C8h
  9285 00003DA5 FEC2                <1> 	inc	dl
  9286 00003DA7 EC                  <1> 	in	al, dx
  9287 00003DA8 AA                  <1> 	stosb
  9288                              <1>     	;mov	dx, VGAREG_PEL_MASK  ; 3C6h
  9289 00003DA9 B2C6                <1> 	mov	dl, 0C6h
  9290 00003DAB EC                  <1> 	in	al, dx
  9291 00003DAC AA                  <1> 	stosb
  9292                              <1> 	;// Set the whole dac always, from 0
  9293 00003DAD 30C0                <1> 	xor	al, al ; 0
  9294                              <1> 	;mov	dx, VGAREG_DAC_WRITE_ADDRESS ; 3C8h
  9295 00003DAF B2C8                <1> 	mov	dl, 0C8h
  9296 00003DB1 EE                  <1> 	out	dx, al
  9297                              <1> 
  9298 00003DB2 51                  <1> 	push	ecx ; 22/01/2021
  9299                              <1> 	;for(i=0;i<256*3;i++) {
  9300 00003DB3 B900030000          <1> 	mov	ecx, 256*3 ; 768 bytes
  9301                              <1> 	;mov	dx, VGAREG_DAC_DATA ; 3C9h
  9302                              <1> 	;mov	dl, 0C9h
  9303 00003DB8 FEC2                <1> 	inc	dl ; dx = 3C9h
  9304                              <1> bfn_svs_7:
  9305 00003DBA EC                  <1> 	in	al, dx
  9306 00003DBB AA                  <1> 	stosb
  9307 00003DBC E2FC                <1> 	loop	bfn_svs_7
  9308 00003DBE 59                  <1> 	pop	ecx ; 22/01/2021
  9309                              <1> 
  9310                              <1> 	; /* color select register */
  9311 00003DBF 28C0                <1> 	sub	al, al ; 0
  9312 00003DC1 AA                  <1> 	stosb
  9313                              <1> 
  9314                              <1> 	; (total 772 bytes are written above as DAC state)
  9315                              <1> bfn_svs_8:
  9316 00003DC2 C3                  <1> 	retn
  9317                              <1> 
  9318                              <1> vbe_biosfn_save_video_state:
  9319                              <1> 	; 23/01/2021
  9320                              <1> 	; 13/01/2021
  9321                              <1> 	; 12/01/2021 (TRDOS 386 v2.0.3)
  9322                              <1> 	; (vbe.c)
  9323                              <1> 
  9324                              <1> 	; modified registers: eax, edx, edi, ch
  9325                              <1> 	
  9326                              <1> 	; input: edi = state buffer address
  9327                              <1> 	; output: 
  9328                              <1> 	;	 VBE DISPI register contents will be saved
  9329                              <1> 	;	 (18 bytes, 9 words)
  9330                              <1> 
  9331                              <1> 	; outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ENABLE);
  9332                              <1> 	; enable = inw(VBE_DISPI_IOPORT_DATA);
  9333                              <1>   	; write_word(ES, BX, enable);
  9334                              <1>  	; BX += 2;
  9335                              <1> 	; if (!(enable & VBE_DISPI_ENABLED)) 
  9336                              <1> 	;	return;
  9337                              <1> 	; for(i = VBE_DISPI_INDEX_XRES;
  9338                              <1> 	;		 i <= VBE_DISPI_INDEX_Y_OFFSET; i++) {
  9339                              <1> 	;    if (i != VBE_DISPI_INDEX_ENABLE) {
  9340                              <1> 	;        outw(VBE_DISPI_IOPORT_INDEX, i);
  9341                              <1> 	;        write_word(ES, BX, inw(VBE_DISPI_IOPORT_DATA));
  9342                              <1>         ;    BX += 2;
  9343                              <1> 	;        }
  9344                              <1> 	; }
  9345                              <1> 
  9346 00003DC3 66BACE01            <1> 	mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
  9347 00003DC7 B804000000          <1> 	mov	eax, 04h  ; VBE_DISPI_INDEX_ENABLE
  9348 00003DCC 66EF                <1> 	out	dx, ax
  9349                              <1> 	;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA	
  9350 00003DCE FEC2                <1> 	inc	dl
  9351 00003DD0 66ED                <1> 	in	ax, dx ; enable (status)
  9352 00003DD2 66AB                <1> 	stosw 
  9353 00003DD4 6683E001            <1> 	and	ax, 1 ; VBE_DISPI_ENABLED
  9354 00003DD8 7505                <1> 	jnz	short vbe_bfn_svs_0
  9355                              <1> 	; 23/01/2021
  9356                              <1> 	; ax = 0
  9357                              <1> 	; VBE_DISPI_DISABLED
  9358                              <1> 	; 13/01/2021
  9359                              <1> 	; clear remain 8 bytes 
  9360                              <1> 	;xor	eax, eax
  9361 00003DDA AB                  <1> 	stosd	; 2
  9362 00003DDB AB                  <1> 	stosd	; 2
  9363 00003DDC AB                  <1> 	stosd	; 2
  9364 00003DDD AB                  <1> 	stosd	; 2
  9365 00003DDE C3                  <1> 	retn
  9366                              <1> vbe_bfn_svs_0:
  9367                              <1> 	; VBE_DISPI_ENABLED
  9368                              <1> 
  9369                              <1> 	;sub	eax, eax
  9370 00003DDF 28C0                <1> 	sub	al, al ; eax = 0
  9371                              <1> 	
  9372                              <1> 	; from VBE_DISPI_INDEX_XRES
  9373                              <1> 	;   to VBE_DISPI_INDEX_BPP	
  9374                              <1> 
  9375 00003DE1 B503                <1>  	mov	ch, 3
  9376                              <1> 	; al = 0 ; VBE_DISPI_INDEX_XRES - 1
  9377                              <1> 
  9378 00003DE3 E804000000          <1> 	call	vbe_bfn_svs_1
  9379                              <1> 
  9380                              <1> 	; from VBE_DISPI_INDEX_BANK
  9381                              <1> 	;   to VBE_DISPI_INDEX_Y_OFFSET
  9382                              <1> 
  9383 00003DE8 FEC0                <1> 	inc	al 
  9384                              <1> 	; al = 4 ; VBE_DISPI_INDEX_BANK - 1
  9385                              <1> 
  9386 00003DEA B505                <1> 	mov	ch, 5
  9387                              <1> vbe_bfn_svs_1:
  9388 00003DEC FEC0                <1> 	inc	al ; from VBE_DISPI_INDEX_XRES
  9389                              <1> 		   ;   to VBE_DISPI_INDEX_BPP	
  9390                              <1> 	;mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
  9391 00003DEE FECA                <1> 	dec	dl ; 1CEh
  9392 00003DF0 66EF                <1> 	out	dx, ax
  9393 00003DF2 50                  <1> 	push	eax
  9394                              <1> 	;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA
  9395 00003DF3 FEC2                <1> 	inc	dl ; 1CFh
  9396 00003DF5 66ED                <1> 	in	ax, dx
  9397 00003DF7 66AB                <1> 	stosw
  9398 00003DF9 58                  <1> 	pop	eax
  9399 00003DFA FECD                <1> 	dec	ch
  9400 00003DFC 75EE                <1> 	jnz	short vbe_bfn_svs_1		
  9401 00003DFE C3                  <1> 	retn
  9402                              <1> 
  9403                              <1> ; 11/01/2021
  9404                              <1> VGAREG_ACTL_ADDRESS	equ 3C0h
  9405                              <1> VGAREG_ACTL_WRITE_DATA	equ 3C0h
  9406                              <1> VGAREG_ACTL_READ_DATA	equ 3C1h
  9407                              <1> 
  9408                              <1> VGAREG_INPUT_STATUS	equ 3C2h
  9409                              <1> VGAREG_WRITE_MISC_OUTPUT equ 3C2h
  9410                              <1> VGAREG_VIDEO_ENABLE	equ 3C3h
  9411                              <1> VGAREG_SEQU_ADDRESS	equ 3C4h
  9412                              <1> VGAREG_SEQU_DATA	equ 3C5h
  9413                              <1> 
  9414                              <1> VGAREG_PEL_MASK		equ 3C6h
  9415                              <1> VGAREG_DAC_STATE	equ 3C7h
  9416                              <1> VGAREG_DAC_READ_ADDRESS	equ 3C7h
  9417                              <1> VGAREG_DAC_WRITE_ADDRESS equ 3C8h
  9418                              <1> VGAREG_DAC_DATA		equ 3C9h
  9419                              <1> 
  9420                              <1> VGAREG_READ_FEATURE_CTL	equ 3CAh
  9421                              <1> VGAREG_READ_MISC_OUTPUT	equ 3CCh
  9422                              <1> 
  9423                              <1> VGAREG_GRDC_ADDRESS	equ 3CEh
  9424                              <1> VGAREG_GRDC_DATA	equ 3CFh
  9425                              <1> 
  9426                              <1> ;VGAREG_MDA_CRTC_ADDRESS equ 3B4h
  9427                              <1> ;VGAREG_MDA_CRTC_DATA	equ 3B5h
  9428                              <1> VGAREG_VGA_CRTC_ADDRESS	equ 3D4h
  9429                              <1> VGAREG_VGA_CRTC_DATA	equ 3D5h
  9430                              <1> 
  9431                              <1> ;VGAREG_MDA_WRITE_FEATURE_CTL equ 3BAh
  9432                              <1> VGAREG_VGA_WRITE_FEATURE_CTL equ 3DAh
  9433                              <1> VGAREG_ACTL_RESET	equ 3DAh
  9434                              <1> 
  9435                              <1> ;VGAREG_MDA_MODECTL	equ 3B8h
  9436                              <1> VGAREG_CGA_MODECTL	equ 3D8h
  9437                              <1> VGAREG_CGA_PALETTE	equ 3D9h
  9438                              <1> 
  9439                              <1> biosfn_restore_video_state:
  9440                              <1> 	; 22/01/2021
  9441                              <1> 	; 13/01/2021
  9442                              <1> 	; 12/01/2021 (TRDOS 386 v2.0.3)
  9443                              <1> 	; (vgabios.c)
  9444                              <1> 
  9445                              <1> 	; modified registers: eax, edx, esi, edi, ch
  9446                              <1> 
  9447                              <1> 	;mov	esi, VBE3SAVERESTOREBLOCK
  9448                              <1> 
  9449                              <1> 	; input: esi = state buffer address
  9450                              <1> 
  9451 00003DFF F6C101              <1> 	test	cl, 1
  9452 00003E02 0F84A9000000        <1> 	jz	bfn_rvs_6
  9453                              <1> 
  9454 00003E08 66817E40D403        <1> 	cmp	word [esi+64], 3D4h ; must be 3D4h
  9455 00003E0E 7402                <1> 	je	short bfn_rvs_0  
  9456                              <1> 			; it is seen as valid buffer
  9457 00003E10 F9                  <1> 	stc
  9458 00003E11 C3                  <1> 	retn
  9459                              <1> 
  9460                              <1> bfn_rvs_0:
  9461 00003E12 89F7                <1> 	mov	edi, esi ; addr1
  9462 00003E14 83C605              <1> 	add	esi, 5 ; skip 1st 5 bytes for now
  9463                              <1> 
  9464                              <1> 	; // Reset Attribute Ctl flip-flop
  9465                              <1>         ; inb(VGAREG_ACTL_RESET);
  9466 00003E17 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  9467 00003E1B EC                  <1> 	in	al, dx
  9468                              <1> 
  9469                              <1> 	; for(i=1;i<=4;i++){
  9470 00003E1C B001                <1> 	mov	al, 1
  9471                              <1> 	;;mov	dx, VGAREG_SEQU_ADDRESS ; 3C4h
  9472                              <1> 	;mov	dl, 0C4h
  9473 00003E1E B504                <1> 	mov	ch, 4
  9474                              <1> bfn_rvs_1:
  9475                              <1> 	; outb(VGAREG_SEQU_ADDRESS, i);
  9476                              <1> 	;mov	dx, VGAREG_SEQU_ADDRESS ; 3C4h
  9477 00003E20 B2C4                <1> 	mov	dl, 0C4h
  9478 00003E22 EE                  <1> 	out	dx, al
  9479                              <1> 	;mov	dx, VGAREG_SEQU_DATA  ; 3C5h
  9480 00003E23 FEC2                <1> 	inc	dl  ; dx = 3C5h
  9481                              <1> 	; outb(VGAREG_SEQU_DATA)
  9482 00003E25 50                  <1> 	push	eax
  9483 00003E26 AC                  <1> 	lodsb	; (4 bytes in loop)
  9484 00003E27 EE                  <1> 	out	dx, al
  9485 00003E28 58                  <1> 	pop	eax
  9486                              <1> 	;mov	dx, VGAREG_SEQU_ADDRESS ; 3C4h
  9487                              <1> 	;dec	dl	
  9488 00003E29 FEC0                <1> 	inc	al  ; i++
  9489 00003E2B FECD                <1> 	dec	ch
  9490 00003E2D 75F1                <1> 	jnz	short bfn_rvs_1
  9491                              <1> 
  9492                              <1> 	; outb(VGAREG_SEQU_ADDRESS, 0);
  9493 00003E2F 28C0                <1> 	sub	al, al ; 0
  9494 00003E31 EE                  <1> 	out	dx, al
  9495                              <1> 	; outb(VGAREG_SEQU_DATA)
  9496                              <1> 	;mov	dx, VGAREG_SEQU_DATA ; 3C5h
  9497 00003E32 FEC2                <1> 	inc	dl  ; dx = 3C5h
  9498 00003E34 AC                  <1> 	lodsb	; (+1 byte)
  9499 00003E35 EE                  <1> 	out	dx, al
  9500                              <1> 
  9501                              <1> 	; // Disable CRTC write protection
  9502                              <1> 	; outw(crtc_addr,0x0011);
  9503                              <1> 	;mov	dx, VGAREG_VGA_CRTC_ADDRESS ; 3D4h
  9504 00003E36 B2D4                <1> 	mov	dl, 0D4h
  9505 00003E38 66B81100            <1> 	mov	ax, 11h
  9506 00003E3C 66EF                <1> 	out	dx, ax
  9507                              <1> 
  9508                              <1> 	; // Set CRTC regs
  9509                              <1>        
  9510                              <1> 	; for(i=0;i<=0x18;i++) {
  9511                              <1>         ;   if (i != 0x11) {
  9512 00003E3E 28C0                <1> 	sub	al, al ; 0
  9513                              <1> 	;;mov	dx, VGAREG_VGA_CRTC_ADDRESS ; 3D4h
  9514                              <1> 	;mov	dl, 0D4h
  9515 00003E40 B519                <1> 	mov	ch, 25
  9516                              <1> bfn_rvs_2:
  9517                              <1>         ; outb(crtc_addr,i);
  9518                              <1> 	;mov	dx, VGAREG_VGA_CRTC_ADDRESS ; 3D4h
  9519 00003E42 B2D4                <1> 	mov	dl, 0D4h
  9520 00003E44 EE                  <1> 	out	dx, al
  9521                              <1> 	;mov	dx, VGAREG_VGA_CRTC_DATA ; 3D5h
  9522 00003E45 FEC2                <1> 	inc	dl  ; dx = 3D5h
  9523                              <1> 	; inb(crtc_addr+1)
  9524 00003E47 50                  <1> 	push	eax
  9525 00003E48 AC                  <1> 	lodsb	; (25 bytes in loop)
  9526 00003E49 EE                  <1> 	out	dx, al
  9527 00003E4A 58                  <1> 	pop	eax
  9528                              <1> 	;mov	dx, VGAREG_VGA_CRTC_ADDRESS ; 3D4h
  9529                              <1> 	;dec	dl
  9530 00003E4B FEC0                <1> 	inc	al  ; i++
  9531 00003E4D 3C11                <1> 	cmp	al, 17 ; 11h
  9532 00003E4F 7505                <1> 	jne	short bfn_rvs_3
  9533 00003E51 AC                  <1> 	lodsb
  9534 00003E52 88C4                <1> 	mov	ah, al ; *
  9535 00003E54 B012                <1> 	mov	al, 18 
  9536                              <1> bfn_rvs_3:
  9537 00003E56 FECD                <1> 	dec	ch
  9538 00003E58 75E8                <1> 	jnz	short bfn_rvs_2
  9539                              <1> 
  9540                              <1> 	; // select crtc base address
  9541                              <1>         ; v = inb(VGAREG_READ_MISC_OUTPUT) & ~0x01;
  9542                              <1> 	;if (crtc_addr = 0x3d4)
  9543                              <1> 	;   v |= 0x01;
  9544                              <1> 	; outb(VGAREG_WRITE_MISC_OUTPUT, v);
  9545                              <1> 
  9546                              <1> 	;;mov	dx, VGAREG_READ_MISC_OUTPUT ; 3CCh
  9547                              <1> 	;mov	dl, 0CCh
  9548                              <1> 	;in	al, dl
  9549                              <1> 	;and	al, 1
  9550                              <1> 	;;mov	dx, VGAREG_WRITE_MISC_OUTPUT ; 3C2h
  9551                              <1> 	;mov	dl, 0C2h
  9552                              <1> 	;or	al, 1
  9553                              <1> 	;out	dx, al
  9554                              <1> 
  9555                              <1> 	; // enable write protection if needed
  9556                              <1> 	;outb(crtc_addr, 0x11);
  9557                              <1>         ;outb(crtc_addr+1, read_byte(ES, BX - 0x18 + 0x11));
  9558                              <1> 	;mov	dx, VGAREG_VGA_CRTC_ADDRESS ; 3D4h
  9559 00003E5A B2D4                <1> 	mov	dl, 0D4h
  9560 00003E5C B011                <1> 	mov	al, 11h
  9561 00003E5E EE                  <1> 	out	dx, al
  9562 00003E5F 88E0                <1> 	mov	al, ah ; *
  9563 00003E61 FEC2                <1> 	inc	dl ; dx = 3D5h
  9564 00003E63 EE                  <1> 	out	dx, al
  9565                              <1> 
  9566                              <1> 	; // Set Attribute Ctl
  9567 00003E64 8A6703              <1> 	mov	ah, [edi+3] ; addr1+3, ah = ar_index
  9568 00003E67 80E420              <1> 	and	ah, 20h  ; (ar_index & 0x20)
  9569                              <1> 
  9570                              <1>         ; inb(VGAREG_ACTL_RESET);
  9571                              <1> 	;mov	dx, 3DAh ; VGAREG_ACTL_RESET
  9572 00003E6A B2DA                <1> 	mov	dl, 0DAh
  9573 00003E6C EC                  <1> 	in	al, dx
  9574                              <1> 
  9575                              <1>         ; for(i=0;i<=0x13;i++) {
  9576 00003E6D 28C0                <1> 	sub	al, al ; 0
  9577 00003E6F B514                <1> 	mov	ch, 20
  9578                              <1> bfn_rvs_4:
  9579                              <1>  	; outb(VGAREG_ACTL_ADDRESS, i | (ar_index & 0x20));
  9580 00003E71 50                  <1> 	push	eax
  9581 00003E72 08E0                <1> 	or	al, ah
  9582                              <1> 	;mov	dx, VGAREG_ACTL_ADDRESS ; 3C0h
  9583 00003E74 B2C0                <1> 	mov	dl, 0C0h
  9584 00003E76 EE                  <1> 	out	dx, al
  9585                              <1> 	;mov	dx, VGAREG_ACTL_WRITE_DATA ; 3C0h
  9586                              <1> 	;mov	dl, 0C0h
  9587 00003E77 AC                  <1> 	lodsb	; (20 bytes in loop)
  9588 00003E78 EE                  <1> 	out	dx, al
  9589 00003E79 58                  <1> 	pop	eax
  9590 00003E7A FEC0                <1> 	inc	al  ; i++
  9591 00003E7C FECD                <1> 	dec	ch
  9592 00003E7E 75F1                <1> 	jnz	short bfn_rvs_4
  9593                              <1> 
  9594                              <1> 	; outb(VGAREG_ACTL_ADDRESS, ar_index);
  9595                              <1> 	;mov	dx, VGAREG_ACTL_ADDRESS ; 3C0h
  9596                              <1> 	;mov	dl, 0C0h
  9597 00003E80 88E0                <1> 	mov	al, ah ; ar_index
  9598 00003E82 EE                  <1> 	out	dx, al
  9599                              <1> 
  9600                              <1> 	; inb(VGAREG_ACTL_RESET);
  9601                              <1> 	;mov	dx, VGAREG_ACTL_RESET ; 3DAh
  9602 00003E83 B2DA                <1> 	mov	dl, 0DAh
  9603 00003E85 EC                  <1> 	in	al, dx
  9604                              <1> 
  9605                              <1>         ; for(i=0;i<=8;i++) {
  9606 00003E86 28C0                <1> 	sub	al, al ; 0
  9607                              <1> 	;;mov	dx, VGAREG_GRDC_ADDRESS ; 3CEh
  9608                              <1> 	;mov	dl, 0CEh
  9609 00003E88 B509                <1> 	mov	ch, 9
  9610                              <1> bfn_rvs_5:
  9611                              <1> 	; outb(VGAREG_GRDC_ADDRESS,i)
  9612                              <1> 	;mov	dx, VGAREG_GRDC_ADDRESS ; 3CEh
  9613 00003E8A B2CE                <1> 	mov	dl, 0CEh
  9614 00003E8C EE                  <1> 	out	dx, al
  9615                              <1> 	; outb(VGAREG_ACTL_READ_DATA)
  9616 00003E8D 50                  <1> 	push	eax
  9617                              <1> 	;mov	dx, VGAREG_GRDC_DATA ; 3CFh
  9618                              <1> 	;mov	dl, 0CFh
  9619 00003E8E FEC2                <1> 	inc	dl
  9620 00003E90 AC                  <1> 	lodsb	; (9 bytes in loop)
  9621 00003E91 EE                  <1> 	out	dx, al
  9622 00003E92 58                  <1> 	pop	eax
  9623                              <1> 	;dec	dl
  9624 00003E93 FEC0                <1> 	inc	al  ; i++
  9625 00003E95 FECD                <1> 	dec	ch
  9626 00003E97 75F1                <1> 	jnz	short bfn_rvs_5
  9627                              <1> 
  9628                              <1> 	; BX += 2; /* crtc_addr */     ; 3D4h
  9629                              <1>         ; BX += 4; /* plane latches */ ; 0
  9630 00003E99 83C606              <1> 	add	esi, 6	      
  9631 00003E9C 56                  <1> 	push	esi ; *	
  9632                              <1> 
  9633                              <1> 	;outb(VGAREG_SEQU_ADDRESS, read_byte(ES, addr1)); addr1++;
  9634                              <1>         ;outb(crtc_addr, read_byte(ES, addr1)); addr1++;
  9635                              <1>         ;outb(VGAREG_GRDC_ADDRESS, read_byte(ES, addr1)); addr1++;
  9636                              <1>         ;addr1++;
  9637                              <1>         ;outb(crtc_addr - 0x4 + 0xa, read_byte(ES, addr1)); addr1++;
  9638                              <1> 
  9639 00003E9D 89FE                <1> 	mov	esi, edi ; start of state buffer
  9640                              <1> 
  9641                              <1> 	;mov	dx, VGAREG_SEQU_ADDRESS ; 3C7h
  9642 00003E9F B2C7                <1> 	mov	dl, 0C7h 
  9643 00003EA1 AC                  <1> 	lodsb
  9644 00003EA2 EE                  <1> 	out	dx, al
  9645                              <1> 	;mov	dx, VGAREG_VGA_CRTC_ADDRESS ; 3D4h
  9646 00003EA3 B2D4                <1> 	mov	dl, 0D4h
  9647 00003EA5 AC                  <1> 	lodsb
  9648 00003EA6 EE                  <1> 	out	dx, al
  9649                              <1> 	;mov	dx, VGAREG_GRDC_ADDRESS ; 3CEh 
  9650 00003EA7 B2CE                <1>         mov	dl, 0CEh
  9651 00003EA9 AC                  <1> 	lodsb
  9652 00003EAA EE                  <1> 	out	dx, al
  9653 00003EAB AC                  <1> 	lodsb	; addr1++
  9654                              <1> 	;mov	dx, VGAREG_VGA_WRITE_FEATURE_CTL ; 3DAh
  9655 00003EAC B2DA                <1> 	mov	dl, 0DAh
  9656 00003EAE AC                  <1> 	lodsb
  9657 00003EAF EE                  <1> 	out	dx, al
  9658                              <1> 
  9659 00003EB0 5E                  <1> 	pop	esi ; *
  9660                              <1> 
  9661                              <1> 	; (total 70 bytes are read above as controller hardware state)
  9662                              <1> 
  9663                              <1> bfn_rvs_6:		
  9664                              <1> 	; 13/01/2021
  9665 00003EB1 F6C102              <1> 	test	cl, 2
  9666 00003EB4 747D                <1> 	jz	short bfn_rvs_9
  9667                              <1> 
  9668                              <1> 	; VIDEO BIOS DATA
  9669                              <1> 	; !!! this data is valid for TRDOS 386 v2 kernel only !!!
  9670                              <1> 	; (this is not same with BOCHS/PLEX86 video bios, BIOS data)  
  9671                              <1>   
  9672                              <1>     	; if (CX & 2) {
  9673                              <1> 	;write_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_MODE, read_byte(ES, BX)); BX++;
  9674                              <1>         ;write_word(BIOSMEM_SEG,BIOSMEM_NB_COLS, read_word(ES, BX)); BX += 2;
  9675                              <1>         ;write_word(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE, read_word(ES, BX)); BX += 2;
  9676                              <1>         ;write_word(BIOSMEM_SEG,BIOSMEM_CRTC_ADDRESS, read_word(ES, BX)); BX += 2;
  9677                              <1>         ;write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, read_byte(ES, BX)); BX++;
  9678                              <1>         ;write_word(BIOSMEM_SEG,BIOSMEM_CHAR_HEIGHT, read_word(ES, BX)); BX += 2;
  9679                              <1>         ;write_byte(BIOSMEM_SEG,BIOSMEM_VIDEO_CTL, read_byte(ES, BX)); BX++;
  9680                              <1>         ;write_byte(BIOSMEM_SEG,BIOSMEM_SWITCHES, read_byte(ES, BX)); BX++;
  9681                              <1>         ;write_byte(BIOSMEM_SEG,BIOSMEM_MODESET_CTL, read_byte(ES, BX)); BX++;
  9682                              <1>         ;write_word(BIOSMEM_SEG,BIOSMEM_CURSOR_TYPE, read_word(ES, BX)); BX += 2;
  9683                              <1>         ;for(i=0;i<8;i++) {
  9684                              <1>         ;   write_word(BIOSMEM_SEG, BIOSMEM_CURSOR_POS+2*i, read_word(ES, BX));
  9685                              <1>         ;   BX += 2;
  9686                              <1>         ;}
  9687                              <1>         ;write_word(BIOSMEM_SEG,BIOSMEM_CURRENT_START, read_word(ES, BX)); BX += 2;
  9688                              <1>         ;write_byte(BIOSMEM_SEG,BIOSMEM_CURRENT_PAGE, read_byte(ES, BX)); BX++;
  9689                              <1>         ;/* current font */
  9690                              <1>         ;write_word(0, 0x1f * 4, read_word(ES, BX)); BX += 2;
  9691                              <1>         ;write_word(0, 0x1f * 4 + 2, read_word(ES, BX)); BX += 2;
  9692                              <1>         ;write_word(0, 0x43 * 4, read_word(ES, BX)); BX += 2;
  9693                              <1>         ;write_word(0, 0x43 * 4 + 2, read_word(ES, BX)); BX += 2;
  9694                              <1> 
  9695                              <1> 	; !!! save TRDOS 386 v2 kernel spesific video bios data !!!
  9696                              <1> 	; (which is/are used by 'SET_MODE' function and/or it's sub functions)
  9697                              <1> 
  9698 00003EB6 66AD                <1> 	lodsw	 ; CRTC_ADDR, always 3D4h (color VGA) for TRDOS 386 v2
  9699                              <1> 	; skip 3D4h check if it is already checked
  9700 00003EB8 F6C101              <1> 	test	cl, 1
  9701 00003EBB 7508                <1> 	jnz	short bfn_rvs_7
  9702 00003EBD 663DD403            <1> 	cmp	ax, 3D4h
  9703 00003EC1 7402                <1> 	je	short bfn_rvs_7
  9704 00003EC3 F9                  <1> 	stc
  9705 00003EC4 C3                  <1> 	retn
  9706                              <1> bfn_rvs_7:
  9707 00003EC5 AC                  <1> 	lodsb
  9708 00003EC6 A2[BA6F0000]        <1> 	mov	[CRT_MODE], al ; Current video mode (0FFh for VESA VBE modes) 
  9709 00003ECB AC                  <1> 	lodsb
  9710 00003ECC A2[BB6F0000]        <1> 	mov	[CRT_MODE_SET], al ; 29h for mode 03h ; TRDOS 386 feature only !
  9711 00003ED1 66AD                <1> 	lodsw	
  9712 00003ED3 66A3[1E120300]      <1>  	mov	[video_mode], ax ; Current VESA VBE (SVGA, extended VGA) mode 
  9713 00003ED9 66AD                <1> 	lodsw		 ; (valid if [CRT_MODE] = 0FFh)	
  9714 00003EDB 66A3[288E0100]      <1> 	mov	[CRT_LEN], ax ; page size (in bytes)
  9715 00003EE1 66AD                <1> 	lodsw
  9716 00003EE3 66A3[AC810100]      <1> 	mov	[CRT_START], ax ; video page start offset
  9717 00003EE9 AC                  <1>  	lodsb
  9718 00003EEA A2[BC6F0000]        <1> 	mov	[CRT_COLS], al ; nbcols, characters per row	
  9719 00003EEF AC                  <1> 	lodsb
  9720 00003EF0 A2[C26F0000]        <1> 	mov	[VGA_ROWS], al ; nbrows, (character) rows per page (not rows-1)
  9721 00003EF5 AC                  <1> 	lodsb
  9722 00003EF6 A2[BE6F0000]        <1> 	mov	[CHAR_HEIGHT], al ; character font height (8 or 16 or 14)
  9723 00003EFB AC                  <1> 	lodsb
  9724 00003EFC A2[BF6F0000]        <1> 	mov	[VGA_VIDEO_CTL], al ; ROM BIOS DATA AREA Offset 87h
  9725 00003F01 AC                  <1> 	lodsb
  9726 00003F02 A2[C06F0000]        <1> 	mov	[VGA_SWITCHES], al ; feature bit switches
  9727 00003F07 AC                  <1> 	lodsb
  9728 00003F08 A2[C16F0000]        <1> 	mov	[VGA_MODESET_CTL], al ; basic mode set options
  9729                              <1> 	; followings are only used by TRDOS 386 v2 (IBM PC/AT ROMBIOS) code 
  9730                              <1> 	; (bochs/plex86 does not use and return those)
  9731 00003F0D AC                  <1> 	lodsb
  9732 00003F0E A2[BD6F0000]        <1> 	mov	[CRT_PALETTE], al ; current color palette ; TRDOS 386 feature only !
  9733 00003F13 AC                  <1> 	lodsb
  9734 00003F14 A2[BE810100]        <1> 	mov	[ACTIVE_PAGE], al ; current video page 
  9735 00003F19 66AD                <1> 	lodsw
  9736 00003F1B 66A3[D36F0000]      <1> 	mov	[CURSOR_MODE], ax ; cursor type
  9737                              <1> 	;lodsd
  9738                              <1> 	;mov	[CURSOR_POSN], eax ; cursor position for video page 0 and 1 
  9739                              <1> 	;lodsd
  9740                              <1> 	;mov	[CURSOR_POSN+4], eax ; cursor position for video page 2 and 3 
  9741                              <1> 	;lodsd
  9742                              <1> 	;mov	[CURSOR_POSN+8], eax ; cursor position for video page 4 and 5 
  9743                              <1> 	;lodsd
  9744                              <1> 	;mov	[CURSOR_POSN+12], eax ; cursor position for video page 6 and 7 
  9745 00003F21 B504                <1> 	mov	ch, 4
  9746 00003F23 BF[AE810100]        <1> 	mov	edi, CURSOR_POSN
  9747                              <1> bfn_rvs_8:
  9748 00003F28 A5                  <1> 	movsd
  9749 00003F29 FECD                <1> 	dec	ch
  9750 00003F2B 75FB                <1> 	jnz	short bfn_rvs_8
  9751                              <1> 	; (font addr) protected mode address in kernel's/system memory space 
  9752                              <1> 	; (not accessable/meaningful address value by user)
  9753 00003F2D AD                  <1> 	lodsd
  9754 00003F2E A3[3A8E0100]        <1> 	mov	[VGA_INT43H], eax ; VGA current (default) font address
  9755                              <1> 
  9756                              <1> 	; (total 40 bytes are read&written above as BIOS data state)
  9757                              <1> bfn_rvs_9:
  9758                              <1> 	; 13/01/2021
  9759 00003F33 F6C104              <1> 	test	cl, 4
  9760 00003F36 7422                <1> 	jz	short bfn_rvs_11
  9761                              <1> 
  9762                              <1> 	;BX++;
  9763                              <1>         ;v = read_byte(ES, BX); BX++;
  9764                              <1>         ;outb(VGAREG_PEL_MASK, read_byte(ES, BX)); BX++;
  9765                              <1>         ;// Set the whole dac always, from 0
  9766                              <1>         ;outb(VGAREG_DAC_WRITE_ADDRESS,0x00);
  9767                              <1>         ;for(i=0;i<256*3;i++) {
  9768                              <1>         ;   outb(VGAREG_DAC_DATA, read_byte(ES, BX)); BX++;
  9769                              <1>         ;}
  9770                              <1>         ;BX++;
  9771                              <1>         ;outb(VGAREG_DAC_WRITE_ADDRESS, v);
  9772                              <1> 
  9773                              <1> 	; /* read/write mode dac */
  9774 00003F38 AC                  <1> 	lodsb	; skip ; VGAREG_DAC_STATE
  9775 00003F39 AC                  <1> 	lodsb
  9776 00003F3A 88C4                <1> 	mov	ah, al ; * ; v
  9777 00003F3C AC                  <1> 	lodsb
  9778 00003F3D 66BAC603            <1> 	mov	dx, VGAREG_PEL_MASK  ; 3C6h
  9779 00003F41 EE                  <1> 	out	dx, al
  9780                              <1> 	;// Set the whole dac always, from 0
  9781 00003F42 30C0                <1> 	xor	al, al ; 0
  9782                              <1> 	;mov	dx, VGAREG_DAC_WRITE_ADDRESS ; 3C8h
  9783 00003F44 B2C8                <1> 	mov	dl, 0C8h
  9784 00003F46 EE                  <1> 	out	dx, al
  9785                              <1> 
  9786 00003F47 51                  <1> 	push	ecx ; 22/01/2021
  9787                              <1> 	;for(i=0;i<256*3;i++) {
  9788 00003F48 B900030000          <1> 	mov	ecx, 256*3 ; 768 bytes
  9789                              <1> 	;mov	dx, VGAREG_DAC_DATA ; 3C9h
  9790                              <1> 	;mov	dl, 0C9h
  9791 00003F4D FEC2                <1> 	inc	dl ; dx = 3C9h
  9792                              <1> bfn_rvs_10:
  9793 00003F4F AC                  <1> 	lodsb
  9794 00003F50 EE                  <1> 	out	dx, al
  9795 00003F51 E2FC                <1> 	loop	bfn_rvs_10
  9796 00003F53 59                  <1> 	pop	ecx ; 22/01/2021
  9797                              <1> 
  9798                              <1> 	; /* color select register */
  9799 00003F54 AC                  <1> 	lodsb	 ; skip 
  9800                              <1> 	
  9801 00003F55 88E0                <1> 	mov	al, ah ; * ; v
  9802                              <1> 
  9803                              <1> 	;mov	dx, VGAREG_DAC_WRITE_ADDRESS ; 3C8h
  9804                              <1> 	;mov	dl, 0C8h
  9805 00003F57 FECA                <1> 	dec	dl ; dx  = 3C8h
  9806 00003F59 EE                  <1> 	out	dx, al ; * ; v
  9807                              <1> 	
  9808                              <1> 	; (total 772 bytes are read above as DAC state)
  9809                              <1> bfn_rvs_11:
  9810 00003F5A C3                  <1> 	retn
  9811                              <1> 
  9812                              <1> vbe_biosfn_restore_video_state:
  9813                              <1> 	; 23/01/2021
  9814                              <1> 	; 13/01/2021 (TRDOS 386 v2.0.3)
  9815                              <1> 	; (vbe.c)
  9816                              <1> 
  9817                              <1> 	; modified registers: eax, edx, esi, ch
  9818                              <1> 	
  9819                              <1> 	; input: esi = state buffer address
  9820                              <1> 	; output: 
  9821                              <1> 	;	 VBE DISPI register contents will be restored
  9822                              <1> 	;	 (18 bytes, 9 words)
  9823                              <1> 
  9824                              <1>  	; enable = read_word(ES, BX);
  9825                              <1> 	; BX += 2;
  9826                              <1> 	;
  9827                              <1> 	; if (!(enable & VBE_DISPI_ENABLED)) {
  9828                              <1>         ;   outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ENABLE);
  9829                              <1>         ;   outw(VBE_DISPI_IOPORT_DATA, enable);
  9830                              <1> 	; } else {
  9831                              <1>         ;   outw(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_XRES);
  9832                              <1>         ;   outw(VBE_DISPI_IOPORT_DATA, read_word(ES, BX));
  9833                              <1>         ;   BX += 2;
  9834                              <1>         ;   outw(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_YRES);
  9835                              <1>         ;   outw(VBE_DISPI_IOPORT_DATA, read_word(ES, BX));
  9836                              <1>         ;   BX += 2;
  9837                              <1>         ;   outw(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_BPP);
  9838                              <1>         ;   outw(VBE_DISPI_IOPORT_DATA, read_word(ES, BX));
  9839                              <1>         ;   BX += 2;
  9840                              <1>         ;   outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ENABLE);
  9841                              <1>         ;   outw(VBE_DISPI_IOPORT_DATA, enable);
  9842                              <1> 	;
  9843                              <1>         ;  for(i = VBE_DISPI_INDEX_BANK; i <= VBE_DISPI_INDEX_Y_OFFSET; i++)
  9844                              <1> 	;    {
  9845                              <1>         ;     outw(VBE_DISPI_IOPORT_INDEX, i);
  9846                              <1>         ;     outw(VBE_DISPI_IOPORT_DATA, read_word(ES, BX));
  9847                              <1>         ;     BX += 2;
  9848                              <1>         ;    }
  9849                              <1>         ; }
  9850                              <1> 
  9851 00003F5B 66AD                <1> 	lodsw	; enable (status, enabled=1, disabled=0)
  9852 00003F5D 66BACE01            <1> 	mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
  9853                              <1> 	; 23/01/2021
  9854 00003F61 6683E001            <1> 	and	ax, 1 ; VBE_DISPI_ENABLED
  9855 00003F65 750B                <1> 	jnz	short vbe_bfn_rvs_1
  9856                              <1> 	; ax = 0
  9857                              <1> 	; VBE_DISPI_DISABLED
  9858                              <1> vbe_bfn_rvs_0:
  9859                              <1> 	; enable (disable) dispi
  9860                              <1> 	; dx = 01CEh ; VBE_DISPI_IOPORT_INDEX
  9861                              <1> 	; ah = 0
  9862 00003F67 50                  <1> 	push	eax
  9863 00003F68 B004                <1> 	mov	al, 04h	; VBE_DISPI_INDEX_ENABLE
  9864 00003F6A 66EF                <1> 	out	dx, ax
  9865                              <1> 	;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA	
  9866 00003F6C FEC2                <1> 	inc	dl
  9867 00003F6E 58                  <1> 	pop	eax
  9868 00003F6F 66EF                <1> 	out	dx, ax ; enable (or disable)
  9869 00003F71 C3                  <1> 	retn
  9870                              <1> vbe_bfn_rvs_1:
  9871                              <1> 	; VBE_DISPI_ENABLED
  9872                              <1> 
  9873                              <1> 	; from VBE_DISPI_INDEX_XRES
  9874                              <1> 	;   to VBE_DISPI_INDEX_BPP	
  9875                              <1> 
  9876 00003F72 B503                <1>  	mov	ch, 3
  9877 00003F74 28C0                <1> 	sub	al, al ; 0 ; VBE_DISPI_INDEX_XRES - 1
  9878                              <1> 	; ax = 0
  9879                              <1> 
  9880 00003F76 E80B000000          <1> 	call	vbe_bfn_rvs_2
  9881                              <1> 
  9882                              <1>         ;outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ENABLE);
  9883                              <1> 	;outw(VBE_DISPI_IOPORT_DATA, enable);
  9884                              <1> 
  9885                              <1> 	; 23/01/2021
  9886 00003F7B B001                <1> 	mov	al, 1 ; VBE_DISPI_ENABLED
  9887                              <1> 	; ax = 1
  9888 00003F7D E8E5FFFFFF          <1> 	call	vbe_bfn_rvs_0
  9889                              <1> 
  9890                              <1> 	; from VBE_DISPI_INDEX_BANK
  9891                              <1> 	;   to VBE_DISPI_INDEX_Y_OFFSET
  9892                              <1> 
  9893 00003F82 B505                <1> 	mov	ch, 5
  9894                              <1> 	; 23/01/2021
  9895 00003F84 B004                <1> 	mov	al, 4  ; VBE_DISPI_INDEX_BANK - 1
  9896                              <1> 	; ax = 4
  9897                              <1> vbe_bfn_rvs_2:
  9898 00003F86 FEC0                <1> 	inc	al ; from VBE_DISPI_INDEX_XRES
  9899                              <1> 		     ; to VBE_DISPI_INDEX_BPP	
  9900                              <1> 	;mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
  9901                              <1> 	;mov	dl, 0CEh
  9902 00003F88 66EF                <1> 	out	dx, ax
  9903 00003F8A 50                  <1> 	push	eax
  9904                              <1> 	;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA
  9905 00003F8B FEC2                <1> 	inc	dl ; 1CFh
  9906 00003F8D 66AD                <1> 	lodsw
  9907 00003F8F 66EF                <1> 	out	dx, ax
  9908 00003F91 58                  <1> 	pop	eax
  9909 00003F92 FECA                <1> 	dec	dl ; 1CEh
  9910 00003F94 FECD                <1> 	dec	ch
  9911 00003F96 75EE                <1> 	jnz	short vbe_bfn_rvs_2		
  9912 00003F98 C3                  <1> 	retn
  9913                              <1> 
  9914                              <1> ; ---------------------------------------------------------
  9915                              <1>  
  9916                              <1> dispi_set_enable:
  9917                              <1> 	; 23/11/2020
  9918                              <1> 	; Input:
  9919                              <1> 	;	ax = VBE_DISPI_ENABLED = 1
  9920                              <1> 	;	     or VBE_DISPI_DISABLED = 0
  9921                              <1> 	;
  9922                              <1> 	; Modified registers: none
  9923                              <1> 	
  9924                              <1> 	;push	edx
  9925                              <1> 	;push	eax
  9926                              <1> 	;mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
  9927                              <1> 	;mov	ax, 04h	  ; VBE_DISPI_INDEX_ENABLE
  9928                              <1> 	;out	dx, ax
  9929                              <1> 	;pop	eax
  9930                              <1> 	;;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA
  9931                              <1> 	;;mov	dl, 0CFh
  9932                              <1> 	;inc	dl
  9933                              <1> 	;out	dx, ax
  9934                              <1> 	;pop	edx
  9935                              <1> 	;retn
  9936                              <1> 
  9937                              <1> 	; 25/11/2020
  9938                              <1> 	; Modified registers: edx
  9939                              <1> 	;push	edx
  9940 00003F99 66BA0400            <1> 	mov	dx, 04h ; VBE_DISPI_INDEX_ENABLE
  9941                              <1> 	;call	dispi_set_parms
  9942                              <1> 	;pop	edx
  9943                              <1> 	;retn
  9944                              <1> 	;;jmp	short dispi_set_parms
  9945                              <1> 
  9946                              <1> dispi_set_parms:
  9947                              <1> 	; 25/11/2020
  9948                              <1> 	; Input:
  9949                              <1> 	;	ax = data
  9950                              <1> 	;	dx = vbe dispi register index
  9951                              <1> 	;
  9952                              <1> 	; Modified registers: edx
  9953                              <1> 
  9954 00003F9D 50                  <1> 	push	eax
  9955 00003F9E 6689D0              <1> 	mov	ax, dx
  9956 00003FA1 66BACE01            <1> 	mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
  9957 00003FA5 66EF                <1> 	out	dx, ax
  9958 00003FA7 58                  <1> 	pop	eax
  9959                              <1> 	;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA
  9960                              <1> 	;mov	dl, 0CFh
  9961 00003FA8 FEC2                <1> 	inc	dl
  9962 00003FAA 66EF                <1> 	out	dx, ax
  9963 00003FAC C3                  <1> 	retn
  9964                              <1> 
  9965                              <1> dispi_set_bpp:
  9966                              <1> 	; 25/11/2020
  9967                              <1> 	; Input:
  9968                              <1> 	;	ax = Bits per pixel value
  9969                              <1> 	;	     (8,16,24,32)
  9970                              <1> 	;
  9971                              <1> 	; Modified registers: none
  9972                              <1> 
  9973                              <1> 	;push	edx
  9974                              <1> 	;push	eax
  9975                              <1> 	;mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
  9976                              <1> 	;mov	ax, 03h	  ; VBE_DISPI_INDEX_BPP
  9977                              <1> 	;out	dx, ax
  9978                              <1> 	;pop	eax
  9979                              <1> 	;;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA
  9980                              <1> 	;;mov	dl, 0CFh
  9981                              <1> 	;inc	dl
  9982                              <1> 	;out	dx, ax
  9983                              <1> 	;pop	edx
  9984                              <1> 	;retn
  9985                              <1> 
  9986                              <1> 	; 25/11/2020
  9987                              <1> 	; Modified registers: edx
  9988                              <1> 	;push	edx
  9989 00003FAD 66BA0300            <1> 	mov	dx, 03h ; VBE_DISPI_INDEX_BPP
  9990                              <1> 	;call	dispi_set_parms
  9991                              <1> 	;pop	edx
  9992                              <1> 	;retn
  9993 00003FB1 EBEA                <1> 	jmp	short dispi_set_parms
  9994                              <1> 
  9995                              <1> dispi_set_xres:
  9996                              <1> 	; 25/11/2020
  9997                              <1> 	; Input:
  9998                              <1> 	;	ax = X resolution (screen witdh)
  9999                              <1> 	;	     (320,640,800,1024,1280,1920)
 10000                              <1> 	;
 10001                              <1> 	; Modified registers: none
 10002                              <1> 
 10003                              <1> 	;push	edx
 10004                              <1> 	;push	eax
 10005                              <1> 	;mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
 10006                              <1> 	;mov	ax, 01h	  ; VBE_DISPI_INDEX_XRES
 10007                              <1> 	;out	dx, ax
 10008                              <1> 	;pop	eax
 10009                              <1> 	;;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA
 10010                              <1> 	;;mov	dl, 0CFh
 10011                              <1> 	;inc	dl
 10012                              <1> 	;out	dx, ax
 10013                              <1> 	;pop	edx
 10014                              <1> 	;retn
 10015                              <1> 
 10016                              <1> 	; 25/11/2020
 10017                              <1> 	; Modified registers: edx
 10018                              <1> 	;push	edx
 10019 00003FB3 66BA0100            <1> 	mov	dx, 01h ; VBE_DISPI_INDEX_XRES
 10020                              <1> 	;call	dispi_set_parms
 10021                              <1> 	;pop	edx
 10022                              <1> 	;retn
 10023 00003FB7 EBE4                <1> 	jmp	short dispi_set_parms
 10024                              <1> 
 10025                              <1> dispi_set_yres:
 10026                              <1> 	; 25/11/2020
 10027                              <1> 	; Input:
 10028                              <1> 	;	ax = Y resolution (screen height)
 10029                              <1> 	;	     (200,400,600,720,768,1080)
 10030                              <1> 	;
 10031                              <1> 	; Modified registers: none
 10032                              <1> 
 10033                              <1> 	;push	edx
 10034                              <1> 	;push	eax
 10035                              <1> 	;mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
 10036                              <1> 	;mov	ax, 02h	  ; VBE_DISPI_INDEX_YRES
 10037                              <1> 	;out	dx, ax
 10038                              <1> 	;pop	eax
 10039                              <1> 	;;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA
 10040                              <1> 	;;mov	dl, 0CFh
 10041                              <1> 	;inc	dl
 10042                              <1> 	;out	dx, ax
 10043                              <1> 	;pop	edx
 10044                              <1> 	;retn
 10045                              <1> 
 10046                              <1> 	; 25/11/2020
 10047                              <1> 	; Modified registers: edx
 10048                              <1> 	;push	edx
 10049 00003FB9 66BA0200            <1> 	mov	dx, 02h  ; VBE_DISPI_INDEX_YRES
 10050                              <1> 	;call	dispi_set_parms
 10051                              <1> 	;pop	edx
 10052                              <1> 	;retn
 10053 00003FBD EBDE                <1> 	jmp	short dispi_set_parms
 10054                              <1> 
 10055                              <1> dispi_set_bank:
 10056                              <1> 	; 25/11/2020
 10057                              <1> 	; Input:
 10058                              <1> 	;	ax = video memory bank number
 10059                              <1> 	;
 10060                              <1> 	; Modified registers: none
 10061                              <1> 
 10062                              <1> 	;push	edx
 10063                              <1> 	;push	eax
 10064                              <1> 	;mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
 10065                              <1> 	;mov	ax, 05h	  ; VBE_DISPI_INDEX_BANK
 10066                              <1> 	;out	dx, ax
 10067                              <1> 	;pop	eax
 10068                              <1> 	;;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA
 10069                              <1> 	;;mov	dl, 0CFh
 10070                              <1> 	;inc	dl
 10071                              <1> 	;out	dx, ax
 10072                              <1> 	;pop	edx
 10073                              <1> 	;retn
 10074                              <1> 	
 10075                              <1> 	; 25/11/2020
 10076                              <1> 	; Modified registers: edx
 10077                              <1> 	;push	edx
 10078 00003FBF 66BA0500            <1> 	mov	dx, 05h  ; VBE_DISPI_INDEX_BANK
 10079                              <1> 	;call	dispi_set_parms
 10080                              <1> 	;pop	edx
 10081                              <1> 	;retn
 10082 00003FC3 EBD8                <1> 	jmp	short dispi_set_parms
 10083                              <1> 
 10084                              <1> dispi_get_enable:
 10085                              <1> 	; 27/11/2020
 10086                              <1> 	; Input:
 10087                              <1> 	;	none
 10088                              <1> 	; Output:
 10089                              <1> 	;	ax = vbe dispi status
 10090                              <1> 	;
 10091                              <1> 	; Modified registers: eax
 10092                              <1> 	
 10093                              <1> 	;push	edx
 10094                              <1> 	;mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
 10095                              <1> 	;mov	ax, 04h	  ; VBE_DISPI_INDEX_ENABLE
 10096                              <1> 	;out	dx, ax
 10097                              <1> 	;;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA
 10098                              <1> 	;;mov	dl, 0CFh
 10099                              <1> 	;inc	dl
 10100                              <1> 	;in	ax, dx
 10101                              <1> 	;pop	edx
 10102                              <1> 	;retn
 10103                              <1> 
 10104                              <1> 	; 27/11/2020
 10105                              <1> 	; Modified registers: eax, edx
 10106                              <1> 	;push	edx
 10107 00003FC5 66B80400            <1> 	mov	ax, 04h ; VBE_DISPI_INDEX_ENABLE
 10108                              <1> 	;call	dispi_get_parms
 10109                              <1> 	;pop	edx
 10110                              <1> 	;retn
 10111                              <1> 	;;jmp	short dispi_get_parms
 10112                              <1> 
 10113                              <1> dispi_get_parms:
 10114                              <1> 	; 25/11/2020
 10115                              <1> 	; Input:
 10116                              <1> 	;	ax = vbe dispi register index
 10117                              <1> 	; output:
 10118                              <1> 	;	ax = data
 10119                              <1> 	;
 10120                              <1> 	; Modified registers: eax, edx
 10121                              <1> 
 10122 00003FC9 66BACE01            <1> 	mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
 10123 00003FCD 66EF                <1> 	out	dx, ax
 10124                              <1> 	;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA
 10125                              <1> 	;mov	dl, 0CFh
 10126 00003FCF FEC2                <1> 	inc	dl
 10127 00003FD1 66ED                <1> 	in	ax, dx
 10128 00003FD3 C3                  <1> 	retn
 10129                              <1> 
 10130                              <1> vga_compat_setup:
 10131                              <1> 	; 26/11/2020
 10132                              <1> 	; 25/11/2020
 10133                              <1> 	; VGA compatibility setup
 10134                              <1> 	; (vbe.c, 02/01/2020, vruppert)
 10135                              <1> 	;
 10136                              <1> 	; Input:
 10137                              <1> 	;	none
 10138                              <1> 	;
 10139                              <1> 	; Modified registers: eax, edx
 10140                              <1> 	
 10141                              <1> 	; 26/11/2020
 10142                              <1>   	;push	eax
 10143                              <1>   	;push	edx
 10144                              <1> 
 10145                              <1>   	; set CRT X resolution
 10146 00003FD4 66BACE01            <1>   	mov	dx, 1CEh ; VBE_DISPI_IOPORT_INDEX
 10147 00003FD8 66B80100            <1>   	mov	ax, 01h  ; VBE_DISPI_INDEX_XRES
 10148 00003FDC 66EF                <1>   	out	dx, ax
 10149                              <1>   	;mov	dx, 1CFh ; VBE_DISPI_IOPORT_DATA
 10150 00003FDE FEC2                <1>   	inc	dl
 10151 00003FE0 66ED                <1> 	in	ax, dx
 10152 00003FE2 50                  <1> 	push	eax
 10153 00003FE3 66BAD403            <1> 	mov	dx, 3D4h ; VGAREG_VGA_CRTC_ADDRESS
 10154 00003FE7 66B81100            <1>   	mov	ax, 0011h ; Vertical retrace end register
 10155 00003FEB 66EF                <1>   	out	dx, ax
 10156                              <1>   	;pop	eax
 10157                              <1>   	;push	eax
 10158 00003FED 8B0424              <1>   	mov	eax, [esp]
 10159 00003FF0 66C1E803            <1> 	shr	ax, 3 ; / 8 for pixel to character
 10160 00003FF4 6648                <1>   	dec	ax  ; - 1 (EGA or VGA?)
 10161 00003FF6 88C4                <1>   	mov	ah, al
 10162 00003FF8 B001                <1>   	mov	al, 01h ; Horizontal display end register
 10163 00003FFA 66EF                <1>   	out	dx, ax
 10164 00003FFC 58                  <1>   	pop	eax
 10165                              <1> 
 10166 00003FFD E8B0000000          <1> 	call	vga_set_virt_width
 10167                              <1> 
 10168                              <1>   	; set CRT Y resolution
 10169 00004002 66BACE01            <1>   	mov	dx, 1CEh ; VBE_DISPI_IOPORT_INDEX
 10170 00004006 66B80200            <1>   	mov	ax, 02h  ; VBE_DISPI_INDEX_YRES
 10171 0000400A 66EF                <1>   	out	dx, ax
 10172                              <1>   	;mov	dx, 1CFh ; VBE_DISPI_IOPORT_DATA
 10173 0000400C FEC2                <1>   	inc	dl
 10174 0000400E 66ED                <1> 	in	ax, dx
 10175 00004010 50                  <1> 	push	eax
 10176 00004011 66BAD403            <1> 	mov	dx, 3D4h ; VGAREG_VGA_CRTC_ADDRESS
 10177 00004015 88C4                <1>   	mov	ah, al
 10178 00004017 B012                <1> 	mov	al, 12h ; Vertical display end register
 10179 00004019 66EF                <1>   	out	dx, ax
 10180 0000401B 58                  <1>   	pop	eax
 10181 0000401C B007                <1>   	mov	al, 07h	; Overflow register
 10182 0000401E EE                  <1>   	out	dx, al
 10183 0000401F 6642                <1>   	inc	dx
 10184 00004021 EC                  <1>   	in	al, dx ; read overflow register
 10185 00004022 24BD                <1>   	and	al, 0BDh ; clear VDE 9th and 10th bits	
 10186 00004024 F6C401              <1>   	test	ah, 01h
 10187 00004027 7402                <1>   	jz	short bit8_clear
 10188 00004029 0C02                <1>   	or	al, 02h ; VDE 9th bit (bit 8) in bit 1
 10189                              <1> bit8_clear:
 10190 0000402B F6C402              <1>   	test	ah, 02h
 10191 0000402E 7402                <1>   	jz	short bit9_clear
 10192 00004030 0C40                <1>   	or	al, 40h ; VDE 10th bit (bit 9) in bit 6
 10193                              <1> bit9_clear:
 10194 00004032 EE                  <1>   	out	dx, al
 10195                              <1> 
 10196                              <1>   	; other settings
 10197 00004033 66BAD403            <1>  	mov	dx, 3D4h ; VGAREG_VGA_CRTC_ADDRESS
 10198 00004037 66B80900            <1>   	mov	ax, 0009h ; Maximum scan line register
 10199 0000403B 66EF                <1>   	out	dx, ax	; Reset
 10200 0000403D B017                <1>   	mov	al, 17h ; Mode control register		
 10201 0000403F EE                  <1>   	out	dx, al
 10202                              <1>  	;mov	dx, 3D5h ; VGAREG_VGA_CRTC_DATA
 10203 00004040 FEC2                <1>   	inc	dl
 10204 00004042 EC                  <1> 	in	al, dx	; Read mode control register
 10205 00004043 0C03                <1>   	or	al, 03h ; Set SRS and CMS bits
 10206 00004045 EE                  <1>   	out	dx, al 
 10207 00004046 66BADA03            <1>   	mov	dx, 3DAh ; VGAREG_ACTL_RESET
 10208 0000404A EC                  <1>   	in	al, dx	 ; clear flip-flop
 10209 0000404B 66BAC003            <1>   	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
 10210 0000404F B010                <1>   	mov	al, 10h	; Mode control register
 10211 00004051 EE                  <1>   	out	dx, al
 10212                              <1> 	;mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
 10213 00004052 FEC2                <1> 	inc	dl
 10214 00004054 EC                  <1> 	in	al, dx
 10215 00004055 0C01                <1> 	or	al, 01h ; select graphics mode
 10216                              <1> 	;mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
 10217 00004057 FECA                <1> 	dec	dl
 10218 00004059 EE                  <1> 	out	dx, al ; Write to mode control register
 10219 0000405A B020                <1> 	mov	al, 20h ; Palette RAM <-> display memory
 10220 0000405C EE                  <1> 	out	dx, al ; Write to attribute addr register
 10221 0000405D 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
 10222 00004061 66B80605            <1> 	mov	ax, 0506h ; Misc. register, graph, mm 1
 10223 00004065 66EF                <1> 	out	dx, ax
 10224 00004067 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
 10225 0000406B 66B8020F            <1> 	mov	ax, 0F02h ; Map mask register, all planes
 10226 0000406F 66EF                <1> 	out	dx, ax
 10227                              <1> 
 10228                              <1>   	; settings for >= 8bpp
 10229                              <1> 
 10230                              <1> 	;mov	dx, 1CEh ; VBE_DISPI_IOPORT_INDEX
 10231                              <1> 	;mov	ax, 03h ; VBE_DISPI_INDEX_BPP
 10232                              <1> 	;out	dx, ax
 10233                              <1> 	;;mov	dx, 1CFh ; VBE_DISPI_IOPORT_DATA
 10234                              <1> 	;inc	dl
 10235                              <1> 	;in	ax, dx
 10236                              <1> 	;cmp	al, 08h  ; < 8 bits per pixel
 10237                              <1> 	;jb	short vga_compat_end
 10238                              <1> 
 10239 00004071 66BAD403            <1> 	mov	dx, 3D4h ; VGAREG_VGA_CRTC_ADDRESS
 10240 00004075 B014                <1> 	mov	al, 14h  ; Underline location register
 10241 00004077 EE                  <1> 	out	dx, al
 10242                              <1> 	;mov	dx, 3D5h ; VGAREG_VGA_CRTC_DATA
 10243 00004078 FEC2                <1> 	inc	dl
 10244 0000407A EC                  <1> 	in	al, dx	
 10245 0000407B 0C40                <1> 	or	al, 40h	 ; enable double word mode
 10246 0000407D EE                  <1> 	out	dx, al
 10247 0000407E 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
 10248 00004082 EC                  <1> 	in	al, dx	 ; clear flip-flop
 10249 00004083 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
 10250 00004087 B010                <1> 	mov	al, 10h	 ; Mode control register
 10251 00004089 EE                  <1> 	out	dx, al
 10252                              <1> 	;mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
 10253 0000408A FEC2                <1> 	inc	dl
 10254 0000408C EC                  <1> 	in	al, dx
 10255 0000408D 0C40                <1> 	or	al, 40h  ; Pixel clock select is 1 	
 10256                              <1> 	;mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
 10257 0000408F FECA                <1> 	dec	dl
 10258 00004091 EE                  <1> 	out	dx, al	 ; update mode control reggister
 10259 00004092 B020                <1> 	mov	al, 20h	 ; select display memory as PAS	
 10260 00004094 EE                  <1> 	out	dx, al
 10261 00004095 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
 10262 00004099 B004                <1> 	mov	al, 04h	; Memory mode register
 10263 0000409B EE                  <1> 	out	dx, al
 10264                              <1> 	;mov	dx, 3C5h ; VGAREG_SEQU_DATA
 10265 0000409C FEC2                <1> 	inc	dl
 10266 0000409E EC                  <1> 	in	al, dx
 10267 0000409F 0C08                <1> 	or	al, 08h	; enable chain four
 10268 000040A1 EE                  <1> 	out	dx, al
 10269 000040A2 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
 10270 000040A6 B005                <1> 	mov	al, 05h	 ; Mode register	
 10271 000040A8 EE                  <1> 	out	dx, al
 10272                              <1> 	;mov	dx, 3CFh ; VGAREG_GRDC_DATA
 10273 000040A9 FEC2                <1> 	inc	dl
 10274 000040AB EC                  <1> 	in	al, dx	
 10275 000040AC 249F                <1> 	and	al, 9Fh	 ; clear shift register 
 10276 000040AE 0C40                <1> 	or	al, 40h  ; set shift register to 2
 10277 000040B0 EE                  <1> 	out	dx, al
 10278                              <1> 
 10279                              <1> vga_compat_end:
 10280                              <1>   	;pop	edx
 10281                              <1>   	;pop	eax
 10282 000040B1 C3                  <1> 	retn
 10283                              <1> 
 10284                              <1> vga_set_virt_width:
 10285                              <1> 	; 27/11/2020
 10286                              <1> 	; 25/11/2020
 10287                              <1> 	; (vbe.c, 02/01/2020, vruppert)
 10288                              <1> 	;
 10289                              <1> 	; Input:
 10290                              <1> 	;	AX = resolution (screen width)
 10291                              <1> 	;
 10292                              <1> 	; Modified registers: eax, edx
 10293                              <1> 
 10294                              <1>   	;;push	ebx
 10295                              <1>   	;push	edx
 10296                              <1> 	;push	eax
 10297                              <1>   	;mov	ebx, eax
 10298                              <1>   	;call	dispi_get_bpp ; bits per pixel
 10299                              <1> 	;cmp	al, 4
 10300                              <1> 	;ja	short set_width_svga  ; 8, 16, 24, 32 
 10301                              <1> 	;shr	bx, 1
 10302                              <1> ;set_width_svga:
 10303                              <1> 	;shr	bx, 3
 10304                              <1> 	;mov	eax, [esp]
 10305 000040B2 66C1E803            <1> 	shr	ax, 3	; / 8, bytes per row
 10306 000040B6 66BAD403            <1> 	mov	dx, 3D4h ; VGAREG_VGA_CRTC_ADDRESS
 10307                              <1> 	;mov	ah, bl	; 
 10308 000040BA 88C4                <1> 	mov	ah, al	; width in bytes
 10309 000040BC B013                <1> 	mov	al, 13h	; offset register
 10310 000040BE 66EF                <1> 	out	dx, ax	; index (3D4h) and data (3D5h)
 10311                              <1> 	;pop	eax
 10312                              <1> 	;pop  	edx
 10313                              <1> 	;;pop	ebx
 10314 000040C0 C3                  <1> 	retn
 10315                              <1> 
 10316                              <1> ; 24/11/2020
 10317                              <1> 
 10318                              <1> struc bmi ; BOCHS/PLEX86 MODE INFO structure/table 
 10319 00000000 <res 00000002>      <1>  .mode:	  resw 1
 10320 00000002 <res 00000002>      <1>  .width:  resw 1
 10321 00000004 <res 00000002>      <1>  .height: resw 1
 10322 00000006 <res 00000002>      <1>  .depth:  resw 1
 10323                              <1>  .size:	
 10324                              <1> endstruc
 10325                              <1> 
 10326                              <1> ; 24/11/2020
 10327                              <1> struc MODEINFO
 10328 00000000 <res 00000002>      <1>  .mode:			resw 1  ; 1XXh
 10329 00000002 <res 00000002>      <1>  .ModeAttributes:	resw 1
 10330 00000004 <res 00000001>      <1>  .WinAAttributes:	resb 1
 10331 00000005 <res 00000001>      <1>  .WinBAttributes:	resb 1	; = 0
 10332 00000006 <res 00000002>      <1>  .WinGranularity:	resw 1
 10333 00000008 <res 00000002>      <1>  .WinSize:		resw 1
 10334 0000000A <res 00000002>      <1>  .WinASegment:		resw 1
 10335 0000000C <res 00000002>      <1>  .WinBSegment:		resw 1	; = 0
 10336 0000000E <res 00000004>      <1>  .WinFuncPtr:		resd 1	; = 0
 10337 00000012 <res 00000002>      <1>  .BytesPerScanLine:	resw 1
 10338 00000014 <res 00000002>      <1>  .XResolution:		resw 1
 10339 00000016 <res 00000002>      <1>  .YResolution:		resw 1
 10340 00000018 <res 00000001>      <1>  .XCharSize:		resb 1
 10341 00000019 <res 00000001>      <1>  .YCharSize:		resb 1
 10342 0000001A <res 00000001>      <1>  .NumberOfPlanes: 	resb 1
 10343 0000001B <res 00000001>      <1>  .BitsPerPixel:		resb 1
 10344 0000001C <res 00000001>      <1>  .NumberOfBanks:	resb 1
 10345 0000001D <res 00000001>      <1>  .MemoryModel:		resb 1
 10346 0000001E <res 00000001>      <1>  .BankSize:		resb 1	; = 0
 10347 0000001F <res 00000001>      <1>  .NumberOfImagePages: 	resb 1
 10348 00000020 <res 00000001>      <1>  .Reserved_page:	resb 1	; = 0
 10349 00000021 <res 00000001>      <1>  .RedMaskSize:		resb 1
 10350 00000022 <res 00000001>      <1>  .RedFieldPosition: 	resb 1
 10351 00000023 <res 00000001>      <1>  .GreenMaskSize:	resb 1
 10352 00000024 <res 00000001>      <1>  .GreenFieldPosition: 	resb 1
 10353 00000025 <res 00000001>      <1>  .BlueMaskSize:		resb 1
 10354 00000026 <res 00000001>      <1>  .BlueFieldPosition: 	resb 1
 10355 00000027 <res 00000001>      <1>  .RsvdMaskSize:		resb 1
 10356 00000028 <res 00000001>      <1>  .RsvdFieldPosition: 	resb 1
 10357 00000029 <res 00000001>      <1>  .DirectColorModeInfo: 	resb 1
 10358 0000002A <res 00000004>      <1>  .PhysBasePtr:		resd 1
 10359 0000002E <res 00000004>      <1>  .OffScreenMemOffset: 	resd 1	; = 0
 10360 00000032 <res 00000002>      <1>  .OffScreenMemSize: 	resw 1	; = 0
 10361 00000034 <res 00000002>      <1>  .LinBytesPerScanLine: 	resw 1
 10362 00000036 <res 00000001>      <1>  .BnkNumberOfPages: 	resb 1
 10363 00000037 <res 00000001>      <1>  .LinNumberOfPages: 	resb 1
 10364 00000038 <res 00000001>      <1>  .LinRedMaskSize:	resb 1
 10365 00000039 <res 00000001>      <1>  .LinRedFieldPosition1: resb 1
 10366 0000003A <res 00000001>      <1>  .LinGreenMaskSize1: 	resb 1
 10367 0000003B <res 00000001>      <1>  .LinGreenFieldPosition:resb 1
 10368 0000003C <res 00000001>      <1>  .LinBlueMaskSize: 	resb 1
 10369 0000003D <res 00000001>      <1>  .LinBlueFieldPosition:	resb 1
 10370 0000003E <res 00000001>      <1>  .LinRsvdMaskSize: 	resb 1
 10371 0000003F <res 00000001>      <1>  .LinRsvdFieldPosition:	resb 1
 10372 00000040 <res 00000004>      <1>  .MaxPixelClock:	resd 1	; = 0
 10373                              <1> .size:
 10374                              <1> endstruc
 10375                              <1> 
 10376                              <1> ; 10/12/2020
 10377                              <1> struc LFBINFO
 10378 00000000 <res 00000002>      <1>  .mode:			resw 1  ; 1XXh
 10379 00000002 <res 00000004>      <1>  .LFB_addr:		resd 1
 10380 00000006 <res 00000004>      <1>  .LFB_size:		resd 1
 10381 0000000A <res 00000002>      <1>  .X_res:		resw 1
 10382 0000000C <res 00000002>      <1>  .Y_res:		resw 1
 10383 0000000E <res 00000001>      <1>  .bpp:			resb 1
 10384 0000000F <res 00000001>      <1>  .reserved:		resb 1
 10385                              <1> .size:	; 16 bytes
 10386                              <1> endstruc
 10387                              <1> 
 10388                              <1> set_mode_info_list:
 10389                              <1> 	; 14/12/2020
 10390                              <1> 	; 11/12/2020
 10391                              <1> 	; 24/11/2020
 10392                              <1> 	; (vbetables-gen.c)
 10393                              <1> 	; Input:
 10394                              <1> 	;	BX = VBE mode (including bochs special modes) 
 10395                              <1> 	; Output:
 10396                              <1> 	;	;;EAX = MODE_INFO_LIST address
 10397                              <1> 	;	EAX = 0 ; 11/12/2020
 10398                              <1> 	;	ESI = MODE_INFO_LIST address ; 11/12/2020
 10399                              <1> 	;	(if mode is not found, ESI = 0)
 10400                              <1> 	;
 10401                              <1> 	; Modified registers: eax, ebx, ecx, edx, esi, edi 
 10402                              <1> 
 10403 000040C1 BE[46730000]        <1> 	mov	esi, b_vbe_modes ; bochs mode info base table	
 10404 000040C6 BF[3A120300]        <1> 	mov	edi, MODE_INFO_LIST ; mode info list (4F01h)
 10405                              <1> sml_0:
 10406 000040CB 66AD                <1> 	lodsw	
 10407 000040CD 6639D8              <1> 	cmp	ax, bx ; is mode number same ?
 10408 000040D0 7410                <1> 	je	short sml_1 ; yes
 10409 000040D2 AD                  <1> 	lodsd
 10410 000040D3 66AD                <1> 	lodsw	
 10411 000040D5 81FE[06740000]      <1> 	cmp	esi, end_of_b_vbe_modes
 10412 000040DB 72EE                <1> 	jb	short sml_0
 10413                              <1> 	; not found
 10414 000040DD 31C0                <1> 	xor	eax, eax ; 0
 10415                              <1> 	; 11/12/2020
 10416 000040DF 31F6                <1> 	xor	esi, esi
 10417 000040E1 C3                  <1> 	retn
 10418                              <1> sml_1:
 10419 000040E2 66AB                <1> 	stosw	; mode
 10420 000040E4 AD                  <1> 	lodsd	; width, height
 10421                              <1> 	; 14/12/2020
 10422 000040E5 89C1                <1> 	mov	ecx, eax
 10423 000040E7 50                  <1> 	push	eax ; ***
 10424 000040E8 29C0                <1> 	sub	eax, eax ; clear high word of eax
 10425 000040EA 66AD                <1> 	lodsw	; depth
 10426 000040EC 50                  <1> 	push	eax ; **
 10427                              <1> 
 10428                              <1> 	;add	al, 7 ; only for 15 bit colors (not used here)
 10429 000040ED C0E803              <1> 	shr	al, 3 ; / 8
 10430                              <1> 	; 14/12/2020
 10431 000040F0 66F7E1              <1> 	mul	cx  ; pitch = width * ((depth+7)/8)
 10432                              <1> 		; ax = pitch
 10433 000040F3 50                  <1> 	push	eax ; * ; high word of eax = 0
 10434 000040F4 C1E910              <1> 	shr	ecx, 16
 10435                              <1> 	;mul	cx
 10436                              <1> 	;mov	cx, ax
 10437 000040F7 31D2                <1> 	xor	edx, edx  ; clear high word of edx
 10438 000040F9 F7E1                <1> 	mul	ecx ; height * pitch
 10439 000040FB 89C1                <1> 	mov	ecx, eax
 10440 000040FD B800000001          <1> 	mov	eax, VBE_DISPI_TOTAL_VIDEO_MEMORY_MB * 1024 * 1024
 10441 00004102 F7F1                <1> 	div	ecx
 10442                              <1> 		; eax = pages = vram_size / (height*pitch)
 10443                              <1> 	
 10444                              <1> 	;mov	cx, ax
 10445 00004104 89C1                <1> 	mov	ecx, eax ; pages 
 10446                              <1> 		
 10447 00004106 66B89B00            <1> 	mov	ax, MODE_ATTRIBUTES
 10448 0000410A 66AB                <1> 	stosw	; ModeAttributes
 10449 0000410C B007                <1> 	mov	al, WINA_ATTRIBUTES
 10450 0000410E AA                  <1> 	stosb	; WinAAttributes
 10451 0000410F 30C0                <1> 	xor	al, al ; WinBAttributes = 0
 10452 00004111 AA                  <1> 	stosb
 10453 00004112 66B84000            <1> 	mov	ax, VBE_DISPI_BANK_SIZE_KB
 10454 00004116 66AB                <1> 	stosw	; WinGranularity
 10455 00004118 66AB                <1> 	stosw	; WinSize
 10456 0000411A 66B800A0            <1> 	mov	ax, VGAMEM_GRAPH
 10457 0000411E 66AB                <1> 	stosw	; WinASegment
 10458 00004120 29C0                <1> 	sub	eax, eax
 10459 00004122 66AB                <1> 	stosw	; WinBSegment = 0
 10460 00004124 AB                  <1> 	stosd	; WinFuncPtr = 0
 10461                              <1> 
 10462 00004125 58                  <1> 	pop	eax ; * ; pitch
 10463 00004126 89C3                <1> 	mov	ebx, eax  ; high word of ebx = 0 ; 14/12/2020
 10464 00004128 66AB                <1> 	stosw	; BytesPerScanLine
 10465                              <1> 
 10466 0000412A 5A                  <1> 	pop	edx ; ** ; depth (bits per pixel)
 10467 0000412B 58                  <1> 	pop	eax ; *** width, height
 10468                              <1> 
 10469                              <1>  	; // Mandatory information for VBE 1.2 and above
 10470                              <1> 
 10471 0000412C 66AB                <1> 	stosw	; XResolution (width)
 10472 0000412E C1E810              <1> 	shr	eax, 16
 10473 00004131 50                  <1> 	push	eax ; **** height
 10474 00004132 66AB                <1> 	stosw	; YResolution (height)
 10475 00004134 B008                <1> 	mov	al, 8
 10476 00004136 AA                  <1>  	stosb	; XCharSize  ; char width
 10477 00004137 B010                <1> 	mov	al, 16
 10478 00004139 AA                  <1> 	stosb	; YCharSize  ; char height
 10479 0000413A B001                <1> 	mov	al, 1
 10480 0000413C AA                  <1> 	stosb	; NumberOfPlanes
 10481                              <1> 	;movzx	eax, dl
 10482 0000413D 88D0                <1> 	mov	al, dl ; eax <= 32
 10483 0000413F AA                  <1> 	stosb	; BitsPerPixel
 10484                              <1> 	; Number of banks = (height * pitch + 65535) / 65536
 10485 00004140 58                  <1> 	pop	eax ; **** ; height
 10486                              <1> 	; 14/12/2020
 10487 00004141 52                  <1> 	push	edx ; ***** ; depth ; edx <= 32
 10488 00004142 F7E3                <1> 	mul	ebx  ; pitch (ebx) * height (eax)
 10489                              <1> 	;mov	edx, [esp] ; *****
 10490                              <1> 	;mov	dl, [esp] ; *****
 10491 00004144 05FFFF0000          <1> 	add	eax, 65535
 10492 00004149 C1E810              <1> 	shr	eax, 16 ; / 65536 ; <= 127 ; 14/12/2020
 10493 0000414C AA                  <1> 	stosb	; NumberOfBanks
 10494                              <1> 	; 14/12/2020
 10495                              <1> 	;cmp	dl, 8 ; 8 bits per pixel
 10496 0000414D 803C2408            <1> 	cmp	byte [esp], 8
 10497 00004151 7704                <1> 	ja	short sml_2
 10498 00004153 B004                <1> 	mov	al, VBE_MEMORYMODEL_PACKED_PIXEL
 10499 00004155 EB02                <1> 	jmp	short sml_3
 10500                              <1> sml_2:
 10501                              <1> 	; 16, 24, 32 bts per pixel
 10502 00004157 B006                <1> 	mov	al, VBE_MEMORYMODEL_DIRECT_COLOR	
 10503                              <1> sml_3:
 10504 00004159 AA                  <1> 	stosb
 10505 0000415A 30C0                <1> 	xor	al, al ; 0
 10506 0000415C AA                  <1> 	stosb	; BankSize = 0
 10507 0000415D 49                  <1> 	dec	ecx ; pages - 1
 10508                              <1> 	; NumberOfImagePages = 262 for 320x200x8 mode
 10509                              <1> 	;;mov	ax, 255
 10510                              <1> 	; 14/12/2020
 10511                              <1> 	;mov	al, 255
 10512 0000415E FEC8                <1> 	dec	al ; 255
 10513 00004160 39C1                <1> 	cmp	ecx, eax ; ecx <= 261, eax = 255 
 10514                              <1> 	;cmp	cx, ax
 10515 00004162 7302                <1> 	jnb	short sml_4
 10516 00004164 88C8                <1> 	mov	al, cl	 
 10517                              <1> sml_4:
 10518 00004166 AA                  <1> 	stosb	; NumberOfImagePages (1 byte)
 10519 00004167 28C0                <1> 	sub	al, al
 10520 00004169 AA                  <1> 	stosb	; Reserved_page = 0
 10521 0000416A 58                  <1> 	pop	eax ; ***** ; depth
 10522 0000416B 88C1                <1> 	mov	cl, al
 10523                              <1> 	; eax < = 32
 10524 0000416D 2C08                <1> 	sub	al, 8 ; 8->0, 16->8, 24->16, 32->24	
 10525 0000416F BE[06740000]        <1> 	mov	esi, direct_color_fields
 10526 00004174 01C6                <1> 	add	esi, eax
 10527 00004176 56                  <1> 	push	esi ; ******
 10528 00004177 AD                  <1> 	lodsd	; RedMaskSize (AL), RedFieldPosition (AH)
 10529                              <1> 	     	; GreenMaskSize (16), GreenFieldPosition (24)	
 10530 00004178 AB                  <1> 	stosd
 10531 00004179 AD                  <1> 	lodsd	; BlueMaskSize (AL), BlueFieldPosition (AH)
 10532                              <1> 	     	; RsvdMaskSize (16), RsvdFieldPosition (24)
 10533 0000417A AB                  <1> 	stosd
 10534 0000417B 5E                  <1> 	pop	esi ; ******
 10535                              <1> 
 10536 0000417C 30C0                <1> 	xor	al, al ; 0
 10537 0000417E 80F920              <1> 	cmp	cl, 32
 10538 00004181 7202                <1> 	jb	short sml_5
 10539 00004183 B002                <1> 	mov	al, VBE_DIRECTCOLOR_RESERVED_BITS_AVAILABLE
 10540                              <1> sml_5: 
 10541 00004185 AA                  <1> 	stosb	; DirectColorModeInfo
 10542                              <1> 
 10543                              <1> 	; // Mandatory information for VBE 2.0 and above
 10544                              <1> 
 10545 00004186 B8000000E0          <1> 	mov	eax, VBE_DISPI_LFB_PHYSICAL_ADDRESS
 10546 0000418B AB                  <1> 	stosd	; PhysBasePtr
 10547 0000418C 29C0                <1> 	sub	eax, eax
 10548 0000418E AB                  <1> 	stosd	; OffScreenMemOffset = 0
 10549 0000418F 66AB                <1> 	stosw	; OffScreenMemSize = 0
 10550                              <1> 
 10551                              <1> 	;// Mandatory information for VBE 3.0 and above
 10552                              <1> 
 10553                              <1> 	; ebx = pitch
 10554 00004191 6689D8              <1> 	mov	ax, bx
 10555                              <1> 	;stosw
 10556                              <1> 
 10557                              <1> 	;xor	al, al
 10558                              <1>      	;stosb	; BnkNumberOfPages = 0
 10559                              <1>      	;stosb	; LinNumberOfPages = 0
 10560                              <1> 
 10561 00004194 AB                  <1> 	stosd	; pitch (word), 0 (byte), 0 (byte)  
 10562                              <1> 
 10563 00004195 AD                  <1> 	lodsd	; LinRedMaskSize (AL), LinRedFieldPosition (AH)
 10564                              <1> 	     	; LinGreenMaskSize (16), LinGreenFieldPosition (24)	
 10565 00004196 AB                  <1> 	stosd
 10566 00004197 AD                  <1> 	lodsd	; LinBlueMaskSize (AL), LinBlueFieldPosition (AH)
 10567                              <1> 	     	; LinRsvdMaskSize (16), LinRsvdFieldPosition (24)
 10568 00004198 AB                  <1> 	stosd
 10569                              <1> 
 10570 00004199 29C0                <1> 	sub	eax, eax
 10571 0000419B AB                  <1> 	stosd	; MaxPixelClock = 0
 10572                              <1> 
 10573                              <1> 	;mov	eax, MODE_INFO_LIST
 10574                              <1> 	; 11/12/2020
 10575 0000419C BE[3A120300]        <1> 	mov	esi, MODE_INFO_LIST
 10576                              <1> 	
 10577 000041A1 C3                  <1> 	retn	
 10578                              <1> 
 10579                              <1> ; end of set_mode_info_list ; edi = set_mode_info_list + 68
 10580                              <1> 
 10581                              <1> pci_get_lfb_addr:
 10582                              <1> 	; 11/12/2020
 10583                              <1> 	; Get linear frame buffer base from PCI
 10584                              <1> 	; (vgabios.c, 02/01/2020, vruppert)
 10585                              <1> 	;
 10586                              <1> 	; Input:
 10587                              <1> 	;	ax = PCI device vendor id
 10588                              <1> 	; Output:
 10589                              <1> 	;	ax  = LFB address (high 16 bit) (zf=0)
 10590                              <1> 	;	eax = 0 -> not found (error) (zf=1)
 10591                              <1> 	;
 10592                              <1> 	; Modified registers: eax
 10593                              <1> 
 10594 000041A2 53                  <1> 	push	ebx
 10595 000041A3 51                  <1> 	push	ecx
 10596 000041A4 52                  <1> 	push	edx
 10597                              <1> 	;
 10598 000041A5 89C3                <1> 	mov	ebx, eax
 10599 000041A7 31C9                <1> 	xor	ecx, ecx
 10600 000041A9 28D2                <1> 	sub	dl, dl	; mov dl, 0
 10601 000041AB E842000000          <1> 	call	pci_read_reg
 10602 000041B0 6683F8FF            <1> 	cmp	ax, 0FFFFh
 10603 000041B4 7417                <1> 	je	short pci_get_lfb_addr_fail
 10604                              <1> pci_get_lfb_addr_next_dev:
 10605 000041B6 28D2                <1> 	sub	dl, dl ; mov dl, 0
 10606 000041B8 E835000000          <1> 	call	pci_read_reg
 10607 000041BD 6639D8              <1> 	cmp	ax, bx	; check vendor
 10608 000041C0 740F                <1> 	je	short pci_get_lfb_addr_found
 10609 000041C2 6683C108            <1> 	add	cx, 08h
 10610 000041C6 6681F90002          <1> 	cmp	cx, 200h ; search bus 0 and 1
 10611 000041CB 72E9                <1> 	jb	short pci_get_lfb_addr_next_dev
 10612                              <1> pci_get_lfb_addr_fail:
 10613 000041CD 31C0                <1> 	xor	eax, eax ; no LFB
 10614                              <1> 	; zf = 1
 10615 000041CF EB1D                <1> 	jmp	short pci_get_lfb_addr_return
 10616                              <1> pci_get_lfb_addr_found:
 10617 000041D1 B210                <1> 	mov	dl, 10h	; I/O space 0
 10618 000041D3 E81A000000          <1> 	call	pci_read_reg
 10619 000041D8 66A9F1FF            <1> 	test	ax, 0FFF1h
 10620 000041DC 740D                <1> 	jz	short pci_get_lfb_addr_success
 10621 000041DE B214                <1> 	mov	dl, 14h ; I/O space 1
 10622 000041E0 E80D000000          <1> 	call	pci_read_reg
 10623 000041E5 66A9F1FF            <1> 	test	ax, 0FFF1h
 10624 000041E9 75E2                <1> 	jnz	short pci_get_lfb_addr_fail
 10625                              <1> pci_get_lfb_addr_success:
 10626 000041EB C1E810              <1> 	shr	eax, 16 ; LFB address (hw)
 10627                              <1> 	; zf = 0
 10628                              <1> pci_get_lfb_addr_return:
 10629 000041EE 5A                  <1> 	pop	edx
 10630 000041EF 59                  <1> 	pop	ecx
 10631 000041F0 5B                  <1> 	pop	ebx
 10632 000041F1 C3                  <1> 	retn
 10633                              <1> 
 10634                              <1> pci_read_reg:
 10635                              <1> 	; 11/12/2020
 10636                              <1> 	; Read PCI register
 10637                              <1> 	; (vgabios.c, 02/01/2020, vruppert)
 10638                              <1> 	;
 10639                              <1> 	; Input:
 10640                              <1> 	;	cx = device/function
 10641                              <1> 	;	dl = register
 10642                              <1> 	; Output:
 10643                              <1> 	;	eax = value
 10644                              <1> 	;
 10645                              <1> 	; Modified registers: eax, edx
 10646                              <1> 
 10647 000041F2 B800008000          <1> 	mov	eax, 00800000h 
 10648 000041F7 6689C8              <1> 	mov	ax, cx
 10649 000041FA C1E008              <1> 	shl	eax, 8
 10650 000041FD 88D0                <1> 	mov	al, dl
 10651 000041FF 66BAF80C            <1> 	mov	dx, 0CF8h
 10652 00004203 EF                  <1>  	out	dx, eax
 10653 00004204 80C204              <1> 	add	dl, 4 ; mov dx, 0CFCh
 10654 00004207 ED                  <1> 	in	eax, dx
 10655 00004208 C3                  <1> 	retn
 10656                              <1> 
 10657                              <1> %endif
 10658                              <1> 
 10659                              <1> ; -----------
 10660                              <1> 
 10661                              <1> %if 0
 10662                              <1> 
 10663                              <1> mode_info_find_mode:
 10664                              <1> 	; 25/11/2020
 10665                              <1> 	; Input:
 10666                              <1> 	;	bx = VESA VBE2 video mode (+ bochs extensions)
 10667                              <1> 	; Output:
 10668                              <1> 	;	esi = mode info address (for BX input)
 10669                              <1> 	;	esi = 0 -> not found
 10670                              <1> 	;
 10671                              <1> 	; Modified registers: eax, esi
 10672                              <1> 
 10673                              <1> 	xor	eax, eax
 10674                              <1> 	mov	esi, MODE_INFO_LIST
 10675                              <1> mifm_1:
 10676                              <1> 	mov	ax, [esi]
 10677                              <1> 	cmp	ax, bx
 10678                              <1> 	je	short mifm_2
 10679                              <1> 	add	esi, MODEINFO.size ; add esi, 68
 10680                              <1> 	cmp	esi, VBE_VESA_MODE_END_OF_LIST
 10681                              <1> 	jb	short mifm_1
 10682                              <1> 	; not found
 10683                              <1> 	sub	esi, esi ; 0
 10684                              <1> mifm_2
 10685                              <1> 	retn
 10686                              <1> 
 10687                              <1> dispi_get_bpp:
 10688                              <1> 	; 28/11/2020
 10689                              <1> 	; Input:
 10690                              <1> 	;	none
 10691                              <1> 	; Output:
 10692                              <1> 	;	al = Bits per pixel
 10693                              <1> 	;	     (8,16,24,32)
 10694                              <1> 	;	ah = Bytes per pixel
 10695                              <1> 	;	     (1,2,3,4)	
 10696                              <1> 	;
 10697                              <1> 	; Modified registers: none
 10698                              <1> 
 10699                              <1> 	;push	edx
 10700                              <1> 	;mov	dx, 01CEh ; VBE_DISPI_IOPORT_INDEX
 10701                              <1> 	;mov	ax, 03h	  ; VBE_DISPI_INDEX_BPP
 10702                              <1> 	;out	dx, ax
 10703                              <1> 	;;mov	dx, 01CFh ; VBE_DISPI_IOPORT_DATA
 10704                              <1> 	;;mov	dl, 0CFh
 10705                              <1> 	;inc	dl
 10706                              <1> 	;in	ax, dx
 10707                              <1> 	;mov	ah, al
 10708                              <1> 	;shr	ah, 3 ; / 8
 10709                              <1> 	;;test	al, 7 ; 15 bit graphics mode
 10710                              <1>  	;;jz	short get_bpp_noinc
 10711                              <1> 	;;inc	ah
 10712                              <1> ;;get_bpp_noinc:
 10713                              <1> 	;pop	edx
 10714                              <1> 	;retn
 10715                              <1> 
 10716                              <1> 	; 28/11/2020
 10717                              <1> 	; Modified registers: edx
 10718                              <1> 	;push	edx
 10719                              <1> 	mov	dx, 03h ; VBE_DISPI_INDEX_BPP
 10720                              <1> 	call	dispi_get_parms
 10721                              <1> 	;pop	edx
 10722                              <1> 	;retn
 10723                              <1> 	mov	ah, al
 10724                              <1> 	shr	ah, 3 ; / 8
 10725                              <1> 	;test	al, 7 ; 15 bit graphips mode
 10726                              <1>  	;jz	short get_bpp_noinc
 10727                              <1> 	;inc	ah
 10728                              <1> ;get_bpp_noinc:
 10729                              <1> 	;pop	edx
 10730                              <1> 	retn
 10731                              <1> 
 10732                              <1> restore_vesa_video_state:
 10733                              <1> 	; 14/01/2021
 10734                              <1> 	; 06/12/2020
 10735                              <1> 	; Input:
 10736                              <1> 	;	[vbe3stbufsize] <= 32 ; <= 32*64 bytes
 10737                              <1> 	; Output:
 10738                              <1> 	;	AX = 004Fh (successed)
 10739                              <1> 	;
 10740                              <1> 	;	eax = 0 -> buffer size problem
 10741                              <1> 	;	eax > 0 and ax <> 004Fh -> failed
 10742                              <1> 	;
 10743                              <1> 	; Modified regs: eax, ebx, ecx, edx, esi, edi 
 10744                              <1> 
 10745                              <1> 	;movzx	ecx, word [vbe3stbufsize]  
 10746                              <1> 	;cmp	cx, 32 ; 32 * 64 bytes
 10747                              <1> 	;ja	short r_v_b_s_fail
 10748                              <1> 
 10749                              <1> 	movzx	ecx, byte [vbe3stbufsize]; <=32	
 10750                              <1> 	shl	cx, 4 ; dword count for movsd
 10751                              <1> 	mov	edi, VBE3SAVERESTOREBLOCK ; destination
 10752                              <1> 					; (vbe3 pmi buff)
 10753                              <1> 	mov	esi, VBE3VIDEOSTATE ; source (kernel buff)
 10754                              <1> 	rep	movsd	
 10755                              <1> 
 10756                              <1> 	mov	ax, 4F04h
 10757                              <1> 	mov	dl, 02h ; restore
 10758                              <1> 	;mov	cx, 0Fh
 10759                              <1> 	mov	cl, 0Fh
 10760                              <1> 	xor 	ebx, ebx ; points to VBE3SAVERESTOREBLOCK
 10761                              <1> 	jmp	short int10h_32bit_pmi
 10762                              <1> 
 10763                              <1> ;s_v_b_s_fail:
 10764                              <1> ;r_v_b_s_fail:
 10765                              <1> ;	xor	eax, eax
 10766                              <1> ;	retn
 10767                              <1> 
 10768                              <1> save_vesa_video_state:
 10769                              <1> 	; 14/01/2021
 10770                              <1> 	; 06/12/2020
 10771                              <1> 	; Input:
 10772                              <1> 	;	[vbe3stbufsize] <= 32 ; <= 32*64 bytes
 10773                              <1> 	; Output:
 10774                              <1> 	;	AX = 004Fh (successed)
 10775                              <1> 	;
 10776                              <1> 	;	eax = 0 -> buffer size problem
 10777                              <1> 	;	eax > 0 and ax <> 004Fh -> failed
 10778                              <1> 	;
 10779                              <1> 	; Modified regs: eax, ebx, ecx, edx, esi, edi 
 10780                              <1> 
 10781                              <1> 	;cmp	word [vbe33stbufsize], 32  
 10782                              <1> 	;			; 32 * 64 bytes
 10783                              <1> 	;ja	short s_v_b_s_fail
 10784                              <1> 
 10785                              <1> 	mov	ax, 4F04h
 10786                              <1> 	mov	dl, 01h ; save
 10787                              <1> 	;mov	cx, 0Fh
 10788                              <1> 	mov	cl, 0Fh
 10789                              <1> 	xor 	ebx, ebx ; points to VBE3SAVERESTOREBLOCK
 10790                              <1> 
 10791                              <1> 	call	int10h_32bit_pmi
 10792                              <1> 
 10793                              <1> 	movzx	ecx, byte [vbe3stbufsize]; <=32	
 10794                              <1> 	shl	cx, 4 ; dword count for movsd
 10795                              <1> 	mov	esi, VBE3SAVERESTOREBLOCK ; destination
 10796                              <1> 					; (vbe3 pmi buff)
 10797                              <1> 	mov	edi, VBE3VIDEOSTATE ; source (kernel buff)
 10798                              <1> 	rep	movsd	
 10799                              <1> 	retn
 10800                              <1> 
 10801                              <1> dispi_set_bank_farcall:
 10802                              <1> 	; 11/12/2020
 10803                              <1> 	; (This may be 'sysvideo' function, later)
 10804                              <1> 	;
 10805                              <1> 	; Input: 
 10806                              <1> 	;	bx = 0000h, set bank number
 10807                              <1> 	;	   = 0100h, get bank number
 10808                              <1> 	;	dx = bank number (if bx = 0)	
 10809                              <1> 	; Output:
 10810                              <1> 	;	dx = bank number
 10811                              <1> 		 	
 10812                              <1> 	cmp	bx, 0100h
 10813                              <1> 	je	short dispi_set_bank_farcall_get
 10814                              <1> 	or	bx, bx
 10815                              <1> 	jnz	dispi_set_bank_farcall_error
 10816                              <1> 	mov	ax, dx
 10817                              <1> 	push	dx
 10818                              <1> 	push	ax
 10819                              <1> 	mov	ax, VBE_DISPI_INDEX_BANK
 10820                              <1> 	mov	dx, VBE_DISPI_IOPORT_INDEX
 10821                              <1> 	out	dx, ax
 10822                              <1> 	pop	ax
 10823                              <1> 	mov	dx, VBE_DISPI_IOPORT_DATA
 10824                              <1> 	out	dx, ax
 10825                              <1> 	in	ax, dx
 10826                              <1> 	pop	dx
 10827                              <1> 	cmp	dx, ax
 10828                              <1> 	jne	short dispi_set_bank_farcall_error
 10829                              <1> 	mov	ax, 004Fh
 10830                              <1> 	retn	; retf for real mode far call
 10831                              <1> dispi_set_bank_farcall_get:
 10832                              <1> 	mov	ax, VBE_DISPI_INDEX_BANK
 10833                              <1> 	mov	dx, VBE_DISPI_IOPORT_INDEX
 10834                              <1> 	out	dx, ax
 10835                              <1> 	mov	dx, VBE_DISPI_IOPORT_DATA
 10836                              <1> 	in	ax, dx
 10837                              <1> 	mov	dx, ax
 10838                              <1> 	retn	; retf for real mode far call
 10839                              <1> dispi_set_bank_farcall_error:
 10840                              <1> 	mov	ax, 014Fh
 10841                              <1> 	retn	; retf for real mode far call
 10842                              <1> 
 10843                              <1> %endif
 10844                              <1> 
 10845                              <1> ; % include 'vidata.s' ; VIDEO DATA
 10846                              <1> 
 10847                              <1> ; /// End Of VIDEO FUNCTIONS ///
  2655                                  
  2656                                  setup_rtc_int:
  2657                                  ; source: http://wiki.osdev.org/RTC
  2658 00004209 FA                      	cli		; disable interrupts
  2659                                  	; default int frequency is 1024 Hz (Lower 4 bits of register A is 0110b or 6)
  2660                                  	; in order to change this ...
  2661                                  	; frequency  = 32768 >> (rate-1) --> 32768 >> 5 = 1024
  2662                                  	; (rate must be above 2 and not over 15)
  2663                                  	; new rate = 15 --> 32768 >> (15-1) = 2 Hz
  2664 0000420A B08A                    	mov	al, 8Ah 
  2665 0000420C E670                    	out	70h, al ; set index to register A, disable NMI
  2666 0000420E 90                      	nop
  2667 0000420F E471                    	in	al, 71h ; get initial value of register A
  2668 00004211 88C4                    	mov 	ah, al
  2669 00004213 80E4F0                  	and	ah, 0F0h
  2670 00004216 B08A                    	mov	al, 8Ah 
  2671 00004218 E670                    	out	70h, al ; reset index to register A
  2672 0000421A 88E0                    	mov	al, ah
  2673 0000421C 0C0F                    	or	al, 0Fh	; new rate (0Fh -> 15)
  2674 0000421E E671                    	out	71h, al ; write only our rate to A. Note, rate is the bottom 4 bits. 
  2675                                  	; enable RTC interrupt
  2676 00004220 B08B                    	mov	al, 8Bh ;
  2677 00004222 E670                    	out	70h, al ; select register B and disable NMI
  2678 00004224 90                      	nop
  2679 00004225 E471                    	in	al, 71h ; read the current value of register B
  2680 00004227 88C4                    	mov	ah, al  ;
  2681 00004229 B08B                    	mov 	al, 8Bh ;
  2682 0000422B E670                    	out	70h, al ; set the index again (a read will reset the index to register B)	
  2683 0000422D 88E0                    	mov	al, ah  ;
  2684 0000422F 0C40                    	or	al, 40h ;
  2685 00004231 E671                    	out	71h, al ; write the previous value ORed with 0x40. This turns on bit 6 of register B
  2686 00004233 FB                      	sti
  2687 00004234 C3                      	retn
  2688                                  
  2689                                  ; Write memory information
  2690                                  ; 29/01/2016
  2691                                  ; 06/11/2014
  2692                                  ; 14/08/2015 
  2693                                  memory_info:	
  2694 00004235 A1[94810100]            	mov	eax, [memory_size] ; in pages
  2695 0000423A 50                      	push	eax
  2696 0000423B C1E00C                  	shl	eax, 12		   ; in bytes
  2697 0000423E BB0A000000              	mov	ebx, 10
  2698 00004243 89D9                    	mov	ecx, ebx	   ; 10
  2699 00004245 BE[19440100]            	mov	esi, mem_total_b_str	
  2700 0000424A E8D7000000              	call	bintdstr
  2701 0000424F 58                      	pop	eax
  2702 00004250 B107                    	mov	cl, 7
  2703 00004252 BE[3D440100]            	mov	esi, mem_total_p_str
  2704 00004257 E8CA000000              	call	bintdstr	
  2705                                  	; 14/08/2015
  2706 0000425C E8E2000000              	call	calc_free_mem
  2707                                  	; edx = calculated free pages
  2708                                  	; ecx = 0
  2709 00004261 A1[98810100]            	mov 	eax, [free_pages]
  2710 00004266 39D0                    	cmp	eax, edx ; calculated free mem value 
  2711                                  		; and initial free mem value are same or not?
  2712 00004268 751D                    	jne 	short pmim ; print mem info with '?' if not
  2713 0000426A 52                      	push 	edx ; free memory in pages	
  2714                                  	;mov 	eax, edx
  2715 0000426B C1E00C                  	shl	eax, 12 ; convert page count
  2716                                  			; to byte count
  2717 0000426E B10A                    	mov	cl, 10
  2718 00004270 BE[5D440100]            	mov	esi, free_mem_b_str
  2719 00004275 E8AC000000              	call	bintdstr
  2720 0000427A 58                      	pop	eax
  2721 0000427B B107                    	mov	cl, 7
  2722 0000427D BE[81440100]            	mov	esi, free_mem_p_str
  2723 00004282 E89F000000              	call	bintdstr
  2724                                  pmim:
  2725 00004287 BE[07440100]            	mov	esi, msg_memory_info
  2726                                  	;
  2727 0000428C B407                    	mov	ah, 07h ; Black background, 
  2728                                  			; light gray forecolor
  2729                                  print_kmsg: ; 29/01/2016
  2730 0000428E 8825[BF810100]          	mov	[ccolor], ah
  2731                                  pkmsg_loop:
  2732 00004294 AC                      	lodsb
  2733 00004295 08C0                    	or	al, al
  2734 00004297 7410                    	jz	short pkmsg_ok
  2735 00004299 56                      	push	esi
  2736                                  	; 13/05/2016
  2737 0000429A 0FB61D[BF810100]        	movzx	ebx, byte [ccolor]
  2738                                  			; Video page 0 (bh=0)
  2739 000042A1 E857E0FFFF              	call	_write_tty
  2740 000042A6 5E                      	pop	esi
  2741 000042A7 EBEB                    	jmp	short pkmsg_loop
  2742                                  pkmsg_ok:
  2743 000042A9 C3                      	retn
  2744                                  
  2745                                  ; 19/12/2020
  2746                                  ; temporary
  2747                                  ; Write default liner frame buffer address
  2748                                  ;
  2749                                  default_lfb_info:	
  2750 000042AA 66A1[E30E0000]          	mov	ax, [def_LFB_addr] ; high word
  2751 000042B0 E829000000              	call	wordtohex
  2752 000042B5 A3[D9440100]            	mov	dword [lfb_addr_str], eax
  2753 000042BA BE[C2440100]            	mov	esi, msg_lfb_addr
  2754 000042BF B40F                    	mov	ah, 0Fh ; Black background, 
  2755                                  			; white forecolor
  2756 000042C1 EBCB                    	jmp	short print_kmsg
  2757                                  
  2758                                  ; Convert binary number to hexadecimal string
  2759                                  ; 10/05/2015  
  2760                                  ; dsectpm.s (28/02/2015)
  2761                                  ; Retro UNIX 386 v1 - Kernel v0.2.0.6  
  2762                                  ; 01/12/2014
  2763                                  ; 25/11/2014
  2764                                  ;
  2765                                  bytetohex:
  2766                                  	; INPUT ->
  2767                                  	; 	AL = byte (binary number)
  2768                                  	; OUTPUT ->
  2769                                  	;	AX = hexadecimal string
  2770                                  	;
  2771 000042C3 53                      	push	ebx
  2772 000042C4 31DB                    	xor	ebx, ebx
  2773 000042C6 88C3                    	mov	bl, al
  2774 000042C8 C0EB04                  	shr	bl, 4
  2775 000042CB 8A9B[15430000]          	mov	bl, [ebx+hexchrs] 	 	
  2776 000042D1 86D8                    	xchg	bl, al
  2777 000042D3 80E30F                  	and	bl, 0Fh
  2778 000042D6 8AA3[15430000]          	mov	ah, [ebx+hexchrs] 
  2779 000042DC 5B                      	pop	ebx	
  2780 000042DD C3                      	retn
  2781                                  
  2782                                  wordtohex:
  2783                                  	; INPUT ->
  2784                                  	; 	AX = word (binary number)
  2785                                  	; OUTPUT ->
  2786                                  	;	EAX = hexadecimal string
  2787                                  	;
  2788 000042DE 53                      	push	ebx
  2789 000042DF 31DB                    	xor	ebx, ebx
  2790 000042E1 86E0                    	xchg	ah, al
  2791 000042E3 6650                    	push	ax
  2792 000042E5 88E3                    	mov	bl, ah
  2793 000042E7 C0EB04                  	shr	bl, 4
  2794 000042EA 8A83[15430000]          	mov	al, [ebx+hexchrs] 	 	
  2795 000042F0 88E3                    	mov	bl, ah
  2796 000042F2 80E30F                  	and	bl, 0Fh
  2797 000042F5 8AA3[15430000]          	mov	ah, [ebx+hexchrs]
  2798 000042FB C1E010                  	shl	eax, 16
  2799 000042FE 6658                    	pop	ax
  2800 00004300 5B                      	pop	ebx
  2801 00004301 EBC0                    	jmp	short bytetohex
  2802                                  	;mov	bl, al
  2803                                  	;shr	bl, 4
  2804                                  	;mov	bl, [ebx+hexchrs] 	 	
  2805                                  	;xchg	bl, al	 	
  2806                                  	;and	bl, 0Fh
  2807                                  	;mov	ah, [ebx+hexchrs] 
  2808                                  	;pop	ebx	
  2809                                  	;retn
  2810                                  
  2811                                  dwordtohex:
  2812                                  	; INPUT ->
  2813                                  	; 	EAX = dword (binary number)
  2814                                  	; OUTPUT ->
  2815                                  	;	EDX:EAX = hexadecimal string
  2816                                  	;
  2817 00004303 50                      	push	eax
  2818 00004304 C1E810                  	shr	eax, 16
  2819 00004307 E8D2FFFFFF              	call	wordtohex
  2820 0000430C 89C2                    	mov	edx, eax
  2821 0000430E 58                      	pop	eax
  2822 0000430F E8CAFFFFFF              	call	wordtohex
  2823 00004314 C3                      	retn
  2824                                  
  2825                                  ; 10/05/2015
  2826                                  hex_digits:
  2827                                  hexchrs:
  2828 00004315 303132333435363738-     	db '0123456789ABCDEF'
  2828 0000431E 39414243444546     
  2829                                  ; 19/01/2021 - VESA EDID ready flag (4Fh)
  2830 00004325 00                      edid:	db 0
  2831                                  
  2832                                  ; Convert binary number to decimal/numeric string
  2833                                  ; 06/11/2014
  2834                                  ; Temporary Code
  2835                                  ;
  2836                                  
  2837                                  bintdstr:
  2838                                  	; EAX = binary number
  2839                                  	; ESI = decimal/numeric string address
  2840                                  	; EBX = divisor (10)
  2841                                  	; ECX = string length (<=10)
  2842 00004326 01CE                    	add	esi, ecx
  2843                                  btdstr0:
  2844 00004328 4E                      	dec	esi
  2845 00004329 31D2                    	xor	edx, edx
  2846 0000432B F7F3                    	div	ebx
  2847 0000432D 80C230                  	add	dl, 30h
  2848 00004330 8816                    	mov	[esi], dl
  2849 00004332 FEC9                    	dec	cl
  2850 00004334 740C                    	jz	short btdstr2 ; 08/09/2016
  2851 00004336 09C0                    	or	eax, eax
  2852 00004338 75EE                    	jnz	short btdstr0
  2853                                  btdstr1:
  2854 0000433A 4E                      	dec	esi
  2855 0000433B C60620                          mov     byte [esi], 20h ; blank space
  2856 0000433E FEC9                    	dec	cl
  2857 00004340 75F8                    	jnz	short btdstr1
  2858                                  btdstr2:
  2859 00004342 C3                      	retn
  2860                                  
  2861                                  ; Calculate free memory pages on M.A.T.
  2862                                  ; 06/11/2014
  2863                                  ; Temporary Code
  2864                                  ;
  2865                                  
  2866                                  calc_free_mem:
  2867 00004343 31D2                    	xor	edx, edx
  2868                                  	;xor	ecx, ecx
  2869 00004345 668B0D[A8810100]        	mov	cx, [mat_size] ; in pages
  2870 0000434C C1E10A                  	shl	ecx, 10	; 1024 dwords per page
  2871 0000434F BE00001000              	mov	esi, MEM_ALLOC_TBL
  2872                                  cfm0:
  2873 00004354 AD                      	lodsd
  2874 00004355 51                      	push	ecx
  2875 00004356 B920000000              	mov	ecx, 32
  2876                                  cfm1:
  2877 0000435B D1E8                    	shr	eax, 1
  2878 0000435D 7301                    	jnc	short cfm2
  2879 0000435F 42                      	inc	edx
  2880                                  cfm2:
  2881 00004360 E2F9                    	loop	cfm1
  2882 00004362 59                      	pop	ecx
  2883 00004363 E2EF                    	loop	cfm0
  2884 00004365 C3                      	retn
  2885                                  
  2886                                  %include 'diskio.s'  ; 07/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.2 - diskio.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 30/08/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; diskio.inc (22/08/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - DISKIO.INC
    20                              <1> ; Last Modification: 22/08/2015
    21                              <1> ; 	(Initialized Disk Parameters Data is in 'DISKDATA.INC') 
    22                              <1> ; 	(Uninitialized Disk Parameters Data is in 'DISKBSS.INC') 
    23                              <1> 
    24                              <1> ; DISK I/O SYSTEM - Erdogan Tan (Retro UNIX 386 v1 project)
    25                              <1> 
    26                              <1> ; ///////// DISK I/O SYSTEM ///////////////
    27                              <1> 
    28                              <1> ; 06/02/2015
    29                              <1> diskette_io:
    30 00004366 F8                  <1> 	clc ; 20/07/2020
    31 00004367 9C                  <1> 	pushfd
    32 00004368 0E                  <1> 	push 	cs
    33 00004369 E809000000          <1> 	call 	DISKETTE_IO_1
    34 0000436E C3                  <1> 	retn
    35                              <1> 	
    36                              <1> ;;;;;; DISKETTE I/O ;;;;;;;;;;;;;;;;;;;; 06/02/2015 ;;;
    37                              <1> ;//////////////////////////////////////////////////////
    38                              <1> 
    39                              <1> ; DISKETTE I/O - Erdogan Tan (Retro UNIX 386 v1 project)
    40                              <1> ; 20/02/2015
    41                              <1> ; 06/02/2015 (unix386.s)
    42                              <1> ; 16/12/2014 - 02/01/2015 (dsectrm2.s)
    43                              <1> ;
    44                              <1> ; Code (DELAY) modifications - AWARD BIOS 1999 (ADISK.EQU, COMMON.MAC)
    45                              <1> ;
    46                              <1> ; ADISK.EQU
    47                              <1> 
    48                              <1> ;----- Wait control constants 
    49                              <1> 
    50                              <1> ;amount of time to wait while RESET is active.
    51                              <1> 
    52                              <1> WAITCPU_RESET_ON	EQU	21		;Reset on must last at least 14us
    53                              <1> 						;at 250 KBS xfer rate.
    54                              <1> 						;see INTEL MCS, 1985, pg. 5-456
    55                              <1> 
    56                              <1> WAITCPU_FOR_STATUS	EQU	100		;allow 30 microseconds for
    57                              <1> 						;status register to become valid
    58                              <1> 						;before re-reading.
    59                              <1> 
    60                              <1> ;After sending a byte to NEC, status register may remain
    61                              <1> ;incorrectly set for 24 us.
    62                              <1> 
    63                              <1> WAITCPU_RQM_LOW		EQU	24		;number of loops to check for
    64                              <1> 						;RQM low.
    65                              <1> 
    66                              <1> ; COMMON.MAC
    67                              <1> ;
    68                              <1> ;	Timing macros
    69                              <1> ;
    70                              <1> 
    71                              <1> %macro 		SIODELAY 0 			; SHORT IODELAY
    72                              <1> 		jmp short $+2
    73                              <1> %endmacro		
    74                              <1> 
    75                              <1> %macro		IODELAY  0			; NORMAL IODELAY
    76                              <1> 		jmp short $+2
    77                              <1> 		jmp short $+2
    78                              <1> %endmacro
    79                              <1> 
    80                              <1> %macro		NEWIODELAY 0
    81                              <1> 		out	0ebh,al
    82                              <1> %endmacro 
    83                              <1> 
    84                              <1> ; (According to) AWARD BIOS 1999 - ATORGS.ASM (dw -> equ, db -> equ)
    85                              <1> ;;; WAIT_FOR_MEM
    86                              <1> ;WAIT_FDU_INT_LO	equ	017798		; 2.5 secs in 30 micro units.
    87                              <1> ;WAIT_FDU_INT_HI	equ	1
    88                              <1> WAIT_FDU_INT_LH		equ	83334		; 27/02/2015 (2.5 seconds waiting)
    89                              <1> ;;; WAIT_FOR_PORT
    90                              <1> ;WAIT_FDU_SEND_LO	equ	16667		; .5 secons in 30 us units.
    91                              <1> ;WAIT_FDU_SEND_HI	equ	0
    92                              <1> WAIT_FDU_SEND_LH	equ 	16667		; 27/02/2015	
    93                              <1> ;Time to wait while waiting for each byte of NEC results = .5
    94                              <1> ;seconds.  .5 seconds = 500,000 micros.  500,000/30 = 16,667.
    95                              <1> ;WAIT_FDU_RESULTS_LO	equ	16667		; .5 seconds in 30 micro units.
    96                              <1> ;WAIT_FDU_RESULTS_HI	equ	0
    97                              <1> WAIT_FDU_RESULTS_LH	equ	16667  ; 27/02/2015
    98                              <1> ;;; WAIT_REFRESH
    99                              <1> ;amount of time to wait for head settle, per unit in parameter
   100                              <1> ;table = 1 ms.
   101                              <1> WAIT_FDU_HEAD_SETTLE	equ	33		; 1 ms in 30 micro units.
   102                              <1> 
   103                              <1> 
   104                              <1> ; //////////////// DISKETTE I/O ////////////////
   105                              <1> 
   106                              <1> ; 11/12/2014 (copy from IBM PC-XT Model 286 BIOS - POSTEQU.INC)
   107                              <1> 
   108                              <1> ;----------------------------------------
   109                              <1> ;	EQUATES USED BY POST AND BIOS	:
   110                              <1> ;----------------------------------------
   111                              <1> 
   112                              <1> ;--------- 8042 KEYBOARD INTERFACE AND DIAGNOSTIC CONTROL REGISTERS ------------
   113                              <1> ;PORT_A		EQU	060H		; 8042 KEYBOARD SCAN CODE/CONTROL PORT
   114                              <1> ;PORT_B		EQU	061H		; PORT B READ/WRITE DIAGNOSTIC REGISTER
   115                              <1> ;REFRESH_BIT	EQU	00010000B	; REFRESH TEST BIT
   116                              <1> 
   117                              <1> ;----------------------------------------
   118                              <1> ;	CMOS EQUATES FOR THIS SYSTEM	:
   119                              <1> ;-------------------------------------------------------------------------------
   120                              <1> ;CMOS_PORT	EQU	070H		; I/O ADDRESS OF CMOS ADDRESS PORT
   121                              <1> ;CMOS_DATA	EQU	071H		; I/O ADDRESS OF CMOS DATA PORT
   122                              <1> ;NMI		EQU	10000000B	; DISABLE NMI INTERRUPTS MASK -
   123                              <1> 					;  HIGH BIT OF CMOS LOCATION ADDRESS
   124                              <1> 
   125                              <1> ;---------- CMOS TABLE LOCATION ADDRESS'S ## -----------------------------------
   126                              <1> CMOS_DISKETTE	EQU	010H		; DISKETTE DRIVE TYPE BYTE	      ;
   127                              <1> ;		EQU	011H		; - RESERVED			      ;C
   128                              <1> CMOS_DISK	EQU	012H		; FIXED DISK TYPE BYTE		      ;H
   129                              <1> ;		EQU	013H		; - RESERVED			      ;E
   130                              <1> CMOS_EQUIP	EQU	014H		; EQUIPMENT WORD LOW BYTE	      ;C
   131                              <1> 
   132                              <1> ;---------- DISKETTE EQUATES ---------------------------------------------------
   133                              <1> INT_FLAG	EQU	10000000B	; INTERRUPT OCCURRENCE FLAG
   134                              <1> DSK_CHG 	EQU	10000000B	; DISKETTE CHANGE FLAG MASK BIT
   135                              <1> DETERMINED	EQU	00010000B	; SET STATE DETERMINED IN STATE BITS
   136                              <1> HOME		EQU	00010000B	; TRACK 0 MASK
   137                              <1> SENSE_DRV_ST	EQU	00000100B	; SENSE DRIVE STATUS COMMAND
   138                              <1> TRK_SLAP	EQU	030H		; CRASH STOP (48 TPI DRIVES)
   139                              <1> QUIET_SEEK	EQU	00AH		; SEEK TO TRACK 10
   140                              <1> ;MAX_DRV 	EQU	2		; MAX NUMBER OF DRIVES
   141                              <1> HD12_SETTLE	EQU	15		; 1.2 M HEAD SETTLE TIME
   142                              <1> HD320_SETTLE	EQU	20		; 320 K HEAD SETTLE TIME
   143                              <1> MOTOR_WAIT	EQU	37		; 2 SECONDS OF COUNTS FOR MOTOR TURN OFF
   144                              <1> 
   145                              <1> ;---------- DISKETTE ERRORS ----------------------------------------------------
   146                              <1> ;TIME_OUT	EQU	080H		; ATTACHMENT FAILED TO RESPOND
   147                              <1> ;BAD_SEEK	EQU	040H		; SEEK OPERATION FAILED
   148                              <1> BAD_NEC 	EQU	020H		; DISKETTE CONTROLLER HAS FAILED
   149                              <1> BAD_CRC 	EQU	010H		; BAD CRC ON DISKETTE READ
   150                              <1> MED_NOT_FND	EQU	00CH		; MEDIA TYPE NOT FOUND
   151                              <1> DMA_BOUNDARY	EQU	009H		; ATTEMPT TO DMA ACROSS 64K BOUNDARY
   152                              <1> BAD_DMA 	EQU	008H		; DMA OVERRUN ON OPERATION
   153                              <1> MEDIA_CHANGE	EQU	006H		; MEDIA REMOVED ON DUAL ATTACH CARD
   154                              <1> RECORD_NOT_FND	EQU	004H		; REQUESTED SECTOR NOT FOUND
   155                              <1> WRITE_PROTECT	EQU	003H		; WRITE ATTEMPTED ON WRITE PROTECT DISK
   156                              <1> BAD_ADDR_MARK	EQU	002H		; ADDRESS MARK NOT FOUND
   157                              <1> BAD_CMD 	EQU	001H		; BAD COMMAND PASSED TO DISKETTE I/O
   158                              <1> 
   159                              <1> ;---------- DISK CHANGE LINE EQUATES -------------------------------------------
   160                              <1> NOCHGLN 	EQU	001H		; NO DISK CHANGE LINE AVAILABLE
   161                              <1> CHGLN		EQU	002H		; DISK CHANGE LINE AVAILABLE
   162                              <1> 
   163                              <1> ;---------- MEDIA/DRIVE STATE INDICATORS ---------------------------------------
   164                              <1> TRK_CAPA	EQU	00000001B	; 80 TRACK CAPABILITY
   165                              <1> FMT_CAPA	EQU	00000010B	; MULTIPLE FORMAT CAPABILITY (1.2M)
   166                              <1> DRV_DET 	EQU	00000100B	; DRIVE DETERMINED
   167                              <1> MED_DET 	EQU	00010000B	; MEDIA DETERMINED BIT
   168                              <1> DBL_STEP	EQU	00100000B	; DOUBLE STEP BIT
   169                              <1> RATE_MSK	EQU	11000000B	; MASK FOR CLEARING ALL BUT RATE
   170                              <1> RATE_500	EQU	00000000B	; 500 KBS DATA RATE
   171                              <1> RATE_300	EQU	01000000B	; 300 KBS DATA RATE
   172                              <1> RATE_250	EQU	10000000B	; 250 KBS DATA RATE
   173                              <1> STRT_MSK	EQU	00001100B	; OPERATION START RATE MASK
   174                              <1> SEND_MSK	EQU	11000000B	; MASK FOR SEND RATE BITS
   175                              <1> 
   176                              <1> ;---------- MEDIA/DRIVE STATE INDICATORS COMPATIBILITY -------------------------
   177                              <1> M3D3U		EQU	00000000B	; 360 MEDIA/DRIVE NOT ESTABLISHED
   178                              <1> M3D1U		EQU	00000001B	; 360 MEDIA,1.2DRIVE NOT ESTABLISHED
   179                              <1> M1D1U		EQU	00000010B	; 1.2 MEDIA/DRIVE NOT ESTABLISHED
   180                              <1> MED_UNK 	EQU	00000111B	; NONE OF THE ABOVE
   181                              <1> 
   182                              <1> ;---------- INTERRUPT EQUATES --------------------------------------------------
   183                              <1> ;EOI		EQU	020H		; END OF INTERRUPT COMMAND TO 8259
   184                              <1> ;INTA00		EQU	020H		; 8259 PORT
   185                              <1> INTA01		EQU	021H		; 8259 PORT
   186                              <1> INTB00		EQU	0A0H		; 2ND 8259
   187                              <1> INTB01		EQU	0A1H		;
   188                              <1> 
   189                              <1> ;-------------------------------------------------------------------------------
   190                              <1> DMA08		EQU	008H		; DMA STATUS REGISTER PORT ADDRESS
   191                              <1> DMA		EQU	000H		; DMA CH.0 ADDRESS REGISTER PORT ADDRESS
   192                              <1> DMA18		EQU	0D0H		; 2ND DMA STATUS PORT ADDRESS
   193                              <1> DMA1		EQU	0C0H		; 2ND DMA CH.0 ADDRESS REGISTER ADDRESS
   194                              <1> ;-------------------------------------------------------------------------------
   195                              <1> ;TIMER		EQU	040H		; 8254 TIMER - BASE ADDRESS
   196                              <1> 
   197                              <1> ;-------------------------------------------------------------------------------
   198                              <1> DMA_PAGE	EQU	081H		; START OF DMA PAGE REGISTERS
   199                              <1> 
   200                              <1> ; 06/02/2015 (unix386.s, protected mode modifications)
   201                              <1> ; (unix386.s <-- dsectrm2.s)
   202                              <1> ; 11/12/2014 (copy from IBM PC-XT Model 286 BIOS - DSEG.INC)
   203                              <1> 
   204                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
   205                              <1> ; 10/12/2014
   206                              <1> ;
   207                              <1> ;int40h:
   208                              <1> ;	pushf
   209                              <1> ;	push 	cs
   210                              <1> ;	;cli
   211                              <1> ;	call 	DISKETTE_IO_1
   212                              <1> ;	retn
   213                              <1> 
   214                              <1> ; DSKETTE ----- 04/21/86 DISKETTE BIOS
   215                              <1> ; (IBM PC XT Model 286 System BIOS Source Code, 04-21-86)
   216                              <1> ;
   217                              <1> 
   218                              <1> ;-- INT13H ---------------------------------------------------------------------
   219                              <1> ; DISKETTE I/O
   220                              <1> ;	THIS INTERFACE PROVIDES ACCESS TO THE 5 1/4 INCH 360 KB,
   221                              <1> ;	1.2 MB, 720 KB AND 1.44 MB DISKETTE DRIVES.
   222                              <1> ; INPUT
   223                              <1> ;	(AH) =  00H RESET DISKETTE SYSTEM
   224                              <1> ;		HARD RESET TO NEC, PREPARE COMMAND, RECALIBRATE REQUIRED
   225                              <1> ;		ON ALL DRIVES
   226                              <1> ;------------------------------------------------------------------------------- 
   227                              <1> ;	(AH)= 01H  READ THE STATUS OF THE SYSTEM INTO (AH)
   228                              <1> ;		@DISKETTE_STATUS FROM LAST OPERATION IS USED
   229                              <1> ;-------------------------------------------------------------------------------
   230                              <1> ;	REGISTERS FOR READ/WRITE/VERIFY/FORMAT
   231                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   232                              <1> ;	(DH) - HEAD NUMBER (0-1 ALLOWED, NOT VALUE CHECKED)
   233                              <1> ;	(CH) - TRACK NUMBER (NOT VALUE CHECKED)
   234                              <1> ;		MEDIA	DRIVE	TRACK NUMBER
   235                              <1> ;		320/360	320/360	    0-39
   236                              <1> ;		320/360	1.2M	    0-39
   237                              <1> ;		1.2M	1.2M	    0-79
   238                              <1> ;		720K	720K	    0-79
   239                              <1> ;		1.44M	1.44M	    0-79	
   240                              <1> ;	(CL) - 	SECTOR NUMBER (NOT VALUE CHECKED, NOT USED FOR FORMAT)
   241                              <1> ;		MEDIA	DRIVE	SECTOR NUMBER
   242                              <1> ;		320/360	320/360	     1-8/9
   243                              <1> ;		320/360	1.2M	     1-8/9
   244                              <1> ;		1.2M	1.2M	     1-15
   245                              <1> ;		720K	720K	     1-9
   246                              <1> ;		1.44M	1.44M	     1-18		
   247                              <1> ;	(AL)	NUMBER OF SECTORS (NOT VALUE CHECKED)
   248                              <1> ;		MEDIA	DRIVE	MAX NUMBER OF SECTORS
   249                              <1> ;		320/360	320/360	        8/9
   250                              <1> ;		320/360	1.2M	        8/9
   251                              <1> ;		1.2M	1.2M		15
   252                              <1> ;		720K	720K		9
   253                              <1> ;		1.44M	1.44M		18
   254                              <1> ;
   255                              <1> ;	(ES:BX) - ADDRESS OF BUFFER (NOT REQUIRED FOR VERIFY)
   256                              <1> ;
   257                              <1> ;-------------------------------------------------------------------------------
   258                              <1> ;	(AH)= 02H  READ THE DESIRED SECTORS INTO MEMORY
   259                              <1> ;-------------------------------------------------------------------------------
   260                              <1> ;	(AH)= 03H  WRITE THE DESIRED SECTORS FROM MEMORY
   261                              <1> ;-------------------------------------------------------------------------------
   262                              <1> ;	(AH)= 04H  VERIFY THE DESIRED SECTORS
   263                              <1> ;-------------------------------------------------------------------------------
   264                              <1> ;	(AH)= 05H  FORMAT THE DESIRED TRACK
   265                              <1> ;		(ES,BX) MUST POINT TO THE COLLECTION OF DESIRED ADDRESS FIELDS
   266                              <1> ;		FOR THE	TRACK. EACH FIELD IS COMPOSED OF 4 BYTES, (C,H,R,N),
   267                              <1> ;		WHERE C = TRACK NUMBER, H=HEAD NUMBER, R = SECTOR NUMBER, 
   268                              <1> ;		N= NUMBER OF BYTES PER SECTOR (00=128,01=256,02=512,03=1024),
   269                              <1> ;		THERE MUST BE ONE ENTRY FOR EVERY SECTOR ON THE TRACK.
   270                              <1> ;		THIS INFORMATION IS USED TO FIND THE REQUESTED SECTOR DURING 
   271                              <1> ;		READ/WRITE ACCESS.
   272                              <1> ;		PRIOR TO FORMATTING A DISKETTE, IF THERE EXISTS MORE THAN
   273                              <1> ;		ONE SUPPORTED MEDIA FORMAT TYPE WITHIN THE DRIVE IN QUESTION,
   274                              <1> ;		THEN "SET DASD TYPE" (INT 13H, AH = 17H) OR 'SET MEDIA TYPE'
   275                              <1> ;		(INT 13H, AH =  18H) MUST BE CALLED TO SET THE DISKETTE TYPE
   276                              <1> ;		THAT IS TO BE FORMATTED. IF "SET DASD TYPE" OR "SET MEDIA TYPE"
   277                              <1> ;		IS NOT CALLED, THE FORMAT ROUTINE WILL ASSUME THE 
   278                              <1> ;		MEDIA FORMAT TO BE THE MAXIMUM CAPACITY OF THE DRIVE.
   279                              <1> ;
   280                              <1> ;		THESE PARAMETERS OF DISK BASE MUST BE CHANGED IN ORDER TO
   281                              <1> ;		FORMAT THE FOLLOWING MEDIAS:
   282                              <1> ;		---------------------------------------------
   283                              <1> ;		: MEDIA  :     DRIVE      : PARM 1 : PARM 2 :
   284                              <1> ;		---------------------------------------------
   285                              <1> ;		: 320K	 : 320K/360K/1.2M :  50H   :   8    :
   286                              <1> ;		: 360K	 : 320K/360K/1.2M :  50H   :   9    :
   287                              <1> ;		: 1.2M	 : 1.2M           :  54H   :  15    :
   288                              <1> ;		: 720K	 : 720K/1.44M     :  50H   :   9    :
   289                              <1> ;		: 1.44M	 : 1.44M          :  6CH   :  18    :		  	
   290                              <1> ;		---------------------------------------------
   291                              <1> ;		NOTES: - PARM 1 = GAP LENGTH FOR FORMAT
   292                              <1> ;		       - PARM 2 = EOT (LAST SECTOR ON TRACK)
   293                              <1> ;		       - DISK BASE IS POINTED BY DISK POINTER LOCATED
   294                              <1> ;			 AT ABSOLUTE ADDRESS 0:78.
   295                              <1> ;		       - WHEN FORMAT OPERATIONS ARE COMPLETE, THE PARAMETERS
   296                              <1> ;			 SHOULD BE RESTORED TO THEIR RESPECTIVE INITIAL VALUES.			
   297                              <1> ;-------------------------------------------------------------------------------
   298                              <1> ;	(AH) = 08H READ DRIVE PARAMETERS
   299                              <1> ;	REGISTERS
   300                              <1> ;	  INPUT
   301                              <1> ;	    (DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   302                              <1> ;	     ** 27/05/2016 - TRDOS 386 (TRDOS v2.0) **	
   303                              <1> ;            ** EBX = Buffer address for floppy disk parameters table **
   304                              <1> ;	  OUTPUT
   305                              <1> ;	    (ES:DI) POINTS TO DRIVE PARAMETER TABLE
   306                              <1> ; 	    *** TRDOS 386 note: floppy disk parameter table (16 bytes)
   307                              <1> ;	    will be returned to user in EBX, buffer address *** 27/05/2016 ***		
   308                              <1> ;					
   309                              <1> ;	    (CH) - LOW ORDER 8 OF 10 BITS MAXIMUM NUMBER OF TRACKS
   310                              <1> ;	    (CL) - BITS 7 & 6 - HIGH ORDER TWO BITS OF MAXIMUM TRACKS
   311                              <1> ;	           BITS 5 THRU 0 - MAXIMUM SECTORS PER TRACK
   312                              <1> ;	    (DH) - MAXIMUM HEAD NUMBER
   313                              <1> ;	    (DL) - NUMBER OF DISKETTE DRIVES INSTALLED
   314                              <1> ;	    (BH) - 0
   315                              <1> ;	    (BL) - BITS 7 THRU 4 - 0
   316                              <1> ;	           BITS 3 THRU 0 - VALID DRIVE TYPE VALUE IN CMOS
   317                              <1> ;	    (AX) - 0
   318                              <1> ;	 UNDER THE FOLLOWING CIRCUMSTANCES:
   319                              <1> ;	    (1) THE DRIVE NUMBER IS INVALID,
   320                              <1> ;	    (2) THE DRIVE TYPE IS UNKNOWN AND CMOS IS NOT PRESENT, 
   321                              <1> ;	    (3) THE DRIVE TYPE IS UNKNOWN AND CMOS IS BAD,
   322                              <1> ;	    (4) OR THE DRIVE TYPE IS UNKNOWN AND THE CMOS DRIVE TYPE IS INVALID
   323                              <1> ;	    THEN ES,AX,BX,CX,DH,DI=0 ; DL=NUMBER OF DRIVES. 
   324                              <1> ;	    IF NO DRIVES ARE PRESENT THEN: ES,AX,BX,CX,DX,DI=0.
   325                              <1> ;	    @DISKETTE_STATUS = 0 AND CY IS RESET.
   326                              <1> ;-------------------------------------------------------------------------------
   327                              <1> ;	(AH)= 15H  READ DASD TYPE
   328                              <1> ;	OUTPUT REGISTERS
   329                              <1> ;	(AH) - ON RETURN IF CARRY FLAG NOT SET, OTHERWISE ERROR	
   330                              <1> ;		00 - DRIVE NOT PRESENT	
   331                              <1> ;		01 - DISKETTE, NO CHANGE LINE AVAILABLE
   332                              <1> ;		02 - DISKETTE, CHANGE LINE AVAILABLE	
   333                              <1> ;		03 - RESERVED (FIXED DISK)
   334                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   335                              <1> ;-------------------------------------------------------------------------------
   336                              <1> ;	(AH)= 16H  DISK CHANGE LINE STATUS
   337                              <1> ;	OUTPUT REGISTERS
   338                              <1> ;	(AH) - 00 - DISK CHANGE LINE NOT ACTIVE	
   339                              <1> ;	       06 - DISK CHANGE LINE ACTIVE & CARRY BIT ON
   340                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   341                              <1> ;-------------------------------------------------------------------------------
   342                              <1> ;	(AH)= 17H  SET DASD TYPE FOR FORMAT
   343                              <1> ;	INPUT REGISTERS
   344                              <1> ;	(AL) -	00 - NOT USED	
   345                              <1> ;		01 - DISKETTE 320/360K IN 360K DRIVE	
   346                              <1> ;		02 - DISKETTE 360K IN 1.2M DRIVE
   347                              <1> ;		03 - DISKETTE 1.2M IN 1.2M DRIVE
   348                              <1> ;		04 - DISKETTE 720K IN 720K DRIVE
   349                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED:
   350                              <1> ;	       (DO NOT USE WHEN DISKETTE ATTACH CARD USED)
   351                              <1> ;-------------------------------------------------------------------------------
   352                              <1> ;	(AH)= 18H  SET MEDIA TYPE FOR FORMAT
   353                              <1> ;	INPUT REGISTERS
   354                              <1> ;	(CH) - LOW ORDER 8 OF 10 BITS MAXIMUM TRACKS
   355                              <1> ;	(CL) - BITS 7 & 6 - HIGH ORDER TWO BITS OF MAXIMUM TRACKS
   356                              <1> ;	       BITS 5 THRU 0 - MAXIMUM SECTORS PER TRACK
   357                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHACKED)
   358                              <1> ;	OUTPUT REGISTERS:
   359                              <1> ;	(ES:DI) - POINTER TO DRIVE PARAMETERS TABLE FOR THIS MEDIA TYPE,
   360                              <1> ;		  UNCHANGED IF (AH) IS NON-ZERO
   361                              <1> ;	(AH) - 00H, CY = 0, TRACK AND SECTORS/TRACK COMBINATION IS SUPPORTED
   362                              <1> ;	     - 01H, CY = 1, FUNCTION IS NOT AVAILABLE
   363                              <1> ;	     - 0CH, CY = 1, TRACK AND SECTORS/TRACK COMBINATION IS NOT SUPPORTED
   364                              <1> ;	     - 80H, CY = 1, TIME OUT (DISKETTE NOT PRESENT)		
   365                              <1> ;-------------------------------------------------------------------------------
   366                              <1> ;	DISK CHANGE STATUS IS ONLY CHECKED WHEN A MEDIA SPECIFIED IS OTHER
   367                              <1> ;	THAN 360 KB DRIVE. IF THE DISK CHANGE LINE IS FOUND TO BE
   368                              <1> ;	ACTIVE THE FOLLOWING ACTIONS TAKE PLACE:
   369                              <1> ;		ATTEMPT TO RESET DISK CHANGE LINE TO INACTIVE STATE. 
   370                              <1> ;		IF ATTEMPT SUCCEEDS SET DASD TYPE FOR FORMAT AND RETURN DISK 
   371                              <1> ;		CHANGE ERROR CODE
   372                              <1> ;		IF ATTEMPT FAILS RETURN TIMEOUT ERROR CODE AND SET DASD TYPE 
   373                              <1> ;		TO A PREDETERMINED STATE INDICATING MEDIA TYPE UNKNOWN.
   374                              <1> ;	IF THE DISK CHANGE LINE IN INACTIVE PERFORM SET DASD TYPE FOR FORMAT.
   375                              <1> ;
   376                              <1> ; DATA VARIABLE -- @DISK_POINTER
   377                              <1> ;	DOUBLE WORD POINTER TO THE CURRENT SET OF DISKETTE PARAMETERS
   378                              <1> ;-------------------------------------------------------------------------------
   379                              <1> ; OUTPUT FOR ALL FUNCTIONS
   380                              <1> ;	AH = STATUS OF OPERATION
   381                              <1> ;		STATUS BITS ARE DEFINED IN THE EQUATES FOR @DISKETTE_STATUS
   382                              <1> ;		VARIABLE IN THE DATA SEGMENT OF THIS MODULE
   383                              <1> ;	CY = 0	SUCCESSFUL OPERATION (AH=0 ON RETURN, EXCEPT FOR READ DASD
   384                              <1> ;		TYPE AH=(15)).
   385                              <1> ;	CY = 1	FAILED OPERATION (AH HAS ERROR REASON)
   386                              <1> ;	FOR READ/WRITE/VERIFY
   387                              <1> ;		DS,BX,DX,CX PRESERVED
   388                              <1> ;	NOTE: IF AN ERROR IS REPORTED BY THE DISKETTE CODE, THE APPROPRIATE 
   389                              <1> ;		ACTION IS TO RESET THE DISKETTE, THEN RETRY THE OPERATION.
   390                              <1> ;		ON READ ACCESSES, NO MOTOR START DELAY IS TAKEN, SO THAT 
   391                              <1> ;		THREE RETRIES ARE REQUIRED ON READS TO ENSURE THAT THE 
   392                              <1> ;		PROBLEM IS NOT DUE TO MOTOR START-UP.
   393                              <1> ;-------------------------------------------------------------------------------
   394                              <1> ;
   395                              <1> ; DISKETTE STATE MACHINE - ABSOLUTE ADDRESS 40:90 (DRIVE A) & 91 (DRIVE B)
   396                              <1> ;
   397                              <1> ;   -----------------------------------------------------------------
   398                              <1> ;   |       |       |       |       |       |       |       |       |
   399                              <1> ;   |   7   |   6   |   5   |   4   |   3   |   2   |   1   |   0   |
   400                              <1> ;   |       |       |       |       |       |       |       |       |
   401                              <1> ;   -----------------------------------------------------------------
   402                              <1> ;	|	|	|	|	|	|	|	|
   403                              <1> ;	|	|	|	|	|	-----------------
   404                              <1> ;	|	|	|	|	|		|
   405                              <1> ;	|	|	|	|    RESERVED		|
   406                              <1> ;	|	|	|	|		  PRESENT STATE
   407                              <1> ;	|	|	|	|	000: 360K IN 360K DRIVE UNESTABLISHED
   408                              <1> ;	|	|	|	|	001: 360K IN 1.2M DRIVE UNESTABLISHED
   409                              <1> ;	|	|	|	|	010: 1.2M IN 1.2M DRIVE UNESTABLISHED
   410                              <1> ;	|	|	|	|	011: 360K IN 360K DRIVE ESTABLISHED
   411                              <1> ;	|	|	|	|	100: 360K IN 1.2M DRIVE ESTABLISHED
   412                              <1> ;	|	|	|	|	101: 1.2M IN 1.2M DRIVE ESTABLISHED
   413                              <1> ;	|	|	|	|	110: RESERVED
   414                              <1> ;	|	|	|	|	111: NONE OF THE ABOVE
   415                              <1> ;	|	|	|	|
   416                              <1> ;	|	|	|	------>	MEDIA/DRIVE ESTABLISHED
   417                              <1> ;	|	|	|
   418                              <1> ;	|	|	-------------->	DOUBLE STEPPING REQUIRED (360K IN 1.2M
   419                              <1> ;	|	|			DRIVE)
   420                              <1> ;	|	|
   421                              <1> ;	------------------------------>	DATA TRANSFER RATE FOR THIS DRIVE:
   422                              <1> ;
   423                              <1> ;						00: 500 KBS
   424                              <1> ;						01: 300 KBS
   425                              <1> ;						10: 250 KBS
   426                              <1> ;						11: RESERVED
   427                              <1> ;
   428                              <1> ;
   429                              <1> ;-------------------------------------------------------------------------------
   430                              <1> ; STATE OPERATION STARTED - ABSOLUTE ADDRESS 40:92 (DRIVE A) & 93 (DRIVE B)
   431                              <1> ;-------------------------------------------------------------------------------
   432                              <1> ; PRESENT CYLINDER NUMBER - ABSOLUTE ADDRESS 40:94 (DRIVE A) & 95 (DRIVE B)
   433                              <1> ;-------------------------------------------------------------------------------
   434                              <1> 
   435                              <1> struc MD
   436 00000000 <res 00000001>      <1> 	.SPEC1		resb	1	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   437 00000001 <res 00000001>      <1> 	.SPEC2		resb	1	; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   438 00000002 <res 00000001>      <1> 	.OFF_TIM	resb	1	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   439 00000003 <res 00000001>      <1> 	.BYT_SEC	resb	1	; 512 BYTES/SECTOR
   440 00000004 <res 00000001>      <1> 	.SEC_TRK	resb	1	; EOT (LAST SECTOR ON TRACK)
   441 00000005 <res 00000001>      <1> 	.GAP		resb	1	; GAP LENGTH
   442 00000006 <res 00000001>      <1> 	.DTL		resb	1	; DTL
   443 00000007 <res 00000001>      <1> 	.GAP3		resb	1	; GAP LENGTH FOR FORMAT
   444 00000008 <res 00000001>      <1> 	.FIL_BYT	resb	1	; FILL BYTE FOR FORMAT
   445 00000009 <res 00000001>      <1> 	.HD_TIM		resb	1	; HEAD SETTLE TIME (MILLISECONDS)
   446 0000000A <res 00000001>      <1> 	.STR_TIM	resb	1	; MOTOR START TIME (1/8 SECONDS)
   447 0000000B <res 00000001>      <1> 	.MAX_TRK	resb	1	; MAX. TRACK NUMBER
   448 0000000C <res 00000001>      <1> 	.RATE		resb	1	; DATA TRANSFER RATE
   449                              <1> endstruc
   450                              <1> 
   451                              <1> BIT7OFF	EQU	7FH
   452                              <1> BIT7ON	EQU	80H
   453                              <1> 
   454                              <1> ; 30/08/2020 - TRDOS 386 v2
   455                              <1> 
   456                              <1> ;;int13h: ; 16/02/2015
   457                              <1> ;; 16/02/2015 - 21/02/2015
   458                              <1> int40h:
   459 0000436F 9C                  <1> 	pushfd
   460 00004370 0E                  <1> 	push 	cs
   461 00004371 E801000000          <1> 	call 	DISKETTE_IO_1
   462 00004376 C3                  <1> 	retn	
   463                              <1> 
   464                              <1> DISKETTE_IO_1:
   465                              <1> 
   466 00004377 FB                  <1> 	STI				; INTERRUPTS BACK ON
   467 00004378 55                  <1> 	PUSH	eBP			; USER REGISTER
   468 00004379 57                  <1> 	PUSH	eDI			; USER REGISTER
   469 0000437A 52                  <1> 	PUSH	eDX			; HEAD #, DRIVE # OR USER REGISTER
   470 0000437B 53                  <1> 	PUSH	eBX			; BUFFER OFFSET PARAMETER OR REGISTER
   471 0000437C 51                  <1> 	PUSH	eCX			; TRACK #-SECTOR # OR USER REGISTER
   472 0000437D 89E5                <1> 	MOV	eBP,eSP			; BP     => PARAMETER LIST DEP. ON AH
   473                              <1> 					; [BP]   = SECTOR #
   474                              <1> 					; [BP+1] = TRACK #
   475                              <1> 					; [BP+2] = BUFFER OFFSET
   476                              <1> 					; FOR RETURN OF DRIVE PARAMETERS:
   477                              <1> 					; CL/[BP] = BITS 7&6 HI BITS OF MAX CYL
   478                              <1> 					; 	    BITS 0-5 MAX SECTORS/TRACK
   479                              <1> 					; CH/[BP+1] = LOW 8 BITS OF MAX CYL.
   480                              <1> 					; BL/[BP+2] = BITS 7-4 = 0
   481                              <1> 					;	      BITS 3-0 = VALID CMOS TYPE
   482                              <1> 					; BH/[BP+3] = 0
   483                              <1> 					; DL/[BP+4] = # DRIVES INSTALLED
   484                              <1> 					; DH/[BP+5] = MAX HEAD #
   485                              <1> 					; DI/[BP+6] = OFFSET TO DISK BASE
   486 0000437F 06                  <1> 	push	es ; 06/02/2015	
   487 00004380 1E                  <1> 	PUSH	DS			; BUFFER SEGMENT PARM OR USER REGISTER
   488 00004381 56                  <1> 	PUSH	eSI			; USER REGISTERS
   489                              <1> 	;CALL	DDS			; SEGMENT OF BIOS DATA AREA TO DS
   490                              <1> 	;mov	cx, cs
   491                              <1> 	;mov	ds, cx
   492 00004382 66B91000            <1> 	mov	cx, KDATA
   493 00004386 8ED9                <1>         mov     ds, cx
   494 00004388 8EC1                <1>         mov     es, cx
   495                              <1> 
   496                              <1> 	;CMP	AH,(FNC_TAE-FNC_TAB)/2	; CHECK FOR > LARGEST FUNCTION
   497 0000438A 80FC19              <1> 	cmp	ah,(FNC_TAE-FNC_TAB)/4  ; 18/02/2015
   498 0000438D 7202                <1> 	JB	short OK_FUNC		; FUNCTION OK
   499 0000438F B414                <1> 	MOV	AH,14H			; REPLACE WITH KNOWN INVALID FUNCTION
   500                              <1> OK_FUNC:
   501 00004391 80FC01              <1> 	CMP	AH,1			; RESET OR STATUS ?
   502 00004394 760C                <1> 	JBE	short OK_DRV		; IF RESET OR STATUS DRIVE ALWAYS OK
   503 00004396 80FC08              <1> 	CMP	AH,8			; READ DRIVE PARMS ?
   504 00004399 7407                <1> 	JZ	short OK_DRV		; IF SO DRIVE CHECKED LATER
   505 0000439B 80FA01              <1> 	CMP	DL,1			; DRIVES 0 AND 1 OK
   506 0000439E 7602                <1> 	JBE	short OK_DRV		; IF 0 OR 1 THEN JUMP
   507 000043A0 B414                <1> 	MOV	AH,14H			; REPLACE WITH KNOWN INVALID FUNCTION
   508                              <1> OK_DRV:
   509 000043A2 31C9                <1> 	xor	ecx, ecx
   510                              <1> 	;mov	esi, ecx ; 08/02/2015
   511 000043A4 89CF                <1> 	mov	edi, ecx ; 08/02/2015
   512 000043A6 88E1                <1> 	MOV	CL,AH			; CL = FUNCTION
   513                              <1> 	;XOR	CH,CH			; CX = FUNCTION
   514                              <1> 	;SHL	CL, 1			; FUNCTION TIMES 2
   515 000043A8 C0E102              <1> 	SHL	CL, 2 ; 20/02/2015	; FUNCTION TIMES 4 (for 32 bit offset)
   516 000043AB BB[E3430000]        <1> 	MOV	eBX,FNC_TAB		; LOAD START OF FUNCTION TABLE
   517 000043B0 01CB                <1> 	ADD	eBX,eCX			; ADD OFFSET INTO TABLE => ROUTINE
   518 000043B2 88F4                <1> 	MOV	AH,DH			; AX = HEAD #,# OF SECTORS OR DASD TYPE
   519 000043B4 30F6                <1> 	XOR	DH,DH			; DX = DRIVE #
   520 000043B6 6689C6              <1> 	MOV	SI,AX			; SI = HEAD #,# OF SECTORS OR DASD TYPE
   521 000043B9 6689D7              <1> 	MOV     DI,DX                   ; DI = DRIVE #
   522                              <1> 	;
   523                              <1> 	; 11/12/2014
   524 000043BC 8815[DD6D0000]      <1>         mov     [cfd], dl               ; current floppy drive (for 'GET_PARM')        
   525                              <1> 	;
   526 000043C2 8A25[18820100]      <1> 	MOV	AH, [DSKETTE_STATUS]	; LOAD STATUS TO AH FOR STATUS FUNCTION
   527 000043C8 C605[18820100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; INITIALIZE FOR ALL OTHERS
   528                              <1> 
   529                              <1> ;	THROUGHOUT THE DISKETTE BIOS, THE FOLLOWING INFORMATION IS CONTAINED IN
   530                              <1> ;	THE FOLLOWING MEMORY LOCATIONS AND REGISTERS. NOT ALL DISKETTE BIOS
   531                              <1> ;	FUNCTIONS REQUIRE ALL OF THESE PARAMETERS.
   532                              <1> ;
   533                              <1> ;		DI	: DRIVE #
   534                              <1> ;		SI-HI	: HEAD #
   535                              <1> ;		SI-LOW	: # OF SECTORS OR DASD TYPE FOR FORMAT
   536                              <1> ;		ES	: BUFFER SEGMENT
   537                              <1> ;		[BP]	: SECTOR #
   538                              <1> ;		[BP+1]	: TRACK #
   539                              <1> ;		[BP+2]	: BUFFER OFFSET
   540                              <1> ;
   541                              <1> ;	ACROSS CALLS TO SUBROUTINES THE CARRY FLAG (CY=1), WHERE INDICATED IN 
   542                              <1> ;	SUBROUTINE PROLOGUES, REPRESENTS AN EXCEPTION RETURN (NORMALLY AN ERROR 
   543                              <1> ;	CONDITION). IN MOST CASES, WHEN CY = 1, @DSKETTE_STATUS CONTAINS THE 
   544                              <1> ;	SPECIFIC ERROR CODE.
   545                              <1> ;
   546                              <1> 					; (AH) = @DSKETTE_STATUS
   547 000043CF FF13                <1> 	CALL	dWORD [eBX]		; CALL THE REQUESTED FUNCTION
   548 000043D1 5E                  <1> 	POP	eSI			; RESTORE ALL REGISTERS
   549 000043D2 1F                  <1> 	POP	DS
   550 000043D3 07                  <1> 	pop	es	; 06/02/2015
   551 000043D4 59                  <1> 	POP	eCX
   552 000043D5 5B                  <1> 	POP	eBX
   553 000043D6 5A                  <1> 	POP	eDX
   554 000043D7 5F                  <1> 	POP	eDI
   555 000043D8 89E5                <1> 	MOV	eBP, eSP
   556 000043DA 50                  <1> 	PUSH	eAX
   557 000043DB 9C                  <1> 	PUSHFd
   558 000043DC 58                  <1> 	POP	eAX
   559                              <1> 	;MOV	[BP+6], AX
   560 000043DD 89450C              <1> 	mov	[ebp+12], eax  ; 18/02/2015, flags
   561 000043E0 58                  <1> 	POP	eAX
   562 000043E1 5D                  <1> 	POP	eBP
   563 000043E2 CF                  <1> 	IRETd
   564                              <1> 
   565                              <1> ;-------------------------------------------------------------------------------
   566                              <1> ; DW --> dd (06/02/2015)
   567 000043E3 [47440000]          <1> FNC_TAB	dd	DSK_RESET		; AH = 00H; RESET
   568 000043E7 [C0440000]          <1> 	dd	DSK_STATUS		; AH = 01H; STATUS
   569 000043EB [D1440000]          <1> 	dd	DSK_READ		; AH = 02H; READ
   570 000043EF [E2440000]          <1> 	dd	DSK_WRITE		; AH = 03H; WRITE
   571 000043F3 [F3440000]          <1> 	dd	DSK_VERF		; AH = 04H; VERIFY
   572 000043F7 [04450000]          <1> 	dd	DSK_FORMAT		; AH = 05H; FORMAT
   573 000043FB [89450000]          <1> 	dd	FNC_ERR			; AH = 06H; INVALID
   574 000043FF [89450000]          <1> 	dd	FNC_ERR			; AH = 07H; INVALID
   575 00004403 [96450000]          <1> 	dd	DSK_PARMS		; AH = 08H; READ DRIVE PARAMETERS
   576 00004407 [89450000]          <1> 	dd	FNC_ERR			; AH = 09H; INVALID
   577 0000440B [89450000]          <1> 	dd	FNC_ERR			; AH = 0AH; INVALID
   578 0000440F [89450000]          <1> 	dd	FNC_ERR			; AH = 0BH; INVALID
   579 00004413 [89450000]          <1> 	dd	FNC_ERR			; AH = 0CH; INVALID
   580 00004417 [89450000]          <1> 	dd	FNC_ERR			; AH = 0DH; INVALID
   581 0000441B [89450000]          <1> 	dd	FNC_ERR			; AH = 0EH; INVALID
   582 0000441F [89450000]          <1> 	dd	FNC_ERR			; AH = 0FH; INVALID
   583 00004423 [89450000]          <1> 	dd	FNC_ERR			; AH = 10H; INVALID
   584 00004427 [89450000]          <1> 	dd	FNC_ERR			; AH = 11H; INVALID
   585 0000442B [89450000]          <1> 	dd	FNC_ERR			; AH = 12H; INVALID
   586 0000442F [89450000]          <1> 	dd	FNC_ERR			; AH = 13H; INVALID
   587 00004433 [89450000]          <1> 	dd	FNC_ERR			; AH = 14H; INVALID
   588 00004437 [86460000]          <1> 	dd	DSK_TYPE		; AH = 15H; READ DASD TYPE
   589 0000443B [B6460000]          <1> 	dd	DSK_CHANGE		; AH = 16H; CHANGE STATUS
   590 0000443F [F0460000]          <1> 	dd	FORMAT_SET		; AH = 17H; SET DASD TYPE
   591 00004443 [73470000]          <1> 	dd	SET_MEDIA		; AH = 18H; SET MEDIA TYPE	
   592                              <1> FNC_TAE EQU     $                       ; END
   593                              <1> 
   594                              <1> ;-------------------------------------------------------------------------------
   595                              <1> ; DISK_RESET	(AH = 00H)	
   596                              <1> ;		RESET THE DISKETTE SYSTEM.
   597                              <1> ;
   598                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   599                              <1> ;-------------------------------------------------------------------------------
   600                              <1> DSK_RESET:
   601 00004447 66BAF203            <1> 	MOV	DX,03F2H		; ADAPTER CONTROL PORT
   602 0000444B FA                  <1> 	CLI				; NO INTERRUPTS
   603 0000444C A0[16820100]        <1> 	MOV	AL,[MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
   604 00004451 243F                <1> 	AND	AL,00111111B		; KEEP SELECTED AND MOTOR ON BITS
   605 00004453 C0C004              <1> 	ROL	AL,4			; MOTOR VALUE TO HIGH NIBBLE
   606                              <1> 					; DRIVE SELECT TO LOW NIBBLE
   607 00004456 0C08                <1> 	OR	AL,00001000B		; TURN ON INTERRUPT ENABLE
   608 00004458 EE                  <1> 	OUT	DX,AL			; RESET THE ADAPTER
   609 00004459 C605[15820100]00    <1> 	MOV	byte [SEEK_STATUS],0	; SET RECALIBRATE REQUIRED ON ALL DRIVES
   610                              <1> 	;JMP	$+2			; WAIT FOR I/O
   611                              <1> 	;JMP	$+2			; WAIT FOR I/O (TO INSURE MINIMUM
   612                              <1> 					;      PULSE WIDTH)
   613                              <1> 	; 19/12/2014
   614                              <1> 	NEWIODELAY
   614 00004460 E6EB                <2>  out 0ebh,al
   615                              <1> 
   616                              <1> 	; 17/12/2014 
   617                              <1> 	; AWARD BIOS 1999 - RESETDRIVES (ADISK.ASM)
   618 00004462 B915000000          <1> 	mov	ecx, WAITCPU_RESET_ON	; cx = 21 -- Min. 14 micro seconds !?
   619                              <1> wdw1:
   620                              <1> 	NEWIODELAY   ; 27/02/2015
   620 00004467 E6EB                <2>  out 0ebh,al
   621 00004469 E2FC                <1> 	loop	wdw1
   622                              <1> 	;
   623 0000446B 0C04                <1> 	OR	AL,00000100B		; TURN OFF RESET BIT
   624 0000446D EE                  <1> 	OUT	DX,AL			; RESET THE ADAPTER
   625                              <1> 	; 16/12/2014
   626                              <1> 	IODELAY
   626 0000446E EB00                <2>  jmp short $+2
   626 00004470 EB00                <2>  jmp short $+2
   627                              <1> 	;
   628                              <1> 	;STI				; ENABLE THE INTERRUPTS
   629 00004472 E8590C0000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
   630 00004477 723E                <1> 	JC	short DR_ERR		; IF ERROR, RETURN IT
   631 00004479 66B9C000            <1> 	MOV	CX,11000000B		; CL = EXPECTED @NEC_STATUS
   632                              <1> NXT_DRV:
   633 0000447D 6651                <1> 	PUSH	CX			; SAVE FOR CALL
   634 0000447F B8[B5440000]        <1> 	MOV	eAX, DR_POP_ERR 	; LOAD NEC_OUTPUT ERROR ADDRESS
   635 00004484 50                  <1> 	PUSH	eAX			; "
   636 00004485 B408                <1> 	MOV	AH,08H			; SENSE INTERRUPT STATUS COMMAND
   637 00004487 E8370B0000          <1> 	CALL	NEC_OUTPUT
   638 0000448C 58                  <1> 	POP	eAX			; THROW AWAY ERROR RETURN
   639 0000448D E86E0C0000          <1> 	CALL	RESULTS			; READ IN THE RESULTS
   640 00004492 6659                <1> 	POP	CX			; RESTORE AFTER CALL
   641 00004494 7221                <1> 	JC	short DR_ERR		; ERROR RETURN
   642 00004496 3A0D[19820100]      <1> 	CMP	CL, [NEC_STATUS]	; TEST FOR DRIVE READY TRANSITION
   643 0000449C 7519                <1> 	JNZ	short DR_ERR		; EVERYTHING OK
   644 0000449E FEC1                <1> 	INC	CL			; NEXT EXPECTED @NEC_STATUS
   645 000044A0 80F9C3              <1> 	CMP	CL,11000011B		; ALL POSSIBLE DRIVES CLEARED
   646 000044A3 76D8                <1> 	JBE	short NXT_DRV		; FALL THRU IF 11000100B OR >
   647                              <1> 	;
   648 000044A5 E886030000          <1> 	CALL	SEND_SPEC		; SEND SPECIFY COMMAND TO NEC
   649                              <1> RESBAC:
   650 000044AA E83A090000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   651 000044AF 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   652 000044B2 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   653 000044B4 C3                  <1> 	RETn		
   654                              <1> DR_POP_ERR:
   655 000044B5 6659                <1> 	POP	CX			; CLEAR STACK
   656                              <1> DR_ERR:
   657 000044B7 800D[18820100]20    <1> 	OR	byte [DSKETTE_STATUS],BAD_NEC ; SET ERROR CODE
   658 000044BE EBEA                <1> 	JMP	SHORT RESBAC		; RETURN FROM RESET
   659                              <1> 
   660                              <1> ;-------------------------------------------------------------------------------
   661                              <1> ; DISK_STATUS	(AH = 01H)
   662                              <1> ;	DISKETTE STATUS.
   663                              <1> ;
   664                              <1> ; ON ENTRY:	AH : STATUS OF PREVIOUS OPERATION
   665                              <1> ;
   666                              <1> ; ON EXIT:	AH, @DSKETTE_STATUS, CY REFLECT STATUS OF PREVIOUS OPERATION.
   667                              <1> ;-------------------------------------------------------------------------------
   668                              <1> DSK_STATUS:
   669 000044C0 8825[18820100]      <1> 	MOV	[DSKETTE_STATUS],AH	; PUT BACK FOR SETUP END
   670 000044C6 E81E090000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   671 000044CB 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   672 000044CE 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   673 000044D0 C3                  <1> 	RETn		
   674                              <1> 
   675                              <1> ;-------------------------------------------------------------------------------
   676                              <1> ; DISK_READ	(AH = 02H)	
   677                              <1> ;	DISKETTE READ.
   678                              <1> ;
   679                              <1> ; ON ENTRY:	DI	: DRIVE #
   680                              <1> ;		SI-HI	: HEAD #
   681                              <1> ;		SI-LOW	: # OF SECTORS
   682                              <1> ;		ES	: BUFFER SEGMENT
   683                              <1> ;		[BP]	: SECTOR #
   684                              <1> ;		[BP+1]	: TRACK #
   685                              <1> ;		[BP+2]	: BUFFER OFFSET
   686                              <1> ;
   687                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   688                              <1> ;-------------------------------------------------------------------------------
   689                              <1> 
   690                              <1> ; 06/02/2015, ES:BX -> EBX (unix386.s)
   691                              <1> 
   692                              <1> DSK_READ:
   693 000044D1 8025[16820100]7F    <1> 	AND	byte [MOTOR_STATUS],01111111B ; INDICATE A READ OPERATION
   694 000044D8 66B846E6            <1> 	MOV	AX,0E646H		; AX = NEC COMMAND, DMA COMMAND
   695 000044DC E859040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   696 000044E1 C3                  <1> 	RETn
   697                              <1> 
   698                              <1> ;-------------------------------------------------------------------------------
   699                              <1> ; DISK_WRITE	(AH = 03H)
   700                              <1> ;	DISKETTE WRITE.
   701                              <1> ;
   702                              <1> ; ON ENTRY:	DI	: DRIVE #
   703                              <1> ;		SI-HI	: HEAD #
   704                              <1> ;		SI-LOW	: # OF SECTORS
   705                              <1> ;		ES	: BUFFER SEGMENT
   706                              <1> ;		[BP]	: SECTOR #
   707                              <1> ;		[BP+1]	: TRACK #
   708                              <1> ;		[BP+2]	: BUFFER OFFSET
   709                              <1> ;
   710                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   711                              <1> ;-------------------------------------------------------------------------------
   712                              <1> 
   713                              <1> ; 06/02/2015, ES:BX -> EBX (unix386.s)
   714                              <1> 
   715                              <1> DSK_WRITE:
   716 000044E2 66B84AC5            <1> 	MOV	AX,0C54AH		; AX = NEC COMMAND, DMA COMMAND
   717 000044E6 800D[16820100]80    <1>         OR      byte [MOTOR_STATUS],10000000B ; INDICATE WRITE OPERATION
   718 000044ED E848040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   719 000044F2 C3                  <1> 	RETn
   720                              <1> 
   721                              <1> ;-------------------------------------------------------------------------------
   722                              <1> ; DISK_VERF	(AH = 04H)
   723                              <1> ;	DISKETTE VERIFY.
   724                              <1> ;
   725                              <1> ; ON ENTRY:	DI	: DRIVE #
   726                              <1> ;		SI-HI	: HEAD #
   727                              <1> ;		SI-LOW	: # OF SECTORS
   728                              <1> ;		ES	: BUFFER SEGMENT
   729                              <1> ;		[BP]	: SECTOR #
   730                              <1> ;		[BP+1]	: TRACK #
   731                              <1> ;		[BP+2]	: BUFFER OFFSET
   732                              <1> ;
   733                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   734                              <1> ;-------------------------------------------------------------------------------
   735                              <1> DSK_VERF:
   736 000044F3 8025[16820100]7F    <1> 	AND	byte [MOTOR_STATUS],01111111B ; INDICATE A READ OPERATION
   737 000044FA 66B842E6            <1> 	MOV	AX,0E642H		; AX = NEC COMMAND, DMA COMMAND
   738 000044FE E837040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   739 00004503 C3                  <1> 	RETn
   740                              <1> 
   741                              <1> ;-------------------------------------------------------------------------------
   742                              <1> ; DISK_FORMAT	(AH = 05H)
   743                              <1> ;	DISKETTE FORMAT.
   744                              <1> ;
   745                              <1> ; ON ENTRY:	DI	: DRIVE #
   746                              <1> ;		SI-HI	: HEAD #
   747                              <1> ;		SI-LOW	: # OF SECTORS
   748                              <1> ;		ES	: BUFFER SEGMENT
   749                              <1> ;		[BP]	: SECTOR #
   750                              <1> ;		[BP+1]	: TRACK #
   751                              <1> ;		[BP+2]	: BUFFER OFFSET
   752                              <1> ;		@DISK_POINTER POINTS TO THE PARAMETER TABLE OF THIS DRIVE
   753                              <1> ;
   754                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   755                              <1> ;-------------------------------------------------------------------------------
   756                              <1> DSK_FORMAT:
   757 00004504 E870030000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
   758 00004509 E86C050000          <1> 	CALL	FMT_INIT		; ESTABLISH STATE IF UNESTABLISHED
   759 0000450E 800D[16820100]80    <1>         OR      byte [MOTOR_STATUS], 10000000B ; INDICATE WRITE OPERATION
   760 00004515 E8B4050000          <1> 	CALL	MED_CHANGE		; CHECK MEDIA CHANGE AND RESET IF SO
   761 0000451A 725D                <1>         JC      short FM_DON            ; MEDIA CHANGED, SKIP
   762 0000451C E80F030000          <1> 	CALL	SEND_SPEC		; SEND SPECIFY COMMAND TO NEC
   763 00004521 E81A060000          <1> 	CALL	CHK_LASTRATE		; ZF=1 ATTEMPT RATE IS SAME AS LAST RATE
   764 00004526 7405                <1>         JZ      short FM_WR             ; YES, SKIP SPECIFY COMMAND
   765 00004528 E8F1050000          <1> 	CALL	SEND_RATE		; SEND DATA RATE TO CONTROLLER
   766                              <1> FM_WR:
   767 0000452D E8A7060000          <1> 	CALL	FMTDMA_SET		; SET UP THE DMA FOR FORMAT
   768 00004532 7245                <1>         JC      short FM_DON            ; RETURN WITH ERROR
   769 00004534 B44D                <1> 	MOV	AH,04DH			; ESTABLISH THE FORMAT COMMAND
   770 00004536 E804070000          <1> 	CALL	NEC_INIT		; INITIALIZE THE NEC
   771 0000453B 723C                <1>         JC      short FM_DON            ; ERROR - EXIT
   772 0000453D B8[79450000]        <1>         MOV     eAX, FM_DON             ; LOAD ERROR ADDRESS
   773 00004542 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
   774 00004543 B203                <1> 	MOV	DL,3			; BYTES/SECTOR VALUE TO NEC
   775 00004545 E873090000          <1> 	CALL	GET_PARM
   776 0000454A E8740A0000          <1> 	CALL	NEC_OUTPUT
   777 0000454F B204                <1> 	MOV	DL,4			; SECTORS/TRACK VALUE TO NEC
   778 00004551 E867090000          <1> 	CALL	GET_PARM
   779 00004556 E8680A0000          <1> 	CALL	NEC_OUTPUT
   780 0000455B B207                <1> 	MOV	DL,7			; GAP LENGTH VALUE TO NEC
   781 0000455D E85B090000          <1> 	CALL	GET_PARM
   782 00004562 E85C0A0000          <1> 	CALL	NEC_OUTPUT
   783 00004567 B208                <1> 	MOV	DL,8			; FILLER BYTE TO NEC
   784 00004569 E84F090000          <1> 	CALL	GET_PARM
   785 0000456E E8500A0000          <1> 	CALL	NEC_OUTPUT
   786 00004573 58                  <1> 	POP	eAX			; THROW AWAY ERROR
   787 00004574 E844070000          <1> 	CALL	NEC_TERM		; TERMINATE, RECEIVE STATUS, ETC,
   788                              <1> FM_DON:
   789 00004579 E82C030000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
   790 0000457E E866080000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   791 00004583 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   792 00004586 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   793 00004588 C3                  <1> 	RETn
   794                              <1> 
   795                              <1> ;-------------------------------------------------------------------------------
   796                              <1> ; FNC_ERR
   797                              <1> ;	INVALID FUNCTION REQUESTED OR INVALID DRIVE: 
   798                              <1> ;	SET BAD COMMAND IN STATUS.
   799                              <1> ;
   800                              <1> ; ON EXIT: 	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   801                              <1> ;-------------------------------------------------------------------------------
   802                              <1> FNC_ERR:				; INVALID FUNCTION REQUEST
   803 00004589 6689F0              <1> 	MOV	AX,SI			; RESTORE AL
   804 0000458C B401                <1> 	MOV	AH,BAD_CMD		; SET BAD COMMAND ERROR
   805 0000458E 8825[18820100]      <1> 	MOV	[DSKETTE_STATUS],AH	; STORE IN DATA AREA
   806 00004594 F9                  <1> 	STC				; SET CARRY INDICATING ERROR
   807 00004595 C3                  <1> 	RETn
   808                              <1> 
   809                              <1> ; 30/08/2020
   810                              <1> ; 29/08/2020
   811                              <1> ; 01/06/2016
   812                              <1> ; 28/05/2016
   813                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v.2.0)
   814                              <1> ;-------------------------------------------------------------------------------
   815                              <1> ; DISK_PARMS	(AH = 08H)	
   816                              <1> ;	READ DRIVE PARAMETERS.
   817                              <1> ;
   818                              <1> ; ON ENTRY:	DI : DRIVE #
   819                              <1> ;		; 27/05/2016
   820                              <1> ;		EBX = Buffer Address for floppy disk parameters table (16 bytes)
   821                              <1> ;
   822                              <1> ; ON EXIT:	CL/[BP]   = BITS 7 & 6 HI 2 BITS OF MAX CYLINDER
   823                              <1> ;		            BITS 0-5 MAX SECTORS/TRACK
   824                              <1> ;		CH/[BP+1] = LOW 8 BITS OF MAX CYLINDER
   825                              <1> ;		BL/[BP+2] = BITS 7-4 = 0
   826                              <1> ;		            BITS 3-0 = VALID CMOS DRIVE TYPE
   827                              <1> ;		BH/[BP+3] = 0
   828                              <1> ;		DL/[BP+4] = # DRIVES INSTALLED (VALUE CHECKED)
   829                              <1> ;		DH/[BP+5] = MAX HEAD #
   830                              <1> ;	     ** 27/05/2016 - TRDOS 386 (TRDOS v2.0) **	
   831                              <1> ;            ** EBX = Buffer address for floppy disk parameters table **
   832                              <1> ;		;DI/[BP+6] = OFFSET TO DISK_BASE
   833                              <1> ;		;ES        = SEGMENT OF DISK_BASE
   834                              <1> ;
   835                              <1> ;		AX        = 0
   836                              <1> ;
   837                              <1> ;		NOTE : THE ABOVE INFORMATION IS STORED IN THE USERS STACK AT
   838                              <1> ;		       THE LOCATIONS WHERE THE MAIN ROUTINE WILL POP THEM
   839                              <1> ;		       INTO THE APPROPRIATE REGISTERS BEFORE RETURNING TO THE
   840                              <1> ;		       CALLER.
   841                              <1> ;-------------------------------------------------------------------------------
   842                              <1> DSK_PARMS:
   843 00004596 E8DE020000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH,
   844                              <1>      ;	MOV	WORD [BP+2],0		; DRIVE TYPE = 0
   845                              <1>      ;  MOV     AX, [EQUIP_FLAG]        ; LOAD EQUIPMENT FLAG FOR # DISKETTES
   846                              <1>      ;  AND     AL,11000001B            ; KEEP DISKETTE DRIVE BITS
   847                              <1>      ;  MOV     DL,2                    ; DISKETTE DRIVES = 2
   848                              <1>      ;  CMP     AL,01000001B            ; 2 DRIVES INSTALLED ?
   849                              <1>      ;  JZ      short STO_DL            ; IF YES JUMP
   850                              <1>      ;  DEC     DL                      ; DISKETTE DRIVES = 1
   851                              <1>      ;  CMP     AL,00000001B            ; 1 DRIVE INSTALLED ?
   852                              <1>      ;  JNZ     short NON_DRV           ; IF NO JUMP
   853 0000459B 29D2                <1> 	sub	edx, edx
   854 0000459D 66A1[EE6D0000]      <1> 	mov     ax, [fd0_type]
   855 000045A3 6621C0              <1> 	and     ax, ax
   856 000045A6 0F849B000000        <1>         jz      NON_DRV
   857 000045AC FEC2                <1> 	inc     dl
   858 000045AE 20E4                <1> 	and     ah, ah
   859 000045B0 7402                <1> 	jz      short STO_DL
   860 000045B2 FEC2                <1> 	inc     dl
   861                              <1> STO_DL:
   862                              <1> 	; 30/08/2020
   863 000045B4 6639FA              <1> 	cmp	dx, di
   864 000045B7 0F868A000000        <1> 	jna	NON_DRV
   865                              <1> 	;
   866                              <1> 	;MOV	[BP+4],DL		; STORE NUMBER OF DRIVES
   867 000045BD 895508              <1> 	mov	[ebp+8], edx ; 20/02/2015	 	
   868 000045C0 6683FF01            <1> 	CMP	DI,1			; CHECK FOR VALID DRIVE
   869                              <1> 	;JA	short NON_DRV1		; DRIVE INVALID
   870 000045C4 0F8780000000        <1> 	ja	NON_DRV1 ; 29/08/2020
   871                              <1> 	;MOV	BYTE [BP+5],1		; MAXIMUM HEAD NUMBER =	1
   872 000045CA C6450901            <1> 	mov	byte [ebp+9], 1  ; 20/02/2015	
   873 000045CE E8E1080000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN AL
   874                              <1> 	;;20/02/2015
   875                              <1> 	;;JC	short CHK_EST		; IF CMOS BAD CHECKSUM ESTABLISHED
   876                              <1> 	;;OR	AL,AL			; TEST FOR NO DRIVE TYPE
   877 000045D3 740F                <1> 	JZ	short CHK_EST		; JUMP IF SO
   878 000045D5 E82B020000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   879 000045DA 7208                <1> 	JC	short CHK_EST		; TYPE NOT IN TABLE (POSSIBLE BAD CMOS)
   880                              <1> 	;MOV	[BP+2],AL		; STORE VALID CMOS DRIVE TYPE
   881                              <1>         ;mov	[ebp+4], al ; 06/02/2015
   882 000045DC 8A4B04              <1> 	MOV     CL, [eBX+MD.SEC_TRK]     ; GET SECTOR/TRACK
   883 000045DF 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]     ; GET MAX. TRACK NUMBER
   884 000045E2 EB36                <1> 	JMP	SHORT STO_CX		; CMOS GOOD, USE CMOS
   885                              <1> CHK_EST:
   886 000045E4 8AA7[25820100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; LOAD STATE FOR THIS DRIVE
   887 000045EA F6C410              <1> 	TEST	AH,MED_DET		; CHECK FOR ESTABLISHED STATE
   888 000045ED 745B                <1> 	JZ	short NON_DRV1		; CMOS BAD/INVALID OR UNESTABLISHED
   889                              <1> USE_EST:
   890 000045EF 80E4C0              <1> 	AND	AH,RATE_MSK		; ISOLATE STATE
   891 000045F2 80FC80              <1> 	CMP	AH,RATE_250		; RATE 250 ?
   892 000045F5 757B                <1> 	JNE	short USE_EST2		; NO, GO CHECK OTHER RATE
   893                              <1> 
   894                              <1> ;-----	DATA RATE IS 250 KBS, TRY 360 KB TABLE FIRST
   895                              <1> 
   896 000045F7 B001                <1> 	MOV	AL,01			; DRIVE TYPE 1 (360KB)
   897 000045F9 E807020000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   898 000045FE 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   899 00004601 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   900 00004604 F687[25820100]01    <1> 	TEST	byte [DSK_STATE+eDI],TRK_CAPA ; 80 TRACK ?
   901 0000460B 740D                <1> 	JZ	short STO_CX		; MUST BE 360KB DRIVE 
   902                              <1> 
   903                              <1> ;-----	IT IS 1.44 MB DRIVE
   904                              <1> 
   905                              <1> PARM144:
   906 0000460D B004                <1> 	MOV	AL,04			; DRIVE TYPE 4 (1.44MB)
   907 0000460F E8F1010000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   908 00004614 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   909 00004617 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   910                              <1> STO_CX:
   911 0000461A 894D00              <1> 	MOV	[eBP],eCX		; SAVE POINTER IN STACK FOR RETURN
   912                              <1> ES_DI:
   913                              <1> 	;MOV	[BP+6],BX		; ADDRESS OF MEDIA/DRIVE PARM TABLE 
   914                              <1> 	;mov	[ebp+12], ebx ; 06/02/2015
   915                              <1> 	;MOV	AX,CS			; SEGMENT MEDIA/DRIVE PARAMETER TABLE
   916                              <1> 	;MOV	ES,AX			; ES IS SEGMENT OF TABLE
   917                              <1> 	;
   918                              <1> 	; 28/05/2016
   919                              <1> 	; 27/05/2016
   920                              <1> 	; return floppy disk parameters table to user
   921                              <1> 	; in user's buffer, which is pointed by EBX
   922                              <1> 	;
   923 0000461D 57                  <1> 	push	edi
   924 0000461E 8B7D04              <1> 	mov	edi, [ebp+4]  		; ebx (input), user's buffer address
   925                              <1> 	; 29/08/2020
   926 00004621 09FF                <1> 	or	edi, edi
   927 00004623 7417                <1> 	jz	short no_copy_fdpt
   928                              <1> 	;
   929 00004625 0FB6C0              <1> 	movzx	eax, al
   930 00004628 894504              <1>         mov	[ebp+4], eax   ; ebx	; drive type (for floppy drives)
   931                              <1> 	; 01/06/2016 (INT 33h, disk type return for floppy disks, in BL)
   932 0000462B A3[1C8E0100]        <1> 	mov	[user_buffer], eax	; 01/06/2016 (overwrite ebx return value)
   933                              <1> 	;(INT 33h, Function 08h will replace user's buffer addr with disk type!)
   934                              <1> 	;
   935 00004630 89DE                <1> 	mov	esi, ebx 		; floppy disk parameter table (16 bytes)
   936 00004632 B910000000          <1> 	mov	ecx, 16 ; 16 bytes
   937 00004637 E888CC0000          <1>         call    transfer_to_user_buffer ; trdosk6.s (16/05/2016)
   938                              <1> no_copy_fdpt:
   939 0000463C 5F                  <1> 	pop	edi	
   940                              <1> DP_OUT:
   941 0000463D E868020000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
   942 00004642 6631C0              <1> 	XOR	AX,AX			; CLEAR
   943 00004645 F8                  <1> 	CLC
   944 00004646 C3                  <1> 	RETn
   945                              <1> 
   946                              <1> ;-----	NO DRIYE PRESENT HANDLER
   947                              <1> 
   948                              <1> NON_DRV:
   949                              <1> 	;MOV	BYTE [BP+4],0		; CLEAR NUMBER OF DRIVES
   950 00004647 895508              <1> 	mov	[ebp+8], edx ; 0 ; 20/02/2015
   951                              <1> NON_DRV1:
   952 0000464A 6681FF8000          <1> 	CMP	DI,80H			; CHECK FOR FIXED MEDIA TYPE REQUEST
   953 0000464F 720C                <1> 	JB	short NON_DRV2		; CONTINUE IF NOT REQUEST FALL THROUGH
   954                              <1> 
   955                              <1> ;-----	FIXED DISK REQUEST FALL THROUGH ERROR
   956                              <1> 	
   957 00004651 E854020000          <1> 	CALL	XLAT_OLD		; ELSE TRANSLATE TO COMPATIBLE MODE
   958 00004656 6689F0              <1> 	MOV	AX,SI			; RESTORE AL
   959 00004659 B401                <1> 	MOV	AH,BAD_CMD		; SET BAD COMMAND ERROR
   960 0000465B F9                  <1> 	STC
   961 0000465C C3                  <1> 	RETn
   962                              <1> 
   963                              <1> NON_DRV2:
   964                              <1> 	;XOR	AX,AX			; CLEAR PARMS IF NO DRIVES OR CMOS BAD
   965 0000465D 31C0                <1> 	xor	eax, eax	
   966 0000465F 66894500            <1> 	MOV	[eBP],AX		; TRACKS, SECTORS/TRACK = 0
   967                              <1> 	;MOV	[BP+5],AH		; HEAD = 0
   968 00004663 886509              <1> 	mov	[ebp+9], ah ; 06/02/2015
   969                              <1> 	;MOV	[BP+6],AX		; OFFSET TO DISK_BASE = 0
   970 00004666 89450C              <1> 	mov	[ebp+12], eax
   971                              <1> 	;;MOV	ES,AX			; ES IS SEGMENT OF TABLE
   972                              <1> 	;JMP	SHORT DP_OUT
   973                              <1> 
   974                              <1> 	; 30/08/2020
   975 00004669 E83C020000          <1> 	call	XLAT_OLD
   976                              <1> 	;mov	ah, NOT_RDY ; drive not ready
   977 0000466E B407                <1> 	mov	ah, INIT_FAIL ; DRIVE PARAMETER ACTIVITY FAILED 
   978 00004670 F9                  <1> 	stc	; cf -> 1, ah = 'drive not ready' error code
   979 00004671 C3                  <1> 	retn		
   980                              <1> 
   981                              <1> ;-----	DATA RATE IS EITHER 300 KBS OR 500 KBS, TRY 1.2 MB TABLE FIRST
   982                              <1> 
   983                              <1> USE_EST2:
   984 00004672 B002                <1> 	MOV	AL,02			; DRIVE TYPE 2 (1.2MB)
   985 00004674 E88C010000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   986 00004679 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   987 0000467C 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   988 0000467F 80FC40              <1> 	CMP	AH,RATE_300		; RATE 300 ?
   989 00004682 7496                <1> 	JZ	short STO_CX		; MUST BE 1.2MB DRIVE
   990 00004684 EB87                <1> 	JMP	SHORT PARM144		; ELSE, IT IS 1.44MB DRIVE 
   991                              <1> 
   992                              <1> ; 30/08/2020
   993                              <1> 
   994                              <1> ;-------------------------------------------------------------------------------
   995                              <1> ; DISK_TYPE (AH = 15H)	
   996                              <1> ;	THIS ROUTINE RETURNS THE TYPE OF MEDIA INSTALLED.
   997                              <1> ;
   998                              <1> ;  ON ENTRY:	DI = DRIVE #
   999                              <1> ;
  1000                              <1> ;  ON EXIT:	AH = DRIVE TYPE, CY=0
  1001                              <1> ;-------------------------------------------------------------------------------
  1002                              <1> DSK_TYPE:
  1003 00004686 E8EE010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1004 0000468B 8A87[25820100]      <1> 	MOV	AL,[DSK_STATE+eDI]	; GET PRESENT STATE INFORMATION
  1005 00004691 08C0                <1> 	OR	AL,AL			; CHECK FOR NO DRIVE
  1006 00004693 7418                <1> 	JZ	short NO_DRV
  1007 00004695 B401                <1> 	MOV	AH,NOCHGLN		; NO CHANGE LINE FOR 40 TRACK DRIVE
  1008 00004697 A801                <1> 	TEST	AL,TRK_CAPA		; IS THIS DRIVE AN 80 TRACK DRIVE?
  1009 00004699 7402                <1> 	JZ	short DT_BACK		; IF NO JUMP
  1010 0000469B B402                <1> 	MOV	AH,CHGLN		; CHANGE LINE FOR 80 TRACK DRIVE
  1011                              <1> DT_BACK:
  1012 0000469D 6650                <1> 	PUSH	AX			; SAVE RETURN VALUE
  1013 0000469F E806020000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1014 000046A4 6658                <1> 	POP	AX			; RESTORE RETURN VALUE
  1015 000046A6 F8                  <1> 	CLC				; NO ERROR
  1016 000046A7 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
  1017 000046AA 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
  1018 000046AC C3                  <1> 	RETn
  1019                              <1> NO_DRV:	
  1020                              <1> 	;XOR	AH,AH			; NO DRIVE PRESENT OR UNKNOWN
  1021                              <1> 	;JMP	SHORT DT_BACK
  1022                              <1> 	
  1023                              <1> 	; 30/08/2020
  1024 000046AD E8F8010000          <1> 	call	XLAT_OLD
  1025 000046B2 29C0                <1> 	sub	eax, eax
  1026 000046B4 F9                  <1> 	stc	; cf = 1 -> drive not ready, ah = 0 (disk type = 0)
  1027 000046B5 C3                  <1> 	retn
  1028                              <1> 
  1029                              <1> ;-------------------------------------------------------------------------------
  1030                              <1> ; DISK_CHANGE	(AH = 16H)
  1031                              <1> ;	THIS ROUTINE RETURNS THE STATE OF THE DISK CHANGE LINE.
  1032                              <1> ;
  1033                              <1> ; ON ENTRY:	DI = DRIVE #
  1034                              <1> ;
  1035                              <1> ; ON EXIT:	AH = @DSKETTE_STATUS
  1036                              <1> ;		     00 - DISK CHANGE LINE INACTIVE, CY = 0
  1037                              <1> ;		     06 - DISK CHANGE LINE ACTIVE, CY = 1
  1038                              <1> ;-------------------------------------------------------------------------------
  1039                              <1> DSK_CHANGE:
  1040 000046B6 E8BE010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1041 000046BB 8A87[25820100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET MEDIA STATE INFORMATION
  1042 000046C1 08C0                <1> 	OR	AL,AL			; DRIVE PRESENT ?
  1043 000046C3 7422                <1> 	JZ	short DC_NON		; JUMP IF NO DRIVE
  1044 000046C5 A801                <1> 	TEST	AL,TRK_CAPA		; 80 TRACK DRIVE ?
  1045 000046C7 7407                <1> 	JZ	short SETIT		; IF SO , CHECK CHANGE LINE
  1046                              <1> DC0:
  1047 000046C9 E88D0A0000          <1>         CALL    READ_DSKCHNG            ; GO CHECK STATE OF DISK CHANGE LINE
  1048 000046CE 7407                <1> 	JZ	short FINIS		; CHANGE LINE NOT ACTIVE
  1049                              <1> 
  1050 000046D0 C605[18820100]06    <1> SETIT:	MOV	byte [DSKETTE_STATUS], MEDIA_CHANGE ; INDICATE MEDIA REMOVED
  1051                              <1> 
  1052 000046D7 E8CE010000          <1> FINIS:	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1053 000046DC E808070000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1054 000046E1 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
  1055 000046E4 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
  1056 000046E6 C3                  <1> 	RETn
  1057                              <1> DC_NON:
  1058 000046E7 800D[18820100]80    <1> 	OR	byte [DSKETTE_STATUS], TIME_OUT ; SET TIMEOUT, NO DRIVE
  1059 000046EE EBE7                <1> 	JMP	SHORT FINIS
  1060                              <1> 
  1061                              <1> ;-------------------------------------------------------------------------------
  1062                              <1> ; FORMAT_SET	(AH = 17H)
  1063                              <1> ;	THIS ROUTINE IS USED TO ESTABLISH THE TYPE OF MEDIA TO BE USED
  1064                              <1> ;	FOR THE FOLLOWING FORMAT OPERATION.
  1065                              <1> ;
  1066                              <1> ; ON ENTRY:	SI LOW = DASD TYPE FOR FORMAT
  1067                              <1> ;		DI     = DRIVE #
  1068                              <1> ;
  1069                              <1> ; ON EXIT:	@DSKETTE_STATUS REFLECTS STATUS
  1070                              <1> ;		AH = @DSKETTE_STATUS
  1071                              <1> ;		CY = 1 IF ERROR
  1072                              <1> ;-------------------------------------------------------------------------------
  1073                              <1> FORMAT_SET:
  1074 000046F0 E884010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1075 000046F5 6656                <1> 	PUSH	SI			; SAVE DASD TYPE
  1076 000046F7 6689F0              <1> 	MOV	AX,SI			; AH = ? , AL , DASD TYPE
  1077 000046FA 30E4                <1> 	XOR	AH,AH			; AH , 0 , AL , DASD TYPE
  1078 000046FC 6689C6              <1> 	MOV	SI,AX			; SI = DASD TYPE
  1079 000046FF 80A7[25820100]0F    <1> 	AND	byte [DSK_STATE+eDI], ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR STATE
  1080 00004706 664E                <1> 	DEC	SI			; CHECK FOR 320/360K MEDIA & DRIVE
  1081 00004708 7509                <1> 	JNZ	short NOT_320		; BYPASS IF NOT
  1082 0000470A 808F[25820100]90    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+RATE_250 ; SET TO 320/360
  1083 00004711 EB48                <1> 	JMP	SHORT S0
  1084                              <1> 
  1085                              <1> NOT_320:
  1086 00004713 E8B6030000          <1> 	CALL	MED_CHANGE		; CHECK FOR TIME_OUT
  1087 00004718 803D[18820100]80    <1> 	CMP	byte [DSKETTE_STATUS], TIME_OUT
  1088 0000471F 743A                <1> 	JZ	short S0		; IF TIME OUT TELL CALLER
  1089                              <1> S3:
  1090 00004721 664E                <1> 	DEC	SI			; CHECK FOR 320/360K IN 1.2M DRIVE
  1091 00004723 7509                <1> 	JNZ	short NOT_320_12	; BYPASS IF NOT
  1092 00004725 808F[25820100]70    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+DBL_STEP+RATE_300 ; SET STATE
  1093 0000472C EB2D                <1> 	JMP	SHORT S0
  1094                              <1> 
  1095                              <1> NOT_320_12:
  1096 0000472E 664E                <1> 	DEC	SI			; CHECK FOR 1.2M MEDIA IN 1.2M DRIVE
  1097 00004730 7509                <1> 	JNZ	short NOT_12		; BYPASS IF NOT
  1098 00004732 808F[25820100]10    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+RATE_500 ; SET STATE VARIABLE
  1099 00004739 EB20                <1> 	JMP	SHORT S0		; RETURN TO CALLER
  1100                              <1> 
  1101                              <1> NOT_12:	
  1102 0000473B 664E                <1> 	DEC	SI			; CHECK FOR SET DASD TYPE 04
  1103 0000473D 752B                <1> 	JNZ	short FS_ERR		; BAD COMMAND EXIT IF NOT VALID TYPE
  1104                              <1> 
  1105 0000473F F687[25820100]04    <1> 	TEST	byte [DSK_STATE+eDI], DRV_DET ; DRIVE DETERMINED ?
  1106 00004746 740B                <1> 	JZ	short ASSUME		; IF STILL NOT DETERMINED ASSUME
  1107 00004748 B050                <1> 	MOV	AL,MED_DET+RATE_300
  1108 0000474A F687[25820100]02    <1>         TEST    byte [DSK_STATE+eDI], FMT_CAPA ; MULTIPLE FORMAT CAPABILITY ?
  1109 00004751 7502                <1> 	JNZ	short OR_IT_IN		; IF 1.2 M THEN DATA RATE 300
  1110                              <1> 
  1111                              <1> ASSUME:
  1112 00004753 B090                <1> 	MOV	AL,MED_DET+RATE_250	; SET UP
  1113                              <1> 
  1114                              <1> OR_IT_IN:
  1115 00004755 0887[25820100]      <1> 	OR	[DSK_STATE+eDI], AL	; OR IN THE CORRECT STATE
  1116                              <1> S0:
  1117 0000475B E84A010000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1118 00004760 E884060000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1119 00004765 665B                <1> 	POP	BX			; GET SAVED AL TO BL
  1120 00004767 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
  1121 00004769 C3                  <1> 	RETn
  1122                              <1> 
  1123                              <1> FS_ERR:
  1124 0000476A C605[18820100]01    <1> 	MOV	byte [DSKETTE_STATUS], BAD_CMD ; UNKNOWN STATE,BAD COMMAND
  1125 00004771 EBE8                <1> 	JMP	SHORT S0
  1126                              <1> 
  1127                              <1> ;-------------------------------------------------------------------------------
  1128                              <1> ; SET_MEDIA	(AH = 18H)
  1129                              <1> ;	THIS ROUTINE SETS THE TYPE OF MEDIA AND DATA RATE 
  1130                              <1> ;	TO BE USED FOR THE FOLLOWING FORMAT OPERATION.
  1131                              <1> ;
  1132                              <1> ; ON ENTRY:
  1133                              <1> ;	[BP]	= SECTOR PER TRACK
  1134                              <1> ;	[BP+1]	= TRACK #
  1135                              <1> ;	DI	= DRIVE #
  1136                              <1> ;
  1137                              <1> ; ON EXIT:
  1138                              <1> ;	@DSKETTE_STATUS REFLECTS STATUS
  1139                              <1> ;	IF NO ERROR:
  1140                              <1> ;		AH = 0
  1141                              <1> ;		CY = 0
  1142                              <1> ;		ES = SEGMENT OF MEDIA/DRIVE PARAMETER TABLE
  1143                              <1> ;		DI/[BP+6] = OFFSET OF MEDIA/DRIVE PARAMETER TABLE
  1144                              <1> ;	IF ERROR:	
  1145                              <1> ;		AH = @DSKETTE_STATUS
  1146                              <1> ;		CY = 1
  1147                              <1> ;-------------------------------------------------------------------------------
  1148                              <1> SET_MEDIA:
  1149 00004773 E801010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1150 00004778 F687[25820100]01    <1>         TEST    byte [DSK_STATE+eDI], TRK_CAPA ; CHECK FOR CHANGE LINE AVAILABLE
  1151 0000477F 7415                <1> 	JZ	short SM_CMOS		; JUMP IF 40 TRACK DRIVE
  1152 00004781 E848030000          <1> 	CALL	MED_CHANGE		; RESET CHANGE LINE
  1153 00004786 803D[18820100]80    <1> 	CMP	byte [DSKETTE_STATUS], TIME_OUT ; IF TIME OUT TELL CALLER
  1154 0000478D 746B                <1> 	JE	short SM_RTN
  1155 0000478F C605[18820100]00    <1> 	MOV	byte [DSKETTE_STATUS], 0 ; CLEAR STATUS
  1156                              <1> SM_CMOS:
  1157 00004796 E819070000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN (AL)
  1158                              <1> 	;;20/02/2015
  1159                              <1> 	;;JC	short MD_NOT_FND	; ERROR IN CMOS
  1160                              <1> 	;;OR	AL,AL			; TEST FOR NO DRIVE
  1161 0000479B 745D                <1> 	JZ	short SM_RTN		; RETURN IF SO
  1162 0000479D E863000000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
  1163 000047A2 7231                <1> 	JC	short MD_NOT_FND	; TYPE NOT IN TABLE (BAD CMOS)
  1164 000047A4 57                  <1> 	PUSH	eDI			; SAVE REG.
  1165 000047A5 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR. TYPE TABLE
  1166 000047A7 B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1167                              <1> DR_SEARCH:
  1168 000047AC 8AA3[686D0000]      <1> 	MOV	AH, [DR_TYPE+eBX]	; GET DRIVE TYPE
  1169 000047B2 80E47F              <1> 	AND	AH,BIT7OFF		; MASK OUT MSB
  1170 000047B5 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH ?
  1171 000047B7 7516                <1> 	JNE	short NXT_MD		; NO, CHECK NEXT DRIVE TYPE
  1172                              <1> DR_FND:
  1173 000047B9 8BBB[696D0000]      <1> 	MOV	eDI, [DR_TYPE+eBX+1] 	; DI = MEDIA/DRIVE PARAM TABLE
  1174                              <1> MD_SEARCH:
  1175 000047BF 8A6704              <1>         MOV     AH, [eDI+MD.SEC_TRK]    ; GET SECTOR/TRACK
  1176 000047C2 386500              <1> 	CMP	[eBP],AH		; MATCH?
  1177 000047C5 7508                <1> 	JNE	short NXT_MD		; NO, CHECK NEXT MEDIA
  1178 000047C7 8A670B              <1>         MOV     AH, [eDI+MD.MAX_TRK]    ; GET MAX. TRACK #
  1179 000047CA 386501              <1> 	CMP 	[eBP+1],AH		; MATCH?
  1180 000047CD 740F                <1> 	JE	short MD_FND		; YES, GO GET RATE
  1181                              <1> NXT_MD:
  1182                              <1> 	;ADD	BX,3			; CHECK NEXT DRIVE TYPE
  1183 000047CF 83C305              <1>         add	ebx, 5 ; 18/02/2015
  1184 000047D2 E2D8                <1> 	LOOP    DR_SEARCH
  1185 000047D4 5F                  <1> 	POP	eDI			; RESTORE REG.
  1186                              <1> MD_NOT_FND:
  1187 000047D5 C605[18820100]0C    <1> 	MOV	byte [DSKETTE_STATUS], MED_NOT_FND ; ERROR, MEDIA TYPE NOT FOUND
  1188 000047DC EB1C                <1> 	JMP	SHORT SM_RTN		; RETURN
  1189                              <1> MD_FND:
  1190 000047DE 8A470C              <1>         MOV     AL, [eDI+MD.RATE]       ; GET RATE
  1191 000047E1 3C40                <1> 	CMP	AL,RATE_300		; DOUBLE STEP REQUIRED FOR RATE 300
  1192 000047E3 7502                <1> 	JNE	short MD_SET
  1193 000047E5 0C20                <1> 	OR	AL,DBL_STEP
  1194                              <1> MD_SET:
  1195                              <1> 	;MOV	[BP+6],DI		; SAVE TABLE POINTER IN STACK
  1196 000047E7 897D0C              <1> 	mov	[ebp+12], edi ; 18/02/2015
  1197 000047EA 0C10                <1> 	OR	AL,MED_DET		; SET MEDIA ESTABLISHED
  1198 000047EC 5F                  <1> 	POP	eDI
  1199 000047ED 80A7[25820100]0F    <1> 	AND	byte [DSK_STATE+eDI], ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR STATE
  1200 000047F4 0887[25820100]      <1> 	OR	[DSK_STATE+eDI], AL
  1201                              <1> 	;MOV	AX, CS			; SEGMENT OF MEDIA/DRIVE PARAMETER TABLE
  1202                              <1> 	;MOV	ES, AX			; ES IS SEGMENT OF TABLE
  1203                              <1> SM_RTN:
  1204 000047FA E8AB000000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1205 000047FF E8E5050000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1206 00004804 C3                  <1> 	RETn
  1207                              <1> 
  1208                              <1> ;----------------------------------------------------------------
  1209                              <1> ; DR_TYPE_CHECK							:
  1210                              <1> ;	CHECK IF THE GIVEN DRIVE TYPE IN REGISTER (AL)		:
  1211                              <1> ;	IS SUPPORTED IN BIOS DRIVE TYPE TABLE			:
  1212                              <1> ; ON ENTRY:							:
  1213                              <1> ;	AL = DRIVE TYPE						:
  1214                              <1> ; ON EXIT:							:
  1215                              <1> ;	CS = SEGMENT MEDIA/DRIVE PARAMETER TABLE (CODE)		:
  1216                              <1> ;	CY = 0 	DRIVE TYPE SUPPORTED				:
  1217                              <1> ;	     BX = OFFSET TO MEDIA/DRIVE PARAMETER TABLE		:
  1218                              <1> ;	CY = 1	DRIVE TYPE NOT SUPPORTED 			:
  1219                              <1> ; REGISTERS ALTERED: eBX						:
  1220                              <1> ;----------------------------------------------------------------		
  1221                              <1> DR_TYPE_CHECK:
  1222 00004805 6650                <1> 	PUSH	AX			
  1223 00004807 51                  <1> 	PUSH	eCX
  1224 00004808 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR_TYPE TABLE
  1225 0000480A B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1226                              <1> TYPE_CHK:	
  1227 0000480F 8AA3[686D0000]      <1> 	MOV	AH,[DR_TYPE+eBX]	; GET DRIVE TYPE
  1228 00004815 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH?
  1229 00004817 740D                <1> 	JE	short DR_TYPE_VALID	; YES, RETURN WITH CARRY RESET
  1230                              <1> 	;ADD	BX,3			; CHECK NEXT DRIVE TYPE
  1231 00004819 83C305              <1>         add	ebx, 5	; 16/02/2015 (32 bit address modification)
  1232 0000481C E2F1                <1> 	LOOP    TYPE_CHK
  1233                              <1> 	;
  1234 0000481E BB[C76D0000]        <1> 	mov	ebx, MD_TBL6		; 1.44MB fd parameter table
  1235                              <1> 					; Default for GET_PARM (11/12/2014)
  1236                              <1> 	;
  1237 00004823 F9                  <1> 	STC				; DRIVE TYPE NOT FOUND IN TABLE
  1238 00004824 EB06                <1> 	JMP	SHORT TYPE_RTN
  1239                              <1> DR_TYPE_VALID:
  1240 00004826 8B9B[696D0000]      <1> 	MOV	eBX,[DR_TYPE+eBX+1] 	; BX = MEDIA TABLE
  1241                              <1> TYPE_RTN:
  1242 0000482C 59                  <1> 	POP	eCX
  1243 0000482D 6658                <1> 	POP	AX
  1244 0000482F C3                  <1> 	RETn	
  1245                              <1> 		
  1246                              <1> ;----------------------------------------------------------------
  1247                              <1> ; SEND_SPEC							:
  1248                              <1> ;	SEND THE SPECIFY COMMAND TO CONTROLLER USING DATA FROM	:
  1249                              <1> ;	THE DRIVE PARAMETER TABLE POINTED BY @DISK_POINTER	:
  1250                              <1> ; ON ENTRY:	@DISK_POINTER = DRIVE PARAMETER TABLE		:
  1251                              <1> ; ON EXIT:	NONE						:	
  1252                              <1> ; REGISTERS ALTERED: CX, DX					:
  1253                              <1> ;----------------------------------------------------------------		
  1254                              <1> SEND_SPEC:
  1255 00004830 50                  <1> 	PUSH	eAX			; SAVE AX
  1256 00004831 B8[57480000]        <1> 	MOV	eAX, SPECBAC		; LOAD ERROR ADDRESS
  1257 00004836 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1258 00004837 B403                <1> 	MOV	AH,03H			; SPECIFY COMMAND
  1259 00004839 E885070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1260 0000483E 28D2                <1> 	SUB	DL,DL			; FIRST SPECIFY BYTE
  1261 00004840 E878060000          <1> 	CALL	GET_PARM		; GET PARAMETER TO AH
  1262 00004845 E879070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1263 0000484A B201                <1> 	MOV	DL,1			; SECOND SPECIFY BYTE
  1264 0000484C E86C060000          <1> 	CALL	GET_PARM		; GET PARAMETER TO AH
  1265 00004851 E86D070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1266 00004856 58                  <1> 	POP	eAX			; POP ERROR RETURN
  1267                              <1> SPECBAC:
  1268 00004857 58                  <1> 	POP	eAX			; RESTORE ORIGINAL AX VALUE
  1269 00004858 C3                  <1> 	RETn
  1270                              <1> 
  1271                              <1> ;----------------------------------------------------------------
  1272                              <1> ; SEND_SPEC_MD							:
  1273                              <1> ;	SEND THE SPECIFY COMMAND TO CONTROLLER USING DATA FROM	:
  1274                              <1> ;	THE MEDIA/DRIVE PARAMETER TABLE POINTED BY (CS:BX)	:
  1275                              <1> ; ON ENTRY:	CS:BX = MEDIA/DRIVE PARAMETER TABLE		:
  1276                              <1> ; ON EXIT:	NONE						:	
  1277                              <1> ; REGISTERS ALTERED: AX						:
  1278                              <1> ;----------------------------------------------------------------		
  1279                              <1> SEND_SPEC_MD:
  1280 00004859 50                  <1> 	PUSH	eAX			; SAVE RATE DATA
  1281 0000485A B8[77480000]        <1> 	MOV	eAX, SPEC_ESBAC		; LOAD ERROR ADDRESS
  1282 0000485F 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1283 00004860 B403                <1> 	MOV	AH,03H			; SPECIFY COMMAND
  1284 00004862 E85C070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1285 00004867 8A23                <1>         MOV     AH, [eBX+MD.SPEC1]      ; GET 1ST SPECIFY BYTE
  1286 00004869 E855070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1287 0000486E 8A6301              <1>         MOV     AH, [eBX+MD.SPEC2]      ; GET SECOND SPECIFY BYTE
  1288 00004871 E84D070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1289 00004876 58                  <1> 	POP	eAX			; POP ERROR RETURN
  1290                              <1> SPEC_ESBAC:
  1291 00004877 58                  <1> 	POP	eAX			; RESTORE ORIGINAL AX VALUE
  1292 00004878 C3                  <1> 	RETn
  1293                              <1> 
  1294                              <1> ;-------------------------------------------------------------------------------
  1295                              <1> ; XLAT_NEW  
  1296                              <1> ;	TRANSLATES DISKETTE STATE LOCATIONS FROM COMPATIBLE
  1297                              <1> ;	MODE TO NEW ARCHITECTURE.
  1298                              <1> ;
  1299                              <1> ; ON ENTRY:	DI = DRIVE #
  1300                              <1> ;-------------------------------------------------------------------------------
  1301                              <1> XLAT_NEW:
  1302 00004879 83FF01              <1> 	CMP	eDI,1				; VALID DRIVE
  1303 0000487C 7725                <1> 	JA	short XN_OUT			; IF INVALID BACK
  1304 0000487E 80BF[25820100]00    <1> 	CMP	byte [DSK_STATE+eDI], 0		; NO DRIVE ?
  1305 00004885 741D                <1> 	JZ	short DO_DET			; IF NO DRIVE ATTEMPT DETERMINE
  1306 00004887 6689F9              <1> 	MOV	CX,DI				; CX = DRIVE NUMBER
  1307 0000488A C0E102              <1> 	SHL	CL,2				; CL = SHIFT COUNT, A=0, B=4
  1308 0000488D A0[24820100]        <1> 	MOV	AL, [HF_CNTRL]			; DRIVE INFORMATION
  1309 00004892 D2C8                <1> 	ROR	AL,CL				; TO LOW NIBBLE
  1310 00004894 2407                <1> 	AND	AL,DRV_DET+FMT_CAPA+TRK_CAPA	; KEEP DRIVE BITS
  1311 00004896 80A7[25820100]F8    <1>         AND     byte [DSK_STATE+eDI], ~(DRV_DET+FMT_CAPA+TRK_CAPA)
  1312 0000489D 0887[25820100]      <1> 	OR	[DSK_STATE+eDI], AL		; UPDATE DRIVE STATE
  1313                              <1> XN_OUT:
  1314 000048A3 C3                  <1> 	RETn
  1315                              <1> DO_DET:
  1316 000048A4 E8BF080000          <1> 	CALL	DRIVE_DET			; TRY TO DETERMINE
  1317 000048A9 C3                  <1> 	RETn
  1318                              <1> 
  1319                              <1> ;-------------------------------------------------------------------------------
  1320                              <1> ; XLAT_OLD 
  1321                              <1> ;	TRANSLATES DISKETTE STATE LOCATIONS FROM NEW
  1322                              <1> ;	ARCHITECTURE TO COMPATIBLE MODE.
  1323                              <1> ;
  1324                              <1> ; ON ENTRY:	DI = DRIVE
  1325                              <1> ;-------------------------------------------------------------------------------
  1326                              <1> XLAT_OLD:
  1327 000048AA 83FF01              <1> 	CMP	eDI,1			; VALID DRIVE ?
  1328                              <1>         ;JA     short XO_OUT            ; IF INVALID BACK
  1329 000048AD 0F8786000000        <1>         ja      XO_OUT
  1330 000048B3 80BF[25820100]00    <1>         CMP	byte [DSK_STATE+eDI],0	; NO DRIVE ?
  1331 000048BA 747D                <1> 	JZ	short XO_OUT		; IF NO DRIVE TRANSLATE DONE
  1332                              <1> 
  1333                              <1> ;-----	TEST FOR SAVED DRIVE INFORMATION ALREADY SET
  1334                              <1> 
  1335 000048BC 6689F9              <1> 	MOV	CX,DI			; CX = DRIVE NUMBER
  1336 000048BF C0E102              <1> 	SHL	CL,2			; CL = SHIFT COUNT, A=0, B=4
  1337 000048C2 B402                <1> 	MOV	AH,FMT_CAPA		; LOAD MULTIPLE DATA RATE BIT MASK
  1338 000048C4 D2CC                <1> 	ROR	AH,CL			; ROTATE BY MASK
  1339 000048C6 8425[24820100]      <1> 	TEST	[HF_CNTRL], AH		; MULTIPLE-DATA RATE DETERMINED ?
  1340 000048CC 751C                <1> 	JNZ	short SAVE_SET		; IF SO, NO NEED TO RE-SAVE
  1341                              <1> 
  1342                              <1> ;-----	ERASE DRIVE BITS IN @HF_CNTRL FOR THIS DRIVE
  1343                              <1> 
  1344 000048CE B407                <1> 	MOV	AH,DRV_DET+FMT_CAPA+TRK_CAPA ; MASK TO KEEP
  1345 000048D0 D2CC                <1> 	ROR	AH,CL			; FIX MASK TO KEEP
  1346 000048D2 F6D4                <1> 	NOT	AH			; TRANSLATE MASK
  1347 000048D4 2025[24820100]      <1> 	AND	[HF_CNTRL], AH		; KEEP BITS FROM OTHER DRIVE INTACT
  1348                              <1> 
  1349                              <1> ;-----	ACCESS CURRENT DRIVE BITS AND STORE IN @HF_CNTRL
  1350                              <1> 
  1351 000048DA 8A87[25820100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; ACCESS STATE
  1352 000048E0 2407                <1> 	AND	AL,DRV_DET+FMT_CAPA+TRK_CAPA ; KEEP DRIVE BITS
  1353 000048E2 D2C8                <1> 	ROR	AL,CL			; FIX FOR THIS DRIVE
  1354 000048E4 0805[24820100]      <1> 	OR	[HF_CNTRL], AL		; UPDATE SAVED DRIVE STATE
  1355                              <1> 
  1356                              <1> ;-----	TRANSLATE TO COMPATIBILITY MODE
  1357                              <1> 
  1358                              <1> SAVE_SET:
  1359 000048EA 8AA7[25820100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; ACCESS STATE
  1360 000048F0 88E7                <1> 	MOV	BH,AH			; TO BH FOR LATER
  1361 000048F2 80E4C0              <1> 	AND	AH,RATE_MSK		; KEEP ONLY RATE
  1362 000048F5 80FC00              <1> 	CMP	AH,RATE_500		; RATE 500 ?
  1363 000048F8 7410                <1> 	JZ	short CHK_144		; YES 1.2/1.2 OR 1.44/1.44
  1364 000048FA B001                <1> 	MOV	AL,M3D1U		; AL = 360 IN 1.2 UNESTABLISHED
  1365 000048FC 80FC40              <1> 	CMP	AH,RATE_300		; RATE 300 ?
  1366 000048FF 7518                <1> 	JNZ	short CHK_250		; NO, 360/360, 720/720 OR 720/1.44
  1367 00004901 F6C720              <1> 	TEST	BH,DBL_STEP		; CHECK FOR DOUBLE STEP
  1368 00004904 751F                <1> 	JNZ	short TST_DET		; MUST BE 360 IN 1.2
  1369                              <1> UNKNO:
  1370 00004906 B007                <1> 	MOV	AL,MED_UNK		; NONE OF THE ABOVE
  1371 00004908 EB22                <1> 	JMP	SHORT AL_SET		; PROCESS COMPLETE
  1372                              <1> CHK_144:
  1373 0000490A E8A5050000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN (AL)
  1374                              <1> 	;;20/02/2015
  1375                              <1> 	;;JC	short UNKNO		; ERROR, SET 'NONE OF ABOVE'
  1376 0000490F 74F5                <1> 	jz	short UNKNO ;; 20/02/2015
  1377 00004911 3C02                <1> 	CMP	AL,2			; 1.2MB DRIVE ?
  1378 00004913 75F1                <1> 	JNE	short UNKNO		; NO, GO SET 'NONE OF ABOVE'
  1379 00004915 B002                <1> 	MOV	AL,M1D1U		; AL = 1.2 IN 1.2 UNESTABLISHED
  1380 00004917 EB0C                <1> 	JMP	SHORT TST_DET
  1381                              <1> CHK_250:
  1382 00004919 B000                <1> 	MOV	AL,M3D3U		; AL = 360 IN 360 UNESTABLISHED
  1383 0000491B 80FC80              <1> 	CMP	AH,RATE_250		; RATE 250 ?
  1384 0000491E 75E6                <1> 	JNZ	short UNKNO		; IF SO FALL IHRU
  1385 00004920 F6C701              <1> 	TEST	BH,TRK_CAPA		; 80 TRACK CAPABILITY ?
  1386 00004923 75E1                <1> 	JNZ	short UNKNO		; IF SO JUMP, FALL THRU TEST DET
  1387                              <1> TST_DET:
  1388 00004925 F6C710              <1> 	TEST	BH,MED_DET		; DETERMINED ?
  1389 00004928 7402                <1> 	JZ	short AL_SET		; IF NOT THEN SET
  1390 0000492A 0403                <1> 	ADD	AL,3			; MAKE DETERMINED/ESTABLISHED
  1391                              <1> AL_SET:
  1392 0000492C 80A7[25820100]F8    <1> 	AND	byte [DSK_STATE+eDI], ~(DRV_DET+FMT_CAPA+TRK_CAPA) ; CLEAR DRIVE
  1393 00004933 0887[25820100]      <1> 	OR	[DSK_STATE+eDI], AL	; REPLACE WITH COMPATIBLE MODE
  1394                              <1> XO_OUT:
  1395 00004939 C3                  <1> 	RETn
  1396                              <1> 
  1397                              <1> ;-------------------------------------------------------------------------------
  1398                              <1> ; RD_WR_VF
  1399                              <1> ;	COMMON READ, WRITE AND VERIFY: 
  1400                              <1> ;	MAIN LOOP FOR STATE RETRIES.
  1401                              <1> ;
  1402                              <1> ; ON ENTRY:	AH = READ/WRITE/VERIFY NEC PARAMETER
  1403                              <1> ;		AL = READ/WRITE/VERIFY DMA PARAMETER
  1404                              <1> ;
  1405                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1406                              <1> ;-------------------------------------------------------------------------------
  1407                              <1> RD_WR_VF:
  1408 0000493A 6650                <1> 	PUSH	AX			; SAVE DMA, NEC PARAMETERS
  1409 0000493C E838FFFFFF          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1410 00004941 E8F3000000          <1> 	CALL	SETUP_STATE		; INITIALIZE START AND END RATE
  1411 00004946 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY
  1412                              <1> DO_AGAIN:
  1413 00004948 6650                <1> 	PUSH	AX			; SAVE READ/WRITE/VERIFY PARAMETER
  1414 0000494A E87F010000          <1> 	CALL	MED_CHANGE		; MEDIA CHANGE AND RESET IF CHANGED
  1415 0000494F 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY
  1416 00004951 0F82C9000000        <1>         JC      RWV_END                 ; MEDIA CHANGE ERROR OR TIME-OUT
  1417                              <1> RWV:
  1418 00004957 6650                <1> 	PUSH	AX			; SAVE READ/WRITE/VERIFY PARAMETER
  1419 00004959 8AB7[25820100]      <1> 	MOV	DH, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1420 0000495F 80E6C0              <1> 	AND	DH,RATE_MSK		; KEEP ONLY RATE
  1421 00004962 E84D050000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN AL (AL)
  1422                              <1> 	;;20/02/2015
  1423                              <1> 	;;JC	short RWV_ASSUME	; ERROR IN CMOS
  1424 00004967 7451                <1> 	jz	short RWV_ASSUME ; 20/02/2015
  1425 00004969 3C01                <1> 	CMP	AL,1			; 40 TRACK DRIVE?
  1426 0000496B 750D                <1> 	JNE	short RWV_1		; NO, BYPASS CMOS VALIDITY CHECK
  1427 0000496D F687[25820100]01    <1> 	TEST	byte [DSK_STATE+eDI], TRK_CAPA ; CHECK FOR 40 TRACK DRIVE
  1428 00004974 7413                <1> 	JZ	short RWV_2		; YES, CMOS IS CORRECT
  1429 00004976 B002                <1> 	MOV	AL,2			; CHANGE TO 1.2M
  1430 00004978 EB0F                <1> 	JMP	SHORT RWV_2
  1431                              <1> RWV_1:
  1432 0000497A 720D                <1> 	JB	short RWV_2		; NO DRIVE SPECIFIED, CONTINUE
  1433 0000497C F687[25820100]01    <1> 	TEST    byte [DSK_STATE+eDI], TRK_CAPA ; IS IT REALLY 40 TRACK?
  1434 00004983 7504                <1> 	JNZ	short RWV_2		; NO, 80 TRACK
  1435 00004985 B001                <1> 	MOV	AL,1			; IT IS 40 TRACK, FIX CMOS VALUE
  1436 00004987 EB04                <1> 	jmp	short rwv_3
  1437                              <1> RWV_2:
  1438 00004989 08C0                <1> 	OR	AL,AL			; TEST FOR NO DRIVE
  1439 0000498B 742D                <1> 	JZ	short RWV_ASSUME	; ASSUME TYPE, USE MAX TRACK
  1440                              <1> rwv_3:
  1441 0000498D E873FEFFFF          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL.
  1442 00004992 7226                <1> 	JC	short RWV_ASSUME	; TYPE NOT IN TABLE (BAD CMOS)
  1443                              <1> 
  1444                              <1> ;-----	SEARCH FOR MEDIA/DRIVE PARAMETER TABLE
  1445                              <1> 
  1446 00004994 57                  <1> 	PUSH	eDI			; SAVE DRIVE #
  1447 00004995 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR_TYPE TABLE
  1448 00004997 B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1449                              <1> RWV_DR_SEARCH:
  1450 0000499C 8AA3[686D0000]      <1> 	MOV	AH, [DR_TYPE+eBX]	; GET DRIVE TYPE
  1451 000049A2 80E47F              <1> 	AND	AH,BIT7OFF		; MASK OUT MSB
  1452 000049A5 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH?
  1453 000049A7 750B                <1> 	JNE	short RWV_NXT_MD	; NO, CHECK NEXT DRIVE TYPE
  1454                              <1> RWV_DR_FND:
  1455 000049A9 8BBB[696D0000]      <1> 	MOV	eDI, [DR_TYPE+eBX+1] 	; DI = MEDIA/DRIVE PARAMETER TABLE
  1456                              <1> RWV_MD_SEARH:
  1457 000049AF 3A770C              <1>         CMP     DH, [eDI+MD.RATE]       ; MATCH?
  1458 000049B2 741B                <1> 	JE	short RWV_MD_FND	; YES, GO GET 1ST SPECIFY BYTE
  1459                              <1> RWV_NXT_MD:
  1460                              <1> 	;ADD	BX,3			; CHECK NEXT DRIVE TYPE
  1461 000049B4 83C305              <1> 	add	eBX, 5
  1462 000049B7 E2E3                <1> 	LOOP	RWV_DR_SEARCH
  1463 000049B9 5F                  <1> 	POP	eDI			; RESTORE DRIVE #
  1464                              <1> 
  1465                              <1> ;-----	ASSUME PRIMARY DRIVE IS INSTALLED AS SHIPPED
  1466                              <1> 
  1467                              <1> RWV_ASSUME:
  1468 000049BA BB[866D0000]        <1> 	MOV	eBX, MD_TBL1		; POINT TO 40 TRACK 250 KBS
  1469 000049BF F687[25820100]01    <1> 	TEST 	byte [DSK_STATE+eDI], TRK_CAPA ; TEST FOR 80 TRACK
  1470 000049C6 740A                <1> 	JZ	short RWV_MD_FND1	; MUST BE 40 TRACK
  1471 000049C8 BB[A06D0000]        <1> 	MOV	eBX, MD_TBL3		; POINT TO 80 TRACK 500 KBS
  1472 000049CD EB03                <1> 	JMP	short RWV_MD_FND1	; GO SPECIFY PARAMTERS
  1473                              <1> 
  1474                              <1> ;-----	CS:BX POINTS TO MEDIA/DRIVE PARAMETER TABLE
  1475                              <1> 	 			
  1476                              <1> RWV_MD_FND:
  1477 000049CF 89FB                <1> 	MOV	eBX,eDI			; BX = MEDIA/DRIVE PARAMETER TABLE
  1478 000049D1 5F                  <1> 	POP	eDI			; RESTORE DRIVE #
  1479                              <1> 	
  1480                              <1> ;-----	SEND THE SPECIFY COMMAND TO THE CONTROLLER
  1481                              <1> 
  1482                              <1> RWV_MD_FND1:
  1483 000049D2 E882FEFFFF          <1> 	CALL	SEND_SPEC_MD
  1484 000049D7 E864010000          <1> 	CALL	CHK_LASTRATE		; ZF=1 ATTEMP RATE IS SAME AS LAST RATE
  1485 000049DC 7405                <1> 	JZ	short RWV_DBL		; YES,SKIP SEND RATE COMMAND
  1486 000049DE E83B010000          <1> 	CALL	SEND_RATE		; SEND DATA RATE TO NEC
  1487                              <1> RWV_DBL:
  1488 000049E3 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1489 000049E4 E822040000          <1> 	CALL	SETUP_DBL		; CHECK FOR DOUBLE STEP
  1490 000049E9 5B                  <1> 	POP	eBX			; RESTORE ADDRESS
  1491 000049EA 7226                <1> 	JC	short CHK_RET		; ERROR FROM READ ID, POSSIBLE RETRY
  1492 000049EC 6658                <1> 	POP	AX			; RESTORE NEC, DMA COMMAND
  1493 000049EE 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1494 000049F0 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1495 000049F1 E861010000          <1> 	CALL	DMA_SETUP		; SET UP THE DMA
  1496 000049F6 5B                  <1> 	POP	eBX 
  1497 000049F7 6658                <1> 	POP	AX			; RESTORE NEC COMMAND
  1498 000049F9 722F                <1> 	JC	short RWV_BAC		; CHECK FOR DMA BOUNDARY ERROR
  1499 000049FB 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1500 000049FD 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1501 000049FE E83C020000          <1> 	CALL	NEC_INIT		; INITIALIZE NEC
  1502 00004A03 5B                  <1> 	POP	eBX			; RESTORE ADDRESS
  1503 00004A04 720C                <1> 	JC	short CHK_RET		; ERROR - EXIT
  1504 00004A06 E866020000          <1> 	CALL	RWV_COM			; OP CODE COMMON TO READ/WRITE/VERIFY
  1505 00004A0B 7205                <1> 	JC	short CHK_RET		; ERROR - EXIT
  1506 00004A0D E8AB020000          <1> 	CALL	NEC_TERM		; TERMINATE, GET STATUS, ETC.
  1507                              <1> CHK_RET:
  1508 00004A12 E84A030000          <1> 	CALL	RETRY			; CHECK FOR, SETUP RETRY
  1509 00004A17 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY PARAMETER
  1510 00004A19 7305                <1> 	JNC	short RWV_END		; CY = 0 NO RETRY
  1511 00004A1B E928FFFFFF          <1>         JMP     DO_AGAIN                ; CY = 1 MEANS RETRY
  1512                              <1> RWV_END:
  1513 00004A20 E8F4020000          <1> 	CALL	DSTATE			; ESTABLISH STATE IF SUCCESSFUL
  1514 00004A25 E887030000          <1> 	CALL	NUM_TRANS		; AL = NUMBER TRANSFERRED
  1515                              <1> RWV_BAC:				; BAD DMA ERROR ENTRY
  1516 00004A2A 6650                <1> 	PUSH	AX			; SAVE NUMBER TRANSFERRED
  1517 00004A2C E879FEFFFF          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1518 00004A31 6658                <1> 	POP	AX			; RESTORE NUMBER TRANSFERRED
  1519 00004A33 E8B1030000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1520 00004A38 C3                  <1> 	RETn
  1521                              <1> 
  1522                              <1> ;-------------------------------------------------------------------------------
  1523                              <1> ; SETUP_STATE:	INITIALIZES START AND END RATES.
  1524                              <1> ;-------------------------------------------------------------------------------
  1525                              <1> SETUP_STATE:
  1526 00004A39 F687[25820100]10    <1> 	TEST	byte [DSK_STATE+eDI], MED_DET ; MEDIA DETERMINED ?
  1527 00004A40 7537                <1> 	JNZ	short J1C		; NO STATES IF DETERMINED
  1528 00004A42 66B84000            <1>         MOV     AX,(RATE_500*256)+RATE_300  ; AH = START RATE, AL = END RATE
  1529 00004A46 F687[25820100]04    <1> 	TEST	byte [DSK_STATE+eDI],DRV_DET ; DRIVE ?
  1530 00004A4D 740D                <1> 	JZ	short AX_SET		; DO NOT KNOW DRIVE
  1531 00004A4F F687[25820100]02    <1> 	TEST	byte [DSK_STATE+eDI], FMT_CAPA ; MULTI-RATE?
  1532 00004A56 7504                <1> 	JNZ	short AX_SET		; JUMP IF YES
  1533 00004A58 66B88080            <1>         MOV     AX,RATE_250*257         ; START A END RATE 250 FOR 360 DRIVE
  1534                              <1> AX_SET:	
  1535 00004A5C 80A7[25820100]1F    <1> 	AND	byte [DSK_STATE+eDI], ~(RATE_MSK+DBL_STEP) ; TURN OFF THE RATE
  1536 00004A63 08A7[25820100]      <1> 	OR	[DSK_STATE+eDI], AH	; RATE FIRST TO TRY
  1537 00004A69 8025[20820100]F3    <1> 	AND	byte [LASTRATE], ~STRT_MSK ; ERASE LAST TO TRY RATE BITS
  1538 00004A70 C0C804              <1> 	ROR	AL,4			; TO OPERATION LAST RATE LOCATION
  1539 00004A73 0805[20820100]      <1> 	OR	[LASTRATE], AL		; LAST RATE
  1540                              <1> J1C:	
  1541 00004A79 C3                  <1> 	RETn
  1542                              <1> 
  1543                              <1> ;-------------------------------------------------------------------------------
  1544                              <1> ;  FMT_INIT: ESTABLISH STATE IF UNESTABLISHED AT FORMAT TIME.
  1545                              <1> ;-------------------------------------------------------------------------------
  1546                              <1> FMT_INIT:
  1547 00004A7A F687[25820100]10    <1> 	TEST	byte [DSK_STATE+eDI], MED_DET ; IS MEDIA ESTABLISHED
  1548 00004A81 7546                <1> 	JNZ	short F1_OUT		; IF SO RETURN
  1549 00004A83 E82C040000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN AL
  1550                              <1> 	;; 20/02/2015
  1551                              <1> 	;;JC	short CL_DRV		; ERROR IN CMOS ASSUME NO DRIVE
  1552 00004A88 7440                <1> 	jz	short CL_DRV ;; 20/02/2015
  1553 00004A8A FEC8                <1> 	DEC	AL			; MAKE ZERO ORIGIN
  1554                              <1> 	;;JS	short CL_DRV		; NO DRIVE IF AL 0
  1555 00004A8C 8AA7[25820100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; AH = CURRENT STATE
  1556 00004A92 80E40F              <1> 	AND	AH, ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR
  1557 00004A95 08C0                <1> 	OR	AL,AL			; CHECK FOR 360
  1558 00004A97 7505                <1> 	JNZ	short N_360		; IF 360 WILL BE 0
  1559 00004A99 80CC90              <1> 	OR	AH,MED_DET+RATE_250	; ESTABLISH MEDIA
  1560 00004A9C EB25                <1> 	JMP	SHORT SKP_STATE		; SKIP OTHER STATE PROCESSING
  1561                              <1> N_360:	
  1562 00004A9E FEC8                <1> 	DEC	AL			; 1.2 M DRIVE
  1563 00004AA0 7505                <1> 	JNZ	short N_12		; JUMP IF NOT
  1564                              <1> F1_RATE:
  1565 00004AA2 80CC10              <1> 	OR	AH,MED_DET+RATE_500	; SET FORMAT RATE
  1566 00004AA5 EB1C                <1> 	JMP	SHORT SKP_STATE		; SKIP OTHER STATE PROCESSING
  1567                              <1> N_12:	
  1568 00004AA7 FEC8                <1> 	DEC	AL			; CHECK FOR TYPE 3
  1569 00004AA9 750F                <1> 	JNZ	short N_720		; JUMP IF NOT
  1570 00004AAB F6C404              <1> 	TEST	AH,DRV_DET		; IS DRIVE DETERMINED
  1571 00004AAE 7410                <1> 	JZ	short ISNT_12		; TREAT AS NON 1.2 DRIVE
  1572 00004AB0 F6C402              <1> 	TEST	AH,FMT_CAPA		; IS 1.2M
  1573 00004AB3 740B                <1> 	JZ	short ISNT_12		; JUMP IF NOT
  1574 00004AB5 80CC50              <1> 	OR	AH,MED_DET+RATE_300	; RATE 300
  1575 00004AB8 EB09                <1> 	JMP	SHORT SKP_STATE		; CONTINUE
  1576                              <1> N_720:
  1577 00004ABA FEC8                <1> 	DEC	AL			; CHECK FOR TYPE 4
  1578 00004ABC 750C                <1> 	JNZ	short CL_DRV		; NO DRIVE, CMOS BAD
  1579 00004ABE EBE2                <1> 	JMP	SHORT F1_RATE
  1580                              <1> ISNT_12: 
  1581 00004AC0 80CC90              <1> 	OR	AH,MED_DET+RATE_250	; MUST BE RATE 250
  1582                              <1> 
  1583                              <1> SKP_STATE:
  1584 00004AC3 88A7[25820100]      <1> 	MOV	[DSK_STATE+eDI], AH	; STORE AWAY
  1585                              <1> F1_OUT:
  1586 00004AC9 C3                  <1> 	RETn
  1587                              <1> CL_DRV:	
  1588 00004ACA 30E4                <1> 	XOR	AH,AH			; CLEAR STATE
  1589 00004ACC EBF5                <1> 	JMP	SHORT SKP_STATE		; SAVE IT
  1590                              <1> 
  1591                              <1> ;-------------------------------------------------------------------------------
  1592                              <1> ; MED_CHANGE	
  1593                              <1> ;	CHECKS FOR MEDIA CHANGE, RESETS MEDIA CHANGE, 
  1594                              <1> ;	CHECKS MEDIA CHANGE AGAIN.
  1595                              <1> ;
  1596                              <1> ; ON EXIT:	CY = 1 MEANS MEDIA CHANGE OR TIMEOUT
  1597                              <1> ;		@DSKETTE_STATUS = ERROR CODE
  1598                              <1> ;-------------------------------------------------------------------------------
  1599                              <1> MED_CHANGE:
  1600 00004ACE E888060000          <1> 	CALL	READ_DSKCHNG		; READ DISK CHANCE LINE STATE
  1601 00004AD3 7447                <1> 	JZ	short MC_OUT		; BYPASS HANDLING DISK CHANGE LINE
  1602 00004AD5 80A7[25820100]EF    <1> 	AND	byte [DSK_STATE+eDI], ~MED_DET ; CLEAR STATE FOR THIS DRIVE
  1603                              <1> 
  1604                              <1> ;	THIS SEQUENCE ENSURES WHENEVER A DISKETTE IS CHANGED THAT
  1605                              <1> ;	ON THE NEXT OPERATION THE REQUIRED MOTOR START UP TIME WILL
  1606                              <1> ;	BE WAITED. (DRIVE MOTOR MAY GO OFF UPON DOOR OPENING).
  1607                              <1> 
  1608 00004ADC 6689F9              <1> 	MOV	CX,DI			; CL = DRIVE 0
  1609 00004ADF B001                <1> 	MOV	AL,1			; MOTOR ON BIT MASK
  1610 00004AE1 D2E0                <1> 	SHL	AL,CL			; TO APPROPRIATE POSITION
  1611 00004AE3 F6D0                <1> 	NOT	AL			; KEEP ALL BUT MOTOR ON
  1612 00004AE5 FA                  <1> 	CLI				; NO INTERRUPTS
  1613 00004AE6 2005[16820100]      <1> 	AND	[MOTOR_STATUS], AL	; TURN MOTOR OFF INDICATOR
  1614 00004AEC FB                  <1> 	STI				; INTERRUPTS ENABLED
  1615 00004AED E810040000          <1> 	CALL	MOTOR_ON		; TURN MOTOR ON
  1616                              <1> 
  1617                              <1> ;-----	THIS SEQUENCE OF SEEKS IS USED TO RESET DISKETTE CHANGE SIGNAL
  1618                              <1> 
  1619 00004AF2 E850F9FFFF          <1> 	CALL	DSK_RESET		; RESET NEC
  1620 00004AF7 B501                <1> 	MOV	CH,01H			; MOVE TO CYLINDER 1
  1621 00004AF9 E8FF040000          <1> 	CALL	SEEK			; ISSUE SEEK
  1622 00004AFE 30ED                <1> 	XOR	CH,CH			; MOVE TO CYLINDER 0
  1623 00004B00 E8F8040000          <1> 	CALL	SEEK			; ISSUE SEEK
  1624 00004B05 C605[18820100]06    <1> 	MOV	byte [DSKETTE_STATUS], MEDIA_CHANGE ; STORE IN STATUS
  1625                              <1> OK1:
  1626 00004B0C E84A060000          <1> 	CALL	READ_DSKCHNG		; CHECK MEDIA CHANGED AGAIN
  1627 00004B11 7407                <1> 	JZ	short OK2		; IF ACTIVE, NO DISKETTE, TIMEOUT
  1628                              <1> OK4:
  1629 00004B13 C605[18820100]80    <1> 	MOV	byte [DSKETTE_STATUS], TIME_OUT ; TIMEOUT IF DRIVE EMPTY
  1630                              <1> OK2:		
  1631 00004B1A F9                  <1> 	STC				; MEDIA CHANGED, SET CY
  1632 00004B1B C3                  <1> 	RETn
  1633                              <1> MC_OUT:
  1634 00004B1C F8                  <1> 	CLC				; NO MEDIA CHANGED, CLEAR CY
  1635 00004B1D C3                  <1> 	RETn
  1636                              <1> 
  1637                              <1> ;-------------------------------------------------------------------------------
  1638                              <1> ; SEND_RATE
  1639                              <1> ;	SENDS DATA RATE COMMAND TO NEC
  1640                              <1> ; ON ENTRY:	DI = DRIVE #
  1641                              <1> ; ON EXIT:	NONE
  1642                              <1> ; REGISTERS ALTERED: DX
  1643                              <1> ;-------------------------------------------------------------------------------
  1644                              <1> SEND_RATE:
  1645 00004B1E 6650                <1> 	PUSH	AX			; SAVE REG.
  1646 00004B20 8025[20820100]3F    <1> 	AND	byte [LASTRATE], ~SEND_MSK ; ELSE CLEAR LAST RATE ATTEMPTED
  1647 00004B27 8A87[25820100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1648 00004B2D 24C0                <1> 	AND	AL,SEND_MSK		; KEEP ONLY RATE BITS
  1649 00004B2F 0805[20820100]      <1> 	OR	[LASTRATE], AL		; SAVE NEW RATE FOR NEXT CHECK
  1650 00004B35 C0C002              <1> 	ROL	AL,2			; MOVE TO BIT OUTPUT POSITIONS
  1651 00004B38 66BAF703            <1> 	MOV	DX,03F7H		; OUTPUT NEW DATA RATE
  1652 00004B3C EE                  <1> 	OUT	DX,AL
  1653 00004B3D 6658                <1> 	POP	AX			; RESTORE REG.
  1654 00004B3F C3                  <1> 	RETn
  1655                              <1> 
  1656                              <1> ;-------------------------------------------------------------------------------
  1657                              <1> ; CHK_LASTRATE
  1658                              <1> ;	CHECK PREVIOUS DATE RATE SNT TO THE CONTROLLER.
  1659                              <1> ; ON ENTRY:
  1660                              <1> ;	DI = DRIVE #
  1661                              <1> ; ON EXIT:
  1662                              <1> ;	ZF =  1 DATA RATE IS THE SAME AS THE LAST RATE SENT TO NEC
  1663                              <1> ;	ZF =  0 DATA RATE IS DIFFERENT FROM LAST RATE
  1664                              <1> ; REGISTERS ALTERED: DX
  1665                              <1> ;-------------------------------------------------------------------------------
  1666                              <1> CHK_LASTRATE:
  1667 00004B40 6650                <1> 	PUSH	AX			; SAVE REG
  1668 00004B42 2225[20820100]      <1> 	AND	AH, [LASTRATE]		; GET LAST DATA RATE SELECTED
  1669 00004B48 8A87[25820100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1670 00004B4E 6625C0C0            <1>         AND     AX, SEND_MSK*257        ; KEEP ONLY RATE BITS OF BOTH
  1671 00004B52 38E0                <1> 	CMP	AL, AH			; COMPARE TO PREVIOUSLY TRIED
  1672                              <1> 					; ZF = 1 RATE IS THE SAME
  1673 00004B54 6658                <1> 	POP	AX			; RESTORE REG.
  1674 00004B56 C3                  <1> 	RETn
  1675                              <1> 
  1676                              <1> ;-------------------------------------------------------------------------------
  1677                              <1> ; DMA_SETUP
  1678                              <1> ;	THIS ROUTINE SETS UP THE DMA FOR READ/WRITE/VERIFY OPERATIONS.
  1679                              <1> ;
  1680                              <1> ; ON ENTRY:	AL = DMA COMMAND
  1681                              <1> ;
  1682                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1683                              <1> ;-------------------------------------------------------------------------------
  1684                              <1> 
  1685                              <1> ; SI = Head #, # of Sectors or DASD Type
  1686                              <1> 
  1687                              <1> ; 22/08/2015
  1688                              <1> ; 08/02/2015 - Protected Mode Modification
  1689                              <1> ; 06/02/2015 - 07/02/2015
  1690                              <1> ; NOTE: Buffer address must be in 1st 16MB of Physical Memory (24 bit limit).
  1691                              <1> ; (DMA Addres = Physical Address)
  1692                              <1> ; (Retro UNIX 386 v1 Kernel/System Mode Virtual Address = Physical Address)
  1693                              <1> ;
  1694                              <1> 
  1695                              <1> 
  1696                              <1> ; 04/02/2016 (clc)
  1697                              <1> ; 20/02/2015 modification (source: AWARD BIOS 1999, DMA_SETUP)
  1698                              <1> ; 16/12/2014 (IODELAY)
  1699                              <1> 
  1700                              <1> DMA_SETUP:
  1701                              <1> 
  1702                              <1> ;; 20/02/2015
  1703 00004B57 8B5504              <1> 	mov	edx, [ebp+4] 		; Buffer address
  1704 00004B5A F7C2000000FF        <1> 	test	edx, 0FF000000h		; 16 MB limit (22/08/2015, bugfix)
  1705 00004B60 756E                <1> 	jnz	short dma_bnd_err_stc
  1706                              <1> 	;
  1707 00004B62 6650                <1> 	push	ax			; DMA command
  1708 00004B64 52                  <1> 	push	edx			; *
  1709 00004B65 B203                <1> 	mov	dl, 3			; GET BYTES/SECTOR PARAMETER
  1710 00004B67 E851030000          <1> 	call	GET_PARM		; 
  1711 00004B6C 88E1                <1> 	mov	cl, ah 			; SHIFT COUNT (0=128, 1=256, 2=512 ETC)
  1712 00004B6E 6689F0              <1> 	mov	ax, si			; Sector count
  1713 00004B71 88C4                <1> 	mov	ah, al			; AH =  # OF SECTORS
  1714 00004B73 28C0                <1> 	sub	al, al			; AL = 0, AX = # SECTORS * 256
  1715 00004B75 66D1E8              <1> 	shr	ax, 1			; AX = # SECTORS * 128
  1716 00004B78 66D3E0              <1> 	shl	ax, cl			; SHIFT BY PARAMETER VALUE
  1717 00004B7B 6648                <1> 	dec	ax			; -1 FOR DMA VALUE
  1718 00004B7D 6689C1              <1> 	mov	cx, ax
  1719 00004B80 5A                  <1> 	pop	edx			; *
  1720 00004B81 6658                <1> 	pop	ax
  1721 00004B83 3C42                <1> 	cmp	al, 42h
  1722 00004B85 7507                <1>         jne     short NOT_VERF
  1723 00004B87 BA0000FF00          <1> 	mov	edx, 0FF0000h
  1724 00004B8C EB08                <1> 	jmp	short J33
  1725                              <1> NOT_VERF:
  1726 00004B8E 6601CA              <1> 	add	dx, cx			; check for overflow
  1727 00004B91 723E                <1> 	jc	short dma_bnd_err
  1728                              <1> 	;
  1729 00004B93 6629CA              <1> 	sub	dx, cx			; Restore start address
  1730                              <1> J33:
  1731 00004B96 FA                  <1> 	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1732 00004B97 E60C                <1> 	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1733                              <1> 	IODELAY				; WAIT FOR I/O
  1733 00004B99 EB00                <2>  jmp short $+2
  1733 00004B9B EB00                <2>  jmp short $+2
  1734 00004B9D E60B                <1> 	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1735 00004B9F 89D0                <1> 	mov	eax, edx		; Buffer address
  1736 00004BA1 E604                <1> 	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1737                              <1> 	IODELAY				; WAIT FOR I/O
  1737 00004BA3 EB00                <2>  jmp short $+2
  1737 00004BA5 EB00                <2>  jmp short $+2
  1738 00004BA7 88E0                <1> 	MOV	AL,AH
  1739 00004BA9 E604                <1> 	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1740 00004BAB C1E810              <1> 	shr	eax, 16
  1741                              <1> 	IODELAY				; I/O WAIT STATE
  1741 00004BAE EB00                <2>  jmp short $+2
  1741 00004BB0 EB00                <2>  jmp short $+2
  1742 00004BB2 E681                <1> 	OUT	081H,AL			; OUTPUT highest BITS TO PAGE REGISTER
  1743                              <1> 	IODELAY
  1743 00004BB4 EB00                <2>  jmp short $+2
  1743 00004BB6 EB00                <2>  jmp short $+2
  1744 00004BB8 6689C8              <1> 	mov	ax, cx			; Byte count - 1
  1745 00004BBB E605                <1> 	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1746                              <1> 	IODELAY				; WAIT FOR I/O
  1746 00004BBD EB00                <2>  jmp short $+2
  1746 00004BBF EB00                <2>  jmp short $+2
  1747 00004BC1 88E0                <1> 	MOV	AL, AH
  1748 00004BC3 E605                <1> 	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1749                              <1> 	IODELAY
  1749 00004BC5 EB00                <2>  jmp short $+2
  1749 00004BC7 EB00                <2>  jmp short $+2
  1750 00004BC9 FB                  <1> 	STI				; RE-ENABLE INTERRUPTS
  1751 00004BCA B002                <1> 	MOV	AL, 2			; MODE FOR 8237
  1752 00004BCC E60A                <1> 	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1753                              <1> 
  1754 00004BCE F8                  <1> 	clc	; 04/02/2016
  1755 00004BCF C3                  <1> 	retn
  1756                              <1> 
  1757                              <1> dma_bnd_err_stc:
  1758 00004BD0 F9                  <1> 	stc
  1759                              <1> dma_bnd_err:
  1760 00004BD1 C605[18820100]09    <1> 	MOV	byte [DSKETTE_STATUS], DMA_BOUNDARY ; SET ERROR
  1761 00004BD8 C3                  <1> 	RETn				; CY SET BY ABOVE IF ERROR
  1762                              <1> 
  1763                              <1> ;; 16/12/2014
  1764                              <1> ;;	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1765                              <1> ;;	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1766                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1767                              <1> ;;	IODELAY
  1768                              <1> ;; 	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1769                              <1> ;;	;SIODELAY
  1770                              <1> ;;      ;CMP	AL, 42H			; DMA VERIFY COMMAND
  1771                              <1> ;;      ;JNE	short NOT_VERF		; NO
  1772                              <1> ;;      ;XOR	AX, AX			; START ADDRESS
  1773                              <1> ;;      ;JMP	SHORT J33
  1774                              <1> ;;;NOT_VERF:	
  1775                              <1> ;;	;MOV	AX,ES			; GET THE ES VALUE
  1776                              <1> ;;	;ROL	AX,4			; ROTATE LEFT
  1777                              <1> ;;	;MOV	CH,AL			; GET HIGHEST NIBBLE OF ES TO CH
  1778                              <1> ;;	;AND	AL,11110000B		; ZERO THE LOW NIBBLE FROM SEGMENT
  1779                              <1> ;;	;ADD	AX,[BP+2]		; TEST FOR CARRY FROM ADDITION
  1780                              <1> ;;	mov	eax, [ebp+4] ; 06/02/2015	
  1781                              <1> ;;	;JNC	short J33
  1782                              <1> ;;	;INC	CH			; CARRY MEANS HIGH 4 BITS MUST BE INC
  1783                              <1> ;;;J33:
  1784                              <1> ;;	PUSH	eAX			; SAVE START ADDRESS
  1785                              <1> ;;	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1786                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1787                              <1> ;;	IODELAY
  1788                              <1> ;;	MOV	AL,AH
  1789                              <1> ;;	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1790                              <1> ;;	shr	eax, 16	     ; 07/02/2015
  1791                              <1> ;;	;MOV	AL,CH			; GET HIGH 4 BITS
  1792                              <1> ;;	;JMP	$+2			; I/O WAIT STATE
  1793                              <1> ;;	IODELAY
  1794                              <1> ;;	;AND	AL,00001111B
  1795                              <1> ;;	OUT	081H,AL			; OUTPUT HIGH 4 BITS TO PAGE REGISTER
  1796                              <1> ;;	;SIODELAY
  1797                              <1> ;;
  1798                              <1> ;;;----- DETERMINE COUNT
  1799                              <1> ;;	sub	eax, eax ; 08/02/2015
  1800                              <1> ;;	MOV	AX, SI			; AL =  # OF SECTORS
  1801                              <1> ;;	XCHG	AL, AH			; AH =  # OF SECTORS
  1802                              <1> ;;	SUB	AL, AL			; AL = 0, AX = # SECTORS * 256
  1803                              <1> ;;	SHR	AX, 1			; AX = # SECTORS * 128
  1804                              <1> ;;	PUSH	AX			; SAVE # OF SECTORS * 128
  1805                              <1> ;;	MOV	DL, 3			; GET BYTES/SECTOR PARAMETER
  1806                              <1> ;;	CALL	GET_PARM		; "
  1807                              <1> ;;	MOV	CL,AH			; SHIFT COUNT (0=128, 1=256, 2=512 ETC)
  1808                              <1> ;;	POP	AX			; AX = # SECTORS * 128
  1809                              <1> ;;	SHL	AX,CL			; SHIFT BY PARAMETER VALUE
  1810                              <1> ;;	DEC	AX			; -1 FOR DMA VALUE
  1811                              <1> ;;	PUSH	eAX  ; 08/02/2015	; SAVE COUNT VALUE
  1812                              <1> ;;	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1813                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1814                              <1> ;;	IODELAY
  1815                              <1> ;;	MOV	AL, AH
  1816                              <1> ;;	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1817                              <1> ;;	;IODELAY
  1818                              <1> ;;	STI				; RE-ENABLE INTERRUPTS
  1819                              <1> ;;	POP	eCX  ; 08/02/2015 	; RECOVER COUNT VALUE
  1820                              <1> ;;	POP	eAX  ; 08/02/2015	; RECOVER ADDRESS VALUE
  1821                              <1> ;;	;ADD	AX, CX			; ADD, TEST FOR 64K OVERFLOW
  1822                              <1> ;;	add	ecx, eax ; 08/02/2015
  1823                              <1> ;;	MOV	AL, 2			; MODE FOR 8237
  1824                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1825                              <1> ;;	SIODELAY
  1826                              <1> ;;	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1827                              <1> ;;	;JNC	short NO_BAD		; CHECK FOR ERROR
  1828                              <1> ;;	jc	short dma_bnd_err ; 08/02/2015
  1829                              <1> ;;	and	ecx, 0FFF00000h ; 16 MB limit
  1830                              <1> ;;	jz	short NO_BAD
  1831                              <1> ;;dma_bnd_err:
  1832                              <1> ;;	MOV	byte [DSKETTE_STATUS], DMA_BOUNDARY ; SET ERROR
  1833                              <1> ;;NO_BAD:
  1834                              <1> ;;	RETn				; CY SET BY ABOVE IF ERROR
  1835                              <1> 
  1836                              <1> ;-------------------------------------------------------------------------------
  1837                              <1> ; FMTDMA_SET
  1838                              <1> ;	THIS ROUTINE SETS UP THE DMA CONTROLLER FOR A FORMAT OPERATION.
  1839                              <1> ;
  1840                              <1> ; ON ENTRY:	NOTHING REQUIRED
  1841                              <1> ;
  1842                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1843                              <1> ;-------------------------------------------------------------------------------
  1844                              <1> 
  1845                              <1> FMTDMA_SET:
  1846                              <1> ;; 20/02/2015 modification	
  1847 00004BD9 8B5504              <1> 	mov	edx, [ebp+4] 		; Buffer address
  1848 00004BDC F7C20000F0FF        <1> 	test	edx, 0FFF00000h		; 16 MB limit
  1849 00004BE2 75EC                <1> 	jnz	short dma_bnd_err_stc
  1850                              <1> 	;
  1851 00004BE4 6652                <1> 	push	dx			; *
  1852 00004BE6 B204                <1> 	mov	DL, 4			; SECTORS/TRACK VALUE IN PARM TABLE
  1853 00004BE8 E8D0020000          <1> 	call	GET_PARM		; "
  1854 00004BED 88E0                <1> 	mov	al, ah			; AL = SECTORS/TRACK VALUE
  1855 00004BEF 28E4                <1> 	sub	ah, ah			; AX = SECTORS/TRACK VALUE
  1856 00004BF1 66C1E002            <1> 	shl	ax, 2			; AX = SEC/TRK * 4 (OFFSET C,H,R,N)
  1857 00004BF5 6648                <1> 	dec	ax			; -1 FOR DMA VALUE
  1858 00004BF7 6689C1              <1> 	mov	cx, ax
  1859 00004BFA 665A                <1> 	pop	dx			; *
  1860 00004BFC 6601CA              <1> 	add	dx, cx			; check for overflow
  1861 00004BFF 72D0                <1> 	jc	short dma_bnd_err
  1862                              <1> 	;
  1863 00004C01 6629CA              <1> 	sub	dx, cx			; Restore start address
  1864                              <1> 	;
  1865 00004C04 B04A                <1> 	MOV	AL, 04AH		; WILL WRITE TO THE DISKETTE
  1866 00004C06 FA                  <1> 	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1867 00004C07 E60C                <1> 	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1868                              <1> 	IODELAY				; WAIT FOR I/O
  1868 00004C09 EB00                <2>  jmp short $+2
  1868 00004C0B EB00                <2>  jmp short $+2
  1869 00004C0D E60B                <1> 	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1870 00004C0F 89D0                <1> 	mov	eax, edx		; Buffer address
  1871 00004C11 E604                <1> 	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1872                              <1> 	IODELAY				; WAIT FOR I/O
  1872 00004C13 EB00                <2>  jmp short $+2
  1872 00004C15 EB00                <2>  jmp short $+2
  1873 00004C17 88E0                <1> 	MOV	AL,AH
  1874 00004C19 E604                <1> 	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1875 00004C1B C1E810              <1> 	shr	eax, 16
  1876                              <1> 	IODELAY				; I/O WAIT STATE
  1876 00004C1E EB00                <2>  jmp short $+2
  1876 00004C20 EB00                <2>  jmp short $+2
  1877 00004C22 E681                <1> 	OUT	081H,AL			; OUTPUT highest BITS TO PAGE REGISTER
  1878                              <1> 	IODELAY
  1878 00004C24 EB00                <2>  jmp short $+2
  1878 00004C26 EB00                <2>  jmp short $+2
  1879 00004C28 6689C8              <1> 	mov	ax, cx			; Byte count - 1
  1880 00004C2B E605                <1> 	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1881                              <1> 	IODELAY				; WAIT FOR I/O
  1881 00004C2D EB00                <2>  jmp short $+2
  1881 00004C2F EB00                <2>  jmp short $+2
  1882 00004C31 88E0                <1> 	MOV	AL, AH
  1883 00004C33 E605                <1> 	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1884                              <1> 	IODELAY
  1884 00004C35 EB00                <2>  jmp short $+2
  1884 00004C37 EB00                <2>  jmp short $+2
  1885 00004C39 FB                  <1> 	STI				; RE-ENABLE INTERRUPTS
  1886 00004C3A B002                <1> 	MOV	AL, 2			; MODE FOR 8237
  1887 00004C3C E60A                <1> 	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1888 00004C3E C3                  <1> 	retn
  1889                              <1> 
  1890                              <1> ;; 08/02/2015 - Protected Mode Modification
  1891                              <1> ;;	MOV	AL, 04AH		; WILL WRITE TO THE DISKETTE
  1892                              <1> ;;	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1893                              <1> ;;	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1894                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1895                              <1> ;;	IODELAY
  1896                              <1> ;;	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1897                              <1> ;;	;MOV	AX,ES			; GET THE ES VALUE
  1898                              <1> ;;	;ROL	AX,4			; ROTATE LEFT
  1899                              <1> ;;	;MOV	CH,AL			; GET HIGHEST NIBBLE OF ES TO CH
  1900                              <1> ;;	;AND	AL,11110000B		; ZERO THE LOW NIBBLE FROM SEGMENT
  1901                              <1> ;;	;ADD	AX,[BP+2]		; TEST FOR CARRY FROM ADDITION
  1902                              <1> ;;	;JNC	short J33A
  1903                              <1> ;;	;INC	CH			; CARRY MEANS HIGH 4 BITS MUST BE INC
  1904                              <1> ;;	mov	eax, [ebp+4] ; 08/02/2015
  1905                              <1> ;;;J33A:
  1906                              <1> ;;	PUSH	eAX ; 08/02/2015	; SAVE START ADDRESS
  1907                              <1> ;;	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1908                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1909                              <1> ;;	IODELAY
  1910                              <1> ;;	MOV	AL,AH
  1911                              <1> ;;	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1912                              <1> ;;	shr 	eax, 16 ; 08/02/2015
  1913                              <1> ;;	;MOV	AL,CH			; GET HIGH 4 BITS
  1914                              <1> ;;	;JMP	$+2			; I/O WAIT STATE
  1915                              <1> ;;	IODELAY
  1916                              <1> ;;	;AND	AL,00001111B
  1917                              <1> ;;	OUT	081H,AL			; OUTPUT HIGH 4 BITS TO PAGE REGISTER
  1918                              <1> ;;
  1919                              <1> ;;;----- DETERMINE COUNT
  1920                              <1> ;;	sub	eax, eax ; 08/02/2015
  1921                              <1> ;;	MOV	DL, 4			; SECTORS/TRACK VALUE IN PARM TABLE
  1922                              <1> ;;	CALL	GET_PARM		; "
  1923                              <1> ;;	XCHG	AL, AH			; AL = SECTORS/TRACK VALUE
  1924                              <1> ;;	SUB	AH, AH			; AX = SECTORS/TRACK VALUE
  1925                              <1> ;;	SHL	AX, 2			; AX = SEC/TRK * 4 (OFFSET C,H,R,N)
  1926                              <1> ;;	DEC	AX			; -1 FOR DMA VALUE
  1927                              <1> ;;	PUSH	eAX 	; 08/02/2015	; SAVE # OF BYTES TO BE TRANSFERED
  1928                              <1> ;;	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1929                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1930                              <1> ;;	IODELAY
  1931                              <1> ;;	MOV	AL, AH
  1932                              <1> ;;	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1933                              <1> ;;	STI				; RE-ENABLE INTERRUPTS
  1934                              <1> ;;	POP	eCX	; 08/02/2015	; RECOVER COUNT VALUE
  1935                              <1> ;;	POP	eAX	; 08/02/2015	; RECOVER ADDRESS VALUE
  1936                              <1> ;;	;ADD	AX, CX			; ADD, TEST FOR 64K OVERFLOW
  1937                              <1> ;;	add	ecx, eax ; 08/02/2015
  1938                              <1> ;;	MOV	AL, 2			; MODE FOR 8237
  1939                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1940                              <1> ;;	SIODELAY
  1941                              <1> ;;	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1942                              <1> ;;	;JNC	short FMTDMA_OK		; CHECK FOR ERROR
  1943                              <1> ;;	jc	short fmtdma_bnd_err ; 08/02/2015
  1944                              <1> ;;	and	ecx, 0FFF00000h  ; 16 MB limit
  1945                              <1> ;;	jz	short FMTDMA_OK
  1946                              <1> ;;	stc	; 20/02/2015
  1947                              <1> ;;fmtdma_bnd_err:
  1948                              <1> ;;	MOV	byte [DSKETTE_STATUS], DMA_BOUNDARY ; SET ERROR
  1949                              <1> ;;FMTDMA_OK:
  1950                              <1> ;;	RETn				; CY SET BY ABOVE IF ERROR
  1951                              <1> 
  1952                              <1> ;-------------------------------------------------------------------------------
  1953                              <1> ; NEC_INIT	
  1954                              <1> ;	THIS ROUTINE SEEKS TO THE REQUESTED TRACK AND INITIALIZES
  1955                              <1> ;	THE NEC FOR THE READ/WRITE/VERIFY/FORMAT OPERATION.
  1956                              <1> ;
  1957                              <1> ; ON ENTRY:	AH = NEC COMMAND TO BE PERFORMED
  1958                              <1> ;
  1959                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1960                              <1> ;-------------------------------------------------------------------------------
  1961                              <1> NEC_INIT:
  1962 00004C3F 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1963 00004C41 E8BC020000          <1> 	CALL	MOTOR_ON		; TURN MOTOR ON FOR SPECIFIC DRIVE
  1964                              <1> 
  1965                              <1> ;-----	DO THE SEEK OPERATION
  1966                              <1> 
  1967 00004C46 8A6D01              <1> 	MOV	CH,[eBP+1]		; CH = TRACK #
  1968 00004C49 E8AF030000          <1> 	CALL	SEEK			; MOVE TO CORRECT TRACK
  1969 00004C4E 6658                <1> 	POP	AX			; RECOVER COMMAND
  1970 00004C50 721E                <1> 	JC	short ER_1		; ERROR ON SEEK
  1971 00004C52 BB[704C0000]        <1> 	MOV	eBX, ER_1		; LOAD ERROR ADDRESS
  1972 00004C57 53                  <1> 	PUSH	eBX			; PUSH NEC_OUT ERROR RETURN
  1973                              <1> 
  1974                              <1> ;-----	SEND OUT THE PARAMETERS TO THE CONTROLLER
  1975                              <1> 
  1976 00004C58 E866030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE OPERATION COMMAND
  1977 00004C5D 6689F0              <1> 	MOV	AX,SI			; AH = HEAD #
  1978 00004C60 89FB                <1> 	MOV	eBX,eDI			; BL = DRIVE #
  1979 00004C62 C0E402              <1> 	SAL	AH,2			; MOVE IT TO BIT 2
  1980 00004C65 80E404              <1> 	AND	AH,00000100B		; ISOLATE THAT BIT
  1981 00004C68 08DC                <1> 	OR	AH,BL			; OR IN THE DRIVE NUMBER
  1982 00004C6A E854030000          <1> 	CALL	NEC_OUTPUT		; FALL THRU CY SET IF ERROR
  1983 00004C6F 5B                  <1> 	POP	eBX			; THROW AWAY ERROR RETURN
  1984                              <1> ER_1:
  1985 00004C70 C3                  <1> 	RETn
  1986                              <1> 
  1987                              <1> ;-------------------------------------------------------------------------------
  1988                              <1> ; RWV_COM
  1989                              <1> ;	THIS ROUTINE SENDS PARAMETERS TO THE NEC SPECIFIC TO THE 
  1990                              <1> ;	READ/WRITE/VERIFY OPERATIONS.
  1991                              <1> ;
  1992                              <1> ; ON ENTRY:	CS:BX = ADDRESS OF MEDIA/DRIVE PARAMETER TABLE
  1993                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1994                              <1> ;-------------------------------------------------------------------------------
  1995                              <1> RWV_COM:
  1996 00004C71 B8[BC4C0000]        <1> 	MOV	eAX, ER_2		; LOAD ERROR ADDRESS
  1997 00004C76 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1998 00004C77 8A6501              <1> 	MOV	AH,[eBP+1]		; OUTPUT TRACK #
  1999 00004C7A E844030000          <1> 	CALL	NEC_OUTPUT
  2000 00004C7F 6689F0              <1> 	MOV	AX,SI			; OUTPUT HEAD #
  2001 00004C82 E83C030000          <1> 	CALL	NEC_OUTPUT
  2002 00004C87 8A6500              <1>         MOV     AH,[eBP]                ; OUTPUT SECTOR #
  2003 00004C8A E834030000          <1> 	CALL	NEC_OUTPUT
  2004 00004C8F B203                <1> 	MOV	DL,3			; BYTES/SECTOR PARAMETER FROM BLOCK
  2005 00004C91 E827020000          <1> 	CALL	GET_PARM 		; ... TO THE NEC
  2006 00004C96 E828030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  2007 00004C9B B204                <1> 	MOV	DL,4			; EOT PARAMETER FROM BLOCK
  2008 00004C9D E81B020000          <1> 	CALL	GET_PARM 		; ... TO THE NEC
  2009 00004CA2 E81C030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  2010 00004CA7 8A6305              <1>         MOV     AH, [eBX+MD.GAP]        ; GET GAP LENGTH
  2011                              <1> _R15:
  2012 00004CAA E814030000          <1> 	CALL	NEC_OUTPUT
  2013 00004CAF B206                <1> 	MOV	DL,6			; DTL PARAMETER PROM BLOCK
  2014 00004CB1 E807020000          <1> 	CALL	GET_PARM		;  TO THE NEC
  2015 00004CB6 E808030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  2016 00004CBB 58                  <1> 	POP	eAX			; THROW AWAY ERROR EXIT
  2017                              <1> ER_2:
  2018 00004CBC C3                  <1> 	RETn
  2019                              <1> 
  2020                              <1> ;-------------------------------------------------------------------------------
  2021                              <1> ; NEC_TERM
  2022                              <1> ;	THIS ROUTINE WAITS FOR THE OPERATION THEN ACCEPTS THE STATUS 
  2023                              <1> ;	FROM THE NEC FOR THE READ/WRITE/VERIFY/FORWAT OPERATION.
  2024                              <1> ;
  2025                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  2026                              <1> ;-------------------------------------------------------------------------------
  2027                              <1> NEC_TERM:
  2028                              <1> 
  2029                              <1> ;-----	LET THE OPERATION HAPPEN
  2030                              <1> 
  2031 00004CBD 56                  <1> 	PUSH	eSI			; SAVE HEAD #, # OF SECTORS
  2032 00004CBE E80D040000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
  2033 00004CC3 9C                  <1> 	PUSHF
  2034 00004CC4 E837040000          <1> 	CALL	RESULTS			; GET THE NEC STATUS
  2035 00004CC9 724B                <1> 	JC	short SET_END_POP
  2036 00004CCB 9D                  <1> 	POPF
  2037 00004CCC 723E                <1> 	JC	short SET_END		; LOOK FOR ERROR
  2038                              <1> 
  2039                              <1> ;-----	CHECK THE RESULTS RETURNED BY THE CONTROLLER
  2040                              <1> 
  2041 00004CCE FC                  <1> 	CLD				; SET THE CORRECT DIRECTION
  2042 00004CCF BE[19820100]        <1> 	MOV	eSI, NEC_STATUS		; POINT TO STATUS FIELD
  2043 00004CD4 AC                  <1> 	lodsb				; GET ST0
  2044 00004CD5 24C0                <1> 	AND	AL,11000000B		; TEST FOR NORMAL TERMINATION
  2045 00004CD7 7433                <1> 	JZ	short SET_END
  2046 00004CD9 3C40                <1> 	CMP	AL,01000000B		; TEST FOR ABNORMAL TERMINATION
  2047 00004CDB 7527                <1> 	JNZ	short J18		; NOT ABNORMAL, BAD NEC
  2048                              <1> 
  2049                              <1> ;-----	ABNORMAL TERMINATION, FIND OUT WHY
  2050                              <1> 
  2051 00004CDD AC                  <1> 	lodsb				; GET ST1
  2052 00004CDE D0E0                <1> 	SAL	AL,1			; TEST FOR EDT FOUND
  2053 00004CE0 B404                <1> 	MOV	AH,RECORD_NOT_FND
  2054 00004CE2 7222                <1> 	JC	short J19
  2055 00004CE4 C0E002              <1> 	SAL	AL,2
  2056 00004CE7 B410                <1> 	MOV	AH,BAD_CRC
  2057 00004CE9 721B                <1> 	JC	short J19
  2058 00004CEB D0E0                <1> 	SAL	AL,1			; TEST FOR DMA OVERRUN
  2059 00004CED B408                <1> 	MOV	AH,BAD_DMA
  2060 00004CEF 7215                <1> 	JC	short J19
  2061 00004CF1 C0E002              <1> 	SAL	AL,2			; TEST FOR RECORD NOT FOUND
  2062 00004CF4 B404                <1> 	MOV	AH,RECORD_NOT_FND
  2063 00004CF6 720E                <1> 	JC	short J19
  2064 00004CF8 D0E0                <1> 	SAL	AL,1
  2065 00004CFA B403                <1> 	MOV	AH,WRITE_PROTECT	; TEST FOR WRITE_PROTECT
  2066 00004CFC 7208                <1> 	JC	short J19
  2067 00004CFE D0E0                <1> 	SAL	AL,1			; TEST MISSING ADDRESS MARK
  2068 00004D00 B402                <1> 	MOV	AH,BAD_ADDR_MARK
  2069 00004D02 7202                <1> 	JC	short J19
  2070                              <1> 
  2071                              <1> ;----- 	NEC MUST HAVE FAILED
  2072                              <1> J18:
  2073 00004D04 B420                <1> 	MOV	AH,BAD_NEC
  2074                              <1> J19:
  2075 00004D06 0825[18820100]      <1> 	OR	[DSKETTE_STATUS], AH
  2076                              <1> SET_END:
  2077 00004D0C 803D[18820100]01    <1> 	CMP	byte [DSKETTE_STATUS], 1 ; SET ERROR CONDITION
  2078 00004D13 F5                  <1> 	CMC
  2079 00004D14 5E                  <1> 	POP	eSI
  2080 00004D15 C3                  <1> 	RETn				; RESTORE HEAD #, # OF SECTORS
  2081                              <1> 
  2082                              <1> SET_END_POP:
  2083 00004D16 9D                  <1> 	POPF
  2084 00004D17 EBF3                <1> 	JMP	SHORT SET_END
  2085                              <1> 
  2086                              <1> ;-------------------------------------------------------------------------------
  2087                              <1> ; DSTATE:	ESTABLISH STATE UPON SUCCESSFUL OPERATION.
  2088                              <1> ;-------------------------------------------------------------------------------
  2089                              <1> DSTATE:
  2090 00004D19 803D[18820100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; CHECK FOR ERROR
  2091 00004D20 753E                <1> 	JNZ	short SETBAC		    ; IF ERROR JUMP
  2092 00004D22 808F[25820100]10    <1> 	OR	byte [DSK_STATE+eDI],MED_DET ; NO ERROR, MARK MEDIA AS DETERMINED
  2093 00004D29 F687[25820100]04    <1> 	TEST	byte [DSK_STATE+eDI],DRV_DET ; DRIVE DETERMINED ?
  2094 00004D30 752E                <1> 	JNZ	short SETBAC		; IF DETERMINED NO TRY TO DETERMINE
  2095 00004D32 8A87[25820100]      <1> 	MOV	AL,[DSK_STATE+eDI]	; LOAD STATE
  2096 00004D38 24C0                <1> 	AND	AL,RATE_MSK		; KEEP ONLY RATE
  2097 00004D3A 3C80                <1> 	CMP	AL,RATE_250		; RATE 250 ?
  2098 00004D3C 751B                <1> 	JNE	short M_12		; NO, MUST BE 1.2M OR 1.44M DRIVE
  2099                              <1> 
  2100                              <1> ;----- 	CHECK IF IT IS 1.44M
  2101                              <1> 
  2102 00004D3E E871010000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN (AL)
  2103                              <1> 	;;20/02/2015
  2104                              <1> 	;;JC	short M_12		; CMOS BAD
  2105 00004D43 7414                <1> 	jz	short M_12 ;; 20/02/2015
  2106 00004D45 3C04                <1> 	CMP	AL, 4			; 1.44MB DRIVE ?
  2107 00004D47 7410                <1> 	JE	short M_12		; YES
  2108                              <1> M_720:
  2109 00004D49 80A7[25820100]FD    <1> 	AND	byte [DSK_STATE+eDI], ~FMT_CAPA ; TURN OFF FORMAT CAPABILITY
  2110 00004D50 808F[25820100]04    <1> 	OR	byte [DSK_STATE+eDI],DRV_DET  ; MARK DRIVE DETERMINED
  2111 00004D57 EB07                <1> 	JMP	SHORT SETBAC		; BACK
  2112                              <1> M_12:	
  2113 00004D59 808F[25820100]06    <1> 	OR	byte [DSK_STATE+eDI],DRV_DET+FMT_CAPA 
  2114                              <1> 					; TURN ON DETERMINED & FMT CAPA
  2115                              <1> SETBAC:
  2116 00004D60 C3                  <1> 	RETn
  2117                              <1> 
  2118                              <1> ;-------------------------------------------------------------------------------
  2119                              <1> ; RETRY	
  2120                              <1> ;	DETERMINES WHETHER A RETRY IS NECESSARY. 
  2121                              <1> ;	IF RETRY IS REQUIRED THEN STATE INFORMATION IS UPDATED FOR RETRY.
  2122                              <1> ;
  2123                              <1> ; ON EXIT:	CY = 1 FOR RETRY, CY = 0 FOR NO RETRY
  2124                              <1> ;-------------------------------------------------------------------------------
  2125                              <1> RETRY:
  2126 00004D61 803D[18820100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; GET STATUS OF OPERATION
  2127 00004D68 7445                <1> 	JZ	short NO_RETRY		; SUCCESSFUL OPERATION
  2128 00004D6A 803D[18820100]80    <1> 	CMP	byte [DSKETTE_STATUS],TIME_OUT ; IF TIME OUT NO RETRY
  2129 00004D71 743C                <1> 	JZ	short NO_RETRY
  2130 00004D73 8AA7[25820100]      <1> 	MOV	AH,[DSK_STATE+eDI]	; GET MEDIA STATE OF DRIVE
  2131 00004D79 F6C410              <1> 	TEST	AH,MED_DET		; ESTABLISHED/DETERMINED ?
  2132 00004D7C 7531                <1> 	JNZ	short NO_RETRY		; IF ESTABLISHED STATE THEN TRUE ERROR
  2133 00004D7E 80E4C0              <1> 	AND	AH,RATE_MSK		; ISOLATE RATE
  2134 00004D81 8A2D[20820100]      <1> 	MOV	CH,[LASTRATE]		; GET START OPERATION STATE
  2135 00004D87 C0C504              <1> 	ROL	CH,4			; TO CORRESPONDING BITS
  2136 00004D8A 80E5C0              <1> 	AND	CH,RATE_MSK		; ISOLATE RATE BITS
  2137 00004D8D 38E5                <1> 	CMP	CH,AH			; ALL RATES TRIED
  2138 00004D8F 741E                <1> 	JE	short NO_RETRY		; IF YES, THEN TRUE ERROR
  2139                              <1> 
  2140                              <1> ;	SETUP STATE INDICATOR FOR RETRY ATTEMPT TO NEXT RATE
  2141                              <1> ;	 00000000B (500) -> 10000000B	(250)
  2142                              <1> ;	 10000000B (250) -> 01000000B	(300)
  2143                              <1> ;	 01000000B (300) -> 00000000B	(500)
  2144                              <1> 
  2145 00004D91 80FC01              <1> 	CMP	AH,RATE_500+1		; SET CY FOR RATE 500
  2146 00004D94 D0DC                <1> 	RCR	AH,1			; TO NEXT STATE
  2147 00004D96 80E4C0              <1> 	AND	AH,RATE_MSK		; KEEP ONLY RATE BITS
  2148 00004D99 80A7[25820100]1F    <1> 	AND	byte [DSK_STATE+eDI], ~(RATE_MSK+DBL_STEP)
  2149                              <1> 					; RATE, DBL STEP OFF
  2150 00004DA0 08A7[25820100]      <1> 	OR	[DSK_STATE+eDI],AH	; TURN ON NEW RATE
  2151 00004DA6 C605[18820100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; RESET STATUS FOR RETRY
  2152 00004DAD F9                  <1> 	STC				; SET CARRY FOR RETRY
  2153 00004DAE C3                  <1> 	RETn				; RETRY RETURN
  2154                              <1> 
  2155                              <1> NO_RETRY:
  2156 00004DAF F8                  <1> 	CLC				; CLEAR CARRY NO RETRY
  2157 00004DB0 C3                  <1> 	RETn				; NO RETRY RETURN
  2158                              <1> 
  2159                              <1> ;-------------------------------------------------------------------------------
  2160                              <1> ; NUM_TRANS
  2161                              <1> ;	THIS ROUTINE CALCULATES THE NUMBER OF SECTORS THAT WERE
  2162                              <1> ;	ACTUALLY TRANSFERRED TO/FROM THE DISKETTE.
  2163                              <1> ;
  2164                              <1> ; ON ENTRY:	[BP+1] = TRACK
  2165                              <1> ;		SI-HI  = HEAD
  2166                              <1> ;		[BP]   = START SECTOR
  2167                              <1> ;
  2168                              <1> ; ON EXIT:	AL = NUMBER ACTUALLY TRANSFERRED
  2169                              <1> ;-------------------------------------------------------------------------------
  2170                              <1> NUM_TRANS:
  2171 00004DB1 30C0                <1> 	XOR	AL,AL			; CLEAR FOR ERROR
  2172 00004DB3 803D[18820100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; CHECK FOR ERROR
  2173 00004DBA 752C                <1> 	JNZ	NT_OUT			; IF ERROR 0 TRANSFERRED
  2174 00004DBC B204                <1> 	MOV	DL,4			; SECTORS/TRACK OFFSET TO DL
  2175 00004DBE E8FA000000          <1> 	CALL	GET_PARM		; AH = SECTORS/TRACK
  2176 00004DC3 8A1D[1E820100]      <1> 	MOV	BL, [NEC_STATUS+5]	; GET ENDING SECTOR
  2177 00004DC9 6689F1              <1> 	MOV	CX,SI			; CH = HEAD # STARTED
  2178 00004DCC 3A2D[1D820100]      <1> 	CMP	CH, [NEC_STATUS+4]	; GET HEAD ENDED UP ON
  2179 00004DD2 750D                <1> 	JNZ	DIF_HD			; IF ON SAME HEAD, THEN NO ADJUST
  2180 00004DD4 8A2D[1C820100]      <1> 	MOV	CH, [NEC_STATUS+3]	; GET TRACK ENDED UP ON
  2181 00004DDA 3A6D01              <1> 	CMP	CH,[eBP+1]		; IS IT ASKED FOR TRACK
  2182 00004DDD 7404                <1> 	JZ	short SAME_TRK		; IF SAME TRACK NO INCREASE
  2183 00004DDF 00E3                <1> 	ADD	BL,AH			; ADD SECTORS/TRACK
  2184                              <1> DIF_HD:
  2185 00004DE1 00E3                <1> 	ADD	BL,AH			; ADD SECTORS/TRACK
  2186                              <1> SAME_TRK:
  2187 00004DE3 2A5D00              <1> 	SUB	BL,[eBP]		; SUBTRACT START FROM END
  2188 00004DE6 88D8                <1> 	MOV	AL,BL			; TO AL
  2189                              <1> NT_OUT:
  2190 00004DE8 C3                  <1> 	RETn
  2191                              <1> 
  2192                              <1> ;-------------------------------------------------------------------------------
  2193                              <1> ; SETUP_END
  2194                              <1> ;	RESTORES @MOTOR_COUNT TO PARAMETER PROVIDED IN TABLE 
  2195                              <1> ;	AND LOADS @DSKETTE_STATUS TO AH, AND SETS CY.
  2196                              <1> ;
  2197                              <1> ; ON EXIT:
  2198                              <1> ;	AH, @DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  2199                              <1> ;-------------------------------------------------------------------------------
  2200                              <1> SETUP_END:
  2201 00004DE9 B202                <1> 	MOV	DL,2			; GET THE MOTOR WAIT PARAMETER
  2202 00004DEB 6650                <1> 	PUSH	AX			; SAVE NUMBER TRANSFERRED
  2203 00004DED E8CB000000          <1> 	CALL	GET_PARM
  2204 00004DF2 8825[17820100]      <1> 	MOV	[MOTOR_COUNT],AH	; STORE UPON RETURN
  2205 00004DF8 6658                <1> 	POP	AX			; RESTORE NUMBER TRANSFERRED
  2206 00004DFA 8A25[18820100]      <1> 	MOV	AH, [DSKETTE_STATUS]	; GET STATUS OF OPERATION
  2207 00004E00 08E4                <1> 	OR	AH,AH			; CHECK FOR ERROR
  2208 00004E02 7402                <1> 	JZ	short NUN_ERR		; NO ERROR
  2209 00004E04 30C0                <1> 	XOR	AL,AL			; CLEAR NUMBER RETURNED
  2210                              <1> NUN_ERR: 
  2211 00004E06 80FC01              <1> 	CMP	AH,1			; SET THE CARRY FLAG TO INDICATE
  2212 00004E09 F5                  <1> 	CMC				; SUCCESS OR FAILURE
  2213 00004E0A C3                  <1> 	RETn
  2214                              <1> 
  2215                              <1> ;-------------------------------------------------------------------------------
  2216                              <1> ; SETUP_DBL
  2217                              <1> ;	CHECK DOUBLE STEP.
  2218                              <1> ;
  2219                              <1> ; ON ENTRY :	DI = DRIVE
  2220                              <1> ;
  2221                              <1> ; ON EXIT :	CY = 1 MEANS ERROR
  2222                              <1> ;-------------------------------------------------------------------------------
  2223                              <1> SETUP_DBL:
  2224 00004E0B 8AA7[25820100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; ACCESS STATE
  2225 00004E11 F6C410              <1> 	TEST	AH,MED_DET		; ESTABLISHED STATE ?
  2226 00004E14 757E                <1> 	JNZ	short NO_DBL			; IF ESTABLISHED THEN DOUBLE DONE
  2227                              <1> 
  2228                              <1> ;-----	CHECK FOR TRACK 0 TO SPEED UP ACKNOWLEDGE OF UNFORMATTED DISKETTE
  2229                              <1> 
  2230 00004E16 C605[15820100]00    <1> 	MOV	byte [SEEK_STATUS],0	; SET RECALIBRATE REQUIRED ON ALL DRIVES
  2231 00004E1D E8E0000000          <1> 	CALL	MOTOR_ON		; ENSURE MOTOR STAY ON
  2232 00004E22 B500                <1> 	MOV	CH,0			; LOAD TRACK 0
  2233 00004E24 E8D4010000          <1> 	CALL	SEEK			; SEEK TO TRACK 0
  2234 00004E29 E868000000          <1> 	CALL	READ_ID			; READ ID FUNCTION
  2235 00004E2E 7249                <1> 	JC	short SD_ERR		; IF ERROR NO TRACK 0
  2236                              <1> 
  2237                              <1> ;-----	INITIALIZE START AND MAX TRACKS (TIMES 2 FOR BOTH HEADS)
  2238                              <1> 
  2239 00004E30 66B95004            <1> 	MOV	CX,0450H 		; START, MAX TRACKS
  2240 00004E34 F687[25820100]01    <1> 	TEST	byte [DSK_STATE+eDI],TRK_CAPA ; TEST FOR 80 TRACK CAPABILITY
  2241 00004E3B 7402                <1> 	JZ	short CNT_OK		; IF NOT COUNT IS SETUP
  2242 00004E3D B1A0                <1> 	MOV	CL,0A0H			; MAXIMUM TRACK 1.2 MB
  2243                              <1> 
  2244                              <1> ;	ATTEMPT READ ID OF ALL TRACKS, ALL HEADS UNTIL SUCCESS; UPON SUCCESS,
  2245                              <1> ;	MUST SEE IF ASKED FOR TRACK IN SINGLE STEP MODE = TRACK ID READ; IF NOT
  2246                              <1> ;	THEN SET DOUBLE STEP ON.
  2247                              <1> 
  2248                              <1> CNT_OK:
  2249 00004E3F C605[17820100]FF    <1>         MOV     byte [MOTOR_COUNT], 0FFH ; ENSURE MOTOR STAYS ON FOR OPERATION 
  2250 00004E46 6651                <1> 	PUSH	CX			; SAVE TRACK, COUNT
  2251 00004E48 C605[18820100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; CLEAR STATUS, EXPECT ERRORS
  2252 00004E4F 6631C0              <1> 	XOR	AX,AX			; CLEAR AX
  2253 00004E52 D0ED                <1> 	SHR	CH,1			; HALVE TRACK, CY = HEAD
  2254 00004E54 C0D003              <1> 	RCL	AL,3			; AX = HEAD IN CORRECT BIT
  2255 00004E57 6650                <1> 	PUSH	AX			; SAVE HEAD
  2256 00004E59 E89F010000          <1> 	CALL	SEEK			; SEEK TO TRACK
  2257 00004E5E 6658                <1> 	POP	AX			; RESTORE HEAD
  2258 00004E60 6609C7              <1> 	OR	DI,AX			; DI = HEAD OR'ED DRIVE
  2259 00004E63 E82E000000          <1> 	CALL	READ_ID			; READ ID HEAD 0
  2260 00004E68 9C                  <1> 	PUSHF				; SAVE RETURN FROM READ_ID
  2261 00004E69 6681E7FB00          <1> 	AND	DI,11111011B		; TURN OFF HEAD 1 BIT
  2262 00004E6E 9D                  <1> 	POPF				; RESTORE ERROR RETURN
  2263 00004E6F 6659                <1> 	POP	CX			; RESTORE COUNT
  2264 00004E71 7308                <1> 	JNC	short DO_CHK		; IF OK, ASKED = RETURNED TRACK ?
  2265 00004E73 FEC5                <1> 	INC	CH			; INC FOR NEXT TRACK
  2266 00004E75 38CD                <1> 	CMP	CH,CL			; REACHED MAXIMUM YET
  2267 00004E77 75C6                <1> 	JNZ	short CNT_OK		; CONTINUE TILL ALL TRIED
  2268                              <1> 
  2269                              <1> ;-----	FALL THRU, READ ID FAILED FOR ALL TRACKS
  2270                              <1> 
  2271                              <1> SD_ERR:	
  2272 00004E79 F9                  <1> 	STC				; SET CARRY FOR ERROR
  2273 00004E7A C3                  <1> 	RETn				; SETUP_DBL ERROR EXIT
  2274                              <1> 
  2275                              <1> DO_CHK:
  2276 00004E7B 8A0D[1C820100]      <1> 	MOV	CL, [NEC_STATUS+3]	; LOAD RETURNED TRACK
  2277 00004E81 888F[29820100]      <1> 	MOV	[DSK_TRK+eDI], CL	; STORE TRACK NUMBER
  2278 00004E87 D0ED                <1> 	SHR	CH,1			; HALVE TRACK
  2279 00004E89 38CD                <1> 	CMP	CH,CL			; IS IT THE SAME AS ASKED FOR TRACK
  2280 00004E8B 7407                <1> 	JZ	short NO_DBL		; IF SAME THEN NO DOUBLE STEP
  2281 00004E8D 808F[25820100]20    <1> 	OR	byte [DSK_STATE+eDI],DBL_STEP ; TURN ON DOUBLE STEP REQUIRED
  2282                              <1> NO_DBL:
  2283 00004E94 F8                  <1> 	CLC				; CLEAR ERROR FLAG
  2284 00004E95 C3                  <1> 	RETn
  2285                              <1> 
  2286                              <1> ;-------------------------------------------------------------------------------
  2287                              <1> ; READ_ID
  2288                              <1> ;	READ ID FUNCTION.
  2289                              <1> ;
  2290                              <1> ; ON ENTRY:	DI : BIT 2 = HEAD; BITS 1,0 = DRIVE
  2291                              <1> ;
  2292                              <1> ; ON EXIT: 	DI : BIT 2 IS RESET, BITS 1,0 = DRIVE
  2293                              <1> ;		@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  2294                              <1> ;-------------------------------------------------------------------------------
  2295                              <1> READ_ID:
  2296 00004E96 B8[B34E0000]        <1> 	MOV	eAX, ER_3		; MOVE NEC OUTPUT ERROR ADDRESS
  2297 00004E9B 50                  <1> 	PUSH	eAX
  2298 00004E9C B44A                <1> 	MOV	AH,4AH			; READ ID COMMAND
  2299 00004E9E E820010000          <1> 	CALL	NEC_OUTPUT		; TO CONTROLLER
  2300 00004EA3 6689F8              <1> 	MOV	AX,DI			; DRIVE # TO AH, HEAD 0
  2301 00004EA6 88C4                <1> 	MOV	AH,AL
  2302 00004EA8 E816010000          <1> 	CALL	NEC_OUTPUT		; TO CONTROLLER
  2303 00004EAD E80BFEFFFF          <1> 	CALL	NEC_TERM		; WAIT FOR OPERATION, GET STATUS
  2304 00004EB2 58                  <1> 	POP	eAX			; THROW AWAY ERROR ADDRESS
  2305                              <1> ER_3:
  2306 00004EB3 C3                  <1> 	RETn
  2307                              <1> 
  2308                              <1> ;-------------------------------------------------------------------------------
  2309                              <1> ; CMOS_TYPE
  2310                              <1> ;	RETURNS DISKETTE TYPE FROM CMOS
  2311                              <1> ;
  2312                              <1> ; ON ENTRY:	DI = DRIVE #
  2313                              <1> ;
  2314                              <1> ; ON EXIT:	AL = TYPE; CY REFLECTS STATUS
  2315                              <1> ;-------------------------------------------------------------------------------
  2316                              <1> 
  2317                              <1> CMOS_TYPE: ; 11/12/2014
  2318 00004EB4 8A87[EE6D0000]      <1> mov	al, [eDI+fd0_type]
  2319 00004EBA 20C0                <1> and 	al, al ; 18/12/2014
  2320 00004EBC C3                  <1> retn
  2321                              <1> 
  2322                              <1> ;CMOS_TYPE:
  2323                              <1> ;	MOV	AL, CMOS_DIAG		; CMOS DIAGNOSTIC STATUS BYTE ADDRESS
  2324                              <1> ;	CALL	CMOS_READ		; GET CMOS STATUS
  2325                              <1> ;	TEST	AL,BAD_BAT+BAD_CKSUM	; BATTERY GOOD AND CHECKSUM VALID
  2326                              <1> ;	STC				; SET CY = 1 INDICATING ERROR FOR RETURN
  2327                              <1> ;	JNZ	short BAD_CM		; ERROR IF EITHER BIT ON
  2328                              <1> ;	MOV	AL,CMOS_DISKETTE	; ADDRESS OF DISKETTE BYTE IN CMOS
  2329                              <1> ;	CALL	CMOS_READ		; GET DISKETTE BYTE
  2330                              <1> ;	OR	DI,DI			; SEE WHICH DRIVE IN QUESTION
  2331                              <1> ;	JNZ	short TB		; IF DRIVE 1, DATA IN LOW NIBBLE
  2332                              <1> ;	ROR	AL,4			; EXCHANGE NIBBLES IF SECOND DRIVE
  2333                              <1> ;TB:
  2334                              <1> ;	AND	AL,0FH			; KEEP ONLY DRIVE DATA, RESET CY, 0
  2335                              <1> ;BAD_CM:
  2336                              <1> ;	RETn				; CY, STATUS OF READ
  2337                              <1> 
  2338                              <1> ;-------------------------------------------------------------------------------
  2339                              <1> ; GET_PARM
  2340                              <1> ;	THIS ROUTINE FETCHES THE INDEXED POINTER FROM THE DISK_BASE
  2341                              <1> ;	BLOCK POINTED TO BY THE DATA VARIABLE @DISK_POINTER. A BYTE FROM
  2342                              <1> ;	THAT TABLE IS THEN MOVED INTO AH, THE INDEX OF THAT BYTE BEING
  2343                              <1> ;	THE PARAMETER IN DL.
  2344                              <1> ;
  2345                              <1> ; ON ENTRY:	DL = INDEX OF BYTE TO BE FETCHED
  2346                              <1> ;
  2347                              <1> ; ON EXIT:	AH = THAT BYTE FROM BLOCK
  2348                              <1> ;		AL,DH DESTROYED
  2349                              <1> ;-------------------------------------------------------------------------------
  2350                              <1> GET_PARM:
  2351                              <1> 	;PUSH	DS
  2352 00004EBD 56                  <1> 	PUSH	eSI
  2353                              <1>     	;SUB	AX,AX			; DS = 0, BIOS DATA AREA
  2354                              <1>     	;MOV	DS,AX
  2355                              <1> 	;;mov	ax, cs
  2356                              <1> 	;;mov	ds, ax
  2357                              <1> 	; 08/02/2015 (protected mode modifications, bx -> ebx)
  2358 00004EBE 87D3                <1> 	XCHG	eDX,eBX			; BL = INDEX
  2359                              <1> 	;SUB	BH,BH			; BX = INDEX
  2360 00004EC0 81E3FF000000        <1> 	and	ebx, 0FFh
  2361                              <1>     	;LDS	SI, [DISK_POINTER]	; POINT TO BLOCK
  2362                              <1> 	;
  2363                              <1> 	; 17/12/2014
  2364 00004EC6 66A1[DD6D0000]      <1> 	mov	ax, [cfd] ; current (AL) and previous fd (AH)
  2365 00004ECC 38E0                <1> 	cmp	al, ah
  2366 00004ECE 7425                <1> 	je	short gpndc
  2367 00004ED0 A2[DE6D0000]        <1> 	mov	[pfd], al ; current drive -> previous drive
  2368 00004ED5 53                  <1> 	push	ebx ; 08/02/2015
  2369 00004ED6 88C3                <1> 	mov	bl, al 
  2370                              <1> 	; 11/12/2014
  2371 00004ED8 8A83[EE6D0000]      <1> 	mov	al, [eBX+fd0_type]	; Drive type (0,1,2,3,4)
  2372                              <1> 	; 18/12/2014
  2373 00004EDE 20C0                <1> 	and	al, al
  2374 00004EE0 7507                <1> 	jnz	short gpdtc
  2375 00004EE2 BB[C76D0000]        <1> 	mov	ebx, MD_TBL6		; 1.44 MB param. tbl. (default)
  2376 00004EE7 EB05                <1>         jmp     short gpdpu
  2377                              <1> gpdtc:	
  2378 00004EE9 E817F9FFFF          <1> 	call	DR_TYPE_CHECK
  2379                              <1> 	; cf = 1 -> eBX points to 1.44MB fd parameter table (default)
  2380                              <1> gpdpu:
  2381 00004EEE 891D[646D0000]      <1> 	mov	[DISK_POINTER], ebx
  2382 00004EF4 5B                  <1> 	pop	ebx
  2383                              <1> gpndc:
  2384 00004EF5 8B35[646D0000]      <1> 	mov	esi, [DISK_POINTER] ; 08/02/2015, si -> esi
  2385 00004EFB 8A241E              <1> 	MOV	AH, [eSI+eBX]		; GET THE WORD
  2386 00004EFE 87D3                <1> 	XCHG	eDX,eBX			; RESTORE BX
  2387 00004F00 5E                  <1> 	POP	eSI
  2388                              <1> 	;POP	DS
  2389 00004F01 C3                  <1> 	RETn
  2390                              <1> 
  2391                              <1> ;-------------------------------------------------------------------------------
  2392                              <1> ; MOTOR_ON
  2393                              <1> ;	TURN MOTOR ON AND WAIT FOR MOTOR START UP TIME. THE @MOTOR_COUNT
  2394                              <1> ;	IS REPLACED WITH A SUFFICIENTLY HIGH NUMBER (0FFH) TO ENSURE
  2395                              <1> ;	THAT THE MOTOR DOES NOT GO OFF DURING THE OPERATION. IF THE
  2396                              <1> ;	MOTOR NEEDED TO BE TURNED ON, THE MULTI-TASKING HOOK FUNCTION
  2397                              <1> ;	(AX=90FDH, INT 15) IS CALLED TELLING THE OPERATING SYSTEM
  2398                              <1> ;	THAT THE BIOS IS ABOUT TO WAIT FOR MOTOR START UP. IF THIS
  2399                              <1> ;	FUNCTION RETURNS WITH CY = 1, IT MEANS THAT THE MINIMUM WAIT
  2400                              <1> ;	HAS BEEN COMPLETED. AT THIS POINT A CHECK IS MADE TO ENSURE
  2401                              <1> ;	THAT THE MOTOR WASN'T TURNED OFF BY THE TIMER. IF THE HOOK DID
  2402                              <1> ;	NOT WAIT, THE WAIT FUNCTION (AH=086H) IS CALLED TO WAIT THE
  2403                              <1> ;	PRESCRIBED AMOUNT OF TIME. IF THE CARRY FLAG IS SET ON RETURN,
  2404                              <1> ;	IT MEANS THAT THE FUNCTION IS IN USE AND DID NOT PERFORM THE
  2405                              <1> ;	WAIT. A TIMER 1 WAIT LOOP WILL THEN DO THE WAIT.
  2406                              <1> ;
  2407                              <1> ; ON ENTRY:	DI = DRIVE #
  2408                              <1> ; ON EXIT:	AX,CX,DX DESTROYED
  2409                              <1> ;-------------------------------------------------------------------------------
  2410                              <1> MOTOR_ON:
  2411 00004F02 53                  <1> 	PUSH	eBX			; SAVE REG.
  2412 00004F03 E82A000000          <1> 	CALL	TURN_ON			; TURN ON MOTOR
  2413 00004F08 7226                <1> 	JC	short MOT_IS_ON		; IF CY=1 NO WAIT
  2414 00004F0A E89BF9FFFF          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  2415 00004F0F E865F9FFFF          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH,
  2416                              <1> 	;CALL	TURN_ON 		; CHECK AGAIN IF MOTOR ON
  2417                              <1> 	;JC	MOT_IS_ON		; IF NO WAIT MEANS IT IS ON
  2418                              <1> M_WAIT:
  2419 00004F14 B20A                <1> 	MOV	DL,10			; GET THE MOTOR WAIT PARAMETER
  2420 00004F16 E8A2FFFFFF          <1> 	CALL	GET_PARM
  2421                              <1> 	;MOV	AL,AH			; AL = MOTOR WAIT PARAMETER
  2422                              <1> 	;XOR	AH,AH			; AX = MOTOR WAIT PARAMETER
  2423                              <1> 	;CMP	AL,8			; SEE IF AT LEAST A SECOND IS SPECIFIED
  2424 00004F1B 80FC08              <1> 	cmp	ah, 8
  2425                              <1> 	;JAE	short GP2		; IF YES, CONTINUE
  2426 00004F1E 7702                <1> 	ja	short J13
  2427                              <1> 	;MOV	AL,8			; ONE SECOND WAIT FOR MOTOR START UP
  2428 00004F20 B408                <1> 	mov	ah, 8
  2429                              <1> 
  2430                              <1> ;-----	AS CONTAINS NUMBER OF 1/8 SECONDS (125000 MICROSECONDS) TO WAIT
  2431                              <1> GP2:	
  2432                              <1> ;----- 	FOLLOWING LOOPS REQUIRED WHEN RTC WAIT FUNCTION IS ALREADY IN USE
  2433                              <1> J13:					; WAIT FOR 1/8 SECOND PER (AL)
  2434 00004F22 B95E200000          <1> 	MOV	eCX,8286		; COUNT FOR 1/8 SECOND AT 15.085737 US
  2435 00004F27 E810D5FFFF          <1> 	CALL	WAITF			; GO TO FIXED WAIT ROUTINE
  2436                              <1> 	;DEC	AL			; DECREMENT TIME VALUE
  2437 00004F2C FECC                <1> 	dec	ah
  2438 00004F2E 75F2                <1> 	JNZ	short J13		; ARE WE DONE YET
  2439                              <1> MOT_IS_ON:
  2440 00004F30 5B                  <1> 	POP	eBX			; RESTORE REG.
  2441 00004F31 C3                  <1> 	RETn
  2442                              <1> 
  2443                              <1> ;-------------------------------------------------------------------------------
  2444                              <1> ; TURN_ON
  2445                              <1> ;	TURN MOTOR ON AND RETURN WAIT STATE.
  2446                              <1> ;
  2447                              <1> ; ON ENTRY:	DI = DRIVE #
  2448                              <1> ;
  2449                              <1> ; ON EXIT:	CY = 0 MEANS WAIT REQUIRED
  2450                              <1> ;		CY = 1 MEANS NO WAIT REQUIRED
  2451                              <1> ;		AX,BX,CX,DX DESTROYED
  2452                              <1> ;-------------------------------------------------------------------------------
  2453                              <1> TURN_ON:
  2454 00004F32 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2455 00004F34 88D9                <1> 	MOV	CL,BL			; CL = DRIVE #
  2456 00004F36 C0C304              <1> 	ROL	BL,4			; BL = DRIVE SELECT
  2457 00004F39 FA                  <1> 	CLI				; NO INTERRUPTS WHILE DETERMINING STATUS
  2458 00004F3A C605[17820100]FF    <1> 	MOV	byte [MOTOR_COUNT],0FFH	; ENSURE MOTOR STAYS ON FOR OPERATION
  2459 00004F41 A0[16820100]        <1> 	MOV	AL, [MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
  2460 00004F46 2430                <1> 	AND	AL,00110000B		; KEEP ONLY DRIVE SELECT BITS
  2461 00004F48 B401                <1> 	MOV	AH,1			; MASK FOR DETERMINING MOTOR BIT
  2462 00004F4A D2E4                <1> 	SHL	AH,CL			; AH = MOTOR ON, A=00000001, B=00000010
  2463                              <1> 
  2464                              <1> ;  AL = DRIVE SELECT FROM @MOTOR_STATUS
  2465                              <1> ;  BL = DRIVE SELECT DESIRED
  2466                              <1> ;  AH = MOTOR ON MASK DESIRED
  2467                              <1> 
  2468 00004F4C 38D8                <1> 	CMP	AL,BL			; REQUESTED DRIVE ALREADY SELECTED ?
  2469 00004F4E 7508                <1> 	JNZ	short TURN_IT_ON	; IF NOT SELECTED JUMP
  2470 00004F50 8425[16820100]      <1> 	TEST	AH, [MOTOR_STATUS]	; TEST MOTOR ON BIT
  2471 00004F56 7535                <1> 	JNZ	short NO_MOT_WAIT	; JUMP IF MOTOR ON AND SELECTED
  2472                              <1> 
  2473                              <1> TURN_IT_ON:
  2474 00004F58 08DC                <1> 	OR	AH,BL			; AH = DRIVE SELECT AND MOTOR ON
  2475 00004F5A 8A3D[16820100]      <1> 	MOV	BH,[MOTOR_STATUS]	; SAVE COPY OF @MOTOR_STATUS BEFORE
  2476 00004F60 80E70F              <1> 	AND	BH,00001111B		; KEEP ONLY MOTOR BITS
  2477 00004F63 8025[16820100]CF    <1> 	AND	byte [MOTOR_STATUS],11001111B ; CLEAR OUT DRIVE SELECT
  2478 00004F6A 0825[16820100]      <1> 	OR	[MOTOR_STATUS],AH	; OR IN DRIVE SELECTED AND MOTOR ON
  2479 00004F70 A0[16820100]        <1> 	MOV	AL,[MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
  2480 00004F75 88C3                <1> 	MOV	BL,AL			; BL=@MOTOR_STATUS AFTER, BH=BEFORE
  2481 00004F77 80E30F              <1> 	AND	BL,00001111B		; KEEP ONLY MOTOR BITS
  2482 00004F7A FB                  <1> 	STI				; ENABLE INTERRUPTS AGAIN
  2483 00004F7B 243F                <1> 	AND	AL,00111111B		; STRIP AWAY UNWANTED BITS
  2484 00004F7D C0C004              <1> 	ROL	AL,4			; PUT BITS IN DESIRED POSITIONS
  2485 00004F80 0C0C                <1> 	OR	AL,00001100B		; NO RESET, ENABLE DMA/INTERRUPT
  2486 00004F82 66BAF203            <1> 	MOV	DX,03F2H		; SELECT DRIVE AND TURN ON MOTOR
  2487 00004F86 EE                  <1> 	OUT	DX,AL
  2488 00004F87 38FB                <1> 	CMP	BL,BH			; NEW MOTOR TURNED ON ?
  2489                              <1> 	;JZ	short NO_MOT_WAIT	; NO WAIT REQUIRED IF JUST SELECT
  2490 00004F89 7403                <1> 	je	short no_mot_w1 ; 27/02/2015 
  2491 00004F8B F8                  <1> 	CLC				; (re)SET CARRY MEANING WAIT
  2492 00004F8C C3                  <1> 	RETn
  2493                              <1> 
  2494                              <1> NO_MOT_WAIT:
  2495 00004F8D FB                  <1> 	sti
  2496                              <1> no_mot_w1: ; 27/02/2015
  2497 00004F8E F9                  <1> 	STC				; SET NO WAIT REQUIRED
  2498                              <1> 	;STI				; INTERRUPTS BACK ON
  2499 00004F8F C3                  <1> 	RETn
  2500                              <1> 
  2501                              <1> ;-------------------------------------------------------------------------------
  2502                              <1> ; HD_WAIT
  2503                              <1> ;	WAIT FOR HEAD SETTLE TIME.
  2504                              <1> ;
  2505                              <1> ; ON ENTRY:	DI = DRIVE #
  2506                              <1> ;
  2507                              <1> ; ON EXIT:	AX,BX,CX,DX DESTROYED
  2508                              <1> ;-------------------------------------------------------------------------------
  2509                              <1> HD_WAIT:
  2510 00004F90 B209                <1> 	MOV	DL,9			; GET HEAD SETTLE PARAMETER
  2511 00004F92 E826FFFFFF          <1> 	CALL	GET_PARM
  2512 00004F97 08E4                <1> 	or	ah, ah	; 17/12/2014
  2513 00004F99 7519                <1> 	jnz	short DO_WAT
  2514 00004F9B F605[16820100]80    <1>         TEST    byte [MOTOR_STATUS],10000000B ; SEE IF A WRITE OPERATION
  2515                              <1> 	;JZ	short ISNT_WRITE	; IF NOT, DO NOT ENFORCE ANY VALUES
  2516                              <1> 	;OR	AH,AH			; CHECK FOR ANY WAIT?
  2517                              <1> 	;JNZ	short DO_WAT		; IF THERE DO NOT ENFORCE
  2518 00004FA2 741E                <1> 	jz	short HW_DONE
  2519 00004FA4 B40F                <1> 	MOV	AH,HD12_SETTLE		; LOAD 1.2M HEAD SETTLE MINIMUM
  2520 00004FA6 8A87[25820100]      <1> 	MOV	AL,[DSK_STATE+eDI]	; LOAD STATE
  2521 00004FAC 24C0                <1> 	AND	AL,RATE_MSK		; KEEP ONLY RATE
  2522 00004FAE 3C80                <1> 	CMP	AL,RATE_250		; 1.2 M DRIVE ?
  2523 00004FB0 7502                <1> 	JNZ	short DO_WAT		; DEFAULT HEAD SETTLE LOADED
  2524                              <1> ;GP3:
  2525 00004FB2 B414                <1> 	MOV	AH,HD320_SETTLE		; USE 320/360 HEAD SETTLE
  2526                              <1> ;	JMP	SHORT DO_WAT
  2527                              <1> 
  2528                              <1> ;ISNT_WRITE:
  2529                              <1> ;	OR	AH,AH			; CHECK FOR NO WAIT
  2530                              <1> ;	JZ	short HW_DONE		; IF NOT WRITE AND 0 ITS OK
  2531                              <1> 
  2532                              <1> ;-----	AH CONTAINS NUMBER OF MILLISECONDS TO WAIT
  2533                              <1> DO_WAT:
  2534                              <1> ;	MOV	AL,AH			; AL = # MILLISECONDS
  2535                              <1> ;	;XOR	AH,AH			; AX = # MILLISECONDS
  2536                              <1> J29:					; 	1 MILLISECOND LOOP
  2537                              <1> 	;mov	cx, WAIT_FDU_HEAD_SETTLE ; 33 ; 1 ms in 30 micro units.
  2538 00004FB4 B942000000          <1> 	MOV	eCX,66			; COUNT AT 15.085737 US PER COUNT
  2539 00004FB9 E87ED4FFFF          <1> 	CALL	WAITF			; DELAY FOR 1 MILLISECOND
  2540                              <1> 	;DEC	AL			; DECREMENT THE COUNT
  2541 00004FBE FECC                <1> 	dec	ah
  2542 00004FC0 75F2                <1> 	JNZ	short J29		; DO AL MILLISECOND # OF TIMES
  2543                              <1> HW_DONE:
  2544 00004FC2 C3                  <1> 	RETn
  2545                              <1> 
  2546                              <1> ;-------------------------------------------------------------------------------
  2547                              <1> ; NEC_OUTPUT
  2548                              <1> ;	THIS ROUTINE SENDS A BYTE TO THE NEC CONTROLLER AFTER TESTING
  2549                              <1> ;	FOR CORRECT DIRECTION AND CONTROLLER READY THIS ROUTINE WILL
  2550                              <1> ;	TIME OUT IF THE BYTE IS NOT ACCEPTED WITHIN A REASONABLE AMOUNT
  2551                              <1> ;	OF TIME, SETTING THE DISKETTE STATUS ON COMPLETION.
  2552                              <1> ; 
  2553                              <1> ; ON ENTRY: 	AH = BYTE TO BE OUTPUT
  2554                              <1> ;
  2555                              <1> ; ON EXIT:	CY = 0  SUCCESS
  2556                              <1> ;		CY = 1  FAILURE -- DISKETTE STATUS UPDATED
  2557                              <1> ;		        IF A FAILURE HAS OCCURRED, THE RETURN IS MADE ONE LEVEL
  2558                              <1> ;		        HIGHER THAN THE CALLER OF NEC OUTPUT. THIS REMOVES THE
  2559                              <1> ;		        REQUIREMENT OF TESTING AFTER EVERY CALL OF NEC_OUTPUT.
  2560                              <1> ;		AX,CX,DX DESTROYED
  2561                              <1> ;-------------------------------------------------------------------------------
  2562                              <1> 
  2563                              <1> ; 09/12/2014 [Erdogan Tan] 
  2564                              <1> ;	(from 'PS2 Hardware Interface Tech. Ref. May 88', Page 09-05.)
  2565                              <1> ; Diskette Drive Controller Status Register (3F4h)
  2566                              <1> ;	This read only register facilitates the transfer of data between
  2567                              <1> ;	the system microprocessor and the controller.
  2568                              <1> ; Bit 7 - When set to 1, the Data register is ready to transfer data 
  2569                              <1> ;	  with the system micrprocessor.
  2570                              <1> ; Bit 6 - The direction of data transfer. If this bit is set to 0,
  2571                              <1> ;	  the transfer is to the controller.
  2572                              <1> ; Bit 5 - When this bit is set to 1, the controller is in the non-DMA mode.
  2573                              <1> ; Bit 4 - When this bit is set to 1, a Read or Write command is being executed.
  2574                              <1> ; Bit 3 - Reserved.
  2575                              <1> ; Bit 2 - Reserved.
  2576                              <1> ; Bit 1 - When this bit is set to 1, dskette drive 1 is in the seek mode.
  2577                              <1> ; Bit 0 - When this bit is set to 1, dskette drive 1 is in the seek mode.
  2578                              <1> 
  2579                              <1> ; Data Register (3F5h)
  2580                              <1> ; This read/write register passes data, commands and parameters, and provides
  2581                              <1> ; diskette status information.
  2582                              <1>   		
  2583                              <1> NEC_OUTPUT:
  2584                              <1> 	;PUSH	BX			; SAVE REG.
  2585 00004FC3 66BAF403            <1> 	MOV	DX,03F4H		; STATUS PORT
  2586                              <1> 	;MOV	BL,2			; HIGH ORDER COUNTER
  2587                              <1> 	;XOR	CX,CX			; COUNT FOR TIME OUT
  2588                              <1> 	; 16/12/2014
  2589                              <1> 	; waiting for (max.) 0.5 seconds
  2590                              <1>         ;;mov     byte [wait_count], 0 ;; 27/02/2015
  2591                              <1> 	;
  2592                              <1> 	; 17/12/2014
  2593                              <1> 	; Modified from AWARD BIOS 1999 - ADISK.ASM - SEND_COMMAND
  2594                              <1> 	;
  2595                              <1> 	;WAIT_FOR_PORT:	Waits for a bit at a port pointed to by DX to
  2596                              <1> 	;		go on.
  2597                              <1> 	;INPUT:
  2598                              <1> 	;	AH=Mask for isolation bits.
  2599                              <1> 	;	AL=pattern to look for.
  2600                              <1> 	;	DX=Port to test for
  2601                              <1> 	;	BH:CX=Number of memory refresh periods to delay.
  2602                              <1> 	;	     (normally 30 microseconds per period.)
  2603                              <1> 	;
  2604                              <1> 	;WFP_SHORT:  
  2605                              <1> 	;	Wait for port if refresh cycle is short (15-80 Us range).
  2606                              <1> 	;
  2607                              <1> 
  2608                              <1> ;	mov	bl, WAIT_FDU_SEND_HI+1	; 0+1
  2609                              <1> ;	mov	cx, WAIT_FDU_SEND_LO	; 16667
  2610 00004FC7 B91B410000          <1> 	mov	ecx, WAIT_FDU_SEND_LH   ; 16667 (27/02/2015)
  2611                              <1> ;
  2612                              <1> ;WFPS_OUTER_LP:
  2613                              <1> ;	;
  2614                              <1> ;WFPS_CHECK_PORT:
  2615                              <1> J23:
  2616 00004FCC EC                  <1> 	IN	AL,DX			; GET STATUS
  2617 00004FCD 24C0                <1> 	AND	AL,11000000B		; KEEP STATUS AND DIRECTION
  2618 00004FCF 3C80                <1> 	CMP	AL,10000000B		; STATUS 1 AND DIRECTION 0 ?
  2619 00004FD1 7418                <1> 	JZ	short J27		; STATUS AND DIRECTION OK
  2620                              <1> WFPS_HI:
  2621 00004FD3 E461                <1> 	IN	AL, PORT_B	;061h	; SYS1	; wait for hi to lo
  2622 00004FD5 A810                <1> 	TEST	AL,010H			; transition on memory
  2623 00004FD7 75FA                <1> 	JNZ	SHORT WFPS_HI		; refresh.
  2624                              <1> WFPS_LO:
  2625 00004FD9 E461                <1> 	IN	AL, PORT_B		; SYS1
  2626 00004FDB A810                <1> 	TEST	AL,010H
  2627 00004FDD 74FA                <1> 	JZ	SHORT WFPS_LO
  2628                              <1> 	;LOOP	SHORT WFPS_CHECK_PORT
  2629 00004FDF E2EB                <1> 	loop	J23	; 27/02/2015
  2630                              <1> ;	;
  2631                              <1> ;	dec	bl
  2632                              <1> ;	jnz	short WFPS_OUTER_LP
  2633                              <1> ;	jmp	short WFPS_TIMEOUT	; fail
  2634                              <1> ;J23:
  2635                              <1> ;	IN	AL,DX			; GET STATUS
  2636                              <1> ;	AND	AL,11000000B		; KEEP STATUS AND DIRECTION
  2637                              <1> ;	CMP	AL,10000000B		; STATUS 1 AND DIRECTION 0 ?
  2638                              <1> ;	JZ	short J27		; STATUS AND DIRECTION OK
  2639                              <1> 	;LOOP	J23			; CONTINUE TILL CX EXHAUSTED
  2640                              <1> 	;DEC	BL			; DECREMENT COUNTER
  2641                              <1> 	;JNZ	short J23		; REPEAT TILL DELAY FINISHED, CX = 0
  2642                              <1>    
  2643                              <1> 	;;27/02/2015
  2644                              <1> 	;16/12/2014
  2645                              <1>         ;;cmp     byte [wait_count], 10   ; (10/18.2 seconds)
  2646                              <1> 	;;jb	short J23
  2647                              <1> 
  2648                              <1> ;WFPS_TIMEOUT:
  2649                              <1> 
  2650                              <1> ;-----	FALL THRU TO ERROR RETURN
  2651                              <1> 
  2652 00004FE1 800D[18820100]80    <1> 	OR	byte [DSKETTE_STATUS],TIME_OUT
  2653                              <1> 	;POP	BX			; RESTORE REG.
  2654 00004FE8 58                  <1> 	POP	eAX ; 08/02/2015	; DISCARD THE RETURN ADDRESS
  2655 00004FE9 F9                  <1> 	STC				; INDICATE ERROR TO CALLER
  2656 00004FEA C3                  <1> 	RETn
  2657                              <1> 
  2658                              <1> ;-----	DIRECTION AND STATUS OK; OUTPUT BYTE
  2659                              <1> 
  2660                              <1> J27:	
  2661 00004FEB 88E0                <1> 	MOV	AL,AH			; GET BYTE TO OUTPUT
  2662 00004FED 6642                <1> 	INC	DX			; DATA PORT = STATUS PORT + 1
  2663 00004FEF EE                  <1> 	OUT	DX,AL			; OUTPUT THE BYTE
  2664                              <1> 	;;NEWIODELAY  ;; 27/02/2015
  2665                              <1> 	; 27/02/2015
  2666 00004FF0 9C                  <1> 	PUSHF				; SAVE FLAGS
  2667 00004FF1 B903000000          <1> 	MOV	eCX, 3			; 30 TO 45 MICROSECONDS WAIT FOR
  2668 00004FF6 E841D4FFFF          <1> 	CALL 	WAITF			; NEC FLAGS UPDATE CYCLE
  2669 00004FFB 9D                  <1> 	POPF				; RESTORE FLAGS FOR EXIT
  2670                              <1> 	;POP	BX			; RESTORE REG
  2671 00004FFC C3                  <1> 	RETn				; CY = 0 FROM TEST INSTRUCTION
  2672                              <1> 
  2673                              <1> ;-------------------------------------------------------------------------------
  2674                              <1> ; SEEK
  2675                              <1> ;	THIS ROUTINE WILL MOVE THE HEAD ON THE NAMED DRIVE TO THE NAMED
  2676                              <1> ;	TRACK. IF THE DRIVE HAS NOT BEEN ACCESSED SINCE THE DRIVE
  2677                              <1> ;	RESET COMMAND WAS ISSUED, THE DRIVE WILL BE RECALIBRATED.
  2678                              <1> ;
  2679                              <1> ; ON ENTRY:	DI = DRIVE #
  2680                              <1> ;		CH = TRACK #
  2681                              <1> ;
  2682                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2683                              <1> ;		AX,BX,CX DX DESTROYED
  2684                              <1> ;-------------------------------------------------------------------------------
  2685                              <1> SEEK:
  2686 00004FFD 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2687 00004FFF B001                <1> 	MOV	AL,1			; ESTABLISH MASK FOR RECALIBRATE TEST
  2688 00005001 86CB                <1> 	XCHG	CL,BL			; SET DRIVE VALULE INTO CL
  2689 00005003 D2C0                <1> 	ROL	AL,CL			; SHIFT MASK BY THE DRIVE VALUE
  2690 00005005 86CB                <1> 	XCHG	CL,BL			; RECOVER TRACK VALUE
  2691 00005007 8405[15820100]      <1> 	TEST	AL,[SEEK_STATUS]	; TEST FOR RECALIBRATE REQUIRED
  2692 0000500D 7526                <1> 	JNZ	short J28A		; JUMP IF RECALIBRATE NOT REQUIRED
  2693                              <1> 
  2694 0000500F 0805[15820100]      <1> 	OR	[SEEK_STATUS],AL	; TURN ON THE NO RECALIBRATE BIT IN FLAG
  2695 00005015 E862000000          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  2696 0000501A 730E                <1> 	JNC	short AFT_RECAL		; RECALIBRATE DONE
  2697                              <1> 
  2698                              <1> ;-----	ISSUE RECALIBRATE FOR 80 TRACK DISKETTES
  2699                              <1> 
  2700 0000501C C605[18820100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; CLEAR OUT INVALID STATUS
  2701 00005023 E854000000          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  2702 00005028 7251                <1> 	JC	short RB		; IF RECALIBRATE FAILS TWICE THEN ERROR
  2703                              <1> 
  2704                              <1> AFT_RECAL:
  2705 0000502A C687[29820100]00    <1>         MOV     byte [DSK_TRK+eDI],0    ; SAVE NEW CYLINDER AS PRESENT POSITION
  2706 00005031 08ED                <1> 	OR	CH,CH			; CHECK FOR SEEK TO TRACK 0
  2707 00005033 743F                <1> 	JZ	short DO_WAIT		; HEAD SETTLE, CY = 0 IF JUMP
  2708                              <1> 
  2709                              <1> ;-----	DRIVE IS IN SYNCHRONIZATION WITH CONTROLLER, SEEK TO TRACK
  2710                              <1> 
  2711 00005035 F687[25820100]20    <1> J28A:	TEST	byte [DSK_STATE+eDI],DBL_STEP ; CHECK FOR DOUBLE STEP REQUIRED
  2712 0000503C 7402                <1> 	JZ	short _R7		; SINGLE STEP REQUIRED BYPASS DOUBLE
  2713 0000503E D0E5                <1> 	SHL	CH,1			; DOUBLE NUMBER OF STEP TO TAKE
  2714                              <1> 
  2715 00005040 3AAF[29820100]      <1> _R7:	CMP	CH, [DSK_TRK+eDI]	; SEE IF ALREADY AT THE DESIRED TRACK
  2716 00005046 7433                <1> 	JE	short RB		; IF YES, DO NOT NEED TO SEEK
  2717                              <1> 
  2718 00005048 BA[7B500000]        <1> 	MOV	eDX, NEC_ERR		; LOAD RETURN ADDRESS
  2719 0000504D 52                  <1> 	PUSH	eDX ; (*)		; ON STACK FOR NEC OUTPUT ERROR
  2720 0000504E 88AF[29820100]      <1> 	MOV	[DSK_TRK+eDI],CH	; SAVE NEW CYLINDER AS PRESENT POSITION
  2721 00005054 B40F                <1> 	MOV	AH,0FH			; SEEK COMMAND TO NEC
  2722 00005056 E868FFFFFF          <1> 	CALL	NEC_OUTPUT
  2723 0000505B 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2724 0000505D 88DC                <1> 	MOV	AH,BL			; OUTPUT DRIVE NUMBER
  2725 0000505F E85FFFFFFF          <1> 	CALL	NEC_OUTPUT
  2726 00005064 8AA7[29820100]      <1> 	MOV	AH, [DSK_TRK+eDI]	; GET CYLINDER NUMBER
  2727 0000506A E854FFFFFF          <1> 	CALL	NEC_OUTPUT
  2728 0000506F E829000000          <1> 	CALL	CHK_STAT_2		; ENDING INTERRUPT AND SENSE STATUS
  2729                              <1> 
  2730                              <1> ;-----	WAIT FOR HEAD SETTLE
  2731                              <1> 
  2732                              <1> DO_WAIT:
  2733 00005074 9C                  <1> 	PUSHF				; SAVE STATUS
  2734 00005075 E816FFFFFF          <1> 	CALL	HD_WAIT			; WAIT FOR HEAD SETTLE TIME
  2735 0000507A 9D                  <1> 	POPF				; RESTORE STATUS
  2736                              <1> RB:
  2737                              <1> NEC_ERR:
  2738                              <1> 	; 08/02/2015 (code trick here from original IBM PC/AT DISKETTE.ASM)
  2739                              <1> 	; (*) nec_err -> retn (push edx -> pop edx) -> nec_err -> retn
  2740 0000507B C3                  <1> 	RETn				; RETURN TO CALLER
  2741                              <1> 
  2742                              <1> ;-------------------------------------------------------------------------------
  2743                              <1> ; RECAL
  2744                              <1> ;	RECALIBRATE DRIVE
  2745                              <1> ;
  2746                              <1> ; ON ENTRY:	DI = DRIVE #
  2747                              <1> ;
  2748                              <1> ; ON EXIT:	CY REFLECTS STATUS OF OPERATION.
  2749                              <1> ;-------------------------------------------------------------------------------
  2750                              <1> RECAL:
  2751 0000507C 6651                <1> 	PUSH	CX
  2752 0000507E B8[9A500000]        <1> 	MOV	eAX, RC_BACK		; LOAD NEC_OUTPUT ERROR
  2753 00005083 50                  <1> 	PUSH	eAX
  2754 00005084 B407                <1> 	MOV	AH,07H			; RECALIBRATE COMMAND
  2755 00005086 E838FFFFFF          <1> 	CALL	NEC_OUTPUT
  2756 0000508B 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2757 0000508D 88DC                <1> 	MOV	AH,BL
  2758 0000508F E82FFFFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE DRIVE NUMBER
  2759 00005094 E804000000          <1> 	CALL	CHK_STAT_2		; GET THE INTERRUPT AND SENSE INT STATUS
  2760 00005099 58                  <1> 	POP	eAX			; THROW AWAY ERROR
  2761                              <1> RC_BACK:
  2762 0000509A 6659                <1> 	POP	CX
  2763 0000509C C3                  <1> 	RETn
  2764                              <1> 
  2765                              <1> ;-------------------------------------------------------------------------------
  2766                              <1> ; CHK_STAT_2
  2767                              <1> ;	THIS ROUTINE HANDLES THE INTERRUPT RECEIVED AFTER RECALIBRATE,
  2768                              <1> ;	OR SEEK TO THE ADAPTER. THE INTERRUPT IS WAITED FOR, THE
  2769                              <1> ;	INTERRUPT STATUS SENSED, AND THE RESULT RETURNED TO THE CALLER.
  2770                              <1> ;
  2771                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2772                              <1> ;-------------------------------------------------------------------------------
  2773                              <1> CHK_STAT_2:
  2774 0000509D B8[C5500000]        <1>         MOV     eAX, CS_BACK            ; LOAD NEC_OUTPUT ERROR ADDRESS
  2775 000050A2 50                  <1> 	PUSH	eAX
  2776 000050A3 E828000000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
  2777 000050A8 721A                <1> 	JC	short J34		; IF ERROR, RETURN IT
  2778 000050AA B408                <1> 	MOV	AH,08H			; SENSE INTERRUPT STATUS COMMAND
  2779 000050AC E812FFFFFF          <1> 	CALL	NEC_OUTPUT
  2780 000050B1 E84A000000          <1> 	CALL	RESULTS			; READ IN THE RESULTS
  2781 000050B6 720C                <1> 	JC	short J34
  2782 000050B8 A0[19820100]        <1> 	MOV	AL,[NEC_STATUS]		; GET THE FIRST STATUS BYTE
  2783 000050BD 2460                <1> 	AND	AL,01100000B		; ISOLATE THE BITS
  2784 000050BF 3C60                <1> 	CMP	AL,01100000B		; TEST FOR CORRECT VALUE
  2785 000050C1 7403                <1> 	JZ	short J35		; IF ERROR, GO MARK IT
  2786 000050C3 F8                  <1> 	CLC				; GOOD RETURN
  2787                              <1> J34:
  2788 000050C4 58                  <1> 	POP	eAX			; THROW AWAY ERROR RETURN
  2789                              <1> CS_BACK:
  2790 000050C5 C3                  <1> 	RETn
  2791                              <1> J35:
  2792 000050C6 800D[18820100]40    <1> 	OR	byte [DSKETTE_STATUS], BAD_SEEK
  2793 000050CD F9                  <1> 	STC				; ERROR RETURN CODE
  2794 000050CE EBF4                <1> 	JMP	SHORT J34
  2795                              <1> 
  2796                              <1> ;-------------------------------------------------------------------------------
  2797                              <1> ; WAIT_INT
  2798                              <1> ;	THIS ROUTINE WAITS FOR AN INTERRUPT TO OCCUR A TIME OUT ROUTINE
  2799                              <1> ;	TAKES PLACE DURING THE WAIT, SO THAT AN ERROR MAY BE RETURNED
  2800                              <1> ;	IF THE DRIVE IS NOT READY.
  2801                              <1> ;
  2802                              <1> ; ON EXIT: 	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2803                              <1> ;-------------------------------------------------------------------------------
  2804                              <1> 
  2805                              <1> ; 17/12/2014
  2806                              <1> ; 2.5 seconds waiting !
  2807                              <1> ;(AWARD BIOS - 1999, WAIT_FDU_INT_LOW, WAIT_FDU_INT_HI)
  2808                              <1> ; amount of time to wait for completion interrupt from NEC.
  2809                              <1> 
  2810                              <1> 
  2811                              <1> WAIT_INT:
  2812 000050D0 FB                  <1> 	STI				; TURN ON INTERRUPTS, JUST IN CASE
  2813 000050D1 F8                  <1> 	CLC				; CLEAR TIMEOUT INDICATOR
  2814                              <1>        ;MOV	BL,10			; CLEAR THE COUNTERS
  2815                              <1>        ;XOR	CX,CX			; FOR 2 SECOND WAIT
  2816                              <1> 
  2817                              <1> 	; Modification from AWARD BIOS - 1999 (ATORGS.ASM, WAIT
  2818                              <1> 	;
  2819                              <1> 	;WAIT_FOR_MEM:	
  2820                              <1> 	;	Waits for a bit at a specified memory location pointed
  2821                              <1> 	;	to by ES:[DI] to become set.
  2822                              <1> 	;INPUT:
  2823                              <1> 	;	AH=Mask to test with.
  2824                              <1> 	;	ES:[DI] = memory location to watch.
  2825                              <1> 	;	BH:CX=Number of memory refresh periods to delay.
  2826                              <1> 	;	     (normally 30 microseconds per period.)
  2827                              <1> 
  2828                              <1> 	; waiting for (max.) 2.5 secs in 30 micro units.
  2829                              <1> ;	mov 	cx, WAIT_FDU_INT_LO		; 017798
  2830                              <1> ;;	mov 	bl, WAIT_FDU_INT_HI
  2831                              <1> ;	mov 	bl, WAIT_FDU_INT_HI + 1
  2832                              <1> 	; 27/02/2015
  2833 000050D2 B986450100          <1> 	mov 	ecx, WAIT_FDU_INT_LH	; 83334 (2.5 seconds)		
  2834                              <1> WFMS_CHECK_MEM:
  2835 000050D7 F605[15820100]80    <1> 	test	byte [SEEK_STATUS],INT_FLAG ; TEST FOR INTERRUPT OCCURRING
  2836 000050DE 7516                <1>         jnz     short J37
  2837                              <1> WFMS_HI:
  2838 000050E0 E461                <1> 	IN	AL,PORT_B  ; 061h	; SYS1, wait for lo to hi
  2839 000050E2 A810                <1> 	TEST	AL,010H			; transition on memory
  2840 000050E4 75FA                <1> 	JNZ	SHORT WFMS_HI		; refresh.
  2841                              <1> WFMS_LO:
  2842 000050E6 E461                <1> 	IN	AL,PORT_B		;SYS1
  2843 000050E8 A810                <1> 	TEST	AL,010H
  2844 000050EA 74FA                <1> 	JZ	SHORT WFMS_LO
  2845 000050EC E2E9                <1>         LOOP    WFMS_CHECK_MEM
  2846                              <1> ;WFMS_OUTER_LP:
  2847                              <1> ;;	or	bl, bl			; check outer counter
  2848                              <1> ;;	jz	short J36A		; WFMS_TIMEOUT
  2849                              <1> ;	dec	bl
  2850                              <1> ;	jz	short J36A	
  2851                              <1> ;	jmp	short WFMS_CHECK_MEM
  2852                              <1> 
  2853                              <1> 	;17/12/2014
  2854                              <1> 	;16/12/2014
  2855                              <1> ;        mov     byte [wait_count], 0    ; Reset (INT 08H) counter
  2856                              <1> ;J36:
  2857                              <1> ;	TEST	byte [SEEK_STATUS],INT_FLAG ; TEST FOR INTERRUPT OCCURRING
  2858                              <1> ;	JNZ	short J37
  2859                              <1> 	;16/12/2014
  2860                              <1> 	;LOOP	J36			; COUNT DOWN WHILE WAITING
  2861                              <1> 	;DEC	BL			; SECOND LEVEL COUNTER
  2862                              <1> 	;JNZ	short J36
  2863                              <1> ;       cmp     byte [wait_count], 46   ; (46/18.2 seconds)
  2864                              <1> ;	jb	short J36
  2865                              <1> 
  2866                              <1> ;WFMS_TIMEOUT:
  2867                              <1> ;J36A:
  2868 000050EE 800D[18820100]80    <1> 	OR	byte [DSKETTE_STATUS], TIME_OUT ; NOTHING HAPPENED
  2869 000050F5 F9                  <1> 	STC				; ERROR RETURN
  2870                              <1> J37:
  2871 000050F6 9C                  <1> 	PUSHF				; SAVE CURRENT CARRY
  2872 000050F7 8025[15820100]7F    <1> 	AND	byte [SEEK_STATUS], ~INT_FLAG ; TURN OFF INTERRUPT FLAG
  2873 000050FE 9D                  <1> 	POPF				; RECOVER CARRY
  2874 000050FF C3                  <1> 	RETn				; GOOD RETURN CODE
  2875                              <1> 
  2876                              <1> ;-------------------------------------------------------------------------------
  2877                              <1> ; RESULTS
  2878                              <1> ;	THIS ROUTINE WILL READ ANYTHING THAT THE NEC CONTROLLER RETURNS 
  2879                              <1> ;	FOLLOWING AN INTERRUPT.
  2880                              <1> ;
  2881                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2882                              <1> ;		AX,BX,CX,DX DESTROYED
  2883                              <1> ;-------------------------------------------------------------------------------
  2884                              <1> RESULTS:
  2885 00005100 57                  <1> 	PUSH	eDI
  2886 00005101 BF[19820100]        <1> 	MOV	eDI, NEC_STATUS		; POINTER TO DATA AREA
  2887 00005106 B307                <1> 	MOV	BL,7			; MAX STATUS BYTES
  2888 00005108 66BAF403            <1> 	MOV	DX,03F4H		; STATUS PORT
  2889                              <1> 
  2890                              <1> ;-----	WAIT FOR REQUEST FOR MASTER
  2891                              <1> 
  2892                              <1> _R10: 
  2893                              <1> 	; 16/12/2014
  2894                              <1> 	; wait for (max) 0.5 seconds
  2895                              <1> 	;MOV	BH,2			; HIGH ORDER COUNTER
  2896                              <1> 	;XOR	CX,CX			; COUNTER
  2897                              <1> 
  2898                              <1> 	;Time to wait while waiting for each byte of NEC results = .5
  2899                              <1> 	;seconds.  .5 seconds = 500,000 micros.  500,000/30 = 16,667.
  2900                              <1> 	; 27/02/2015
  2901 0000510C B91B410000          <1> 	mov 	ecx, WAIT_FDU_RESULTS_LH ; 16667  
  2902                              <1> 	;mov	cx, WAIT_FDU_RESULTS_LO  ; 16667
  2903                              <1> 	;mov	bh, WAIT_FDU_RESULTS_HI+1 ; 0+1
  2904                              <1> 
  2905                              <1> WFPSR_OUTER_LP:
  2906                              <1> 	;
  2907                              <1> WFPSR_CHECK_PORT:
  2908                              <1> J39:					; WAIT FOR MASTER
  2909 00005111 EC                  <1> 	IN	AL,DX			; GET STATUS
  2910 00005112 24C0                <1> 	AND	AL,11000000B		; KEEP ONLY STATUS AND DIRECTION
  2911 00005114 3CC0                <1> 	CMP	AL,11000000B		; STATUS 1 AND DIRECTION 1 ?
  2912 00005116 7418                <1> 	JZ	short J42		; STATUS AND DIRECTION OK
  2913                              <1> WFPSR_HI:
  2914 00005118 E461                <1> 	IN	AL, PORT_B	;061h	; SYS1	; wait for hi to lo
  2915 0000511A A810                <1> 	TEST	AL,010H			; transition on memory
  2916 0000511C 75FA                <1> 	JNZ	SHORT WFPSR_HI		; refresh.
  2917                              <1> WFPSR_LO:
  2918 0000511E E461                <1> 	IN	AL, PORT_B		; SYS1
  2919 00005120 A810                <1> 	TEST	AL,010H
  2920 00005122 74FA                <1> 	JZ	SHORT WFPSR_LO
  2921 00005124 E2EB                <1>         LOOP    WFPSR_CHECK_PORT
  2922                              <1> 	;; 27/02/2015
  2923                              <1> 	;;dec	bh
  2924                              <1> 	;;jnz	short WFPSR_OUTER_LP
  2925                              <1> 	;jmp	short WFPSR_TIMEOUT	; fail
  2926                              <1> 
  2927                              <1> 	;;mov	byte [wait_count], 0
  2928                              <1> ;J39:					; WAIT FOR MASTER
  2929                              <1> ;	IN	AL,DX			; GET STATUS
  2930                              <1> ;	AND	AL,11000000B		; KEEP ONLY STATUS AND DIRECTION
  2931                              <1> ;	CMP	AL,11000000B		; STATUS 1 AND DIRECTION 1 ?
  2932                              <1> ;	JZ	short J42		; STATUS AND DIRECTION OK
  2933                              <1> 	;LOOP	J39			; LOOP TILL TIMEOUT
  2934                              <1> 	;DEC	BH			; DECREMENT HIGH ORDER COUNTER
  2935                              <1> 	;JNZ	short J39		; REPEAT TILL DELAY DONE
  2936                              <1> 	;
  2937                              <1> 	;;cmp	byte [wait_count], 10  ; (10/18.2 seconds)
  2938                              <1> 	;;jb	short J39	
  2939                              <1> 
  2940                              <1> ;WFPSR_TIMEOUT:
  2941 00005126 800D[18820100]80    <1> 	OR	byte [DSKETTE_STATUS],TIME_OUT
  2942 0000512D F9                  <1> 	STC				; SET ERROR RETURN
  2943 0000512E EB29                <1> 	JMP	SHORT POPRES		; POP REGISTERS AND RETURN
  2944                              <1> 
  2945                              <1> ;-----	READ IN THE STATUS
  2946                              <1> 
  2947                              <1> J42:
  2948 00005130 EB00                <1> 	JMP	$+2			; I/O DELAY
  2949 00005132 6642                <1> 	INC	DX			; POINT AT DATA PORT
  2950 00005134 EC                  <1> 	IN	AL,DX			; GET THE DATA
  2951                              <1> 	; 16/12/2014
  2952                              <1> 	NEWIODELAY
  2952 00005135 E6EB                <2>  out 0ebh,al
  2953 00005137 8807                <1>         MOV     [eDI],AL                ; STORE THE BYTE
  2954 00005139 47                  <1> 	INC	eDI			; INCREMENT THE POINTER
  2955                              <1> 	; 16/12/2014
  2956                              <1> ;	push	cx
  2957                              <1> ;	mov	cx, 30
  2958                              <1> ;wdw2:
  2959                              <1> ;	NEWIODELAY
  2960                              <1> ;	loop	wdw2
  2961                              <1> ;	pop	cx
  2962                              <1> 
  2963 0000513A B903000000          <1> 	MOV	eCX,3			; MINIMUM 24 MICROSECONDS FOR NEC
  2964 0000513F E8F8D2FFFF          <1> 	CALL	WAITF			; WAIT 30 TO 45 MICROSECONDS
  2965 00005144 664A                <1> 	DEC	DX			; POINT AT STATUS PORT
  2966 00005146 EC                  <1> 	IN	AL,DX			; GET STATUS
  2967                              <1> 	; 16/12/2014
  2968                              <1> 	NEWIODELAY
  2968 00005147 E6EB                <2>  out 0ebh,al
  2969                              <1> 	;
  2970 00005149 A810                <1> 	TEST	AL,00010000B		; TEST FOR NEC STILL BUSY
  2971 0000514B 740C                <1> 	JZ	short POPRES		; RESULTS DONE ?
  2972                              <1> 
  2973 0000514D FECB                <1> 	DEC	BL			; DECREMENT THE STATUS COUNTER
  2974 0000514F 75BB                <1>         JNZ     short _R10              ; GO BACK FOR MORE
  2975 00005151 800D[18820100]20    <1> 	OR	byte [DSKETTE_STATUS],BAD_NEC ; TOO MANY STATUS BYTES
  2976 00005158 F9                  <1> 	STC				; SET ERROR FLAG
  2977                              <1> 
  2978                              <1> ;-----	RESULT OPERATION IS DONE
  2979                              <1> POPRES:
  2980 00005159 5F                  <1> 	POP	eDI
  2981 0000515A C3                  <1> 	RETn				; RETURN WITH CARRY SET
  2982                              <1> 
  2983                              <1> ;-------------------------------------------------------------------------------
  2984                              <1> ; READ_DSKCHNG
  2985                              <1> ;	READS THE STATE OF THE DISK CHANGE LINE.
  2986                              <1> ;
  2987                              <1> ; ON ENTRY:	DI = DRIVE #
  2988                              <1> ;
  2989                              <1> ; ON EXIT:	DI = DRIVE #
  2990                              <1> ;		ZF = 0 : DISK CHANGE LINE INACTIVE
  2991                              <1> ;		ZF = 1 : DISK CHANGE LINE ACTIVE
  2992                              <1> ;		AX,CX,DX DESTROYED
  2993                              <1> ;-------------------------------------------------------------------------------
  2994                              <1> READ_DSKCHNG:
  2995 0000515B E8A2FDFFFF          <1> 	CALL	MOTOR_ON		; TURN ON THE MOTOR IF OFF
  2996 00005160 66BAF703            <1> 	MOV	DX,03F7H		; ADDRESS DIGITAL INPUT REGISTER
  2997 00005164 EC                  <1> 	IN	AL,DX			; INPUT DIGITAL INPUT REGISTER
  2998 00005165 A880                <1> 	TEST	AL,DSK_CHG		; CHECK FOR DISK CHANGE LINE ACTIVE
  2999 00005167 C3                  <1> 	RETn				; RETURN TO CALLER WITH ZERO FLAG SET
  3000                              <1> 
  3001                              <1> ;-------------------------------------------------------------------------------
  3002                              <1> ; DRIVE_DET
  3003                              <1> ;	DETERMINES WHETHER DRIVE IS 80 OR 40 TRACKS AND
  3004                              <1> ;	UPDATES STATE INFORMATION ACCORDINGLY.
  3005                              <1> ; ON ENTRY:	DI = DRIVE #
  3006                              <1> ;-------------------------------------------------------------------------------
  3007                              <1> DRIVE_DET:
  3008 00005168 E895FDFFFF          <1> 	CALL	MOTOR_ON		; TURN ON MOTOR IF NOT ALREADY ON
  3009 0000516D E80AFFFFFF          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  3010 00005172 7251                <1> 	JC	short DD_BAC		; ASSUME NO DRIVE PRESENT
  3011 00005174 B530                <1> 	MOV	CH,TRK_SLAP		; SEEK TO TRACK 48
  3012 00005176 E882FEFFFF          <1> 	CALL	SEEK
  3013 0000517B 7248                <1> 	JC	short DD_BAC		; ERROR NO DRIVE
  3014 0000517D B50B                <1> 	MOV	CH,QUIET_SEEK+1		; SEEK TO TRACK 10
  3015                              <1> SK_GIN:
  3016 0000517F FECD                <1> 	DEC	CH			; DECREMENT TO NEXT TRACK
  3017 00005181 6651                <1> 	PUSH	CX			; SAVE TRACK
  3018 00005183 E875FEFFFF          <1> 	CALL	SEEK
  3019 00005188 723C                <1> 	JC	short POP_BAC		; POP AND RETURN
  3020 0000518A B8[C6510000]        <1> 	MOV	eAX, POP_BAC		; LOAD NEC OUTPUT ERROR ADDRESS
  3021 0000518F 50                  <1> 	PUSH	eAX
  3022 00005190 B404                <1> 	MOV	AH,SENSE_DRV_ST		; SENSE DRIVE STATUS COMMAND BYTE
  3023 00005192 E82CFEFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO NEC
  3024 00005197 6689F8              <1> 	MOV	AX,DI			; AL = DRIVE
  3025 0000519A 88C4                <1> 	MOV	AH,AL			; AH = DRIVE
  3026 0000519C E822FEFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO NEC
  3027 000051A1 E85AFFFFFF          <1> 	CALL	RESULTS			; GO GET STATUS
  3028 000051A6 58                  <1> 	POP	eAX			; THROW AWAY ERROR ADDRESS
  3029 000051A7 6659                <1> 	POP	CX			; RESTORE TRACK
  3030 000051A9 F605[19820100]10    <1> 	TEST	byte [NEC_STATUS], HOME	; TRACK 0 ?
  3031 000051B0 74CD                <1> 	JZ	short SK_GIN		; GO TILL TRACK 0
  3032 000051B2 08ED                <1> 	OR	CH,CH			; IS HOME AT TRACK 0
  3033 000051B4 7408                <1> 	JZ	short IS_80		; MUST BE 80 TRACK DRIVE
  3034                              <1> 
  3035                              <1> ;	DRIVE IS A 360; SET DRIVE TO DETERMINED;
  3036                              <1> ;	SET MEDIA TO DETERMINED AT RATE 250.
  3037                              <1> 
  3038 000051B6 808F[25820100]94    <1> 	OR	byte [DSK_STATE+eDI], DRV_DET+MED_DET+RATE_250
  3039 000051BD C3                  <1> 	RETn				; ALL INFORMATION SET
  3040                              <1> IS_80:
  3041 000051BE 808F[25820100]01    <1> 	OR	byte [DSK_STATE+eDI], TRK_CAPA ; SETUP 80 TRACK CAPABILITY
  3042                              <1> DD_BAC:
  3043 000051C5 C3                  <1> 	RETn
  3044                              <1> POP_BAC:
  3045 000051C6 6659                <1> 	POP	CX			; THROW AWAY
  3046 000051C8 C3                  <1> 	RETn
  3047                              <1> 
  3048                              <1> fdc_int:  
  3049                              <1> 	  ; 30/07/2015	
  3050                              <1> 	  ; 16/02/2015
  3051                              <1> ;int_0Eh: ; 11/12/2014
  3052                              <1> 
  3053                              <1> ;--- HARDWARE INT 0EH -- ( IRQ LEVEL  6 ) --------------------------------------
  3054                              <1> ; DISK_INT
  3055                              <1> ;	THIS ROUTINE HANDLES THE DISKETTE INTERRUPT.
  3056                              <1> ;
  3057                              <1> ; ON EXIT:	THE INTERRUPT FLAG IS SET IN @SEEK_STATUS.
  3058                              <1> ;-------------------------------------------------------------------------------
  3059                              <1> DISK_INT_1:
  3060                              <1> 
  3061 000051C9 6650                <1> 	PUSH	AX			; SAVE WORK REGISTER
  3062 000051CB 1E                  <1> 	push	ds
  3063 000051CC 66B81000            <1> 	mov	ax, KDATA
  3064 000051D0 8ED8                <1> 	mov 	ds, ax
  3065 000051D2 800D[15820100]80    <1>         OR      byte [SEEK_STATUS], INT_FLAG ; TURN ON INTERRUPT OCCURRED
  3066 000051D9 B020                <1> 	MOV     AL,EOI                  ; END OF INTERRUPT MARKER
  3067 000051DB E620                <1> 	OUT	INTA00,AL		; INTERRUPT CONTROL PORT
  3068 000051DD 1F                  <1> 	pop	ds
  3069 000051DE 6658                <1> 	POP	AX			; RECOVER REGISTER
  3070 000051E0 CF                  <1> 	IRETd				; RETURN FROM INTERRUPT
  3071                              <1> 
  3072                              <1> ;-------------------------------------------------------------------------------
  3073                              <1> ; DSKETTE_SETUP
  3074                              <1> ;	THIS ROUTINE DOES A PRELIMINARY CHECK TO SEE WHAT TYPE OF
  3075                              <1> ;	DISKETTE DRIVES ARE ATTACH TO THE SYSTEM.
  3076                              <1> ;-------------------------------------------------------------------------------
  3077                              <1> 
  3078                              <1> ; 29/05/2016 - TRDOS 386 (TRDOS v2.0)
  3079                              <1> 
  3080                              <1> DSKETTE_SETUP:
  3081                              <1> 	;PUSH	AX			; SAVE REGISTERS
  3082                              <1> 	;PUSH	BX
  3083                              <1> 	;PUSH	CX
  3084 000051E1 52                  <1> 	PUSH	eDX
  3085                              <1> 	;PUSH	DI
  3086                              <1> 	;;PUSH	DS
  3087                              <1> 	; 14/12/2014
  3088                              <1> 	;mov	word [DISK_POINTER], MD_TBL6
  3089                              <1> 	;mov	[DISK_POINTER+2], cs
  3090                              <1> 	;
  3091                              <1> 	;OR	byte [RTC_WAIT_FLAG], 1	; NO RTC WAIT, FORCE USE OF LOOP
  3092 000051E2 31FF                <1> 	XOR	eDI,eDI			; INITIALIZE DRIVE POINTER
  3093 000051E4 66C705[25820100]00- <1> 	MOV	WORD [DSK_STATE],0	; INITIALIZE STATES
  3093 000051EC 00                  <1>
  3094 000051ED 8025[20820100]33    <1> 	AND	byte [LASTRATE],~(STRT_MSK+SEND_MSK) ; CLEAR START & SEND
  3095 000051F4 800D[20820100]C0    <1> 	OR	byte [LASTRATE],SEND_MSK ; INITIALIZE SENT TO IMPOSSIBLE
  3096 000051FB C605[15820100]00    <1> 	MOV	byte [SEEK_STATUS],0	; INDICATE RECALIBRATE NEEDED
  3097 00005202 C605[17820100]00    <1> 	MOV	byte [MOTOR_COUNT],0	; INITIALIZE MOTOR COUNT
  3098 00005209 C605[16820100]00    <1> 	MOV	byte [MOTOR_STATUS],0	; INITIALIZE DRIVES TO OFF STATE
  3099 00005210 C605[18820100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; NO ERRORS
  3100                              <1> 	;
  3101                              <1> 	; 28/02/2015
  3102                              <1> 	;mov	word [cfd], 100h 
  3103 00005217 E82BF2FFFF          <1> 	call	DSK_RESET
  3104 0000521C 5A                  <1> 	pop	edx
  3105 0000521D F8                  <1> 	clc	; 29/05/2016
  3106 0000521E C3                  <1> 	retn
  3107                              <1> 
  3108                              <1> ;SUP0:
  3109                              <1> ;	CALL	DRIVE_DET		; DETERMINE DRIVE
  3110                              <1> ;	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  3111                              <1> ;	; 02/01/2015
  3112                              <1> ;	;INC	DI			; POINT TO NEXT DRIVE
  3113                              <1> ;	;CMP	DI,MAX_DRV		; SEE IF DONE
  3114                              <1> ;	;JNZ	short SUP0		; REPEAT FOR EACH ORIVE
  3115                              <1> ;       cmp     byte [fd1_type], 0	
  3116                              <1> ;	jna	short sup1
  3117                              <1> ;	or	di, di
  3118                              <1> ;	jnz	short sup1
  3119                              <1> ;	inc	di
  3120                              <1> ;       jmp     short SUP0
  3121                              <1> ;sup1:
  3122                              <1> ;	MOV	byte [SEEK_STATUS],0	; FORCE RECALIBRATE
  3123                              <1> ;	;AND	byte [RTC_WAIT_FLAG],0FEH ; ALLOW FOR RTC WAIT
  3124                              <1> ;	CALL	SETUP_END		; VARIOUS CLEANUPS
  3125                              <1> ;	;;POP	DS			; RESTORE CALLERS REGISTERS
  3126                              <1> ;	;POP	DI
  3127                              <1> ;	POP	eDX
  3128                              <1> ;	;POP	CX
  3129                              <1> ;	;POP	BX
  3130                              <1> ;	;POP	AX
  3131                              <1> ;	RETn
  3132                              <1> 
  3133                              <1> ;//////////////////////////////////////////////////////
  3134                              <1> ;; END OF DISKETTE I/O ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  3135                              <1> ;
  3136                              <1> 
  3137                              <1> int13h: ; 21/02/2015
  3138 0000521F F8                  <1> 	clc ; 20/07/2020
  3139 00005220 9C                  <1> 	pushfd
  3140 00005221 0E                  <1> 	push 	cs
  3141 00005222 E848010000          <1> 	call 	DISK_IO
  3142 00005227 C3                  <1> 	retn
  3143                              <1> 
  3144                              <1> ;;;;;; DISK I/O ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 21/02/2015 ;;;
  3145                              <1> ;/////////////////////////////////////////////////////////////////////
  3146                              <1> 
  3147                              <1> ; DISK I/O - Erdogan Tan (Retro UNIX 386 v1 project)
  3148                              <1> ; 18/02/2016
  3149                              <1> ; 17/02/2016
  3150                              <1> ; 23/02/2015
  3151                              <1> ; 21/02/2015 (unix386.s)
  3152                              <1> ; 22/12/2014 - 14/02/2015 (dsectrm2.s)
  3153                              <1> ;
  3154                              <1> ; Original Source Code:
  3155                              <1> ; DISK ----- 09/25/85 FIXED DISK BIOS
  3156                              <1> ; (IBM PC XT Model 286 System BIOS Source Code, 04-21-86)
  3157                              <1> ;
  3158                              <1> ; Modifications: by reference of AWARD BIOS 1999 (D1A0622) 
  3159                              <1> ;		 Source Code - ATORGS.ASM, AHDSK.ASM
  3160                              <1> ;
  3161                              <1> 
  3162                              <1> 
  3163                              <1> ;The wait for controller to be not busy is 10 seconds.
  3164                              <1> ;10,000,000 / 30 = 333,333.  333,333 decimal = 051615h
  3165                              <1> ;;WAIT_HDU_CTLR_BUSY_LO	equ	1615h		
  3166                              <1> ;;WAIT_HDU_CTLR_BUSY_HI	equ	  05h
  3167                              <1> WAIT_HDU_CTRL_BUSY_LH	equ	51615h	 ;21/02/2015		
  3168                              <1> 
  3169                              <1> ;The wait for controller to issue completion interrupt is 10 seconds.
  3170                              <1> ;10,000,000 / 30 = 333,333.  333,333 decimal = 051615h
  3171                              <1> ;;WAIT_HDU_INT_LO	equ	1615h
  3172                              <1> ;;WAIT_HDU_INT_HI	equ	  05h
  3173                              <1> WAIT_HDU_INT_LH		equ	51615h	; 21/02/2015
  3174                              <1> 
  3175                              <1> ;The wait for Data request on read and write longs is
  3176                              <1> ;2000 us. (?)
  3177                              <1> ;;WAIT_HDU_DRQ_LO	equ	1000	; 03E8h
  3178                              <1> ;;WAIT_HDU_DRQ_HI	equ	0
  3179                              <1> WAIT_HDU_DRQ_LH		equ	1000	; 21/02/2015
  3180                              <1> 
  3181                              <1> ; Port 61h (PORT_B)
  3182                              <1> SYS1		equ	61h	; PORT_B  (diskette.inc)
  3183                              <1> 
  3184                              <1> ; 23/12/2014
  3185                              <1> %define CMD_BLOCK       eBP-8  ; 21/02/2015
  3186                              <1> 
  3187                              <1> ; 30/08/2020 - TRDOS 386 v2
  3188                              <1> 
  3189                              <1> ;--- INT 13H -------------------------------------------------------------------
  3190                              <1> ;									       :
  3191                              <1> ; FIXED DISK I/O INTERFACE						       :
  3192                              <1> ;									       :
  3193                              <1> ;	THIS INTERFACE PROVIDES ACCESS TO 5 1/4" FIXED DISKS THROUGH           :
  3194                              <1> ;	THE IBM FIXED DISK CONTROLLER.					       :
  3195                              <1> ;									       :
  3196                              <1> ;	THE  BIOS  ROUTINES  ARE  MEANT  TO  BE  ACCESSED  THROUGH	       :
  3197                              <1> ;	SOFTWARE  INTERRUPTS  ONLY.    ANY  ADDRESSES  PRESENT	IN	       :
  3198                              <1> ;	THESE  LISTINGS  ARE  INCLUDED	 ONLY	FOR  COMPLETENESS,	       :
  3199                              <1> ;	NOT  FOR  REFERENCE.  APPLICATIONS   WHICH  REFERENCE  ANY	       :
  3200                              <1> ;	ABSOLUTE  ADDRESSES  WITHIN  THE  CODE	SEGMENTS  OF  BIOS	       :
  3201                              <1> ;	VIOLATE  THE  STRUCTURE  AND  DESIGN  OF  BIOS. 		       :
  3202                              <1> ;									       :
  3203                              <1> ;------------------------------------------------------------------------------:
  3204                              <1> ;									       :
  3205                              <1> ; INPUT  (AH)= HEX COMMAND VALUE					       :
  3206                              <1> ;									       :
  3207                              <1> ;	(AH)= 00H  RESET DISK (DL = 80H,81H) / DISKETTE 		       :
  3208                              <1> ;	(AH)= 01H  READ THE STATUS OF THE LAST DISK OPERATION INTO (AL)        :
  3209                              <1> ;		    NOTE: DL < 80H - DISKETTE				       :
  3210                              <1> ;			  DL > 80H - DISK				       :
  3211                              <1> ;	(AH)= 02H  READ THE DESIRED SECTORS INTO MEMORY 		       :
  3212                              <1> ;	(AH)= 03H  WRITE THE DESIRED SECTORS FROM MEMORY		       :
  3213                              <1> ;	(AH)= 04H  VERIFY THE DESIRED SECTORS				       :
  3214                              <1> ;	(AH)= 05H  FORMAT THE DESIRED TRACK				       :
  3215                              <1> ;	(AH)= 06H  UNUSED						       :
  3216                              <1> ;	(AH)= 07H  UNUSED						       :
  3217                              <1> ;	(AH)= 08H  RETURN THE CURRENT DRIVE PARAMETERS			       :
  3218                              <1> ;	(AH)= 09H  INITIALIZE DRIVE PAIR CHARACTERISTICS		       :
  3219                              <1> ;		    INTERRUPT 41 POINTS TO DATA BLOCK FOR DRIVE 0	       :
  3220                              <1> ;		    INTERRUPT 46 POINTS TO DATA BLOCK FOR DRIVE 1	       :
  3221                              <1> ;	(AH)= 0AH  READ LONG						       :
  3222                              <1> ;	(AH)= 0BH  WRITE LONG  (READ & WRITE LONG ENCOMPASS 512 + 4 BYTES ECC) :
  3223                              <1> ;	(AH)= 0CH  SEEK 						       :
  3224                              <1> ;	(AH)= 0DH  ALTERNATE DISK RESET (SEE DL)			       :
  3225                              <1> ;	(AH)= 0EH  UNUSED						       :
  3226                              <1> ;	(AH)= 0FH  UNUSED						       :
  3227                              <1> ;	(AH)= 10H  TEST DRIVE READY					       :
  3228                              <1> ;	(AH)= 11H  RECALIBRATE						       :
  3229                              <1> ;	(AH)= 12H  UNUSED						       :
  3230                              <1> ;	(AH)= 13H  UNUSED						       :
  3231                              <1> ;	(AH)= 14H  CONTROLLER INTERNAL DIAGNOSTIC			       :
  3232                              <1> ;	(AH)= 15H  READ DASD TYPE					       :
  3233                              <1> ;									       :
  3234                              <1> ;-------------------------------------------------------------------------------
  3235                              <1> ;									       :
  3236                              <1> ;	REGISTERS USED FOR FIXED DISK OPERATIONS			       :
  3237                              <1> ;									       :
  3238                              <1> ;		(DL)	-  DRIVE NUMBER     (80H-81H FOR DISK. VALUE CHECKED)  :
  3239                              <1> ;		(DH)	-  HEAD NUMBER	    (0-15 ALLOWED, NOT VALUE CHECKED)  :
  3240                              <1> ;		(CH)	-  CYLINDER NUMBER  (0-1023, NOT VALUE CHECKED)(SEE CL):
  3241                              <1> ;		(CL)	-  SECTOR NUMBER    (1-17, NOT VALUE CHECKED)	       :
  3242                              <1> ;									       :
  3243                              <1> ;			   NOTE: HIGH 2 BITS OF CYLINDER NUMBER ARE PLACED     :
  3244                              <1> ;				 IN THE HIGH 2 BITS OF THE CL REGISTER	       :
  3245                              <1> ;				 (10 BITS TOTAL)			       :
  3246                              <1> ;									       :
  3247                              <1> ;		(AL)	-  NUMBER OF SECTORS (MAXIMUM POSSIBLE RANGE 1-80H,    :
  3248                              <1> ;					      FOR READ/WRITE LONG 1-79H)       :
  3249                              <1> ;									       :
  3250                              <1> ;		(ES:BX) -  ADDRESS OF BUFFER FOR READS AND WRITES,	       :
  3251                              <1> ;			   (NOT REQUIRED FOR VERIFY)			       :
  3252                              <1> ;									       :
  3253                              <1> ;		FORMAT (AH=5) ES:BX POINTS TO A 512 BYTE BUFFER. THE FIRST     :
  3254                              <1> ;			   2*(SECTORS/TRACK) BYTES CONTAIN F,N FOR EACH SECTOR.:
  3255                              <1> ;			   F = 00H FOR A GOOD SECTOR			       :
  3256                              <1> ;			       80H FOR A BAD SECTOR			       :
  3257                              <1> ;			   N = SECTOR NUMBER				       :
  3258                              <1> ;			   FOR AN INTERLEAVE OF 2 AND 17 SECTORS/TRACK	       :
  3259                              <1> ;			   THE TABLE SHOULD BE: 			       :
  3260                              <1> ;									       :
  3261                              <1> ;		   DB	   00H,01H,00H,0AH,00H,02H,00H,0BH,00H,03H,00H,0CH     :
  3262                              <1> ;		   DB	   00H,04H,00H,0DH,00H,05H,00H,0EH,00H,06H,00H,0FH     :
  3263                              <1> ;		   DB	   00H,07H,00H,10H,00H,08H,00H,11H,00H,09H	       :
  3264                              <1> ;									       :
  3265                              <1> ;-------------------------------------------------------------------------------
  3266                              <1> 
  3267                              <1> ;-------------------------------------------------------------------------------
  3268                              <1> ; OUTPUT								       :
  3269                              <1> ;	AH = STATUS OF CURRENT OPERATION				       :
  3270                              <1> ;	     STATUS BITS ARE DEFINED IN THE EQUATES BELOW		       :
  3271                              <1> ;	CY = 0	SUCCESSFUL OPERATION (AH=0 ON RETURN)			       :
  3272                              <1> ;	CY = 1	FAILED OPERATION (AH HAS ERROR REASON)			       :
  3273                              <1> ;									       :
  3274                              <1> ;	NOTE:	ERROR 11H  INDICATES THAT THE DATA READ HAD A RECOVERABLE      :
  3275                              <1> ;		ERROR WHICH WAS CORRECTED BY THE ECC ALGORITHM.  THE DATA      :
  3276                              <1> ;		IS PROBABLY GOOD,   HOWEVER THE BIOS ROUTINE INDICATES AN      :
  3277                              <1> ;		ERROR TO ALLOW THE CONTROLLING PROGRAM A CHANCE TO DECIDE      :
  3278                              <1> ;		FOR ITSELF.  THE  ERROR  MAY  NOT  RECUR  IF  THE DATA IS      :
  3279                              <1> ;		REWRITTEN.						       :
  3280                              <1> ;									       :
  3281                              <1> ;	IF DRIVE PARAMETERS WERE REQUESTED (DL >= 80H), 		       :
  3282                              <1> ;	   INPUT:							       :
  3283                              <1> ;	     (DL) = DRIVE NUMBER					       :	
  3284                              <1> ;	     ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)						       :	 	
  3285                              <1> ;	     EBX = Buffer address for fixed disk parameters table (32 bytes)   :
  3286                              <1> ;	   OUTPUT:							       :
  3287                              <1> ;	     (DL) = NUMBER OF CONSECUTIVE ACKNOWLEDGING DRIVES ATTACHED (1-2)  :
  3288                              <1> ;		    (CONTROLLER CARD ZERO TALLY ONLY)			       :
  3289                              <1> ;	     (DH) = MAXIMUM USEABLE VALUE FOR HEAD NUMBER		       :
  3290                              <1> ;	     (CH) = MAXIMUM USEABLE VALUE FOR CYLINDER NUMBER		       :
  3291                              <1> ;	     (CL) = MAXIMUM USEABLE VALUE FOR SECTOR NUMBER		       :
  3292                              <1> ;		    AND CYLINDER NUMBER HIGH BITS			       :
  3293                              <1> ;									       :
  3294                              <1> ;	IF READ DASD TYPE WAS REQUESTED,				       :
  3295                              <1> ;									       :
  3296                              <1> ;	AH = 0 - NOT PRESENT						       :
  3297                              <1> ;	     1 - DISKETTE - NO CHANGE LINE AVAILABLE			       :
  3298                              <1> ;	     2 - DISKETTE - CHANGE LINE AVAILABLE			       :
  3299                              <1> ;	     3 - FIXED DISK						       :
  3300                              <1> ;									       :
  3301                              <1> ;	CX,DX = NUMBER OF 512 BYTE BLOCKS WHEN AH = 3			       :
  3302                              <1> ;									       :
  3303                              <1> ;	REGISTERS WILL BE PRESERVED EXCEPT WHEN THEY ARE USED TO RETURN        :
  3304                              <1> ;	INFORMATION.							       :
  3305                              <1> ;									       :
  3306                              <1> ;	NOTE: IF AN ERROR IS REPORTED BY THE DISK CODE, THE APPROPRIATE        :
  3307                              <1> ;		ACTION IS TO RESET THE DISK, THEN RETRY THE OPERATION.	       :
  3308                              <1> ;									       :
  3309                              <1> ;-------------------------------------------------------------------------------
  3310                              <1> 
  3311                              <1> SENSE_FAIL	EQU	0FFH		; NOT IMPLEMENTED
  3312                              <1> NO_ERR		EQU	0E0H		; STATUS ERROR/ERROR REGISTER=0
  3313                              <1> WRITE_FAULT	EQU	0CCH		; WRITE FAULT ON SELECTED DRIVE
  3314                              <1> UNDEF_ERR	EQU	0BBH		; UNDEFINED ERROR OCCURRED
  3315                              <1> NOT_RDY 	EQU	0AAH		; DRIVE NOT READY
  3316                              <1> TIME_OUT	EQU	80H		; ATTACHMENT FAILED TO RESPOND
  3317                              <1> BAD_SEEK	EQU	40H		; SEEK OPERATION FAILED
  3318                              <1> BAD_CNTLR	EQU	20H		; CONTROLLER HAS FAILED
  3319                              <1> DATA_CORRECTED	EQU	11H		; ECC CORRECTED DATA ERROR
  3320                              <1> BAD_ECC 	EQU	10H		; BAD ECC ON DISK READ
  3321                              <1> BAD_TRACK	EQU	0BH		; NOT IMPLEMENTED
  3322                              <1> BAD_SECTOR	EQU	0AH		; BAD SECTOR FLAG DETECTED
  3323                              <1> ;DMA_BOUNDARY	EQU	09H		; DATA EXTENDS TOO FAR
  3324                              <1> INIT_FAIL	EQU	07H		; DRIVE PARAMETER ACTIVITY FAILED
  3325                              <1> BAD_RESET	EQU	05H		; RESET FAILED
  3326                              <1> ;RECORD_NOT_FND	EQU	04H		; REQUESTED SECTOR NOT FOUND
  3327                              <1> ;BAD_ADDR_MARK	EQU	02H		; ADDRESS MARK NOT FOUND
  3328                              <1> ;BAD_CMD 	EQU	01H		; BAD COMMAND PASSED TO DISK I/O
  3329                              <1> 
  3330                              <1> ;--------------------------------------------------------
  3331                              <1> ;							:
  3332                              <1> ; FIXED DISK PARAMETER TABLE				:
  3333                              <1> ;  -  THE TABLE IS COMPOSED OF A BLOCK DEFINED AS:	:
  3334                              <1> ;							:
  3335                              <1> ;  +0	(1 WORD) - MAXIMUM NUMBER OF CYLINDERS		:
  3336                              <1> ;  +2	(1 BYTE) - MAXIMUM NUMBER OF HEADS		:
  3337                              <1> ;  +3	(1 WORD) - NOT USED/SEE PC-XT			:
  3338                              <1> ;  +5	(1 WORD) - STARTING WRITE PRECOMPENSATION CYL	:
  3339                              <1> ;  +7	(1 BYTE) - MAXIMUM ECC DATA BURST LENGTH	:
  3340                              <1> ;  +8	(1 BYTE) - CONTROL BYTE 			:
  3341                              <1> ;		   BIT	  7 DISABLE RETRIES -OR-	:
  3342                              <1> ;		   BIT	  6 DISABLE RETRIES		:
  3343                              <1> ;		   BIT	  3 MORE THAN 8 HEADS		:
  3344                              <1> ;  +9	(3 BYTES)- NOT USED/SEE PC-XT			:
  3345                              <1> ; +12	(1 WORD) - LANDING ZONE 			:
  3346                              <1> ; +14	(1 BYTE) - NUMBER OF SECTORS/TRACK		:
  3347                              <1> ; +15	(1 BYTE) - RESERVED FOR FUTURE USE		:
  3348                              <1> ;							:
  3349                              <1> ;	 - TO DYNAMICALLY DEFINE A SET OF PARAMETERS	:
  3350                              <1> ;	   BUILD A TABLE FOR UP TO 15 TYPES AND PLACE	:
  3351                              <1> ;	   THE CORRESPONDING VECTOR INTO INTERRUPT 41	:
  3352                              <1> ;	   FOR DRIVE 0 AND INTERRUPT 46 FOR DRIVE 1.	:
  3353                              <1> ;							:
  3354                              <1> ;--------------------------------------------------------
  3355                              <1> 
  3356                              <1> ;--------------------------------------------------------
  3357                              <1> ;							:
  3358                              <1> ; HARDWARE SPECIFIC VALUES				:
  3359                              <1> ;							:
  3360                              <1> ;  -  CONTROLLER I/O PORT				:
  3361                              <1> ;							:
  3362                              <1> ;     > WHEN READ FROM: 				:
  3363                              <1> ;	HF_PORT+0 - READ DATA (FROM CONTROLLER TO CPU)	:
  3364                              <1> ;	HF_PORT+1 - GET ERROR REGISTER			:
  3365                              <1> ;	HF_PORT+2 - GET SECTOR COUNT			:
  3366                              <1> ;	HF_PORT+3 - GET SECTOR NUMBER			:
  3367                              <1> ;	HF_PORT+4 - GET CYLINDER LOW			:
  3368                              <1> ;	HF_PORT+5 - GET CYLINDER HIGH (2 BITS)		:
  3369                              <1> ;	HF_PORT+6 - GET SIZE/DRIVE/HEAD 		:
  3370                              <1> ;	HF_PORT+7 - GET STATUS REGISTER 		:
  3371                              <1> ;							:
  3372                              <1> ;     > WHEN WRITTEN TO:				:
  3373                              <1> ;	HF_PORT+0 - WRITE DATA (FROM CPU TO CONTROLLER) :
  3374                              <1> ;	HF_PORT+1 - SET PRECOMPENSATION CYLINDER	:
  3375                              <1> ;	HF_PORT+2 - SET SECTOR COUNT			:
  3376                              <1> ;	HF_PORT+3 - SET SECTOR NUMBER			:
  3377                              <1> ;	HF_PORT+4 - SET CYLINDER LOW			:
  3378                              <1> ;	HF_PORT+5 - SET CYLINDER HIGH (2 BITS)		:
  3379                              <1> ;	HF_PORT+6 - SET SIZE/DRIVE/HEAD 		:
  3380                              <1> ;	HF_PORT+7 - SET COMMAND REGISTER		:
  3381                              <1> ;							:
  3382                              <1> ;--------------------------------------------------------
  3383                              <1> 
  3384                              <1> ;HF_PORT 	EQU	01F0H	; DISK PORT
  3385                              <1> ;HF1_PORT	equ	0170h	
  3386                              <1> ;HF_REG_PORT	EQU	03F6H
  3387                              <1> ;HF1_REG_PORT	equ	0376h
  3388                              <1> 
  3389                              <1> HDC1_BASEPORT	equ	1F0h
  3390                              <1> HDC2_BASEPORT	equ	170h		
  3391                              <1> 
  3392                              <1> align 2
  3393                              <1> 
  3394                              <1> ;-----		STATUS REGISTER
  3395                              <1> 
  3396                              <1> ST_ERROR	EQU	00000001B	;
  3397                              <1> ST_INDEX	EQU	00000010B	;
  3398                              <1> ST_CORRCTD	EQU	00000100B	; ECC CORRECTION SUCCESSFUL
  3399                              <1> ST_DRQ		EQU	00001000B	;
  3400                              <1> ST_SEEK_COMPL	EQU	00010000B	; SEEK COMPLETE
  3401                              <1> ST_WRT_FLT	EQU	00100000B	; WRITE FAULT
  3402                              <1> ST_READY	EQU	01000000B	;
  3403                              <1> ST_BUSY 	EQU	10000000B	;
  3404                              <1> 
  3405                              <1> ;-----		ERROR REGISTER
  3406                              <1> 
  3407                              <1> ERR_DAM 	EQU	00000001B	; DATA ADDRESS MARK NOT FOUND
  3408                              <1> ERR_TRK_0	EQU	00000010B	; TRACK 0 NOT FOUND ON RECAL
  3409                              <1> ERR_ABORT	EQU	00000100B	; ABORTED COMMAND
  3410                              <1> ;		EQU	00001000B	; NOT USED
  3411                              <1> ERR_ID		EQU	00010000B	; ID NOT FOUND
  3412                              <1> ;		EQU	00100000B	; NOT USED
  3413                              <1> ERR_DATA_ECC	EQU	01000000B
  3414                              <1> ERR_BAD_BLOCK	EQU	10000000B
  3415                              <1> 
  3416                              <1> 
  3417                              <1> RECAL_CMD	EQU	00010000B	; DRIVE RECAL	(10H)
  3418                              <1> READ_CMD	EQU	00100000B	;	READ	(20H)
  3419                              <1> WRITE_CMD	EQU	00110000B	;	WRITE	(30H)
  3420                              <1> VERIFY_CMD	EQU	01000000B	;	VERIFY	(40H)
  3421                              <1> FMTTRK_CMD	EQU	01010000B	; FORMAT TRACK	(50H)
  3422                              <1> INIT_CMD	EQU	01100000B	;   INITIALIZE	(60H)
  3423                              <1> SEEK_CMD	EQU	01110000B	;	SEEK	(70H)
  3424                              <1> DIAG_CMD	EQU	10010000B	; DIAGNOSTIC	(90H)
  3425                              <1> SET_PARM_CMD	EQU	10010001B	; DRIVE PARMS	(91H)
  3426                              <1> NO_RETRIES	EQU	00000001B	; CHD MODIFIER	(01H)
  3427                              <1> ECC_MODE	EQU	00000010B	; CMD MODIFIER	(02H)
  3428                              <1> BUFFER_MODE	EQU	00001000B	; CMD MODIFIER	(08H)
  3429                              <1> 
  3430                              <1> ;MAX_FILE	EQU	2
  3431                              <1> ;S_MAX_FILE	EQU	2
  3432                              <1> MAX_FILE	equ	4		; 22/12/2014
  3433                              <1> S_MAX_FILE	equ	4		; 22/12/2014
  3434                              <1> 
  3435                              <1> DELAY_1 	EQU	25H		; DELAY FOR OPERATION COMPLETE
  3436                              <1> DELAY_2 	EQU	0600H		; DELAY FOR READY
  3437                              <1> DELAY_3 	EQU	0100H		; DELAY FOR DATA REQUEST
  3438                              <1> 
  3439                              <1> HF_FAIL 	EQU	08H		; CMOS FLAG IN BYTE 0EH
  3440                              <1> 
  3441                              <1> ;-----		COMMAND BLOCK REFERENCE
  3442                              <1> 
  3443                              <1> ;CMD_BLOCK      EQU     BP-8            ; @CMD_BLOCK REFERENCES BLOCK HEAD IN SS
  3444                              <1> 					;  (BP) POINTS TO COMMAND BLOCK TAIL
  3445                              <1> 					;	AS DEFINED BY THE "ENTER" PARMS
  3446                              <1> ; 19/12/2014
  3447                              <1> ORG_VECTOR	equ	4*13h		; INT 13h vector
  3448                              <1> DISK_VECTOR	equ	4*40h		; INT 40h vector (for floppy disks)
  3449                              <1> ;HDISK_INT	equ	4*76h		; Primary HDC - Hardware interrupt (IRQ14)
  3450                              <1> ;HDISK_INT1	equ	4*76h		; Primary HDC - Hardware interrupt (IRQ14)
  3451                              <1> ;HDISK_INT2	equ	4*77h		; Secondary HDC - Hardware interrupt (IRQ15)
  3452                              <1> ;HF_TBL_VEC	equ	4*41h		; Pointer to 1st fixed disk parameter table
  3453                              <1> ;HF1_TBL_VEC	equ	4*46h		; Pointer to 2nd fixed disk parameter table
  3454                              <1> 
  3455                              <1> align 2
  3456                              <1> 
  3457                              <1> ;----------------------------------------------------------------
  3458                              <1> ; FIXED DISK I/O SETUP						:
  3459                              <1> ;								:
  3460                              <1> ;  -  ESTABLISH TRANSFER VECTORS FOR THE FIXED DISK		:
  3461                              <1> ;  -  PERFORM POWER ON DIAGNOSTICS				:
  3462                              <1> ;     SHOULD AN ERROR OCCUR A "1701" MESSAGE IS DISPLAYED       :
  3463                              <1> ;								:
  3464                              <1> ;----------------------------------------------------------------
  3465                              <1> 
  3466                              <1> ; 29/05/2016 - TRDOS 386 (TRDOS v2.0)
  3467                              <1> 
  3468                              <1> DISK_SETUP:
  3469                              <1> 	;CLI
  3470                              <1> 	;;MOV	AX,ABS0 			; GET ABSOLUTE SEGMENT
  3471                              <1> 	;xor	ax,ax
  3472                              <1> 	;MOV	DS,AX				; SET SEGMENT REGISTER
  3473                              <1> 	;MOV	AX, [ORG_VECTOR] 		; GET DISKETTE VECTOR
  3474                              <1> 	;MOV	[DISK_VECTOR],AX		;  INTO INT 40H
  3475                              <1> 	;MOV	AX, [ORG_VECTOR+2]
  3476                              <1> 	;MOV	[DISK_VECTOR+2],AX
  3477                              <1> 	;MOV	word [ORG_VECTOR],DISK_IO	; FIXED DISK HANDLER
  3478                              <1> 	;MOV	[ORG_VECTOR+2],CS
  3479                              <1> 	; 1st controller (primary master, slave)   - IRQ 14
  3480                              <1> 	;;MOV	word [HDISK_INT],HD_INT		; FIXED DISK INTERRUPT
  3481                              <1> 	;mov	word [HDISK_INT1],HD_INT	;
  3482                              <1> 	;;MOV	[HDISK_INT+2],CS
  3483                              <1> 	;mov	[HDISK_INT1+2],CS
  3484                              <1> 	; 2nd controller (secondary master, slave) - IRQ 15
  3485                              <1> 	;mov	word [HDISK_INT2],HD1_INT	;
  3486                              <1> 	;mov	[HDISK_INT2+2],CS
  3487                              <1> 	;
  3488                              <1> 	;;MOV	word [HF_TBL_VEC],HD0_DPT	; PARM TABLE DRIVE 80
  3489                              <1> 	;;MOV	word [HF_TBL_VEC+2],DPT_SEGM
  3490                              <1> 	;;MOV	word [HF1_TBL_VEC],HD1_DPT	; PARM TABLE DRIVE 81
  3491                              <1> 	;;MOV	word [HF1_TBL_VEC+2],DPT_SEGM
  3492                              <1> 	;push	cs
  3493                              <1> 	;pop	ds
  3494                              <1> 	;mov	word [HDPM_TBL_VEC],HD0_DPT	; PARM TABLE DRIVE 80h
  3495                              <1> 	;mov	word [HDPM_TBL_VEC+2],DPT_SEGM
  3496 00005228 C705[30820100]0000- <1> 	mov 	dword [HDPM_TBL_VEC], (DPT_SEGM*16)+HD0_DPT
  3496 00005230 0900                <1>
  3497                              <1> 	;mov	word [HDPS_TBL_VEC],HD1_DPT	; PARM TABLE DRIVE 81h
  3498                              <1> 	;mov	word [HDPS_TBL_VEC+2],DPT_SEGM
  3499 00005232 C705[34820100]2000- <1> 	mov 	dword [HDPS_TBL_VEC], (DPT_SEGM*16)+HD1_DPT
  3499 0000523A 0900                <1>
  3500                              <1> 	;mov	word [HDSM_TBL_VEC],HD2_DPT	; PARM TABLE DRIVE 82h
  3501                              <1> 	;mov	word [HDSM_TBL_VEC+2],DPT_SEGM
  3502 0000523C C705[38820100]4000- <1> 	mov 	dword [HDSM_TBL_VEC], (DPT_SEGM*16)+HD2_DPT
  3502 00005244 0900                <1>
  3503                              <1> 	;mov	word [HDSS_TBL_VEC],HD3_DPT	; PARM TABLE DRIVE 83h
  3504                              <1> 	;mov	word [HDSS_TBL_VEC+2],DPT_SEGM
  3505 00005246 C705[3C820100]6000- <1> 	mov 	dword [HDSS_TBL_VEC], (DPT_SEGM*16)+HD3_DPT
  3505 0000524E 0900                <1>
  3506                              <1> 	;
  3507                              <1> 	;;IN	AL,INTB01		; TURN ON SECOND INTERRUPT CHIP
  3508                              <1> 	;;;AND	AL,0BFH
  3509                              <1> 	;;and	al, 3Fh			; enable IRQ 14 and IRQ 15
  3510                              <1> 	;;;JMP	$+2
  3511                              <1> 	;;IODELAY
  3512                              <1> 	;;OUT	INTB01,AL
  3513                              <1> 	;;IODELAY
  3514                              <1> 	;;IN	AL,INTA01		; LET INTERRUPTS PASS THRU TO
  3515                              <1> 	;;AND	AL,0FBH 		;  SECOND CHIP
  3516                              <1> 	;;;JMP	$+2
  3517                              <1> 	;;IODELAY
  3518                              <1> 	;;OUT	INTA01,AL
  3519                              <1> 	;
  3520                              <1> 	;STI
  3521                              <1> 	;;PUSH	DS			; MOVE ABS0 POINTER TO
  3522                              <1> 	;;POP	ES			; EXTRA SEGMENT POINTER
  3523                              <1> 	;;;CALL	DDS			; ESTABLISH DATA SEGMENT
  3524                              <1> 	;;MOV	byte [DISK_STATUS1],0 	; RESET THE STATUS INDICATOR
  3525                              <1> 	;;MOV	byte [HF_NUM],0		; ZERO NUMBER OF FIXED DISKS
  3526                              <1> 	;;MOV	byte [CONTROL_BYTE],0
  3527                              <1> 	;;MOV	byte [PORT_OFF],0	; ZERO CARD OFFSET
  3528                              <1> 	; 20/12/2014 - private code by Erdogan Tan
  3529                              <1> 		      ; (out of original PC-AT, PC-XT BIOS code)
  3530                              <1> 	;mov	si, hd0_type
  3531 00005250 BE[F06D0000]        <1> 	mov	esi, hd0_type
  3532                              <1> 	;mov	cx, 4
  3533 00005255 B904000000          <1> 	mov	ecx, 4
  3534                              <1> hde_l:
  3535 0000525A AC                  <1> 	lodsb
  3536 0000525B 3C80                <1> 	cmp	al, 80h			; 8?h = existing
  3537 0000525D 7206                <1> 	jb	short _L4
  3538 0000525F FE05[2C820100]      <1> 	inc	byte [HF_NUM]		; + 1 hard (fixed) disk drives
  3539                              <1> _L4: ; 26/02/2015
  3540 00005265 E2F3                <1> 	loop	hde_l	
  3541                              <1> ;_L4:					; 0 <= [HF_NUM] =< 4
  3542                              <1> ;L4:
  3543                              <1> 	; 
  3544                              <1> 	;; 31/12/2014 - cancel controller diagnostics here
  3545                              <1> 	;;;mov 	cx, 3  ; 26/12/2014 (Award BIOS 1999)
  3546                              <1> 	;;mov 	cl, 3
  3547                              <1> 	;;
  3548                              <1> 	;;MOV	DL,80H			; CHECK THE CONTROLLER
  3549                              <1> ;;hdc_dl:
  3550                              <1> 	;;MOV	AH,14H			; USE CONTROLLER DIAGNOSTIC COMMAND
  3551                              <1> 	;;INT	13H			; CALL BIOS WITH DIAGNOSTIC COMMAND
  3552                              <1> 	;;;JC	short CTL_ERRX		; DISPLAY ERROR MESSAGE IF BAD RETURN
  3553                              <1> 	;;;jc	short POD_DONE ;22/12/2014
  3554                              <1> 	;;jnc	short hdc_reset0
  3555                              <1> 	;;loop	hdc_dl
  3556                              <1> 	;;; 27/12/2014
  3557                              <1> 	;;stc
  3558                              <1> 	;;retn
  3559                              <1> 	;
  3560                              <1> ;;hdc_reset0:
  3561                              <1> 	; 18/01/2015
  3562 00005267 8A0D[2C820100]      <1> 	mov	cl, [HF_NUM]
  3563 0000526D 20C9                <1> 	and	cl, cl
  3564 0000526F 740E                <1> 	jz	short POD_DONE
  3565                              <1> 	;
  3566 00005271 B27F                <1> 	mov	dl, 7Fh
  3567                              <1> hdc_reset1:
  3568 00005273 FEC2                <1> 	inc	dl
  3569                              <1> 	;; 31/12/2015
  3570                              <1> 	;;push	dx
  3571                              <1> 	;;push	cx
  3572                              <1> 	;;push	ds
  3573                              <1> 	;;sub	ax, ax
  3574                              <1> 	;;mov	ds, ax
  3575                              <1> 	;;MOV	AX, [TIMER_LOW]		; GET START TIMER COUNTS
  3576                              <1> 	;;pop	ds
  3577                              <1> 	;;MOV	BX,AX
  3578                              <1> 	;;ADD	AX,6*182		; 60 SECONDS* 18.2
  3579                              <1> 	;;MOV	CX,AX
  3580                              <1> 	;;mov	word [wait_count], 0	; 22/12/2014 (reset wait counter)
  3581                              <1> 	;;
  3582                              <1> 	;; 31/12/2014 - cancel HD_RESET_1
  3583                              <1> 	;;CALL	HD_RESET_1		; SET UP DRIVE 0, (1,2,3)
  3584                              <1> 	;;pop	cx
  3585                              <1> 	;;pop	dx
  3586                              <1> 	;;
  3587                              <1> 	; 18/01/2015
  3588 00005275 B40D                <1> 	mov	ah, 0Dh ; ALTERNATE RESET
  3589                              <1> 	;int	13h
  3590 00005277 E8A3FFFFFF          <1> 	call	int13h
  3591 0000527C E2F5                <1> 	loop	hdc_reset1
  3592 0000527E F8                  <1> 	clc 	; 29/05/2016
  3593                              <1> POD_DONE:
  3594 0000527F C3                  <1> 	RETn
  3595                              <1> 
  3596                              <1> ;;-----	POD_ERROR
  3597                              <1> 
  3598                              <1> ;;CTL_ERRX:
  3599                              <1> ;	;MOV	SI,OFFSET F1782 	; CONTROLLER ERROR
  3600                              <1> ;	;CALL	SET_FAIL		; DO NOT IPL FROM DISK
  3601                              <1> ;	;CALL	E_MSG			; DISPLAY ERROR AND SET (BP) ERROR FLAG
  3602                              <1> ;	;JMP	short POD_DONE
  3603                              <1> 
  3604                              <1> ;;HD_RESET_1:
  3605                              <1> ;;	;PUSH	BX			; SAVE TIMER LIMITS
  3606                              <1> ;;	;PUSH	CX
  3607                              <1> ;;RES_1: MOV	AH,09H			; SET DRIVE PARAMETERS
  3608                              <1> ;;	INT	13H
  3609                              <1> ;;	JC	short RES_2
  3610                              <1> ;;	MOV	AH,11H			; RECALIBRATE DRIVE
  3611                              <1> ;;	INT	13H
  3612                              <1> ;;	JNC	short RES_CK		; DRIVE OK
  3613                              <1> ;;RES_2: ;CALL	POD_TCHK		; CHECK TIME OUT
  3614                              <1> ;;	cmp	word [wait_count], 6*182 ; waiting time (in timer ticks)
  3615                              <1> ;;					; (30 seconds)		
  3616                              <1> ;;	;cmc
  3617                              <1> ;;	;JNC	short RES_1
  3618                              <1> ;;	jb	short RES_1
  3619                              <1> ;;;RES_FL: ;MOV	SI,OFFSET F1781 	; INDICATE DISK 1 FAILURE;
  3620                              <1> ;;	;TEST	DL,1
  3621                              <1> ;;	;JNZ	RES_E1
  3622                              <1> ;;	;MOV	SI,OFFSET F1780 	; INDICATE DISK 0 FAILURE
  3623                              <1> ;;	;CALL	SET_FAIL		; DO NOT TRY TO IPL DISK 0
  3624                              <1> ;;	;JMP	SHORT RES_E1
  3625                              <1> ;;RES_ER: ; 22/12/2014
  3626                              <1> ;;RES_OK:
  3627                              <1> ;;	;POP	CX			; RESTORE TIMER LIMITS
  3628                              <1> ;;	;POP	BX
  3629                              <1> ;;	RETn
  3630                              <1> ;;
  3631                              <1> ;;RES_RS: MOV	AH,00H			; RESET THE DRIVE
  3632                              <1> ;;	INT	13H
  3633                              <1> ;;RES_CK: MOV	AH,08H			; GET MAX CYLINDER,HEAD,SECTOR
  3634                              <1> ;;	MOV	BL,DL			; SAVE DRIVE CODE
  3635                              <1> ;;	INT	13H
  3636                              <1> ;;	JC	short RES_ER
  3637                              <1> ;;	MOV	[NEC_STATUS],CX 	; SAVE MAX CYLINDER, SECTOR
  3638                              <1> ;;	MOV	DL,BL			; RESTORE DRIVE CODE
  3639                              <1> ;;RES_3: MOV	AX,0401H		; VERIFY THE LAST SECTOR
  3640                              <1> ;;	INT	13H
  3641                              <1> ;;	JNC	short RES_OK		; VERIFY OK
  3642                              <1> ;;	CMP	AH,BAD_SECTOR		; OK ALSO IF JUST ID READ
  3643                              <1> ;;	JE	short RES_OK
  3644                              <1> ;;	CMP	AH,DATA_CORRECTED
  3645                              <1> ;;	JE	short RES_OK
  3646                              <1> ;;	CMP	AH,BAD_ECC
  3647                              <1> ;;	JE	short RES_OK
  3648                              <1> ;;	;CALL	POD_TCHK		; CHECK FOR TIME OUT
  3649                              <1> ;;	cmp	word [wait_count], 6*182 ; waiting time (in timer ticks)
  3650                              <1> ;;					; (60 seconds)		
  3651                              <1> ;;	cmc
  3652                              <1> ;;	JC	short RES_ER		; FAILED
  3653                              <1> ;;	MOV	CX,[NEC_STATUS] 	; GET SECTOR ADDRESS, AND CYLINDER
  3654                              <1> ;;	MOV	AL,CL			; SEPARATE OUT SECTOR NUMBER
  3655                              <1> ;;	AND	AL,3FH
  3656                              <1> ;;	DEC	AL			; TRY PREVIOUS ONE
  3657                              <1> ;;	JZ	short RES_RS		; WE'VE TRIED ALL SECTORS ON TRACK
  3658                              <1> ;;	AND	CL,0C0H 		; KEEP CYLINDER BITS
  3659                              <1> ;;	OR	CL,AL			; MERGE SECTOR WITH CYLINDER BITS
  3660                              <1> ;;	MOV	[NEC_STATUS],CX 	; SAVE CYLINDER, NEW SECTOR NUMBER
  3661                              <1> ;;	JMP	short RES_3		; TRY AGAIN
  3662                              <1> ;;;RES_ER: MOV	SI,OFFSET F1791 	; INDICATE DISK 1 ERROR
  3663                              <1> ;;	;TEST	DL,1
  3664                              <1> ;;	;JNZ	short RES_E1
  3665                              <1> ;;	;MOV	SI,OFFSET F1790 	; INDICATE DISK 0 ERROR
  3666                              <1> ;;;RES_E1:
  3667                              <1> ;;	;CALL	E_MSG			; DISPLAY ERROR AND SET (BP) ERROR FLAG
  3668                              <1> ;;;RES_OK:
  3669                              <1> ;;	;POP	CX			; RESTORE TIMER LIMITS
  3670                              <1> ;;	;POP	BX
  3671                              <1> ;;	;RETn
  3672                              <1> ;
  3673                              <1> ;;SET_FAIL:
  3674                              <1> ;	;MOV	AX,X*(CMOS_DIAG+NMI)	; GET CMOS ERROR BYTE
  3675                              <1> ;	;CALL	CMOS_READ
  3676                              <1> ;	;OR	AL,HF_FAIL		; SET DO NOT IPL FROM DISK FLAG
  3677                              <1> ;	;XCHG	AH,AL			; SAVE IT
  3678                              <1> ;	;CALL	CMOS_WRITE		; PUT IT OUT
  3679                              <1> ;	;RETn
  3680                              <1> ;
  3681                              <1> ;;POD_TCHK:				; CHECK FOR 30 SECOND TIME OUT
  3682                              <1> ;	;POP	AX			; SAVE RETURN
  3683                              <1> ;	;POP	CX			; GET TIME OUT LIMITS
  3684                              <1> ;	;POP	BX
  3685                              <1> ;	;PUSH	BX			; AND SAVE THEM AGAIN
  3686                              <1> ;	;PUSH	CX
  3687                              <1> ;	;PUSH	AX
  3688                              <1> ;	;push	ds
  3689                              <1> ;	;xor	ax, ax
  3690                              <1> ;	;mov	ds, ax			; RESTORE RETURN
  3691                              <1> ;	;MOV	AX, [TIMER_LOW]		; AX = CURRENT TIME
  3692                              <1> ;	;				; BX = START TIME
  3693                              <1> ;	;				; CX = END TIME
  3694                              <1> ;	;pop	ds
  3695                              <1> ;	;CMP	BX,CX
  3696                              <1> ;	;JB	short TCHK1		; START < END
  3697                              <1> ;	;CMP	BX,AX
  3698                              <1> ;	;JB	short TCHKG		; END < START < CURRENT
  3699                              <1> ;	;JMP	SHORT TCHK2		; END, CURRENT < START
  3700                              <1> ;;TCHK1: CMP	AX,BX
  3701                              <1> ;;	JB	short TCHKNG		; CURRENT < START < END
  3702                              <1> ;;TCHK2: CMP	AX,CX
  3703                              <1> ;;	JB	short TCHKG		; START < CURRENT < END
  3704                              <1> ;;					; OR CURRENT < END < START
  3705                              <1> ;;TCHKNG: STC				; CARRY SET INDICATES TIME OUT
  3706                              <1> ;;	RETn
  3707                              <1> ;;TCHKG: CLC				; INDICATE STILL TIME
  3708                              <1> ;;	RETn
  3709                              <1> ;;
  3710                              <1> ;;int_13h:
  3711                              <1> 
  3712                              <1> ;----------------------------------------
  3713                              <1> ;	FIXED DISK BIOS ENTRY POINT	:
  3714                              <1> ;----------------------------------------
  3715                              <1> 
  3716                              <1> ; 30/08/2020
  3717                              <1> ; 29/08/2020
  3718                              <1> ; 15/01/2017
  3719                              <1> ; 14/01/2017
  3720                              <1> ; 07/01/2017
  3721                              <1> ; 02/01/2017
  3722                              <1> ; 01/06/2016
  3723                              <1> ; 16/05/2016, 27/05/2016, 28/05/2016, 29/05/2016
  3724                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  3725                              <1> int33h:  ; DISK I/O
  3726                              <1> 	; 29/05/2016
  3727 00005280 80642408FE          <1> 	and	byte [esp+8], 11111110b  ; clear carry bit of eflags register
  3728                              <1> 	; 16/05/2016
  3729 00005285 1E                  <1> 	push	ds
  3730 00005286 53                  <1> 	push	ebx ; user's buffer address (virtual)
  3731 00005287 66BB1000            <1> 	mov	bx, KDATA ; System (Kernel's) data segment
  3732 0000528B 8EDB                <1> 	mov	ds, bx
  3733                              <1> 
  3734                              <1> 	;;15/01/2017
  3735                              <1> 	; 14/01/2017
  3736                              <1> 	; 02/01/2017
  3737                              <1> 	;;mov	byte [intflg], 33h	; disk io interrupt 
  3738                              <1> 	;pop	ebx
  3739                              <1> 	;mov	[user_buffer], ebx		
  3740                              <1> 
  3741 0000528D 8F05[1C8E0100]      <1> 	pop	dword [user_buffer] ; 01/06/2016
  3742                              <1> 
  3743 00005293 C605[56870100]00    <1> 	mov	byte [scount], 0 ; sector count for transfer
  3744 0000529A 80FC03              <1> 	cmp	ah, 03h ; chs write
  3745 0000529D 7744                <1> 	ja	short int33h_2
  3746 0000529F 7407                <1> 	je	short int33h_0
  3747 000052A1 80FC02              <1> 	cmp	ah, 02h ; chs read
  3748 000052A4 726F                <1> 	jb	short int33h_5
  3749 000052A6 EB68                <1> 	jmp	short int33h_4
  3750                              <1> int33h_0:
  3751                              <1> 	; transfer user's buffer content to sector buffer
  3752 000052A8 51                  <1> 	push	ecx
  3753 000052A9 0FB6C8              <1> 	movzx	ecx, al
  3754                              <1> int33h_1:
  3755 000052AC 56                  <1> 	push	esi
  3756 000052AD 8B35[1C8E0100]      <1> 	mov	esi, [user_buffer]
  3757                              <1> 	; esi = user's buffer address (virtual, ebx)
  3758 000052B3 57                  <1> 	push	edi
  3759 000052B4 06                  <1> 	push	es
  3760 000052B5 50                  <1> 	push	eax
  3761 000052B6 66B81000            <1> 	mov	ax, KDATA
  3762 000052BA 8EC0                <1> 	mov	es, ax
  3763 000052BC BF00000700          <1> 	mov	edi, Cluster_Buffer
  3764 000052C1 C1E109              <1> 	shl	ecx, 9 ; * 512
  3765 000052C4 E845C00000          <1> 	call	transfer_from_user_buffer
  3766 000052C9 58                  <1> 	pop	eax
  3767 000052CA 07                  <1> 	pop	es
  3768 000052CB 5F                  <1> 	pop	edi
  3769 000052CC 5E                  <1> 	pop	esi
  3770 000052CD 59                  <1> 	pop	ecx
  3771 000052CE 7345                <1> 	jnc	short int33h_5
  3772 000052D0 8B1D[1C8E0100]      <1> 	mov	ebx, [user_buffer] ; 01/06/2016
  3773 000052D6 1F                  <1> 	pop	ds
  3774                              <1> 
  3775                              <1> 	;;15/01/2017
  3776                              <1> 	; 02/01/2017
  3777                              <1> 	;cli
  3778                              <1> 	;;mov	byte [ss:intflg], 0 ; 07/01/2017
  3779                              <1> 	;
  3780                              <1> 	; (*) 29/05/2016
  3781                              <1> 	; (*) retf 4 ; skip eflags on stack
  3782                              <1> 
  3783                              <1> 	; 29/05/2016 -set carry flag on stack-
  3784                              <1> 	; [esp] = EIP
  3785                              <1> 	; [esp+4] = CS
  3786                              <1> 	; [esp+8] = E-FLAGS
  3787 000052D7 804C240801          <1> 	or	byte [esp+8], 1  ; set carry bit of eflags register
  3788                              <1> 	; [esp+12] = ESP (user)
  3789                              <1> 	; [esp+16] = SS (User)
  3790 000052DC B8FF000000          <1> 	mov	eax, 0FFh ; Unknown error !?
  3791                              <1> 	;iretd
  3792 000052E1 EB7E                <1> 	jmp	short int33h_7  ; 07/01/2017	
  3793                              <1> 
  3794                              <1> 	; (*) 29/05/2016 - 'ref 4' intruction causes to stack fault
  3795                              <1> 	; (OUTER-PRIVILEGE-LEVEL)
  3796                              <1> 	; INTEL 80386 PROGRAMMER'S REFERENCE MANUAL 1986
  3797                              <1> 	; // RETF instruction:
  3798                              <1> 	;
  3799                              <1> 	; IF OperandMode=32 THEN
  3800                              <1>  	;    Load CS:EIP from stack;
  3801                              <1>  	;    Set CS RPL to CPL;
  3802                              <1>  	;    Increment eSP by 8 plus the immediate offset if it exists;
  3803                              <1>  	;    Load SS:eSP from stack;
  3804                              <1>  	; ELSE (* OperandMode=16 *)
  3805                              <1>  	;    Load CS:IP from stack;
  3806                              <1>  	;    Set CS RPL to CPL;
  3807                              <1>  	;    Increment eSP by 4 plus the immediate offset if it exists;
  3808                              <1> 	;    Load SS:eSP from stack;
  3809                              <1>  	; FI;
  3810                              <1> 	;
  3811                              <1> 	; //
  3812                              <1> 
  3813                              <1> int33h_2:
  3814 000052E3 80FC05              <1> 	cmp	ah, 05h ; format track
  3815 000052E6 770A                <1> 	ja	short int33h_3
  3816 000052E8 722B                <1> 	jb	short int33h_5
  3817 000052EA 51                  <1> 	push	ecx
  3818 000052EB B901000000          <1> 	mov	ecx, 1
  3819 000052F0 EBBA                <1> 	jmp	short int33h_1
  3820                              <1> int33h_3:
  3821 000052F2 80FC1C              <1> 	cmp	ah, 1Ch ; LBA write
  3822 000052F5 771E                <1> 	ja	short int33h_5
  3823 000052F7 74AF                <1> 	je	short int33h_0
  3824 000052F9 80FC1B              <1> 	cmp	ah, 1Bh ; LBA read
  3825 000052FC 7412                <1> 	je	short int33h_4
  3826                              <1> 	; 29/08/2020
  3827 000052FE 80FC08              <1> 	cmp	ah, 08h ; get disk parameters
  3828                              <1> 	;jne	short int33h_5
  3829 00005301 7405                <1> 	je	short int33h_10
  3830 00005303 80FC15              <1> 	cmp	ah, 15h	; read DASD type (get disk size)
  3831 00005306 750D                <1> 	jne	short int33h_5
  3832                              <1> int33h_10:
  3833                              <1> 	; 01/06/2016
  3834 00005308 8B1D[1C8E0100]      <1> 	mov	ebx, [user_buffer] ; user's buffer address
  3835 0000530E EB0A                <1> 	jmp	short int33h_6
  3836                              <1> int33h_4:
  3837 00005310 A2[56870100]        <1> 	mov	byte [scount], al ; <= 128 sectors
  3838                              <1> int33h_5:
  3839 00005315 BB00000700          <1> 	mov	ebx, Cluster_Buffer ; max. 65536 bytes
  3840                              <1> 				    ; buf. addr: 70000h	
  3841                              <1> 	;mov	byte [ClusterBuffer_Valid], 0
  3842                              <1> int33h_6:
  3843 0000531A 1F                  <1> 	pop	ds
  3844 0000531B 9C                  <1> 	pushfd
  3845 0000531C 0E                  <1> 	push 	cs
  3846 0000531D E84D000000          <1> 	call 	DISK_IO
  3847 00005322 2E8B1D[1C8E0100]    <1> 	mov	ebx, [CS:user_buffer] ; 01/06/2016
  3848 00005329 723D                <1> 	jc	short int33h_9
  3849                              <1> 	;
  3850 0000532B 2E803D[56870100]00  <1> 	cmp	byte [CS:scount], 0
  3851 00005333 762C                <1> 	jna	short int33h_7
  3852                              <1> 	;
  3853                              <1> 	; transfer sector buffer content to user's buffer
  3854 00005335 06                  <1> 	push	es
  3855 00005336 1E                  <1> 	push	ds
  3856 00005337 50                  <1> 	push	eax
  3857 00005338 66B81000            <1> 	mov	ax, KDATA
  3858 0000533C 8ED8                <1> 	mov	ds, ax
  3859 0000533E 8EC0                <1> 	mov	es, ax
  3860 00005340 51                  <1> 	push	ecx
  3861 00005341 56                  <1> 	push	esi
  3862 00005342 57                  <1> 	push	edi
  3863 00005343 0FB60D[56870100]    <1> 	movzx	ecx, byte [scount]
  3864 0000534A C1E109              <1> 	shl	ecx, 9 ; * 512 bytes
  3865 0000534D 89DF                <1> 	mov	edi, ebx ; user's buffer address
  3866 0000534F BE00000700          <1> 	mov	esi, Cluster_Buffer
  3867 00005354 E86BBF0000          <1> 	call	transfer_to_user_buffer
  3868 00005359 5F                  <1> 	pop	edi
  3869 0000535A 5E                  <1> 	pop	esi
  3870 0000535B 59                  <1> 	pop	ecx
  3871 0000535C 58                  <1> 	pop	eax
  3872 0000535D 1F                  <1> 	pop	ds
  3873 0000535E 07                  <1> 	pop	es
  3874 0000535F 7202                <1> 	jc	short int33h_8
  3875                              <1> int33h_7:
  3876 00005361 FA                  <1> 	cli
  3877                              <1> 	;;15/01/2017
  3878                              <1> 	;;mov	byte [ss:intflg], 0 ; 07/01/2017
  3879                              <1> 	; cf = 0  ; use eflags which is in stack
  3880 00005362 CF                  <1> 	iretd	
  3881                              <1> int33h_8:
  3882 00005363 B8FF000000          <1> 	mov	eax, 0FFh ; Unknown error !?
  3883                              <1> int33h_9:
  3884                              <1> 	; cf = 1
  3885                              <1> 
  3886                              <1> 	; (*) 29/05/2016	
  3887                              <1> 	; (*) retf 4 ; skip eflags on stack
  3888                              <1> 	; Note: This 'retf 4' was wrong, -it was causing
  3889                              <1> 	;       to stack errors in ring 3-
  3890                              <1> 	;	POP sequence of 'retf 4' is as
  3891                              <1> 	;       "eip, cs, eflags, esp, ss, +4 bytes" 
  3892                              <1>         ;       it is not as "eip, cs, +4 bytes, esp, ss" ! 
  3893                              <1> 
  3894                              <1> 	; 29/05/2016 -set carry flag on stack-
  3895 00005368 804C240801          <1> 	or	byte [esp+8], 1  ; set carry bit of eflags register
  3896                              <1> 	;iretd
  3897 0000536D EBF2                <1> 	jmp	short int33h_7 ; 07/01/2017
  3898                              <1> 
  3899                              <1> ; 30/08/2020
  3900                              <1> ; 09/12/2017
  3901                              <1> ; 29/05/2016
  3902                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
  3903                              <1> 
  3904                              <1> DISK_IO:
  3905 0000536F 80FA80              <1> 	CMP	DL,80H			; TEST FOR FIXED DISK DRIVE
  3906                              <1> 	;JAE	short A1		; YES, HANDLE HERE
  3907                              <1> 	;;;INT	40H			; DISKETTE HANDLER
  3908                              <1> 	;;call	int40h
  3909 00005372 0F82FFEFFFFF        <1> 	jb	DISKETTE_IO_1
  3910                              <1> ;RET_2:
  3911                              <1> 	;RETf	2			; BACK TO CALLER
  3912                              <1> ;	retf	4
  3913                              <1> A1:
  3914 00005378 FB                  <1> 	STI				; ENABLE INTERRUPTS
  3915                              <1> 	;; 04/01/2015
  3916                              <1> 	;;OR	AH,AH
  3917                              <1> 	;;JNZ	short A2
  3918                              <1> 	;;INT	40H			; RESET NEC WHEN AH=0
  3919                              <1> 	;;SUB	AH,AH
  3920 00005379 80FA83              <1> 	CMP	DL,(80H + S_MAX_FILE - 1) ; 83h ; 30/08/2020 
  3921                              <1> 	;JA	short RET_2
  3922 0000537C 7614                <1> 	jna	short _A0
  3923                              <1> 	; 29/05/2016
  3924 0000537E 1E                  <1> 	push	ds
  3925 0000537F 50                  <1> 	push	eax ; 30/08/2020 (ax --> eax)
  3926 00005380 66B81000            <1> 	mov	ax, KDATA
  3927 00005384 8ED8                <1> 	mov	ds, ax
  3928 00005386 58                  <1> 	pop	eax ; 
  3929 00005387 B4AA                <1>         mov     ah, 0AAh        ; Hard disk drive not ready !
  3930                              <1> 				; (Programmer's guide to AMIBIOS, 1992)
  3931 00005389 8825[2B820100]      <1> 	mov     byte [DISK_STATUS1], ah
  3932 0000538F 1F                  <1> 	pop	ds
  3933 00005390 EB38                <1> 	jmp	short RET_2
  3934                              <1> _A0:
  3935                              <1> 	; 18/01/2015
  3936 00005392 08E4                <1> 	or	ah,ah
  3937 00005394 743A                <1> 	jz	short A4
  3938 00005396 80FC0D              <1> 	cmp	ah,0Dh	; Alternate reset
  3939 00005399 7504                <1> 	jne	short A2
  3940 0000539B 28E4                <1> 	sub	ah,ah	; Reset
  3941 0000539D EB31                <1> 	jmp	short A4
  3942                              <1> A2:
  3943 0000539F 80FC08              <1> 	CMP	AH,08H			; GET PARAMETERS IS A SPECIAL CASE
  3944                              <1> 	;JNZ	short A3
  3945                              <1>         ;JMP    GET_PARM_N
  3946 000053A2 0F8452030000        <1> 	je	GET_PARM_N
  3947 000053A8 80FC15              <1> A3:	CMP	AH,15H			; READ DASD TYPE IS ALSO
  3948                              <1> 	;JNZ	short A4
  3949                              <1>         ;JMP    READ_DASD_TYPE
  3950 000053AB 0F84DB020000        <1>         je      READ_DASD_TYPE
  3951                              <1> 	; 02/02/2015
  3952 000053B1 80FC1D              <1> 	cmp	ah, 1Dh			;(Temporary for Retro UNIX 386 v1)
  3953                              <1> 	; 12/01/2015
  3954 000053B4 F5                  <1> 	cmc
  3955 000053B5 7319                <1> 	jnc	short A4
  3956                              <1> int33h_bad_cmd:
  3957                              <1> 	; 16/05/2016
  3958                              <1> 	; 30/01/2015
  3959                              <1> 	; 29/05/2016
  3960 000053B7 1E                  <1> 	push	ds
  3961 000053B8 6650                <1> 	push	ax
  3962 000053BA 66B81000            <1> 	mov	ax, KDATA
  3963 000053BE 8ED8                <1> 	mov	ds, ax
  3964 000053C0 6658                <1> 	pop	ax
  3965 000053C2 B401                <1> 	mov	ah, BAD_CMD
  3966 000053C4 8825[2B820100]      <1> 	mov     [DISK_STATUS1], ah ; BAD_CMD  ; COMMAND ERROR
  3967                              <1>         ;jmp	short RET_2
  3968                              <1> RET_2:
  3969                              <1> 	; (*) 29/05/2016
  3970                              <1> 	; (*) retf 4
  3971 000053CA 804C240801          <1> 	or	byte [esp+8], 1 ; set carry bit of eflags register
  3972 000053CF CF                  <1> 	iretd
  3973                              <1> A4:					; SAVE REGISTERS DURING OPERATION
  3974 000053D0 C8080000            <1> 	ENTER	8,0			; SAVE (BP) AND MAKE ROOM FOR @CMD_BLOCK
  3975 000053D4 53                  <1> 	PUSH	eBX			;  IN THE STACK, THE COMMAND BLOCK IS:
  3976 000053D5 51                  <1> 	PUSH	eCX			;   @CMD_BLOCK == BYTE PTR [BP]-8
  3977 000053D6 52                  <1> 	PUSH	eDX
  3978 000053D7 1E                  <1> 	PUSH	DS
  3979 000053D8 06                  <1> 	PUSH	ES
  3980 000053D9 56                  <1> 	PUSH	eSI
  3981 000053DA 57                  <1> 	PUSH	eDI
  3982                              <1> 	;;04/01/2015
  3983                              <1> 	;;OR	AH,AH			; CHECK FOR RESET
  3984                              <1> 	;;JNZ	short A5
  3985                              <1> 	;;MOV	DL,80H			; FORCE DRIVE 80 FOR RESET
  3986                              <1> ;;A5:	
  3987                              <1> 	;push	cs
  3988                              <1> 	;pop	ds
  3989                              <1> 	; 21/02/2015
  3990 000053DB 6650                <1> 	push	ax
  3991 000053DD 66B81000            <1> 	mov	ax, KDATA
  3992 000053E1 8ED8                <1> 	mov	ds, ax
  3993 000053E3 8EC0                <1> 	mov	es, ax	
  3994 000053E5 6658                <1> 	pop	ax
  3995 000053E7 E88D000000          <1> 	CALL	DISK_IO_CONT		; PERFORM THE OPERATION
  3996                              <1> 	;;CALL	DDS			; ESTABLISH SEGMENT
  3997 000053EC 8A25[2B820100]      <1> 	MOV	AH,[DISK_STATUS1]	; GET STATUS FROM OPERATION
  3998                              <1> 	;(*) CMP AH,1			; SET THE CARRY FLAG TO INDICATE
  3999                              <1> 	;(*) CMC			; SUCCESS OR FAILURE
  4000 000053F2 5F                  <1> 	POP	eDI			; RESTORE REGISTERS
  4001 000053F3 5E                  <1> 	POP	eSI
  4002 000053F4 07                  <1>         POP     ES
  4003 000053F5 1F                  <1>         POP     DS
  4004 000053F6 5A                  <1> 	POP	eDX
  4005 000053F7 59                  <1> 	POP	eCX
  4006 000053F8 5B                  <1> 	POP	eBX
  4007 000053F9 C9                  <1> 	LEAVE				; ADJUST (SP) AND RESTORE (BP)
  4008                              <1> 	;RETf	2			; THROW AWAY SAVED FLAGS
  4009                              <1> 	; (*) 29/05/2016
  4010                              <1> 	; (*) retf 4
  4011 000053FA 80FC01              <1> 	cmp	ah, 1
  4012 000053FD 7205                <1> 	jc	short _A5 
  4013 000053FF 804C240801          <1> 	or	byte [esp+8], 1 ; set carry bit of eflags register
  4014                              <1> _A5:
  4015 00005404 CF                  <1> 	iretd
  4016                              <1> 
  4017                              <1> ; 21/02/2015
  4018                              <1> ;       dw --> dd
  4019                              <1> D1:					; FUNCTION TRANSFER TABLE
  4020 00005405 [C8550000]          <1> 	dd	DISK_RESET		; 000H
  4021 00005409 [3F560000]          <1> 	dd	RETURN_STATUS		; 001H
  4022 0000540D [4C560000]          <1> 	dd	DISK_READ		; 002H
  4023 00005411 [55560000]          <1> 	dd	DISK_WRITE		; 003H
  4024 00005415 [5E560000]          <1> 	dd	DISK_VERF		; 004H
  4025 00005419 [76560000]          <1> 	dd	FMT_TRK 		; 005H
  4026 0000541D [BE550000]          <1> 	dd	BAD_COMMAND		; 006H	FORMAT BAD SECTORS
  4027 00005421 [BE550000]          <1> 	dd	BAD_COMMAND		; 007H	FORMAT DRIVE
  4028 00005425 [BE550000]          <1> 	dd	BAD_COMMAND		; 008H	RETURN PARAMETERS
  4029 00005429 [93570000]          <1> 	dd	INIT_DRV		; 009H
  4030 0000542D [F2570000]          <1> 	dd	RD_LONG 		; 00AH
  4031 00005431 [FB570000]          <1> 	dd	WR_LONG 		; 00BH
  4032 00005435 [04580000]          <1> 	dd	DISK_SEEK		; 00CH
  4033 00005439 [C8550000]          <1> 	dd	DISK_RESET		; 00DH
  4034 0000543D [BE550000]          <1> 	dd	BAD_COMMAND		; 00EH	READ BUFFER
  4035 00005441 [BE550000]          <1> 	dd	BAD_COMMAND		; 00FH	WRITE BUFFER
  4036 00005445 [2C580000]          <1> 	dd	TST_RDY 		; 010H
  4037 00005449 [50580000]          <1> 	dd	HDISK_RECAL		; 011H
  4038 0000544D [BE550000]          <1> 	dd	BAD_COMMAND		; 012H	MEMORY DIAGNOSTIC
  4039 00005451 [BE550000]          <1> 	dd	BAD_COMMAND		; 013H	DRIVE DIAGNOSTIC
  4040 00005455 [86580000]          <1> 	dd	CTLR_DIAGNOSTIC 	; 014H	CONTROLLER DIAGNOSTIC
  4041                              <1> 	; 02/02/2015 (Temporary - Retro UNIX 386 v1 - DISK I/O test)
  4042 00005459 [BE550000]          <1> 	dd	BAD_COMMAND		; 015h
  4043 0000545D [BE550000]          <1> 	dd	BAD_COMMAND		; 016h
  4044 00005461 [BE550000]          <1> 	dd	BAD_COMMAND		; 017h
  4045 00005465 [BE550000]          <1> 	dd	BAD_COMMAND		; 018h
  4046 00005469 [BE550000]          <1> 	dd	BAD_COMMAND		; 019h
  4047 0000546D [BE550000]          <1> 	dd	BAD_COMMAND		; 01Ah
  4048 00005471 [4C560000]          <1> 	dd	DISK_READ		; 01Bh ; LBA read
  4049 00005475 [55560000]          <1> 	dd	DISK_WRITE		; 01Ch ; LBA write
  4050                              <1> D1L     EQU    $ - D1
  4051                              <1> 
  4052                              <1> DISK_IO_CONT:
  4053                              <1> 	;;CALL	DDS			; ESTABLISH SEGMENT
  4054 00005479 80FC01              <1> 	CMP	AH,01H			; RETURN STATUS
  4055                              <1> 	;;JNZ	short SU0
  4056                              <1>         ;;JMP	RETURN_STATUS
  4057 0000547C 0F84BD010000        <1> 	je	RETURN_STATUS
  4058                              <1> SU0:
  4059 00005482 C605[2B820100]00    <1> 	MOV	byte [DISK_STATUS1],0 	; RESET THE STATUS INDICATOR
  4060                              <1> 	;;PUSH	BX			; SAVE DATA ADDRESS
  4061                              <1> 	;mov	si, bx ;; 14/02/2015
  4062 00005489 89DE                <1> 	mov	esi, ebx ; 21/02/2015
  4063 0000548B 8A1D[2C820100]      <1> 	MOV	BL,[HF_NUM]		; GET NUMBER OF DRIVES
  4064                              <1> 	;; 04/01/2015
  4065                              <1> 	;;PUSH	AX
  4066 00005491 80E27F              <1> 	AND	DL,7FH			; GET DRIVE AS 0 OR 1
  4067                              <1> 					; (get drive number as 0 to 3)
  4068 00005494 38D3                <1> 	CMP	BL,DL
  4069                              <1>         ;;JBE   BAD_COMMAND_POP         ; INVALID DRIVE
  4070 00005496 0F8622010000        <1>         jbe     BAD_COMMAND ;; 14/02/2015
  4071                              <1>         ;
  4072                              <1> 	;;03/01/2015
  4073 0000549C 29DB                <1> 	sub	ebx, ebx
  4074 0000549E 88D3                <1> 	mov	bl, dl
  4075                              <1> 	;sub	bh, bh
  4076 000054A0 883D[40820100]      <1> 	mov	[LBAMode], bh 	; 0
  4077                              <1> 	;;test	byte [bx+hd0_type], 1	; LBA ready ?
  4078                              <1> 	;test	byte [ebx+hd0_type], 1
  4079                              <1> 	;jz	short su1		; no
  4080                              <1> 	;inc	byte [LBAMode]
  4081                              <1> ;su1:
  4082                              <1> 	; 21/02/2015 (32 bit modification)
  4083                              <1> 	;04/01/2015
  4084 000054A6 6650                <1> 	push	ax ; ***
  4085                              <1> 	;PUSH	ES ; **
  4086 000054A8 6652                <1> 	PUSH	DX ; *
  4087 000054AA 6650                <1> 	push	ax
  4088 000054AC E8BB060000          <1> 	CALL	GET_VEC 		; GET DISK PARAMETERS
  4089                              <1> 	; 02/02/2015
  4090                              <1> 	;mov	ax, [ES:BX+16] ; I/O port base address (1F0h, 170h)
  4091 000054B1 668B4310            <1> 	mov	ax, [ebx+16]
  4092 000054B5 66A3[E06D0000]      <1> 	mov	[HF_PORT], ax
  4093                              <1> 	;mov	dx, [ES:BX+18] ; control port address (3F6h, 376h)
  4094 000054BB 668B5312            <1> 	mov	dx, [ebx+18]
  4095 000054BF 668915[E26D0000]    <1> 	mov	[HF_REG_PORT], dx
  4096                              <1> 	;mov	al, [ES:BX+20] ; head register upper nibble (A0h,B0h,E0h,F0h)
  4097 000054C6 8A4314              <1> 	mov	al, [ebx+20]
  4098                              <1> 	; 23/02/2015
  4099 000054C9 A840                <1> 	test	al, 40h	 ; LBA bit (bit 6)
  4100 000054CB 7406                <1> 	jz 	short su1
  4101 000054CD FE05[40820100]      <1> 	inc	byte [LBAMode] ; 1 
  4102                              <1> su1: 	 
  4103 000054D3 C0E804              <1> 	shr 	al, 4
  4104 000054D6 2401                <1> 	and	al, 1			
  4105 000054D8 A2[E46D0000]        <1> 	mov	[hf_m_s], al 
  4106                              <1> 	;
  4107                              <1> 	; 03/01/2015
  4108                              <1> 	;MOV	AL,byte [ES:BX+8]	; GET CONTROL BYTE MODIFIER
  4109 000054DD 8A4308              <1> 	mov	al, [ebx+8]
  4110                              <1> 	;MOV	DX,[HF_REG_PORT]	; Device Control register	
  4111 000054E0 EE                  <1> 	OUT	DX,AL			; SET EXTRA HEAD OPTION
  4112                              <1> 					; Control Byte:  (= 08h, here)
  4113                              <1> 					; bit 0 - 0
  4114                              <1> 					; bit 1 - nIEN (1 = disable irq)
  4115                              <1> 					; bit 2 - SRST (software RESET)
  4116                              <1> 					; bit 3 - use extra heads (8 to 15)
  4117                              <1> 					;         -always set to 1-	
  4118                              <1> 					; (bits 3 to 7 are reserved
  4119                              <1> 					;          for ATA devices)
  4120 000054E1 8A25[2D820100]      <1> 	MOV	AH,[CONTROL_BYTE]	; SET EXTRA HEAD OPTION IN
  4121 000054E7 80E4C0              <1> 	AND	AH,0C0H 		; CONTROL BYTE
  4122 000054EA 08C4                <1> 	OR	AH,AL
  4123 000054EC 8825[2D820100]      <1> 	MOV	[CONTROL_BYTE],AH	
  4124                              <1> 	; 04/01/2015
  4125 000054F2 6658                <1> 	pop	ax
  4126 000054F4 665A                <1> 	pop	dx ; * ;; 14/02/2015
  4127 000054F6 20E4                <1> 	and	ah, ah	; Reset function ?
  4128 000054F8 7507                <1> 	jnz	short su2
  4129                              <1> 	;;pop	dx ; * ;; 14/02/2015
  4130                              <1> 	;pop	es ; **
  4131 000054FA 6658                <1> 	pop	ax ; ***
  4132                              <1> 	;;pop	bx
  4133 000054FC E9C7000000          <1>         jmp     DISK_RESET
  4134                              <1> su2:
  4135 00005501 803D[40820100]00    <1> 	cmp	byte [LBAMode], 0
  4136 00005508 7662                <1> 	jna	short su3
  4137                              <1> 	;
  4138                              <1> 	; 02/02/2015 (LBA read/write function calls)
  4139 0000550A 80FC1B              <1> 	cmp	ah, 1Bh
  4140 0000550D 720B                <1> 	jb	short lbarw1
  4141 0000550F 80FC1C              <1> 	cmp	ah, 1Ch
  4142 00005512 775D                <1> 	ja 	short invldfnc
  4143                              <1> 	;;pop	dx ; * ; 14/02/2015
  4144                              <1> 	;mov	ax, cx ; Lower word of LBA address (bits 0-15)
  4145 00005514 89C8                <1> 	mov	eax, ecx ; LBA address (21/02/2015)
  4146                              <1> 	;; 14/02/2015
  4147 00005516 88D1                <1> 	mov	cl, dl ; 14/02/2015
  4148                              <1> 	;;mov	dx, bx
  4149                              <1> 	;mov	dx, si ; higher word of LBA address (bits 16-23)
  4150                              <1> 	;;mov	bx, di
  4151                              <1> 	;mov	si, di ; Buffer offset
  4152 00005518 EB32                <1> 	jmp	short lbarw2
  4153                              <1> lbarw1:
  4154                              <1> 	; convert CHS to LBA
  4155                              <1> 	;
  4156                              <1> 	; LBA calculation - AWARD BIOS - 1999 - AHDSK.ASM
  4157                              <1> 	; LBA = "# of Heads" * Sectors/Track * Cylinder + Head * Sectors/Track
  4158                              <1> 	;	+ Sector - 1
  4159 0000551A 6652                <1> 	push	dx ; * ;; 14/02/2015
  4160                              <1> 	;xor	dh, dh
  4161 0000551C 31D2                <1> 	xor	edx, edx
  4162                              <1> 	;mov	dl, [ES:BX+14]	; sectors per track (logical)
  4163 0000551E 8A530E              <1> 	mov	dl, [ebx+14]
  4164                              <1> 	;xor	ah, ah
  4165 00005521 31C0                <1> 	xor	eax, eax
  4166                              <1> 	;mov	al, [ES:BX+2]	; heads (logical) 	
  4167 00005523 8A4302              <1> 	mov	al, [ebx+2]
  4168 00005526 FEC8                <1> 	dec	al
  4169 00005528 6640                <1> 	inc	ax		; 0 =  256
  4170 0000552A 66F7E2              <1> 	mul 	dx
  4171                              <1> 		; AX = # of Heads" * Sectors/Track
  4172 0000552D 6689CA              <1> 	mov	dx, cx
  4173                              <1> 	;and	cx, 3Fh	 ; sector  (1 to 63)
  4174 00005530 83E13F              <1> 	and	ecx, 3fh
  4175 00005533 86D6                <1> 	xchg	dl, dh
  4176 00005535 C0EE06              <1> 	shr	dh, 6
  4177                              <1> 		; DX = cylinder (0 to 1023)
  4178                              <1> 	;mul 	dx
  4179                              <1> 		; DX:AX = # of Heads" * Sectors/Track * Cylinder
  4180 00005538 F7E2                <1> 	mul	edx
  4181 0000553A FEC9                <1> 	dec	cl  ; sector - 1
  4182                              <1> 	;add	ax, cx
  4183                              <1> 	;adc	dx, 0
  4184                              <1> 		; DX:AX = # of Heads" * Sectors/Track * Cylinder + Sector -1
  4185 0000553C 01C8                <1> 	add	eax, ecx
  4186 0000553E 6659                <1> 	pop	cx ; * ; ch = head, cl = drive number (zero based)
  4187                              <1> 	;push	dx
  4188                              <1> 	;push	ax
  4189 00005540 50                  <1> 	push	eax
  4190                              <1> 	;mov	al, [ES:BX+14]	; sectors per track (logical)	
  4191 00005541 8A430E              <1> 	mov	al, [ebx+14]
  4192 00005544 F6E5                <1> 	mul	ch
  4193                              <1> 		;  AX = Head * Sectors/Track
  4194 00005546 0FB7C0              <1>         movzx	eax, ax ; 09/12/2017
  4195                              <1> 	;pop	dx
  4196 00005549 5A                  <1> 	pop	edx
  4197                              <1> 	;add	ax, dx
  4198                              <1> 	;pop	dx
  4199                              <1> 	;adc	dx, 0 ; add carry bit
  4200 0000554A 01D0                <1> 	add	eax, edx
  4201                              <1> lbarw2:
  4202 0000554C 29D2                <1> 	sub	edx, edx ; 21/02/2015
  4203 0000554E 88CA                <1> 	mov	dl, cl ; 21/02/2015
  4204 00005550 C645F800            <1>         mov     byte [CMD_BLOCK], 0 ; Features Register
  4205                              <1> 				; NOTE: Features register (1F1h, 171h)
  4206                              <1> 				; is not used for ATA device R/W functions. 
  4207                              <1> 				; It is old/obsolete 'write precompensation'
  4208                              <1> 				; register and error register
  4209                              <1> 				; for old ATA/IDE devices.
  4210                              <1> 	; 18/01/2014
  4211                              <1> 	;mov	ch, [hf_m_s]	; Drive 0 (master) or 1 (slave)
  4212 00005554 8A0D[E46D0000]      <1> 	mov	cl, [hf_m_s]
  4213                              <1> 	;shl	ch, 4		; bit 4 (drive bit)
  4214                              <1> 	;or	ch, 0E0h	; bit 5 = 1
  4215                              <1> 				; bit 6 = 1 = LBA mode
  4216                              <1> 				; bit 7 = 1
  4217 0000555A 80C90E              <1> 	or	cl, 0Eh ; 1110b
  4218                              <1> 	;and	dh, 0Fh		; LBA byte 4 (bits 24 to 27)
  4219 0000555D 25FFFFFF0F          <1> 	and	eax, 0FFFFFFFh
  4220 00005562 C1E11C              <1> 	shl	ecx, 28 ; 21/02/2015
  4221                              <1> 	;or	dh, ch
  4222 00005565 09C8                <1> 	or	eax, ecx	
  4223                              <1> 	;;mov	[CMD_BLOCK+2], al ; LBA byte 1 (bits 0 to 7)
  4224                              <1> 				  ; (Sector Number Register)
  4225                              <1> 	;;mov	[CMD_BLOCK+3], ah ; LBA byte 2 (bits 8 to 15)
  4226                              <1> 				  ; (Cylinder Low Register)
  4227                              <1> 	;mov	[CMD_BLOCK+2], ax ; LBA byte 1, 2
  4228                              <1> 	;mov	[CMD_BLOCK+4], dl ; LBA byte 3 (bits 16 to 23)
  4229                              <1> 				  ; (Cylinder High Register)
  4230                              <1> 	;;mov	[CMD_BLOCK+5], dh ; LBA byte 4 (bits 24 to 27)
  4231                              <1> 				  ; (Drive/Head Register)
  4232                              <1> 	
  4233                              <1> 	;mov	[CMD_BLOCK+4], dx ; LBA byte 4, LBA & DEV select bits
  4234 00005567 8945FA              <1> 	mov	[CMD_BLOCK+2], eax ; 21/02/2015
  4235                              <1> 	;14/02/2015
  4236                              <1> 	;mov	dl, cl ; Drive number (INIT_DRV)		
  4237 0000556A EB38                <1> 	jmp	short su4
  4238                              <1> su3:
  4239                              <1> 	; 02/02/2015 
  4240                              <1> 	; (Temporary functions 1Bh & 1Ch are not valid for CHS mode) 
  4241 0000556C 80FC14              <1> 	cmp 	ah, 14h
  4242 0000556F 7604                <1> 	jna 	short chsfnc
  4243                              <1> invldfnc:
  4244                              <1>         ; 14/02/2015  
  4245                              <1> 	;pop	es ; **
  4246 00005571 6658                <1>         pop     ax ; ***
  4247                              <1>         ;jmp     short BAD_COMMAND_POP
  4248 00005573 EB49                <1>         jmp     short BAD_COMMAND
  4249                              <1> chsfnc:	
  4250                              <1> 	;MOV	AX,[ES:BX+5]		; GET WRITE PRE-COMPENSATION CYLINDER
  4251 00005575 668B4305            <1> 	mov	ax, [ebx+5]
  4252 00005579 66C1E802            <1> 	SHR	AX,2
  4253 0000557D 8845F8              <1> 	MOV	[CMD_BLOCK],AL
  4254                              <1> 	;;MOV	AL,[ES:BX+8]		; GET CONTROL BYTE MODIFIER
  4255                              <1> 	;;PUSH	DX
  4256                              <1> 	;;MOV	DX,[HF_REG_PORT]
  4257                              <1> 	;;OUT	DX,AL			; SET EXTRA HEAD OPTION
  4258                              <1> 	;;POP	DX ; * 
  4259                              <1> 	;;POP	ES ; **
  4260                              <1> 	;;MOV	AH,[CONTROL_BYTE]	; SET EXTRA HEAD OPTION IN
  4261                              <1> 	;;AND	AH,0C0H 		; CONTROL BYTE	
  4262                              <1> 	;;OR	AH,AL
  4263                              <1> 	;;MOV	[CONTROL_BYTE],AH
  4264                              <1> 	;
  4265 00005580 88C8                <1> 	MOV	AL,CL			; GET SECTOR NUMBER
  4266 00005582 243F                <1> 	AND	AL,3FH
  4267 00005584 8845FA              <1> 	MOV	[CMD_BLOCK+2],AL
  4268 00005587 886DFB              <1> 	MOV	[CMD_BLOCK+3],CH 	; GET CYLINDER NUMBER
  4269 0000558A 88C8                <1> 	MOV	AL,CL
  4270 0000558C C0E806              <1> 	SHR	AL,6
  4271 0000558F 8845FC              <1> 	MOV	[CMD_BLOCK+4],AL 	; CYLINDER HIGH ORDER 2 BITS
  4272                              <1> 	;;05/01/2015
  4273                              <1> 	;;MOV	AL,DL			; DRIVE NUMBER
  4274 00005592 A0[E46D0000]        <1> 	mov	al, [hf_m_s]
  4275 00005597 C0E004              <1> 	SHL	AL,4
  4276 0000559A 80E60F              <1> 	AND	DH,0FH			; HEAD NUMBER
  4277 0000559D 08F0                <1> 	OR	AL,DH
  4278                              <1> 	;OR	AL,80H or 20H
  4279 0000559F 0CA0                <1> 	OR	AL,80h+20h		; ECC AND 512 BYTE SECTORS
  4280 000055A1 8845FD              <1> 	MOV	[CMD_BLOCK+5],AL 	; ECC/SIZE/DRIVE/HEAD
  4281                              <1> su4:
  4282                              <1> 	;POP	ES ; **
  4283                              <1>         ;; 14/02/2015
  4284                              <1>         ;;POP   AX
  4285                              <1>         ;;MOV   [CMD_BLOCK+1],AL        ; SECTOR COUNT
  4286                              <1>         ;;PUSH  AX
  4287                              <1>         ;;MOV   AL,AH                   ; GET INTO LOW BYTE
  4288                              <1>         ;;XOR   AH,AH                   ; ZERO HIGH BYTE
  4289                              <1>         ;;SAL   AX,1                    ; *2 FOR TABLE LOOKUP
  4290 000055A4 6658                <1>         pop     ax ; ***
  4291 000055A6 8845F9              <1>         mov     [CMD_BLOCK+1], al
  4292 000055A9 29DB                <1>         sub	ebx, ebx
  4293 000055AB 88E3                <1> 	mov     bl, ah
  4294                              <1>         ;xor     bh, bh
  4295                              <1>         ;sal     bx, 1
  4296 000055AD 66C1E302            <1>         sal	bx, 2	; 32 bit offset (21/02/2015)
  4297                              <1> 	;;MOV   SI,AX                   ; PUT INTO SI FOR BRANCH
  4298                              <1>         ;;CMP   AX,D1L                  ; TEST WITHIN RANGE
  4299                              <1>         ;;JNB   short BAD_COMMAND_POP
  4300                              <1>         ;cmp     bx, D1L
  4301 000055B1 83FB74              <1> 	cmp	ebx, D1L
  4302 000055B4 7308                <1> 	jnb	short BAD_COMMAND
  4303                              <1>         ;xchg    bx, si
  4304 000055B6 87DE                <1>         xchg	ebx, esi
  4305                              <1> 	;;;POP	AX			; RESTORE AX
  4306                              <1> 	;;;POP	BX			; AND DATA ADDRESS
  4307                              <1> 	
  4308                              <1> 	;;PUSH	CX
  4309                              <1> 	;;PUSH	AX			; ADJUST ES:BX
  4310                              <1> 	;MOV	CX,BX			; GET 3 HIGH ORDER NIBBLES OF BX
  4311                              <1> 	;SHR	CX,4
  4312                              <1> 	;MOV	AX,ES
  4313                              <1> 	;ADD	AX,CX
  4314                              <1> 	;MOV	ES,AX
  4315                              <1> 	;AND	BX,000FH		; ES:BX CHANGED TO ES:000X
  4316                              <1> 	;;POP	AX
  4317                              <1> 	;;POP	CX
  4318                              <1> 	;;JMP	word [CS:SI+D1]
  4319                              <1> 	;jmp	word [SI+D1]
  4320 000055B8 FFA6[05540000]      <1> 	jmp	dword [esi+D1]
  4321                              <1> ;;BAD_COMMAND_POP:
  4322                              <1> ;;	POP	AX
  4323                              <1> ;;	POP	BX
  4324                              <1> BAD_COMMAND:
  4325 000055BE C605[2B820100]01    <1>         MOV     byte [DISK_STATUS1],BAD_CMD  ; COMMAND ERROR
  4326 000055C5 B000                <1> 	MOV	AL,0
  4327 000055C7 C3                  <1> 	RETn
  4328                              <1> 
  4329                              <1> ;----------------------------------------
  4330                              <1> ;	RESET THE DISK SYSTEM  (AH=00H) :
  4331                              <1> ;----------------------------------------
  4332                              <1> 
  4333                              <1> ; 18-1-2015 : one controller reset (not other one)
  4334                              <1> 
  4335                              <1> DISK_RESET:
  4336 000055C8 FA                  <1> 	CLI
  4337 000055C9 E4A1                <1> 	IN	AL,INTB01		; GET THE MASK REGISTER
  4338                              <1> 	;JMP	$+2
  4339                              <1> 	IODELAY
  4339 000055CB EB00                <2>  jmp short $+2
  4339 000055CD EB00                <2>  jmp short $+2
  4340                              <1> 	;AND	AL,0BFH 		; ENABLE FIXED DISK INTERRUPT
  4341 000055CF 243F                <1> 	and	al,3Fh			; 22/12/2014 (IRQ 14 & IRQ 15)
  4342 000055D1 E6A1                <1> 	OUT	INTB01,AL
  4343 000055D3 FB                  <1> 	STI				; START INTERRUPTS
  4344                              <1> 	; 14/02/2015
  4345 000055D4 6689D7              <1> 	mov	di, dx	
  4346                              <1> 	; 04/01/2015
  4347                              <1> 	;xor	di,di
  4348                              <1> drst0:
  4349 000055D7 B004                <1> 	MOV	AL,04H  ; bit 2 - SRST 
  4350                              <1> 	;MOV	DX,HF_REG_PORT
  4351 000055D9 668B15[E26D0000]    <1> 	MOV	DX,[HF_REG_PORT]
  4352 000055E0 EE                  <1> 	OUT	DX,AL			; RESET
  4353                              <1> ;	MOV	CX,10			; DELAY COUNT
  4354                              <1> ;DRD:	DEC	CX
  4355                              <1> ;	JNZ	short DRD		; WAIT 4.8 MICRO-SEC
  4356                              <1> 	;mov	cx,2			; wait for 30 micro seconds	
  4357 000055E1 B902000000          <1>         mov	ecx, 2 ; 21/02/2015
  4358 000055E6 E851CEFFFF          <1> 	call    WAITF                   ; (Award Bios 1999 - WAIT_REFRESH,
  4359                              <1>                                         ; 40 micro seconds)
  4360 000055EB A0[2D820100]        <1> 	mov	al,[CONTROL_BYTE]
  4361 000055F0 240F                <1> 	AND	AL,0FH			; SET HEAD OPTION
  4362 000055F2 EE                  <1> 	OUT	DX,AL			; TURN RESET OFF
  4363 000055F3 E86A040000          <1> 	CALL	NOT_BUSY
  4364 000055F8 7515                <1> 	JNZ	short DRERR		; TIME OUT ON RESET
  4365 000055FA 668B15[E06D0000]    <1> 	MOV	DX,[HF_PORT]
  4366 00005601 FEC2                <1> 	inc	dl  ; HF_PORT+1
  4367                              <1> 	; 02/01/2015 - Award BIOS 1999 - AHDSK.ASM
  4368                              <1>         ;mov     cl, 10
  4369 00005603 B90A000000          <1>         mov     ecx, 10 ; 21/02/2015 
  4370                              <1> drst1:
  4371 00005608 EC                  <1> 	IN	AL,DX			; GET RESET STATUS
  4372 00005609 3C01                <1> 	CMP	AL,1
  4373                              <1> 	; 04/01/2015
  4374 0000560B 740A                <1> 	jz	short drst2
  4375                              <1> 	;JNZ	short DRERR		; BAD RESET STATUS
  4376                              <1>         	; Drive/Head Register - bit 4
  4377 0000560D E2F9                <1> 	loop	drst1
  4378                              <1> DRERR:	
  4379 0000560F C605[2B820100]05    <1> 	MOV	byte [DISK_STATUS1],BAD_RESET ; CARD FAILED
  4380 00005616 C3                  <1> 	RETn
  4381                              <1> drst2:
  4382                              <1> 	; 14/02/2015
  4383 00005617 6689FA              <1> 	mov	dx,di
  4384                              <1> ;drst3:
  4385                              <1> ;	; 05/01/2015
  4386                              <1> ;	shl 	di,1
  4387                              <1> ;	; 04/01/2015
  4388                              <1> ;	mov	ax,[di+hd_cports]
  4389                              <1> ;	cmp	ax,[HF_REG_PORT]
  4390                              <1> ;	je	short drst4
  4391                              <1> ;	mov	[HF_REG_PORT], ax
  4392                              <1> ;	; 03/01/2015
  4393                              <1> ;	mov	ax,[di+hd_ports]
  4394                              <1> ;       mov     [HF_PORT], ax
  4395                              <1> ;	; 05/01/2014
  4396                              <1> ;	shr	di,1
  4397                              <1> ;	; 04/01/2015
  4398                              <1> ;	jmp	short drst0	; reset other controller
  4399                              <1> ;drst4:
  4400                              <1> ;	; 05/01/2015
  4401                              <1> ;	shr	di,1
  4402                              <1> ;	mov	al,[di+hd_dregs]
  4403                              <1> ;	and	al,10h ; bit 4 only
  4404                              <1> ;	shr	al,4 ; bit 4  -> bit 0
  4405                              <1> ;	mov	[hf_m_s], al ; (0 = master, 1 = slave)
  4406                              <1> 	;
  4407 0000561A A0[E46D0000]        <1> 	mov	al, [hf_m_s] ; 18/01/2015
  4408 0000561F A801                <1> 	test	al,1
  4409                              <1> ;	jnz	short drst6
  4410 00005621 7516                <1>         jnz     short drst4
  4411 00005623 8065FDEF            <1> 	AND     byte [CMD_BLOCK+5],0EFH ; SET TO DRIVE 0
  4412                              <1> ;drst5:
  4413                              <1> drst3:
  4414 00005627 E867010000          <1> 	CALL	INIT_DRV		; SET MAX HEADS
  4415                              <1> 	;mov	dx,di
  4416 0000562C E81F020000          <1> 	CALL	HDISK_RECAL		; RECAL TO RESET SEEK SPEED
  4417                              <1> 	; 04/01/2014
  4418                              <1> ;	inc	di
  4419                              <1> ;	mov	dx,di
  4420                              <1> ;	cmp	dl,[HF_NUM]
  4421                              <1> ;	jb	short drst3
  4422                              <1> ;DRE:
  4423 00005631 C605[2B820100]00    <1> 	MOV	byte [DISK_STATUS1],0 	; IGNORE ANY SET UP ERRORS
  4424 00005638 C3                  <1> 	RETn
  4425                              <1> ;drst6:
  4426                              <1> drst4:		; Drive/Head Register - bit 4
  4427 00005639 804DFD10            <1> 	OR      byte [CMD_BLOCK+5],010H ; SET TO DRIVE 1     
  4428                              <1>         ;jmp    short drst5
  4429 0000563D EBE8                <1>         jmp     short drst3
  4430                              <1> 
  4431                              <1> ;----------------------------------------
  4432                              <1> ;	DISK STATUS ROUTINE  (AH = 01H) :
  4433                              <1> ;----------------------------------------
  4434                              <1> 
  4435                              <1> RETURN_STATUS:
  4436 0000563F A0[2B820100]        <1> 	MOV	AL,[DISK_STATUS1]	; OBTAIN PREVIOUS STATUS
  4437 00005644 C605[2B820100]00    <1>         MOV     byte [DISK_STATUS1],0   ; RESET STATUS
  4438 0000564B C3                  <1> 	RETn
  4439                              <1> 
  4440                              <1> ;----------------------------------------
  4441                              <1> ;	DISK READ ROUTINE    (AH = 02H) :
  4442                              <1> ;----------------------------------------
  4443                              <1> 
  4444                              <1> DISK_READ:
  4445 0000564C C645FE20            <1> 	MOV	byte [CMD_BLOCK+6],READ_CMD
  4446 00005650 E986020000          <1>         JMP     COMMANDI
  4447                              <1> 
  4448                              <1> ;----------------------------------------
  4449                              <1> ;	DISK WRITE ROUTINE   (AH = 03H) :
  4450                              <1> ;----------------------------------------
  4451                              <1> 
  4452                              <1> DISK_WRITE:
  4453 00005655 C645FE30            <1> 	MOV	byte [CMD_BLOCK+6],WRITE_CMD
  4454 00005659 E9D8020000          <1>         JMP     COMMANDO
  4455                              <1> 
  4456                              <1> ;----------------------------------------
  4457                              <1> ;	DISK VERIFY	     (AH = 04H) :
  4458                              <1> ;----------------------------------------
  4459                              <1> 
  4460                              <1> DISK_VERF:
  4461 0000565E C645FE40            <1> 	MOV	byte [CMD_BLOCK+6],VERIFY_CMD
  4462 00005662 E846030000          <1> 	CALL	COMMAND
  4463 00005667 750C                <1> 	JNZ	short VERF_EXIT		; CONTROLLER STILL BUSY
  4464 00005669 E8B8030000          <1> 	CALL	_WAIT			; (Original: CALL WAIT)	
  4465 0000566E 7505                <1> 	JNZ	short VERF_EXIT		; TIME OUT
  4466 00005670 E845040000          <1> 	CALL	CHECK_STATUS
  4467                              <1> VERF_EXIT:
  4468 00005675 C3                  <1> 	RETn
  4469                              <1> 
  4470                              <1> ;----------------------------------------
  4471                              <1> ;	FORMATTING	     (AH = 05H) :
  4472                              <1> ;----------------------------------------
  4473                              <1> 
  4474                              <1> FMT_TRK:				; FORMAT TRACK	(AH = 005H)
  4475 00005676 C645FE50            <1> 	MOV	byte [CMD_BLOCK+6],FMTTRK_CMD
  4476                              <1> 	;PUSH	ES
  4477                              <1> 	;PUSH	BX
  4478 0000567A 53                  <1> 	push	ebx
  4479 0000567B E8EC040000          <1> 	CALL	GET_VEC 		; GET DISK PARAMETERS ADDRESS
  4480                              <1> 	;MOV	AL,[ES:BX+14]		; GET SECTORS/TRACK
  4481 00005680 8A430E              <1> 	mov	al, [ebx+14]
  4482 00005683 8845F9              <1> 	MOV	[CMD_BLOCK+1],AL 	; SET SECTOR COUNT IN COMMAND
  4483 00005686 5B                  <1> 	pop	ebx
  4484                              <1> 	;POP	BX
  4485                              <1> 	;POP	ES
  4486 00005687 E9B1020000          <1>         JMP     CMD_OF                  ; GO EXECUTE THE COMMAND
  4487                              <1> 
  4488                              <1> ; 30/08/2020
  4489                              <1> 
  4490                              <1> ;----------------------------------------
  4491                              <1> ;	READ DASD TYPE	     (AH = 15H) :
  4492                              <1> ;----------------------------------------
  4493                              <1> 
  4494                              <1> READ_DASD_TYPE:
  4495                              <1> READ_D_T:				; GET DRIVE PARAMETERS
  4496 0000568C 1E                  <1> 	PUSH	DS			; SAVE REGISTERS
  4497                              <1> 	;PUSH	ES
  4498 0000568D 53                  <1> 	PUSH	eBX
  4499                              <1> 	;CALL	DDS			; ESTABLISH ADDRESSING
  4500                              <1> 	;push	cs
  4501                              <1> 	;pop	ds
  4502 0000568E 66BB1000            <1>         mov	bx, KDATA
  4503 00005692 8EDB                <1> 	mov	ds, bx
  4504                              <1> 	;mov	es, bx
  4505 00005694 C605[2B820100]00    <1> 	MOV     byte [DISK_STATUS1],0
  4506 0000569B 8A1D[2C820100]      <1> 	MOV	BL,[HF_NUM]		; GET NUMBER OF DRIVES
  4507 000056A1 80E27F              <1> 	AND	DL,7FH			; GET DRIVE NUMBER
  4508 000056A4 38D3                <1> 	CMP	BL,DL
  4509 000056A6 763C                <1> 	JBE	short RDT_NOT_PRESENT 	; RETURN DRIVE NOT PRESENT
  4510 000056A8 0FB6C2              <1> 	movzx	eax, dl ; 28/08/2020
  4511 000056AB E8BC040000          <1> 	CALL	GET_VEC 		; GET DISK PARAMETERS ADDRESS
  4512                              <1> 	
  4513                              <1> 	; 28/08/2020 - TRDOS 386 v2
  4514 000056B0 F6431440            <1> 	test	byte [ebx+20], 40h	; LBA bit (bit 6)
  4515 000056B4 751D                <1> 	jnz	short RDT3 ; LBA disk (may be > 8GB)
  4516                              <1> 
  4517                              <1> 	;MOV	AL,[ES:BX+2]		; HEADS
  4518 000056B6 8A4302              <1> 	mov	al, [ebx+2]
  4519                              <1> 	;MOV	CL,[ES:BX+14]
  4520 000056B9 8A4B0E              <1> 	mov	cl, [ebx+14]
  4521 000056BC F6E9                <1> 	IMUL	CL			; * NUMBER OF SECTORS
  4522                              <1> 	;MOV	CX,[ES:BX]		; MAX NUMBER OF CYLINDERS
  4523 000056BE 668B0B              <1> 	mov	cx, [ebx]
  4524                              <1> 	;
  4525                              <1> 	; 02/01/2015 
  4526                              <1> 	; ** leave the last cylinder as reserved for diagnostics **
  4527                              <1> 	; (Also in Award BIOS - 1999, AHDSK.ASM, FUN15 -> sub ax, 1)
  4528 000056C1 6649                <1> 	DEC	CX			; LEAVE ONE FOR DIAGNOSTICS
  4529                              <1> 	;
  4530 000056C3 66F7E9              <1> 	IMUL	CX			; NUMBER OF SECTORS
  4531 000056C6 6689D1              <1> 	MOV	CX,DX			; HIGH ORDER HALF
  4532 000056C9 6689C2              <1> 	MOV	DX,AX			; LOW ORDER HALF
  4533                              <1> 	;SUB	AX,AX
  4534                              <1> 	; 28/08/2020
  4535                              <1> 	;sub	al, al
  4536                              <1> RDT4:
  4537 000056CC 29C0                <1> 	sub	eax, eax ; 28/08/2020
  4538                              <1> 	;
  4539 000056CE B403                <1> 	MOV	AH,03H			; INDICATE FIXED DISK
  4540                              <1> 	; 30/08/2020 (clc is not needed here)
  4541                              <1> 	;and	byte [esp+8], 0FEh ; clear carry bit of eflags register
  4542                              <1> RDT2:	
  4543 000056D0 5B                  <1> 	POP	eBX			; RESTORE REGISTERS
  4544                              <1> 	;POP	ES
  4545 000056D1 1F                  <1> 	POP	DS
  4546                              <1> 	; (*) CLC			; CLEAR CARRY
  4547                              <1> 	;RETf	2
  4548                              <1> 	; (*) 29/05/2016
  4549                              <1> 	; (*) retf 4
  4550                              <1> 	; 30/08/2020 (clc is not needed here)
  4551                              <1> 	;and	byte [esp+8], 0FEh ; clear carry bit of eflags register
  4552 000056D2 CF                  <1> 	iretd
  4553                              <1> 
  4554                              <1> RDT3:	; 28/08/2020
  4555                              <1> 	; (use the result of INT 13h, function 48h as disk size)
  4556                              <1> 	; eax = al = zero based hard disk number
  4557                              <1> 	; 29/08/2020
  4558                              <1> 	;add	al, 2 ; hd0 = physical disk drive 2
  4559 000056D3 C0E002              <1> 	shl	al, 2 ; * 4
  4560                              <1> RDT5:
  4561                              <1> 	;add	eax, drv.size
  4562 000056D6 05[266E0000]        <1> 	add	eax, drv.size+8 ; 29/08/2020
  4563 000056DB 668B10              <1> 	mov	dx, [eax]   ; low word of disk size
  4564 000056DE 668B4802            <1> 	mov	cx, [eax+2] ; high word of disk size
  4565                              <1> 	;sub	eax, eax
  4566 000056E2 EBE8                <1> 	jmp	short RDT4		
  4567                              <1> 
  4568                              <1> RDT_NOT_PRESENT:
  4569                              <1> 	; 30/08/2020
  4570 000056E4 C605[2B820100]AA    <1> 	mov	byte [DISK_STATUS1], NOT_RDY ; DRIVE NOT READY
  4571                              <1> 
  4572                              <1> 	;SUB	AX,AX			; DRIVE NOT PRESENT RETURN
  4573 000056EB 29C0                <1> 	sub	eax, eax ; 30/08/2020
  4574 000056ED 6689C1              <1> 	MOV	CX,AX			; ZERO BLOCK COUNT
  4575 000056F0 6689C2              <1> 	MOV	DX,AX
  4576                              <1> 	; 30/08/2020
  4577 000056F3 804C241001          <1> 	or	byte [esp+16], 1 ; set carry bit of eflags register
  4578                              <1> 		; cf = 1 -> ah = 0, drive not ready, disk type = 0
  4579 000056F8 EBD6                <1> 	JMP	short RDT2
  4580                              <1> 
  4581                              <1> ; 28/05/2016
  4582                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
  4583                              <1> 
  4584                              <1> ;----------------------------------------
  4585                              <1> ;	GET PARAMETERS	     (AH = 08H) :
  4586                              <1> ;----------------------------------------
  4587                              <1> 
  4588                              <1> GET_PARM_N:
  4589                              <1> 	; ebx = user's buffer address for parameters table
  4590                              <1> ;GET_PARM:				; GET DRIVE PARAMETERS
  4591 000056FA 1E                  <1> 	PUSH	DS			; SAVE REGISTERS
  4592 000056FB 06                  <1> 	PUSH	ES
  4593 000056FC 53                  <1> 	PUSH	eBX
  4594                              <1> 	;MOV	AX,ABS0 		; ESTABLISH ADDRESSING
  4595                              <1> 	;MOV	DS,AX
  4596                              <1> 	;TEST	DL,1			; CHECK FOR DRIVE 1
  4597                              <1> 	;JZ	short G0
  4598                              <1> 	;LES	BX,@HF1_TBL_VEC
  4599                              <1> 	;JMP	SHORT G1
  4600                              <1> ;G0:	LES	BX,@HF_TBL_VEC
  4601                              <1> ;G1:
  4602                              <1> 	;CALL	DDS			; ESTABLISH SEGMENT
  4603                              <1> 	; 22/12/2014
  4604                              <1> 	;push	cs
  4605                              <1> 	;pop	ds
  4606 000056FD 66BB1000            <1> 	mov	bx, KDATA
  4607 00005701 8EDB                <1> 	mov	ds, bx
  4608 00005703 8EC3                <1> 	mov	es, bx	; 27/05/2016
  4609                              <1> 	;
  4610 00005705 80EA80              <1> 	SUB	DL,80H
  4611                              <1> 	;CMP	DL,MAX_FILE		; TEST WITHIN RANGE
  4612                              <1> 	;JAE	short G4 ; 29/08/2020 - BugFix
  4613                              <1> 	; 30/08/2020
  4614 00005708 3A15[2C820100]      <1> 	cmp	dl, [HF_NUM] ; is hard disk index < hard disk count ?	
  4615 0000570E 736A                <1> 	jae	short G4     ; no, error ! drive not ready !	
  4616                              <1> 	;
  4617 00005710 31DB                <1> 	xor	ebx, ebx ; 21/02/2015
  4618                              <1> 	; 22/12/2014
  4619 00005712 88D3                <1> 	mov	bl, dl
  4620                              <1> 	;xor	bh, bh  
  4621 00005714 C0E302              <1> 	shl	bl, 2			; convert index to offset
  4622                              <1> 	;add	bx, HF_TBL_VEC
  4623 00005717 81C3[30820100]      <1> 	add	ebx, HF_TBL_VEC
  4624                              <1> 	;mov	ax, [bx+2]
  4625                              <1> 	;mov	es, ax			; dpt segment
  4626                              <1> 	;mov	bx, [bx]		; dpt offset
  4627 0000571D 8B1B                <1> 	mov	ebx, [ebx] ; 32 bit offset	
  4628                              <1> 
  4629 0000571F C605[2B820100]00    <1> 	MOV	byte [DISK_STATUS1],0
  4630                              <1>         ;MOV	AX,[ES:BX]		; MAX NUMBER OF CYLINDERS
  4631 00005726 668B03              <1> 	mov	ax, [ebx]
  4632                              <1> 	;;SUB	AX,2			; ADJUST FOR 0-N
  4633 00005729 6648                <1> 	dec	ax			; max. cylinder number
  4634 0000572B 88C5                <1> 	MOV	CH,AL
  4635 0000572D 66250003            <1> 	AND	AX,0300H		; HIGH TWO BITS OF CYLINDER
  4636 00005731 66D1E8              <1> 	SHR	AX,1
  4637 00005734 66D1E8              <1> 	SHR	AX,1
  4638                              <1> 	;OR	AL,[ES:BX+14]		; SECTORS
  4639 00005737 0A430E              <1> 	or	al, [ebx+14]
  4640 0000573A 88C1                <1> 	MOV	CL,AL
  4641                              <1> 	;MOV	DH,[ES:BX+2]		; HEADS
  4642 0000573C 8A7302              <1> 	mov	dh, [ebx+2]
  4643 0000573F FECE                <1> 	DEC	DH			; 0-N RANGE
  4644 00005741 8A15[2C820100]      <1> 	MOV	DL,[HF_NUM]		; DRIVE COUNT
  4645 00005747 6629C0              <1> 	SUB	AX,AX
  4646                              <1>         ;27/12/2014 
  4647                              <1> 	;mov	di, bx			; HDPT offset
  4648                              <1> 
  4649                              <1> 	; 29/08/2020
  4650 0000574A 833C2400            <1> 	cmp	dword [esp], 0
  4651 0000574E 7703                <1> 	ja	short G7 ; ebx > 0
  4652                              <1> 
  4653                              <1> 	; if EBX (user's buffer address) = 0, do not copy DPT
  4654 00005750 5B                  <1> 	pop	ebx
  4655 00005751 EB24                <1> 	jmp	short G5
  4656                              <1> G7:
  4657                              <1> 	; 27/05/2016
  4658                              <1> 	; return fixed disk parameters table to user
  4659                              <1> 	; in user's buffer, which is pointed by EBX
  4660                              <1> 	;
  4661 00005753 873C24              <1> 	xchg	edi, [esp]		; ebx (input)-> edi, edi -> [esp]
  4662 00005756 56                  <1> 	push	esi
  4663 00005757 89DE                <1> 	mov	esi, ebx		; hard disk parameter table (32 bytes)	
  4664 00005759 89FB                <1> 	mov	ebx, edi		; ebx = user's buffer address
  4665 0000575B 51                  <1> 	push	ecx
  4666 0000575C 50                  <1> 	push	eax
  4667 0000575D B920000000          <1> 	mov	ecx, 32 ; 32 bytes
  4668 00005762 E85DBB0000          <1> 	call	transfer_to_user_buffer ; trdosk6.s (16/05/2016)
  4669 00005767 58                  <1> 	pop	eax
  4670 00005768 59                  <1> 	pop	ecx
  4671 00005769 5E                  <1> 	pop	esi
  4672 0000576A 5F                  <1> 	pop	edi
  4673 0000576B 730A                <1> 	jnc	short G5
  4674                              <1> 	; 29/05/2016 (*)
  4675 0000576D B8FF000000          <1> 	mov	eax, 0FFh ; unknown error !
  4676                              <1> G6:
  4677 00005772 804C241001          <1> 	or	byte [esp+16], 1 ; set carry bit of eflags register
  4678                              <1> G5:
  4679                              <1> 	; 27/05/2016
  4680                              <1> 	;POP	eBX			; RESTORE REGISTERS
  4681 00005777 07                  <1> 	POP	ES
  4682 00005778 1F                  <1> 	POP	DS
  4683                              <1> 	;RETf	2
  4684                              <1> 	; (*) 29/05/2016
  4685                              <1> 	; (*) retf 4
  4686                              <1> 	; (*) or byte [esp+8], 1 ; set carry bit of eflags register
  4687 00005779 CF                  <1> 	iretd
  4688                              <1> G4:
  4689 0000577A C605[2B820100]07    <1> 	MOV     byte [DISK_STATUS1],INIT_FAIL ; OPERATION FAILED
  4690                              <1> 	;mov	ah, NOT_DRY ; 30/08/2020 - 'drive not ready' error code
  4691 00005781 B407                <1> 	MOV	AH,INIT_FAIL
  4692 00005783 28C0                <1> 	SUB	AL,AL
  4693                              <1> 	;SUB	DX,DX
  4694                              <1> 	; 30/08/2020
  4695 00005785 8A15[2C820100]      <1> 	mov	dl, [HF_NUM] ; disk count
  4696 0000578B 28F6                <1> 	sub	dh, dh
  4697 0000578D 6629C9              <1> 	SUB	CX,CX
  4698                              <1> 	; 29/05/2016 (*)
  4699                              <1> 	;STC				; SET ERROR FLAG
  4700                              <1> 	;JMP	short G5
  4701                              <1> 	; 29/08/2020 - BugFix
  4702 00005790 5B                  <1> 	pop	ebx
  4703 00005791 EBDF                <1> 	jmp	short G6
  4704                              <1> 
  4705                              <1> ;----------------------------------------
  4706                              <1> ;	INITIALIZE DRIVE     (AH = 09H) :
  4707                              <1> ;----------------------------------------
  4708                              <1> 	; 03/01/2015
  4709                              <1> 	; According to ATA-ATAPI specification v2.0 to v5.0
  4710                              <1> 	; logical sector per logical track
  4711                              <1> 	; and logical heads - 1 would be set but
  4712                              <1> 	; it is seen as it will be good
  4713                              <1> 	; if physical parameters will be set here
  4714                              <1> 	; because, number of heads <= 16.
  4715                              <1> 	; (logical heads usually more than 16)
  4716                              <1> 	; NOTE: ATA logical parameters (software C, H, S)
  4717                              <1> 	;	== INT 13h physical parameters
  4718                              <1> 
  4719                              <1> ;INIT_DRV:
  4720                              <1> ;	MOV	byte [CMD_BLOCK+6],SET_PARM_CMD
  4721                              <1> ;	CALL	GET_VEC 		; ES:BX -> PARAMETER BLOCK
  4722                              <1> ;	MOV	AL,[ES:BX+2]		; GET NUMBER OF HEADS
  4723                              <1> ;	DEC	AL			; CONVERT TO 0-INDEX
  4724                              <1> ;	MOV	AH,[CMD_BLOCK+5] 	; GET SDH REGISTER
  4725                              <1> ;	AND	AH,0F0H 		; CHANGE HEAD NUMBER
  4726                              <1> ;	OR	AH,AL			; TO MAX HEAD
  4727                              <1> ;	MOV	[CMD_BLOCK+5],AH
  4728                              <1> ;	MOV	AL,[ES:BX+14]		; MAX SECTOR NUMBER
  4729                              <1> ;	MOV	[CMD_BLOCK+1],AL
  4730                              <1> ;	SUB	AX,AX
  4731                              <1> ;	MOV	[CMD_BLOCK+3],AL 	; ZERO FLAGS
  4732                              <1> ;	CALL	COMMAND 		; TELL CONTROLLER
  4733                              <1> ;	JNZ	short INIT_EXIT		; CONTROLLER BUSY ERROR
  4734                              <1> ;	CALL	NOT_BUSY		; WAIT FOR IT TO BE DONE
  4735                              <1> ;	JNZ	short INIT_EXIT		; TIME OUT
  4736                              <1> ;	CALL	CHECK_STATUS
  4737                              <1> ;INIT_EXIT:
  4738                              <1> ;	RETn
  4739                              <1> 
  4740                              <1> ; 04/01/2015
  4741                              <1> ; 02/01/2015 - Derived from from AWARD BIOS 1999
  4742                              <1> ;				 AHDSK.ASM - INIT_DRIVE
  4743                              <1> INIT_DRV:
  4744                              <1> 	;xor	ah,ah
  4745 00005793 31C0                <1> 	xor	eax, eax ; 21/02/2015
  4746 00005795 B00B                <1> 	mov	al,11 ; Physical heads from translated HDPT
  4747 00005797 3825[40820100]      <1>         cmp     [LBAMode], ah   ; 0
  4748 0000579D 7702                <1> 	ja	short idrv0
  4749 0000579F B002                <1> 	mov	al,2  ; Physical heads from standard HDPT
  4750                              <1> idrv0:
  4751                              <1> 	; DL = drive number (0 based)
  4752 000057A1 E8C6030000          <1> 	call	GET_VEC
  4753                              <1> 	;push	bx
  4754 000057A6 53                  <1> 	push	ebx ; 21/02/2015
  4755                              <1> 	;add	bx,ax
  4756 000057A7 01C3                <1> 	add	ebx, eax
  4757                              <1> 	;; 05/01/2015
  4758 000057A9 8A25[E46D0000]      <1> 	mov	ah, [hf_m_s] ; drive number (0= master, 1= slave)
  4759                              <1> 	;;and 	ah,1 
  4760 000057AF C0E404              <1> 	shl	ah,4
  4761 000057B2 80CCA0              <1> 	or	ah,0A0h  ; Drive/Head register - 10100000b (A0h)	
  4762                              <1> 	;mov	al,[es:bx]
  4763 000057B5 8A03                <1> 	mov	al, [ebx] ; 21/02/2015
  4764 000057B7 FEC8                <1> 	dec	al	 ; last head number 
  4765                              <1> 	;and	al,0Fh
  4766 000057B9 08E0                <1> 	or	al,ah	 ; lower 4 bits for head number
  4767                              <1> 	;
  4768 000057BB C645FE91            <1> 	mov	byte [CMD_BLOCK+6],SET_PARM_CMD
  4769 000057BF 8845FD              <1> 	mov	[CMD_BLOCK+5],al
  4770                              <1> 	;pop	bx
  4771 000057C2 5B                  <1> 	pop	ebx
  4772 000057C3 29C0                <1> 	sub	eax, eax ; 21/02/2015
  4773 000057C5 B004                <1> 	mov	al,4 ; Physical sec per track from translated HDPT
  4774 000057C7 803D[40820100]00    <1> 	cmp	byte [LBAMode], 0
  4775 000057CE 7702                <1> 	ja	short idrv1
  4776 000057D0 B00E                <1> 	mov	al,14 ; Physical sec per track from standard HDPT
  4777                              <1> idrv1:
  4778                              <1> 	;xor	ah,ah
  4779                              <1> 	;add	bx,ax
  4780 000057D2 01C3                <1> 	add	ebx, eax ; 21/02/2015
  4781                              <1> 	;mov	al,[es:bx]
  4782                              <1> 			; sector number
  4783 000057D4 8A03                <1> 	mov	al, [ebx]
  4784 000057D6 8845F9              <1> 	mov	[CMD_BLOCK+1],al
  4785 000057D9 28C0                <1> 	sub	al,al
  4786 000057DB 8845FB              <1> 	mov	[CMD_BLOCK+3],al  ; ZERO FLAGS
  4787 000057DE E8CA010000          <1> 	call	COMMAND 	  ; TELL CONTROLLER
  4788 000057E3 750C                <1> 	jnz	short INIT_EXIT	  ; CONTROLLER BUSY ERROR
  4789 000057E5 E878020000          <1> 	call	NOT_BUSY	  ; WAIT FOR IT TO BE DONE
  4790 000057EA 7505                <1> 	jnz	short INIT_EXIT	  ; TIME OUT
  4791 000057EC E8C9020000          <1> 	call	CHECK_STATUS
  4792                              <1> INIT_EXIT:
  4793 000057F1 C3                  <1> 	RETn
  4794                              <1> 
  4795                              <1> ;----------------------------------------
  4796                              <1> ;	READ LONG	     (AH = 0AH) :
  4797                              <1> ;----------------------------------------
  4798                              <1> 
  4799                              <1> RD_LONG:
  4800                              <1> 	;MOV	@CMD_BLOCK+6,READ_CMD OR ECC_MODE
  4801 000057F2 C645FE22            <1>         mov     byte [CMD_BLOCK+6],READ_CMD + ECC_MODE 
  4802 000057F6 E9E0000000          <1>         JMP     COMMANDI
  4803                              <1> 
  4804                              <1> ;----------------------------------------
  4805                              <1> ;	WRITE LONG	     (AH = 0BH) :
  4806                              <1> ;----------------------------------------
  4807                              <1> 
  4808                              <1> WR_LONG:
  4809                              <1> 	;MOV	@CMD_BLOCK+6,WRITE_CMD OR ECC_MODE
  4810 000057FB C645FE32            <1>         MOV     byte [CMD_BLOCK+6],WRITE_CMD + ECC_MODE
  4811 000057FF E932010000          <1>         JMP     COMMANDO
  4812                              <1> 
  4813                              <1> ;----------------------------------------
  4814                              <1> ;	SEEK		     (AH = 0CH) :
  4815                              <1> ;----------------------------------------
  4816                              <1> 
  4817                              <1> DISK_SEEK:
  4818 00005804 C645FE70            <1>         MOV     byte [CMD_BLOCK+6],SEEK_CMD
  4819 00005808 E8A0010000          <1> 	CALL	COMMAND
  4820 0000580D 751C                <1> 	JNZ	short DS_EXIT 		; CONTROLLER BUSY ERROR
  4821 0000580F E812020000          <1> 	CALL	_WAIT
  4822 00005814 7515                <1>         JNZ     DS_EXIT                 ; TIME OUT ON SEEK
  4823 00005816 E89F020000          <1> 	CALL	CHECK_STATUS
  4824 0000581B 803D[2B820100]40    <1>         CMP     byte [DISK_STATUS1],BAD_SEEK
  4825 00005822 7507                <1> 	JNE	short DS_EXIT
  4826 00005824 C605[2B820100]00    <1>         MOV     byte [DISK_STATUS1],0
  4827                              <1> DS_EXIT:
  4828 0000582B C3                  <1> 	RETn
  4829                              <1> 
  4830                              <1> ;----------------------------------------
  4831                              <1> ;	TEST DISK READY      (AH = 10H) :
  4832                              <1> ;----------------------------------------
  4833                              <1> 
  4834                              <1> TST_RDY:				; WAIT FOR CONTROLLER
  4835 0000582C E831020000          <1> 	CALL	NOT_BUSY
  4836 00005831 751C                <1> 	JNZ	short TR_EX
  4837 00005833 8A45FD              <1> 	MOV	AL,[CMD_BLOCK+5] 	; SELECT DRIVE
  4838 00005836 668B15[E06D0000]    <1> 	MOV	DX,[HF_PORT]
  4839 0000583D 80C206              <1> 	add	dl,6
  4840 00005840 EE                  <1> 	OUT	DX,AL
  4841 00005841 E88C020000          <1> 	CALL	CHECK_ST		; CHECK STATUS ONLY
  4842 00005846 7507                <1> 	JNZ	short TR_EX
  4843 00005848 C605[2B820100]00    <1> 	MOV	byte [DISK_STATUS1],0 	; WIPE OUT DATA CORRECTED ERROR
  4844                              <1> TR_EX:	
  4845 0000584F C3                  <1> 	RETn
  4846                              <1> 
  4847                              <1> ;----------------------------------------
  4848                              <1> ;	RECALIBRATE	     (AH = 11H) :
  4849                              <1> ;----------------------------------------
  4850                              <1> 
  4851                              <1> HDISK_RECAL:
  4852 00005850 C645FE10            <1>         MOV     byte [CMD_BLOCK+6],RECAL_CMD ; 10h, 16
  4853 00005854 E854010000          <1> 	CALL	COMMAND 		; START THE OPERATION
  4854 00005859 7523                <1> 	JNZ	short RECAL_EXIT	; ERROR
  4855 0000585B E8C6010000          <1> 	CALL	_WAIT			; WAIT FOR COMPLETION
  4856 00005860 7407                <1> 	JZ	short RECAL_X 		; TIME OUT ONE OK ?
  4857 00005862 E8BF010000          <1> 	CALL	_WAIT			; WAIT FOR COMPLETION LONGER
  4858 00005867 7515                <1> 	JNZ	short RECAL_EXIT	; TIME OUT TWO TIMES IS ERROR
  4859                              <1> RECAL_X:
  4860 00005869 E84C020000          <1> 	CALL	CHECK_STATUS
  4861 0000586E 803D[2B820100]40    <1> 	CMP	byte [DISK_STATUS1],BAD_SEEK ; SEEK NOT COMPLETE
  4862 00005875 7507                <1> 	JNE	short RECAL_EXIT	; IS OK
  4863 00005877 C605[2B820100]00    <1> 	MOV	byte [DISK_STATUS1],0
  4864                              <1> RECAL_EXIT:
  4865 0000587E 803D[2B820100]00    <1>         CMP     byte [DISK_STATUS1],0
  4866 00005885 C3                  <1> 	RETn
  4867                              <1> 
  4868                              <1> ;----------------------------------------
  4869                              <1> ;      CONTROLLER DIAGNOSTIC (AH = 14H) :
  4870                              <1> ;----------------------------------------
  4871                              <1> 
  4872                              <1> CTLR_DIAGNOSTIC:
  4873 00005886 FA                  <1>         CLI                             ; DISABLE INTERRUPTS WHILE CHANGING MASK
  4874 00005887 E4A1                <1> 	IN	AL,INTB01		; TURN ON SECOND INTERRUPT CHIP
  4875                              <1> 	;AND	AL,0BFH
  4876 00005889 243F                <1> 	and	al, 3Fh			; enable IRQ 14 & IRQ 15
  4877                              <1> 	;JMP	$+2
  4878                              <1> 	IODELAY
  4878 0000588B EB00                <2>  jmp short $+2
  4878 0000588D EB00                <2>  jmp short $+2
  4879 0000588F E6A1                <1> 	OUT	INTB01,AL
  4880                              <1> 	IODELAY
  4880 00005891 EB00                <2>  jmp short $+2
  4880 00005893 EB00                <2>  jmp short $+2
  4881 00005895 E421                <1> 	IN	AL,INTA01		; LET INTERRUPTS PASS THRU TO
  4882 00005897 24FB                <1> 	AND	AL,0FBH 		;  SECOND CHIP
  4883                              <1> 	;JMP	$+2
  4884                              <1> 	IODELAY
  4884 00005899 EB00                <2>  jmp short $+2
  4884 0000589B EB00                <2>  jmp short $+2
  4885 0000589D E621                <1> 	OUT	INTA01,AL
  4886 0000589F FB                  <1> 	STI
  4887 000058A0 E8BD010000          <1> 	CALL	NOT_BUSY		; WAIT FOR CARD
  4888 000058A5 752B                <1> 	JNZ	short CD_ERR		; BAD CARD
  4889                              <1> 	;MOV	DX, HF_PORT+7
  4890 000058A7 668B15[E06D0000]    <1> 	mov	dx, [HF_PORT]
  4891 000058AE 80C207              <1> 	add	dl, 7
  4892 000058B1 B090                <1> 	MOV	AL,DIAG_CMD		; START DIAGNOSE
  4893 000058B3 EE                  <1> 	OUT	DX,AL
  4894 000058B4 E8A9010000          <1> 	CALL	NOT_BUSY		; WAIT FOR IT TO COMPLETE
  4895 000058B9 B480                <1> 	MOV	AH,TIME_OUT
  4896 000058BB 7517                <1> 	JNZ	short CD_EXIT 		; TIME OUT ON DIAGNOSTIC
  4897                              <1> 	;MOV	DX,HF_PORT+1		; GET ERROR REGISTER
  4898 000058BD 668B15[E06D0000]    <1> 	mov	dx, [HF_PORT]
  4899 000058C4 FEC2                <1> 	inc	dl
  4900 000058C6 EC                  <1> 	IN	AL,DX
  4901 000058C7 A2[22820100]        <1> 	MOV	[HF_ERROR],AL		; SAVE IT
  4902 000058CC B400                <1> 	MOV	AH,0
  4903 000058CE 3C01                <1> 	CMP	AL,1			; CHECK FOR ALL OK
  4904 000058D0 7402                <1> 	JE	SHORT CD_EXIT
  4905 000058D2 B420                <1> CD_ERR: MOV	AH,BAD_CNTLR
  4906                              <1> CD_EXIT:
  4907 000058D4 8825[2B820100]      <1> 	MOV	[DISK_STATUS1],AH
  4908 000058DA C3                  <1> 	RETn
  4909                              <1> 
  4910                              <1> ;----------------------------------------
  4911                              <1> ; COMMANDI				:
  4912                              <1> ;	REPEATEDLY INPUTS DATA TILL	:
  4913                              <1> ;	NSECTOR RETURNS ZERO		:
  4914                              <1> ;----------------------------------------
  4915                              <1> COMMANDI:
  4916 000058DB E862020000          <1> 	CALL	CHECK_DMA		; CHECK 64K BOUNDARY ERROR
  4917 000058E0 7253                <1> 	JC	short CMD_ABORT
  4918                              <1> 	;MOV	DI,BX
  4919 000058E2 89DF                <1> 	mov	edi, ebx ; 21/02/2015
  4920 000058E4 E8C4000000          <1> 	CALL	COMMAND 		; OUTPUT COMMAND
  4921 000058E9 754A                <1> 	JNZ	short CMD_ABORT
  4922                              <1> CMD_I1:
  4923 000058EB E836010000          <1> 	CALL	_WAIT			; WAIT FOR DATA REQUEST INTERRUPT
  4924 000058F0 7543                <1> 	JNZ	short TM_OUT		; TIME OUT
  4925                              <1> cmd_i1x: ; 18/02/2016
  4926                              <1> 	;MOV	CX,256			; SECTOR SIZE IN WORDS
  4927 000058F2 B900010000          <1> 	mov	ecx, 256 ; 21/02/2015	
  4928                              <1> 	;MOV	DX,HF_PORT
  4929 000058F7 668B15[E06D0000]    <1> 	mov	dx,[HF_PORT]
  4930 000058FE FA                  <1> 	CLI
  4931 000058FF FC                  <1> 	CLD
  4932 00005900 F3666D              <1> 	REP	INSW			; GET THE SECTOR
  4933 00005903 FB                  <1> 	STI
  4934 00005904 F645FE02            <1> 	TEST	byte [CMD_BLOCK+6],ECC_MODE ; CHECK FOR NORMAL INPUT
  4935 00005908 7419                <1> 	JZ	short CMD_I3
  4936 0000590A E880010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4937 0000590F 7224                <1> 	JC	short TM_OUT
  4938                              <1> 	;MOV	DX,HF_PORT
  4939 00005911 668B15[E06D0000]    <1> 	mov	dx,[HF_PORT]
  4940                              <1> 	;MOV	CX,4			; GET ECC BYTES
  4941 00005918 B904000000          <1> 	mov 	ecx, 4 ; mov cx, 4 
  4942 0000591D EC                  <1> CMD_I2: IN	AL,DX
  4943                              <1> 	;MOV	[ES:DI],AL		; GO SLOW FOR BOARD
  4944 0000591E 8807                <1> 	mov 	[edi], al ; 21/02/2015
  4945 00005920 47                  <1> 	INC	eDI
  4946 00005921 E2FA                <1> 	LOOP	CMD_I2
  4947                              <1> CMD_I3: 
  4948                              <1> 	; wait for 400 ns
  4949 00005923 80C207              <1> 	add 	dl, 7
  4950 00005926 EC                  <1> 	in	al, dx
  4951 00005927 EC                  <1> 	in	al, dx
  4952 00005928 EC                  <1> 	in	al, dx
  4953                              <1> 	;
  4954 00005929 E88C010000          <1> 	CALL	CHECK_STATUS
  4955 0000592E 7505                <1> 	JNZ	short CMD_ABORT		; ERROR RETURNED
  4956 00005930 FE4DF9              <1> 	DEC	byte [CMD_BLOCK+1]	; CHECK FOR MORE
  4957                              <1> 	;JNZ	SHORT CMD_I1
  4958 00005933 75BD                <1> 	jnz	short cmd_i1x ; 18/02/2016
  4959                              <1> CMD_ABORT:
  4960 00005935 C3                  <1> TM_OUT: RETn
  4961                              <1> 
  4962                              <1> ;----------------------------------------
  4963                              <1> ; COMMANDO				:
  4964                              <1> ;	REPEATEDLY OUTPUTS DATA TILL	:
  4965                              <1> ;	NSECTOR RETURNS ZERO		:
  4966                              <1> ;----------------------------------------
  4967                              <1> COMMANDO:
  4968 00005936 E807020000          <1> 	CALL	CHECK_DMA		; CHECK 64K BOUNDARY ERROR
  4969 0000593B 72F8                <1> 	JC	short CMD_ABORT
  4970 0000593D 89DE                <1> CMD_OF: MOV	eSI,eBX ; 21/02/2015
  4971 0000593F E869000000          <1> 	CALL	COMMAND 		; OUTPUT COMMAND
  4972 00005944 75EF                <1> 	JNZ	short CMD_ABORT
  4973 00005946 E844010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4974 0000594B 72E8                <1> 	JC	short TM_OUT			; TOO LONG
  4975                              <1> CMD_O1: ;PUSH	DS
  4976                              <1> 	;PUSH	ES			; MOVE ES TO DS
  4977                              <1> 	;POP	DS
  4978                              <1> 	;MOV	CX,256			; PUT THE DATA OUT TO THE CARD
  4979                              <1> 	;MOV	DX,HF_PORT
  4980                              <1> 	; 01/02/2015
  4981 0000594D 668B15[E06D0000]    <1> 	mov	dx, [HF_PORT]
  4982                              <1> 	;push	es
  4983                              <1> 	;pop	ds
  4984                              <1> 	;mov	cx, 256
  4985 00005954 B900010000          <1> 	mov	ecx, 256 ; 21/02/2015
  4986 00005959 FA                  <1> 	CLI
  4987 0000595A FC                  <1> 	CLD
  4988 0000595B F3666F              <1> 	REP	OUTSW
  4989 0000595E FB                  <1> 	STI
  4990                              <1> 	;POP	DS			; RESTORE DS
  4991 0000595F F645FE02            <1> 	TEST	byte [CMD_BLOCK+6],ECC_MODE ; CHECK FOR NORMAL OUTPUT
  4992 00005963 7419                <1> 	JZ	short CMD_O3
  4993 00005965 E825010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4994 0000596A 72C9                <1> 	JC	short TM_OUT
  4995                              <1> 	;MOV	DX,HF_PORT
  4996 0000596C 668B15[E06D0000]    <1> 	mov	dx, [HF_PORT]
  4997                              <1> 	;MOV	CX,4			; OUTPUT THE ECC BYTES
  4998 00005973 B904000000          <1> 	mov	ecx, 4  ; mov cx, 4
  4999                              <1> CMD_O2: ;MOV	AL,[ES:SI]
  5000 00005978 8A06                <1> 	mov	al, [esi]
  5001 0000597A EE                  <1> 	OUT	DX,AL
  5002 0000597B 46                  <1> 	INC	eSI
  5003 0000597C E2FA                <1> 	LOOP	CMD_O2
  5004                              <1> CMD_O3:
  5005 0000597E E8A3000000          <1> 	CALL	_WAIT			; WAIT FOR SECTOR COMPLETE INTERRUPT
  5006 00005983 75B0                <1> 	JNZ	short TM_OUT		; ERROR RETURNED
  5007 00005985 E830010000          <1> 	CALL	CHECK_STATUS
  5008 0000598A 75A9                <1> 	JNZ	short CMD_ABORT
  5009 0000598C F605[21820100]08    <1> 	TEST	byte [HF_STATUS],ST_DRQ	; CHECK FOR MORE
  5010 00005993 75B8                <1> 	JNZ	SHORT CMD_O1
  5011                              <1> 	;MOV	DX,HF_PORT+2		; CHECK RESIDUAL SECTOR COUNT
  5012 00005995 668B15[E06D0000]    <1> 	mov	dx, [HF_PORT]
  5013                              <1> 	;add	dl, 2
  5014 0000599C FEC2                <1> 	inc	dl
  5015 0000599E FEC2                <1> 	inc	dl
  5016 000059A0 EC                  <1> 	IN	AL,DX			;
  5017 000059A1 A8FF                <1> 	TEST	AL,0FFH 		;
  5018 000059A3 7407                <1> 	JZ	short CMD_O4			; COUNT = 0  OK
  5019 000059A5 C605[2B820100]BB    <1> 	MOV	byte [DISK_STATUS1],UNDEF_ERR 
  5020                              <1> 					; OPERATION ABORTED - PARTIAL TRANSFER
  5021                              <1> CMD_O4:
  5022 000059AC C3                  <1> 	RETn
  5023                              <1> 
  5024                              <1> ;--------------------------------------------------------
  5025                              <1> ; COMMAND						:
  5026                              <1> ;	THIS ROUTINE OUTPUTS THE COMMAND BLOCK		:
  5027                              <1> ; OUTPUT						:
  5028                              <1> ;	BL = STATUS					:
  5029                              <1> ;	BH = ERROR REGISTER				:
  5030                              <1> ;--------------------------------------------------------
  5031                              <1> 
  5032                              <1> COMMAND:
  5033 000059AD 53                  <1> 	PUSH	eBX			; WAIT FOR SEEK COMPLETE AND READY
  5034                              <1> 	;;MOV	CX,DELAY_2		; SET INITIAL DELAY BEFORE TEST
  5035                              <1> COMMAND1:
  5036                              <1> 	;;PUSH	CX			; SAVE LOOP COUNT
  5037 000059AE E879FEFFFF          <1> 	CALL	TST_RDY 		; CHECK DRIVE READY
  5038                              <1> 	;;POP	CX
  5039 000059B3 7419                <1> 	JZ	short COMMAND2		; DRIVE IS READY
  5040 000059B5 803D[2B820100]80    <1>         CMP     byte [DISK_STATUS1],TIME_OUT ; TST_RDY TIMED OUT--GIVE UP
  5041                              <1> 	;JZ	short CMD_TIMEOUT
  5042                              <1> 	;;LOOP	COMMAND1		; KEEP TRYING FOR A WHILE
  5043                              <1> 	;JMP	SHORT COMMAND4		; ITS NOT GOING TO GET READY
  5044 000059BC 7507                <1> 	jne	short COMMAND4
  5045                              <1> CMD_TIMEOUT:
  5046 000059BE C605[2B820100]20    <1> 	MOV	byte [DISK_STATUS1],BAD_CNTLR
  5047                              <1> COMMAND4:
  5048 000059C5 5B                  <1> 	POP	eBX
  5049 000059C6 803D[2B820100]00    <1>         CMP     byte [DISK_STATUS1],0   ; SET CONDITION CODE FOR CALLER
  5050 000059CD C3                  <1> 	RETn
  5051                              <1> COMMAND2:
  5052 000059CE 5B                  <1> 	POP	eBX
  5053 000059CF 57                  <1> 	PUSH	eDI
  5054 000059D0 C605[23820100]00    <1> 	MOV	byte [HF_INT_FLAG],0	; RESET INTERRUPT FLAG
  5055 000059D7 FA                  <1> 	CLI				; INHIBIT INTERRUPTS WHILE CHANGING MASK
  5056 000059D8 E4A1                <1> 	IN	AL,INTB01		; TURN ON SECOND INTERRUPT CHIP
  5057                              <1> 	;AND	AL,0BFH
  5058 000059DA 243F                <1> 	and	al, 3Fh			; Enable IRQ 14 & 15
  5059                              <1> 	;JMP	$+2
  5060                              <1> 	IODELAY
  5060 000059DC EB00                <2>  jmp short $+2
  5060 000059DE EB00                <2>  jmp short $+2
  5061 000059E0 E6A1                <1> 	OUT	INTB01,AL
  5062 000059E2 E421                <1> 	IN	AL,INTA01		; LET INTERRUPTS PASS THRU TO
  5063 000059E4 24FB                <1> 	AND	AL,0FBH 		;  SECOND CHIP
  5064                              <1> 	;JMP	$+2
  5065                              <1> 	IODELAY
  5065 000059E6 EB00                <2>  jmp short $+2
  5065 000059E8 EB00                <2>  jmp short $+2
  5066 000059EA E621                <1> 	OUT	INTA01,AL
  5067 000059EC FB                  <1> 	STI
  5068 000059ED 31FF                <1> 	XOR	eDI,eDI			; INDEX THE COMMAND TABLE
  5069                              <1> 	;MOV	DX,HF_PORT+1		; DISK ADDRESS
  5070 000059EF 668B15[E06D0000]    <1> 	mov	dx, [HF_PORT]
  5071 000059F6 FEC2                <1> 	inc	dl
  5072 000059F8 F605[2D820100]C0    <1> 	TEST	byte [CONTROL_BYTE],0C0H ; CHECK FOR RETRY SUPPRESSION
  5073 000059FF 7411                <1> 	JZ	short COMMAND3
  5074 00005A01 8A45FE              <1> 	MOV	AL, [CMD_BLOCK+6] 	; YES-GET OPERATION CODE
  5075 00005A04 24F0                <1> 	AND	AL,0F0H 		; GET RID OF MODIFIERS
  5076 00005A06 3C20                <1> 	CMP	AL,20H			; 20H-40H IS READ, WRITE, VERIFY
  5077 00005A08 7208                <1> 	JB	short COMMAND3
  5078 00005A0A 3C40                <1> 	CMP	AL,40H
  5079 00005A0C 7704                <1> 	JA	short COMMAND3
  5080 00005A0E 804DFE01            <1> 	OR	byte [CMD_BLOCK+6],NO_RETRIES 
  5081                              <1> 					; VALID OPERATION FOR RETRY SUPPRESS
  5082                              <1> COMMAND3:
  5083 00005A12 8A443DF8            <1> 	MOV	AL,[CMD_BLOCK+eDI]	; GET THE COMMAND STRING BYTE
  5084 00005A16 EE                  <1> 	OUT	DX,AL			; GIVE IT TO CONTROLLER
  5085                              <1> 	IODELAY
  5085 00005A17 EB00                <2>  jmp short $+2
  5085 00005A19 EB00                <2>  jmp short $+2
  5086 00005A1B 47                  <1> 	INC	eDI			; NEXT BYTE IN COMMAND BLOCK
  5087 00005A1C 6642                <1> 	INC	DX			; NEXT DISK ADAPTER REGISTER
  5088 00005A1E 6683FF07            <1> 	cmp	di, 7	; 1/1/2015	; ALL DONE?
  5089 00005A22 75EE                <1> 	JNZ	short COMMAND3		; NO--GO DO NEXT ONE
  5090 00005A24 5F                  <1> 	POP	eDI
  5091 00005A25 C3                  <1> 	RETn				; ZERO FLAG IS SET
  5092                              <1> 
  5093                              <1> ;CMD_TIMEOUT:
  5094                              <1> ;	MOV	byte [DISK_STATUS1],BAD_CNTLR
  5095                              <1> ;COMMAND4:
  5096                              <1> ;	POP	BX
  5097                              <1> ;	CMP	[DISK_STATUS1],0 	; SET CONDITION CODE FOR CALLER
  5098                              <1> ;	RETn
  5099                              <1> 
  5100                              <1> ;----------------------------------------
  5101                              <1> ;	WAIT FOR INTERRUPT		:
  5102                              <1> ;----------------------------------------
  5103                              <1> ;WAIT:
  5104                              <1> _WAIT:
  5105 00005A26 FB                  <1> 	STI				; MAKE SURE INTERRUPTS ARE ON
  5106                              <1> 	;SUB	CX,CX			; SET INITIAL DELAY BEFORE TEST
  5107                              <1> 	;CLC
  5108                              <1> 	;MOV	AX,9000H		; DEVICE WAIT INTERRUPT
  5109                              <1> 	;INT	15H
  5110                              <1> 	;JC	WT2			; DEVICE TIMED OUT
  5111                              <1> 	;MOV	BL,DELAY_1		; SET DELAY COUNT
  5112                              <1> 
  5113                              <1> 	;mov	bl, WAIT_HDU_INT_HI
  5114                              <1> 	;; 21/02/2015
  5115                              <1> 	;;mov	bl, WAIT_HDU_INT_HI + 1
  5116                              <1> 	;;mov	cx, WAIT_HDU_INT_LO
  5117 00005A27 B915160500          <1> 	mov	ecx, WAIT_HDU_INT_LH
  5118                              <1> 					; (AWARD BIOS -> WAIT_FOR_MEM)
  5119                              <1> ;-----	WAIT LOOP
  5120                              <1> 
  5121                              <1> WT1:	
  5122                              <1> 	;TEST	byte [HF_INT_FLAG],80H	; TEST FOR INTERRUPT
  5123 00005A2C F605[23820100]C0    <1> 	test 	byte [HF_INT_FLAG],0C0h
  5124                              <1> 	;LOOPZ	WT1
  5125 00005A33 7517                <1> 	JNZ	short WT3		; INTERRUPT--LETS GO
  5126                              <1> 	;DEC	BL
  5127                              <1> 	;JNZ	short WT1		; KEEP TRYING FOR A WHILE
  5128                              <1> 
  5129                              <1> WT1_hi:
  5130 00005A35 E461                <1> 	in	al, SYS1 ; 61h (PORT_B)	; wait for lo to hi
  5131 00005A37 A810                <1> 	test	al, 10h			; transition on memory
  5132 00005A39 75FA                <1> 	jnz	short WT1_hi		; refresh.
  5133                              <1> WT1_lo:
  5134 00005A3B E461                <1> 	in	al, SYS1 		; 061h (PORT_B)	
  5135 00005A3D A810                <1> 	test	al, 10h			
  5136 00005A3F 74FA                <1> 	jz	short WT1_lo
  5137 00005A41 E2E9                <1> 	loop	WT1
  5138                              <1> 	;;or	bl, bl
  5139                              <1> 	;;jz	short WT2	
  5140                              <1> 	;;dec	bl
  5141                              <1> 	;;jmp	short WT1
  5142                              <1> 	;dec	bl
  5143                              <1> 	;jnz	short WT1	
  5144                              <1> 
  5145 00005A43 C605[2B820100]80    <1> WT2:	MOV	byte [DISK_STATUS1],TIME_OUT ; REPORT TIME OUT ERROR
  5146 00005A4A EB0E                <1> 	JMP	SHORT WT4
  5147 00005A4C C605[2B820100]00    <1> WT3:	MOV	byte [DISK_STATUS1],0
  5148 00005A53 C605[23820100]00    <1> 	MOV	byte [HF_INT_FLAG],0
  5149 00005A5A 803D[2B820100]00    <1> WT4:	CMP	byte [DISK_STATUS1],0 	; SET CONDITION CODE FOR CALLER
  5150 00005A61 C3                  <1> 	RETn
  5151                              <1> 
  5152                              <1> ;----------------------------------------
  5153                              <1> ;	WAIT FOR CONTROLLER NOT BUSY	:
  5154                              <1> ;----------------------------------------
  5155                              <1> NOT_BUSY:
  5156 00005A62 FB                  <1> 	STI				; MAKE SURE INTERRUPTS ARE ON
  5157                              <1> 	;PUSH	eBX
  5158                              <1> 	;SUB	CX,CX			; SET INITIAL DELAY BEFORE TEST
  5159 00005A63 668B15[E06D0000]    <1> 	mov	DX, [HF_PORT]
  5160 00005A6A 80C207              <1> 	add	dl, 7			; Status port (HF_PORT+7)
  5161                              <1> 	;MOV	BL,DELAY_1
  5162                              <1> 					; wait for 10 seconds
  5163                              <1> 	;mov 	cx, WAIT_HDU_INT_LO	; 1615h
  5164                              <1> 	;;mov 	bl, WAIT_HDU_INT_HI	;   05h
  5165                              <1> 	;mov	bl, WAIT_HDU_INT_HI + 1
  5166 00005A6D B915160500          <1> 	mov	ecx, WAIT_HDU_INT_LH  ; 21/02/2015
  5167                              <1> 	;
  5168                              <1> ;;      mov     byte [wait_count], 0    ; Reset wait counter
  5169                              <1> NB1:	
  5170 00005A72 EC                  <1> 	IN	AL,DX			; CHECK STATUS
  5171                              <1> 	;TEST	AL,ST_BUSY
  5172 00005A73 2480                <1> 	and	al, ST_BUSY
  5173                              <1> 	;LOOPNZ	NB1
  5174 00005A75 7410                <1> 	JZ	short NB2		; NOT BUSY--LETS GO
  5175                              <1> 	;DEC	BL			
  5176                              <1> 	;JNZ	short NB1		; KEEP TRYING FOR A WHILE
  5177                              <1> 
  5178 00005A77 E461                <1> NB1_hi: IN	AL,SYS1			; wait for hi to lo
  5179 00005A79 A810                <1> 	TEST	AL,010H			; transition on memory
  5180 00005A7B 75FA                <1> 	JNZ	SHORT NB1_hi		; refresh.
  5181 00005A7D E461                <1> NB1_lo: IN	AL,SYS1
  5182 00005A7F A810                <1> 	TEST	AL,010H
  5183 00005A81 74FA                <1> 	JZ	short NB1_lo
  5184 00005A83 E2ED                <1> 	LOOP	NB1
  5185                              <1> 	;dec	bl
  5186                              <1> 	;jnz	short NB1
  5187                              <1> 	;
  5188                              <1> ;;      cmp     byte [wait_count], 182  ; 10 seconds (182 timer ticks)
  5189                              <1> ;;	jb	short NB1
  5190                              <1> 	;
  5191                              <1> 	;MOV	[DISK_STATUS1],TIME_OUT	; REPORT TIME OUT ERROR
  5192                              <1> 	;JMP	SHORT NB3
  5193 00005A85 B080                <1> 	mov	al, TIME_OUT
  5194                              <1> NB2:	
  5195                              <1> 	;MOV	byte [DISK_STATUS1],0
  5196                              <1> ;NB3:	
  5197                              <1> 	;POP	eBX
  5198 00005A87 A2[2B820100]        <1> 	mov	[DISK_STATUS1], al	;;; will be set after return
  5199                              <1> 	;CMP	byte [DISK_STATUS1],0 	; SET CONDITION CODE FOR CALLER
  5200 00005A8C 08C0                <1> 	or	al, al			; (zf = 0 --> timeout)
  5201 00005A8E C3                  <1> 	RETn
  5202                              <1> 
  5203                              <1> ;----------------------------------------
  5204                              <1> ;	WAIT FOR DATA REQUEST		:
  5205                              <1> ;----------------------------------------
  5206                              <1> WAIT_DRQ:
  5207                              <1> 	;MOV	CX,DELAY_3
  5208                              <1> 	;MOV	DX,HF_PORT+7
  5209 00005A8F 668B15[E06D0000]    <1> 	mov	dx, [HF_PORT]
  5210 00005A96 80C207              <1> 	add	dl, 7
  5211                              <1> 	;;MOV	bl, WAIT_HDU_DRQ_HI	; 0
  5212                              <1> 	;MOV	cx, WAIT_HDU_DRQ_LO	; 1000 (30 milli seconds)
  5213                              <1> 					; (but it is written as 2000
  5214                              <1> 					; micro seconds in ATORGS.ASM file
  5215                              <1> 					; of Award Bios - 1999, D1A0622)
  5216 00005A99 B9E8030000          <1> 	mov 	ecx, WAIT_HDU_DRQ_LH ; 21/02/2015 
  5217 00005A9E EC                  <1> WQ_1:	IN	AL,DX			; GET STATUS
  5218 00005A9F A808                <1> 	TEST	AL,ST_DRQ		; WAIT FOR DRQ
  5219 00005AA1 7516                <1> 	JNZ	short WQ_OK
  5220                              <1> 	;LOOP	WQ_1			; KEEP TRYING FOR A SHORT WHILE
  5221                              <1> WQ_hi:	
  5222 00005AA3 E461                <1> 	IN	AL,SYS1			; wait for hi to lo
  5223 00005AA5 A810                <1> 	TEST	AL,010H			; transition on memory
  5224 00005AA7 75FA                <1> 	JNZ	SHORT WQ_hi		; refresh.
  5225 00005AA9 E461                <1> WQ_lo:  IN      AL,SYS1
  5226 00005AAB A810                <1> 	TEST	AL,010H
  5227 00005AAD 74FA                <1> 	JZ	SHORT WQ_lo
  5228 00005AAF E2ED                <1> 	LOOP	WQ_1
  5229                              <1> 
  5230 00005AB1 C605[2B820100]80    <1>         MOV     byte [DISK_STATUS1],TIME_OUT ; ERROR
  5231 00005AB8 F9                  <1> 	STC
  5232                              <1> WQ_OK:
  5233 00005AB9 C3                  <1> 	RETn
  5234                              <1> ;WQ_OK:	;CLC
  5235                              <1> ;	RETn
  5236                              <1> 
  5237                              <1> ;----------------------------------------
  5238                              <1> ;	CHECK FIXED DISK STATUS 	:
  5239                              <1> ;----------------------------------------
  5240                              <1> CHECK_STATUS:
  5241 00005ABA E813000000          <1> 	CALL	CHECK_ST		; CHECK THE STATUS BYTE
  5242 00005ABF 7509                <1> 	JNZ	short CHECK_S1		; AN ERROR WAS FOUND
  5243 00005AC1 A801                <1> 	TEST	AL,ST_ERROR		; WERE THERE ANY OTHER ERRORS
  5244 00005AC3 7405                <1> 	JZ	short CHECK_S1		; NO ERROR REPORTED
  5245 00005AC5 E849000000          <1> 	CALL	CHECK_ER		; ERROR REPORTED
  5246                              <1> CHECK_S1:
  5247 00005ACA 803D[2B820100]00    <1> 	CMP	byte [DISK_STATUS1],0 	; SET STATUS FOR CALLER
  5248 00005AD1 C3                  <1> 	RETn
  5249                              <1> 
  5250                              <1> ;----------------------------------------
  5251                              <1> ;	CHECK FIXED DISK STATUS BYTE	:
  5252                              <1> ;----------------------------------------
  5253                              <1> CHECK_ST:
  5254                              <1> 	;MOV	DX,HF_PORT+7		; GET THE STATUS
  5255 00005AD2 668B15[E06D0000]    <1> 	mov	dx, [HF_PORT]
  5256 00005AD9 80C207              <1> 	add	dl, 7
  5257                              <1> 	
  5258                              <1> 	; 17/02/2016
  5259                              <1> 	;(http://wiki.osdev.org/ATA_PIO_Mode)
  5260                              <1> 	;"delay 400ns to allow drive to set new values of BSY and DRQ"
  5261 00005ADC EC                  <1> 	IN	AL,DX
  5262                              <1> 	;in	al, dx ; 100ns
  5263                              <1> 	;in	al, dx ; 100ns
  5264                              <1>  	;in	al, dx ; 100ns
  5265                              <1> 	NEWIODELAY ; 18/02/2016 (AWARD BIOS - 1999, 'CKST' in AHSDK.ASM)
  5265 00005ADD E6EB                <2>  out 0ebh,al
  5266                              <1> 	;
  5267 00005ADF A2[21820100]        <1> 	MOV	[HF_STATUS],AL
  5268 00005AE4 B400                <1> 	MOV	AH,0
  5269 00005AE6 A880                <1> 	TEST	AL,ST_BUSY		; IF STILL BUSY
  5270 00005AE8 751A                <1> 	JNZ	short CKST_EXIT		;  REPORT OK
  5271 00005AEA B4CC                <1> 	MOV	AH,WRITE_FAULT
  5272 00005AEC A820                <1> 	TEST	AL,ST_WRT_FLT		; CHECK FOR WRITE FAULT
  5273 00005AEE 7514                <1> 	JNZ	short CKST_EXIT
  5274 00005AF0 B4AA                <1> 	MOV	AH,NOT_RDY
  5275 00005AF2 A840                <1> 	TEST	AL,ST_READY		; CHECK FOR NOT READY
  5276 00005AF4 740E                <1> 	JZ	short CKST_EXIT
  5277 00005AF6 B440                <1> 	MOV	AH,BAD_SEEK
  5278 00005AF8 A810                <1> 	TEST	AL,ST_SEEK_COMPL	; CHECK FOR SEEK NOT COMPLETE
  5279 00005AFA 7408                <1> 	JZ	short CKST_EXIT
  5280 00005AFC B411                <1> 	MOV	AH,DATA_CORRECTED
  5281 00005AFE A804                <1> 	TEST	AL,ST_CORRCTD		; CHECK FOR CORRECTED ECC
  5282 00005B00 7502                <1> 	JNZ	short CKST_EXIT
  5283 00005B02 B400                <1> 	MOV	AH,0
  5284                              <1> CKST_EXIT:
  5285 00005B04 8825[2B820100]      <1> 	MOV	[DISK_STATUS1],AH	; SET ERROR FLAG
  5286 00005B0A 80FC11              <1> 	CMP	AH,DATA_CORRECTED	; KEEP GOING WITH DATA CORRECTED
  5287 00005B0D 7403                <1> 	JZ	short CKST_EX1
  5288 00005B0F 80FC00              <1> 	CMP	AH,0
  5289                              <1> CKST_EX1:
  5290 00005B12 C3                  <1> 	RETn
  5291                              <1> 
  5292                              <1> ;----------------------------------------
  5293                              <1> ;	CHECK FIXED DISK ERROR REGISTER :
  5294                              <1> ;----------------------------------------
  5295                              <1> CHECK_ER:
  5296                              <1> 	;MOV	DX, HF_PORT+1		; GET THE ERROR REGISTER
  5297 00005B13 668B15[E06D0000]    <1> 	mov	dx, [HF_PORT]		;
  5298 00005B1A FEC2                <1> 	inc	dl
  5299 00005B1C EC                  <1> 	IN	AL,DX
  5300 00005B1D A2[22820100]        <1> 	MOV	[HF_ERROR],AL
  5301 00005B22 53                  <1> 	PUSH	eBX ; 21/02/2015
  5302 00005B23 B908000000          <1> 	MOV	eCX,8			; TEST ALL 8 BITS
  5303 00005B28 D0E0                <1> CK1:	SHL	AL,1			; MOVE NEXT ERROR BIT TO CARRY
  5304 00005B2A 7202                <1> 	JC	short CK2		; FOUND THE ERROR
  5305 00005B2C E2FA                <1> 	LOOP	CK1			; KEEP TRYING
  5306 00005B2E BB[D46D0000]        <1> CK2:	MOV	eBX, ERR_TBL		; COMPUTE ADDRESS OF
  5307 00005B33 01CB                <1> 	ADD	eBX,eCX			; ERROR CODE
  5308                              <1> 	;;MOV	AH,BYTE [CS:BX]		; GET ERROR CODE
  5309                              <1> 	;mov	ah, [bx]
  5310 00005B35 8A23                <1> 	mov	ah, [ebx] ; 21/02/2015	
  5311 00005B37 8825[2B820100]      <1> CKEX:	MOV	[DISK_STATUS1],AH	; SAVE ERROR CODE
  5312 00005B3D 5B                  <1> 	POP	eBX
  5313 00005B3E 80FC00              <1> 	CMP	AH,0
  5314 00005B41 C3                  <1> 	RETn
  5315                              <1> 
  5316                              <1> ;--------------------------------------------------------
  5317                              <1> ; CHECK_DMA						:
  5318                              <1> ;  -CHECK ES:BX AND # SECTORS TO MAKE SURE THAT IT WILL :
  5319                              <1> ;   FIT WITHOUT SEGMENT OVERFLOW.			:
  5320                              <1> ;  -ES:BX HAS BEEN REVISED TO THE FORMAT SSSS:000X	:
  5321                              <1> ;  -OK IF # SECTORS < 80H (7FH IF LONG READ OR WRITE)	:
  5322                              <1> ;  -OK IF # SECTORS = 80H (7FH) AND BX <= 00H (04H)	:
  5323                              <1> ;  -ERROR OTHERWISE					:
  5324                              <1> ;--------------------------------------------------------
  5325                              <1> CHECK_DMA:
  5326 00005B42 6650                <1> 	PUSH	AX			; SAVE REGISTERS
  5327 00005B44 66B80080            <1> 	MOV	AX,8000H		; AH = MAX # SECTORS AL = MAX OFFSET
  5328 00005B48 F645FE02            <1>         TEST    byte [CMD_BLOCK+6],ECC_MODE
  5329 00005B4C 7404                <1> 	JZ	short CKD1
  5330 00005B4E 66B8047F            <1> 	MOV	AX,7F04H		; ECC IS 4 MORE BYTES
  5331 00005B52 3A65F9              <1> CKD1:	CMP	AH, [CMD_BLOCK+1] 	; NUMBER OF SECTORS
  5332 00005B55 7706                <1> 	JA	short CKDOK		; IT WILL FIT
  5333 00005B57 7208                <1> 	JB	short CKDERR		; TOO MANY
  5334 00005B59 38D8                <1> 	CMP	AL,BL			; CHECK OFFSET ON MAX SECTORS
  5335 00005B5B 7204                <1> 	JB	short CKDERR		; ERROR
  5336 00005B5D F8                  <1> CKDOK:	CLC				; CLEAR CARRY
  5337 00005B5E 6658                <1> 	POP	AX
  5338 00005B60 C3                  <1> 	RETn				; NORMAL RETURN
  5339 00005B61 F9                  <1> CKDERR: STC				; INDICATE ERROR
  5340 00005B62 C605[2B820100]09    <1>         MOV     byte [DISK_STATUS1],DMA_BOUNDARY
  5341 00005B69 6658                <1> 	POP	AX
  5342 00005B6B C3                  <1> 	RETn
  5343                              <1> 
  5344                              <1> ;----------------------------------------
  5345                              <1> ;	SET UP ES:BX-> DISK PARMS	:
  5346                              <1> ;----------------------------------------
  5347                              <1> 					
  5348                              <1> ; INPUT -> DL = 0 based drive number
  5349                              <1> ; OUTPUT -> ES:BX = disk parameter table address
  5350                              <1> 
  5351                              <1> GET_VEC:
  5352                              <1> 	;SUB	AX,AX			; GET DISK PARAMETER ADDRESS
  5353                              <1> 	;MOV	ES,AX
  5354                              <1> 	;TEST	DL,1
  5355                              <1> 	;JZ	short GV_0
  5356                              <1> ;	LES	BX,[HF1_TBL_VEC] 	; ES:BX -> DRIVE PARAMETERS
  5357                              <1> ;	JMP	SHORT GV_EXIT
  5358                              <1> ;GV_0:
  5359                              <1> ;	LES	BX,[HF_TBL_VEC]		; ES:BX -> DRIVE PARAMETERS
  5360                              <1> ;
  5361                              <1> 	;xor	bh, bh
  5362 00005B6C 31DB                <1> 	xor	ebx, ebx
  5363 00005B6E 88D3                <1> 	mov	bl, dl
  5364                              <1> 	;;02/01/2015
  5365                              <1> 	;;shl	bl, 1			; port address offset
  5366                              <1> 	;;mov	ax, [bx+hd_ports]	; Base port address (1F0h, 170h)
  5367                              <1> 	;;shl	bl, 1			; dpt pointer offset
  5368 00005B70 C0E302              <1> 	shl	bl, 2	;;
  5369                              <1> 	;add	bx, HF_TBL_VEC		; Disk parameter table pointer
  5370 00005B73 81C3[30820100]      <1> 	add	ebx, HF_TBL_VEC ; 21/02/2015
  5371                              <1> 	;push	word [bx+2]		; dpt segment
  5372                              <1> 	;pop	es
  5373                              <1> 	;mov	bx, [bx]		; dpt offset
  5374 00005B79 8B1B                <1> 	mov	ebx, [ebx]		
  5375                              <1> ;GV_EXIT:
  5376 00005B7B C3                  <1> 	RETn
  5377                              <1> 
  5378                              <1> hdc1_int: ; 21/02/2015
  5379                              <1> ;--- HARDWARE INT 76H -- ( IRQ LEVEL  14 ) ----------------------
  5380                              <1> ;								:
  5381                              <1> ;	FIXED DISK INTERRUPT ROUTINE				:
  5382                              <1> ;								:
  5383                              <1> ;----------------------------------------------------------------
  5384                              <1> 
  5385                              <1> ; 22/12/2014
  5386                              <1> ; IBM PC-XT Model 286 System BIOS Source Code - DISK.ASM (HD_INT)
  5387                              <1> ;	 '11/15/85'
  5388                              <1> ; AWARD BIOS 1999 (D1A0622) 
  5389                              <1> ;	Source Code - ATORGS.ASM (INT_HDISK, INT_HDISK1)
  5390                              <1> 
  5391                              <1> ;int_76h:
  5392                              <1> HD_INT:
  5393 00005B7C 6650                <1> 	PUSH	AX
  5394 00005B7E 1E                  <1> 	PUSH	DS
  5395                              <1> 	;CALL	DDS
  5396                              <1> 	; 21/02/2015 (32 bit, 386 pm modification)
  5397 00005B7F 66B81000            <1> 	mov	ax, KDATA
  5398 00005B83 8ED8                <1> 	mov 	ds, ax
  5399                              <1> 	;
  5400                              <1> 	;;MOV	@HF_INT_FLAG,0FFH	; ALL DONE
  5401                              <1>         ;mov     byte [CS:HF_INT_FLAG], 0FFh
  5402 00005B85 C605[23820100]FF    <1> 	mov	byte [HF_INT_FLAG], 0FFh
  5403                              <1> 	;
  5404 00005B8C 6652                <1> 	push	dx
  5405 00005B8E 66BAF701            <1> 	mov	dx, HDC1_BASEPORT+7	; Status Register (1F7h)
  5406                              <1> 					; Clear Controller
  5407                              <1> Clear_IRQ1415:				; (Award BIOS - 1999)
  5408 00005B92 EC                  <1> 	in	al, dx			;
  5409 00005B93 665A                <1> 	pop	dx
  5410                              <1> 	NEWIODELAY
  5410 00005B95 E6EB                <2>  out 0ebh,al
  5411                              <1> 	;
  5412 00005B97 B020                <1> 	MOV	AL,EOI			; NON-SPECIFIC END OF INTERRUPT
  5413 00005B99 E6A0                <1> 	OUT	INTB00,AL		; FOR CONTROLLER #2
  5414                              <1> 	;JMP	$+2			; WAIT
  5415                              <1> 	NEWIODELAY
  5415 00005B9B E6EB                <2>  out 0ebh,al
  5416 00005B9D E620                <1> 	OUT	INTA00,AL		; FOR CONTROLLER #1
  5417 00005B9F 1F                  <1> 	POP	DS
  5418                              <1> 	;STI				; RE-ENABLE INTERRUPTS
  5419                              <1> 	;MOV	AX,9100H		; DEVICE POST
  5420                              <1> 	;INT	15H			;  INTERRUPT
  5421                              <1> irq15_iret: ; 25/02/2015
  5422 00005BA0 6658                <1> 	POP	AX
  5423 00005BA2 CF                  <1> 	IRETd				; RETURN FROM INTERRUPT
  5424                              <1> 
  5425                              <1> hdc2_int: ; 21/02/2015
  5426                              <1> ;++++ HARDWARE INT 77H ++ ( IRQ LEVEL  15 ) +++++++++++++++++++++
  5427                              <1> ;								:
  5428                              <1> ;	FIXED DISK INTERRUPT ROUTINE				:
  5429                              <1> ;								:
  5430                              <1> ;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  5431                              <1> 
  5432                              <1> ;int_77h:
  5433                              <1> HD1_INT:
  5434 00005BA3 6650                <1> 	PUSH	AX
  5435                              <1> 	; Check if that is a spurious IRQ (from slave PIC)
  5436                              <1> 	; 25/02/2015 (source: http://wiki.osdev.org/8259_PIC)
  5437 00005BA5 B00B                <1> 	mov	al, 0Bh  ; In-Service Register
  5438 00005BA7 E6A0                <1> 	out	0A0h, al
  5439 00005BA9 EB00                <1>         jmp short $+2
  5440 00005BAB EB00                <1> 	jmp short $+2
  5441 00005BAD E4A0                <1> 	in	al, 0A0h
  5442 00005BAF 2480                <1> 	and 	al, 80h ; bit 7 (is it real IRQ 15 or fake?)
  5443 00005BB1 74ED                <1> 	jz	short irq15_iret ; Fake (spurious)IRQ, do not send EOI)
  5444                              <1> 	;
  5445 00005BB3 1E                  <1> 	PUSH	DS
  5446                              <1> 	;CALL	DDS
  5447                              <1> 	; 21/02/2015 (32 bit, 386 pm modification)
  5448 00005BB4 66B81000            <1> 	mov	ax, KDATA
  5449 00005BB8 8ED8                <1> 	mov 	ds, ax
  5450                              <1> 	;
  5451                              <1> 	;;MOV	@HF_INT_FLAG,0FFH	; ALL DONE
  5452                              <1>         ;or      byte [CS:HF_INT_FLAG],0C0h 
  5453 00005BBA 800D[23820100]C0    <1> 	or	byte [HF_INT_FLAG], 0C0h
  5454                              <1> 	;
  5455 00005BC1 6652                <1> 	push	dx
  5456 00005BC3 66BA7701            <1> 	mov	dx, HDC2_BASEPORT+7	; Status Register (177h)
  5457                              <1> 					; Clear Controller (Award BIOS 1999)
  5458 00005BC7 EBC9                <1> 	jmp	short Clear_IRQ1415
  5459                              <1> 
  5460                              <1> 
  5461                              <1> ;%include 'diskdata.inc' ; 11/03/2015
  5462                              <1> ;%include 'diskbss.inc' ; 11/03/2015
  5463                              <1> 
  5464                              <1> 
  5465                              <1> ;////////////////////////////////////////////////////////////////////
  5466                              <1> ;; END OF DISK I/O SYTEM ///
  2887                                  %include 'memory.s'  ; 09/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.3 - memory.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 15/12/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.15 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; memory.inc (18/10/2015)
    15                              <1> ; ****************************************************************************
    16                              <1> 
    17                              <1> ; MEMORY.ASM - Retro UNIX 386 v1 MEMORY MANAGEMENT FUNCTIONS (PROCEDURES)
    18                              <1> ; Retro UNIX 386 v1 Kernel (unix386.s, v0.2.0.14) - MEMORY.INC
    19                              <1> ; Last Modification: 18/10/2015
    20                              <1> 
    21                              <1> ; ///////// MEMORY MANAGEMENT FUNCTIONS (PROCEDURES) ///////////////
    22                              <1> 
    23                              <1> ;;04/11/2014 (unix386.s)	
    24                              <1> ;PDE_A_PRESENT	equ	1		; Present flag for PDE
    25                              <1> ;PDE_A_WRITE	equ 	2		; Writable (write permission) flag
    26                              <1> ;PDE_A_USER	equ	4		; User (non-system/kernel) page flag
    27                              <1> ;;
    28                              <1> ;PTE_A_PRESENT	equ	1		; Present flag for PTE (bit 0)
    29                              <1> ;PTE_A_WRITE	equ 	2		; Writable (write permission) flag (bit 1)
    30                              <1> ;PTE_A_USER	equ	4		; User (non-system/kernel) page flag (bit 2)
    31                              <1> ;PTE_A_ACCESS   equ	32		; Accessed flag (bit 5) ; 09/03/2015
    32                              <1> 
    33                              <1> ; 27/04/2015
    34                              <1> ; 09/03/2015
    35                              <1> PAGE_SIZE 	equ 4096		; page size in bytes
    36                              <1> PAGE_SHIFT 	equ 12			; page table shift count
    37                              <1> PAGE_D_SHIFT 	equ 22	; 12 + 10	; page directory shift count
    38                              <1> PAGE_OFF	equ 0FFFh		; 12 bit byte offset in page frame
    39                              <1> PTE_MASK 	equ 03FFh		; page table entry mask
    40                              <1> PTE_DUPLICATED  equ 200h		; duplicated page sign (AVL bit 0)
    41                              <1> PDE_A_CLEAR	equ 0F000h		; to clear PDE attribute bits
    42                              <1> PTE_A_CLEAR	equ 0F000h		; to clear PTE attribute bits
    43                              <1> LOGIC_SECT_SIZE equ 512			; logical sector size
    44                              <1> ERR_MAJOR_PF	equ 0E0h		; major error: page fault
    45                              <1> ERR_MINOR_IM	equ 4 ;15/10/2016 (1->4); insufficient (out of) memory
    46                              <1> ERR_MINOR_PV	equ 6 ;15/10/2016 (1->4); protection violation
    47                              <1> SWP_DISK_READ_ERR 	   equ 40
    48                              <1> SWP_DISK_NOT_PRESENT_ERR   equ 41
    49                              <1> SWP_SECTOR_NOT_PRESENT_ERR equ 42
    50                              <1> SWP_NO_FREE_SPACE_ERR      equ 43
    51                              <1> SWP_DISK_WRITE_ERR         equ 44
    52                              <1> SWP_NO_PAGE_TO_SWAP_ERR    equ 45
    53                              <1> PTE_A_ACCESS_BIT equ 5  ; Bit 5 (accessed flag)        
    54                              <1> SECTOR_SHIFT     equ 3  ; sector shift (to convert page block number)
    55                              <1> ; 12/07/2016
    56                              <1> PTE_SHARED	 equ 400h		; AVL bit 1, direct memory access bit	
    57                              <1> 					; (Indicates that the page is not allocated
    58                              <1> 					; for the process, it is a shared or system
    59                              <1>                                         ; page, it must not be deallocated!)
    60                              <1> ; 14/12/2020
    61                              <1> ; (Linear Frame Buffer - video memory mark : AVL bit 1, outside M.A.T.)
    62                              <1> PDE_EXTERNAL	equ 400h	; Page directory entry for external memory blocks
    63                              <1> PTE_EXTERNAL	equ 400h	; Allocated kernel pages for Linear Frame Buffer
    64                              <1> 				; (Out of memory allocation table)	
    65                              <1> 
    66                              <1> ;
    67                              <1> ;; Retro Unix 386 v1 - paging method/principles
    68                              <1> ;;
    69                              <1> ;; 10/10/2014
    70                              <1> ;; RETRO UNIX 386 v1 - PAGING METHOD/PRINCIPLES
    71                              <1> ;;
    72                              <1> ;; KERNEL PAGE MAP: 1 to 1 physical memory page map
    73                              <1> ;;	(virtual address = physical address)
    74                              <1> ;; KERNEL PAGE TABLES:
    75                              <1> ;;	Kernel page directory and all page tables are
    76                              <1> ;;	on memory as initialized, as equal to physical memory
    77                              <1> ;;	layout. Kernel pages can/must not be swapped out/in.
    78                              <1> ;;
    79                              <1> ;;	what for: User pages may be swapped out, when accessing
    80                              <1> ;;	a page in kernel/system mode, if it would be swapped out,
    81                              <1> ;;	kernel would have to swap it in! But it is also may be
    82                              <1> ;;	in use by a user process. (In system/kernel mode
    83                              <1> ;;	kernel can access all memory pages even if they are
    84                              <1> ;;	reserved/allocated for user processes. Swap out/in would
    85                              <1> ;;	cause conflicts.) 
    86                              <1> ;;	
    87                              <1> ;;	As result of these conditions,
    88                              <1> ;;	all kernel pages must be initialized as equal to 
    89                              <1> ;;	physical layout for preventing page faults. 
    90                              <1> ;;	Also, calling "allocate page" procedure after
    91                              <1> ;;	a page fault can cause another page fault (double fault)
    92                              <1> ;;	if all kernel page tables would not be initialized.
    93                              <1> ;;
    94                              <1> ;;	[first_page] = Beginning of users space, as offset to 
    95                              <1> ;;	memory allocation table. (double word aligned)
    96                              <1> ;;
    97                              <1> ;;	[next_page] = first/next free space to be searched
    98                              <1> ;;	as offset to memory allocation table. (dw aligned)
    99                              <1> ;;
   100                              <1> ;;	[last_page] = End of memory (users space), as offset
   101                              <1> ;;	to memory allocation table. (double word aligned)
   102                              <1> ;;
   103                              <1> ;; USER PAGE TABLES:
   104                              <1> ;;	Demand paging (& 'copy on write' allocation method) ...
   105                              <1> ;;		'ready only' marked copies of the 
   106                              <1> ;;		parent process's page table entries (for
   107                              <1> ;;		same physical memory).
   108                              <1> ;;		(A page will be copied to a new page after
   109                              <1> ;;		 if it causes R/W page fault.)
   110                              <1> ;;
   111                              <1> ;;	Every user process has own (different)
   112                              <1> ;;	page directory and page tables.	
   113                              <1> ;;
   114                              <1> ;;	Code starts at virtual address 0, always.
   115                              <1> ;;	(Initial value of EIP is 0 in user mode.)
   116                              <1> ;;	(Programs can be written/developed as simple
   117                              <1> ;;	 flat memory programs.)
   118                              <1> ;;
   119                              <1> ;; MEMORY ALLOCATION STRATEGY:
   120                              <1> ;;	Memory page will be allocated by kernel only 
   121                              <1> ;;		(in kernel/system mode only).
   122                              <1> ;;	* After a
   123                              <1> ;;	  - 'not present' page fault
   124                              <1> ;;	  - 'writing attempt on read only page' page fault 	 	
   125                              <1> ;;	* For loading (opening, reading) a file or disk/drive
   126                              <1> ;;	* As responce to 'allocate additional memory blocks' 
   127                              <1> ;;	  request by running process.
   128                              <1> ;;	* While creating a process, allocating a new buffer,
   129                              <1> ;;	  new page tables etc.
   130                              <1> ;;
   131                              <1> ;;	At first,
   132                              <1> ;;	- 'allocate page' procedure will be called;
   133                              <1> ;,	   if it will return with a valid (>0) physical address
   134                              <1> ;;	   (that means the relevant M.A.T. bit has been RESET)	
   135                              <1> ;;	   relevant memory page/block will be cleared (zeroed).
   136                              <1> ;;	- 'allocate page' will be called for allocating page
   137                              <1> ;;	   directory, page table and running space (data/code).
   138                              <1> ;;	- every successful 'allocate page' call will decrease
   139                              <1> ;;	  'free_pages' count (pointer).
   140                              <1> ;;	- 'out of (insufficient) memory error' will be returned
   141                              <1> ;;	  if 'free_pages' points to a ZERO.
   142                              <1> ;;	- swapping out and swapping in (if it is not a new page)
   143                              <1> ;;	  procedures will be called as responce to 'out of memory'
   144                              <1> ;;	  error except errors caused by attribute conflicts.
   145                              <1> ;;	 (swapper functions)	 
   146                              <1> ;;					
   147                              <1> ;;	At second,
   148                              <1> ;;	- page directory entry will be updated then page table
   149                              <1> ;;	  entry will be updated.		
   150                              <1> ;;
   151                              <1> ;; MEMORY ALLOCATION TABLE FORMAT:
   152                              <1> ;;	- M.A.T. has a size according to available memory as
   153                              <1> ;;	  follows:
   154                              <1> ;;		  - 1 (allocation) bit per 1 page (4096 bytes)
   155                              <1> ;;		  - a bit with value of 0 means allocated page
   156                              <1> ;;		  - a bit with value of 1 means a free page
   157                              <1> ;,	- 'free_pages' pointer holds count of free pages
   158                              <1> ;;	  depending on M.A.T.
   159                              <1> ;;		(NOTE: Free page count will not be checked
   160                              <1> ;;		again -on M.A.T.- after initialization. 
   161                              <1> ;;		Kernel will trust on initial count.)
   162                              <1> ;,	- 'free_pages' count will be decreased by allocation
   163                              <1> ;;	  and it will be increased by deallocation procedures.
   164                              <1> ;;	
   165                              <1> ;;	- Available memory will be calculated during
   166                              <1> ;;	  the kernel's initialization stage (in real mode).
   167                              <1> ;;	  Memory allocation table and kernel page tables 
   168                              <1> ;;	  will be formatted/sized as result of available
   169                              <1> ;;	  memory calculation before paging is enabled.
   170                              <1> ;;
   171                              <1> ;; For 4GB Available/Present Memory: (max. possible memory size)
   172                              <1> ;;	- Memory Allocation Table size will be 128 KB.
   173                              <1> ;;	- Memory allocation for kernel page directory size 
   174                              <1> ;;	  is always 4 KB. (in addition to total allocation size
   175                              <1> ;;	  for page tables)
   176                              <1> ;;	- Memory allocation for kernel page tables (1024 tables)
   177                              <1> ;;	  is 4 MB (1024*4*1024 bytes).
   178                              <1> ;;	- User (available) space will be started 
   179                              <1> ;;	  at 6th MB of the memory (after 1MB+4MB).
   180                              <1> ;;	- The first 640 KB is for kernel's itself plus
   181                              <1> ;;	  memory allocation table and kernel's page directory
   182                              <1> ;;	  (D0000h-EFFFFh may be used as kernel space...)	
   183                              <1> ;;	- B0000h to B7FFFh address space (32 KB) will be used
   184                              <1> ;; 	  for buffers.
   185                              <1> ;;	- ROMBIOS, VIDEO BUFFER and VIDEO ROM space are reserved.
   186                              <1> ;,	  (A0000h-AFFFFh, C0000h-CFFFFh, F0000h-FFFFFh)
   187                              <1> ;;	- Kernel page tables start at 100000h (2nd MB)
   188                              <1> ;;
   189                              <1> ;; For 1GB Available Memory:
   190                              <1> ;;	- Memory Allocation Table size will be 32 KB.
   191                              <1> ;;	- Memory allocation for kernel page directory size 
   192                              <1> ;;	  is always 4 KB. (in addition to total allocation size
   193                              <1> ;;	  for page tables)
   194                              <1> ;;	- Memory allocation for kernel page tables (256 tables)
   195                              <1> ;;	  is 1 MB (256*4*1024 bytes).
   196                              <1> ;;	- User (available) space will be started 
   197                              <1> ;;	  at 3th MB of the memory (after 1MB+1MB).
   198                              <1> ;;	- The first 640 KB is for kernel's itself plus
   199                              <1> ;;	  memory allocation table and kernel's page directory
   200                              <1> ;;	  (D0000h-EFFFFh may be used as kernel space...)	
   201                              <1> ;;	- B0000h to B7FFFh address space (32 KB) will be used
   202                              <1> ;; 	  for buffers.
   203                              <1> ;;	- ROMBIOS, VIDEO BUFFER and VIDEO ROM space are reserved.
   204                              <1> ;,	  (A0000h-AFFFFh, C0000h-CFFFFh, F0000h-FFFFFh)
   205                              <1> ;;	- Kernel page tables start at 100000h (2nd MB).	
   206                              <1> ;;
   207                              <1> ;;
   208                              <1> 
   209                              <1> 
   210                              <1> ;;************************************************************************************
   211                              <1> ;; 
   212                              <1> ;; RETRO UNIX 386 v1 - Paging (Method for Copy On Write paging principle)
   213                              <1> ;; DEMAND PAGING - PARENT&CHILD PAGE TABLE DUPLICATION PRINCIPLES (23/04/2015)
   214                              <1> 
   215                              <1> ;; Main factor: "sys fork" system call 
   216                              <1> ;;	
   217                              <1> ;; 		FORK
   218                              <1> ;;                      |----> parent - duplicated PTEs, read only pages
   219                              <1> ;;  writable pages ---->|
   220                              <1> ;;                      |----> child - duplicated PTEs, read only pages
   221                              <1> ;; 
   222                              <1> ;; AVL bit (0) of Page Table Entry is used as duplication sign 
   223                              <1> ;; 
   224                              <1> ;; AVL Bit 0 [PTE Bit 9] = 'Duplicated PTE belongs to child' sign/flag (if it is set)
   225                              <1> ;; Note: Dirty bit (PTE bit 6) may be used instead of AVL bit 0 (PTE bit 9)
   226                              <1> ;;       -while R/W bit is 0-. 
   227                              <1> ;; 
   228                              <1> ;; Duplicate page tables with writable pages (the 1st sys fork in the process):
   229                              <1> ;; # Parent's Page Table Entries are updated to point same pages as read only, 
   230                              <1> ;;   as duplicated PTE bit  -AVL bit 0, PTE bit 9- are reset/clear.
   231                              <1> ;; # Then Parent's Page Table is copied to Child's Page Table.
   232                              <1> ;; # Child's Page Table Entries are updated as duplicated child bit
   233                              <1> ;;   -AVL bit 0, PTE bit 9- is set.	  
   234                              <1> ;; 
   235                              <1> ;; Duplicate page tables with read only pages (several sys fork system calls):
   236                              <1> ;; # Parent's read only pages are copied to new child pages. 
   237                              <1> ;;   Parent's PTE attributes are not changed.
   238                              <1> ;;   (Because, there is another parent-child fork before this fork! We must not
   239                              <1> ;;    destroy/mix previous fork result).
   240                              <1> ;; # Child's Page Table Entries (which are corresponding to Parent's 
   241                              <1> ;;   read only pages) are set as writable (while duplicated PTE bit is clear). 
   242                              <1> ;; # Parent's PTEs with writable page attribute are updated to point same pages 
   243                              <1> ;;   as read only, (while) duplicated PTE bit is reset (clear).
   244                              <1> ;; # Parent's Page Table Entries (with writable page attribute) are duplicated 
   245                              <1> ;;   as Child's Page Table Entries without copying actual page.
   246                              <1> ;; # Child 's Page Table Entries (which are corresponding to Parent's writable 
   247                              <1> ;;   pages) are updated as duplicated PTE bit (AVL bit 0, PTE bit 9- is set.
   248                              <1> ;; 
   249                              <1> ;; !? WHAT FOR (duplication after duplication):
   250                              <1> ;; In UNIX method for sys fork (a typical 'fork' application in /etc/init)
   251                              <1> ;; program/executable code continues from specified location as child process, 
   252                              <1> ;; returns back previous code location as parent process, every child after 
   253                              <1> ;; every sys fork uses last image of code and data just prior the fork.
   254                              <1> ;; Even if the parent code changes data, the child will not see the changed data 
   255                              <1> ;; after the fork. In Retro UNIX 8086 v1, parent's process segment (32KB)
   256                              <1> ;; was copied to child's process segment (all of code and data) according to
   257                              <1> ;; original UNIX v1 which copies all of parent process code and data -core- 
   258                              <1> ;; to child space -core- but swaps that core image -of child- on to disk.
   259                              <1> ;; If I (Erdogan Tan) would use a method of to copy parent's core
   260                              <1> ;; (complete running image of parent process) to the child process; 
   261                              <1> ;; for big sizes, i would force Retro UNIX 386 v1 to spend many memory pages 
   262                              <1> ;; and times only for a sys fork. (It would excessive reservation for sys fork,
   263                              <1> ;; because sys fork usually is prior to sys exec; sys exec always establishes
   264                              <1> ;; a new/fresh core -running space-, by clearing all code/data content). 
   265                              <1> ;; 'Read Only' page flag ensures page fault handler is needed only for a few write
   266                              <1> ;; attempts between sys fork and sys exec, not more... (I say so by thinking 
   267                              <1> ;; of "/etc/init" content, specially.) sys exec will clear page tables and
   268                              <1> ;; new/fresh pages will be used to load and run new executable/program.
   269                              <1> ;; That is what for i have preferred "copy on write", "duplication" method
   270                              <1> ;; for sharing same read only pages between parent and child processes.
   271                              <1> ;; That is a pitty i have to use new private flag (AVL bit 0, "duplicated PTE 
   272                              <1> ;; belongs to child" sign) for cooperation on duplicated pages between a parent 
   273                              <1> ;; and it's child processes; otherwise parent process would destroy data belongs
   274                              <1> ;; to its child or vice versa; or some pages would remain unclaimed 
   275                              <1> ;; -deallocation problem-.
   276                              <1> ;; Note: to prevent conflicts, read only pages must not be swapped out... 
   277                              <1> ;; 
   278                              <1> ;; WHEN PARENT TRIES TO WRITE IT'S READ ONLY (DUPLICATED) PAGE:
   279                              <1> ;; # Page fault handler will do those:
   280                              <1> ;;   - 'Duplicated PTE' flag (PTE bit 9) is checked (on the failed PTE).
   281                              <1> ;;   - If it is reset/clear, there is a child uses same page.
   282                              <1> ;;   - Parent's read only page -previous page- is copied to a new writable page. 
   283                              <1> ;;   - Parent's PTE is updated as writable page, as unique page (AVL=0)
   284                              <1> ;;   - (Page fault handler whill check this PTE later, if child process causes to
   285                              <1> ;;     page fault due to write attempt on read only page. Of course, the previous 
   286                              <1> ;;     read only page will be converted to writable and unique page which belongs
   287                              <1> ;;     to child process.)	
   288                              <1> ;; WHEN CHILD TRIES TO WRITE IT'S READ ONLY (DUPLICATED) PAGE:
   289                              <1> ;; # Page fault handler will do those:
   290                              <1> ;;   - 'Duplicated PTE' flag (PTE bit 9) is checked (on the failed PTE).
   291                              <1> ;;   - If it is set, there is a parent uses -or was using- same page.
   292                              <1> ;;   - Same PTE address within parent's page table is checked if it has same page
   293                              <1> ;;     address or not. 
   294                              <1> ;;   - If parent's PTE has same address, child will continue with a new writable page.
   295                              <1> ;;     Parent's PTE will point to same (previous) page as writable, unique (AVL=0).	
   296                              <1> ;;   - If parent's PTE has different address, child will continue with it's 
   297                              <1> ;;     own/same page but read only flag (0) will be changed to writable flag (1) and
   298                              <1> ;;     'duplicated PTE (belongs to child)' flag/sign will be cleared/reset. 	  	
   299                              <1> ;; 
   300                              <1> ;; NOTE: When a child process is terminated, read only flags of parent's page tables
   301                              <1> ;;       will be set as writable (and unique) in case of child process was using 
   302                              <1> ;;       same pages with duplicated child PTE sign... Depending on sys fork and 
   303                              <1> ;;       duplication method details, it is not possible multiple child processes
   304                              <1> ;;       were using same page with duplicated PTEs.
   305                              <1> ;; 
   306                              <1> ;;************************************************************************************   
   307                              <1> 
   308                              <1> ;; 08/10/2014
   309                              <1> ;; 11/09/2014 - Retro UNIX 386 v1 PAGING (further) draft
   310                              <1> ;;		by Erdogan Tan (Based on KolibriOS 'memory.inc')
   311                              <1> 
   312                              <1> ;; 'allocate_page' code is derived and modified from KolibriOS
   313                              <1> ;; 'alloc_page' procedure in 'memory.inc' 
   314                              <1> ;; (25/08/2014, Revision: 5057) file 
   315                              <1> ;; by KolibriOS Team (2004-2012)
   316                              <1> 
   317                              <1> allocate_page:
   318                              <1> 	; 01/07/2015
   319                              <1> 	; 05/05/2015
   320                              <1> 	; 30/04/2015
   321                              <1> 	; 16/10/2014
   322                              <1> 	; 08/10/2014
   323                              <1> 	; 09/09/2014 (Retro UNIX 386 v1 - beginning)
   324                              <1> 	;
   325                              <1> 	; INPUT -> none
   326                              <1> 	;
   327                              <1> 	; OUTPUT ->
   328                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE ALLOCATED PAGE
   329                              <1> 	;	(corresponding MEMORY ALLOCATION TABLE bit is RESET)
   330                              <1> 	;
   331                              <1> 	;	CF = 1 and EAX = 0 
   332                              <1> 	; 		   if there is not a free page to be allocated	
   333                              <1> 	;
   334                              <1> 	; Modified Registers -> none (except EAX)
   335                              <1> 	;
   336 00005BC9 A1[98810100]        <1> 	mov	eax, [free_pages]
   337 00005BCE 21C0                <1> 	and	eax, eax
   338 00005BD0 7438                <1> 	jz	short out_of_memory
   339                              <1> 	;
   340 00005BD2 53                  <1> 	push	ebx
   341 00005BD3 51                  <1> 	push	ecx
   342                              <1> 	;
   343 00005BD4 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table offset
   344 00005BD9 89D9                <1> 	mov	ecx, ebx
   345                              <1>  				     ; NOTE: 32 (first_page) is initial
   346                              <1> 				     ; value of [next_page].
   347                              <1> 				     ; It points to the first available
   348                              <1> 				     ; page block for users (ring 3) ...	
   349                              <1> 				     ; (MAT offset 32 = 1024/32)	
   350                              <1> 				     ; (at the of the first 4 MB)		
   351 00005BDB 031D[9C810100]      <1> 	add	ebx, [next_page] ; Free page searching starts from here
   352                              <1> 				 ; next_free_page >> 5
   353 00005BE1 030D[A0810100]      <1> 	add	ecx, [last_page] ; Free page searching ends here
   354                              <1> 				 ; (total_pages - 1) >> 5
   355                              <1> al_p_scan:
   356 00005BE7 39CB                <1> 	cmp	ebx, ecx
   357 00005BE9 770A                <1> 	ja	short al_p_notfound
   358                              <1> 	;
   359                              <1> 	; 01/07/2015
   360                              <1> 	; AMD64 Architecture Programmers Manual
   361                              <1> 	; Volume 3:
   362                              <1> 	; General-Purpose and System Instructions
   363                              <1> 	;
   364                              <1> 	; BSF - Bit Scan Forward
   365                              <1> 	;
   366                              <1> 	;   Searches the value in a register or a memory location
   367                              <1> 	;   (second operand) for the least-significant set bit. 
   368                              <1> 	;   If a set bit is found, the instruction clears the zero flag (ZF)
   369                              <1> 	;   and stores the index of the least-significant set bit in a destination
   370                              <1> 	;   register (first operand). If the second operand contains 0, 
   371                              <1> 	;   the instruction sets ZF to 1 and does not change the contents of the 
   372                              <1> 	;   destination register. The bit index is an unsigned offset from bit 0 
   373                              <1> 	;   of the searched value
   374                              <1> 	;
   375 00005BEB 0FBC03              <1> 	bsf	eax, [ebx] ; Scans source operand for first bit set (1).
   376                              <1> 			   ; Clear ZF if a bit is found set (1) and 
   377                              <1> 			   ; loads the destination with an index to
   378                              <1> 			   ; first set bit. (0 -> 31) 
   379                              <1> 			   ; Sets ZF to 1 if no bits are found set.
   380 00005BEE 7525                <1> 	jnz	short al_p_found ; ZF = 0 -> a free page has been found
   381                              <1> 			 ;
   382                              <1> 			 ; NOTE:  a Memory Allocation Table bit 
   383                              <1> 			 ;	  with value of 1 means 
   384                              <1> 			 ;	  the corresponding page is free 
   385                              <1> 			 ;	  (Retro UNIX 386 v1 feature only!)
   386 00005BF0 83C304              <1> 	add	ebx, 4
   387                              <1> 			 ; We return back for searching next page block
   388                              <1> 			 ; NOTE: [free_pages] is not ZERO; so, 
   389                              <1> 			 ;	 we always will find at least 1 free page here.
   390 00005BF3 EBF2                <1>         jmp     short al_p_scan
   391                              <1> 	;
   392                              <1> al_p_notfound:
   393 00005BF5 81E900001000        <1> 	sub	ecx, MEM_ALLOC_TBL
   394 00005BFB 890D[9C810100]      <1> 	mov	[next_page], ecx ; next/first free page = last page 
   395                              <1> 				 ; (deallocate_page procedure will change it)
   396 00005C01 31C0                <1> 	xor	eax, eax
   397 00005C03 A3[98810100]        <1> 	mov	[free_pages], eax ; 0
   398 00005C08 59                  <1> 	pop	ecx
   399 00005C09 5B                  <1> 	pop	ebx
   400                              <1> 	;
   401                              <1> out_of_memory:
   402 00005C0A E85B040000          <1> 	call	swap_out
   403 00005C0F 7325                <1> 	jnc	short al_p_ok  ; [free_pages] = 0, re-allocation by swap_out
   404                              <1> 	;
   405 00005C11 29C0                <1> 	sub 	eax, eax ; 0
   406 00005C13 F9                  <1> 	stc
   407 00005C14 C3                  <1> 	retn
   408                              <1> 
   409                              <1> al_p_found:
   410 00005C15 89D9                <1> 	mov	ecx, ebx
   411 00005C17 81E900001000        <1> 	sub	ecx, MEM_ALLOC_TBL
   412 00005C1D 890D[9C810100]      <1> 	mov	[next_page], ecx ; Set first free page searching start
   413                              <1> 				 ; address/offset (to the next)
   414 00005C23 FF0D[98810100]      <1>         dec     dword [free_pages] ; 1 page has been allocated (X = X-1) 
   415                              <1> 	;
   416 00005C29 0FB303              <1> 	btr	[ebx], eax	 ; The destination bit indexed by the source value
   417                              <1> 				 ; is copied into the Carry Flag and then cleared
   418                              <1> 				 ; in the destination.
   419                              <1> 				 ;
   420                              <1> 				 ; Reset the bit which is corresponding to the 
   421                              <1> 				 ; (just) allocated page.
   422                              <1> 	; 01/07/2015 (4*8 = 32, 1 allocation byte = 8 pages)	
   423 00005C2C C1E103              <1> 	shl	ecx, 3		 ; (page block offset * 32) + page index
   424 00005C2F 01C8                <1> 	add	eax, ecx	 ; = page number
   425 00005C31 C1E00C              <1> 	shl	eax, 12		 ; physical address of the page (flat/real value)
   426                              <1> 	; EAX = physical address of memory page
   427                              <1> 	;
   428                              <1> 	; NOTE: The relevant page directory and page table entry will be updated
   429                              <1> 	;       according to this EAX value...
   430 00005C34 59                  <1> 	pop	ecx
   431 00005C35 5B                  <1> 	pop	ebx
   432                              <1> al_p_ok:
   433 00005C36 C3                  <1> 	retn
   434                              <1> 
   435                              <1> 
   436                              <1> make_page_dir:
   437                              <1> 	; 18/04/2015
   438                              <1> 	; 12/04/2015
   439                              <1> 	; 23/10/2014
   440                              <1> 	; 16/10/2014
   441                              <1> 	; 09/10/2014 ; (Retro UNIX 386 v1 - beginning)
   442                              <1> 	;
   443                              <1> 	; INPUT ->
   444                              <1> 	;	none
   445                              <1> 	; OUTPUT ->
   446                              <1> 	;	(EAX = 0)
   447                              <1> 	;	cf = 1 -> insufficient (out of) memory error
   448                              <1> 	;	cf = 0 ->
   449                              <1> 	;	u.pgdir = page directory (physical) address of the current
   450                              <1> 	;		  process/user.
   451                              <1> 	;
   452                              <1> 	; Modified Registers -> EAX
   453                              <1> 	;
   454 00005C37 E88DFFFFFF          <1> 	call	allocate_page
   455 00005C3C 7216                <1> 	jc	short mkpd_error
   456                              <1> 	;
   457 00005C3E A3[B8030300]        <1> 	mov	[u.pgdir], eax    ; Page dir address for current user/process
   458                              <1> 				  ; (Physical address)
   459                              <1> clear_page:
   460                              <1> 	; 18/04/2015
   461                              <1> 	; 09/10/2014 ; (Retro UNIX 386 v1 - beginning)
   462                              <1> 	;
   463                              <1> 	; INPUT ->
   464                              <1> 	;	EAX = physical address of the page
   465                              <1> 	; OUTPUT ->
   466                              <1> 	;	all bytes of the page will be cleared
   467                              <1> 	;
   468                              <1> 	; Modified Registers -> none
   469                              <1> 	;
   470 00005C43 57                  <1> 	push	edi
   471 00005C44 51                  <1> 	push	ecx
   472 00005C45 50                  <1> 	push	eax
   473 00005C46 B900040000          <1> 	mov	ecx, PAGE_SIZE / 4
   474 00005C4B 89C7                <1> 	mov	edi, eax
   475 00005C4D 31C0                <1> 	xor	eax, eax
   476 00005C4F F3AB                <1> 	rep	stosd
   477 00005C51 58                  <1> 	pop	eax
   478 00005C52 59                  <1> 	pop	ecx
   479 00005C53 5F                  <1> 	pop	edi
   480                              <1> mkpd_error:
   481                              <1> mkpt_error:
   482 00005C54 C3                  <1> 	retn
   483                              <1> 
   484                              <1> make_page_table:
   485                              <1> 	; 23/06/2015
   486                              <1> 	; 18/04/2015
   487                              <1> 	; 12/04/2015
   488                              <1> 	; 16/10/2014
   489                              <1> 	; 09/10/2014 ; (Retro UNIX 386 v1 - beginning)
   490                              <1> 	;
   491                              <1> 	; INPUT ->
   492                              <1> 	;	EBX = virtual (linear) address
   493                              <1> 	;	ECX = page table attributes (lower 12 bits)
   494                              <1> 	;	      (higher 20 bits must be ZERO)
   495                              <1> 	;	      (bit 0 must be 1)	 
   496                              <1> 	;	u.pgdir = page directory (physical) address
   497                              <1> 	; OUTPUT ->
   498                              <1> 	;	EDX = Page directory entry address
   499                              <1> 	;	EAX = Page table address
   500                              <1> 	;	cf = 1 -> insufficient (out of) memory error
   501                              <1> 	;	cf = 0 -> page table address in the PDE (EDX)
   502                              <1> 	;
   503                              <1> 	; Modified Registers -> EAX, EDX
   504                              <1> 	;
   505 00005C55 E86FFFFFFF          <1> 	call	allocate_page
   506 00005C5A 72F8                <1> 	jc	short mkpt_error
   507 00005C5C E811000000          <1> 	call	set_pde	
   508 00005C61 EBE0                <1> 	jmp	short clear_page
   509                              <1> 
   510                              <1> make_page:
   511                              <1> 	; 24/07/2015
   512                              <1> 	; 23/06/2015 ; (Retro UNIX 386 v1 - beginning)
   513                              <1> 	;
   514                              <1> 	; INPUT ->
   515                              <1> 	;	EBX = virtual (linear) address
   516                              <1> 	;	ECX = page attributes (lower 12 bits)
   517                              <1> 	;	      (higher 20 bits must be ZERO)
   518                              <1> 	;	      (bit 0 must be 1)	 
   519                              <1> 	;	u.pgdir = page directory (physical) address
   520                              <1> 	; OUTPUT ->
   521                              <1> 	;	EBX = Virtual address
   522                              <1> 	;	(EDX = PTE value)
   523                              <1> 	;	EAX = Physical address
   524                              <1> 	;	cf = 1 -> insufficient (out of) memory error
   525                              <1> 	;
   526                              <1> 	; Modified Registers -> EAX, EDX
   527                              <1> 	;
   528 00005C63 E861FFFFFF          <1> 	call	allocate_page
   529 00005C68 7207                <1> 	jc	short mkp_err
   530 00005C6A E821000000          <1> 	call	set_pte	
   531 00005C6F 73D2                <1> 	jnc	short clear_page ; 18/04/2015
   532                              <1> mkp_err:
   533 00005C71 C3                  <1> 	retn
   534                              <1> 
   535                              <1> 
   536                              <1> set_pde:	; Set page directory entry (PDE)
   537                              <1> 	; 20/07/2015
   538                              <1> 	; 18/04/2015
   539                              <1> 	; 12/04/2015
   540                              <1> 	; 23/10/2014
   541                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   542                              <1> 	;
   543                              <1> 	; INPUT ->
   544                              <1> 	;	EAX = physical address
   545                              <1> 	;	      (use present value if EAX = 0)
   546                              <1> 	;	EBX = virtual (linear) address
   547                              <1> 	;	ECX = page table attributes (lower 12 bits)
   548                              <1> 	;	      (higher 20 bits must be ZERO)
   549                              <1> 	;	      (bit 0 must be 1)	 
   550                              <1> 	;	u.pgdir = page directory (physical) address
   551                              <1> 	; OUTPUT ->
   552                              <1> 	;	EDX = PDE address
   553                              <1> 	;	EAX = page table address (physical)
   554                              <1> 	;	;(CF=1 -> Invalid page address)
   555                              <1> 	;
   556                              <1> 	; Modified Registers -> EDX
   557                              <1> 	;
   558 00005C72 89DA                <1> 	mov	edx, ebx
   559 00005C74 C1EA16              <1> 	shr	edx, PAGE_D_SHIFT ; 22
   560 00005C77 C1E202              <1> 	shl	edx, 2 ; offset to page directory (1024*4)
   561 00005C7A 0315[B8030300]      <1> 	add	edx, [u.pgdir]
   562                              <1> 	;
   563 00005C80 21C0                <1> 	and	eax, eax
   564 00005C82 7506                <1> 	jnz	short spde_1
   565                              <1> 	;
   566 00005C84 8B02                <1> 	mov	eax, [edx]  ; old PDE value
   567                              <1> 	;test	al, 1
   568                              <1> 	;jz	short spde_2
   569 00005C86 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h  ; clear lower 12 bits
   570                              <1> spde_1:
   571                              <1> 	;and	cx, 0FFFh
   572 00005C8A 8902                <1> 	mov	[edx], eax
   573 00005C8C 66090A              <1> 	or	[edx], cx
   574 00005C8F C3                  <1> 	retn
   575                              <1> ;spde_2: ; error
   576                              <1> ;	stc
   577                              <1> ;	retn
   578                              <1> 
   579                              <1> set_pte:	; Set page table entry (PTE)
   580                              <1> 	; 24/07/2015
   581                              <1> 	; 20/07/2015
   582                              <1> 	; 23/06/2015
   583                              <1> 	; 18/04/2015
   584                              <1> 	; 12/04/2015
   585                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   586                              <1> 	;
   587                              <1> 	; INPUT ->
   588                              <1> 	;	EAX = physical page address
   589                              <1> 	;	      (use present value if EAX = 0)
   590                              <1> 	;	EBX = virtual (linear) address
   591                              <1> 	;	ECX = page attributes (lower 12 bits)
   592                              <1> 	;	      (higher 20 bits must be ZERO)
   593                              <1> 	;	      (bit 0 must be 1)	 
   594                              <1> 	;	u.pgdir = page directory (physical) address
   595                              <1> 	; OUTPUT ->
   596                              <1> 	;	EAX = physical page address
   597                              <1> 	;	(EDX = PTE value)
   598                              <1> 	;	EBX = virtual address
   599                              <1> 	;
   600                              <1> 	;	CF = 1 -> error
   601                              <1> 	;
   602                              <1> 	; Modified Registers -> EAX, EDX
   603                              <1> 	;
   604 00005C90 50                  <1> 	push	eax
   605 00005C91 A1[B8030300]        <1> 	mov	eax, [u.pgdir] ; 20/07/2015
   606 00005C96 E837000000          <1> 	call 	get_pde
   607                              <1> 		; EDX = PDE address
   608                              <1> 		; EAX = PDE value
   609 00005C9B 5A                  <1> 	pop	edx ; physical page address
   610 00005C9C 722A                <1> 	jc	short spte_err ; PDE not present
   611                              <1> 	;
   612 00005C9E 53                  <1> 	push	ebx ; 24/07/2015
   613 00005C9F 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 bits
   614                              <1> 			    ; EDX = PT address (physical)	
   615 00005CA3 C1EB0C              <1> 	shr	ebx, PAGE_SHIFT ; 12
   616 00005CA6 81E3FF030000        <1> 	and	ebx, PTE_MASK	; 03FFh
   617                              <1> 			 ; clear higher 10 bits (PD bits)
   618 00005CAC C1E302              <1> 	shl	ebx, 2   ; offset to page table (1024*4)
   619 00005CAF 01C3                <1> 	add	ebx, eax
   620                              <1> 	;
   621 00005CB1 8B03                <1> 	mov	eax, [ebx] ; Old PTE value
   622 00005CB3 A801                <1> 	test	al, 1
   623 00005CB5 740C                <1> 	jz	short spte_0
   624 00005CB7 09D2                <1> 	or	edx, edx
   625 00005CB9 750F                <1> 	jnz	short spte_1
   626 00005CBB 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 bits
   627 00005CBF 89C2                <1> 	mov	edx, eax
   628 00005CC1 EB09                <1> 	jmp	short spte_2	
   629                              <1> spte_0:
   630                              <1> 	; If this PTE contains a swap (disk) address,
   631                              <1> 	; it can be updated by using 'swap_in' procedure
   632                              <1> 	; only!
   633 00005CC3 21C0                <1> 	and	eax, eax
   634 00005CC5 7403                <1> 	jz	short spte_1
   635                              <1> 	; 24/07/2015
   636                              <1> 	; swapped page ! (on disk)
   637 00005CC7 5B                  <1> 	pop	ebx
   638                              <1> spte_err:
   639 00005CC8 F9                  <1> 	stc
   640 00005CC9 C3                  <1> 	retn
   641                              <1> spte_1: 
   642 00005CCA 89D0                <1> 	mov	eax, edx
   643                              <1> spte_2:
   644 00005CCC 09CA                <1> 	or	edx, ecx
   645                              <1> 	; 23/06/2015
   646 00005CCE 8913                <1> 	mov	[ebx], edx ; PTE value in EDX
   647                              <1> 	; 24/07/2015
   648 00005CD0 5B                  <1> 	pop	ebx
   649 00005CD1 C3                  <1> 	retn
   650                              <1> 
   651                              <1> get_pde:	; Get present value of the relevant PDE
   652                              <1> 	; 20/07/2015
   653                              <1> 	; 18/04/2015
   654                              <1> 	; 12/04/2015
   655                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   656                              <1> 	;
   657                              <1> 	; INPUT ->
   658                              <1> 	;	EBX = virtual (linear) address
   659                              <1> 	;	EAX = page directory (physical) address
   660                              <1> 	; OUTPUT ->
   661                              <1> 	;	EDX = Page directory entry address
   662                              <1> 	;	EAX = Page directory entry value
   663                              <1> 	;	CF = 1 -> PDE not present or invalid ? 
   664                              <1> 	; Modified Registers -> EDX, EAX
   665                              <1> 	;
   666 00005CD2 89DA                <1> 	mov	edx, ebx
   667 00005CD4 C1EA16              <1> 	shr	edx, PAGE_D_SHIFT ; 22  (12+10)
   668 00005CD7 C1E202              <1> 	shl 	edx, 2 ; offset to page directory (1024*4)
   669 00005CDA 01C2                <1> 	add	edx, eax ; page directory address (physical)
   670 00005CDC 8B02                <1> 	mov	eax, [edx]
   671 00005CDE A801                <1> 	test	al, PDE_A_PRESENT ; page table is present or not !
   672 00005CE0 751F                <1> 	jnz	short gpte_retn
   673 00005CE2 F9                  <1> 	stc
   674                              <1> gpde_retn:	
   675 00005CE3 C3                  <1> 	retn
   676                              <1> 
   677                              <1> get_pte:
   678                              <1> 		; Get present value of the relevant PTE
   679                              <1> 	; 29/07/2015
   680                              <1> 	; 20/07/2015
   681                              <1> 	; 18/04/2015
   682                              <1> 	; 12/04/2015
   683                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   684                              <1> 	;
   685                              <1> 	; INPUT ->
   686                              <1> 	;	EBX = virtual (linear) address
   687                              <1> 	;	EAX = page directory (physical) address
   688                              <1> 	; OUTPUT ->
   689                              <1> 	;	EDX = Page table entry address (if CF=0)
   690                              <1> 	;	      Page directory entry address (if CF=1)
   691                              <1> 	;            (Bit 0 value is 0 if PT is not present)
   692                              <1> 	;	EAX = Page table entry value (page address)
   693                              <1> 	;	CF = 1 -> PDE not present or invalid ? 
   694                              <1> 	; Modified Registers -> EAX, EDX
   695                              <1> 	;
   696 00005CE4 E8E9FFFFFF          <1> 	call 	get_pde
   697 00005CE9 72F8                <1> 	jc	short gpde_retn	; page table is not present
   698                              <1> 	;jnc	short gpte_1
   699                              <1> 	;retn
   700                              <1> ;gpte_1:
   701 00005CEB 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 bits
   702 00005CEF 89DA                <1> 	mov	edx, ebx
   703 00005CF1 C1EA0C              <1> 	shr	edx, PAGE_SHIFT ; 12
   704 00005CF4 81E2FF030000        <1> 	and	edx, PTE_MASK	; 03FFh
   705                              <1> 			 ; clear higher 10 bits (PD bits)
   706 00005CFA C1E202              <1> 	shl	edx, 2 ; offset from start of page table (1024*4)
   707 00005CFD 01C2                <1> 	add	edx, eax
   708 00005CFF 8B02                <1> 	mov	eax, [edx]
   709                              <1> gpte_retn:
   710 00005D01 C3                  <1> 	retn
   711                              <1> 
   712                              <1> deallocate_page_dir:
   713                              <1> 	; 15/09/2015
   714                              <1> 	; 05/08/2015
   715                              <1> 	; 30/04/2015
   716                              <1> 	; 28/04/2015
   717                              <1> 	; 17/10/2014
   718                              <1> 	; 12/10/2014 (Retro UNIX 386 v1 - beginning)
   719                              <1> 	;
   720                              <1> 	; INPUT ->
   721                              <1> 	;	EAX = PHYSICAL ADDRESS OF THE PAGE DIRECTORY (CHILD)
   722                              <1> 	;	EBX = PHYSICAL ADDRESS OF THE PARENT'S PAGE DIRECTORY
   723                              <1> 	; OUTPUT ->
   724                              <1> 	;	All of page tables in the page directory
   725                              <1> 	;	and page dir's itself will be deallocated
   726                              <1> 	;	except 'read only' duplicated pages (will be converted
   727                              <1> 	;	to writable pages).
   728                              <1> 	;
   729                              <1> 	; Modified Registers -> EAX
   730                              <1> 	;
   731                              <1> 	;
   732 00005D02 56                  <1> 	push	esi
   733 00005D03 51                  <1> 	push	ecx
   734 00005D04 50                  <1> 	push	eax
   735 00005D05 89C6                <1> 	mov	esi, eax 
   736 00005D07 31C9                <1> 	xor	ecx, ecx
   737                              <1> 	; The 1st PDE points to Kernel Page Table 0 (the 1st 4MB),
   738                              <1> 	; it must not be deallocated
   739 00005D09 890E                <1> 	mov	[esi], ecx ; 0 ; clear PDE 0
   740                              <1> dapd_0:
   741 00005D0B AD                  <1> 	lodsd
   742 00005D0C A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
   743 00005D0E 7409                <1> 	jz	short dapd_1	
   744 00005D10 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
   745 00005D14 E812000000          <1> 	call	deallocate_page_table			
   746                              <1> dapd_1:
   747 00005D19 41                  <1> 	inc	ecx ; page directory entry index
   748 00005D1A 81F900040000        <1> 	cmp	ecx, PAGE_SIZE / 4 ; 1024
   749 00005D20 72E9                <1> 	jb	short dapd_0
   750                              <1> dapd_2:
   751 00005D22 58                  <1> 	pop	eax
   752 00005D23 E87F000000          <1> 	call	deallocate_page	; deallocate the page dir's itself
   753 00005D28 59                  <1> 	pop	ecx
   754 00005D29 5E                  <1> 	pop	esi
   755 00005D2A C3                  <1> 	retn
   756                              <1> 
   757                              <1> deallocate_page_table:
   758                              <1> 	; 12/07/2016
   759                              <1> 	; 19/09/2015
   760                              <1> 	; 15/09/2015
   761                              <1> 	; 05/08/2015
   762                              <1> 	; 30/04/2015
   763                              <1> 	; 28/04/2015
   764                              <1> 	; 24/10/2014
   765                              <1> 	; 23/10/2014
   766                              <1> 	; 12/10/2014 (Retro UNIX 386 v1 - beginning)
   767                              <1> 	;
   768                              <1> 	; INPUT ->
   769                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE PAGE TABLE
   770                              <1> 	;	EBX = PHYSICAL ADDRESS OF THE PARENT'S PAGE DIRECTORY
   771                              <1> 	;	(ECX = page directory entry index)
   772                              <1> 	; OUTPUT ->
   773                              <1> 	;	All of pages in the page table and page table's itself
   774                              <1> 	;	will be deallocated except 'read only' duplicated pages
   775                              <1> 	;	(will be converted to writable pages).
   776                              <1> 	;
   777                              <1> 	; Modified Registers -> EAX
   778                              <1> 	;
   779 00005D2B 56                  <1> 	push	esi
   780 00005D2C 57                  <1> 	push	edi
   781 00005D2D 52                  <1> 	push	edx
   782 00005D2E 50                  <1> 	push	eax ; *
   783 00005D2F 89C6                <1> 	mov	esi, eax 
   784 00005D31 31FF                <1> 	xor	edi, edi ; 0
   785                              <1> dapt_0:
   786 00005D33 AD                  <1> 	lodsd
   787 00005D34 A801                <1> 	test	al, PTE_A_PRESENT ; bit 0, present flag (must be 1)
   788 00005D36 7441                <1> 	jz	short dapt_1
   789                              <1> 	;
   790 00005D38 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
   791                              <1> 				  ; (must be 1)
   792 00005D3A 754C                <1> 	jnz	short dapt_3
   793                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
   794 00005D3C 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
   795                              <1> 				   ; as child's page ?
   796 00005D40 7451                <1> 	jz	short dapt_4 ; Clear PTE but don't deallocate the page!
   797                              <1> 	; check the parent's PTE value is read only & same page or not.. 
   798                              <1> 	; ECX = page directory entry index (0-1023)
   799 00005D42 53                  <1> 	push	ebx
   800 00005D43 51                  <1> 	push	ecx
   801 00005D44 66C1E102            <1> 	shl	cx, 2 ; *4 
   802 00005D48 01CB                <1> 	add	ebx, ecx ; PDE offset (for the parent)
   803 00005D4A 8B0B                <1> 	mov	ecx, [ebx]
   804 00005D4C F6C101              <1> 	test	cl, PDE_A_PRESENT ; present (valid) or not ?
   805 00005D4F 7435                <1> 	jz	short dapt_2	; parent process does not use this page
   806 00005D51 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
   807                              <1> 	; EDI = page table entry index (0-1023)
   808 00005D56 89FA                <1> 	mov	edx, edi 
   809 00005D58 66C1E202            <1> 	shl	dx, 2 ; *4 
   810 00005D5C 01CA                <1> 	add	edx, ecx ; PTE offset (for the parent)
   811 00005D5E 8B1A                <1> 	mov	ebx, [edx]
   812 00005D60 F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
   813 00005D63 7421                <1> 	jz	short dapt_2	; parent process does not use this page
   814 00005D65 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
   815 00005D69 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
   816 00005D6E 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
   817 00005D70 7514                <1> 	jne	short dapt_2	; not same page
   818                              <1> 				; deallocate the child's page
   819 00005D72 800A02              <1>         or      byte [edx], PTE_A_WRITE ; convert to writable page (parent)
   820 00005D75 59                  <1> 	pop	ecx
   821 00005D76 5B                  <1> 	pop	ebx
   822 00005D77 EB1A                <1> 	jmp	short dapt_4
   823                              <1> dapt_1:
   824 00005D79 09C0                <1> 	or	eax, eax	; swapped page ?
   825 00005D7B 741D                <1> 	jz	short dapt_5	; no
   826                              <1> 				; yes
   827 00005D7D D1E8                <1> 	shr	eax, 1
   828 00005D7F E8CA040000          <1> 	call	unlink_swap_block ; Deallocate swapped page block
   829                              <1> 				  ; on the swap disk (or in file)
   830 00005D84 EB14                <1> 	jmp	short dapt_5
   831                              <1> dapt_2:
   832 00005D86 59                  <1> 	pop	ecx
   833 00005D87 5B                  <1> 	pop	ebx
   834                              <1> dapt_3:	
   835                              <1> 	; 12/07/2016
   836 00005D88 66A90004            <1> 	test	ax, PTE_SHARED ; shared or direct memory access indicator
   837 00005D8C 7505                <1> 	jnz	short dapt_4   ; AVL bit 1 = 1, do not deallocate this page!
   838                              <1> 	;
   839                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
   840 00005D8E E814000000          <1> 	call	deallocate_page ; set the mem allocation bit of this page
   841                              <1> dapt_4:
   842 00005D93 C746FC00000000      <1> 	mov	dword [esi-4], 0 ; clear/reset PTE (child, dupl. as parent)
   843                              <1> dapt_5:
   844 00005D9A 47                  <1> 	inc	edi ; page table entry index
   845 00005D9B 81FF00040000        <1> 	cmp	edi, PAGE_SIZE / 4 ; 1024
   846 00005DA1 7290                <1> 	jb	short dapt_0
   847                              <1> 	;
   848 00005DA3 58                  <1> 	pop	eax ; *
   849 00005DA4 5A                  <1> 	pop	edx
   850 00005DA5 5F                  <1> 	pop	edi	
   851 00005DA6 5E                  <1> 	pop	esi
   852                              <1> 	;
   853                              <1> 	;call	deallocate_page	; deallocate the page table's itself
   854                              <1> 	;retn
   855                              <1> 
   856                              <1> deallocate_page:
   857                              <1> 	; 15/09/2015
   858                              <1> 	; 28/04/2015
   859                              <1> 	; 10/03/2015
   860                              <1> 	; 17/10/2014
   861                              <1> 	; 12/10/2014 (Retro UNIX 386 v1 - beginning)
   862                              <1> 	;
   863                              <1> 	; INPUT -> 
   864                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE ALLOCATED PAGE
   865                              <1> 	; OUTPUT ->
   866                              <1> 	;	[free_pages] is increased
   867                              <1> 	;	(corresponding MEMORY ALLOCATION TABLE bit is SET)
   868                              <1> 	;	CF = 1 if the page is already deallocated
   869                              <1> 	; 	       (or not allocated) before.  
   870                              <1> 	;
   871                              <1> 	; Modified Registers -> EAX
   872                              <1> 	;
   873 00005DA7 53                  <1> 	push	ebx
   874 00005DA8 52                  <1> 	push	edx
   875                              <1> 	;
   876 00005DA9 C1E80C              <1> 	shr	eax, PAGE_SHIFT      ; shift physical address to 
   877                              <1> 				     ; 12 bits right
   878                              <1> 				     ; to get page number
   879 00005DAC 89C2                <1> 	mov	edx, eax
   880                              <1> 	; 15/09/2015
   881 00005DAE C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
   882                              <1> 				     ; (1 allocation bit = 1 page)
   883                              <1> 				     ; (1 allocation bytes = 8 pages)
   884 00005DB1 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
   885                              <1> 				     ; (to get 32 bit position)			
   886                              <1> 	;
   887 00005DB4 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table address
   888 00005DB9 01D3                <1> 	add	ebx, edx
   889 00005DBB 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only
   890                              <1> 				     ; (allocation bit position)	 
   891 00005DBE 3B15[9C810100]      <1> 	cmp 	edx, [next_page]     ; is the new free page address lower
   892                              <1> 				     ; than the address in 'next_page' ?
   893                              <1> 				     ; (next/first free page value)		
   894 00005DC4 7306                <1> 	jnb	short dap_1	     ; no	
   895 00005DC6 8915[9C810100]      <1> 	mov	[next_page], edx     ; yes
   896                              <1> dap_1:
   897 00005DCC 0FAB03              <1> 	bts	[ebx], eax	     ; unlink/release/deallocate page
   898                              <1> 				     ; set relevant bit to 1.
   899                              <1> 				     ; set CF to the previous bit value	
   900                              <1> 	;cmc			     ; complement carry flag	
   901                              <1> 	;jc	short dap_2	     ; do not increase free_pages count
   902                              <1> 				     ; if the page is already deallocated
   903                              <1> 				     ; before.	
   904 00005DCF FF05[98810100]      <1>         inc     dword [free_pages]
   905                              <1> dap_2:
   906 00005DD5 5A                  <1> 	pop	edx
   907 00005DD6 5B                  <1> 	pop	ebx
   908 00005DD7 C3                  <1> 	retn
   909                              <1> 
   910                              <1> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   911                              <1> ;;                                                              ;;
   912                              <1> ;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;
   913                              <1> ;; Distributed under terms of the GNU General Public License    ;;
   914                              <1> ;;                                                              ;;
   915                              <1> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   916                              <1> 
   917                              <1> ;;$Revision: 5057 $
   918                              <1> 
   919                              <1> 
   920                              <1> ;;align 4
   921                              <1> ;;proc alloc_page
   922                              <1> 
   923                              <1> ;;        pushfd
   924                              <1> ;;        cli
   925                              <1> ;;        push    ebx
   926                              <1> ;;;//-
   927                              <1> ;;        cmp     [pg_data.pages_free], 1
   928                              <1> ;;        jle     .out_of_memory
   929                              <1> ;;;//-
   930                              <1> ;;
   931                              <1> ;;        mov     ebx, [page_start]
   932                              <1> ;;        mov     ecx, [page_end]
   933                              <1> ;;.l1:
   934                              <1> ;;        bsf     eax, [ebx];
   935                              <1> ;;        jnz     .found
   936                              <1> ;;        add     ebx, 4
   937                              <1> ;;        cmp     ebx, ecx
   938                              <1> ;;        jb      .l1
   939                              <1> ;;        pop     ebx
   940                              <1> ;;        popfd
   941                              <1> ;;        xor     eax, eax
   942                              <1> ;;        ret
   943                              <1> ;;.found:
   944                              <1> ;;;//-
   945                              <1> ;;        dec     [pg_data.pages_free]
   946                              <1> ;;        jz      .out_of_memory
   947                              <1> ;;;//-
   948                              <1> ;;        btr     [ebx], eax
   949                              <1> ;;        mov     [page_start], ebx
   950                              <1> ;;        sub     ebx, sys_pgmap
   951                              <1> ;;        lea     eax, [eax+ebx*8]
   952                              <1> ;;        shl     eax, 12
   953                              <1> ;;;//-       dec [pg_data.pages_free]
   954                              <1> ;;        pop     ebx
   955                              <1> ;;        popfd
   956                              <1> ;;        ret
   957                              <1> ;;;//-
   958                              <1> ;;.out_of_memory:
   959                              <1> ;;        mov     [pg_data.pages_free], 1
   960                              <1> ;;        xor     eax, eax
   961                              <1> ;;        pop     ebx
   962                              <1> ;;        popfd
   963                              <1> ;;        ret
   964                              <1> ;;;//-
   965                              <1> ;;endp
   966                              <1> 
   967                              <1> duplicate_page_dir:
   968                              <1> 	; 21/09/2015
   969                              <1> 	; 31/08/2015
   970                              <1> 	; 20/07/2015
   971                              <1> 	; 28/04/2015
   972                              <1> 	; 27/04/2015
   973                              <1> 	; 18/04/2015
   974                              <1> 	; 12/04/2015
   975                              <1> 	; 18/10/2014
   976                              <1> 	; 16/10/2014 (Retro UNIX 386 v1 - beginning)
   977                              <1> 	;
   978                              <1> 	; INPUT -> 
   979                              <1> 	;	[u.pgdir] = PHYSICAL (real/flat) ADDRESS of the parent's
   980                              <1> 	;		    page directory.
   981                              <1> 	; OUTPUT ->
   982                              <1> 	;	EAX =  PHYSICAL (real/flat) ADDRESS of the child's
   983                              <1> 	;	       page directory.
   984                              <1> 	;	(New page directory with new page table entries.)
   985                              <1> 	;	(New page tables with read only copies of the parent's
   986                              <1> 	;	pages.)
   987                              <1> 	;	EAX = 0 -> Error (CF = 1)
   988                              <1> 	;
   989                              <1> 	; Modified Registers -> none (except EAX)
   990                              <1> 	;
   991 00005DD8 E8ECFDFFFF          <1> 	call	allocate_page
   992 00005DDD 723E                <1> 	jc	short dpd_err
   993                              <1> 	;
   994 00005DDF 55                  <1> 	push	ebp ; 20/07/2015
   995 00005DE0 56                  <1> 	push	esi
   996 00005DE1 57                  <1> 	push	edi
   997 00005DE2 53                  <1> 	push	ebx
   998 00005DE3 51                  <1> 	push	ecx
   999 00005DE4 8B35[B8030300]      <1> 	mov	esi, [u.pgdir]
  1000 00005DEA 89C7                <1> 	mov	edi, eax
  1001 00005DEC 50                  <1> 	push	eax ; save child's page directory address
  1002                              <1> 	; 31/08/2015
  1003                              <1> 	; copy PDE 0 from the parent's page dir to the child's page dir
  1004                              <1> 	; (use same system space for all user page tables) 
  1005 00005DED A5                  <1> 	movsd
  1006 00005DEE BD00004000          <1> 	mov	ebp, 1024*4096 ; pass the 1st 4MB (system space)
  1007 00005DF3 B9FF030000          <1> 	mov	ecx, (PAGE_SIZE / 4) - 1 ; 1023
  1008                              <1> dpd_0:	
  1009 00005DF8 AD                  <1> 	lodsd
  1010                              <1> 	;or	eax, eax
  1011                              <1>         ;jnz     short dpd_1
  1012 00005DF9 A801                <1> 	test	al, PDE_A_PRESENT ;  bit 0 =  1
  1013 00005DFB 7508                <1> 	jnz	short dpd_1
  1014                              <1>  	; 20/07/2015 (virtual address at the end of the page table)	
  1015 00005DFD 81C500004000        <1> 	add	ebp, 1024*4096 ; page size * PTE count
  1016 00005E03 EB0F                <1> 	jmp	short dpd_2
  1017                              <1> dpd_1:	
  1018 00005E05 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear attribute bits
  1019 00005E09 89C3                <1> 	mov	ebx, eax
  1020                              <1> 	; EBX = Parent's page table address
  1021 00005E0B E81F000000          <1> 	call	duplicate_page_table
  1022 00005E10 720C                <1> 	jc	short dpd_p_err
  1023                              <1> 	; EAX = Child's page table address
  1024 00005E12 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER
  1025                              <1> 			 ; set bit 0, bit 1 and bit 2 to 1
  1026                              <1> 			 ; (present, writable, user)
  1027                              <1> dpd_2:
  1028 00005E14 AB                  <1> 	stosd
  1029 00005E15 E2E1                <1> 	loop	dpd_0
  1030                              <1> 	;
  1031 00005E17 58                  <1> 	pop	eax  ; restore child's page directory address
  1032                              <1> dpd_3:
  1033 00005E18 59                  <1> 	pop	ecx
  1034 00005E19 5B                  <1> 	pop	ebx
  1035 00005E1A 5F                  <1> 	pop	edi
  1036 00005E1B 5E                  <1> 	pop	esi
  1037 00005E1C 5D                  <1> 	pop	ebp ; 20/07/2015
  1038                              <1> dpd_err:
  1039 00005E1D C3                  <1> 	retn
  1040                              <1> dpd_p_err:
  1041                              <1> 	; release the allocated pages missing (recover free space)
  1042 00005E1E 58                  <1> 	pop	eax  ; the new page directory address (physical)
  1043 00005E1F 8B1D[B8030300]      <1> 	mov	ebx, [u.pgdir] ; parent's page directory address 
  1044 00005E25 E8D8FEFFFF          <1> 	call 	deallocate_page_dir
  1045 00005E2A 29C0                <1> 	sub	eax, eax ; 0
  1046 00005E2C F9                  <1> 	stc
  1047 00005E2D EBE9                <1> 	jmp	short dpd_3	
  1048                              <1> 
  1049                              <1> duplicate_page_table:
  1050                              <1> 	; 20/02/2017
  1051                              <1> 	; 21/09/2015
  1052                              <1> 	; 20/07/2015
  1053                              <1> 	; 05/05/2015
  1054                              <1> 	; 28/04/2015
  1055                              <1> 	; 27/04/2015
  1056                              <1> 	; 18/04/2015
  1057                              <1> 	; 18/10/2014
  1058                              <1> 	; 16/10/2014 (Retro UNIX 386 v1 - beginning)
  1059                              <1> 	;
  1060                              <1> 	; INPUT -> 
  1061                              <1> 	;	EBX = PHYSICAL (real/flat) ADDRESS of the parent's page table.
  1062                              <1> 	;       20/02/2017		 
  1063                              <1> 	;	EBP = Linear address of the page (from 'duplicate_page_dir')
  1064                              <1> 	;	      (Linear address = CORE + user's virtual address) 	
  1065                              <1> 	; OUTPUT ->
  1066                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS of the child's page table.
  1067                              <1> 	;	      (with 'read only' attribute of page table entries)
  1068                              <1> 	;	20/02/2017
  1069                              <1> 	;	EBP = Next linear page address (for 'duplicate_page_dir')
  1070                              <1> 	;	
  1071                              <1> 	;	CF = 1 -> error 
  1072                              <1> 	;
  1073                              <1> 	; Modified Registers -> EBP (except EAX)
  1074                              <1> 	;
  1075 00005E2F E895FDFFFF          <1> 	call	allocate_page
  1076 00005E34 726A                <1> 	jc	short dpt_err
  1077                              <1> 	;
  1078 00005E36 50                  <1> 	push	eax ; *
  1079 00005E37 56                  <1> 	push	esi
  1080 00005E38 57                  <1> 	push	edi
  1081 00005E39 52                  <1> 	push	edx
  1082 00005E3A 51                  <1> 	push	ecx
  1083                              <1> 	;
  1084 00005E3B 89DE                <1> 	mov	esi, ebx
  1085 00005E3D 89C7                <1> 	mov	edi, eax
  1086 00005E3F 89C2                <1> 	mov	edx, eax
  1087 00005E41 81C200100000        <1> 	add	edx, PAGE_SIZE 	
  1088                              <1> dpt_0:
  1089 00005E47 AD                  <1> 	lodsd
  1090 00005E48 21C0                <1> 	and	eax, eax
  1091 00005E4A 7444                <1> 	jz	short dpt_3
  1092 00005E4C A801                <1> 	test	al, PTE_A_PRESENT ;  bit 0 =  1
  1093 00005E4E 7507                <1> 	jnz	short dpt_1
  1094                              <1> 	; 20/07/2015
  1095                              <1> 	; ebp = virtual (linear) address of the memory page
  1096 00005E50 E83F050000          <1> 	call	reload_page ; 28/04/2015
  1097 00005E55 7244                <1> 	jc	short dpt_p_err
  1098                              <1> dpt_1:
  1099                              <1> 	; 21/09/2015
  1100 00005E57 89C1                <1> 	mov	ecx, eax
  1101 00005E59 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  1102 00005E5D F6C102              <1> 	test	cl, PTE_A_WRITE ; writable page ?
  1103 00005E60 7525                <1> 	jnz	short dpt_2
  1104                              <1> 	; Read only (parent) page
  1105                              <1> 	; 	- there is a third process which uses this page -
  1106                              <1> 	; Allocate a new page for the child process
  1107 00005E62 E862FDFFFF          <1> 	call	allocate_page
  1108 00005E67 7232                <1> 	jc	short dpt_p_err
  1109 00005E69 57                  <1> 	push	edi
  1110 00005E6A 56                  <1> 	push	esi
  1111 00005E6B 89CE                <1> 	mov	esi, ecx
  1112 00005E6D 89C7                <1> 	mov	edi, eax
  1113 00005E6F B900040000          <1> 	mov	ecx, PAGE_SIZE/4
  1114 00005E74 F3A5                <1> 	rep	movsd	; copy page (4096 bytes)
  1115 00005E76 5E                  <1> 	pop	esi
  1116 00005E77 5F                  <1> 	pop	edi
  1117                              <1> 	; 
  1118 00005E78 53                  <1> 	push	ebx
  1119 00005E79 50                  <1> 	push	eax
  1120                              <1> 	; 20/07/2015
  1121 00005E7A 89EB                <1> 	mov	ebx, ebp
  1122                              <1> 	; ebx = virtual (linear) address of the memory page
  1123 00005E7C E887030000          <1> 	call	add_to_swap_queue
  1124 00005E81 58                  <1> 	pop	eax
  1125 00005E82 5B                  <1> 	pop	ebx
  1126                              <1> 	; 21/09/2015
  1127 00005E83 0C07                <1> 	or	al, PTE_A_USER+PTE_A_WRITE+PTE_A_PRESENT 
  1128                              <1> 		; user + writable + present page
  1129 00005E85 EB09                <1> 	jmp	short dpt_3
  1130                              <1> dpt_2:
  1131                              <1> 	;or	ax, PTE_A_USER+PTE_A_PRESENT 
  1132 00005E87 0C05                <1> 	or	al, PTE_A_USER+PTE_A_PRESENT 
  1133                              <1> 		    ; (read only page!)
  1134 00005E89 8946FC              <1> 	mov	[esi-4], eax ; update parent's PTE
  1135 00005E8C 660D0002            <1> 	or      ax, PTE_DUPLICATED  ; (read only page & duplicated PTE!)
  1136                              <1> dpt_3:
  1137 00005E90 AB                  <1> 	stosd  ; EDI points to child's PTE  	 
  1138                              <1> 	;
  1139 00005E91 81C500100000        <1> 	add	ebp, 4096 ; 20/07/2015 (next page)
  1140                              <1> 	;
  1141 00005E97 39D7                <1> 	cmp	edi, edx
  1142 00005E99 72AC                <1> 	jb	short dpt_0
  1143                              <1> dpt_p_err:
  1144 00005E9B 59                  <1> 	pop	ecx
  1145 00005E9C 5A                  <1> 	pop	edx
  1146 00005E9D 5F                  <1> 	pop	edi
  1147 00005E9E 5E                  <1> 	pop	esi
  1148 00005E9F 58                  <1> 	pop	eax ; *
  1149                              <1> dpt_err:
  1150 00005EA0 C3                  <1> 	retn
  1151                              <1> 
  1152                              <1> page_fault_handler:	; CPU EXCEPTION 0Eh (14) : Page Fault !
  1153                              <1> 	; 21/09/2015
  1154                              <1> 	; 19/09/2015
  1155                              <1> 	; 17/09/2015
  1156                              <1> 	; 28/08/2015
  1157                              <1> 	; 20/07/2015
  1158                              <1> 	; 28/06/2015
  1159                              <1> 	; 03/05/2015
  1160                              <1> 	; 30/04/2015
  1161                              <1> 	; 18/04/2015
  1162                              <1> 	; 12/04/2015
  1163                              <1> 	; 30/10/2014
  1164                              <1> 	; 11/09/2014
  1165                              <1> 	; 10/09/2014 (Retro UNIX 386 v1 - beginning)
  1166                              <1> 	;
  1167                              <1> 	; Note: This is not an interrupt/exception handler.
  1168                              <1> 	;	This is a 'page fault remedy' subroutine 
  1169                              <1> 	;	which will be called by standard/uniform
  1170                              <1> 	;	exception handler.
  1171                              <1> 	;
  1172                              <1> 	; INPUT -> 
  1173                              <1> 	;	[error_code] = 32 bit ERROR CODE (lower 5 bits are valid)
  1174                              <1> 	;
  1175                              <1> 	;	cr2 = the virtual (linear) address 
  1176                              <1> 	;	      which has caused to page fault (19/09/2015)
  1177                              <1> 	;
  1178                              <1> 	; OUTPUT ->
  1179                              <1> 	;	(corresponding PAGE TABLE ENTRY is mapped/set)
  1180                              <1> 	;	EAX = 0 -> no error
  1181                              <1> 	;	EAX > 0 -> error code in EAX (also CF = 1)
  1182                              <1> 	;
  1183                              <1> 	; Modified Registers -> none (except EAX)
  1184                              <1> 	;	
  1185                              <1>         ;
  1186                              <1>         ; ERROR CODE:
  1187                              <1> 	;	 31  .....	4   3	2   1	0
  1188                              <1> 	;	+---+-- --+---+---+---+---+---+---+
  1189                              <1> 	;	|   Reserved  | I | R | U | W | P |
  1190                              <1> 	;	+---+-- --+---+---+---+---+---+---+
  1191                              <1> 	;
  1192                              <1> 	; P : PRESENT -	When set, the page fault was caused by 
  1193                              <1>     	;		a page-protection violation. When not set,
  1194                              <1> 	;		it was caused by a non-present page.
  1195                              <1> 	; W : WRITE   -	When set, the page fault was caused by
  1196                              <1> 	;		a page write. When not set, it was caused
  1197                              <1> 	;		by a page read.
  1198                              <1> 	; U : USER    -	When set, the page fault was caused 
  1199                              <1> 	;		while CPL = 3. 
  1200                              <1> 	;		This does not necessarily mean that
  1201                              <1> 	;		the page fault was a privilege violation.
  1202                              <1> 	; R : RESERVD -	When set, the page fault was caused by
  1203                              <1> 	;     WRITE	reading a 1 in a reserved field.
  1204                              <1> 	; I : INSTRUC -	When set, the page fault was caused by
  1205                              <1> 	;     FETCH	an instruction fetch
  1206                              <1> 	;
  1207                              <1> 	;; x86 (32 bit) VIRTUAL ADDRESS TRANSLATION
  1208                              <1> 	;  31               22                  12 11                    0
  1209                              <1> 	; +-------------------+-------------------+-----------------------+
  1210                              <1>        	; | PAGE DIR. ENTRY # | PAGE TAB. ENTRY # |        OFFSET         |
  1211                              <1>        	; +-------------------+-------------------+-----------------------+
  1212                              <1> 	;
  1213                              <1> 
  1214                              <1> 	;; CR3 REGISTER (Control Register 3)
  1215                              <1> 	;  31                                   12             5 4 3 2   0
  1216                              <1> 	; +---------------------------------------+-------------+---+-----+
  1217                              <1>       	; |                                       |  		|P|P|     |
  1218                              <1>       	; |   PAGE DIRECTORY TABLE BASE ADDRESS   |  reserved	|C|W|rsvrd|
  1219                              <1>       	; |                                       | 		|D|T|     |
  1220                              <1>    	; +---------------------------------------+-------------+---+-----+
  1221                              <1> 	;
  1222                              <1> 	;	PWT    - WRITE THROUGH
  1223                              <1> 	;	PCD    - CACHE DISABLE		
  1224                              <1> 	;
  1225                              <1> 	;
  1226                              <1> 	;; x86 PAGE DIRECTORY ENTRY (4 KByte Page)
  1227                              <1> 	;  31                                   12 11  9 8 7 6 5 4 3 2 1 0
  1228                              <1> 	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1229                              <1>       	; |                                       |     | | | | |P|P|U|R| |
  1230                              <1>       	; |     PAGE TABLE BASE ADDRESS 31..12    | AVL |G|0|D|A|C|W|/|/|P|
  1231                              <1>       	; |                                       |     | | | | |D|T|S|W| |
  1232                              <1>    	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1233                              <1> 	;
  1234                              <1>         ;       P      - PRESENT
  1235                              <1>         ;       R/W    - READ/WRITE
  1236                              <1>         ;       U/S    - USER/SUPERVISOR
  1237                              <1> 	;	PWT    - WRITE THROUGH
  1238                              <1> 	;	PCD    - CACHE DISABLE	
  1239                              <1> 	;	A      - ACCESSED	
  1240                              <1>         ;       D      - DIRTY (IGNORED)
  1241                              <1> 	;	PAT    - PAGE ATTRIBUTE TABLE INDEX (CACHE BEHAVIOR)
  1242                              <1> 	;	G      - GLOBAL	(IGNORED) 
  1243                              <1>         ;       AVL    - AVAILABLE FOR SYSTEMS PROGRAMMER USE
  1244                              <1> 	;
  1245                              <1> 	;
  1246                              <1> 	;; x86 PAGE TABLE ENTRY (4 KByte Page)
  1247                              <1> 	;  31                                   12 11  9 8 7 6 5 4 3 2 1 0
  1248                              <1> 	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1249                              <1>       	; |                                       |     | |P| | |P|P|U|R| |
  1250                              <1>       	; |     PAGE FRAME BASE ADDRESS 31..12    | AVL |G|A|D|A|C|W|/|/|P|
  1251                              <1>       	; |                                       |     | |T| | |D|T|S|W| |
  1252                              <1>    	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1253                              <1> 	;
  1254                              <1>         ;       P      - PRESENT
  1255                              <1>         ;       R/W    - READ/WRITE
  1256                              <1>         ;       U/S    - USER/SUPERVISOR
  1257                              <1> 	;	PWT    - WRITE THROUGH
  1258                              <1> 	;	PCD    - CACHE DISABLE	
  1259                              <1> 	;	A      - ACCESSED	
  1260                              <1>         ;       D      - DIRTY
  1261                              <1> 	;	PAT    - PAGE ATTRIBUTE TABLE INDEX (CACHE BEHAVIOR)
  1262                              <1> 	;	G      - GLOBAL	 
  1263                              <1>         ;       AVL    - AVAILABLE FOR SYSTEMS PROGRAMMER USE
  1264                              <1> 	;
  1265                              <1> 	;
  1266                              <1> 	;; 80386 PAGE TABLE ENTRY (4 KByte Page)
  1267                              <1> 	;  31                                   12 11  9 8 7 6 5 4 3 2 1 0
  1268                              <1> 	; +---------------------------------------+-----+-+-+-+-+---+-+-+-+
  1269                              <1>       	; |                                       |     | | | | | | |U|R| |
  1270                              <1>       	; |     PAGE FRAME BASE ADDRESS 31..12    | AVL |0|0|D|A|0|0|/|/|P|
  1271                              <1>       	; |                                       |     | | | | | | |S|W| |
  1272                              <1>       	; +---------------------------------------+-----+-+-+-+-+---+-+-+-+
  1273                              <1> 	;
  1274                              <1>         ;       P      - PRESENT
  1275                              <1>         ;       R/W    - READ/WRITE
  1276                              <1>         ;       U/S    - USER/SUPERVISOR
  1277                              <1>         ;       D      - DIRTY
  1278                              <1>         ;       AVL    - AVAILABLE FOR SYSTEMS PROGRAMMER USE
  1279                              <1> 	;
  1280                              <1>         ;       NOTE: 0 INDICATES INTEL RESERVED. DO NOT DEFINE.
  1281                              <1> 	;
  1282                              <1> 	;
  1283                              <1> 	;; Invalid Page Table Entry
  1284                              <1> 	; 31                                                           1 0
  1285                              <1>       	; +-------------------------------------------------------------+-+
  1286                              <1>       	; |                                                             | |
  1287                              <1>       	; |                          AVAILABLE                          |0|
  1288                              <1>       	; |                                                             | |
  1289                              <1>       	; +-------------------------------------------------------------+-+
  1290                              <1> 	;
  1291                              <1> 
  1292 00005EA1 53                  <1> 	push	ebx
  1293 00005EA2 52                  <1> 	push	edx
  1294 00005EA3 51                  <1> 	push	ecx
  1295                              <1> 	;
  1296                              <1> 	; 21/09/2015 (debugging)
  1297 00005EA4 FF05[CC030300]      <1> 	inc	dword [u.pfcount] ; page fault count for running process
  1298 00005EAA FF05[80050300]      <1> 	inc	dword [PF_Count] ; total page fault count	
  1299                              <1> 	; 28/06/2015
  1300                              <1> 	;mov	edx, [error_code] ; Lower 5 bits are valid
  1301 00005EB0 8A15[78050300]      <1> 	mov	dl, [error_code]
  1302                              <1> 	;
  1303 00005EB6 F6C201              <1> 	test	dl, 1	; page fault was caused by a non-present page
  1304                              <1> 			; sign
  1305 00005EB9 7422                <1> 	jz	short pfh_alloc_np
  1306                              <1> 	; 
  1307                              <1> 	; If it is not a 'write on read only page' type page fault
  1308                              <1> 	; major page fault error with minor reason must be returned without 
  1309                              <1> 	; fixing the problem. 'sys_exit with error' will be needed
  1310                              <1> 	; after return here!
  1311                              <1> 	; Page fault will be remedied, by copying page contents
  1312                              <1> 	; to newly allocated page with write permission;
  1313                              <1> 	; sys_fork -> sys_exec -> copy on write, demand paging method is 
  1314                              <1> 	; used for working with minimum possible memory usage. 
  1315                              <1> 	; sys_fork will duplicate page directory and tables of parent  
  1316                              <1> 	; process with 'read only' flag. If the child process attempts to
  1317                              <1> 	; write on these read only pages, page fault will be directed here
  1318                              <1> 	; for allocating a new page with same data/content. 
  1319                              <1> 	;
  1320                              <1> 	; IMPORTANT : Retro UNIX 386 v1 (and SINGLIX and TR-DOS)
  1321                              <1> 	; will not force to separate CODE and DATA space 
  1322                              <1> 	; in a process/program... 
  1323                              <1> 	; CODE segment/section may contain DATA!
  1324                              <1> 	; It is flat, smoth and simplest programming method already as in 
  1325                              <1> 	; Retro UNIX 8086 v1 and MS-DOS programs.
  1326                              <1> 	;	
  1327 00005EBB F6C202              <1> 	test	dl, 2	; page fault was caused by a page write
  1328                              <1> 			; sign
  1329 00005EBE 0F84AB000000        <1>         jz      pfh_p_err
  1330                              <1> 	; 31/08/2015
  1331 00005EC4 F6C204              <1> 	test	dl, 4	; page fault was caused while CPL = 3 (user mode)
  1332                              <1> 			; sign.  (U+W+P = 4+2+1 = 7)
  1333 00005EC7 0F84A2000000        <1>         jz	pfh_pv_err
  1334                              <1> 	;
  1335                              <1> 	; make a new page and copy the parent's page content
  1336                              <1> 	; as the child's new page content
  1337                              <1> 	;
  1338 00005ECD 0F20D3              <1> 	mov	ebx, cr2 ; CR2 contains the linear address 
  1339                              <1> 			 ; which has caused to page fault
  1340 00005ED0 E8A2000000          <1> 	call 	copy_page
  1341 00005ED5 0F828D000000        <1>         jc      pfh_im_err ; insufficient memory
  1342                              <1> 	;
  1343 00005EDB EB7D                <1>         jmp     pfh_cpp_ok
  1344                              <1> 	;
  1345                              <1> pfh_alloc_np:
  1346 00005EDD E8E7FCFFFF          <1> 	call	allocate_page	; (allocate a new page)
  1347 00005EE2 0F8280000000        <1>         jc      pfh_im_err	; 'insufficient memory' error
  1348                              <1> pfh_chk_cpl:
  1349                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  1350                              <1> 		; (Lower 12 bits are ZERO, because 
  1351                              <1> 		;	the address is on a page boundary)
  1352 00005EE8 80E204              <1> 	and	dl, 4	; CPL = 3 ?
  1353 00005EEB 7505                <1> 	jnz	short pfh_um
  1354                              <1> 			; Page fault handler for kernel/system mode (CPL=0)		
  1355 00005EED 0F20DB              <1> 	mov	ebx, cr3 ; CR3 (Control Register 3) contains physical address
  1356                              <1> 			 ; of the current/active page directory
  1357                              <1> 			 ; (Always kernel/system mode page directory, here!)
  1358                              <1> 			 ; Note: Lower 12 bits are 0. (page boundary)
  1359 00005EF0 EB06                <1> 	jmp	short pfh_get_pde
  1360                              <1> 	;
  1361                              <1> pfh_um:			; Page fault handler for user/appl. mode (CPL=3)
  1362 00005EF2 8B1D[B8030300]      <1>  	mov	ebx, [u.pgdir] ; Page directory of current/active process
  1363                              <1> 			; Physical address of the USER's page directory
  1364                              <1> 			; Note: Lower 12 bits are 0. (page boundary)
  1365                              <1> pfh_get_pde:
  1366 00005EF8 80CA03              <1> 	or	dl, 3	; USER + WRITE + PRESENT or SYSTEM + WRITE + PRESENT
  1367 00005EFB 0F20D1              <1> 	mov	ecx, cr2 ; CR2 contains the virtual address 
  1368                              <1> 			 ; which has been caused to page fault
  1369                              <1> 			 ;
  1370 00005EFE C1E914              <1> 	shr	ecx, 20	 ; shift 20 bits right
  1371 00005F01 80E1FC              <1> 	and	cl, 0FCh ; mask lower 2 bits to get PDE offset		
  1372                              <1> 	;
  1373 00005F04 01CB                <1> 	add	ebx, ecx ; now, EBX points to the relevant page dir entry 
  1374 00005F06 8B0B                <1> 	mov	ecx, [ebx] ; physical (base) address of the page table 	
  1375 00005F08 F6C101              <1> 	test	cl, 1	 ; check bit 0 is set (1) or not (0).
  1376 00005F0B 740B                <1> 	jz	short pfh_set_pde ; Page directory entry is not valid,
  1377                              <1> 			  	  ; set/validate page directory entry
  1378 00005F0D 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  1379 00005F12 89CB                <1> 	mov	ebx, ecx ; Physical address of the page table
  1380 00005F14 89C1                <1> 	mov	ecx, eax ; new page address (physical) 	
  1381 00005F16 EB16                <1> 	jmp	short pfh_get_pte
  1382                              <1> pfh_set_pde:
  1383                              <1> 	;; NOTE: Page directories and page tables never be swapped out!
  1384                              <1> 	;;	 (So, we know this PDE is empty or invalid)
  1385                              <1> 	;
  1386 00005F18 08D0                <1> 	or	al, dl	 ; lower 3 bits are used as U/S, R/W, P flags
  1387 00005F1A 8903                <1> 	mov	[ebx], eax ; Let's put the new page directory entry here !
  1388 00005F1C 30C0                <1> 	xor	al, al	 ; clear lower (3..8) bits
  1389 00005F1E 89C3                <1> 	mov	ebx, eax
  1390 00005F20 E8A4FCFFFF          <1> 	call	allocate_page	 ; (allocate a new page)
  1391 00005F25 7241                <1> 	jc	short pfh_im_err   ; 'insufficient memory' error
  1392                              <1> pfh_spde_1:
  1393                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  1394 00005F27 89C1                <1> 	mov	ecx, eax
  1395 00005F29 E815FDFFFF          <1> 	call	clear_page ; Clear page content
  1396                              <1> pfh_get_pte:
  1397 00005F2E 0F20D0              <1> 	mov	eax, cr2 ; virtual address
  1398                              <1> 			 ; which has been caused to page fault
  1399 00005F31 89C7                <1> 	mov	edi, eax ; 20/07/2015
  1400 00005F33 C1E80C              <1> 	shr	eax, 12	 ; shift 12 bit right to get 
  1401                              <1> 			 ; higher 20 bits of the page fault address 
  1402 00005F36 25FF030000          <1> 	and	eax, 3FFh ; mask PDE# bits, the result is PTE# (0 to 1023)
  1403 00005F3B C1E002              <1> 	shl	eax, 2	; shift 2 bits left to get PTE offset
  1404 00005F3E 01C3                <1> 	add	ebx, eax ; now, EBX points to the relevant page table entry 
  1405 00005F40 8B03                <1> 	mov	eax, [ebx] ; get previous value of pte
  1406                              <1> 		; bit 0 of EAX is always 0 (otherwise we would not be here)
  1407 00005F42 21C0                <1> 	and	eax, eax
  1408 00005F44 7410                <1> 	jz	short pfh_gpte_1
  1409                              <1> 	; 20/07/2015
  1410 00005F46 87D9                <1> 	xchg	ebx, ecx ; new page address (physical)
  1411 00005F48 55                  <1> 	push	ebp ; 20/07/2015
  1412 00005F49 0F20D5              <1> 	mov	ebp, cr2
  1413                              <1> 		; ECX = physical address of the page table entry
  1414                              <1> 		; EBX = Memory page address (physical!)
  1415                              <1> 		; EAX = Swap disk (offset) address
  1416                              <1> 		; EBP = virtual address (page fault address)
  1417 00005F4C E8B7000000          <1> 	call	swap_in
  1418 00005F51 5D                  <1> 	pop	ebp
  1419 00005F52 7210                <1> 	jc      short pfh_err_retn
  1420 00005F54 87CB                <1> 	xchg	ecx, ebx
  1421                              <1> 		; EBX = physical address of the page table entry
  1422                              <1> 		; ECX = new page
  1423                              <1> pfh_gpte_1:
  1424 00005F56 08D1                <1> 	or	cl, dl	; lower 3 bits are used as U/S, R/W, P flags
  1425 00005F58 890B                <1> 	mov	[ebx], ecx ; Let's put the new page table entry here !
  1426                              <1> pfh_cpp_ok:
  1427                              <1> 	; 20/07/2015
  1428 00005F5A 0F20D3              <1> 	mov	ebx, cr2
  1429 00005F5D E8A6020000          <1> 	call 	add_to_swap_queue
  1430                              <1> 	;
  1431                              <1> 	; The new PTE (which contains the new page) will be added to 
  1432                              <1> 	; the swap queue, here. 
  1433                              <1> 	; (Later, if memory will become insufficient, 
  1434                              <1> 	; one page will be swapped out which is at the head of 
  1435                              <1> 	; the swap queue by using FIFO and access check methods.)
  1436                              <1> 	;
  1437 00005F62 31C0                <1> 	xor	eax, eax  ; 0
  1438                              <1> 	;
  1439                              <1> pfh_err_retn:
  1440 00005F64 59                  <1> 	pop	ecx
  1441 00005F65 5A                  <1> 	pop	edx
  1442 00005F66 5B                  <1> 	pop	ebx
  1443 00005F67 C3                  <1> 	retn 
  1444                              <1> 	
  1445                              <1> pfh_im_err:
  1446 00005F68 B8E4000000          <1> 	mov	eax, ERR_MAJOR_PF + ERR_MINOR_IM ; Error code in AX
  1447                              <1> 			; Major (Primary) Error: Page Fault
  1448                              <1> 			; Minor (Secondary) Error: Insufficient Memory !
  1449 00005F6D EBF5                <1> 	jmp	short pfh_err_retn
  1450                              <1> 
  1451                              <1> 
  1452                              <1> pfh_p_err: ; 09/03/2015
  1453                              <1> pfh_pv_err:
  1454                              <1> 	; Page fault was caused by a protection-violation
  1455 00005F6F B8E6000000          <1> 	mov	eax, ERR_MAJOR_PF + ERR_MINOR_PV ; Error code in AX
  1456                              <1> 			; Major (Primary) Error: Page Fault
  1457                              <1> 			; Minor (Secondary) Error: Protection violation !
  1458 00005F74 F9                  <1> 	stc
  1459 00005F75 EBED                <1> 	jmp	short pfh_err_retn
  1460                              <1> 
  1461                              <1> copy_page:
  1462                              <1> 	; 22/09/2015
  1463                              <1> 	; 21/09/2015
  1464                              <1> 	; 19/09/2015
  1465                              <1> 	; 07/09/2015
  1466                              <1> 	; 31/08/2015
  1467                              <1> 	; 20/07/2015
  1468                              <1> 	; 05/05/2015
  1469                              <1> 	; 03/05/2015
  1470                              <1> 	; 18/04/2015
  1471                              <1> 	; 12/04/2015
  1472                              <1> 	; 30/10/2014
  1473                              <1> 	; 18/10/2014 (Retro UNIX 386 v1 - beginning)
  1474                              <1> 	;
  1475                              <1> 	; INPUT -> 
  1476                              <1> 	;	EBX = Virtual (linear) address of source page
  1477                              <1> 	;	     (Page fault address)
  1478                              <1> 	; OUTPUT ->
  1479                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE ALLOCATED PAGE
  1480                              <1> 	;	(corresponding PAGE TABLE ENTRY is mapped/set)
  1481                              <1> 	;	EAX = 0 (CF = 1) 
  1482                              <1> 	;		if there is not a free page to be allocated
  1483                              <1> 	;	(page content of the source page will be copied
  1484                              <1> 	;	onto the target/new page) 	
  1485                              <1> 	;
  1486                              <1> 	; Modified Registers -> ecx, ebx (except EAX)
  1487                              <1> 	;	
  1488 00005F77 56                  <1> 	push	esi
  1489 00005F78 57                  <1> 	push	edi
  1490                              <1> 	;push	ebx
  1491                              <1> 	;push	ecx
  1492 00005F79 31F6                <1> 	xor 	esi, esi
  1493 00005F7B C1EB0C              <1> 	shr	ebx, 12 ; shift 12 bits right to get PDE & PTE numbers
  1494 00005F7E 89D9                <1> 	mov	ecx, ebx ; save page fault address (as 12 bit shifted)
  1495 00005F80 C1EB08              <1> 	shr	ebx, 8	 ; shift 8 bits right and then
  1496 00005F83 80E3FC              <1> 	and	bl, 0FCh ; mask lower 2 bits to get PDE offset	
  1497 00005F86 89DF                <1> 	mov 	edi, ebx ; save it for the parent of current process
  1498 00005F88 031D[B8030300]      <1> 	add	ebx, [u.pgdir] ; EBX points to the relevant page dir entry 
  1499 00005F8E 8B03                <1> 	mov	eax, [ebx] ; physical (base) address of the page table
  1500 00005F90 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits 	
  1501 00005F94 89CB                <1> 	mov	ebx, ecx   ; (restore higher 20 bits of page fault address)
  1502 00005F96 81E3FF030000        <1> 	and	ebx, 3FFh  ; mask PDE# bits, the result is PTE# (0 to 1023)
  1503 00005F9C 66C1E302            <1> 	shl	bx, 2	   ; shift 2 bits left to get PTE offset
  1504 00005FA0 01C3                <1> 	add	ebx, eax   ; EBX points to the relevant page table entry 
  1505                              <1> 	; 07/09/2015
  1506 00005FA2 66F7030002          <1>         test    word [ebx], PTE_DUPLICATED ; (Does current process share this
  1507                              <1> 				     ; read only page as a child process?)	
  1508 00005FA7 7509                <1> 	jnz	short cpp_0 ; yes
  1509 00005FA9 8B0B                <1> 	mov	ecx, [ebx] ; PTE value
  1510 00005FAB 6681E100F0          <1> 	and	cx, PTE_A_CLEAR ; 0F000h  ; clear page attributes
  1511 00005FB0 EB32                <1> 	jmp	short cpp_1
  1512                              <1> cpp_0:
  1513 00005FB2 89FE                <1> 	mov	esi, edi
  1514 00005FB4 0335[BC030300]      <1> 	add	esi, [u.ppgdir] ; the parent's page directory entry
  1515 00005FBA 8B06                <1> 	mov	eax, [esi] ; physical (base) address of the page table
  1516 00005FBC 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  1517 00005FC0 89CE                <1> 	mov	esi, ecx   ; (restore higher 20 bits of page fault address)	
  1518 00005FC2 81E6FF030000        <1> 	and	esi, 3FFh  ; mask PDE# bits, the result is PTE# (0 to 1023)
  1519 00005FC8 66C1E602            <1> 	shl	si, 2	   ; shift 2 bits left to get PTE offset
  1520 00005FCC 01C6                <1> 	add	esi, eax   ; EDX points to the relevant page table entry  	
  1521 00005FCE 8B0E                <1> 	mov	ecx, [esi] ; PTE value of the parent process
  1522                              <1> 	; 21/09/2015
  1523 00005FD0 8B03                <1> 	mov	eax, [ebx] ; PTE value of the child process
  1524 00005FD2 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear page attributes	
  1525                              <1> 	;
  1526 00005FD6 F6C101              <1> 	test	cl, PTE_A_PRESENT ; is it a present/valid page ?
  1527 00005FD9 7424                <1> 	jz	short cpp_3 ; the parent's page is not same page  	
  1528                              <1> 	;
  1529 00005FDB 6681E100F0          <1> 	and	cx, PTE_A_CLEAR ; 0F000h ; clear page attributes
  1530 00005FE0 39C8                <1> 	cmp	eax, ecx   ; Same page?	
  1531 00005FE2 751B                <1> 	jne	short cpp_3 ; Parent page and child page are not same 
  1532                              <1> 			    ; Convert child's page to writable page
  1533                              <1> cpp_1:
  1534 00005FE4 E8E0FBFFFF          <1> 	call	allocate_page
  1535 00005FE9 721A                <1> 	jc	short cpp_4 ; 'insufficient memory' error
  1536 00005FEB 21F6                <1> 	and	esi, esi    ; check ESI is valid or not
  1537 00005FED 7405                <1> 	jz	short cpp_2
  1538                              <1> 		; Convert read only page to writable page 
  1539                              <1> 		;(for the parent of the current process)
  1540                              <1> 	;and	word [esi], PTE_A_CLEAR ; 0F000h
  1541                              <1> 	; 22/09/2015
  1542 00005FEF 890E                <1> 	mov	[esi], ecx
  1543 00005FF1 800E07              <1> 	or	byte [esi], PTE_A_PRESENT + PTE_A_WRITE + PTE_A_USER
  1544                              <1> 				 ; 1+2+4 = 7
  1545                              <1> cpp_2:
  1546 00005FF4 89C7                <1> 	mov	edi, eax ; new page address of the child process
  1547                              <1> 	; 07/09/2015
  1548 00005FF6 89CE                <1> 	mov	esi, ecx ; the page address of the parent process
  1549 00005FF8 B900040000          <1> 	mov	ecx, PAGE_SIZE / 4
  1550 00005FFD F3A5                <1> 	rep	movsd ; 31/08/2015
  1551                              <1> cpp_3:		
  1552 00005FFF 0C07                <1> 	or	al, PTE_A_PRESENT + PTE_A_WRITE + PTE_A_USER ; 1+2+4 = 7
  1553 00006001 8903                <1> 	mov	[ebx], eax ; Update PTE
  1554 00006003 28C0                <1> 	sub	al, al ; clear attributes
  1555                              <1> cpp_4:
  1556                              <1> 	;pop	ecx
  1557                              <1> 	;pop	ebx
  1558 00006005 5F                  <1> 	pop	edi
  1559 00006006 5E                  <1> 	pop	esi
  1560 00006007 C3                  <1> 	retn
  1561                              <1> 
  1562                              <1> ;; 28/04/2015
  1563                              <1> ;; 24/10/2014
  1564                              <1> ;; 21/10/2014 (Retro UNIX 386 v1 - beginning)
  1565                              <1> ;; SWAP_PAGE_QUEUE (4096 bytes)
  1566                              <1> ;;
  1567                              <1> ;;   0000   0001   0002   0003   ....   1020   1021   1022   1023	
  1568                              <1> ;; +------+------+------+------+-    -+------+------+------+------+
  1569                              <1> ;; |  pg1 |  pg2 |  pg3 |  pg4 | .... |pg1021|pg1022|pg1023|pg1024|
  1570                              <1> ;; +------+------+------+------+-    -+------+------+------+------+    
  1571                              <1> ;;
  1572                              <1> ;; [swpq_last] = 0 to 4096 (step 4) -> the last position on the queue
  1573                              <1> ;;
  1574                              <1> ;; Method:
  1575                              <1> ;;	Swap page queue is a list of allocated pages with physical
  1576                              <1> ;;	addresses (system mode virtual adresses = physical addresses).
  1577                              <1> ;;	It is used for 'swap_in' and 'swap_out' procedures.
  1578                              <1> ;;	When a new page is being allocated, swap queue is updated
  1579                              <1> ;;	by 'swap_queue_shift' procedure, header of the queue (offset 0)
  1580                              <1> ;;	is checked for 'accessed' flag. If the 1st page on the queue
  1581                              <1> ;;	is 'accessed' or 'read only', it is dropped from the list;
  1582                              <1> ;;	other pages from the 2nd to the last (in [swpq_last]) shifted
  1583                              <1> ;; 	to head then the 2nd page becomes the 1st and '[swpq_last]' 
  1584                              <1> ;;	offset value becomes it's previous offset value - 4.
  1585                              <1> ;;	If the 1st page of the swap page queue is not 'accessed'	
  1586                              <1> ;;	the queue/list is not shifted.
  1587                              <1> ;;	After the queue/list shift, newly allocated page is added
  1588                              <1> ;;	to the tail of the queue at the [swpq_count*4] position.
  1589                              <1> ;;	But, if [swpq_count] > 1023, the newly allocated page
  1590                              <1> ;;	will not be added to the tail of swap page queue.  		 
  1591                              <1> ;;	
  1592                              <1> ;;	During 'swap_out' procedure, swap page queue is checked for
  1593                              <1> ;;	the first non-accessed, writable page in the list, 
  1594                              <1> ;;	from the head to the tail. The list is shifted to left 
  1595                              <1> ;;	(to the head) till a non-accessed page will be found in the list.
  1596                              <1> ;;	Then, this page	is swapped out (to disk) and then it is dropped
  1597                              <1> ;;	from the list by a final swap queue shift. [swpq_count] value
  1598                              <1> ;;	is changed. If all pages on the queue' are 'accessed', 
  1599                              <1> ;;	'insufficient memory' error will be returned ('swap_out' 
  1600                              <1> ;;	procedure will be failed)...
  1601                              <1> ;;
  1602                              <1> ;;	Note: If the 1st page of the queue is an 'accessed' page,
  1603                              <1> ;;	'accessed' flag of the page will be reset (0) and that page
  1604                              <1> ;;	(PTE) will be added to the tail of the queue after
  1605                              <1> ;;	the check, if [swpq_count] < 1023. If [swpq_count] = 1024
  1606                              <1> ;;	the queue will be rotated and the PTE in the head will be
  1607                              <1> ;;	added to the tail after resetting 'accessed' bit. 
  1608                              <1> ;;
  1609                              <1> ;;
  1610                              <1> ;;	
  1611                              <1> ;; SWAP DISK/FILE (with 4096 bytes swapped page blocks)
  1612                              <1> ;;
  1613                              <1> ;;  00000000  00000004  00000008  0000000C   ...   size-8    size-4
  1614                              <1> ;; +---------+---------+---------+---------+-- --+---------+---------+
  1615                              <1> ;; |descriptr| page(1) | page(2) | page(3) | ... |page(n-1)| page(n) |
  1616                              <1> ;; +---------+---------+---------+---------+-- --+---------+---------+    
  1617                              <1> ;;
  1618                              <1> ;; [swpd_next] = the first free block address in swapped page records
  1619                              <1> ;;    		 for next free block search by 'swap_out' procedure.
  1620                              <1> ;; [swpd_size] = swap disk/file size in sectors (512 bytes)
  1621                              <1> ;;		 NOTE: max. possible swap disk size is 1024 GB
  1622                              <1> ;; 		 (entire swap space must be accessed by using
  1623                              <1> ;;		 31 bit offset address) 
  1624                              <1> ;; [swpd_free] = free block (4096 bytes) count in swap disk/file space
  1625                              <1> ;; [swpd_start] = absolute/start address of the swap disk/file
  1626                              <1> ;;		  0 for file, or beginning sector of the swap partition
  1627                              <1> ;; [swp_drv] = logical drive description table addr. of swap disk/file
  1628                              <1> ;;
  1629                              <1> ;; 					
  1630                              <1> ;; Method:
  1631                              <1> ;;	When the memory (ram) becomes insufficient, page allocation
  1632                              <1> ;;	procedure swaps out a page from memory to the swap disk 
  1633                              <1> ;;	(partition) or swap file to get a new free page at the memory.
  1634                              <1> ;;	Swapping out is performed by using swap page queue.
  1635                              <1> ;;
  1636                              <1> ;; 	Allocation block size of swap disk/file is equal to page size
  1637                              <1> ;;	(4096 bytes). Swapping address (in sectors) is recorded
  1638                              <1> ;;	into relevant page file entry as 31 bit physical (logical)
  1639                              <1> ;;	offset address as 1 bit shifted to left for present flag (0).
  1640                              <1> ;;	Swapped page address is between 1 and swap disk/file size - 4.	  
  1641                              <1> ;;	Absolute physical (logical) address of the swapped page is 
  1642                              <1> ;;	calculated by adding offset value to the swap partition's 
  1643                              <1> ;;	start address. If the swap device (disk) is a virtual disk 
  1644                              <1> ;;	or it is a file, start address of the swap disk/volume is 0, 
  1645                              <1> ;;	and offset value is equal to absolute (physical or logical)
  1646                              <1> ;;	address/position. (It has not to be ZERO if the swap partition 
  1647                              <1> ;;	is in a partitioned virtual hard disk.) 
  1648                              <1> ;;
  1649                              <1> ;;	Note: Swap addresses are always specified/declared in sectors, 
  1650                              <1> ;;	not in bytes or	in blocks/zones/clusters (4096 bytes) as unit.
  1651                              <1> ;;
  1652                              <1> ;;	Swap disk/file allocation is mapped via 'Swap Allocation Table'
  1653                              <1> ;;	at memory as similar to 'Memory Allocation Table'.
  1654                              <1> ;;
  1655                              <1> ;;	Every bit of Swap Allocation Table repsesents one swap block
  1656                              <1> ;;	(equal to page size) respectively. Bit 0 of the S.A.T. byte 0
  1657                              <1> ;;	is reserved for swap disk/file block 0 as descriptor block
  1658                              <1> ;;	(also for compatibility with PTE). If bit value is ZERO,
  1659                              <1> ;;	it means relevant (respective) block is in use, and, 
  1660                              <1> ;;	of course, if bit value is 1, it means relevant (respective)
  1661                              <1> ;;      swap disk/file block is free.
  1662                              <1> ;;	For example: bit 1 of the byte 128 repsesents block 1025 
  1663                              <1> ;;	(128*8+1) or sector (offset) 8200 on the swap disk or
  1664                              <1> ;;	byte (offset/position) 4198400 in the swap file. 
  1665                              <1> ;;	4GB swap space is represented via 128KB Swap Allocation Table.
  1666                              <1> ;;	Initial layout of Swap Allocation Table is as follows:
  1667                              <1> ;;	------------------------------------------------------------
  1668                              <1> ;;	0111111111111111111111111 .... 11111111111111111111111111111
  1669                              <1> ;;	------------------------------------------------------------
  1670                              <1> ;;	(0 is reserved block, 1s represent free blocks respectively.)
  1671                              <1> ;;	(Note: Allocation cell/unit of the table is bit, not byte)
  1672                              <1> ;;
  1673                              <1> ;;	..............................................................
  1674                              <1> ;;
  1675                              <1> ;;	'swap_out' procedure checks 'free_swap_blocks' count at first,
  1676                              <1> ;;	then it searches Swap Allocation Table if free count is not
  1677                              <1> ;;	zero. From begining the [swpd_next] dword value, the first bit 
  1678                              <1> ;;	position with value of 1 on the table is converted to swap
  1679                              <1> ;;	disk/file offset address, in sectors (not 4096 bytes block).
  1680                              <1> ;;	'ldrv_write' procedure is called with ldrv (logical drive
  1681                              <1> ;;	number of physical swap disk or virtual swap disk)
  1682                              <1> ;;	number, sector offset (not absolute sector -LBA- number),
  1683                              <1> ;;	and sector count (8, 512*8 = 4096) and buffer adress
  1684                              <1> ;;	(memory page). That will be a direct disk write procedure.
  1685                              <1> ;;	(for preventing late memory allocation, significant waiting). 
  1686                              <1> ;;	If disk write procedure returns with error or free count of 
  1687                              <1> ;;	swap blocks is ZERO, 'swap_out' procedure will return with
  1688                              <1> ;;	'insufficient memory error' (cf=1). 
  1689                              <1> ;;
  1690                              <1> ;;	(Note: Even if free swap disk/file blocks was not zero,
  1691                              <1> ;;	any disk write error will not be fixed by 'swap_out' procedure,
  1692                              <1> ;;	in other words, 'swap_out' will not check the table for other
  1693                              <1> ;;	free blocks after a disk write error. It will return to 
  1694                              <1> ;;	the caller with error (CF=1) which means swapping is failed. 
  1695                              <1> ;;
  1696                              <1> ;;	After writing the page on to swap disk/file address/sector,
  1697                              <1> ;;	'swap_out' procesure returns with that swap (offset) sector
  1698                              <1> ;;	address (cf=0). 
  1699                              <1> ;;
  1700                              <1> ;;	..............................................................
  1701                              <1> ;;
  1702                              <1> ;;	'swap_in' procedure loads addressed (relevant) swap disk or
  1703                              <1> ;;	file sectors at specified memory page. Then page allocation
  1704                              <1> ;;	procedure updates relevant page table entry with 'present' 
  1705                              <1> ;;	attribute. If swap disk or file reading fails there is nothing
  1706                              <1> ;;	to do, except to terminate the process which is the owner of
  1707                              <1> ;;	the swapped page.
  1708                              <1> ;;
  1709                              <1> ;;	'swap_in' procedure sets the relevant/respective bit value
  1710                              <1> ;;	in the Swap Allocation Table (as free block). 'swap_in' also
  1711                              <1> ;;	updates [swpd_first] pointer if it is required.
  1712                              <1> ;;
  1713                              <1> ;;	..............................................................	 
  1714                              <1> ;;
  1715                              <1> ;;	Note: If [swap_enabled] value is ZERO, that means there is not
  1716                              <1> ;;	a swap disk or swap file in use... 'swap_in' and 'swap_out'
  1717                              <1> ;;	procedures ans 'swap page que' procedures will not be active...
  1718                              <1> ;;	'Insufficient memory' error will be returned by 'swap_out'
  1719                              <1> ;;	and 'general protection fault' will be returned by 'swap_in'
  1720                              <1> ;;	procedure, if it is called mistakenly (a wrong value in a PTE).		
  1721                              <1> ;;
  1722                              <1> 
  1723                              <1> swap_in:
  1724                              <1> 	; 31/08/2015
  1725                              <1> 	; 20/07/2015
  1726                              <1> 	; 28/04/2015
  1727                              <1> 	; 18/04/2015
  1728                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  1729                              <1> 	;
  1730                              <1> 	; INPUT -> 
  1731                              <1> 	;	EBX = PHYSICAL (real/flat) ADDRESS OF THE MEMORY PAGE
  1732                              <1> 	;	EBP = VIRTUAL (LINEAR) ADDRESS (page fault address)
  1733                              <1> 	;	EAX = Offset Address for the swapped page on the
  1734                              <1> 	;	      swap disk or in the swap file.
  1735                              <1> 	;
  1736                              <1> 	; OUTPUT ->
  1737                              <1> 	;	EAX = 0 if loading at memory has been successful
  1738                              <1> 	;
  1739                              <1> 	;	CF = 1 -> swap disk reading error (disk/file not present
  1740                              <1> 	;		  or sector not present or drive not ready
  1741                              <1> 	;	     EAX = Error code
  1742                              <1> 	;	     [u.error] = EAX 
  1743                              <1> 	;		       = The last error code for the process
  1744                              <1> 	;		         (will be reset after returning to user)	  
  1745                              <1> 	;
  1746                              <1> 	; Modified Registers -> EAX
  1747                              <1> 	;
  1748                              <1> 
  1749 00006008 833D[62050300]00    <1>         cmp     dword [swp_drv], 0
  1750 0000600F 7646                <1> 	jna	short swpin_dnp_err
  1751                              <1> 
  1752 00006011 3B05[66050300]      <1> 	cmp	eax, [swpd_size]
  1753 00006017 734A                <1> 	jnb	short swpin_snp_err
  1754                              <1> 
  1755 00006019 56                  <1> 	push	esi
  1756 0000601A 53                  <1> 	push	ebx
  1757 0000601B 51                  <1> 	push	ecx
  1758 0000601C 8B35[62050300]      <1> 	mov	esi, [swp_drv]	
  1759 00006022 B908000000          <1> 	mov	ecx, PAGE_SIZE / LOGIC_SECT_SIZE  ; 8 !
  1760                              <1> 		; Note: Even if corresponding physical disk's sector 
  1761                              <1> 		; size different than 512 bytes, logical disk sector
  1762                              <1> 		; size is 512 bytes and disk reading procedure
  1763                              <1> 		; will be performed for reading 4096 bytes
  1764                              <1> 		; (2*2048, 8*512). 
  1765                              <1> 	; ESI = Logical disk description table address
  1766                              <1> 	; EBX = Memory page (buffer) address (physical!)
  1767                              <1> 	; EAX = Sector adress (offset address, logical sector number)
  1768                              <1> 	; ECX = Sector count ; 8 sectors
  1769 00006027 50                  <1> 	push	eax
  1770 00006028 E8AF020000          <1> 	call	logical_disk_read
  1771 0000602D 58                  <1> 	pop	eax
  1772 0000602E 730C                <1> 	jnc	short swpin_read_ok
  1773                              <1> 	;
  1774 00006030 B828000000          <1> 	mov	eax, SWP_DISK_READ_ERR ; drive not ready or read error
  1775 00006035 A3[C8030300]        <1> 	mov	[u.error], eax
  1776 0000603A EB17                <1> 	jmp	short swpin_retn
  1777                              <1> 	;
  1778                              <1> swpin_read_ok:
  1779                              <1> 	; EAX = Offset address (logical sector number)
  1780 0000603C E80D020000          <1> 	call	unlink_swap_block  ; Deallocate swap block	
  1781                              <1> 	;
  1782                              <1> 	; EBX = Memory page (buffer) address (physical!)
  1783                              <1> 	; 20/07/2015
  1784 00006041 89EB                <1> 	mov	ebx, ebp ; virtual address (page fault address)
  1785 00006043 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  1786 00006048 8A1D[B3030300]      <1> 	mov	bl, [u.uno] ; current process number
  1787                              <1> 	; EBX = Virtual (Linear) address & process number combination
  1788 0000604E E8DB000000          <1> 	call	swap_queue_shift
  1789                              <1> 	; eax = 0 ; 10/06/2016 (if ebx input > 0, eax output = 0)
  1790                              <1> 	;sub	eax, eax  ; 0 ; Error Code = 0  (no error)
  1791                              <1> 	; zf = 1
  1792                              <1> swpin_retn:
  1793 00006053 59                  <1> 	pop	ecx
  1794 00006054 5B                  <1> 	pop	ebx
  1795 00006055 5E                  <1> 	pop	esi
  1796 00006056 C3                  <1> 	retn
  1797                              <1> 
  1798                              <1> swpin_dnp_err:
  1799 00006057 B829000000          <1> 	mov	eax, SWP_DISK_NOT_PRESENT_ERR
  1800                              <1> swpin_err_retn:
  1801 0000605C A3[C8030300]        <1> 	mov	[u.error], eax
  1802 00006061 F9                  <1> 	stc
  1803 00006062 C3                  <1> 	retn
  1804                              <1> 
  1805                              <1> swpin_snp_err:
  1806 00006063 B82A000000          <1> 	mov	eax, SWP_SECTOR_NOT_PRESENT_ERR
  1807 00006068 EBF2                <1> 	jmp	short swpin_err_retn
  1808                              <1> 
  1809                              <1> swap_out:
  1810                              <1> 	; 10/06/2016
  1811                              <1> 	; 07/06/2016
  1812                              <1>         ; 23/05/2016
  1813                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  1814                              <1> 	; 24/10/2014 - 31/08/2015 (Retro UNIX 386 v1)
  1815                              <1> 	;
  1816                              <1> 	; INPUT -> 
  1817                              <1> 	;	none
  1818                              <1> 	;
  1819                              <1> 	; OUTPUT ->
  1820                              <1> 	;	EAX = Physical page address (which is swapped out
  1821                              <1> 	;	      for allocating a new page)
  1822                              <1> 	;	CF = 1 -> swap disk writing error (disk/file not present
  1823                              <1> 	;		  or sector not present or drive not ready
  1824                              <1> 	;	     EAX = Error code
  1825                              <1> 	;	     [u.error] = EAX 
  1826                              <1> 	;		       = The last error code for the process
  1827                              <1> 	;		         (will be reset after returning to user)	  
  1828                              <1> 	;
  1829                              <1> 	; Modified Registers -> none (except EAX)
  1830                              <1> 	;
  1831 0000606A 66833D[60050300]01  <1> 	cmp 	word [swpq_count], 1
  1832 00006072 0F82AF000000        <1>         jc      swpout_im_err ; 'insufficient memory'
  1833                              <1> 
  1834                              <1>         ;cmp    dword [swp_drv], 1
  1835                              <1> 	;jc	short swpout_dnp_err ; 'swap disk/file not present'
  1836                              <1> 
  1837 00006078 833D[6A050300]01    <1>         cmp     dword [swpd_free], 1
  1838 0000607F 0F828F000000        <1>         jc      swpout_nfspc_err ; 'no free space on swap disk'
  1839                              <1> 
  1840 00006085 53                  <1> 	push	ebx ; *
  1841                              <1> swpout_1:
  1842                              <1> 	; 10/06/2016
  1843 00006086 31DB                <1> 	xor	ebx, ebx ; shift the queue and return a PTE value
  1844 00006088 E8A1000000          <1> 	call	swap_queue_shift
  1845 0000608D 21C0                <1> 	and	eax, eax	; 0 = empty queue (improper entries)
  1846 0000608F 0F848A000000        <1>         jz      swpout_npts_err        ; There is not any proper PTE
  1847                              <1> 				       ; pointer in the swap queue
  1848                              <1> 	; EAX = PTE value of the page
  1849                              <1> 	; EBX = PTE address of the page
  1850 00006095 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  1851                              <1> 	;
  1852                              <1> 	; 07/06/2016
  1853                              <1> 	; 19/05/2016
  1854                              <1> 	; check this page is in timer events or not
  1855                              <1> 	
  1856                              <1> swpout_timer_page_0:
  1857 00006099 52                  <1> 	push	edx ; **
  1858                              <1> 
  1859                              <1> 	; 07/06/2016
  1860 0000609A 803D[238E0100]00    <1> 	cmp	byte [timer_events], 0 
  1861 000060A1 762F                <1> 	jna	short swpout_2
  1862                              <1> 	;
  1863 000060A3 8A15[238E0100]      <1> 	mov	dl, [timer_events]
  1864                              <1> 
  1865 000060A9 51                  <1> 	push	ecx ; ***
  1866 000060AA 53                  <1> 	push	ebx ; ****
  1867 000060AB BB[60040300]        <1> 	mov	ebx, timer_set ; beginning address of timer event
  1868                              <1> 			       ; structures 
  1869                              <1> swpout_timer_page_1:
  1870 000060B0 8A0B                <1> 	mov	cl, [ebx]
  1871 000060B2 08C9                <1> 	or	cl, cl ; 0 = free, >0 = process number
  1872 000060B4 7415                <1> 	jz	short swpout_timer_page_3
  1873 000060B6 8B4B0C              <1> 	mov	ecx, [ebx+12] ; response (signal return) address
  1874 000060B9 6681E100F0          <1> 	and	cx, PTE_A_CLEAR ; clear offset part (right 12 bits)
  1875                              <1> 				; of the response byte address, to
  1876                              <1> 				; get beginning of the page address)
  1877 000060BE 39C8                <1> 	cmp	eax, ecx
  1878 000060C0 7505                <1> 	jne	short swpout_timer_page_2 ; not same page
  1879                              <1> 	
  1880                              <1> 	; !same page!
  1881                              <1> 	;
  1882                              <1> 	; NOTE: // 19/05/2016 // - TRDOS 386 feature only ! -
  1883                              <1> 	; This page will be used by the kernel to put timer event
  1884                              <1> 	; response (signal return) byte at the requested address;
  1885                              <1> 	; in order to prevent a possible wrong write (while
  1886                              <1> 	; this page is swapped out) on physical memory,
  1887                              <1> 	; we must protect this page against to be swapped out!
  1888                              <1> 	;
  1889 000060C2 5B                  <1> 	pop	ebx ; ****
  1890 000060C3 59                  <1> 	pop	ecx ; ***
  1891 000060C4 5A                  <1> 	pop	edx ; **
  1892 000060C5 EBBF                <1> 	jmp	short swpout_1	; do not swap out this page !
  1893                              <1>  
  1894                              <1> swpout_timer_page_2:
  1895                              <1> 	; 07/06/2016
  1896 000060C7 FECA                <1> 	dec	dl
  1897 000060C9 7405                <1> 	jz	short swpout_timer_page_4
  1898                              <1> swpout_timer_page_3:
  1899                              <1> 	;cmp	ebx, timer_set + 240 ; last timer event (15*16) 
  1900                              <1> 	;jnb	short swpout_timer_page_4
  1901 000060CB 83C310              <1> 	add	ebx, 16
  1902 000060CE EBE0                <1> 	jmp	short swpout_timer_page_1	
  1903                              <1> 
  1904                              <1> swpout_timer_page_4:
  1905 000060D0 5B                  <1> 	pop	ebx ; ****
  1906 000060D1 59                  <1> 	pop	ecx ; ***
  1907                              <1> swpout_2:
  1908 000060D2 89DA                <1> 	mov	edx, ebx	       ; Page table entry address	
  1909 000060D4 89C3                <1> 	mov	ebx, eax	       ; Buffer (Page) Address				
  1910                              <1> 	;
  1911 000060D6 E8A6010000          <1> 	call	link_swap_block
  1912 000060DB 7304                <1> 	jnc	short swpout_3	       ; It may not be needed here	
  1913                              <1> 				       ; because [swpd_free] value
  1914                              <1> 				       ; was checked at the beginging. 	
  1915 000060DD 5A                  <1> 	pop	edx ; **
  1916 000060DE 5B                  <1> 	pop	ebx ; *
  1917 000060DF EB33                <1> 	jmp	short swpout_nfspc_err 
  1918                              <1> swpout_3:
  1919 000060E1 A900000080          <1> 	test	eax, 80000000h ; test bit 31 (this may not be needed!)
  1920 000060E6 752C                <1> 	jnz	short swpout_nfspc_err  ; 10/06/2016 (bit 31 = 1 !)
  1921                              <1> 	;	
  1922 000060E8 56                  <1> 	push	esi ; **
  1923 000060E9 51                  <1> 	push	ecx ; ***
  1924 000060EA 50                  <1> 	push	eax ; sector address ; (31 bit !, bit 31 = 0)
  1925 000060EB 8B35[62050300]      <1> 	mov	esi, [swp_drv]	
  1926 000060F1 B908000000          <1> 	mov	ecx, PAGE_SIZE / LOGIC_SECT_SIZE  ; 8 !
  1927                              <1> 		; Note: Even if corresponding physical disk's sector 
  1928                              <1> 		; size different than 512 bytes, logical disk sector
  1929                              <1> 		; size is 512 bytes and disk writing procedure
  1930                              <1> 		; will be performed for writing 4096 bytes
  1931                              <1> 		; (2*2048, 8*512). 
  1932                              <1> 	; ESI = Logical disk description table address
  1933                              <1> 	; EBX = Buffer (Page) address
  1934                              <1> 	; EAX = Sector adress (offset address, logical sector number)
  1935                              <1> 	; ECX = Sector count ; 8 sectors
  1936                              <1> 	; edx = PTE address
  1937 000060F6 E8E2010000          <1> 	call	logical_disk_write
  1938                              <1> 	; edx = PTE address
  1939 000060FB 59                  <1> 	pop	ecx ; sector address	
  1940 000060FC 730C                <1> 	jnc	short swpout_write_ok
  1941                              <1> 	;
  1942                              <1> 	;; call	unlink_swap_block ; this block must be left as 'in use'
  1943                              <1> swpout_dw_err:
  1944 000060FE B82C000000          <1> 	mov	eax, SWP_DISK_WRITE_ERR ; drive not ready or write error
  1945 00006103 A3[C8030300]        <1> 	mov	[u.error], eax
  1946 00006108 EB06                <1> 	jmp	short swpout_retn
  1947                              <1> 	;
  1948                              <1> swpout_write_ok:
  1949                              <1> 	; EBX = Buffer (page) address
  1950                              <1> 	; EDX = Page Table Entry address
  1951                              <1> 	; ECX = Swap disk sector (file block) address (31 bit)
  1952 0000610A D1E1                <1> 	shl 	ecx, 1  ; 31 bit sector address from bit 1 to bit 31 
  1953 0000610C 890A                <1> 	mov 	[edx], ecx 
  1954                              <1> 		; bit 0 = 0 (swapped page)
  1955 0000610E 89D8                <1> 	mov	eax, ebx
  1956                              <1> swpout_retn:
  1957 00006110 59                  <1> 	pop	ecx ; ***
  1958 00006111 5E                  <1> 	pop	esi ; **
  1959 00006112 5B                  <1> 	pop	ebx ; *
  1960 00006113 C3                  <1> 	retn
  1961                              <1> 
  1962                              <1> ;swpout_dnp_err:
  1963                              <1> ;	mov	eax, SWP_DISK_NOT_PRESENT_ERR ; disk not present
  1964                              <1> ;	jmp	short swpout_err_retn
  1965                              <1> swpout_nfspc_err:
  1966 00006114 B82B000000          <1> 	mov	eax, SWP_NO_FREE_SPACE_ERR ; no free space
  1967                              <1> swpout_err_retn:
  1968 00006119 A3[C8030300]        <1> 	mov	[u.error], eax
  1969                              <1> 	;stc
  1970 0000611E C3                  <1> 	retn
  1971                              <1> swpout_npts_err:
  1972 0000611F B82D000000          <1> 	mov	eax, SWP_NO_PAGE_TO_SWAP_ERR
  1973 00006124 5B                  <1> 	pop	ebx
  1974 00006125 EBF2                <1> 	jmp	short swpout_err_retn
  1975                              <1> swpout_im_err:
  1976 00006127 B804000000          <1> 	mov	eax, ERR_MINOR_IM ; insufficient (out of) memory
  1977 0000612C EBEB                <1> 	jmp	short swpout_err_retn
  1978                              <1> 
  1979                              <1> swap_queue_shift:
  1980                              <1> 	; 26/03/2017
  1981                              <1> 	; 10/06/2016
  1982                              <1> 	; 09/06/2016 - TRDOS 386 (TRDOS v2.0)
  1983                              <1> 	; 23/10/2014 - 20/07/2015 (Retro UNIX 386 v1)
  1984                              <1> 	;
  1985                              <1> 	; INPUT ->
  1986                              <1> 	;	EBX = Virtual (linear) address (bit 12 to 31) 
  1987                              <1> 	;	      and process number combination (bit 0 to 11)
  1988                              <1> 	;	EBX = 0 -> shift/drop from the head (offset 0)
  1989                              <1> 	;	
  1990                              <1> 	; OUTPUT ->
  1991                              <1> 	;	If EBX input > 0 
  1992                              <1> 	;	   the queue will be shifted 4 bytes (dword),
  1993                              <1> 	; 	   from the tail to the head, up to entry offset
  1994                              <1> 	; 	   which points to EBX input value or nothing
  1995                              <1> 	;	   to do if EBX value is not found on the queue.
  1996                              <1> 	;	   (The entry -with EBX value- will be removed
  1997                              <1> 	;	   from the queue if it is found.)
  1998                              <1> 	;
  1999                              <1> 	;	   EAX = 0		
  2000                              <1> 	;
  2001                              <1> 	;	If EBX input = 0
  2002                              <1> 	;	   the queue will be shifted 4 bytes (dword),
  2003                              <1> 	; 	   from the tail to the head, if the PTE address
  2004                              <1> 	;	   which is pointed in head of the queue is marked
  2005                              <1> 	;	   as "accessed" or it is marked as "non present".
  2006                              <1> 	;	   (If "accessed" flag of the PTE -which is pointed
  2007                              <1> 	;	   in the head- is set -to 1-, it will be reset
  2008                              <1> 	;	   -to 0- and then, the queue will be rotated 
  2009                              <1> 	;	   -without dropping pointer of the PTE from 
  2010                              <1> 	;	   the queue- for 4 bytes on head to tail direction.
  2011                              <1> 	;	   Pointer in the head will be moved into the tail,
  2012                              <1> 	;	   other PTEs will be shifted on head direction.)
  2013                              <1> 	;
  2014                              <1> 	;	   Swap queue will be shifted up to the first
  2015                              <1> 	;	   'present' or 'non accessed' page will be found
  2016                              <1> 	;	   (as pointed) on the queue head (then it will be
  2017                              <1>         ;          removed/dropped from the queue).
  2018                              <1> 	;
  2019                              <1> 	;	   EAX (> 0) = PTE value of the page which is
  2020                              <1> 	;		 (it's pointer -virtual address-) dropped
  2021                              <1> 	;		 (removed) from swap queue.
  2022                              <1> 	;	   EBX = PTE address of the page (if EAX > 0)
  2023                              <1> 	;	         which is (it's pointer -virtual address-)
  2024                              <1> 	;		 dropped (removed) from swap queue.
  2025                              <1> 	;
  2026                              <1> 	;	   EAX = 0 -> empty swap queue ! 
  2027                              <1> 	;
  2028                              <1> 	; Modified Registers -> EAX, EBX
  2029                              <1> 	;
  2030 0000612E 0FB705[60050300]    <1> 	movzx   eax, word [swpq_count]  ; Max. 1024
  2031 00006135 6621C0              <1> 	and	ax, ax
  2032 00006138 7431                <1> 	jz	short swpqs_retn
  2033 0000613A 57                  <1> 	push	edi
  2034 0000613B 56                  <1> 	push	esi
  2035 0000613C 51                  <1> 	push	ecx
  2036 0000613D BE00E00800          <1> 	mov	esi, swap_queue
  2037 00006142 89C1                <1> 	mov	ecx, eax
  2038 00006144 09DB                <1> 	or	ebx, ebx
  2039 00006146 7424                <1> 	jz	short swpqs_7
  2040                              <1> swpqs_1:
  2041 00006148 AD                  <1> 	lodsd
  2042 00006149 39D8                <1> 	cmp	eax, ebx
  2043 0000614B 7406                <1> 	je	short swpqs_2
  2044 0000614D E2F9                <1> 	loop	swpqs_1
  2045                              <1> 	; 10/06/2016
  2046 0000614F 29C0                <1> 	sub	eax, eax 
  2047 00006151 EB15                <1> 	jmp	short swpqs_6
  2048                              <1> swpqs_2:
  2049 00006153 89F7                <1> 	mov	edi, esi
  2050 00006155 83EF04              <1> 	sub 	edi, 4
  2051                              <1> swpqs_3:
  2052 00006158 66FF0D[60050300]    <1> 	dec	word [swpq_count]
  2053 0000615F 7403                <1> 	jz	short swpqs_5
  2054                              <1> swpqs_4:
  2055 00006161 49                  <1> 	dec 	ecx
  2056 00006162 F3A5                <1> 	rep	movsd	; shift up (to the head)
  2057                              <1> swpqs_5:
  2058 00006164 31C0                <1> 	xor	eax, eax
  2059 00006166 8907                <1> 	mov	[edi], eax
  2060                              <1> swpqs_6:
  2061 00006168 59                  <1> 	pop	ecx
  2062 00006169 5E                  <1> 	pop	esi
  2063 0000616A 5F                  <1> 	pop	edi
  2064                              <1> swpqs_retn:
  2065 0000616B C3                  <1> 	retn		
  2066                              <1> swpqs_7:
  2067 0000616C 89F7                <1> 	mov	edi, esi ; head
  2068 0000616E AD                  <1> 	lodsd
  2069                              <1> 	; 20/07/2015
  2070 0000616F 89C3                <1> 	mov	ebx, eax
  2071 00006171 81E300F0FFFF        <1> 	and	ebx, ~PAGE_OFF ; ~0FFFh 
  2072                              <1> 		      ; ebx = virtual address (at page boundary)	
  2073 00006177 25FF0F0000          <1> 	and	eax, PAGE_OFF ; 0FFFh
  2074                              <1> 		      ; ax = process number (1 to 4095)
  2075 0000617C 3A05[B3030300]      <1> 	cmp	al, [u.uno]
  2076                              <1> 		; Max. 16 (nproc) processes for Retro UNIX 386 v1
  2077 00006182 7507                <1> 	jne	short swpqs_8
  2078 00006184 A1[B8030300]        <1> 	mov	eax, [u.pgdir]
  2079 00006189 EB28                <1> 	jmp	short swpqs_9
  2080                              <1> swpqs_8:
  2081                              <1> 	; 09/06/2016
  2082 0000618B 80B8[AF000300]00    <1> 	cmp	byte [eax+p.stat-1], 0
  2083 00006192 76C4                <1> 	jna	short swpqs_3     ; free (or terminated) process
  2084 00006194 80B8[AF000300]02    <1> 	cmp	byte [eax+p.stat-1], 2 ; waiting
  2085 0000619B 77BB                <1> 	ja	short swpqs_3 	  ; zombie (3) or undefined ?	
  2086                              <1> 
  2087                              <1> 	;shl	ax, 2
  2088 0000619D C0E002              <1> 	shl	al, 2
  2089 000061A0 8B80[BC000300]      <1> 	mov 	eax, [eax+p.upage-4]
  2090 000061A6 09C0                <1> 	or	eax, eax
  2091 000061A8 74AE                <1> 	jz	short swpqs_3 ; invalid upage
  2092 000061AA 83C05C              <1> 	add	eax, u.pgdir - user
  2093                              <1> 			 ; u.pgdir value for the process
  2094                              <1> 			 ; is in [eax]
  2095 000061AD 8B00                <1> 	mov	eax, [eax]
  2096 000061AF 21C0                <1> 	and	eax, eax
  2097 000061B1 74A5                <1> 	jz	short swpqs_3 ; invalid page directory
  2098                              <1> swpqs_9:
  2099 000061B3 52                  <1> 	push	edx
  2100                              <1> 	; eax = page directory
  2101                              <1> 	; ebx = virtual address
  2102 000061B4 E82BFBFFFF          <1> 	call	get_pte
  2103 000061B9 89D3                <1> 	mov	ebx, edx	; PTE address
  2104 000061BB 5A                  <1> 	pop	edx
  2105                              <1> 	; 10/06/2016
  2106 000061BC 723A                <1> 	jc	short swpqs_13 ; empty PDE
  2107                              <1> 	; EAX = PTE value
  2108 000061BE A801                <1> 	test	al, PTE_A_PRESENT ; bit 0 = 1
  2109 000061C0 7436                <1> 	jz	short swpqs_13  ; Drop non-present page
  2110                              <1> 			        ; from the queue (head)
  2111 000061C2 A802                <1> 	test	al, PTE_A_WRITE	; bit 1 = 0 (read only)
  2112 000061C4 7432                <1> 	jz	short swpqs_13  ; Drop read only page
  2113                              <1> 			        ; from the queue (head) 	
  2114                              <1> 	;test	al, PTE_A_ACCESS ; bit 5 = 1 (Accessed)
  2115                              <1> 	;jnz	short swpqs_11  ; present
  2116                              <1> 			        ; accessed page
  2117 000061C6 0FBAF005            <1>         btr     eax, PTE_A_ACCESS_BIT ; reset 'accessed' bit
  2118 000061CA 7210                <1> 	jc	short swpqs_11  ; accessed page
  2119                              <1> 
  2120 000061CC 49                  <1> 	dec	ecx
  2121 000061CD 66890D[60050300]    <1> 	mov	[swpq_count], cx
  2122 000061D4 7402                <1>         jz      short swpqs_10
  2123                              <1> 		; esi = head + 4
  2124                              <1> 		; edi = head
  2125 000061D6 F3A5                <1> 	rep	movsd	 ; n = 1 to k-1, [n - 1] = [n]
  2126                              <1> swpqs_10:
  2127 000061D8 890F                <1> 	mov	[edi], ecx ; 0
  2128 000061DA EB8C                <1> 	jmp	short swpqs_6 ; 26/03/2017
  2129                              <1> 
  2130                              <1> swpqs_11:
  2131 000061DC 8903                <1> 	mov	[ebx], eax     ; save changed attribute
  2132                              <1> 	; Rotation (head -> tail)
  2133 000061DE 49                  <1> 	dec	ecx     ; entry count -> last entry number		
  2134 000061DF 74F7                <1> 	jz	short swpqs_10
  2135                              <1> 		; esi = head + 4
  2136                              <1> 		; edi = head
  2137 000061E1 8B07                <1> 	mov	eax, [edi] ; 20/07/2015
  2138 000061E3 F3A5                <1> 	rep	movsd	 ; n = 1 to k-1, [n - 1] = [n]
  2139 000061E5 8907                <1> 	mov	[edi], eax ; head -> tail ; [k] = [1]
  2140                              <1> 
  2141 000061E7 668B0D[60050300]    <1> 	mov	cx, [swpq_count]
  2142                              <1> 
  2143                              <1> swpqs_12:
  2144 000061EE BE00E00800          <1> 	mov	esi, swap_queue ; head
  2145 000061F3 E974FFFFFF          <1>         jmp     swpqs_7
  2146                              <1> 
  2147                              <1> swpqs_13:
  2148 000061F8 49                  <1> 	dec	ecx
  2149 000061F9 66890D[60050300]    <1> 	mov	[swpq_count], cx
  2150 00006200 0F845EFFFFFF        <1>         jz      swpqs_5
  2151 00006206 EBE6                <1> 	jmp	short swpqs_12
  2152                              <1> 
  2153                              <1> add_to_swap_queue:
  2154                              <1> ; temporary - 16/09/2015
  2155 00006208 C3                  <1> retn
  2156                              <1> 	; 20/02/2017
  2157                              <1> 	; 20/07/2015
  2158                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2159                              <1> 	;
  2160                              <1> 	; Adds new page to swap queue
  2161                              <1> 	; (page directories and page tables must not be added
  2162                              <1> 	; to swap queue)	
  2163                              <1> 	;
  2164                              <1> 	; INPUT ->
  2165                              <1> 	;	EBX = Linear (Virtual) addr for current process
  2166                              <1> 	;	[u.uno]
  2167                              <1> 	;	20/02/2017
  2168                              <1> 	;	(Linear address = CORE + user's virtual address)
  2169                              <1> 	;
  2170                              <1> 	; OUTPUT ->
  2171                              <1> 	;	EAX = [swpq_count]
  2172                              <1> 	;	      (after the PTE has been added)
  2173                              <1> 	;	EAX = 0 -> Swap queue is full, (1024 entries)
  2174                              <1> 	;	      the PTE could not be added.
  2175                              <1> 	;
  2176                              <1> 	; Modified Registers -> EAX
  2177                              <1> 	;
  2178 00006209 53                  <1> 	push	ebx
  2179 0000620A 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  2180 0000620F 8A1D[B3030300]      <1> 	mov	bl, [u.uno] ; current process number
  2181 00006215 E814FFFFFF          <1> 	call	swap_queue_shift ; drop from the queue if
  2182                              <1> 				 ; it is already on the queue
  2183                              <1> 		; then add it to the tail of the queue
  2184 0000621A 0FB705[60050300]    <1> 	movzx	eax, word [swpq_count]
  2185 00006221 663D0004            <1> 	cmp	ax, 1024
  2186 00006225 7205                <1> 	jb	short atsq_1
  2187 00006227 6629C0              <1> 	sub	ax, ax
  2188 0000622A 5B                  <1> 	pop	ebx
  2189 0000622B C3                  <1> 	retn
  2190                              <1> atsq_1:
  2191 0000622C 56                  <1> 	push	esi
  2192 0000622D BE00E00800          <1> 	mov	esi, swap_queue
  2193 00006232 6621C0              <1> 	and	ax, ax
  2194 00006235 740A                <1> 	jz	short atsq_2
  2195 00006237 66C1E002            <1> 	shl	ax, 2	; convert to offset
  2196 0000623B 01C6                <1> 	add	esi, eax
  2197 0000623D 66C1E802            <1> 	shr	ax, 2
  2198                              <1> atsq_2:
  2199 00006241 6640                <1> 	inc	ax
  2200 00006243 891E                <1> 	mov	[esi], ebx ; Virtual address + [u.uno] combination
  2201 00006245 66A3[60050300]      <1> 	mov	[swpq_count], ax
  2202 0000624B 5E                  <1> 	pop	esi
  2203 0000624C 5B                  <1> 	pop	ebx
  2204 0000624D C3                  <1> 	retn
  2205                              <1> 
  2206                              <1> unlink_swap_block:
  2207                              <1> 	; 15/09/2015
  2208                              <1> 	; 30/04/2015
  2209                              <1> 	; 18/04/2015
  2210                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2211                              <1> 	;
  2212                              <1> 	; INPUT -> 
  2213                              <1> 	;	EAX = swap disk/file offset address
  2214                              <1> 	;	      (bit 1 to bit 31)
  2215                              <1> 	; OUTPUT ->
  2216                              <1> 	;	[swpd_free] is increased
  2217                              <1> 	;	(corresponding SWAP DISK ALLOC. TABLE bit is SET)
  2218                              <1> 	;
  2219                              <1> 	; Modified Registers -> EAX
  2220                              <1> 	;
  2221 0000624E 53                  <1> 	push	ebx
  2222 0000624F 52                  <1> 	push	edx
  2223                              <1> 	;
  2224 00006250 C1E804              <1> 	shr	eax, SECTOR_SHIFT+1  ;3+1 ; shift sector address to 
  2225                              <1> 				     ; 3 bits right
  2226                              <1> 				     ; to get swap block/page number
  2227 00006253 89C2                <1> 	mov	edx, eax
  2228                              <1> 	; 15/09/2015
  2229 00006255 C1EA03              <1> 	shr	edx, 3		     ; to get offset to S.A.T.
  2230                              <1> 				     ; (1 allocation bit = 1 page)
  2231                              <1> 				     ; (1 allocation bytes = 8 pages)
  2232 00006258 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2233                              <1> 				     ; (to get 32 bit position)			
  2234                              <1> 	;
  2235 0000625B BB00000D00          <1> 	mov	ebx, swap_alloc_table ; Swap Allocation Table address
  2236 00006260 01D3                <1> 	add	ebx, edx
  2237 00006262 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only
  2238                              <1> 				     ; (allocation bit position)	 
  2239 00006265 3B05[6E050300]      <1> 	cmp 	eax, [swpd_next]     ; is the new free block addr. lower
  2240                              <1> 				     ; than the address in 'swpd_next' ?
  2241                              <1> 				     ; (next/first free block value)		
  2242 0000626B 7305                <1> 	jnb	short uswpbl_1	     ; no	
  2243 0000626D A3[6E050300]        <1> 	mov	[swpd_next], eax     ; yes	
  2244                              <1> uswpbl_1:
  2245 00006272 0FAB03              <1> 	bts	[ebx], eax	     ; unlink/release/deallocate block
  2246                              <1> 				     ; set relevant bit to 1.
  2247                              <1> 				     ; set CF to the previous bit value	
  2248 00006275 F5                  <1> 	cmc			     ; complement carry flag	
  2249 00006276 7206                <1> 	jc	short uswpbl_2	     ; do not increase swfd_free count
  2250                              <1> 				     ; if the block is already deallocated
  2251                              <1> 				     ; before.	
  2252 00006278 FF05[6A050300]      <1>         inc     dword [swpd_free]
  2253                              <1> uswpbl_2:
  2254 0000627E 5A                  <1> 	pop	edx
  2255 0000627F 5B                  <1> 	pop	ebx
  2256 00006280 C3                  <1> 	retn
  2257                              <1> 
  2258                              <1> link_swap_block:
  2259                              <1> 	; 01/07/2015
  2260                              <1> 	; 18/04/2015
  2261                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2262                              <1> 	;
  2263                              <1> 	; INPUT -> none
  2264                              <1> 	;
  2265                              <1> 	; OUTPUT ->
  2266                              <1> 	;	EAX = OFFSET ADDRESS OF THE ALLOCATED BLOCK (4096 bytes)
  2267                              <1> 	;	      in sectors (corresponding 
  2268                              <1> 	;	      SWAP DISK ALLOCATION TABLE bit is RESET)
  2269                              <1> 	;
  2270                              <1> 	;	CF = 1 and EAX = 0 
  2271                              <1> 	; 		   if there is not a free block to be allocated	
  2272                              <1> 	;
  2273                              <1> 	; Modified Registers -> none (except EAX)
  2274                              <1> 	;
  2275                              <1> 
  2276                              <1> 	;mov	eax, [swpd_free]
  2277                              <1> 	;and	eax, eax
  2278                              <1> 	;jz	short out_of_swpspc
  2279                              <1> 	;
  2280 00006281 53                  <1> 	push	ebx
  2281 00006282 51                  <1> 	push	ecx
  2282                              <1> 	;
  2283 00006283 BB00000D00          <1> 	mov	ebx, swap_alloc_table ; Swap Allocation Table offset
  2284 00006288 89D9                <1> 	mov	ecx, ebx
  2285 0000628A 031D[6E050300]      <1> 	add	ebx, [swpd_next] ; Free block searching starts from here
  2286                              <1> 				 ; next_free_swap_block >> 5
  2287 00006290 030D[72050300]      <1> 	add	ecx, [swpd_last] ; Free block searching ends here
  2288                              <1> 				 ; (total_swap_blocks - 1) >> 5
  2289                              <1> lswbl_scan:
  2290 00006296 39CB                <1> 	cmp	ebx, ecx
  2291 00006298 770A                <1> 	ja	short lswbl_notfound
  2292                              <1> 	;
  2293 0000629A 0FBC03              <1> 	bsf	eax, [ebx] ; Scans source operand for first bit set (1).
  2294                              <1> 			   ; Clears ZF if a bit is found set (1) and 
  2295                              <1> 			   ; loads the destination with an index to
  2296                              <1> 			   ; first set bit. (0 -> 31) 
  2297                              <1> 			   ; Sets ZF to 1 if no bits are found set.
  2298                              <1> 	; 01/07/2015
  2299 0000629D 751C                <1> 	jnz	short lswbl_found ; ZF = 0 -> a free block has been found
  2300                              <1> 			 ;
  2301                              <1> 			 ; NOTE:  a Swap Disk Allocation Table bit 
  2302                              <1> 			 ;	  with value of 1 means 
  2303                              <1> 			 ;	  the corresponding page is free 
  2304                              <1> 			 ;	  (Retro UNIX 386 v1 feaure only!)
  2305 0000629F 83C304              <1> 	add	ebx, 4
  2306                              <1> 			 ; We return back for searching next page block
  2307                              <1> 			 ; NOTE: [swpd_free] is not ZERO; so, 
  2308                              <1> 			 ;	 we always will find at least 1 free block here.
  2309 000062A2 EBF2                <1> 	jmp    	short lswbl_scan
  2310                              <1> 	;
  2311                              <1> lswbl_notfound:	
  2312 000062A4 81E900000D00        <1> 	sub	ecx, swap_alloc_table
  2313 000062AA 890D[6E050300]      <1> 	mov	[swpd_next], ecx ; next/first free page = last page 
  2314                              <1> 				 ; (unlink_swap_block procedure will change it)
  2315 000062B0 31C0                <1> 	xor	eax, eax
  2316 000062B2 A3[6A050300]        <1> 	mov	[swpd_free], eax
  2317 000062B7 F9                  <1> 	stc
  2318                              <1> lswbl_ok:
  2319 000062B8 59                  <1> 	pop	ecx
  2320 000062B9 5B                  <1> 	pop	ebx
  2321 000062BA C3                  <1> 	retn
  2322                              <1> 	;
  2323                              <1> ;out_of_swpspc:
  2324                              <1> ;	stc
  2325                              <1> ;	retn
  2326                              <1> 
  2327                              <1> lswbl_found:
  2328 000062BB 89D9                <1> 	mov	ecx, ebx
  2329 000062BD 81E900000D00        <1> 	sub	ecx, swap_alloc_table
  2330 000062C3 890D[6E050300]      <1> 	mov	[swpd_next], ecx ; Set first free block searching start
  2331                              <1> 				 ; address/offset (to the next)
  2332 000062C9 FF0D[6A050300]      <1>         dec     dword [swpd_free] ; 1 block has been allocated (X = X-1) 
  2333                              <1> 	;
  2334 000062CF 0FB303              <1> 	btr	[ebx], eax	 ; The destination bit indexed by the source value
  2335                              <1> 				 ; is copied into the Carry Flag and then cleared
  2336                              <1> 				 ; in the destination.
  2337                              <1> 				 ;
  2338                              <1> 				 ; Reset the bit which is corresponding to the 
  2339                              <1> 				 ; (just) allocated block.
  2340 000062D2 C1E105              <1> 	shl	ecx, 5		 ; (block offset * 32) + block index
  2341 000062D5 01C8                <1> 	add	eax, ecx	 ; = block number
  2342 000062D7 C1E003              <1> 	shl	eax, SECTOR_SHIFT ; 3, sector (offset) address of the block
  2343                              <1> 				 ; 1 block =  8 sectors
  2344                              <1> 	;
  2345                              <1> 	; EAX = offset address of swap disk/file sector (beginning of the block)
  2346                              <1> 	;
  2347                              <1> 	; NOTE: The relevant page table entry will be updated
  2348                              <1> 	;       according to this EAX value...
  2349                              <1> 	;
  2350 000062DA EBDC                <1> 	jmp	short lswbl_ok
  2351                              <1> 
  2352                              <1> logical_disk_read:
  2353                              <1> 	; 20/07/2015
  2354                              <1> 	; 09/03/2015 (temporary code here)
  2355                              <1> 	;
  2356                              <1> 	; INPUT ->
  2357                              <1> 	; 	ESI = Logical disk description table address
  2358                              <1> 	; 	EBX = Memory page (buffer) address (physical!)
  2359                              <1> 	; 	EAX = Sector adress (offset address, logical sector number)
  2360                              <1> 	; 	ECX = Sector count
  2361                              <1> 	;
  2362                              <1> 	;
  2363 000062DC C3                  <1> 	retn
  2364                              <1> 
  2365                              <1> logical_disk_write:
  2366                              <1> 	; 20/07/2015
  2367                              <1> 	; 09/03/2015 (temporary code here)
  2368                              <1> 	;
  2369                              <1> 	; INPUT ->
  2370                              <1> 	; 	ESI = Logical disk description table address
  2371                              <1> 	; 	EBX = Memory page (buffer) address (physical!)
  2372                              <1> 	; 	EAX = Sector adress (offset address, logical sector number)
  2373                              <1> 	; 	ECX = Sector count
  2374                              <1> 	;
  2375 000062DD C3                  <1> 	retn
  2376                              <1> 
  2377                              <1> get_physical_addr:
  2378                              <1> 	; 26/03/2017
  2379                              <1> 	; 20/02/2017
  2380                              <1> 	; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
  2381                              <1> 	; 18/10/2015
  2382                              <1> 	; 29/07/2015
  2383                              <1> 	; 20/07/2015
  2384                              <1> 	; 04/06/2015
  2385                              <1> 	; 20/05/2015
  2386                              <1> 	; 28/04/2015
  2387                              <1> 	; 18/04/2015
  2388                              <1> 	; Get physical address
  2389                              <1> 	;     (allocates a new page for user if it is not present)
  2390                              <1> 	;	
  2391                              <1> 	; (This subroutine is needed for mapping user's virtual 
  2392                              <1> 	; (buffer) address to physical address (of the buffer).)
  2393                              <1> 	; ('sys write', 'sys read' system calls...)
  2394                              <1> 	;
  2395                              <1> 	; INPUT ->
  2396                              <1> 	;	EBX = virtual address
  2397                              <1> 	;	u.pgdir = page directory (physical) address
  2398                              <1> 	;
  2399                              <1> 	; OUTPUT ->
  2400                              <1> 	;	EAX = physical address 
  2401                              <1> 	;	EBX = linear address	
  2402                              <1> 	;	EDX = physical address of the page frame
  2403                              <1> 	;	      (with attribute bits)
  2404                              <1> 	;	ECX = byte count within the page frame
  2405                              <1> 	;
  2406                              <1> 	; Modified Registers -> EAX, EBX, ECX, EDX
  2407                              <1> 	;
  2408 000062DE 81C300004000        <1> 	add	ebx, CORE ; 18/10/2015
  2409                              <1> get_physical_addr_x: ; 27/05/2016
  2410 000062E4 A1[B8030300]        <1> 	mov	eax, [u.pgdir]
  2411 000062E9 E8F6F9FFFF          <1> 	call	get_pte
  2412                              <1> 		; EDX = Page table entry address (if CF=0)
  2413                              <1> 	        ;       Page directory entry address (if CF=1)
  2414                              <1> 		;       (Bit 0 value is 0 if PT is not present)
  2415                              <1> 		; EAX = Page table entry value (page address)
  2416                              <1> 		;	CF = 1 -> PDE not present or invalid ? 
  2417 000062EE 731C                <1> 	jnc	short gpa_1
  2418                              <1> 	;
  2419 000062F0 E8D4F8FFFF          <1> 	call	allocate_page
  2420 000062F5 7248                <1> 	jc	short gpa_im_err  ; 'insufficient memory' error
  2421                              <1> gpa_0:
  2422 000062F7 E847F9FFFF          <1> 	call 	clear_page
  2423                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  2424 000062FC 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER ; 4+2+1 = 7
  2425                              <1> 			   ; lower 3 bits are used as U/S, R/W, P flags
  2426                              <1> 			   ; (user, writable, present page)	
  2427 000062FE 8902                <1> 	mov	[edx], eax ; Let's put the new page directory entry here !
  2428 00006300 A1[B8030300]        <1> 	mov	eax, [u.pgdir]	
  2429 00006305 E8DAF9FFFF          <1> 	call	get_pte
  2430 0000630A 7233                <1> 	jc	short gpa_im_err ; 'insufficient memory' error
  2431                              <1> gpa_1:
  2432                              <1> 	; EAX = PTE value, EDX = PTE address
  2433 0000630C A801                <1> 	test 	al, PTE_A_PRESENT
  2434 0000630E 751F                <1> 	jnz	short gpa_3 ; 26/03/2017
  2435 00006310 09C0                <1> 	or	eax, eax
  2436 00006312 7456                <1> 	jz	short gpa_7  ; Allocate a new page
  2437                              <1> 	; 20/07/2015
  2438 00006314 55                  <1> 	push	ebp
  2439 00006315 89DD                <1> 	mov	ebp, ebx ; virtual (linear) address
  2440                              <1> 	; reload swapped page
  2441 00006317 E878000000          <1> 	call	reload_page ; 28/04/2015
  2442 0000631C 5D                  <1> 	pop	ebp
  2443 0000631D 724A                <1> 	jc	short gpa_retn
  2444                              <1> gpa_2:
  2445                              <1> 	; 26/03/2017
  2446                              <1> 	; 20/02/2017
  2447                              <1> 	; If a page will contain a Signal Response Byte
  2448                              <1> 	; it must not be swapped out, because
  2449                              <1> 	; timer service or irq callback service
  2450                              <1> 	; will write a signal return/response byte 
  2451                              <1> 	; directly by using physical address of Signal
  2452                              <1> 	; Response Byte.(Even if process is not running,
  2453                              <1> 	; or it is running with swapped out pages.)
  2454                              <1> 	;
  2455                              <1> 	; 'no_page_swap' will be set by 'systimer' or
  2456                              <1> 	; 'syscalbac' sistem functions/calls. (*)
  2457                              <1> 	;
  2458 0000631F 803D[62930100]00    <1> 	cmp	byte [no_page_swap], 0
  2459 00006326 761D                <1> 	jna	short gpa_4 ; this page can be swapped out
  2460                              <1> 	; this page must not be swapped out
  2461                              <1> 	; but 'no_page_swap' must be reset here
  2462                              <1> 	; imediately for other callers (*)
  2463                              <1> 	; (otherwise, swap queue would not be long enough) 
  2464 00006328 E84B000000          <1> 	call	gpa_8 ; 26/03/2017
  2465 0000632D EB1D                <1> 	jmp	short gpa_5
  2466                              <1> gpa_3: 
  2467                              <1> 	; 26/03/2017
  2468 0000632F 803D[62930100]00    <1> 	cmp	byte [no_page_swap], 0
  2469 00006336 7618                <1> 	jna	short gpa_6 ; this page can be swapped out
  2470 00006338 E83B000000          <1> 	call	gpa_8
  2471 0000633D EB11                <1> 	jmp	short gpa_6
  2472                              <1> 
  2473                              <1> gpa_im_err:	
  2474 0000633F B804000000          <1> 	mov	eax, ERR_MINOR_IM ; Insufficient memory (minor) error!
  2475                              <1> 				  ; Major error = 0 (No protection fault)	
  2476 00006344 C3                  <1> 	retn
  2477                              <1> gpa_4:
  2478                              <1> 	; 20/07/2015
  2479                              <1> 	; 20/05/2015
  2480                              <1> 	; add this page to swap queue
  2481 00006345 50                  <1> 	push	eax 
  2482                              <1> 	; EBX = Linear (CORE+virtual) address ; 20/02/2017 
  2483 00006346 E8BDFEFFFF          <1> 	call 	add_to_swap_queue
  2484 0000634B 58                  <1> 	pop	eax
  2485                              <1> gpa_5:
  2486                              <1> 		; PTE address in EDX
  2487                              <1> 		; virtual address in EBX
  2488                              <1> 	; EAX = memory page address
  2489 0000634C 0C07                <1> 	or	al, PTE_A_PRESENT + PTE_A_USER + PTE_A_WRITE
  2490                              <1> 				  ; present flag, bit 0 = 1
  2491                              <1> 				  ; user flag, bit 2 = 1	
  2492                              <1> 				  ; writable flag, bit 1 = 1
  2493 0000634E 8902                <1> 	mov	[edx], eax  ; Update PTE value
  2494                              <1> gpa_6:
  2495                              <1> 	; 18/10/2015
  2496 00006350 89D9                <1> 	mov	ecx, ebx
  2497 00006352 81E1FF0F0000        <1> 	and	ecx, PAGE_OFF
  2498 00006358 89C2                <1> 	mov 	edx, eax
  2499 0000635A 662500F0            <1> 	and	ax, PTE_A_CLEAR
  2500 0000635E 01C8                <1> 	add	eax, ecx
  2501 00006360 F7D9                <1> 	neg	ecx ; 1 -> -1 (0FFFFFFFFh), 4095 (0FFFh) -> -4095
  2502 00006362 81C100100000        <1> 	add	ecx, PAGE_SIZE
  2503 00006368 F8                  <1> 	clc
  2504                              <1> gpa_retn:
  2505 00006369 C3                  <1> 	retn
  2506                              <1> gpa_7:	
  2507 0000636A E85AF8FFFF          <1> 	call	allocate_page
  2508 0000636F 72CE                <1> 	jc	short gpa_im_err ; 'insufficient memory' error
  2509 00006371 E8CDF8FFFF          <1> 	call	clear_page
  2510 00006376 EBA7                <1> 	jmp	short gpa_2
  2511                              <1> 
  2512                              <1> gpa_8: ; 26/03/2017
  2513 00006378 C605[62930100]00    <1> 	mov	byte [no_page_swap], 0
  2514 0000637F 53                  <1> 	push	ebx
  2515 00006380 50                  <1> 	push	eax ; 26/03/2017
  2516 00006381 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  2517 00006386 8A1D[B3030300]      <1> 	mov	bl, [u.uno] ; current process number
  2518 0000638C E89DFDFFFF          <1> 	call	swap_queue_shift ; drop from the queue if
  2519                              <1> 				 ; it is already on the queue
  2520 00006391 58                  <1> 	pop	eax ; 26/03/2017
  2521 00006392 5B                  <1> 	pop	ebx
  2522 00006393 C3                  <1> 	retn
  2523                              <1> 
  2524                              <1> reload_page:
  2525                              <1> 	; 20/07/2015
  2526                              <1> 	; 28/04/2015 (Retro UNIX 386 v1 - beginning)
  2527                              <1> 	;
  2528                              <1> 	; Reload (Restore) swapped page at memory
  2529                              <1> 	;
  2530                              <1> 	; INPUT -> 
  2531                              <1> 	;	EBP = Virtual (linear) memory address
  2532                              <1> 	;	EAX = PTE value (swap disk sector address)
  2533                              <1> 	;	(Swap disk sector address = bit 1 to bit 31 of EAX)	
  2534                              <1> 	; OUTPUT ->
  2535                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF RELOADED PAGE
  2536                              <1> 	;
  2537                              <1> 	;	CF = 1 and EAX = error code
  2538                              <1> 	;
  2539                              <1> 	; Modified Registers -> none (except EAX)
  2540                              <1> 	;
  2541 00006394 D1E8                <1> 	shr	eax, 1   ; Convert PTE value to swap disk address 
  2542 00006396 53                  <1> 	push	ebx      ;
  2543 00006397 89C3                <1> 	mov	ebx, eax ; Swap disk (offset) address	
  2544 00006399 E82BF8FFFF          <1> 	call	allocate_page
  2545 0000639E 720C                <1> 	jc	short rlp_im_err
  2546 000063A0 93                  <1> 	xchg 	eax, ebx	
  2547                              <1> 	; EBX = Physical memory (page) address
  2548                              <1> 	; EAX = Swap disk (offset) address
  2549                              <1> 	; EBP = Virtual (linear) memory address
  2550 000063A1 E862FCFFFF          <1> 	call	swap_in
  2551 000063A6 720B                <1> 	jc	short rlp_swp_err  ; (swap disk/file read error)
  2552 000063A8 89D8                <1> 	mov	eax, ebx	
  2553                              <1> rlp_retn:
  2554 000063AA 5B                  <1> 	pop	ebx
  2555 000063AB C3                  <1> 	retn
  2556                              <1> 	
  2557                              <1> rlp_im_err:	
  2558 000063AC B804000000          <1> 	mov	eax, ERR_MINOR_IM ; Insufficient memory (minor) error!
  2559                              <1> 				  ; Major error = 0 (No protection fault)	
  2560 000063B1 EBF7                <1> 	jmp	short rlp_retn
  2561                              <1> 
  2562                              <1> rlp_swp_err:
  2563 000063B3 B828000000          <1> 	mov 	eax, SWP_DISK_READ_ERR ; Swap disk read error !
  2564 000063B8 EBF0                <1> 	jmp	short rlp_retn
  2565                              <1> 
  2566                              <1> 
  2567                              <1> copy_page_dir:
  2568                              <1> 	; 19/09/2015
  2569                              <1> 	; temporary - 07/09/2015
  2570                              <1> 	; 07/09/2015 (Retro UNIX 386 v1 - beginning)
  2571                              <1> 	;
  2572                              <1> 	; INPUT -> 
  2573                              <1> 	;	[u.pgdir] = PHYSICAL (real/flat) ADDRESS of the parent's
  2574                              <1> 	;		    page directory.
  2575                              <1> 	; OUTPUT ->
  2576                              <1> 	;	EAX =  PHYSICAL (real/flat) ADDRESS of the child's
  2577                              <1> 	;	       page directory.
  2578                              <1> 	;	(New page directory with new page table entries.)
  2579                              <1> 	;	(New page tables with read only copies of the parent's
  2580                              <1> 	;	pages.)
  2581                              <1> 	;	EAX = 0 -> Error (CF = 1)
  2582                              <1> 	;
  2583                              <1> 	; Modified Registers -> none (except EAX)
  2584                              <1> 	;
  2585 000063BA E80AF8FFFF          <1> 	call	allocate_page
  2586 000063BF 723E                <1> 	jc	short cpd_err
  2587                              <1> 	;
  2588 000063C1 55                  <1> 	push	ebp ; 20/07/2015
  2589 000063C2 56                  <1> 	push	esi
  2590 000063C3 57                  <1> 	push	edi
  2591 000063C4 53                  <1> 	push	ebx
  2592 000063C5 51                  <1> 	push	ecx
  2593 000063C6 8B35[B8030300]      <1> 	mov	esi, [u.pgdir]
  2594 000063CC 89C7                <1> 	mov	edi, eax
  2595 000063CE 50                  <1> 	push	eax ; save child's page directory address
  2596                              <1> 	; copy PDE 0 from the parent's page dir to the child's page dir
  2597                              <1> 	; (use same system space for all user page tables) 
  2598 000063CF A5                  <1> 	movsd
  2599 000063D0 BD00004000          <1> 	mov	ebp, 1024*4096 ; pass the 1st 4MB (system space)
  2600 000063D5 B9FF030000          <1> 	mov	ecx, (PAGE_SIZE / 4) - 1 ; 1023
  2601                              <1> cpd_0:	
  2602 000063DA AD                  <1> 	lodsd
  2603                              <1> 	;or	eax, eax
  2604                              <1>         ;jnz     short cpd_1
  2605 000063DB A801                <1> 	test	al, PDE_A_PRESENT ;  bit 0 =  1
  2606 000063DD 7508                <1> 	jnz	short cpd_1
  2607                              <1>  	; (virtual address at the end of the page table)	
  2608 000063DF 81C500004000        <1> 	add	ebp, 1024*4096 ; page size * PTE count
  2609 000063E5 EB0F                <1> 	jmp	short cpd_2
  2610                              <1> cpd_1:	
  2611 000063E7 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear attribute bits
  2612 000063EB 89C3                <1> 	mov	ebx, eax
  2613                              <1> 	; EBX = Parent's page table address
  2614 000063ED E81F000000          <1> 	call	copy_page_table
  2615 000063F2 720C                <1> 	jc	short cpd_p_err
  2616                              <1> 	; EAX = Child's page table address
  2617 000063F4 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER
  2618                              <1> 			 ; set bit 0, bit 1 and bit 2 to 1
  2619                              <1> 			 ; (present, writable, user)
  2620                              <1> cpd_2:
  2621 000063F6 AB                  <1> 	stosd
  2622 000063F7 E2E1                <1> 	loop	cpd_0
  2623                              <1> 	;
  2624 000063F9 58                  <1> 	pop	eax  ; restore child's page directory address
  2625                              <1> cpd_3:
  2626 000063FA 59                  <1> 	pop	ecx
  2627 000063FB 5B                  <1> 	pop	ebx
  2628 000063FC 5F                  <1> 	pop	edi
  2629 000063FD 5E                  <1> 	pop	esi
  2630 000063FE 5D                  <1> 	pop	ebp
  2631                              <1> cpd_err:
  2632 000063FF C3                  <1> 	retn
  2633                              <1> cpd_p_err:
  2634                              <1> 	; release the allocated pages missing (recover free space)
  2635 00006400 58                  <1> 	pop	eax  ; the new page directory address (physical)
  2636 00006401 8B1D[B8030300]      <1> 	mov	ebx, [u.pgdir] ; parent's page directory address 
  2637 00006407 E8F6F8FFFF          <1> 	call 	deallocate_page_dir
  2638 0000640C 29C0                <1> 	sub	eax, eax ; 0
  2639 0000640E F9                  <1> 	stc
  2640 0000640F EBE9                <1> 	jmp	short cpd_3	
  2641                              <1> 
  2642                              <1> copy_page_table:
  2643                              <1> 	; 19/09/2015
  2644                              <1> 	; temporary - 07/09/2015
  2645                              <1> 	; 07/09/2015 (Retro UNIX 386 v1 - beginning)
  2646                              <1> 	;
  2647                              <1> 	; INPUT -> 
  2648                              <1> 	;	EBX = PHYSICAL (real/flat) ADDRESS of the parent's page table.
  2649                              <1> 	;	EBP = page table entry index (from 'copy_page_dir')
  2650                              <1> 	; OUTPUT ->
  2651                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS of the child's page table.
  2652                              <1> 	;	EBP = (recent) page table index (for 'add_to_swap_queue')	
  2653                              <1> 	;	CF = 1 -> error 
  2654                              <1> 	;
  2655                              <1> 	; Modified Registers -> EBP (except EAX)
  2656                              <1> 	;
  2657 00006411 E8B3F7FFFF          <1> 	call	allocate_page
  2658 00006416 725A                <1> 	jc	short cpt_err
  2659                              <1> 	;
  2660 00006418 50                  <1> 	push	eax ; *
  2661                              <1> 	;push 	ebx
  2662 00006419 56                  <1> 	push	esi
  2663 0000641A 57                  <1> 	push	edi
  2664 0000641B 52                  <1> 	push	edx
  2665 0000641C 51                  <1> 	push	ecx
  2666                              <1> 	;
  2667 0000641D 89DE                <1> 	mov	esi, ebx
  2668 0000641F 89C7                <1> 	mov	edi, eax
  2669 00006421 89C2                <1> 	mov	edx, eax
  2670 00006423 81C200100000        <1> 	add	edx, PAGE_SIZE 	
  2671                              <1> cpt_0:
  2672 00006429 AD                  <1> 	lodsd
  2673 0000642A A801                <1> 	test	al, PTE_A_PRESENT ;  bit 0 =  1
  2674 0000642C 750B                <1> 	jnz	short cpt_1
  2675 0000642E 21C0                <1> 	and	eax, eax
  2676 00006430 7430                <1> 	jz	short cpt_2
  2677                              <1> 	; ebp = virtual (linear) address of the memory page
  2678 00006432 E85DFFFFFF          <1> 	call	reload_page ; 28/04/2015
  2679 00006437 7234                <1> 	jc	short cpt_p_err
  2680                              <1> cpt_1:
  2681 00006439 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  2682 0000643D 89C1                <1> 	mov	ecx, eax
  2683                              <1> 	; Allocate a new page for the child process
  2684 0000643F E885F7FFFF          <1> 	call	allocate_page
  2685 00006444 7227                <1> 	jc	short cpt_p_err
  2686 00006446 57                  <1> 	push	edi
  2687 00006447 56                  <1> 	push	esi
  2688 00006448 89CE                <1> 	mov	esi, ecx
  2689 0000644A 89C7                <1> 	mov	edi, eax
  2690 0000644C B900040000          <1> 	mov	ecx, PAGE_SIZE/4
  2691 00006451 F3A5                <1> 	rep	movsd	; copy page (4096 bytes)
  2692 00006453 5E                  <1> 	pop	esi
  2693 00006454 5F                  <1> 	pop	edi
  2694                              <1> 	; 
  2695 00006455 53                  <1> 	push	ebx
  2696 00006456 50                  <1> 	push	eax
  2697 00006457 89EB                <1> 	mov	ebx, ebp
  2698                              <1> 	; ebx = virtual address of the memory page
  2699 00006459 E8AAFDFFFF          <1> 	call	add_to_swap_queue
  2700 0000645E 58                  <1> 	pop	eax
  2701 0000645F 5B                  <1> 	pop	ebx
  2702                              <1> 	;
  2703                              <1> 	;or	ax, PTE_A_USER+PTE_A_PRESENT 
  2704 00006460 0C07                <1> 	or	al, PTE_A_USER+PTE_A_WRITE+PTE_A_PRESENT 
  2705                              <1> cpt_2:
  2706 00006462 AB                  <1> 	stosd  ; EDI points to child's PTE  	 
  2707                              <1> 	;
  2708 00006463 81C500100000        <1> 	add	ebp, 4096 ; 20/07/2015 (next page)
  2709                              <1> 	;
  2710 00006469 39D7                <1> 	cmp	edi, edx
  2711 0000646B 72BC                <1> 	jb	short cpt_0
  2712                              <1> cpt_p_err:
  2713 0000646D 59                  <1> 	pop	ecx
  2714 0000646E 5A                  <1> 	pop	edx
  2715 0000646F 5F                  <1> 	pop	edi
  2716 00006470 5E                  <1> 	pop	esi
  2717                              <1> 	;pop	ebx
  2718 00006471 58                  <1> 	pop	eax ; *
  2719                              <1> cpt_err:
  2720 00006472 C3                  <1> 	retn
  2721                              <1> 
  2722                              <1> allocate_memory_block:
  2723                              <1> 	; 01/05/2017
  2724                              <1> 	; 28/04/2017
  2725                              <1> 	; 25/04/2017
  2726                              <1> 	; 01/04/2016, 02/04/2016, 03/04/2016
  2727                              <1> 	; 13/03/2016, 14/03/2016
  2728                              <1> 	; 12/03/2016 (TRDOS 386 = TRDOS v2.0)
  2729                              <1> 	; Allocating contiguous memory pages (in the kernel's memory space)
  2730                              <1> 	;
  2731                              <1> 	; INPUT -> 
  2732                              <1> 	;	EAX = Beginning address (physical)
  2733                              <1> 	;	EAX = 0 -> Allocate memory block from the first proper aperture	
  2734                              <1> 	;	ECX = Number of bytes to be allocated
  2735                              <1> 	;
  2736                              <1> 	; OUTPUT ->
  2737                              <1> 	; 	1) cf = 0 -> successful
  2738                              <1> 	;	EAX = Beginning (physical) address of the allocated memory block
  2739                              <1> 	;	ECX = Number of allocated bytes (rounded up to page borders) 
  2740                              <1> 	;	2) cf = 1 -> unsuccessful
  2741                              <1> 	;	 2.1) If EAX > 0 -> 
  2742                              <1> 	;	      (Number of requested pages is more than # of free pages
  2743                              <1> 	;	       but contiguous free pages -the aperture- is not enough!)	   	
  2744                              <1> 	;	      EAX = Beginning address of available aperture
  2745                              <1> 	;		    (one of all aperture with max. aperture size/length)		
  2746                              <1> 	;	      ECX = Size of available aperture (memory block) in bytes
  2747                              <1> 	;	 2.2) If EAX = 0 -> Out of memory error 
  2748                              <1> 	;	            (number of free pages is less than requested number)
  2749                              <1> 	;	      ECX = Total number of free bytes (free pages * 4096) 
  2750                              <1> 	;		    (It is not number of contiguous free bytes)	
  2751                              <1> 	;
  2752                              <1> 	; (Modified Registers -> EAX, ECX)
  2753                              <1> 	;
  2754                              <1> 	; PURPOSE: Loading a file at memory for copying or running etc.
  2755                              <1> 	; If this procedure returns with cf is set, ECX contains maximum
  2756                              <1> 	; available space and EAX contains the beginning address of it.
  2757                              <1> 	; If EAX has zero, ECX contains total number of free bytes.
  2758                              <1> 	; If requested block has been successfully allocated (by rounding up to
  2759                              <1> 	; the last page border), it must be deallocated later by using
  2760                              <1> 	; 'deallocate_memory_block' procedure.    
  2761                              <1> 
  2762 00006473 52                  <1> 	push	edx ; *
  2763 00006474 BAFF0F0000          <1> 	mov	edx, PAGE_SIZE - 1   ; 4095
  2764 00006479 01D0                <1> 	add	eax, edx
  2765 0000647B 01D1                <1> 	add	ecx, edx
  2766 0000647D C1E90C              <1> 	shr	ecx, PAGE_SHIFT	     ; 12
  2767                              <1> 
  2768                              <1> 	; ECX = number of contiguous pages to be allocated
  2769 00006480 8B15[98810100]      <1> 	mov	edx, [free_pages]
  2770                              <1> 	; 01/05/2017
  2771                              <1> 	;or	ecx, ecx
  2772                              <1> 	;jz	short amb3
  2773                              <1> 	; If ECX=0, set cf to 1 and return with max. available mem block size
  2774                              <1> 
  2775 00006486 39D1                <1> 	cmp	ecx, edx
  2776 00006488 7760                <1> 	ja	short amb_3
  2777                              <1> 
  2778 0000648A C1E80C              <1> 	shr	eax, PAGE_SHIFT      ; 12
  2779                              <1> 
  2780 0000648D 89C2                <1> 	mov	edx, eax 	     ; page number
  2781 0000648F C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  2782                              <1> 				     ; (1 allocation bit = 1 page)
  2783                              <1> 				     ; (1 allocation bytes = 8 pages)
  2784 00006492 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2785                              <1> 				     ; (to get 32 bit position)	
  2786 00006495 53                  <1> 	push	ebx ; **
  2787                              <1> amb_0:
  2788 00006496 890D[4C8D0100]      <1> 	mov	[mem_ipg_count], ecx ; initial (reset) value of page count
  2789 0000649C 890D[508D0100]      <1> 	mov	[mem_pg_count], ecx
  2790 000064A2 31C9                <1> 	xor	ecx, ecx ; 0
  2791 000064A4 890D[548D0100]      <1> 	mov	[mem_aperture], ecx ; 0
  2792 000064AA 890D[588D0100]      <1> 	mov	[mem_max_aperture], ecx ; 0
  2793                              <1> 	
  2794 000064B0 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table address.
  2795 000064B5 3B15[9C810100]      <1> 	cmp	edx, [next_page]     ; Is the beginning page address lower
  2796                              <1> 				     ; than the address in 'next_page' ?
  2797                              <1> 				     ; (the first/next free page of user space)		
  2798 000064BB 7208                <1> 	jb	short amb_1
  2799 000064BD 3B15[A0810100]      <1> 	cmp 	edx, [last_page]     ; is the beginning page address higher
  2800                              <1> 				     ; than the address in 'last_page' ?
  2801                              <1> 				     ; (end of the memory)		
  2802 000064C3 7606                <1> 	jna	short amb_2	     ; no	
  2803                              <1> amb_1:
  2804 000064C5 8B15[9C810100]      <1> 	mov	edx, [next_page]     ; M.A.T. offset (1 M.A.T. byte = 8 pages)
  2805                              <1> amb_2:
  2806 000064CB 01D3                <1> 	add	ebx, edx
  2807                              <1> 
  2808                              <1> 	; 28/04/2017
  2809                              <1> 	;xor	ecx, ecx
  2810 000064CD 0FBC0B              <1> 	bsf	ecx, [ebx]	     ; 0 to 31
  2811 000064D0 89D0                <1> 	mov	eax, edx
  2812 000064D2 C1E003              <1> 	shl	eax, 3		     ; *8	
  2813 000064D5 01C8                <1> 	add	eax, ecx	     ; beginning page number
  2814                              <1> 
  2815 000064D7 A3[5C8D0100]        <1> 	mov	[mem_pg_pos], eax    ; beginning page no (for curr. mem. aperture)
  2816 000064DC A3[608D0100]        <1>  	mov	[mem_max_pg_pos], eax ; beginning page no for max. mem. aperture
  2817                              <1> 
  2818 000064E1 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only (0 to 31)
  2819                              <1> 				     ; (allocation bit position)	 
  2820 000064E4 750E                <1> 	jnz	short amb_4	     ; 0
  2821 000064E6 B120                <1> 	mov	cl, 32
  2822 000064E8 EB4B                <1> 	jmp	short amb_10
  2823                              <1> 
  2824                              <1> amb_3:	; out_of_memory
  2825 000064EA 31C0                <1> 	xor	eax, eax ; 0
  2826 000064EC 89D1                <1> 	mov	ecx, edx ; free pages
  2827 000064EE C1E10C              <1> 	shl	ecx, PAGE_SHIFT
  2828 000064F1 5A                  <1> 	pop	edx ; *
  2829 000064F2 F9                  <1> 	stc
  2830 000064F3 C3                  <1> 	retn	
  2831                              <1> amb_4:
  2832 000064F4 8B13                <1> 	mov	edx, [ebx]
  2833 000064F6 88C1                <1> 	mov	cl, al ; 1 to 31
  2834 000064F8 D3EA                <1> 	shr	edx, cl
  2835 000064FA 89D0                <1> 	mov	eax, edx
  2836                              <1> amb_5:
  2837 000064FC D1E8                <1> 	shr	eax, 1 ; (***)
  2838 000064FE 7317                <1> 	jnc	short amb_7
  2839 00006500 FF05[548D0100]      <1> 	inc	dword [mem_aperture]
  2840 00006506 FF0D[508D0100]      <1> 	dec	dword [mem_pg_count]
  2841 0000650C 7470                <1> 	jz	short amb_15
  2842                              <1> amb_6:
  2843                              <1> 	; 28/04/2017
  2844 0000650E FEC1                <1> 	inc	cl
  2845 00006510 80F920              <1> 	cmp	cl, 32
  2846 00006513 730D                <1> 	jnb	short amb_9
  2847 00006515 EBE5                <1> 	jmp	short amb_5
  2848                              <1> amb_7:
  2849 00006517 50                  <1> 	push	eax ; (***) allocation bits (in shifted status)
  2850 00006518 E81B010000          <1> 	call	amb_26 ; set maximum memory aperture (free memory block size)
  2851 0000651D 58                  <1> 	pop	eax ; (***)
  2852 0000651E EBEE                <1> 	jmp	short amb_6
  2853                              <1> amb_8:
  2854                              <1> 	; 28/04/2017
  2855 00006520 B120                <1> 	mov	cl, 32
  2856                              <1> amb_9:
  2857 00006522 89DA                <1> 	mov	edx, ebx
  2858 00006524 81EA00001000        <1> 	sub	edx, MEM_ALLOC_TBL
  2859 0000652A 3B15[A0810100]      <1> 	cmp	edx, [last_page]
  2860 00006530 7336                <1> 	jnb	short amb_14 ; contiguous pages not enough
  2861 00006532 83C304              <1> 	add	ebx, 4
  2862                              <1> amb_10:
  2863 00006535 8B03                <1> 	mov	eax, [ebx]
  2864 00006537 21C0                <1> 	and 	eax, eax
  2865 00006539 7408                <1>         jz      short amb_11 ; there is not a free page bit in this alloc dword
  2866 0000653B 40                  <1> 	inc	eax ; 0FFFFFFFFh -> 0
  2867 0000653C 740C                <1> 	jz	short amb_12 ; all of bits are set (32 free pages)
  2868 0000653E 48                  <1> 	dec	eax
  2869 0000653F 28C9                <1> 	sub	cl, cl ; 0
  2870 00006541 EBB9                <1> 	jmp	short amb_5
  2871                              <1> amb_11:
  2872 00006543 E8F0000000          <1> 	call	amb_26 ; set maximum memory aperture (free memory block size)
  2873 00006548 EBD8                <1> 	jmp	short amb_9	
  2874                              <1> amb_12:
  2875 0000654A 390D[508D0100]      <1> 	cmp	[mem_pg_count], ecx ; 32
  2876 00006550 7306                <1> 	jnb	short amb_13
  2877 00006552 8B0D[508D0100]      <1> 	mov	ecx, [mem_pg_count]
  2878                              <1> amb_13:
  2879 00006558 010D[548D0100]      <1> 	add	[mem_aperture], ecx
  2880 0000655E 290D[508D0100]      <1> 	sub	[mem_pg_count], ecx
  2881 00006564 7618                <1> 	jna	short amb_15
  2882 00006566 EBBA                <1> 	jmp	short amb_9 ; 01/05/2017
  2883                              <1> amb_14:
  2884 00006568 E8CB000000          <1> 	call	amb_26 ; 28/04/2017
  2885 0000656D A1[608D0100]        <1> 	mov	eax, [mem_max_pg_pos] ; begin address of max. mem aperture	
  2886 00006572 8B0D[588D0100]      <1> 	mov	ecx, [mem_max_aperture] ; max. (largest) memory aperture
  2887 00006578 F9                  <1> 	stc
  2888 00006579 E9AF000000          <1>         jmp     amb_25
  2889                              <1> 
  2890                              <1> amb_15: ; OK !
  2891 0000657E A1[5C8D0100]        <1> 	mov	eax, [mem_pg_pos]    ; Beginning address as page number
  2892 00006583 8B0D[548D0100]      <1> 	mov	ecx, [mem_aperture]  ; Free contiguous page count (>=1)
  2893                              <1> amb_16:
  2894                              <1> 	; allocate contiguous memory pages (via memory allocation table bits)
  2895 00006589 89C2                <1> 	mov	edx, eax
  2896                              <1> 	; 25/04/2017
  2897 0000658B C1EA03              <1> 	shr	edx, 3		 ; 8 pages in one allocation byte
  2898 0000658E 80E2FC              <1> 	and	dl, 0FCh	 ; clear lower 2 bits
  2899                              <1> 				 ; (for dword/32bit positioning)	
  2900                              <1> 
  2901 00006591 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  2902 00006596 01D3                <1> 	add	ebx, edx
  2903 00006598 83E01F              <1> 	and	eax, 1Fh ; 31
  2904                              <1> 	; 03/04/2016
  2905 0000659B BA20000000          <1> 	mov	edx, 32
  2906 000065A0 28C2                <1> 	sub	dl, al
  2907 000065A2 39CA                <1> 	cmp	edx, ecx	 ; ecx >= 1
  2908 000065A4 7602                <1> 	jna	short amb_17
  2909 000065A6 89CA                <1> 	mov	edx, ecx
  2910                              <1> amb_17:
  2911 000065A8 29D1                <1> 	sub	ecx, edx
  2912 000065AA 51                  <1> 	push	ecx ; ***
  2913 000065AB 89D1                <1> 	mov	ecx, edx
  2914                              <1> amb_18:		
  2915 000065AD 0FB303              <1> 	btr	[ebx], eax	 ; The destination bit indexed by the source value
  2916                              <1> 				 ; is copied into the Carry Flag and then cleared
  2917                              <1> 				 ; in the destination.
  2918 000065B0 FF0D[98810100]      <1> 	dec     dword [free_pages] ; 1 page has been allocated (X = X-1) 
  2919 000065B6 49                  <1> 	dec	ecx
  2920 000065B7 7404                <1> 	jz	short amb_19
  2921 000065B9 FEC0                <1> 	inc	al
  2922 000065BB EBF0                <1> 	jmp	short amb_18
  2923                              <1> amb_19:	
  2924 000065BD 59                  <1> 	pop	ecx ; ***
  2925 000065BE 21C9                <1> 	and	ecx, ecx ; 0 ?
  2926 000065C0 741E                <1> 	jz	short amb_22	
  2927                              <1> 	; 01/04/2016
  2928 000065C2 B020                <1> 	mov	al, 32
  2929                              <1> amb_20:
  2930 000065C4 83C304              <1> 	add	ebx, 4
  2931 000065C7 39C1                <1> 	cmp	ecx, eax ; 32
  2932 000065C9 7305                <1> 	jnb	short amb_21
  2933                              <1> 	; ECX < 32
  2934 000065CB 28C0                <1> 	sub	al, al ; 0
  2935 000065CD 50                  <1> 	push	eax ; 0 ***
  2936 000065CE EBDD                <1> 	jmp	short amb_18
  2937                              <1> amb_21:
  2938 000065D0 2905[98810100]      <1> 	sub	[free_pages], eax   ; [free_pages] = [free_pages] - 32
  2939 000065D6 C70300000000        <1> 	mov	dword [ebx], 0	    ; reset 32 bits
  2940 000065DC 29C1                <1> 	sub	ecx, eax ; 32
  2941 000065DE 75E4                <1> 	jnz	short amb_20
  2942                              <1> amb_22:
  2943 000065E0 A1[5C8D0100]        <1> 	mov	eax, [mem_pg_pos]   ; Beginning address as page number
  2944 000065E5 8B0D[548D0100]      <1> 	mov	ecx, [mem_aperture] ; Free contiguous page count
  2945                              <1> 	; [next_page] update
  2946 000065EB 89C2                <1> 	mov	edx, eax
  2947                              <1> 	; 03/04/2016
  2948 000065ED C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  2949                              <1> 				     ; (1 allocation bit = 1 page)
  2950                              <1> 				     ; (1 allocation bytes = 8 pages)
  2951 000065F0 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2952                              <1> 				     ; (to get 32 bit position)	
  2953 000065F3 3B15[9C810100]      <1> 	cmp	edx, [next_page] ; first free page pointer offset
  2954 000065F9 7732                <1> 	ja	short amb_25
  2955 000065FB BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  2956 00006600 833C1300            <1> 	cmp	dword [ebx+edx], 0
  2957 00006604 7721                <1> 	ja	short amb_24
  2958 00006606 89C2                <1> 	mov	edx, eax
  2959 00006608 01CA                <1> 	add	edx, ecx
  2960 0000660A C1EA03              <1> 	shr	edx, 3
  2961 0000660D 80E2FC              <1> 	and	dl, 0FCh
  2962                              <1> amb_23:
  2963 00006610 833C1300            <1> 	cmp	dword [ebx+edx], 0
  2964 00006614 7711                <1> 	ja	short amb_24
  2965 00006616 83C204              <1> 	add	edx, 4
  2966 00006619 3B15[A0810100]      <1> 	cmp	edx, [last_page]    ; last page pointer offset
  2967 0000661F 76EF                <1> 	jna	short amb_23
  2968 00006621 8B15[A4810100]      <1> 	mov	edx, [first_page]   ; (for) beginning of user's space
  2969                              <1> amb_24:
  2970 00006627 8915[9C810100]      <1> 	mov	[next_page], edx
  2971                              <1> amb_25:
  2972 0000662D 9C                  <1> 	pushf
  2973 0000662E C1E00C              <1> 	shl	eax, PAGE_SHIFT	     ; convert to phy. address in bytes
  2974 00006631 C1E10C              <1> 	shl	ecx, PAGE_SHIFT	     ; convert to byte counts
  2975 00006634 9D                  <1> 	popf
  2976 00006635 5B                  <1> 	pop	ebx ; **
  2977 00006636 5A                  <1> 	pop	edx ; *
  2978 00006637 C3                  <1> 	retn
  2979                              <1> 
  2980                              <1> amb_26:	; set maximum free memory aperture (free memory block size) 
  2981 00006638 89DA                <1> 	mov	edx, ebx ; current address
  2982 0000663A 81EA00001000        <1> 	sub	edx, MEM_ALLOC_TBL ; MAT beginning address
  2983                              <1> 	; 02/04/2016 
  2984 00006640 C1E203              <1> 	shl	edx, 3 ; MAT byte offset * 8 = page number base
  2985 00006643 01CA                <1> 	add	edx, ecx ; current page number (ecx = 0 to 32)
  2986                              <1> 	;
  2987 00006645 A1[548D0100]        <1> 	mov	eax, [mem_aperture]
  2988 0000664A 21C0                <1> 	and	eax, eax
  2989 0000664C 7421                <1>         jz      short amb_27
  2990 0000664E C705[548D0100]0000- <1>         mov     dword [mem_aperture], 0
  2990 00006656 0000                <1>
  2991 00006658 3B05[588D0100]      <1> 	cmp	eax, [mem_max_aperture]
  2992 0000665E 760F                <1> 	jna	short amb_27
  2993 00006660 A3[588D0100]        <1> 	mov	[mem_max_aperture], eax
  2994                              <1> 	; 25/04/2017
  2995 00006665 A1[5C8D0100]        <1> 	mov	eax, [mem_pg_pos]
  2996                              <1> 	; EAX = Beginning page number of the max. aperture 
  2997 0000666A A3[608D0100]        <1> 	mov	[mem_max_pg_pos], eax
  2998                              <1> amb_27: 
  2999 0000666F 8915[5C8D0100]      <1> 	mov	[mem_pg_pos], edx ; current page
  3000                              <1> 
  3001 00006675 A1[4C8D0100]        <1> 	mov	eax, [mem_ipg_count] ; initial (reset) value of page count
  3002 0000667A A3[508D0100]        <1> 	mov	[mem_pg_count], eax
  3003                              <1> 
  3004 0000667F C3                  <1> 	retn
  3005                              <1> 
  3006                              <1> deallocate_memory_block:
  3007                              <1> 	; 03/04/2016
  3008                              <1> 	; 14/03/2016 (TRDOS 386 = TRDOS v2.0)
  3009                              <1> 	; Deallocating contiguous memory pages (in the kernel's memory space)
  3010                              <1> 	;
  3011                              <1> 	; INPUT -> 
  3012                              <1> 	;	EAX = Beginning address (physical)
  3013                              <1> 	;	ECX = Number of bytes to be deallocated
  3014                              <1> 	;
  3015                              <1> 	; OUTPUT ->
  3016                              <1> 	;	Memory Allocation Table bits will be updated
  3017                              <1> 	;	[free_pages] will be changed (increased)
  3018                              <1> 	;
  3019                              <1> 	; (Modified Registers -> EAX, ECX)
  3020                              <1> 	;
  3021                              <1> 	; PURPOSE: Unloading/Freeing a file -or an allocated memory block- 
  3022                              <1> 	; at memory after copying, running, saving, reading, writing etc.
  3023                              <1> 	;
  3024                              <1> 
  3025 00006680 52                  <1> 	push	edx ; *
  3026 00006681 53                  <1> 	push	ebx ; **
  3027                              <1> 
  3028 00006682 C1E80C              <1> 	shr	eax, PAGE_SHIFT	     ; 12
  3029 00006685 C1E90C              <1> 	shr	ecx, PAGE_SHIFT	     ; 12
  3030                              <1> 
  3031                              <1> 	; EAX = Beginning page number
  3032                              <1> 	; ECX = Number of contiguous pages to be deallocated
  3033                              <1> damb_0:
  3034                              <1> 	; deallocate contiguous memory pages (via memory allocation table bits)
  3035 00006688 89C2                <1> 	mov	edx, eax
  3036 0000668A C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  3037                              <1> 				     ; (1 allocation bit = 1 page)
  3038                              <1> 				     ; (1 allocation bytes = 8 pages)
  3039 0000668D 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  3040                              <1> 				     ; (to get 32 bit position)	
  3041 00006690 3B15[9C810100]      <1> 	cmp	edx, [next_page] ; next free page
  3042 00006696 7306                <1> 	jnb	short damb_1
  3043 00006698 8915[9C810100]      <1> 	mov	[next_page], edx
  3044                              <1> damb_1:
  3045 0000669E BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  3046 000066A3 01D3                <1> 	add	ebx, edx
  3047 000066A5 83E01F              <1> 	and	eax, 1Fh ; 31
  3048                              <1> 
  3049                              <1> 	; 03/04/2016
  3050 000066A8 BA20000000          <1> 	mov	edx, 32
  3051 000066AD 28C2                <1> 	sub	dl, al
  3052 000066AF 39CA                <1> 	cmp	edx, ecx
  3053 000066B1 7602                <1> 	jna	short damb_2
  3054 000066B3 89CA                <1> 	mov	edx, ecx
  3055                              <1> damb_2:
  3056 000066B5 29D1                <1> 	sub	ecx, edx
  3057 000066B7 51                  <1> 	push	ecx ; ***
  3058 000066B8 89D1                <1> 	mov	ecx, edx
  3059                              <1> damb_3:		
  3060 000066BA 0FAB03              <1> 	bts	[ebx], eax	     ; unlink/release/deallocate page
  3061                              <1> 				     ; set relevant bit to 1.
  3062                              <1> 				     ; set CF to the previous bit value	
  3063 000066BD FF05[98810100]      <1> 	inc     dword [free_pages]   ; 1 page has been deallocated (X = X+1) 
  3064 000066C3 49                  <1> 	dec	ecx
  3065 000066C4 7404                <1> 	jz	short damb_4
  3066 000066C6 FEC0                <1> 	inc	al
  3067 000066C8 EBF0                <1> 	jmp	short damb_3
  3068                              <1> damb_4:	
  3069 000066CA 59                  <1> 	pop	ecx ; ***
  3070 000066CB 21C9                <1> 	and	ecx, ecx ; 0 ?
  3071 000066CD 741E                <1> 	jz	short damb_7
  3072                              <1> 	; 03/04/2016
  3073 000066CF B020                <1> 	mov	al, 32
  3074                              <1> damb_5:
  3075 000066D1 83C304              <1> 	add	ebx, 4
  3076 000066D4 39C1                <1> 	cmp	ecx, eax ; 32
  3077 000066D6 7305                <1> 	jnb	short damb_6
  3078                              <1> 	; ECX < 32
  3079 000066D8 28C0                <1> 	sub	al, al ; 0
  3080 000066DA 50                  <1> 	push	eax ; 0 ***
  3081 000066DB EBDD                <1> 	jmp	short damb_3
  3082                              <1> damb_6:
  3083 000066DD 0105[98810100]      <1> 	add	[free_pages], eax ; [free_pages] = [free_pages] + 32
  3084 000066E3 C703FFFFFFFF        <1> 	mov	dword [ebx], 0FFFFFFFFh ; set 32 bits
  3085 000066E9 29C1                <1> 	sub	ecx, eax ; 32
  3086 000066EB 75E4                <1> 	jnz	short damb_5
  3087                              <1> damb_7:
  3088 000066ED 5B                  <1> 	pop	ebx ; **
  3089 000066EE 5A                  <1> 	pop	edx ; *
  3090 000066EF C3                  <1> 	retn
  3091                              <1> 
  3092                              <1> direct_memory_access:
  3093                              <1> 	; 22/07/2017
  3094                              <1> 	; 12/05/2017
  3095                              <1> 	; 16/07/2016
  3096                              <1> 	; 12/07/2016 (TRDOS 386 = TRDOS v2.0)
  3097                              <1> 	; This processure will be called to map
  3098                              <1> 	; user's (ring 3) page tables to access phsical
  3099                              <1> 	; (flat/linear) memory addresses, directly (without
  3100                              <1> 	;  kernel's data transfer functions).
  3101                              <1> 	; 
  3102                              <1> 	; Purpose: Video memory access and shared memory access.
  3103                              <1> 	;
  3104                              <1> 	; INPUT -> 
  3105                              <1> 	;	EAX = Beginning address (physical).
  3106                              <1> 	;	EBX = User's buffer address ; 12/05/2017
  3107                              <1> 	;	ECX = Number of contiguous pages to be mapped.
  3108                              <1> 	; OUTPUT ->
  3109                              <1> 	;	User's page directory and pages tables
  3110                              <1> 	;	will be updated.
  3111                              <1> 	;	
  3112                              <1> 	;	If an old page table entry has valid page address, 
  3113                              <1> 	;	that page will be deallocated just before PTE will
  3114                              <1> 	;	be changed for direct (1 to 1) memory page access.
  3115                              <1> 	;
  3116                              <1> 	;	If old PTE value points to a swapped page,
  3117                              <1>         ;       that page (block) will be unlinked on swap disk. 
  3118                              <1> 	;
  3119                              <1> 	;	Newly allocated pages (except page tables) will not
  3120                              <1> 	;	be applied to Memory Allocation Table.
  3121                              <1> 	;	AVL bit 1 (PTE bit 10) of page table entry will be
  3122                              <1> 	;	used to indicate shared (direct) memory page; then,
  3123                              <1> 	;	this page will not be deallocated later during
  3124                              <1> 	;	process termination. (Memory Allocation Table and
  3125                              <1> 	;	free memory count will not be affected.
  3126                              <1> 	;	(Except deallocating page table's itself.)
  3127                              <1> 	;	
  3128                              <1> 	;      CF = 1 -> error (EAX = error code)
  3129                              <1> 	;      CF = 0 -> success (EAX = beginning address)
  3130                              <1> 	;
  3131                              <1> 	;; (Modified Registers -> none)
  3132                              <1> 	; Modified registers: ebp, edx, ecx, ebx, esi, edi	
  3133                              <1> 	;
  3134                              <1> 
  3135                              <1> 	;push	ebp
  3136                              <1> 	;push	ebx
  3137                              <1> 	;push	ecx
  3138                              <1> 	;push	edx
  3139 000066F0 662500F0            <1> 	and	ax, PTE_A_CLEAR ; clear page offset
  3140 000066F4 50                  <1> 	push	eax
  3141                              <1> 	;and	ecx, ecx ; page count
  3142                              <1> 	;jz	dmem_acc_7  ; 'insufficient memory' error
  3143 000066F5 89C5                <1> 	mov	ebp, eax
  3144 000066F7 81C300004000        <1> 	add	ebx, CORE ; 12/05/2017
  3145                              <1> dmem_acc_0: 
  3146 000066FD 891D[4C980100]      <1> 	mov	[base_addr], ebx ; 12/05/2017
  3147 00006703 A1[B8030300]        <1> 	mov	eax, [u.pgdir] ; page dir address (physical)
  3148 00006708 E8D7F5FFFF          <1> 	call	get_pte
  3149                              <1> 		; EDX = Page table entry address (if CF=0)
  3150                              <1> 	        ;       Page directory entry address (if CF=1)
  3151                              <1> 		;       (Bit 0 value is 0 if PT is not present)
  3152                              <1> 		; EAX = Page table entry value (page address)
  3153                              <1> 		;	CF = 1 -> PDE not present or invalid ? 	
  3154 0000670D 7324                <1> 	jnc	short dmem_acc_1
  3155                              <1> 	;
  3156 0000670F E8B5F4FFFF          <1> 	call	allocate_page
  3157 00006714 0F82AB000000        <1>         jc      dmem_acc_7  ; 'insufficient memory' error
  3158                              <1> 	;
  3159 0000671A E824F5FFFF          <1> 	call 	clear_page
  3160                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  3161 0000671F 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER ; 4+2+1 = 7
  3162                              <1> 			   ; lower 3 bits are used as U/S, R/W, P flags
  3163                              <1> 			   ; (user, writable, present page)	
  3164 00006721 8902                <1> 	mov	[edx], eax ; Let's put the new page directory entry here !
  3165 00006723 A1[B8030300]        <1> 	mov	eax, [u.pgdir]	
  3166 00006728 E8B7F5FFFF          <1> 	call	get_pte
  3167 0000672D 0F8292000000        <1>         jc      dmem_acc_7 ; 'insufficient memory' error
  3168                              <1> dmem_acc_1:
  3169                              <1> 	; EAX = PTE value, EDX = PTE address
  3170 00006733 A801                <1> 	test 	al, PTE_A_PRESENT
  3171 00006735 750D                <1> 	jnz	short dmem_acc_2
  3172 00006737 09C0                <1> 	or	eax, eax
  3173 00006739 7468                <1> 	jz	short dmem_acc_6   ; Change PTE
  3174 0000673B D1E8                <1> 	shr	eax, 1		; swap disk block (8 sectors) address
  3175                              <1> 	; unlink swap disk block
  3176 0000673D E80CFBFFFF          <1> 	call	unlink_swap_block
  3177 00006742 EB5F                <1> 	jmp	short dmem_acc_6
  3178                              <1> 
  3179                              <1> dmem_acc_2:
  3180 00006744 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
  3181                              <1> 				  ; (must be 1)
  3182 00006746 7550                <1> 	jnz	short dmem_acc_4
  3183                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
  3184 00006748 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
  3185                              <1> 				   ; as child's page ?
  3186 0000674C 7455                <1> 	jz	short dmem_acc_5 ; Change PTE but don't deallocate the page!
  3187                              <1> 
  3188                              <1> 	;push	edi
  3189                              <1> 	;push	esi
  3190                              <1> 
  3191 0000674E 51                  <1> 	push	ecx
  3192                              <1> 	;push	ebx
  3193 0000674F 8B1D[BC030300]      <1> 	mov	ebx, [u.ppgdir] ; parent's page dir address (physical)
  3194                              <1> 	
  3195                              <1> 	; check the parent's PTE value is read only & same page or not.. 
  3196 00006755 89EF                <1> 	mov	edi, ebp
  3197 00006757 C1EF16              <1> 	shr	edi, PAGE_D_SHIFT ; 22
  3198                              <1> 	; EDI = page directory entry index (0-1023)
  3199 0000675A 89EE                <1> 	mov	esi, ebp
  3200 0000675C C1EE0C              <1> 	shr	esi, PAGE_SHIFT ; 12	
  3201 0000675F 81E6FF030000        <1> 	and	esi, PTE_MASK
  3202                              <1> 	; ESI = page table entry index (0-1023)
  3203                              <1> 
  3204 00006765 66C1E702            <1> 	shl	di, 2 ; * 4
  3205 00006769 01FB                <1> 	add	ebx, edi ; PDE offset (for the parent)
  3206 0000676B 8B0F                <1> 	mov	ecx, [edi]
  3207 0000676D F6C101              <1> 	test	cl, PDE_A_PRESENT ; present (valid) or not ?
  3208 00006770 7425                <1> 	jz	short dmem_acc_3	; parent process does not use this page
  3209 00006772 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  3210 00006777 66C1E602            <1> 	shl	si, 2 ; *4 
  3211 0000677B 01CE                <1> 	add	esi, ecx ; PTE offset (for the parent)
  3212 0000677D 8B1E                <1> 	mov	ebx, [esi]
  3213 0000677F F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
  3214 00006782 7413                <1> 	jz	short dmem_acc_3	; parent process does not use this page
  3215 00006784 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
  3216 00006788 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
  3217 0000678D 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
  3218 0000678F 7506                <1> 	jne	short dmem_acc_3	; not same page
  3219                              <1> 				; deallocate the child's page
  3220 00006791 800E02              <1>         or      byte [esi], PTE_A_WRITE ; convert to writable page (parent)
  3221                              <1> 	;pop	ebx
  3222 00006794 59                  <1> 	pop	ecx
  3223 00006795 EB0C                <1> 	jmp	short dmem_acc_5
  3224                              <1> dmem_acc_3:
  3225                              <1> 	;pop	ebx
  3226 00006797 59                  <1> 	pop	ecx
  3227                              <1> dmem_acc_4:	
  3228 00006798 66A90004            <1> 	test	ax, PTE_SHARED ; shared or direct memory access indicator
  3229 0000679C 7505                <1> 	jnz	short dmem_acc_5   ; AVL bit 1 = 1, do not deallocate this page!
  3230                              <1> 	;
  3231                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3232 0000679E E804F6FFFF          <1> 	call	deallocate_page
  3233                              <1> dmem_acc_5:
  3234                              <1> 	;pop	esi
  3235                              <1> 	;pop	edi
  3236                              <1> dmem_acc_6:
  3237 000067A3 89E8                <1> 	mov	eax, ebp ; physical page (offset=0) address
  3238                              <1> 	; EAX = memory page address
  3239                              <1> 	; EDX = PTE entry address (physical)
  3240 000067A5 660D0704            <1> 	or	ax, PTE_A_PRESENT+PTE_A_USER+PTE_A_WRITE+PTE_SHARED
  3241                              <1> 			; present flag, bit 0 = 1
  3242                              <1> 			; user flag, bit 2 = 1	
  3243                              <1> 			; writable flag, bit 1 = 1
  3244                              <1> 			; direct memory access flag, bit 10 = 1
  3245                              <1> 			; (This page must not be deallocated!)
  3246 000067A9 8902                <1> 	mov	[edx], eax  ; Update PTE value
  3247 000067AB 49                  <1> 	dec	ecx ; remain count of contiguous pages
  3248 000067AC 741E                <1> 	jz	short dmem_acc_8
  3249 000067AE 81C500100000        <1> 	add	ebp, PAGE_SIZE ; next physical page address
  3250                              <1> 	; 22/07/2017
  3251                              <1> 	;mov	eax, ebp
  3252                              <1> 	; 12/05/2017
  3253 000067B4 8B1D[4C980100]      <1> 	mov	ebx, [base_addr] ; linear address (virtual+CORE)
  3254 000067BA 81C300100000        <1> 	add	ebx, PAGE_SIZE	; next linear address
  3255 000067C0 E938FFFFFF          <1>         jmp     dmem_acc_0
  3256                              <1> dmem_acc_7:  ; ERROR ! 
  3257 000067C5 C7042404000000      <1> 	mov	dword [esp], ERR_MINOR_IM 
  3258                              <1> 		; Insufficient memory (minor) error!
  3259                              <1> 		; Major error = 0 (No protection fault)	
  3260                              <1> 	; cf = 1
  3261                              <1> dmem_acc_8:
  3262 000067CC 58                  <1> 	pop	eax
  3263                              <1> 	;pop	edx
  3264                              <1> 	;pop	ecx
  3265                              <1> 	;pop	ebx
  3266                              <1> 	;pop	ebp
  3267 000067CD C3                  <1> 	retn
  3268                              <1> 
  3269                              <1> deallocate_user_pages:
  3270                              <1> 	; 20/05/2017
  3271                              <1> 	; 15/05/2017
  3272                              <1> 	; 20/02/2017
  3273                              <1> 	; 19/02/2017 (TRDOS 386 = TRDOS v2.0)
  3274                              <1> 	;
  3275                              <1> 	; Deallocate virtually contiguous user pages (memory block)
  3276                              <1> 	; (caller: 'sysdalloc' system call)
  3277                              <1> 	;
  3278                              <1> 	; INPUT ->
  3279                              <1> 	;	EBX = VIRTUAL ADDRESS (beginning address)
  3280                              <1> 	;	ECX = byte count
  3281                              <1> 	;	[u.pgdir] = user's page directory
  3282                              <1> 	;	[u.ppdir] = parent's page directory
  3283                              <1> 	;
  3284                              <1> 	; OUTPUT ->
  3285                              <1> 	;    If CF = 0 	
  3286                              <1> 	;	EAX = Deallocated memory bytes
  3287                              <1> 	;	  (Even if shared or read only pages will not be
  3288                              <1> 	;	   deallocated on M.A.T., this byte count will be
  3289                              <1> 	;	   returned as virtually deallocated bytes; in fact
  3290                              <1> 	;	   virtually deallocated user pages * 4096.) 
  3291                              <1> 	;	EBX = Virtual address (as rounded up)
  3292                              <1> 	;    If CF = 1    	
  3293                              <1> 	;	EAX = 0 (there is not any deallocated pages)
  3294                              <1> 	;
  3295                              <1> 	; Note: Empty page tables will not be deallocated!!!
  3296                              <1> 	;     (they will be deallocated at process termination stage)
  3297                              <1> 	;
  3298                              <1> 	; Modified Registers -> EAX, EDX, ESI, EDI, EBX, ECX, EBP
  3299                              <1> 	;
  3300 000067CE 89DE                <1> 	mov	esi, ebx
  3301 000067D0 89F7                <1> 	mov	edi, esi
  3302 000067D2 01CF                <1> 	add	edi, ecx
  3303 000067D4 81C6FF0F0000        <1> 	add	esi, PAGE_SIZE - 1  ; 4095 (round up)	
  3304 000067DA C1EE0C              <1> 	shr	esi, PAGE_SHIFT
  3305 000067DD C1EF0C              <1> 	shr	edi, PAGE_SHIFT
  3306 000067E0 89F8                <1> 	mov	eax, edi ; end page
  3307 000067E2 29F0                <1> 	sub	eax, esi ; end page - start page
  3308 000067E4 0F86D5000000        <1> 	jna	da_u_pd_err  ; < 1
  3309 000067EA 89F3                <1> 	mov	ebx, esi
  3310 000067EC C1E30C              <1> 	shl	ebx, PAGE_SHIFT ; virtual address (as rounded up)
  3311 000067EF 53                  <1> 	push	ebx ; *
  3312 000067F0 89C1                <1> 	mov	ecx, eax ; page count
  3313 000067F2 C1E00C              <1> 	shl	eax, PAGE_SHIFT ; byte count as adjusted
  3314 000067F5 50                  <1> 	push	eax ; **
  3315 000067F6 8B1D[B8030300]      <1> 	mov	ebx, [u.pgdir] ; physical addr of user's page dir
  3316 000067FC 81C600040000        <1>  	add	esi, CORE/PAGE_SIZE 
  3317 00006802 89F7                <1> 	mov	edi, esi
  3318 00006804 81E7FF030000        <1> 	and	edi, PTE_MASK ; PTE entry in the page table
  3319 0000680A 57                  <1> 	push	edi ; *** ; PTE index (of page directory)
  3320 0000680B C1EE0A              <1> 	shr	esi, PAGE_D_SHIFT - PAGE_SHIFT ; 22-12=10
  3321 0000680E 89F2                <1> 	mov	edx, esi 
  3322                              <1> 	; EDX = PDE index
  3323 00006810 C1E602              <1> 	shl	esi, 2 ; convert PDE index to dword offset
  3324 00006813 01DE                <1> 	add	esi, ebx ; add page directory address
  3325                              <1> da_u_pd_1:
  3326 00006815 AD                  <1> 	lodsd
  3327                              <1> 	;
  3328 00006816 89F5                <1> 	mov	ebp, esi ; 20/02/2017
  3329                              <1> 	; EBP = next PDE address
  3330                              <1> 	;
  3331 00006818 A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
  3332 0000681A 0F8494000000        <1> 	jz	da_u_pd_3 ; 20/05/2017	
  3333 00006820 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3334                              <1> 	; EAX = PHYSICAL (flat) ADDRESS OF THE PAGE TABLE
  3335 00006824 8B3C24              <1> 	mov	edi, [esp] ; ***
  3336                              <1> 	; EDI = PTE index (of complete page directory)
  3337                              <1> 	;and	edi, PTE_MASK ; PTE entry in the page table
  3338 00006827 C1E702              <1> 	shl	edi, 2 ; convert PTE index to dword offset
  3339 0000682A 89FE                <1> 	mov	esi, edi ; PTE offset in page table (0-4092)
  3340 0000682C 01C6                <1> 	add	esi, eax ; now, esi points to requested PTE
  3341                              <1> da_u_pt_0:
  3342 0000682E AD                  <1> 	lodsd
  3343 0000682F A801                <1> 	test	al, PTE_A_PRESENT ; bit 0, present flag (must be 1)
  3344 00006831 743F                <1> 	jz	short da_u_pt_1
  3345                              <1> 	;
  3346 00006833 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
  3347                              <1> 				  ; (must be 1)
  3348 00006835 7549                <1> 	jnz	short da_u_pt_3
  3349                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
  3350 00006837 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
  3351                              <1> 				   ; as child's page ?
  3352 0000683B 744E                <1> 	jz	short da_u_pt_4 ; Clear PTE but don't deallocate the page!
  3353                              <1> 	;
  3354                              <1> 	; check the parent's PTE value is read only & same page or not.. 
  3355                              <1> 	; EDX = page directory entry index (0-1023)
  3356 0000683D 52                  <1> 	push	edx ; ****
  3357                              <1> 	; EDI = page table entry offset (0-4092)
  3358 0000683E 8B1D[BC030300]      <1> 	mov	ebx, [u.ppgdir] ; page directory of the parent process
  3359 00006844 66C1E202            <1> 	shl	dx, 2 ; *4 
  3360 00006848 01D3                <1> 	add	ebx, edx ; PDE address (for the parent)
  3361 0000684A 8B13                <1> 	mov	edx, [ebx] ; page table address
  3362 0000684C F6C201              <1> 	test	dl, PDE_A_PRESENT ; present (valid) or not ?
  3363 0000684F 742E                <1> 	jz	short da_u_pt_2	; parent process does not use this page
  3364 00006851 6681E200F0          <1> 	and	dx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  3365                              <1> 	; EDI = page table entry offset (0-4092)
  3366 00006856 01D7                <1> 	add	edi, edx	; PTE address (for the parent)
  3367 00006858 8B1F                <1> 	mov	ebx, [edi]
  3368 0000685A F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
  3369 0000685D 7420                <1> 	jz	short da_u_pt_2	; parent process does not use this page
  3370 0000685F 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
  3371 00006863 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
  3372 00006868 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
  3373 0000686A 7513                <1> 	jne	short da_u_pt_2	; not same page
  3374                              <1> 				; deallocate the child's page
  3375 0000686C 800F02              <1>         or      byte [edi], PTE_A_WRITE ; convert to writable page (parent)
  3376 0000686F 5A                  <1> 	pop	edx ; ****
  3377 00006870 EB19                <1> 	jmp	short da_u_pt_4
  3378                              <1> da_u_pt_1:
  3379 00006872 09C0                <1> 	or	eax, eax	; swapped page ?
  3380 00006874 741C                <1> 	jz	short da_u_pt_5	; no
  3381                              <1> 				; yes
  3382 00006876 D1E8                <1> 	shr	eax, 1
  3383 00006878 E8D1F9FFFF          <1> 	call	unlink_swap_block ; Deallocate swapped page block
  3384                              <1> 				  ; on the swap disk (or in file)
  3385 0000687D EB13                <1> 	jmp	short da_u_pt_5
  3386                              <1> da_u_pt_2:
  3387 0000687F 5A                  <1> 	pop	edx ; ****
  3388                              <1> da_u_pt_3:
  3389 00006880 66A90004            <1> 	test	ax, PTE_SHARED	; shared or direct memory access indicator
  3390 00006884 7505                <1> 	jnz	short da_u_pt_4	; AVL bit 1 = 1, do not deallocate this page!
  3391                              <1> 	;
  3392                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3393 00006886 E81CF5FFFF          <1> 	call	deallocate_page ; set the mem allocation bit of this page
  3394                              <1> da_u_pt_4:
  3395 0000688B C746FC00000000      <1> 	mov	dword [esi-4], 0 ; clear/reset PTE (child, dupl. as parent)
  3396                              <1> da_u_pt_5:
  3397                              <1> 	; 20/05/2017
  3398 00006892 58                  <1> 	pop	eax ; *** PTE index (of page directory)
  3399 00006893 49                  <1> 	dec	ecx ; remain page count
  3400 00006894 7426                <1> 	jz	short da_u_pd_4
  3401 00006896 40                  <1> 	inc	eax ; next PTE
  3402 00006897 6625FF03            <1> 	and	ax, PTE_MASK ; PTE entry index in the page table
  3403 0000689B 50                  <1> 	push	eax ; *** (save again)
  3404                              <1> 	;mov	edi, eax
  3405                              <1> 	;and 	di, PTE_MASK
  3406                              <1> 	;cmp	edi, PAGE_SIZE / 4 ; 1024
  3407                              <1> 	;jnb	short da_u_pd_2
  3408 0000689C 89C7                <1> 	mov	edi, eax
  3409 0000689E C1E702              <1> 	shl	edi, 2 ; convert index to dword offset
  3410                              <1> 	;test	ax, PTE_MASK ; 3FFh
  3411 000068A1 09C0                <1> 	or	eax, eax
  3412 000068A3 7589                <1> 	jnz	short da_u_pt_0 ; 1-1023
  3413                              <1> da_u_pd_2:
  3414 000068A5 42                  <1> 	inc	edx
  3415                              <1> 	; 20/05/2017
  3416 000068A6 6681E2FF03          <1> 	and	dx, PTE_MASK  ; 3FFh
  3417 000068AB 740F                <1> 	jz	short da_u_pd_4  ; 0 (1024)
  3418                              <1> 	;cmp	edx, 1024
  3419                              <1> 	;jnb	short da_u_pd_4
  3420 000068AD 89EE                <1> 	mov	esi, ebp ; 20/02/2017
  3421 000068AF E961FFFFFF          <1> 	jmp	da_u_pd_1
  3422                              <1> da_u_pd_3:
  3423                              <1> 	; 15/05/2017 (empty page directory entry)
  3424 000068B4 81E900040000        <1> 	sub	ecx, 1024
  3425 000068BA 77E9                <1> 	ja	short da_u_pd_2 ; 20/05/2017
  3426                              <1> da_u_pd_4:
  3427 000068BC 58                  <1> 	pop	eax ; **
  3428 000068BD 5B                  <1> 	pop	ebx ; *
  3429 000068BE C3                  <1> 	retn
  3430                              <1> 
  3431                              <1> da_u_pd_err:
  3432 000068BF 31C0                <1> 	xor	eax, eax
  3433 000068C1 F9                  <1> 	stc	
  3434 000068C2 C3                  <1> 	retn
  3435                              <1> 
  3436                              <1> allocate_user_pages:
  3437                              <1> 	; 20/05/2017
  3438                              <1> 	; 01/05/2017, 02/05/2017, 15/05/2017
  3439                              <1> 	; 04/03/2017
  3440                              <1> 	; 20/02/2017 (TRDOS 386 = TRDOS v2.0)
  3441                              <1> 	;
  3442                              <1> 	; Allocate physically contiguous user pages (memory block)
  3443                              <1> 	; (caller: 'sysalloc' system call)
  3444                              <1> 	;
  3445                              <1> 	; Note: This procedure does not alloc a page's itself
  3446                              <1> 	;	(page bit) on Memory Allocation Table.
  3447                              <1> 	;	(allocate_memory_block is needed before this proc)
  3448                              <1> 	;
  3449                              <1> 	; INPUT ->
  3450                              <1> 	;	EAX = PHYSICAL ADDRESS (beginning address)
  3451                              <1> 	;	EBX = VIRTUAL ADDRESS (beginning address)
  3452                              <1> 	;	ECX = byte count (>=4096)
  3453                              <1> 	;	[u.pgdir] = user's page directory
  3454                              <1> 	;	
  3455                              <1> 	;	Note: All addresses are (must be) already adjusted
  3456                              <1> 	;	to page	borders, otherwise, lower 12bits of addresses
  3457                              <1> 	;	and byte count would be truncated.
  3458                              <1> 	;
  3459                              <1> 	; OUTPUT ->
  3460                              <1> 	;	none
  3461                              <1> 	;
  3462                              <1> 	;	CF = 1 -> insufficient memory error
  3463                              <1> 	;
  3464                              <1> 	; Note: All pages will be allocated in physical page order 
  3465                              <1> 	;	from the beginning page address. 
  3466                              <1> 	;	* A new page table will be added to the page dir
  3467                              <1> 	;	  when the requested PDE is invalid.
  3468                              <1> 	;	* Those pages will not be added to swap queue
  3469                              <1> 	;	  because main purpose of this allocation is to
  3470                              <1> 	;	  set a direct memory access (DMA controller) buffer.
  3471                              <1> 	;	 (Swapping out a page in a DMA buffer would be wrong!)
  3472                              <1> 	;	* Previous content of page tables (PTEs) would be
  3473                              <1> 	;	  (should be) deallocated before entering this
  3474                              <1> 	;	  procedure. So, new page table entries (PTEs)
  3475                              <1> 	;	  directly will be written without checking
  3476                              <1> 	;	  their previous content.	
  3477                              <1> 	;	* Only solution to increase free memory by removing
  3478                              <1> 	;	  that non-swappable memory block is to terminate
  3479                              <1> 	;	  the process or to wait until the process will 
  3480                              <1> 	;	  deallocate that memory block as itself. ('sysdalloc')
  3481                              <1> 	;	  (No problem, if the process does not grab all of
  3482                              <1> 	;	  -very big amount of- free memory by using
  3483                              <1> 	;	  'sysalloc' system call!?)
  3484                              <1> 	;	  (Even if the process has grabbed all of free memory, 
  3485                              <1> 	;	  no problem if the process is not running in 
  3486                              <1> 	;	  multitasking mode. No problem in multitasking
  3487                              <1> 	;	  mode if there is not another process which is running
  3488                              <1> 	;	  or waiting or sleeping for an event as it's pages
  3489                              <1> 	;	  are swapped-out. But a new process can not start to
  3490                              <1> 	;	  run if all of free memory has beeen allocated 
  3491                              <1> 	;	  by running processes. Deallocation -'sysdalloc'- 
  3492                              <1> 	;	  or terminate a running process is needed 
  3493                              <1> 	;	  in order to run a new process.) 
  3494                              <1> 	;
  3495                              <1> 	; Modified Registers -> EAX, EDX, ESI, EDI, EBX, ECX, EBP
  3496                              <1> 	;
  3497                              <1> 
  3498                              <1> 	; 01/05/2017
  3499 000068C3 662500F0            <1> 	and	ax, ~PAGE_OFF
  3500 000068C7 6681E300F0          <1> 	and	bx, ~PAGE_OFF
  3501                              <1> 	; 02/05/2017 
  3502 000068CC BD00F0FFFF          <1> 	mov	ebp, 0FFFFF000h ; 4 Giga Bytes - 4096 Bytes (for Stack)
  3503 000068D1 C1E90C              <1> 	shr	ecx, PAGE_SHIFT ; page count
  3504 000068D4 83F901              <1> 	cmp	ecx, 1
  3505 000068D7 7251                <1> 	jb	short a_u_im_retn
  3506 000068D9 89C2                <1> 	mov	edx, eax
  3507 000068DB 01CA                <1> 	add	edx, ecx
  3508 000068DD 724B                <1> 	jc	short a_u_im_retn
  3509 000068DF 39D5                <1> 	cmp	ebp, edx
  3510 000068E1 7247                <1> 	jb	short a_u_im_retn
  3511 000068E3 89DA                <1> 	mov	edx, ebx
  3512 000068E5 81C200004000        <1> 	add	edx, CORE
  3513 000068EB 723D                <1> 	jc	short a_u_im_retn	
  3514 000068ED 01CA                <1> 	add	edx, ecx
  3515 000068EF 7239                <1> 	jc	short a_u_im_retn
  3516 000068F1 39D5                <1> 	cmp	ebp, edx
  3517 000068F3 7235                <1> 	jb	short a_u_im_retn
  3518                              <1> 	;
  3519 000068F5 89C5                <1> 	mov	ebp, eax ; physical address
  3520 000068F7 89DE                <1> 	mov	esi, ebx
  3521 000068F9 81C600004000        <1> 	add	esi, CORE ; start of user's memory (4M) 
  3522 000068FF C1EE0C              <1> 	shr	esi, PAGE_SHIFT ; higher 20 bits of the linear address
  3523                              <1> 	;shr	ecx, PAGE_SHIFT ; page count
  3524 00006902 8B1D[B8030300]      <1> 	mov	ebx, [u.pgdir] ; physical addr of user's page dir
  3525 00006908 89F7                <1> 	mov	edi, esi
  3526 0000690A 81E7FF030000        <1> 	and	edi, PTE_MASK ; PTE entry index in the page table
  3527 00006910 57                  <1> 	push	edi  ; * ; PTE index (in page directory)
  3528 00006911 C1EE0A              <1> 	shr	esi, PAGE_D_SHIFT - PAGE_SHIFT ; 22-12=10
  3529 00006914 89F2                <1> 	mov	edx, esi 
  3530                              <1> 	; EDX = PDE index
  3531 00006916 C1E602              <1> 	shl	esi, 2 ; convert PDE index to dword offset
  3532 00006919 01DE                <1> 	add	esi, ebx ; add page directory address
  3533                              <1> a_u_pd_0:
  3534 0000691B AD                  <1> 	lodsd
  3535                              <1> 	;
  3536 0000691C 89F3                <1> 	mov	ebx, esi ; next PDE address
  3537                              <1> 	;
  3538 0000691E A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
  3539 00006920 7513                <1> 	jnz	short a_u_pd_2
  3540                              <1> 	;
  3541                              <1> 	; empty PDE (it does not point to valid page table address)
  3542 00006922 E8A2F2FFFF          <1> 	call	allocate_page  ; (allocate a new page table)
  3543 00006927 7302                <1> 	jnc	short a_u_pd_1 ; OK... now, we have a new page table.
  3544                              <1> 	; cf = 1
  3545                              <1> 	; There is not a free memory page to allocate a new page table !!!
  3546 00006929 5E                  <1> 	pop	esi ; *
  3547                              <1> a_u_im_retn:
  3548 0000692A C3                  <1> 	retn	; return to 'sysalloc' with 'insufficient memory' error
  3549                              <1> 	;
  3550                              <1> a_u_pd_1: ; clear the new page table content 
  3551                              <1> 	; EAX = Physical (base) address of the new page table
  3552 0000692B E813F3FFFF          <1> 	call	clear_page ; Clear page content
  3553                              <1> 	;
  3554 00006930 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER
  3555                              <1> 		 ; set bit 0, bit 1 and bit 2 to 1
  3556                              <1> 		 ; (present, writable, user)
  3557 00006932 8946FC              <1> 	mov	[esi-4], eax
  3558                              <1> a_u_pd_2:
  3559 00006935 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3560                              <1> 	; EAX = PHYSICAL (flat) ADDRESS OF THE PAGE TABLE
  3561 00006939 8B3C24              <1> 	mov	edi, [esp] ; *
  3562                              <1> 	; EDI = PTE index (of page directory)
  3563                              <1> 	;and	edi, PTE_MASK ; PTE entry index in the page table	
  3564                              <1> 	; EBX = next PDE address
  3565 0000693C 89FE                <1> 	mov	esi, edi ; PTE index in page table (0-1023)
  3566 0000693E C1E702              <1> 	shl	edi, 2 ; convert PTE index to dword offset
  3567 00006941 01C7                <1> 	add	edi, eax ; now, edi points to requested PTE
  3568                              <1> a_u_pt_0:
  3569                              <1> 	; 02/05/2017
  3570 00006943 8B07                <1> 	mov	eax, [edi]
  3571                              <1> 	;
  3572 00006945 A801                <1> 	test	al, PTE_A_PRESENT ; bit 0, present flag (must be 1)
  3573 00006947 7445                <1> 	jz	short a_u_pt_1
  3574                              <1> 	;
  3575 00006949 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
  3576                              <1> 				  ; (must be 1)
  3577 0000694B 7550                <1> 	jnz	short a_u_pt_3
  3578                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
  3579 0000694D 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
  3580                              <1> 				   ; as child's page ?
  3581 00006951 7455                <1> 	jz	short a_u_pt_4	; Clear PTE but don't deallocate the page!
  3582                              <1> 	;
  3583                              <1> 	; check the parent's PTE value is read only & same page or not.. 
  3584                              <1> 	; EDX = page directory entry index (0-1023)
  3585 00006953 52                  <1> 	push	edx ; **
  3586 00006954 53                  <1> 	push	ebx ; ***
  3587                              <1> 	; ESI = page table entry index (0-1023)
  3588                              <1> 	;push	esi ; **** ; 20/05/2017
  3589 00006955 8B1D[BC030300]      <1> 	mov	ebx, [u.ppgdir] ; page directory of the parent process
  3590 0000695B 66C1E202            <1> 	shl	dx, 2 ; *4 
  3591 0000695F 01D3                <1> 	add	ebx, edx ; PTE address,0 (for the parent)
  3592 00006961 8B13                <1> 	mov	edx, [ebx] ; page table address
  3593 00006963 F6C201              <1> 	test	dl, PDE_A_PRESENT ; present (valid) or not ?
  3594 00006966 7433                <1> 	jz	short a_u_pt_2	; parent process does not use this page
  3595 00006968 6681E200F0          <1> 	and	dx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  3596 0000696D 66C1E602            <1> 	shl	si, 2 ; *4
  3597                              <1> 	; ESI = page table entry offset (0-4092)
  3598 00006971 01D6                <1> 	add	esi, edx	; PTE address (for the parent)
  3599 00006973 8B1E                <1> 	mov	ebx, [esi]
  3600 00006975 F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
  3601 00006978 7421                <1> 	jz	short a_u_pt_2	; parent process does not use this page
  3602 0000697A 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
  3603 0000697E 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
  3604 00006983 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
  3605 00006985 7514                <1> 	jne	short a_u_pt_2	; not same page
  3606                              <1> 				; deallocate the child's page
  3607 00006987 800E02              <1>         or      byte [esi], PTE_A_WRITE ; convert to writable page (parent)
  3608                              <1> 	;pop	esi ; **** ; 20/05/2017
  3609 0000698A 5B                  <1> 	pop	ebx ; ***
  3610 0000698B 5A                  <1> 	pop	edx ; **
  3611 0000698C EB1A                <1> 	jmp	short a_u_pt_4
  3612                              <1> a_u_pt_1:
  3613 0000698E 09C0                <1> 	or	eax, eax	; swapped page ?
  3614 00006990 7416                <1> 	jz	short a_u_pt_4	; no
  3615                              <1> 				; yes
  3616 00006992 D1E8                <1> 	shr	eax, 1
  3617 00006994 E8B5F8FFFF          <1> 	call	unlink_swap_block ; Deallocate swapped page block
  3618                              <1> 				  ; on the swap disk (or in file)
  3619 00006999 EB0D                <1> 	jmp	short a_u_pt_4
  3620                              <1> a_u_pt_2:
  3621                              <1> 	;pop	esi ; **** ; 20/05/2017
  3622 0000699B 5B                  <1> 	pop	ebx ; ***
  3623 0000699C 5A                  <1> 	pop	edx ; **
  3624                              <1> a_u_pt_3:
  3625 0000699D 66A90004            <1> 	test	ax, PTE_SHARED	; shared or direct memory access indicator
  3626 000069A1 7505                <1> 	jnz	short a_u_pt_4	; AVL bit 1 = 1, do not deallocate this page!
  3627                              <1> 	;
  3628                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3629 000069A3 E8FFF3FFFF          <1> 	call	deallocate_page ; set the mem allocation bit of this page
  3630                              <1> 	;
  3631                              <1> a_u_pt_4:
  3632 000069A8 89E8                <1> 	mov	eax, ebp ; physical address
  3633 000069AA 0C07                <1> 	or	al, PTE_A_PRESENT + PTE_A_WRITE + PTE_A_USER ; 04/03/2017
  3634 000069AC AB                  <1> 	stosd
  3635 000069AD 5E                  <1> 	pop	esi ; * ; 20/05/2017
  3636 000069AE 49                  <1> 	dec	ecx ; remain page count
  3637 000069AF 7417                <1> 	jz	short a_u_pd_5
  3638 000069B1 81C500100000        <1> 	add	ebp, PAGE_SIZE
  3639 000069B7 46                  <1> 	inc	esi ; next PTE (index)
  3640                              <1> 	; 20/05/2017
  3641                              <1> 	;cmp	esi, PAGE_SIZE/4 ; 1024
  3642                              <1> 	;jb	short a_u_pt_0
  3643 000069B8 6681E6FF03          <1> 	and	si, PTE_MASK ; 3FFh (0 to 1023)
  3644 000069BD 56                  <1> 	push	esi ; *
  3645 000069BE 7583                <1> 	jnz	short a_u_pt_0 ; > 0 (<1024)
  3646                              <1> a_u_pd_3:
  3647 000069C0 42                  <1> 	inc	edx
  3648                              <1> ;	cmp	edx, 1024
  3649                              <1> ;	jnb	short a_u_pd_4 ; 02/05/2017 (error!, ecx > 0)
  3650 000069C1 89DE                <1> 	mov	esi, ebx ; the next PDE address
  3651 000069C3 E953FFFFFF          <1> 	jmp	a_u_pd_0
  3652                              <1> a_u_pd_4:
  3653                              <1> 	; 02/05/2017
  3654                              <1> ;	stc
  3655                              <1> a_u_pd_5:
  3656                              <1> 	; 20/05/2017
  3657                              <1> 	;pop	edi ; *
  3658 000069C8 C3                  <1> 	retn
  3659                              <1> 
  3660                              <1> allocate_lfb_pages_for_kernel:
  3661                              <1> 	; 15/12/2020
  3662                              <1> 	; 14/12/2020 - TRDOS 386 v2.0.3
  3663                              <1> 	; Set kernel page tables for linear frame buffer 
  3664                              <1> 	; (this procedure will be called by kernel only)
  3665                              <1> 	;
  3666                              <1> 	; Input:
  3667                              <1> 	;	[LFB_ADDR] = linear frame buffer base address
  3668                              <1>  	;	[LFB_SIZE] = linear frame buffer size in bytes
  3669                              <1> 	; Output:
  3670                              <1> 	;	none
  3671                              <1> 	;	cf = 1 -> error
  3672                              <1> 	;
  3673                              <1> 	; Modified registers: eax, ecx, edx, edi
  3674                              <1> 
  3675 000069C9 8B3D[2C120300]      <1> 	mov	edi, [LFB_ADDR]
  3676 000069CF 8B15[30120300]      <1> 	mov	edx, [LFB_SIZE]
  3677                              <1> 
  3678 000069D5 C1EF16              <1> 	shr	edi, 22	; convert address to page number
  3679                              <1> 			; and then convert it to PDE entry offset
  3680                              <1> 			; (1 PDE is for 4MB, 22 bit shift)
  3681                              <1> 
  3682 000069D8 66C1E702            <1> 	shl	di, 2	; * 4 for offset 
  3683                              <1> 
  3684                              <1> 	;add	edx, 4095
  3685 000069DC C1EA0C              <1> 	shr	edx, 12	; convert LFB size to LFB page count
  3686                              <1> 	
  3687 000069DF 89D1                <1> 	mov	ecx, edx ; * ; LFB page count
  3688                              <1> 
  3689 000069E1 81C1FF030000        <1> 	add	ecx, 1023 ; page count + 1023
  3690 000069E7 C1E90A              <1> 	shr	ecx, 10 ; convert to page directory entry count	
  3691                              <1> 			; (page table count)
  3692 000069EA 51                  <1> 	push	ecx ; **
  3693 000069EB C1E10C              <1> 	shl	ecx, 12 ; convert to byte count
  3694                              <1> 
  3695 000069EE 31C0                <1> 	xor	eax, eax ; first available pages
  3696                              <1> 	
  3697                              <1> 	; allocate contiguous memory block for these kernel pages
  3698                              <1> 	
  3699 000069F0 E87EFAFFFF          <1> 	call	allocate_memory_block
  3700                              <1> 	; eax = start address of (contiguous) memory block
  3701 000069F5 59                  <1> 	pop	ecx ; ** ; PDE count
  3702 000069F6 7301                <1> 	jnc	short a_lfb_k_1
  3703                              <1> 	; error (cf=1)
  3704 000069F8 C3                  <1> 	retn
  3705                              <1> a_lfb_k_1:
  3706                              <1> 	; Allocate (new) page tables in kernel's page directory
  3707 000069F9 51                  <1> 	push	ecx ; PDE (page table) count
  3708 000069FA 50                  <1> 	push	eax ; start address of contiguous memory pages
  3709                              <1> 		    ; (at page boundary)	
  3710                              <1> 	; edi = 1st page directory entry offset
  3711 000069FB 033D[90810100]      <1> 	add	edi, [k_page_dir] ; Kernel's Page Dir Address
  3712                              <1> a_lfb_k_2:
  3713 00006A01 660D0304            <1> 	or	ax, PDE_A_PRESENT + PDE_A_WRITE + PDE_EXTERNAL
  3714                              <1> 				; supervisor + read&write + present 	
  3715                              <1> 				; + external memory block (LFB)
  3716 00006A05 AB                  <1> 	stosd
  3717 00006A06 0500100000          <1> 	add	eax, 4096
  3718 00006A0B E2F4                <1> 	loop	a_lfb_k_2
  3719                              <1> 	
  3720 00006A0D 5F                  <1> 	pop	edi ; start addr of contiguous memory pages
  3721 00006A0E 59                  <1> 	pop	ecx ; page table (PDE) count
  3722                              <1> 
  3723                              <1> 	; Allocate pages in (new) kernel page tables
  3724                              <1> 	
  3725                              <1> 	; (Note: page tables are contiguous in pyhsical memory)
  3726 00006A0F C1E10A              <1> 	shl	ecx, 10 ; * 1024, convert to (total) PTE count 
  3727                              <1> 	
  3728 00006A12 A1[2C120300]        <1> 	mov	eax, [LFB_ADDR]
  3729                              <1> 	; edx = LFB page count
  3730                              <1> 	;and	ax, ~4095  ; lw of LFB address is 0
  3731                              <1> a_lfb_k_3:	
  3732 00006A17 660D0304            <1> 	or	ax, PTE_A_PRESENT + PTE_A_WRITE + PTE_EXTERNAL
  3733                              <1> 				; supervisor + read&write + present 	
  3734                              <1> 				; + external memory block (LFB)
  3735 00006A1B AB                  <1> 	stosd
  3736 00006A1C 4A                  <1> 	dec	edx
  3737 00006A1D 7408                <1> 	jz	short a_lfb_k_4 ; LFB size has been completed (!?)
  3738 00006A1F 0500100000          <1> 	add	eax, 4096	
  3739 00006A24 E2F1                <1> 	loop	a_lfb_k_3
  3740                              <1> 
  3741 00006A26 C3                  <1> 	retn
  3742                              <1> 	
  3743                              <1> a_lfb_k_4:
  3744                              <1> 	; clear PTEs for empty/free pages 
  3745                              <1> 	; 	(if there are after LFB !?)
  3746 00006A27 31C0                <1> 	xor	eax, eax ; clear page table entry (empty)
  3747 00006A29 F3AB                <1> 	rep	stosd
  3748 00006A2B C3                  <1> 	retn
  3749                              <1> 
  3750                              <1> ;deallocate_lfb_pages_for_kernel:
  3751                              <1> 	; 15/12/2020
  3752                              <1> 	; 14/12/2020 - TRDOS 386 v2.0.3
  3753                              <1> 	; Reset/Release kernel page tables
  3754                              <1> 	;	 which are used for linear frame buffer 
  3755                              <1> 	; (this procedure will be called by kernel only)
  3756                              <1> 	;
  3757                              <1> 	; Input:
  3758                              <1> 	;	[LFB_ADDR] = linear frame buffer base address
  3759                              <1>  	;	[FFB_SIZE] = linear frame buffer size in bytes
  3760                              <1> 	; Output:
  3761                              <1> 	;	none
  3762                              <1> 	;
  3763                              <1> 	; Modified registers: eax, ecx, edi
  3764                              <1> 
  3765                              <1> 	;mov	edi, [LFB_ADDR]
  3766                              <1> 	;mov	ecx, [LFB_SIZE]
  3767                              <1> 	;
  3768                              <1> 	;shr	edi, 22	; convert address to page number
  3769                              <1> 	;		; and then convert it to PDE entry offset
  3770                              <1> 	;		; (1 PDE is for 4MB, 22 bit shift)
  3771                              <1> 	;
  3772                              <1> 	;shl	di, 2	; * 4 for offset 
  3773                              <1> 	;
  3774                              <1> 	;;add	ecx, 4095
  3775                              <1> 	;shr	ecx, 12	; convert LFB size to page count  
  3776                              <1> 	;
  3777                              <1> 	;add	ecx, 1023 ; page count + 1023
  3778                              <1> 	;shr	ecx, 10 ; convert to page directory entry count	
  3779                              <1> 	;		; (page table count)
  3780                              <1> 	;push	ecx ; *
  3781                              <1> 	;shl	ecx, 12 ; convert to byte count
  3782                              <1> 	;
  3783                              <1> 	;xor	eax, eax ; first available pages
  3784                              <1> 	;
  3785                              <1> 	;; deallocate contiguous memory block for kernel pages
  3786                              <1> 	;
  3787                              <1> 	;call	deallocate_memory_block
  3788                              <1> 	;
  3789                              <1> 	;pop	ecx ; * ; PDE count
  3790                              <1> 	;
  3791                              <1> 	;; Release/Free PDEs (page tables) in kernel's page dir
  3792                              <1> 	;; edi = 1st page directory entry offset
  3793                              <1> 	;add	edi, [k_page_dir] ; Kernel's Page Dir Address
  3794                              <1> 	;sub	eax, eax ; clear (also invalidate)
  3795                              <1> 	;rep	stosd
  3796                              <1> 	;
  3797                              <1> 	;retn
  3798                              <1> 
  3799                              <1> ; /// End Of MEMORY MANAGEMENT FUNCTIONS ///
  3800                              <1> 
  3801                              <1> ;; Data:
  3802                              <1> 
  3803                              <1> ; 09/03/2015
  3804                              <1> ;swpq_count: dw 0 ; count of pages on the swap que
  3805                              <1> ;swp_drv:    dd 0 ; logical drive description table address of the swap drive/disk
  3806                              <1> ;swpd_size:  dd 0 ; size of swap drive/disk (volume) in sectors (512 bytes). 		  				
  3807                              <1> ;swpd_free:  dd 0 ; free page blocks (4096 bytes) on swap disk/drive (logical)
  3808                              <1> ;swpd_next:  dd 0 ; next free page block
  3809                              <1> ;swpd_last:  dd 0 ; last swap page block
  2888                                  %include 'timer.s'   ; 17/01/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - timer.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 15/01/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 17/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ;
    15                              <1> ; Derived from 'IBM PC-AT' BIOS source code (1985) 
    16                              <1> ; ****************************************************************************
    17                              <1> 
    18                              <1> ; TRDOS 386  (TRDOS v2.0) Kernel - TIMER & REAL TIME CLOCK (BIOS) FUNCTIONS
    19                              <1> 
    20                              <1> ; IBM PC-AT BIOS Source Code ('BIOS2.ASM')
    21                              <1> ; TITLE BIOS2 ---- 06/10/85 BIOS INTERRUPT ROUTINES
    22                              <1> 
    23                              <1> ;
    24                              <1> ; ///////// TIMER (& REAL TIME CLOCK) FUNCTIONS ///////////////
    25                              <1> 
    26                              <1> int1Ah:
    27                              <1> 	; 29/01/2016
    28                              <1> 	; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
    29 00006A2C 9C                  <1> 	pushfd
    30 00006A2D 0E                  <1> 	push 	cs
    31 00006A2E E801000000          <1> 	call 	TIME_OF_DAY_1
    32 00006A33 C3                  <1> 	retn
    33                              <1> 
    34                              <1> ;--- INT  1A H -- (TIME OF DAY) -------------------------------------------------
    35                              <1> ;       THIS BIOS ROUTINE ALLOWS THE CLOCKS TO BE SET OR READ			:
    36                              <1> ;										:
    37                              <1> ; PARAMETERS:									:
    38                              <1> ;     (AH) = 00H  READ THE CURRENT SETTING AND RETURN WITH,			:
    39                              <1> ;                      (CX) = HIGH PORTION OF COUNT				:
    40                              <1> ;                      (DX) = LOW PORTION OF COUNT				:
    41                              <1> ;                      (AL) = 0 TIMER HAS NOT PASSED 24 HOURS SINCE LAST READ	:
    42                              <1> ;                             1 IF ON ANOTHER DAY. (RESET TO ZERO AFTER READ)	:
    43                              <1> ;										:
    44                              <1> ;     (AH) = 01H  SET THE CURRENT CLOCK USING,					:
    45                              <1> ;		     (CX) = HIGH PORTION OF COUNT				:
    46                              <1> ;		     (DX) = LOW PORTION OF COUNT.				:
    47                              <1> ;										:
    48                              <1> ;               NOTE: COUNTS OCCUR AT THE RATE OF 1193180/65536 COUNTS/SECOND	:
    49                              <1> ;                            (OR ABOUT 18.2 PER SECOND -- SEE EQUATES)		:
    50                              <1> ;										:
    51                              <1> ;     (AH) = 02H  READ THE REAL TIME CLOCK AND RETURN WITH,			:
    52                              <1> ;                      (CH) = HOURS IN BCD (00-23)				:
    53                              <1> ;                      (CL) = MINUTES IN BCD (00-59)				:
    54                              <1> ;                      (DH) = SECONDS IN BCD (00-59)				:
    55                              <1> ;                      (DL) = DAYLIGHT SAVINGS ENABLE (00-01)			:
    56                              <1> ;										:
    57                              <1> ;     (AH) = 03H  SET THE REAL TIME CLOCK USING,				:
    58                              <1> ;                     (CH) = HOURS IN BCD (00-23)				:
    59                              <1> ;                     (CL) = MINUTES IN BCD (00-59)				:
    60                              <1> ;                     (DH) = SECONDS IN BCD (00-59)				:
    61                              <1> ;                     (DL) = 01 IF DAYLIGHT SAVINGS ENABLE OPTION, ELSE 00.	:
    62                              <1> ;										:
    63                              <1> ;             NOTE: (DL) = 00 IF DAYLIGHT SAVINGS TIME ENABLE IS NOT ENABLED.	:
    64                              <1> ;                   (DL) = 01 ENABLES TWO SPECIAL UPDATES THE LAST SUNDAY IN	:
    65                              <1> ;	           APRIL   (1:59:59 --> 3:00:00 AM) AND THE LAST SUNDAY IN	:
    66                              <1> ;                   OCTOBER (1:59:59 --> 1:00:00 AM) THE FIRST TIME.		:
    67                              <1> ;										:
    68                              <1> ;     (AH) = 04H  READ THE DATE FROM THE REAL TIME CLOCK AND RETURN WITH,	:
    69                              <1> ;                      (CH) = CENTURY IN BCD (19 OR 20)				:
    70                              <1> ;                      (CL) = YEAR IN BCD (00-99)				:
    71                              <1> ;                      (DH) = MONTH IN BCD (01-12)				:
    72                              <1> ;                      (DL) = DAY IN BCD (01-31).				:
    73                              <1> ;										:
    74                              <1> ;     (AH) = 05H  SET THE DATE INTO THE REAL TIME CLOCK USING,			:
    75                              <1> ;                     (CH) = CENTURY IN BCD (19 OR 20)				:
    76                              <1> ;                     (CL) = YEAR IN BCD (00-99)				:
    77                              <1> ;                     (DH) = MONTH IN BCD (01-12)				:
    78                              <1> ;                     (DL) = DAY IN BCD (01-31).				:
    79                              <1> ;										:
    80                              <1> ;     (AH) = 06H  SET THE ALARM TO INTERRUPT AT SPECIFIED TIME,			:
    81                              <1> ;                     (CH) = HOURS IN BCD (00-23 (OR FFH))			:
    82                              <1> ;                     (CL) = MINUTES IN BCD (00-59 (OR FFH))			:
    83                              <1> ;                     (DH) = SECONDS IN BCD (00-59 (OR FFH))			:
    84                              <1> ;										:
    85                              <1> ;     (AH) = 07H  RESET THE ALARM INTERRUPT FUNCTION.				:
    86                              <1> ;										:
    87                              <1> ; NOTES: FOR ALL RETURNS CY= 0 FOR SUCCESSFUL OPERATION.			:
    88                              <1> ;        FOR (AH)= 2, 4, 6 - CARRY FLAG SET IF REAL TIME CLOCK NOT OPERATING.	:
    89                              <1> ;        FOR (AH)= 6 - CARRY FLAG SET IF ALARM ALREADY ENABLED. 		:
    90                              <1> ;        FOR THE ALARM FUNCTION (AH = 6) THE USER MUST SUPPLY A ROUTINE AND	:
    91                              <1> ;         INTERCEPT THE CORRECT ADDRESS IN THE VECTOR TABLE FOR INTERRUPT 4AH.	:
    92                              <1> ;         USE 0FFH FOR ANY "DO NOT CARE" POSITION FOR INTERVAL INTERRUPTS.	:
    93                              <1> ;        INTERRUPTS ARE DISABLED DURING DATA MODIFICATION. 			:
    94                              <1> ;        AH & AL ARE RETURNED MODIFIED AND NOT DEFINED EXCEPT WHERE INDICATED.	:
    95                              <1> ;--------------------------------------------------------------------------------
    96                              <1> 
    97                              <1> ; 15/01/2017
    98                              <1> ; 14/01/2017
    99                              <1> ; 07/01/2017
   100                              <1> ; 02/01/2017
   101                              <1> ; 29/05/2016
   102                              <1> ; 29/01/2016
   103                              <1> ; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
   104                              <1> 
   105                              <1> ; 29/05/2016
   106                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   107                              <1> int35h:  ; Date/Time functions
   108                              <1> 
   109                              <1> TIME_OF_DAY_1:
   110                              <1> 	;sti				; INTERRUPTS BACK ON
   111                              <1> 	; 29/05/2016
   112 00006A34 80642408FE          <1> 	and	byte [esp+8], 11111110b	; clear carry bit of eflags register
   113                              <1> 	;
   114 00006A39 80FC08              <1> 	cmp	ah, (RTC_TBE-RTC_TB)/4	; CHECK IF COMMAND IN VALID RANGE (0-7)
   115 00006A3C F5                  <1> 	cmc				; COMPLEMENT CARRY FOR ERROR EXIT
   116                              <1> 	; (*) jc short TIME_9		; EXIT WITH CARRY = 1 IF NOT VALID
   117 00006A3D 721A                <1> 	jc	short _TIME_9 ; 29/05/2016
   118                              <1> 
   119 00006A3F 1E                  <1> 	push	ds
   120 00006A40 56                  <1> 	push	esi
   121 00006A41 66BE1000            <1> 	mov	si, KDATA		; kernel data segment
   122 00006A45 8EDE                <1> 	mov	ds, si
   123                              <1> 
   124                              <1> 	;;15/01/2017
   125                              <1> 	; 14/01/2017
   126                              <1> 	; 02/01/2017
   127                              <1> 	;;mov	byte [intflg], 35h	; date & time interrupt 
   128                              <1> 	;sti
   129                              <1> 	;
   130 00006A47 C0E402              <1> 	shl	ah, 2			; convert function to dword offset
   131 00006A4A 0FB6F4              <1> 	movzx	esi, ah			; PLACE INTO ADDRESSING REGISTER
   132                              <1> 	;cli				; NO INTERRUPTS DURING TIME FUNCTIONS
   133 00006A4D FF96[5F6A0000]      <1> 	call	[esi+RTC_TB]		; VECTOR TO FUNCTION REQUESTED WITH CY=0
   134                              <1> 					; RETURN WITH CARRY FLAG SET FOR RESULT
   135                              <1> 	;sti				; INTERRUPTS BACK ON
   136 00006A53 B400                <1> 	mov	ah, 0			; CLEAR (AH) TO ZERO
   137 00006A55 5E                  <1> 	pop	esi			; RECOVER USERS REGISTER
   138 00006A56 1F                  <1> 	pop	ds			; RECOVER USERS SEGMENT SELECTOR
   139                              <1> 
   140                              <1> 	;;15/01/2017
   141                              <1> 	; 02/01/2017
   142                              <1> 	;;mov	byte [ss:intflg], 0 ; 07/01/2017
   143                              <1> 
   144                              <1> ;TIME_9:
   145                              <1> 					; RETURN WITH CY= 0 IF NO ERROR
   146                              <1> 	; (*) 29/05/2016
   147                              <1> 	; (*) retf 4 ; skip eflags on stack
   148 00006A57 7305                <1> 	jnc	short _TIME_10
   149                              <1> _TIME_9:
   150                              <1> 	; 29/05/2016 -set carry flag on stack-
   151                              <1> 	; [esp] = EIP
   152                              <1> 	; [esp+4] = CS
   153                              <1> 	; [esp+8] = E-FLAGS
   154 00006A59 804C240801          <1> 	or	byte [esp+8], 1	 ; set carry bit of eflags register
   155                              <1> 	; [esp+12] = ESP (user)
   156                              <1> 	; [esp+16] = SS (User)
   157                              <1> _TIME_10:
   158 00006A5E CF                  <1> 	iretd
   159                              <1> 	
   160                              <1> 	; (*) 29/05/2016 - 'ref 4' intruction causes to stack fault
   161                              <1> 	; (OUTER-PRIVILEGE-LEVEL)
   162                              <1> 	; INTEL 80386 PROGRAMMER'S REFERENCE MANUAL 1986
   163                              <1> 	; // RETF instruction:
   164                              <1> 	;
   165                              <1> 	; IF OperandMode=32 THEN
   166                              <1>  	;    Load CS:EIP from stack;
   167                              <1>  	;    Set CS RPL to CPL;
   168                              <1>  	;    Increment eSP by 8 plus the immediate offset if it exists;
   169                              <1>  	;    Load SS:eSP from stack;
   170                              <1>  	; ELSE (* OperandMode=16 *)
   171                              <1>  	;    Load CS:IP from stack;
   172                              <1>  	;    Set CS RPL to CPL;
   173                              <1>  	;    Increment eSP by 4 plus the immediate offset if it exists;
   174                              <1> 	;    Load SS:eSP from stack;
   175                              <1>  	; FI;
   176                              <1> 	;
   177                              <1> 	; //					
   178                              <1> 					; ROUTINE VECTOR TABLE (AH)=
   179                              <1> RTC_TB:
   180 00006A5F [7F6A0000]          <1> 	dd	RTC_00			; 0 = READ CURRENT CLOCK COUNT
   181 00006A63 [926A0000]          <1> 	dd	RTC_10			; 1 = SET CLOCK COUNT
   182 00006A67 [A06A0000]          <1> 	dd	RTC_20			; 2 = READ THE REAL TIME CLOCK TIME
   183 00006A6B [CF6A0000]          <1> 	dd	RTC_30			; 3 = SET REAL TIME CLOCK TIME
   184 00006A6F [116B0000]          <1> 	dd	RTC_40			; 4 = READ THE REAL TIME CLOCK DATE
   185 00006A73 [3E6B0000]          <1> 	dd	RTC_50			; 5 = SET REAL TIME CLOCK DATE
   186 00006A77 [8B6B0000]          <1> 	dd	RTC_60			; 6 = SET THE REAL TIME CLOCK ALARM
   187 00006A7B [DE6B0000]          <1> 	dd	RTC_70			; 7 = RESET ALARM
   188                              <1> 
   189                              <1> RTC_TBE	equ	$
   190                              <1> 
   191                              <1> RTC_00:				; READ TIME COUNT
   192 00006A7F A0[14820100]        <1> 	mov	al, [TIMER_OFL]		; GET THE OVERFLOW FLAG
   193 00006A84 C605[14820100]00    <1> 	mov	byte [TIMER_OFL], 0	; AND THEN RESET THE OVERFLOW FLAG
   194 00006A8B 8B0D[10820100]      <1>         mov     ecx, [TIMER_LH]         ; GET COUNT OF TIME
   195 00006A91 C3                  <1> 	retn
   196                              <1> 
   197                              <1> RTC_10:				; SET TIME COUNT
   198 00006A92 890D[10820100]      <1>         mov     [TIMER_LH], ecx         ; SET TIME COUNT
   199 00006A98 C605[14820100]00    <1> 	mov	byte [TIMER_OFL], 0	; RESET OVERFLOW FLAG
   200 00006A9F C3                  <1> 	retn				; RETURN WITH NO CARRY
   201                              <1> 
   202                              <1> RTC_20:				; GET RTC TIME
   203 00006AA0 E8EB010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   204 00006AA5 7227                <1> 	jc	short RTC_29		; EXIT IF ERROR (CY= 1)
   205                              <1> 
   206 00006AA7 B000                <1> 	mov	al, CMOS_SECONDS	; SET ADDRESS OF SECONDS
   207 00006AA9 E8FD010000          <1> 	call	CMOS_READ		; GET SECONDS
   208 00006AAE 88C6                <1> 	mov	dh, al			; SAVE
   209 00006AB0 B00B                <1> 	mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   210 00006AB2 E8F4010000          <1> 	call	CMOS_READ		; READ CURRENT VALUE OF DSE BIT
   211 00006AB7 2401                <1> 	and	al, 00000001b		; MASK FOR VALID DSE BIT
   212 00006AB9 88C2                <1> 	mov	dl, al			; SET [DL] TO ZERO FOR NO DSE BIT
   213 00006ABB B002                <1> 	mov	al, CMOS_MINUTES	; SET ADDRESS OF MINUTES
   214 00006ABD E8E9010000          <1> 	call	CMOS_READ		; GET MINUTES
   215 00006AC2 88C1                <1> 	mov	cl, al			; SAVE
   216 00006AC4 B004                <1>         mov     al, CMOS_HOURS          ; SET ADDRESS OF HOURS
   217 00006AC6 E8E0010000          <1> 	call	CMOS_READ		; GET HOURS
   218 00006ACB 88C5                <1> 	mov	ch, al			; SAVE
   219 00006ACD F8                  <1> 	clc				; SET CY= 0
   220                              <1> RTC_29:
   221 00006ACE C3                  <1> 	retn				; RETURN WITH RESULT IN CARRY FLAG
   222                              <1> 
   223                              <1> RTC_30:				; SET RTC TIME
   224 00006ACF E8BC010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   225 00006AD4 7305                <1> 	jnc	short RTC_35		; GO AROUND IF CLOCK OPERATING
   226 00006AD6 E817010000          <1> 	call	RTC_STA			; ELSE TRY INITIALIZING CLOCK
   227                              <1> RTC_35:
   228 00006ADB 88F4                <1> 	mov	ah, dh			; GET TIME BYTE - SECONDS
   229 00006ADD B000                <1> 	mov	al, CMOS_SECONDS	; ADDRESS SECONDS
   230 00006ADF E8E0010000          <1> 	call	CMOS_WRITE		; UPDATE SECONDS
   231 00006AE4 88CC                <1> 	mov	ah, cl			; GET TIME BYTE - MINUTES
   232 00006AE6 B002                <1> 	mov	al, CMOS_MINUTES	; ADDRESS MINUTES
   233 00006AE8 E8D7010000          <1> 	call	CMOS_WRITE		; UPDATE MINUTES
   234 00006AED 88EC                <1> 	mov	ah, ch			; GET TIME BYTE - HOURS
   235 00006AEF B004                <1> 	mov	al, CMOS_HOURS		; ADDRESS HOURS
   236 00006AF1 E8CE010000          <1> 	call	CMOS_WRITE		; UPDATE ADDRESS
   237                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   238                              <1> 	;mov	ah, al
   239 00006AF6 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   240 00006AFA E8AC010000          <1> 	call	CMOS_READ		; READ CURRENT TIME
   241 00006AFF 2462                <1> 	and	al, 01100010b		; MASK FOR VALID BIT POSITIONS
   242 00006B01 0C02                <1> 	or	al, 00000010b		; TURN ON 24 HOUR MODE
   243 00006B03 80E201              <1> 	and	dl, 00000001b		; USE ONLY THE DSE BIT
   244 00006B06 08D0                <1> 	or	al, dl			; GET DAY LIGHT SAVINGS TIME BIT (OSE)
   245 00006B08 86E0                <1> 	xchg	ah, al			; PLACE IN WORK REGISTER AND GET ADDRESS
   246 00006B0A E8B5010000          <1> 	call	CMOS_WRITE		; SET NEW ALARM SITS
   247 00006B0F F8                  <1> 	clc				; SET CY= 0
   248 00006B10 C3                  <1> 	retn				; RETURN WITH CY= 0
   249                              <1> 
   250                              <1> RTC_40:				; GET RTC DATE
   251 00006B11 E87A010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   252 00006B16 7225                <1> 	jc	short RTC_49		; EXIT IF ERROR (CY= 1)
   253                              <1> 
   254 00006B18 B007                <1> 	mov	al, CMOS_DAY_MONTH	; ADDRESS DAY OF MONTH
   255 00006B1A E88C010000          <1> 	call	CMOS_READ		; READ DAY OF MONTH
   256 00006B1F 88C2                <1> 	mov	dl, al			; SAVE
   257 00006B21 B008                <1> 	mov	al, CMOS_MONTH		; ADDRESS MONTH
   258 00006B23 E883010000          <1> 	call	CMOS_READ		; READ MONTH
   259 00006B28 88C6                <1> 	mov	dh, al			; SAVE
   260 00006B2A B009                <1> 	mov	al, CMOS_YEAR		; ADDRESS YEAR
   261 00006B2C E87A010000          <1> 	call	CMOS_READ		; READ YEAR
   262 00006B31 88C1                <1> 	mov	cl, al			; SAVE
   263 00006B33 B032                <1> 	mov	al, CMOS_CENTURY	; ADDRESS CENTURY LOCATION
   264 00006B35 E871010000          <1> 	call	CMOS_READ		; GET CENTURY BYTE
   265 00006B3A 88C5                <1> 	mov	ch, al			; SAVE
   266 00006B3C F8                  <1> 	clc				; SET CY=0
   267                              <1> RTC_49:
   268 00006B3D C3                  <1> 	retn				; RETURN WITH RESULTS IN CARRY FLAG
   269                              <1> 
   270                              <1> RTC_50:				; SET RTC DATE
   271 00006B3E E84D010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   272 00006B43 7305                <1> 	jnc	short RTC_55		; GO AROUND IF NO ERROR
   273 00006B45 E8A8000000          <1> 	call	RTC_STA			; ELSE INITIALIZE CLOCK
   274                              <1> RTC_55:
   275 00006B4A 66B80600            <1> 	mov	ax, CMOS_DAY_WEEK	; ADDRESS OF DAY OF WEEK BYTE
   276 00006B4E E871010000          <1> 	call	CMOS_WRITE		; LOAD ZEROS TO DAY OF WEEK
   277 00006B53 88D4                <1> 	mov	ah, dl			; GET DAY OF MONTH BYTE
   278 00006B55 B007                <1> 	mov	al, CMOS_DAY_MONTH	; ADDRESS DAY OF MONTH BYTE
   279 00006B57 E868010000          <1> 	call	CMOS_WRITE		; WRITE OF DAY OF MONTH REGISTER
   280 00006B5C 88F4                <1> 	mov	ah, dh			; GET MONTH
   281 00006B5E B008                <1> 	mov	al, CMOS_MONTH		; ADDRESS MONTH BYTE
   282 00006B60 E85F010000          <1> 	call	CMOS_WRITE		; WRITE MONTH REGISTER
   283 00006B65 88CC                <1> 	mov	ah, cl			; GET YEAR BYTE
   284 00006B67 B009                <1> 	mov	al, CMOS_YEAR		; ADDRESS YEAR REGISTER
   285 00006B69 E856010000          <1> 	call	CMOS_WRITE		; WRITE YEAR REGISTER
   286 00006B6E 88EC                <1> 	mov	ah, ch			; GET CENTURY BYTE
   287 00006B70 B032                <1> 	mov	al, CMOS_CENTURY	; ADDRESS CENTURY BYTE
   288 00006B72 E84D010000          <1> 	call	CMOS_WRITE		; WRITE CENTURY LOCATION
   289                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   290                              <1> 	;mov	ah, al
   291 00006B77 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   292 00006B7B E82B010000          <1> 	call	CMOS_READ		; READ WIRRENT SETTINGS
   293 00006B80 247F                <1> 	and	al, 07Fh		; CLEAR 'SET BIT'
   294 00006B82 86E0                <1> 	xchg	ah, al			; MOVE TO WORK REGISTER
   295 00006B84 E83B010000          <1> 	call	CMOS_WRITE		; AND START CLOCK UPDATING
   296 00006B89 F8                  <1> 	clc				; SET CY= 0
   297 00006B8A C3                  <1> 	retn				; RETURN CY=0
   298                              <1> 
   299                              <1> RTC_60:				; SET RTC ALARM
   300 00006B8B B00B                <1> 	mov	al, CMOS_REG_B		; ADDRESS ALARM
   301 00006B8D E819010000          <1> 	call	CMOS_READ		; READ ALARM REGISTER
   302 00006B92 A820                <1> 	test	al, 20h			; CHECK FOR ALARM ALREADY ENABLED
   303 00006B94 F9                  <1> 	stc				; SET CARRY IN CASE OF ERROR
   304 00006B95 7542                <1> 	jnz	short RTC_69		; ERROR EXIT IF ALARM SET
   305 00006B97 E8F4000000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   306 00006B9C 7305                <1> 	jnc	short RTC_65		; SKIP INITIALIZATION IF NO ERROR
   307 00006B9E E84F000000          <1> 	call	RTC_STA			; ELSE INITIALIZE CLOCK
   308                              <1> RTC_65:	
   309 00006BA3 88F4                <1> 	mov	ah, dh			; GET SECONDS BYTE
   310 00006BA5 B001                <1> 	mov	al, CMOS_SEC_ALARM	; ADDRESS THE SECONDS ALARM REGISTER
   311 00006BA7 E818010000          <1> 	call	CMOS_WRITE		; INSERT SECONDS
   312 00006BAC 88CC                <1> 	mov	ah, cl			; GET MINUTES PARAMETER
   313 00006BAE B003                <1> 	mov	al, CMOS_MIN_ALARM	; ADDRESS MINUTES ALARM REGISTER
   314 00006BB0 E80F010000          <1> 	call	CMOS_WRITE		; INSERT MINUTES
   315 00006BB5 88EC                <1> 	mov	ah, ch			; GET HOURS PARAMETER
   316 00006BB7 B005                <1> 	mov	al, CMOS_HR_ALARM	; ADDRESS HOUR ALARM REGISTER
   317 00006BB9 E806010000          <1> 	call	CMOS_WRITE		; INSERT HOURS
   318 00006BBE E4A1                <1> 	in	al, INTB01		; READ SECOND INTERRUPT MASK REGISTER
   319 00006BC0 24FE                <1> 	and	al, 0FEh		; ENABLE ALARM TIMER BIT (CY= 0)
   320 00006BC2 E6A1                <1> 	out	INTB01, al		; WRITE UPDATED MASK
   321                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   322                              <1> 	;mov	ah, al
   323 00006BC4 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   324 00006BC8 E8DE000000          <1> 	call	CMOS_READ		; READ CURRENT ALARM REGISTER
   325 00006BCD 247F                <1> 	and	al, 07Fh		; ENSURE SET BIT TURNED OFF
   326 00006BCF 0C20                <1> 	or	al, 20h			; TURN ON ALARM ENABLE
   327 00006BD1 86E0                <1> 	xchg	ah, al			; MOVE MASK TO OUTPUT REGISTER
   328 00006BD3 E8EC000000          <1> 	call	CMOS_WRITE		; WRITE NEW ALARM MASK
   329 00006BD8 F8                  <1> 	clc				; SET CY= 0
   330                              <1> RTC_69:
   331 00006BD9 66B80000            <1> 	mov	ax, 0			; CLEAR AX REGISTER
   332 00006BDD C3                  <1> 	retn				; RETURN WITH RESULTS IN CARRY FLAC
   333                              <1> 
   334                              <1> RTC_70:				; RESET ALARM
   335                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   336                              <1> 	;mov	ah, al
   337 00006BDE 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257	; ADDRESS ALARM REGISTER (TO BOTH AH,AL)
   338 00006BE2 E8C4000000          <1> 	call	CMOS_READ		; READ ALARM REGISTER
   339 00006BE7 2457                <1> 	and	al, 57h			; TURN OFF ALARM ENABLE
   340 00006BE9 86E0                <1> 	xchg	ah, al			; SAVE DATA AND RECOVER ADDRESS
   341 00006BEB E8D4000000          <1> 	call	CMOS_WRITE		; RESTORE NEW VALUE
   342 00006BF0 F8                  <1> 	clc				; SET CY= 0
   343 00006BF1 C3                  <1> 	retn				; RETURN WITH NO CARRY
   344                              <1> 
   345                              <1> RTC_STA:			; INITIALIZE REAL TIME CLOCK
   346                              <1> 	;mov	al, CMOS_REG_A		; ADDRESS REGISTER A AND LOAD DATA MASK		
   347                              <1> 	;mov	ah, 26h
   348 00006BF2 66B80A26            <1> 	mov	ax, (26h*100h)+CMOS_REG_A
   349 00006BF6 E8C9000000          <1> 	call	CMOS_WRITE		; INITIALIZE STATUS REGISTER A
   350                              <1> 	;mov	al, CMOS_REG_B		; SET "SET BIT" FOR CLOCK INITIALIZATION	
   351                              <1> 	;mov	ah, 82h
   352 00006BFB 66B80B82            <1> 	mov	ax, (82h*100h)+CMOS_REG_B
   353 00006BFF E8C0000000          <1> 	call	CMOS_WRITE		; AND 24 HOUR MODE TO REGISTER B
   354 00006C04 B00C                <1> 	mov	al, CMOS_REG_C		; ADDRESS REGISTER C
   355 00006C06 E8A0000000          <1> 	call	CMOS_READ		; READ REGISTER C TO INITIALIZE
   356 00006C0B B00D                <1> 	mov	al, CMOS_REG_D		; ADDRESS REGISTER D
   357 00006C0D E899000000          <1> 	call	CMOS_READ		; READ REGISTER D TO INITIALIZE
   358 00006C12 C3                  <1> 	retn
   359                              <1> 
   360                              <1> ; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
   361                              <1> 
   362                              <1> ;--- HARDWARE INT  70 H -- ( IRQ LEVEL  8) --------------------------------------
   363                              <1> ; ALARM INTERRUPT HANDLER (RTC)							:
   364                              <1> ;       THIS ROUTINE HANDLES THE PERIODIC AND ALARM INTERRUPTS FROM THE CMOS	:
   365                              <1> ;       TIMER. INPUT FREQUENCY IS 1.024 KHZ OR APPROXIMATELY 1024 INTERRUPTS	:
   366                              <1> ;       EVERY SECOND FOR THE PERIODIC INTERRUPT. FOR THE ALARM FUNCTION,	:
   367                              <1> ;       THE INTERRUPT WILL OCCUR AT THE DESIGNATED TIME.			:
   368                              <1> ;										:
   369                              <1> ;       INTERRUPTS ARE ENABLED WHEN THE EVENT OR ALARM FUNCTION IS ACTIVATED.	:
   370                              <1> ;       FOR THE EVENT INTERRUPT, THE HANDLER WILL DECREMENT THE WAIT COUNTER	:
   371                              <1> ;       AND WHEN IT EXPIRES WILL SET THE DESIGNATED LOCATION TO 80H. FOR	:
   372                              <1> ;       THE ALARM INTERRUPT. THE USER MUST PROVIDE A ROUTINE TO INTERCEPT	:
   373                              <1> ;       THE CORRECT ADDRESS FROM THE VECTOR TABLE INVOKED BY INTERRUPT 4AH	:
   374                              <1> ;       PRIOR TO SETTING THE REAL TIME CLOCK ALARM (INT 1AH, AH= 06H).		:
   375                              <1> ;--------------------------------------------------------------------------------
   376                              <1> 
   377                              <1> RTC_A_INT: ; 07/01/2017
   378                              <1> ;RTC_INT:				; ALARM INTERRUPT
   379 00006C13 1E                  <1> 	push	ds			; LEAVE INTERRUPTS DISABLED
   380 00006C14 50                  <1> 	push	eax			; SAVE REGISTERS
   381 00006C15 57                  <1> 	push	edi
   382                              <1> RTC_I_1:				; CHECK FOR SECOND INTERRUPT
   383 00006C16 66B88C8B            <1> 	mov	ax, 256*(CMOS_REG_B+NMI)+CMOS_REG_C+NMI ; ALARM AND STATUS
   384 00006C1A E670                <1> 	out	CMOS_PORT, al		; WRITE ALARM FLAG MASK ADDRESS
   385 00006C1C 90                  <1> 	nop				; I/O DELAY
   386 00006C1D EB00                <1> 	jmp	short $+2
   387 00006C1F E471                <1> 	in	al, CMOS_DATA		; READ AND RESET INTERRUPT REQUEST FLAGS
   388 00006C21 A860                <1> 	test	al, 01100000b		; CHECK FOR EITHER INTERRUPT PENDING
   389 00006C23 745D                <1> 	jz	short	RTC_I_9		; EXIT IF NOT A VALID RTC INTERRUPT
   390                              <1> 
   391 00006C25 86E0                <1> 	xchg	ah, al			; SAVE FLAGS AND GET ENABLE ADDRESS
   392 00006C27 E670                <1> 	out	CMOS_PORT, al		; WRITE ALARM ENABLE MASK ADDRESS
   393 00006C29 90                  <1> 	nop				; I/O DELAY
   394 00006C2A EB00                <1> 	jmp	short $+2	
   395 00006C2C E471                <1> 	in	al, CMOS_DATA		; READ CURRENT ALARM ENABLE MASK
   396 00006C2E 20E0                <1> 	and	al, ah			; ALLOW ONLY SOURCES THAT ARE ENABLED
   397 00006C30 A840                <1> 	test	al, 01000000b		; CHECK FOR PERIODIC INTERRUPT
   398 00006C32 743B                <1> 	jz	short RTC_I_5		; SKIP IF NOT A PERIODIC INTERRUPT
   399                              <1> 
   400                              <1> ;-----	DECREMENT WAIT COUNT BY INTERRUPT INTERVAL
   401                              <1> 
   402 00006C34 66BF1000            <1> 	mov	di, KDATA		; kernel data segment
   403 00006C38 8EDF                <1> 	mov	ds, di
   404                              <1> 	
   405 00006C3A 812D[08820100]D003- <1> 	sub	dword [RTC_LH], 976	; DECREMENT COUNT BY 1/1024
   405 00006C42 0000                <1>
   406 00006C44 7329                <1> 	jnc	short RTC_I_5		; SKIP TILL 32 BIT WORD LESS THAN ZERO
   407                              <1> 
   408                              <1> ;-----	TURN OFF PERIODIC INTERRUPT ENABLE
   409                              <1> 
   410 00006C46 6650                <1> 	push	ax			; SAVE INTERRUPT FLAG MASK
   411 00006C48 66B88B8B            <1> 	mov	ax, 257*(CMOS_REG_B+NMI) ; INTERRUPT ENABLE REGISTER
   412 00006C4C E670                <1> 	out	CMOS_PORT, al		; WRITE ADDRESS TO CMOS CLOCK
   413 00006C4E 90                  <1> 	nop				; I/O DELAY
   414 00006C4F EB00                <1> 	jmp	short $+2
   415 00006C51 E471                <1> 	in	al, CMOS_DATA		; READ CURRENT ENABLES
   416 00006C53 24BF                <1> 	and	al, 0BFh		; TURN OFF PIE
   417 00006C55 86C4                <1> 	xchg	al, ah			; GET CMOS ADDRESS AND SAVE VALUE
   418 00006C57 E670                <1> 	out	CMOS_PORT, al		; ADDRESS REGISTER B
   419 00006C59 86C4                <1> 	xchg	al, ah			; GET NEW INTERRUPT ENABLE MASK
   420 00006C5B E671                <1> 	out	CMOS_DATA, al		; SET MASK IN INTERRUPT ENABLE REGISTER
   421 00006C5D C605[0C820100]00    <1> 	mov	byte [RTC_WAIT_FLAG], 0	; SET FUNCTION ACTIVE FLAG OFF
   422 00006C64 8B3D[0D820100]      <1> 	mov	edi, [USER_FLAG]	; SET UP (DS:DI) TO POINT TO USER FLAG
   423 00006C6A C60780              <1> 	mov	byte [edi], 80h		; TURN ON USERS FLAG
   424 00006C6D 6658                <1> 	pop	ax			; GET INTERRUPT SOURCE BACK
   425                              <1> RTC_I_5:
   426 00006C6F A820                <1> 	test	al, 00100000b		; TEST FOR ALARM INTERRUPT
   427 00006C71 740D                <1> 	jz	short RTC_I_7		; SKIP USER INTERRUPT CALL IF NOT ALARM
   428                              <1> 
   429 00006C73 B00D                <1> 	mov	al, CMOS_REG_D		; POINT TO DEFAULT READ ONLY REGISTER
   430 00006C75 E670                <1> 	out	CMOS_PORT, al		; ENABLE NMI AND CMOS ADDRESS TO DEFAULT
   431 00006C77 FB                  <1> 	sti				; INTERRUPTS BACK ON NOW
   432 00006C78 52                  <1> 	push	edx
   433 00006C79 E89CB80000          <1> 	call	INT4Ah			; TRANSFER TO USER ROUTINE
   434 00006C7E 5A                  <1> 	pop	edx
   435 00006C7F FA                  <1> 	cli				; BLOCK INTERRUPT FOR RETRY
   436                              <1> RTC_I_7:				; RESTART ROUTINE TO HANDLE DELAYED
   437 00006C80 EB94                <1> 	jmp	short RTC_I_1		;  ENTRY AND SECOND EVENT BEFORE DONE
   438                              <1> 
   439                              <1> RTC_I_9:				; EXIT - NO PENDING INTERRUPTS
   440 00006C82 B00D                <1> 	mov	al, CMOS_REG_D		; POINT TO DEFAULT READ ONLY REGISTER
   441 00006C84 E670                <1> 	out	CMOS_PORT, al		; ENABLE NMI AND CMOS ADDRESS TO DEFAULT
   442 00006C86 B020                <1> 	mov	al, EOI			; END OF INTERRUPT MASK TO 8259 - 2
   443 00006C88 E6A0                <1> 	out	INTB00, al		; TO 8259 - 2
   444 00006C8A E620                <1> 	out	INTA00,	al		; TO 8259 - 1
   445 00006C8C 5F                  <1> 	pop	edi			; RESTORE REGISTERS
   446 00006C8D 58                  <1> 	pop	eax
   447 00006C8E 1F                  <1> 	pop	ds
   448 00006C8F CF                  <1> 	iretd				; END OF INTERRUPT
   449                              <1> 
   450                              <1> 	
   451                              <1> 	; 29/05/2016 - TRDOS 386 (TRDOS v2.0)
   452                              <1> 	; 22/08/2014 (Retro UNIX 386 v1)
   453                              <1> 	; IBM PC/AT BIOS source code ----- 10/06/85 (bios2.asm)
   454                              <1> UPD_IPR:				; WAIT TILL UPDATE NOT IN PROGRESS
   455 00006C90 51                  <1> 	push	ecx
   456                              <1> 
   457                              <1> 	; 29/05/2016
   458 00006C91 B968110000          <1> 	mov	ecx, ((1984+244)*4)/2	; AWARD BIOS 1999, ATIME.ASM		
   459                              <1> 					; 'WAITCPU_CK_UD_STAT'
   460                              <1> 					; (244Us + 1984Us)
   461                              <1> 					; (assume each read takes
   462                              <1> 					;  2 microseconds).
   463                              <1> 	;mov	ecx, 65535		
   464                              <1> 		;mov cx, 800		; SET TIMEOUT LOOP COUNT (= 800)	
   465                              <1> UPD_10:
   466 00006C96 B00A                <1> 	mov	al, CMOS_REG_A		; ADDRESS STATUS REGISTER A
   467 00006C98 FA                  <1> 	cli				; NO TIMER INTERRUPTS DURING UPDATES
   468 00006C99 E80D000000          <1> 	call	CMOS_READ		; READ UPDATE IN PROCESS FLAG
   469 00006C9E A880                <1> 	test	al, 80h			; IF UIP BIT IS ON ( CANNOT READ TIME )
   470 00006CA0 7406                <1> 	jz	short UPD_90		; EXIT WITH CY= 0 IF CAN READ CLOCK NOW
   471 00006CA2 FB                  <1> 	sti				; ALLOW INTERRUPTS WHILE WAITING
   472 00006CA3 E2F1                <1> 	loop	UPD_10			; LOOP TILL READY OR TIMEOUT
   473 00006CA5 31C0                <1> 	xor	eax, eax		; CLEAR RESULTS IF ERROR
   474                              <1> 		; xor ax, ax
   475 00006CA7 F9                  <1> 	stc				; SET CARRY FOR ERROR
   476                              <1> UPD_90:
   477 00006CA8 59                  <1> 	pop	ecx			; RESTORE CALLERS REGISTER
   478 00006CA9 FA                  <1> 	cli				; INTERRUPTS OFF DURING SET
   479 00006CAA C3                  <1> 	retn				; RETURN WITH CY FLAG SET
   480                              <1> 
   481                              <1> 
   482                              <1> 	; 29/05/2016 - TRDOS 386 (TRDOS v2.0) 
   483                              <1> 	; 22/08/2014 (Retro UNIX 386 v1)
   484                              <1> 	; IBM PC/AT BIOS source code ----- 10/06/85 (test4.asm)
   485                              <1> 
   486                              <1> ;--- CMOS_READ -----------------------------------------------------------------
   487                              <1> ;		READ BYTE FROM CMOS_SYSTEM CLOCK CONFIGURATION TABLE	       :
   488                              <1> ;									       :
   489                              <1> ; INPUT: (AL)=	CMOS_TABLE ADDRESS TO BE READ				       :
   490                              <1> ;		BIT    7 = 0 FOR NMI ENABLED AND 1 FOR NMI DISABLED ON EXIT    :
   491                              <1> ;		BITS 6-0 = ADDRESS OF TABLE LOCATION TO READ		       :
   492                              <1> ;									       :
   493                              <1> ; OUTPUT: (AL)	VALUE AT LOCATION (AL) MOVED INTO (AL). IF BIT 7 OF (AL) WAS   :
   494                              <1> ;		ON THEN NMI LEFT DISABLED, DURING THE CMOS READ BOTH NMI AND   :
   495                              <1> ;		NORMAL INTERRUPTS ARE DISABLED TO PROTECT CMOS DATA INTEGRITY. :
   496                              <1> ;		THE CMOS ADDRESS REGISTER IS POINTED TO A DEFAULT VALUE AND    :
   497                              <1> ;		THE INTERRUPT FLAG RESTORED TO THE ENTRY STATE ON RETURN.      :
   498                              <1> ;		ONLY THE (AL) REGISTER AND THE NMI STATE IS CHANGED.	       :
   499                              <1> ;-------------------------------------------------------------------------------
   500                              <1> 
   501                              <1> CMOS_READ:
   502 00006CAB 9C                  <1> 	pushf				; SAVE INTERRUPT ENABLE STATUS AND FLAGS
   503 00006CAC D0C0                <1> 	rol	al, 1			; MOVE NMI BIT TO LOW POSITION
   504 00006CAE F9                  <1> 	stc				; FORCE NMI BIT ON IN CARRY FLAG
   505 00006CAF D0D8                <1> 	rcr	al, 1			; HIGH BIT ON TO DISABLE NMI - OLD IN CY
   506 00006CB1 FA                  <1> 	cli				; DISABLE INTERRUPTS
   507 00006CB2 E670                <1> 	out	CMOS_PORT, al		; ADDRESS LOCATION AND DISABLE NMI
   508                              <1> 	; 29/05/2016
   509                              <1> 	;nop				; I/O DELAY
   510 00006CB4 E6EB                <1> 	out	0ebh,al	; NEWIODELAY ; AWARD BIOS 1999, ATIME.ASM
   511                              <1> 	;
   512 00006CB6 E471                <1> 	in	al, CMOS_DATA		; READ THE REQUESTED CMOS LOCATION
   513 00006CB8 6650                <1> 	push	ax			; SAVE (AH) REGISTER VALUE AND CMOS BYTE
   514                              <1> 	; 15/03/2015 ; IBM PC/XT Model 286 BIOS source code 
   515                              <1> 		     ; ----- 10/06/85 (test4.asm)
   516 00006CBA B01E                <1> 	mov	al, CMOS_SHUT_DOWN*2 	; GET ADDRESS OF DEFAULT LOCATION
   517                              <1> 	;mov	al, CMOS_REG_D*2 	; GET ADDRESS OF DEFAULT LOCATION
   518 00006CBC D0D8                <1> 	rcr	al, 1			; PUT ORIGINAL NMI MASK BIT INTO ADDRESS
   519 00006CBE E670                <1> 	out	CMOS_PORT, al		; SET DEFAULT TO READ ONLY REGISTER
   520 00006CC0 6658                <1> 	pop	ax			; RESTORE (AH) AND (AL), CMOS BYTE
   521 00006CC2 9D                  <1> 	popf	
   522 00006CC3 C3                  <1> 	retn				; RETURN WITH FLAGS RESTORED
   523                              <1> 
   524                              <1> ; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
   525                              <1> 
   526                              <1> ;--- CMOS_WRITE ----------------------------------------------------------------
   527                              <1> ;	WRITE BYTE TO CMOS SYSTEM CLOCK CONFIGURATION TABLE		       :
   528                              <1> ;									       :
   529                              <1> ; INPUT: (AL)=	CMOS TABLE ADDRESS TO BE WRITTEN TO			       :
   530                              <1> ;		BIT    7 = 0 FOR NMI ENABLED AND 1 FOR NMI DISABLED ON EXIT    :
   531                              <1> ;		BITS 6-0 = ADDRESS OF TABLE LOCATION TO WRITE		       :
   532                              <1> ;	 (AH)=	NEW VALUE TO BE PLACED IN THE ADDRESSED TABLE LOCATION	       :
   533                              <1> ;									       :
   534                              <1> ; OUTPUT:	VALUE IN (AH) PLACED IN LOCATION (AL) WITH NMI LEFT DISABLED   :
   535                              <1> ;		IF BIT 7 OF (AL) IS ON, DURING THE CMOS UPDATE BOTH NMI AND    :
   536                              <1> ;		NORMAL INTERRUPTS ARE DISABLED TO PROTECT CMOS DATA INTEGRITY. :
   537                              <1> ;		THE CMOS ADDRESS REGISTER IS POINTED TO A DEFAULT VALUE AND    :
   538                              <1> ;		THE INTERRUPT FLAG RESTORED TO THE ENTRY STATE ON RETURN.      :
   539                              <1> ;		ONLY THE CMOS LOCATION AND THE NMI STATE IS CHANGED.	       :
   540                              <1> ;-------------------------------------------------------------------------------
   541                              <1> 
   542                              <1> CMOS_WRITE:				; WRITE (AH) TO LOCATION (AL)
   543 00006CC4 9C                  <1> 	pushf				; SAVE INTERRUPT ENABLE STATUS AND FLAGS
   544 00006CC5 6650                <1> 	push	ax			; SAVE WORK REGISTER VALUES
   545 00006CC7 D0C0                <1> 	rol	al, 1			; MOVE NMI BIT TO LOW POSITION
   546 00006CC9 F9                  <1> 	stc				; FORCE NMI BIT ON IN CARRY FLAG
   547 00006CCA D0D8                <1> 	rcr	al, 1			; HIGH BIT ON TO DISABLE NMI - OLD IN CY
   548 00006CCC FA                  <1> 	cli				; DISABLE INTERRUPTS
   549 00006CCD E670                <1> 	out	CMOS_PORT, al		; ADDRESS LOCATION AND DISABLE NMI
   550 00006CCF 88E0                <1> 	mov	al, ah			; GET THE DATA BYTE TO WRITE
   551 00006CD1 E671                <1> 	out	CMOS_DATA, al		; PLACE IN REQUESTED CMOS LOCATION
   552 00006CD3 B01E                <1> 	mov	al, CMOS_SHUT_DOWN*2	; GET ADDRESS OF DEFAULT LOCATION
   553                              <1> 	;mov	al, CMOS_REG_D*2 	; GET ADDRESS OF DEFAULT LOCATION
   554 00006CD5 D0D8                <1> 	rcr	al, 1			; PUT ORIGINAL NMI MASK BIT INTO ADDRESS
   555 00006CD7 E670                <1> 	out	CMOS_PORT, al		; SET DEFAULT TO READ ONLY REGISTER
   556 00006CD9 90                  <1> 	nop				; I/O DELAY
   557 00006CDA E471                <1> 	in	al, CMOS_DATA		; OPEN STANDBY LATCH
   558 00006CDC 6658                <1> 	pop	ax			; RESTORE WORK REGISTERS
   559 00006CDE 9D                  <1> 	popf
   560 00006CDF C3                  <1> 	retn
   561                              <1> 
   562                              <1> ; /// End Of TIMER FUNCTIONS ///
  2889                                  
  2890                                  Align 16
  2891                                  
  2892                                  gdt:	; Global Descriptor Table
  2893                                  	; 02/12/2020
  2894                                  	; (30/07/2015, conforming cs)
  2895                                  	; (26/03/2015)
  2896                                  	; (24/03/2015, tss)
  2897                                  	; (19/03/2015)
  2898                                  	; (29/12/2013)
  2899                                  	;
  2900 00006CE0 0000000000000000        	dw 0, 0, 0, 0		; NULL descriptor
  2901                                  gdt_kcode:
  2902                                  	; 18/08/2014
  2903                                  			; 8h kernel code segment, base = 00000000h		
  2904                                  	;dw 0FFFFh, 0, 9E00h, 00CFh	; KCODE  ; 30/12/2016	 
  2905 00006CE8 FFFF0000009ACF00        	dw 0FFFFh, 0, 9A00h, 00CFh	; KCODE
  2906                                  gdt_kdata:
  2907                                  			; 10h kernel data segment, base = 00000000h	
  2908 00006CF0 FFFF00000092CF00        	dw 0FFFFh, 0, 9200h, 00CFh	; KDATA
  2909                                  gdt_ucode:
  2910                                  			; 1Bh user code segment, base address = 400000h ; CORE
  2911                                  	;dw 0FBFFh, 0, 0FE40h, 00CFh	; UCODE  ; 30/12/2016	
  2912 00006CF8 FFFB000040FACF00        	dw 0FBFFh, 0, 0FA40h, 00CFh	; UCODE
  2913                                  gdt_udata: 
  2914                                  			; 23h user data segment, base address = 400000h ; CORE
  2915 00006D00 FFFB000040F2CF00        	dw 0FBFFh, 0, 0F240h, 00CFh	; UDATA
  2916                                  gdt_tss:
  2917                                  			; Task State Segment
  2918 00006D08 6700                    	dw 0067h ; Limit = 103 ; (104-1, tss size = 104 byte, 
  2919                                  			       ;  no IO permission in ring 3)
  2920                                  gdt_tss0:
  2921 00006D0A 0000                    	dw 0  ; TSS base address, bits 0-15 
  2922                                  gdt_tss1:
  2923 00006D0C 00                      	db 0  ; TSS base address, bits 16-23 
  2924                                  	      		; 49h	
  2925 00006D0D E9                      	db 11101001b ; 0E9h => P=1/DPL=11/0/1/0/B/1 --> B = Task is busy (1)
  2926 00006D0E 00                      	db 0 ; G/0/0/AVL/LIMIT=0000 ; (Limit bits 16-19 = 0000) (G=0, 1 byte)
  2927                                  gdt_tss2:
  2928 00006D0F 00                      	db 0  ; TSS base address, bits 24-31 
  2929                                  
  2930                                  	; 30/11/2020
  2931                                  	; 29/11/2020 - TRDOS v2.0.3
  2932                                  	; VESA VBE3 VIDE BIOS 32 BIT PMI SEGMENTS (16 bit segments)
  2933                                  			; 30h ; VBE3CS
  2934                                  _vbe3_CS:  ; vesa vbe3 bios uses this as code seg (same addr with _vbe3_DS)
  2935                                  	; limit = 65536, base addr = 0, P/DPL/1/Type/C/R/A = 9Ah, 16 bit
  2936 00006D10 FFFF0000009A0000        	dw 0FFFFh, 0, 9A00h, 0 ; Note: base addr will be initialized
  2937                                  			; 38h ; VBE3BDS
  2938                                  _vbe3_BDS: ; vesa vbe3 bios uses this as equivalent of rombios data segment
  2939                                  	; limit = 1536, base addr = 0, P/DPL/1/Type/E/W/A = 92h, 16 bit
  2940 00006D18 FF05000000920000        	dw 05FFh, 0, 9200h, 0 ; Note: base addr will be initialized	
  2941                                  			; 40h ; VBE3A000 
  2942                                  _A0000Sel: ; VGA default video memory address
  2943                                  	; limit = 65536, base addr = 0A0000h, 16 bit
  2944 00006D20 FFFF00000A920000        	dw 0FFFFh, 0, 920Ah, 0
  2945                                  			; 48h ; VBE3B000 
  2946                                  _B0000Sel: ; MDA (monochrome) video memory address
  2947                                  	; limit = 65536, base addr = 0B0000h, 16 bit
  2948 00006D28 FFFF00000B920000        	dw 0FFFFh, 0, 920Bh, 0
  2949                                  			; 50h ; VBE3B800 
  2950                                  _B8000Sel: ; CGA video memory address
  2951                                  	; limit = 32768, base addr = 0B8000h, 16 bit
  2952 00006D30 FF7F00800B920000        	dw 07FFFh, 8000h, 920Bh, 0
  2953                                  			; 58h ; VBE3DS 
  2954                                  _vbe3_DS: ; vesa vbe3 bios uses this as data seg (CodeSegSel in PMInfoBlock)
  2955                                  	; limit = 65536, base addr = 0, P/DPL/1/Type/E/W/A = 92h, 16 bit
  2956 00006D38 FFFF000000920000        	dw 0FFFFh, 0, 9200h, 0 ; Note: base addr will be initialized
  2957                                  			; 60h ; VBE3SS   
  2958                                  _vbe3_SS: ; kernel's stack segment but 16 bit version (same stack addr)
  2959                                  	; limit = 1024, base addr = 0, P/DPL/1/Type/E/W/A = 92h, 16 bit
  2960 00006D40 FF03000000920000        	dw 03FFh, 0, 9200h, 0 ; Note: base addr will be initialized
  2961                                  			; 68h ; VBE3ES 	
  2962                                  _vbe3_ES: ; extra 16 bit segment points to buffers in kernel's mem space
  2963                                  	; limit = 2048, base addr = 0, P/DPL/1/Type/E/W/A = 92h, 16 bit
  2964 00006D48 FF07000000920000        	dw 07FFh, 0, 9200h,0 ; Note: base addr will be initialized
  2965                                  			; 70h ; KODE16	
  2966                                  _16bit_CS: ; 16 bit code segment points to kernel's far return addr
  2967                                  	; limit = 16M, base addr = 0, P/DPL/1/Type/E/W/A = 92h, 16 bit
  2968 00006D50 FFFF0000009AFF00        	dw 0FFFFh, 0, 9A00h, 00FFh ; Note: base addr will be initialized
  2969                                  
  2970                                  gdt_end:
  2971                                  	;; 9Eh = 1001 1110b (GDT byte 5) P=1/DPL=00/1/TYPE=1110, 
  2972                                  					;; Type= 1 (code)/C=1/R=1/A=0
  2973                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2974                                  		; 1= Code C= Conforming, R= Readable, A = Accessed
  2975                                  
  2976                                  	;; 9Ah = 1001 1010b (GDT byte 5) P=1/DPL=00/1/TYPE=1010, 
  2977                                  					;; Type= 1 (code)/C=0/R=1/A=0
  2978                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2979                                  		; 1= Code C= non-Conforming, R= Readable, A = Accessed
  2980                                  
  2981                                  	;; 92h = 1001 0010b (GDT byte 5) P=1/DPL=00/1/TYPE=1010, 
  2982                                  					;; Type= 0 (data)/E=0/W=1/A=0
  2983                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2984                                  		; 0= Data E= Expansion direction (1= down, 0= up)
  2985                                  		; W= Writeable, A= Accessed
  2986                                  
  2987                                  	;; FEh = 1111 1110b (GDT byte 5) P=1/DPL=11/1/TYPE=1110, 
  2988                                  					;; Type= 1 (code)/C=1/R=1/A=0
  2989                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  2990                                  		; 1= Code C= Conforming, R= Readable, A = Accessed
  2991                                  	
  2992                                  	;; FAh = 1111 1010b (GDT byte 5) P=1/DPL=11/1/TYPE=1010, 
  2993                                  					;; Type= 1 (code)/C=0/R=1/A=0
  2994                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  2995                                  		; 1= Code C= non-Conforming, R= Readable, A = Accessed
  2996                                  
  2997                                  	;; F2h = 1111 0010b (GDT byte 5) P=1/DPL=11/1/TYPE=0010, 
  2998                                  					;; Type= 0 (data)/E=0/W=1/A=0
  2999                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  3000                                  		; 0= Data E= Expansion direction (1= down, 0= up)
  3001                                  	
  3002                                  	;; CFh = 1100 1111b (GDT byte 6) G=1/B=1/0/AVL=0, Limit=1111b (3)
  3003                                  
  3004                                  		;; Limit = FFFFFh (=> FFFFFh+1= 100000h) // bits 0-15, 48-51 //
  3005                                  		;	 = 100000h * 1000h (G=1) = 4GB
  3006                                  		;; Limit = FFBFFh (=> FFBFFh+1= FFC00h) // bits 0-15, 48-51 //
  3007                                  		;	 = FFC00h * 1000h (G=1) = 4GB - 4MB
  3008                                  		; G= Granularity (1= 4KB), B= Big (32 bit), 
  3009                                  		; AVL= Available to programmers	
  3010                                  
  3011                                  gdtd:
  3012 00006D58 7700                            dw gdt_end - gdt - 1    ; Limit (size)
  3013 00006D5A [E06C0000]                      dd gdt			; Address of the GDT
  3014                                  
  3015                                  	; 20/08/2014
  3016                                  idtd:
  3017 00006D5E 7F02                            dw idt_end - idt - 1    ; Limit (size)
  3018 00006D60 [A87E0100]                      dd idt			; Address of the IDT
  3019                                  
  3020                                  ; 20/02/2017
  3021                                  ;;; 11/03/2015
  3022                                  %include 'diskdata.s'	; DISK (BIOS) DATA (initialized)
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - diskdata.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 24/01/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; diskdata.inc (11/03/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - DISKDATA.INC
    20                              <1> ; Last Modification: 11/03/2015
    21                              <1> ;	(Initialized Disk Parameters Data section for 'DISKIO.INC') 
    22                              <1> ;
    23                              <1> 
    24                              <1> ;----------------------------------------
    25                              <1> ;	80286 INTERRUPT LOCATIONS	:
    26                              <1> ;	REFERENCED BY POST & BIOS	:
    27                              <1> ;----------------------------------------
    28                              <1> 
    29 00006D64 [C76D0000]          <1> DISK_POINTER:	dd	MD_TBL6		; Pointer to Diskette Parameter Table
    30                              <1> 
    31                              <1> ; IBM PC-XT Model 286 source code ORGS.ASM (06/10/85) - 14/12/2014
    32                              <1> ;----------------------------------------------------------------
    33                              <1> ; DISK_BASE							:
    34                              <1> ;	THIS IS THE SET OF PARAMETERS REQUIRED FOR		:
    35                              <1> ;	DISKETTE OPERATION. THEY ARE POINTED AT BY THE		:
    36                              <1> ;	DATA VARIABLE @DISK_POINTER. TO MODIFY THE PARAMETERS,	:
    37                              <1> ;	BUILD ANOTHER PARAMETER BLOCK AND POINT AT IT		:
    38                              <1> ;----------------------------------------------------------------
    39                              <1> 
    40                              <1> ;DISK_BASE:	
    41                              <1> ;	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
    42                              <1> ;	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
    43                              <1> ;	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
    44                              <1> ;	DB	2		; 512 BYTES/SECTOR
    45                              <1> ;	;DB	15		; EOT (LAST SECTOR ON TRACK)
    46                              <1> ;	db	18		; (EOT for 1.44MB diskette)
    47                              <1> ;	DB	01BH		; GAP LENGTH
    48                              <1> ;	DB	0FFH		; DTL
    49                              <1> ;	;DB	054H		; GAP LENGTH FOR FORMAT
    50                              <1> ;	db	06ch		; (for 1.44MB dsikette)
    51                              <1> ;	DB	0F6H		; FILL BYTE FOR FORMAT
    52                              <1> ;	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
    53                              <1> ;	DB	8		; MOTOR START TIME (1/8 SECONDS)
    54                              <1> 
    55                              <1> ;----------------------------------------
    56                              <1> ;	ROM BIOS DATA AREAS		:
    57                              <1> ;----------------------------------------
    58                              <1> 
    59                              <1> ;DATA		SEGMENT AT 40H		; ADDRESS= 0040:0000
    60                              <1> 
    61                              <1> ;@EQUIP_FLAG	DW	?		; INSTALLED HARDWARE FLAGS
    62                              <1> 
    63                              <1> ;----------------------------------------
    64                              <1> ;	DISKETTE DATA AREAS		:
    65                              <1> ;----------------------------------------
    66                              <1> 
    67                              <1> ;@SEEK_STATUS	DB	?		; DRIVE RECALIBRATION STATUS
    68                              <1> ;					; BIT 3-0 = DRIVE 3-0 RECALIBRATION
    69                              <1> ;					; BEFORE NEXT SEEK IF BIT IS = 0
    70                              <1> ;@MOTOR_STATUS	DB	?		; MOTOR STATUS
    71                              <1> ;					; BIT 3-0 = DRIVE 3-0 CURRENTLY RUNNING
    72                              <1> ;					; BIT 7 = CURRENT OPERATION IS A WRITE
    73                              <1> ;@MOTOR_COUNT	DB	?		; TIME OUT COUNTER FOR MOTOR(S) TURN OFF
    74                              <1> ;@DSKETTE_STATUS DB	?		; RETURN CODE STATUS BYTE
    75                              <1> ;					; CMD_BLOCK  IN STACK FOR DISK OPERATION
    76                              <1> ;@NEC_STATUS	DB	7 DUP(?)	; STATUS BYTES FROM DISKETTE OPERATION
    77                              <1> 
    78                              <1> ;----------------------------------------
    79                              <1> ;	POST AND BIOS WORK DATA AREA	:
    80                              <1> ;----------------------------------------
    81                              <1> 
    82                              <1> ;@INTR_FLAG	DB	?		; FLAG INDICATING AN INTERRUPT HAPPENED
    83                              <1> 
    84                              <1> ;----------------------------------------
    85                              <1> ;	TIMER DATA AREA 		:
    86                              <1> ;----------------------------------------
    87                              <1> 
    88                              <1> ; 17/12/2014  (IRQ 0 - INT 08H)
    89                              <1> ;TIMER_LOW	equ	46Ch		; Timer ticks (counter)  @ 40h:006Ch
    90                              <1> ;TIMER_HIGH	equ	46Eh		; (18.2 timer ticks per second)
    91                              <1> ;TIMER_OFL	equ	470h		; Timer - 24 hours flag  @ 40h:0070h
    92                              <1> 
    93                              <1> ;----------------------------------------
    94                              <1> ;	ADDITIONAL MEDIA DATA		:
    95                              <1> ;----------------------------------------
    96                              <1> 
    97                              <1> ;@LASTRATE	DB	?		; LAST DISKETTE DATA RATE SELECTED
    98                              <1> ;@DSK_STATE	DB	?		; DRIVE 0 MEDIA STATE
    99                              <1> ;		DB	?		; DRIVE 1 MEDIA STATE
   100                              <1> ;		DB	?		; DRIVE 0 OPERATION START STATE
   101                              <1> ;		DB	?		; DRIVE 1 OPERATION START STATE
   102                              <1> ;@DSK_TRK	DB	?		; DRIVE 0 PRESENT CYLINDER
   103                              <1> ;		DB	?		; DRIVE 1 PRESENT CYLINDER
   104                              <1> 
   105                              <1> ;DATA		ENDS			; END OF BIOS DATA SEGMENT
   106                              <1> 
   107                              <1> ;--------------------------------------------------------
   108                              <1> ;	DRIVE TYPE TABLE				:
   109                              <1> ;--------------------------------------------------------
   110                              <1> 		; 16/02/2015 (unix386.s, 32 bit modifications)
   111                              <1> DR_TYPE:
   112 00006D68 01                  <1> 		DB	01		;DRIVE TYPE, MEDIA TABLE
   113                              <1>                 ;DW      MD_TBL1
   114 00006D69 [866D0000]          <1> 		dd	MD_TBL1
   115 00006D6D 82                  <1> 		DB	02+BIT7ON
   116                              <1> 		;DW      MD_TBL2
   117 00006D6E [936D0000]          <1>                 dd      MD_TBL2
   118 00006D72 02                  <1> DR_DEFAULT:	DB	02
   119                              <1>                 ;DW      MD_TBL3
   120 00006D73 [A06D0000]          <1> 		dd      MD_TBL3
   121 00006D77 03                  <1> 		DB	03
   122                              <1>                 ;DW      MD_TBL4
   123 00006D78 [AD6D0000]          <1> 		dd      MD_TBL4
   124 00006D7C 84                  <1> 		DB	04+BIT7ON
   125                              <1>                 ;DW      MD_TBL5
   126 00006D7D [BA6D0000]          <1> 		dd      MD_TBL5
   127 00006D81 04                  <1> 		DB	04
   128                              <1>                 ;DW      MD_TBL6
   129 00006D82 [C76D0000]          <1> 		dd      MD_TBL6
   130                              <1> DR_TYPE_E       equ $                   ; END OF TABLE
   131                              <1> ;DR_CNT		EQU	(DR_TYPE_E-DR_TYPE)/3
   132                              <1> DR_CNT		equ	(DR_TYPE_E-DR_TYPE)/5
   133                              <1> ;--------------------------------------------------------
   134                              <1> ;	MEDIA/DRIVE PARAMETER TABLES			:
   135                              <1> ;--------------------------------------------------------
   136                              <1> ;--------------------------------------------------------
   137                              <1> ;	360 KB MEDIA IN 360 KB DRIVE			:
   138                              <1> ;--------------------------------------------------------
   139                              <1> MD_TBL1:        
   140 00006D86 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   141 00006D87 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   142 00006D88 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   143 00006D89 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   144 00006D8A 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   145 00006D8B 2A                  <1> 	DB	02AH		; GAP LENGTH
   146 00006D8C FF                  <1> 	DB	0FFH		; DTL
   147 00006D8D 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   148 00006D8E F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   149 00006D8F 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   150 00006D90 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   151 00006D91 27                  <1> 	DB	39		; MAX. TRACK NUMBER
   152 00006D92 80                  <1> 	DB	RATE_250	; DATA TRANSFER RATE
   153                              <1> ;--------------------------------------------------------
   154                              <1> ;	360 KB MEDIA IN 1.2 MB DRIVE			:
   155                              <1> ;--------------------------------------------------------
   156                              <1> MD_TBL2:        
   157 00006D93 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   158 00006D94 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   159 00006D95 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   160 00006D96 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   161 00006D97 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   162 00006D98 2A                  <1> 	DB	02AH		; GAP LENGTH
   163 00006D99 FF                  <1> 	DB	0FFH		; DTL
   164 00006D9A 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   165 00006D9B F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   166 00006D9C 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   167 00006D9D 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   168 00006D9E 27                  <1> 	DB	39		; MAX. TRACK NUMBER
   169 00006D9F 40                  <1> 	DB	RATE_300	; DATA TRANSFER RATE
   170                              <1> ;--------------------------------------------------------
   171                              <1> ;	1.2 MB MEDIA IN 1.2 MB DRIVE			:
   172                              <1> ;--------------------------------------------------------
   173                              <1> MD_TBL3:
   174 00006DA0 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   175 00006DA1 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   176 00006DA2 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   177 00006DA3 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   178 00006DA4 0F                  <1> 	DB	15		; EOT (LAST SECTOR ON TRACK)
   179 00006DA5 1B                  <1> 	DB	01BH		; GAP LENGTH
   180 00006DA6 FF                  <1> 	DB	0FFH		; DTL
   181 00006DA7 54                  <1> 	DB	054H		; GAP LENGTH FOR FORMAT
   182 00006DA8 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   183 00006DA9 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   184 00006DAA 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   185 00006DAB 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   186 00006DAC 00                  <1> 	DB	RATE_500	; DATA TRANSFER RATE
   187                              <1> ;--------------------------------------------------------
   188                              <1> ;	720 KB MEDIA IN 720 KB DRIVE			:
   189                              <1> ;--------------------------------------------------------
   190                              <1> MD_TBL4:
   191 00006DAD DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   192 00006DAE 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   193 00006DAF 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   194 00006DB0 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   195 00006DB1 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   196 00006DB2 2A                  <1> 	DB	02AH		; GAP LENGTH
   197 00006DB3 FF                  <1> 	DB	0FFH		; DTL
   198 00006DB4 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   199 00006DB5 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   200 00006DB6 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   201 00006DB7 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   202 00006DB8 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   203 00006DB9 80                  <1> 	DB	RATE_250	; DATA TRANSFER RATE
   204                              <1> ;--------------------------------------------------------
   205                              <1> ;	720 KB MEDIA IN 1.44 MB DRIVE			:
   206                              <1> ;--------------------------------------------------------
   207                              <1> MD_TBL5:
   208 00006DBA DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   209 00006DBB 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   210 00006DBC 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   211 00006DBD 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   212 00006DBE 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   213 00006DBF 2A                  <1> 	DB	02AH		; GAP LENGTH
   214 00006DC0 FF                  <1> 	DB	0FFH		; DTL
   215 00006DC1 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   216 00006DC2 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   217 00006DC3 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   218 00006DC4 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   219 00006DC5 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   220 00006DC6 80                  <1> 	DB	RATE_250	; DATA TRANSFER RATE
   221                              <1> ;--------------------------------------------------------
   222                              <1> ;	1.44 MB MEDIA IN 1.44 MB DRIVE			:
   223                              <1> ;--------------------------------------------------------
   224                              <1> MD_TBL6:
   225 00006DC7 AF                  <1> 	DB	10101111B	; SRT=A, HD UNLOAD=0F - 1ST SPECIFY BYTE
   226 00006DC8 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   227 00006DC9 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   228 00006DCA 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   229 00006DCB 12                  <1> 	DB	18		; EOT (LAST SECTOR ON TRACK)
   230 00006DCC 1B                  <1> 	DB	01BH		; GAP LENGTH
   231 00006DCD FF                  <1> 	DB	0FFH		; DTL
   232 00006DCE 6C                  <1> 	DB	06CH		; GAP LENGTH FOR FORMAT
   233 00006DCF F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   234 00006DD0 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   235 00006DD1 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   236 00006DD2 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   237 00006DD3 00                  <1> 	DB	RATE_500	; DATA TRANSFER RATE
   238                              <1> 
   239                              <1> 
   240                              <1> ; << diskette.inc >>
   241                              <1> ; +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
   242                              <1> ;
   243                              <1> ;----------------------------------------
   244                              <1> ;	ROM BIOS DATA AREAS		:
   245                              <1> ;----------------------------------------
   246                              <1> 
   247                              <1> ;DATA		SEGMENT AT 40H		; ADDRESS= 0040:0000
   248                              <1> 
   249                              <1> ;----------------------------------------
   250                              <1> ;	FIXED DISK DATA AREAS		:
   251                              <1> ;----------------------------------------
   252                              <1> 
   253                              <1> ;DISK_STATUS1:	DB	0		; FIXED DISK STATUS
   254                              <1> ;HF_NUM:		DB	0		; COUNT OF FIXED DISK DRIVES
   255                              <1> ;CONTROL_BYTE:	DB	0		; HEAD CONTROL BYTE
   256                              <1> ;@PORT_OFF	DB	?		;  RESERVED (PORT OFFSET)
   257                              <1> 
   258                              <1> ;----------------------------------------
   259                              <1> ;	ADDITIONAL MEDIA DATA		:
   260                              <1> ;----------------------------------------
   261                              <1> 
   262                              <1> ;@LASTRATE	DB	?		; LAST DISKETTE DATA RATE SELECTED
   263                              <1> ;HF_STATUS	DB	0		; STATUS REGISTER
   264                              <1> ;HF_ERROR	DB	0		; ERROR REGISTER
   265                              <1> ;HF_INT_FLAG	DB	0		; FIXED DISK INTERRUPT FLAG
   266                              <1> ;HF_CNTRL	DB	0		; COMBO FIXED DISK/DISKETTE CARD BIT 0=1
   267                              <1> ;@DSK_STATE	DB	?		; DRIVE 0 MEDIA STATE
   268                              <1> ;		DB	?		; DRIVE 1 MEDIA STATE
   269                              <1> ;		DB	?		; DRIVE 0 OPERATION START STATE
   270                              <1> ;		DB	?		; DRIVE 1 OPERATION START STATE
   271                              <1> ;@DSK_TRK	DB	?		; DRIVE 0 PRESENT CYLINDER
   272                              <1> ;		DB	?		; DRIVE 1 PRESENT CYLINDER
   273                              <1> 
   274                              <1> ;DATA		ENDS			; END OF BIOS DATA SEGMENT
   275                              <1> ;
   276                              <1> ; +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
   277                              <1> 
   278                              <1> ERR_TBL:
   279 00006DD4 E0                  <1> 	db	NO_ERR
   280 00006DD5 024001BB            <1> 	db	BAD_ADDR_MARK,BAD_SEEK,BAD_CMD,UNDEF_ERR
   281 00006DD9 04BB100A            <1> 	db	RECORD_NOT_FND,UNDEF_ERR,BAD_ECC,BAD_SECTOR
   282                              <1> 
   283                              <1> ; 17/12/2014 (mov ax, [cfd])
   284                              <1> ; 11/12/2014
   285 00006DDD 00                  <1> cfd:		db 0			; current floppy drive (for GET_PARM)
   286                              <1> ; 17/12/2014				; instead of 'DISK_POINTER'
   287 00006DDE 01                  <1> pfd:		db 1			; previous floppy drive (for GET_PARM)
   288                              <1> 					; (initial value of 'pfd 
   289                              <1> 					; must be different then 'cfd' value
   290                              <1> 					; to force updating/initializing
   291                              <1> 					; current drive parameters) 
   292 00006DDF 90                  <1> align 2
   293                              <1> 
   294 00006DE0 F001                <1> HF_PORT:	dw 	1F0h  ; Default = 1F0h
   295                              <1> 			      ; (170h)
   296 00006DE2 F603                <1> HF_REG_PORT:	dw	3F6h  ; HF_PORT + 206h
   297                              <1> 
   298                              <1> ; 05/01/2015 
   299 00006DE4 00                  <1> hf_m_s:         db      0     ; (0 = Master, 1 = Slave)
   300                              <1> 
   301                              <1> ; *****************************************************************************
  3023                                  
  3024 00006DE5 90                      Align 2
  3025                                  
  3026                                  ; 04/11/2014 (Retro UNIX 386 v1)
  3027 00006DE6 0000                    mem_1m_1k:   dw 0  ; Number of contiguous KB between
  3028                                                       ; 1 and 16 MB, max. 3C00h = 15 MB.
  3029 00006DE8 0000                    mem_16m_64k: dw 0  ; Number of contiguous 64 KB blocks
  3030                                  		   ; between 16 MB and 4 GB.
  3031                                  
  3032                                  ; 12/11/2014 (Retro UNIX 386 v1)
  3033 00006DEA 00                      boot_drv:    db 0 ; boot drive number (physical)
  3034                                  ; 24/11/2014
  3035 00006DEB 00                      drv:	     db 0 
  3036 00006DEC 00                      last_drv:    db 0 ; last hdd
  3037 00006DED 00                      hdc:         db 0  ; number of hard disk drives
  3038                                  		     ; (present/detected)
  3039                                  
  3040                                  ; 24/11/2014 (Retro UNIX 386 v1)
  3041                                  ; Physical drive type & flags
  3042 00006DEE 00                      fd0_type:    db 0  ; floppy drive type
  3043 00006DEF 00                      fd1_type:    db 0  ; 4 = 1.44 Mb, 80 track, 3.5" (18 spt)
  3044                                  		     ; 6 = 2.88 Mb, 80 track, 3.5" (36 spt)
  3045                                  		     ; 3 = 720 Kb, 80 track, 3.5" (9 spt)
  3046                                  		     ; 2 = 1.2 Mb, 80 track, 5.25" (15 spt)
  3047                                  		     ; 1 = 360 Kb, 40 track, 5.25" (9 spt)		
  3048 00006DF0 00                      hd0_type:    db 0  ; EDD status for hd0 (bit 7 = present flag)
  3049 00006DF1 00                      hd1_type:    db 0  ; EDD status for hd1 (bit 7 = present flag)
  3050 00006DF2 00                      hd2_type:    db 0  ; EDD status for hd2 (bit 7 = present flag)
  3051 00006DF3 00                      hd3_type:    db 0  ; EDD status for hd3 (bit 7 = present flag)
  3052                                  		     ; bit 0 - Fixed disk access subset supported
  3053                                  		     ; bit 1 - Drive locking and ejecting
  3054                                  		     ; bit 2 - Enhanced disk drive support
  3055                                  		     ; bit 3 = Reserved (64 bit EDD support)
  3056                                  		     ; (If bit 0 is '1' Retro UNIX 386 v1
  3057                                  		     ; will interpret it as 'LBA ready'!)
  3058                                  
  3059                                  ; 11/03/2015 - 10/07/2015
  3060 00006DF4 000000000000000000-     drv.cylinders: dw 0,0,0,0,0,0,0
  3060 00006DFD 0000000000         
  3061 00006E02 000000000000000000-     drv.heads:     dw 0,0,0,0,0,0,0
  3061 00006E0B 0000000000         
  3062 00006E10 000000000000000000-     drv.spt:       dw 0,0,0,0,0,0,0
  3062 00006E19 0000000000         
  3063 00006E1E 000000000000000000-     drv.size:      dd 0,0,0,0,0,0,0
  3063 00006E27 000000000000000000-
  3063 00006E30 000000000000000000-
  3063 00006E39 00                 
  3064 00006E3A 00000000000000          drv.status:    db 0,0,0,0,0,0,0
  3065 00006E41 00000000000000          drv.error:     db 0,0,0,0,0,0,0	
  3066                                  
  3067                                  Align 2
  3068                                  
  3069                                  ;;; 11/03/2015
  3070                                  %include 'kybdata.s'	; KEYBOARD (BIOS) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - kybdata.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 17/01/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 17/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; kybdata.inc (11/03/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - KYBDATA.INC
    20                              <1> ; Last Modification: 11/03/2015
    21                              <1> ;		 (Data Section for 'KEYBOARD.INC')	
    22                              <1> ;
    23                              <1> ; ///////// KEYBOARD DATA ///////////////
    24                              <1> 
    25                              <1> ; 05/12/2014
    26                              <1> ; 04/12/2014 (derived from pc-xt-286 bios source code -1986-) 
    27                              <1> ; 03/06/86  KEYBOARD BIOS
    28                              <1> 
    29                              <1> ;---------------------------------------------------------------------------------
    30                              <1> ;	KEY IDENTIFICATION SCAN TABLES
    31                              <1> ;---------------------------------------------------------------------------------
    32                              <1> 
    33                              <1> ;-----	TABLES FOR ALT CASE ------------
    34                              <1> ;-----	ALT-INPUT-TABLE 
    35 00006E48 524F50514B          <1> K30:	db	82,79,80,81,75
    36 00006E4D 4C4D474849          <1> 	db	76,77,71,72,73		; 10 NUMBER ON KEYPAD
    37                              <1> ;-----	SUPER-SHIFT-TABLE 
    38 00006E52 101112131415        <1> 	db	16,17,18,19,20,21	; A-Z TYPEWRITER CHARS
    39 00006E58 161718191E1F        <1> 	db	22,23,24,25,30,31
    40 00006E5E 202122232425        <1> 	db	32,33,34,35,36,37
    41 00006E64 262C2D2E2F30        <1> 	db	38,44,45,46,47,48
    42 00006E6A 3132                <1> 	db	49,50
    43                              <1> 
    44                              <1> ;-----	TABLE OF SHIFT KEYS AND MASK VALUES
    45                              <1> ;-----	KEY_TABLE 
    46 00006E6C 52                  <1> _K6:    db      INS_KEY                 ; INSERT KEY
    47 00006E6D 3A4546381D          <1> 	db	CAPS_KEY,NUM_KEY,SCROLL_KEY,ALT_KEY,CTL_KEY
    48 00006E72 2A36                <1>         db      LEFT_KEY,RIGHT_KEY
    49                              <1> _K6L    equ     $-_K6
    50                              <1> 
    51                              <1> ;-----	MASK_TABLE
    52 00006E74 80                  <1> _K7:    db      INS_SHIFT               ; INSERT MODE SHIFT
    53 00006E75 4020100804          <1> 	db	CAPS_SHIFT,NUM_SHIFT,SCROLL_SHIFT,ALT_SHIFT,CTL_SHIFT
    54 00006E7A 0201                <1> 	db	LEFT_SHIFT,RIGHT_SHIFT
    55                              <1> 
    56                              <1> ;-----	TABLES FOR CTRL CASE		;---- CHARACTERS ------
    57 00006E7C 1BFF00FFFFFF        <1> _K8:	db	27,-1,0,-1,-1,-1	; Esc, 1, 2, 3, 4, 5
    58 00006E82 1EFFFFFFFF1F        <1> 	db 	30,-1,-1,-1,-1,31	; 6, 7, 8, 9, 0, -
    59 00006E88 FF7FFF111705        <1> 	db	-1,127,-1,17,23,5	; =, Bksp, Tab, Q, W, E
    60 00006E8E 12141915090F        <1> 	db	18,20,25,21,9,15	; R, T, Y, U, I, O
    61 00006E94 101B1D0AFF01        <1> 	db	16,27,29,10,-1,1	; P, [, ], Enter, Ctrl, A
    62 00006E9A 13040607080A        <1> 	db	19,4,6,7,8,10		; S, D, F, G, H, J
    63 00006EA0 0B0CFFFFFFFF        <1> 	db	11,12,-1,-1,-1,-1	; K, L, :, ', `, LShift
    64 00006EA6 1C1A18031602        <1> 	db	28,26,24,3,22,2		; Bkslash, Z, X, C, V, B
    65 00006EAC 0E0DFFFFFFFF        <1> 	db	14,13,-1,-1,-1,-1	; N, M, ,, ., /, RShift
    66 00006EB2 96FF20FF            <1> 	db	150,-1,' ',-1		; *, ALT, Spc, CL
    67                              <1> 	;				;----- FUNCTIONS ------		
    68 00006EB6 5E5F60616263        <1> 	db 	94,95,96,97,98,99	; F1 - F6
    69 00006EBC 64656667FFFF        <1> 	db	100,101,102,103,-1,-1	; F7 - F10, NL, SL
    70 00006EC2 778D848E738F        <1> 	db	119,141,132,142,115,143	; Home, Up, PgUp, -, Left, Pad5
    71 00006EC8 749075917692        <1> 	db 	116,144,117,145,118,146 ; Right, +, End, Down, PgDn, Ins
    72 00006ECE 93FFFFFF898A        <1> 	db	147,-1,-1,-1,137,138	; Del, SysReq, Undef, WT, F11, F12
    73                              <1> 
    74                              <1> ;-----	TABLES FOR LOWER CASE ----------
    75 00006ED4 1B3132333435363738- <1> K10:	db 	27,'1234567890-=',8,9
    75 00006EDD 39302D3D0809        <1>
    76 00006EE3 71776572747975696F- <1> 	db 	'qwertyuiop[]',13,-1,'asdfghjkl;',39
    76 00006EEC 705B5D0DFF61736466- <1>
    76 00006EF5 67686A6B6C3B27      <1>
    77 00006EFC 60FF5C7A786376626E- <1> 	db	96,-1,92,'zxcvbnm,./',-1,'*',-1,' ',-1
    77 00006F05 6D2C2E2FFF2AFF20FF  <1>
    78                              <1> ;-----	LC TABLE SCAN
    79 00006F0E 3B3C3D3E3F          <1> 	db	59,60,61,62,63		; BASE STATE OF F1 - F10
    80 00006F13 4041424344          <1> 	db	64,65,66,67,68
    81 00006F18 FFFF                <1> 	db	-1,-1			; NL, SL
    82                              <1> 
    83                              <1> ;-----	KEYPAD TABLE
    84 00006F1A 474849FF4BFF        <1> K15:	db	71,72,73,-1,75,-1	; BASE STATE OF KEYPAD KEYS
    85 00006F20 4DFF4F50515253      <1> 	db	77,-1,79,80,81,82,83
    86 00006F27 FFFF5C8586          <1> 	db	-1,-1,92,133,134	; SysRq, Undef, WT, F11, F12
    87                              <1> 
    88                              <1> ;-----	TABLES FOR UPPER CASE ----------
    89 00006F2C 1B21402324255E262A- <1> K11:	db 	27,'!@#$%',94,'&*()_+',8,0
    89 00006F35 28295F2B0800        <1>
    90 00006F3B 51574552545955494F- <1> 	db 	'QWERTYUIOP{}',13,-1,'ASDFGHJKL:"'
    90 00006F44 507B7D0DFF41534446- <1>
    90 00006F4D 47484A4B4C3A22      <1>
    91 00006F54 7EFF7C5A584356424E- <1> 	db	126,-1,'|ZXCVBNM<>?',-1,'*',-1,' ',-1
    91 00006F5D 4D3C3E3FFF2AFF20FF  <1>
    92                              <1> ;-----	UC TABLE SCAN
    93 00006F66 5455565758          <1> K12:	db	84,85,86,87,88		; SHIFTED STATE OF F1 - F10
    94 00006F6B 595A5B5C5D          <1> 	db	89,90,91,92,93
    95 00006F70 FFFF                <1> 	db	-1,-1			; NL, SL
    96                              <1> 
    97                              <1> ;-----	NUM STATE TABLE
    98 00006F72 3738392D3435362B31- <1> K14:	db 	'789-456+1230.'		; NUMLOCK STATE OF KEYPAD KEYS
    98 00006F7B 3233302E            <1>
    99                              <1> 	;
   100 00006F7F FFFF7C8788          <1> 	db	-1,-1,124,135,136	; SysRq, Undef, WT, F11, F12
   101                              <1> 
   102                              <1> ; 26/08/2014
   103                              <1> ; Retro UNIX 8086 v1 - UNIX.ASM (03/03/2014)
   104                              <1> ; Derived from IBM "pc-at" 
   105                              <1> ; rombios source code (06/10/1985)
   106                              <1> ; 'dseg.inc'
   107                              <1> 
   108                              <1> ;---------------------------------------;
   109                              <1> ;	SYSTEM DATA AREA		;
   110                              <1> ;----------------------------------------
   111 00006F84 00                  <1> BIOS_BREAK	db	0		; BIT 7=1 IF BREAK KEY HAS BEEN PRESSED
   112                              <1> 
   113                              <1> ;----------------------------------------
   114                              <1> ;	KEYBOARD DATA AREAS		;
   115                              <1> ;----------------------------------------
   116                              <1> 
   117 00006F85 00                  <1> KB_FLAG		db	0		; KEYBOARD SHIFT STATE AND STATUS FLAGS
   118 00006F86 00                  <1> KB_FLAG_1	db	0		; SECOND BYTE OF KEYBOARD STATUS
   119 00006F87 00                  <1> KB_FLAG_2	db	0		; KEYBOARD LED FLAGS
   120 00006F88 00                  <1> KB_FLAG_3	db	0		; KEYBOARD MODE STATE AND TYPE FLAGS
   121 00006F89 00                  <1> ALT_INPUT	db	0		; STORAGE FOR ALTERNATE KEY PAD ENTRY
   122 00006F8A [9A6F0000]          <1> BUFFER_START	dd	KB_BUFFER 	; OFFSET OF KEYBOARD BUFFER START
   123 00006F8E [BA6F0000]          <1> BUFFER_END	dd	KB_BUFFER + 32	; OFFSET OF END OF BUFFER
   124 00006F92 [9A6F0000]          <1> BUFFER_HEAD	dd	KB_BUFFER 	; POINTER TO HEAD OF KEYBOARD BUFFER
   125 00006F96 [9A6F0000]          <1> BUFFER_TAIL	dd	KB_BUFFER 	; POINTER TO TAIL OF KEYBOARD BUFFER
   126                              <1> ; ------	HEAD = TAIL	INDICATES THAT THE BUFFER IS EMPTY
   127 00006F9A 0000<rept>          <1> KB_BUFFER	times	16 dw 0		; ROOM FOR 16 SCAN CODE ENTRIES
   128                              <1> 
   129                              <1> ; /// End Of KEYBOARD DATA ///
  3071                                  %include 'vidata.s'	; VIDEO (BIOS) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.3 - vidata.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 24/11/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 16/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.15 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; vidata.inc (11/03/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-AT' BIOS source code (1985) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - VIDATA.S
    20                              <1> ; Last Modification: 11/03/2015
    21                              <1> ;		    (Data section for 'VIDEO.INC')	
    22                              <1> ;
    23                              <1> ; ///////// VIDEO DATA ///////////////
    24                              <1> 
    25                              <1> ;----------------------------------------
    26                              <1> ;	VIDEO DISPLAY DATA AREA		;
    27                              <1> ;----------------------------------------
    28 00006FBA 03                  <1> CRT_MODE:	db	3	; CURRENT DISPLAY MODE (TYPE)
    29 00006FBB 29                  <1> CRT_MODE_SET:	db	29h	; CURRENT SETTING OF THE 3X8 REGISTER
    30                              <1> 				; (29h default setting for video mode 3)
    31                              <1> 				; Mode Select register Bits
    32                              <1> 				;   BIT 0 - 80x25 (1), 40x25 (0)
    33                              <1> 				;   BIT 1 - ALPHA (0), 320x200 GRAPHICS (1)
    34                              <1> 				;   BIT 2 - COLOR (0), BW (1)
    35                              <1> 				;   BIT 3 - Video Sig. ENABLE (1), DISABLE (0)
    36                              <1> 				;   BIT 4 - 640x200 B&W Graphics Mode (1)
    37                              <1> 				;   BIT 5 - ALPHA mode BLINKING (1)
    38                              <1> 				;   BIT 6, 7 - Not Used
    39                              <1> 
    40                              <1> ; Mode 0 - 2Ch = 101100b	; 40x25 text, 16 gray colors
    41                              <1> ; Mode 1 - 28h = 101000b	; 40x25 text, 16 fore colors, 8 back colors
    42                              <1> ; Mode 2 - 2Dh = 101101b	; 80x25 text, 16 gray colors	
    43                              <1> ; Mode 3 - 29h = 101001b	; 80x25 text, 16 fore color, 8 back color
    44                              <1> ; Mode 4 - 2Ah = 101010b	; 320x200 graphics, 4 colors
    45                              <1> ; Mode 5 - 2Eh = 101110b	; 320x200 graphics, 4 gray colors
    46                              <1> ; Mode 6 - 1Eh = 011110b	; 640x200 graphics, 2 colors
    47                              <1> ; Mode 7 - 29h = 101001b	; 80x25 text, black & white colors
    48                              <1> ; Mode & 37h = Video signal OFF
    49                              <1> 
    50                              <1> ; 24/06/2016
    51 00006FBC 50                  <1> CRT_COLS:	db	80	; Number of columns
    52                              <1> 
    53                              <1> ; 01/07/2016
    54 00006FBD 00                  <1> CRT_PALETTE:	db 	0	; Current palette setting
    55                              <1> 
    56                              <1> ; 03/07/2016
    57 00006FBE 10                  <1> CHAR_HEIGHT:	db	16	; Default character height
    58 00006FBF 60                  <1> VGA_VIDEO_CTL:	db	60h	; ROM BIOS DATA AREA Offset 87h
    59 00006FC0 F9                  <1> VGA_SWITCHES:	db 	0F9h	; Feature Bit Switches (the basic screen)
    60 00006FC1 51                  <1> VGA_MODESET_CTL: db	051h	; Basic mode set options (VGA video flags)
    61                              <1> 				; ROM BIOS DATA AREA Offset 89h
    62                              <1> 				; Bit 7, 4 : Mode
    63                              <1> 				;	  01 : 400-line mode
    64                              <1> 				; Bit 6	: Display switch enabled = 1			
    65                              <1> 				; Bit 5	: Reserved = 0
    66                              <1> 				; Bit 3	: Default palette loading 
    67                              <1> 				;	  disabled = 0
    68                              <1> 				; Bit 2 : Color monitor = 0
    69                              <1> 				; Bit 1 = Gray scale summing 
    70                              <1> 				;	  disabled = 0
    71                              <1> 				; Bit 0 = VGA active = 1
    72 00006FC2 19                  <1> VGA_ROWS:	db	25
    73                              <1> 
    74                              <1> ; 16/01/2016
    75                              <1> chr_attrib:  ; Character color/attributes for video pages (0 to 7)
    76 00006FC3 0707070707070707    <1> 	db	07h, 07h, 07h, 07h, 07h, 07h, 07h, 07h
    77                              <1> ; 30/01/2016
    78                              <1> vmode:
    79 00006FCB 0303030303030303    <1> 	db	3,3,3,3,3,3,3,3 ; video modes for pseudo screens 
    80                              <1> 
    81                              <1> CURSOR_MODE: ; cursor start (ch) = 14, cursor end (cl) = 15
    82 00006FD3 0F0E                <1> 	db	15, 14 ; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
    83                              <1> 
    84                              <1> ;align 4
    85                              <1> ;VGA_BASE: ; 26/07/2016
    86                              <1> ;	dd	 0B8000h  ; (Mode < 0Dh) or 0A0000h (mode >= 0Dh)
    87                              <1> 
    88 00006FD5 90                  <1> align 2
    89                              <1> 
    90                              <1> vga_modes:
    91                              <1> 	; 25/07/2016
    92                              <1> 	; 09/07/2016
    93                              <1> 	; 03/07/2016
    94                              <1> 	; valid (implemented) video modes (>7, extension to IBM PC CGA modes)
    95 00006FD6 0302010007040506    <1> 	db 	03h, 02h, 01h, 00h, 07h, 04h, 05h, 06h
    96                              <1> vga_g_modes: ; 31/07/2016
    97 00006FDE 13F0126A0D0E1011    <1> 	db	13h, 0F0h, 12h, 6Ah, 0Dh, 0Eh, 10h, 11h
    98                              <1> vga_mode_count equ $ - vga_modes
    99                              <1> vga_g_mode_count equ $ - vga_g_modes
   100                              <1> 
   101                              <1> vga_mode_tbl_ptr:
   102                              <1> 	; 25/07/2016
   103 00006FE6 [46700000]          <1> 	dd	vga_mode_03h
   104 00006FEA [46700000]          <1> 	dd	vga_mode_03h ; mode 02h -> mode 03h 
   105 00006FEE [86700000]          <1> 	dd	vga_mode_01h
   106 00006FF2 [86700000]          <1> 	dd	vga_mode_01h ; mode 00h -> mode 01h
   107                              <1> 	;dd	vga_mode_07h
   108 00006FF6 [46700000]          <1> 	dd	vga_mode_03h ; mode 07h -> mode 03h
   109 00006FFA [C6700000]          <1> 	dd	vga_mode_04h
   110 00006FFE [C6700000]          <1> 	dd	vga_mode_04h ; mode 05h -> mode 04h	
   111 00007002 [06710000]          <1> 	dd	vga_mode_06h
   112 00007006 [46710000]          <1> 	dd	vga_mode_13h
   113 0000700A [86710000]          <1> 	dd	vga_mode_F0h
   114 0000700E [C6710000]          <1> 	dd	vga_mode_12h
   115 00007012 [06720000]          <1> 	dd	vga_mode_6Ah
   116 00007016 [46720000]          <1> 	dd	vga_mode_0Dh
   117 0000701A [86720000]          <1> 	dd	vga_mode_0Eh
   118 0000701E [C6720000]          <1> 	dd	vga_mode_10h
   119 00007022 [06730000]          <1> 	dd	vga_mode_11h	
   120                              <1> 
   121                              <1> vga_memmodel: 
   122                              <1> 	; 25/07/2016
   123                              <1> 	; 07/07/2016
   124                              <1> 	CTEXT	equ 0
   125                              <1> 	;MTEXT	equ 1
   126                              <1> 	MTEXT	equ 0 ; mode 07h -> mode 03h
   127                              <1> 	CGA	equ 2
   128                              <1> 	LINEAR8 equ 5
   129                              <1> 	PLANAR4	equ 4
   130                              <1> 	PLANAR1	equ 3
   131 00007026 0000000000020202    <1> 	db	CTEXT, CTEXT, CTEXT, CTEXT, MTEXT, CGA, CGA, CGA
   132                              <1> vga_g_memmodel: ; 31/07/2016
   133 0000702E 0504040404040403    <1> 	db	LINEAR8, PLANAR4, PLANAR4, PLANAR4, PLANAR4, PLANAR4, PLANAR4, PLANAR1
   134                              <1> ;vga_pixbits:
   135                              <1> ;	; 25/07/2016
   136                              <1> ;	; 08/07/2016
   137                              <1> ;	db 	4, 4, 4, 4, 4, 2, 2, 1, 8, 4, 4, 4, 4, 4, 4, 1
   138                              <1> vga_dac_s:
   139 00007036 020202020001010103- <1> 	db	2, 2, 2, 2, 0, 1, 1, 1, 3, 3, 2, 2, 1, 1, 2, 2  
   139 0000703F 03020201010202      <1>
   140                              <1> 						; (vgatables.h, VGAMODES, dac) 
   141                              <1> 						; 17/11/2020
   142                              <1> vga_params:
   143                              <1> 	; 23/11/2020
   144                              <1> 	; 16/11/2020
   145                              <1> 	; 09/11/2020, 10/11/2020, 11/11/2020 (TRDOS 386 v2.0.3)
   146                              <1> 	; 25/07/2016 
   147                              <1> 	; 19/07/2016
   148                              <1> 	; 03/07/2016
   149                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
   150                              <1> 	; vgabios-0.7a (2011)
   151                              <1> 	; by the LGPL VGABios Developers Team (2001-2008)
   152                              <1> 	; 'vgatables.h'
   153                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
   154                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
   155                              <1> 
   156                              <1> 	; 09/11/2020
   157                              <1> 	; Block Structure of Video Parameter Table
   158                              <1> 	;
   159                              <1> 	; Offset	# Bytes		Contents
   160                              <1> 	;
   161                              <1> 	;  0		1		# columns
   162                              <1> 	;  1		1  		# rows - 1 
   163                              <1> 	;  2		1		Pixels/character
   164                              <1> 	;  3-4		2		Page length		
   165                              <1> 	;  5-8		4		Sequencer Registers
   166                              <1> 	;  9		1		Miscellaneous Register	
   167                              <1> 	;  10-34	25		CRTC Registers
   168                              <1> 	;  35-54	20		Attribute Registers
   169                              <1> 	;  55-63	9		Graphics Controller Registers
   170                              <1> 	;
   171                              <1> 	; Ref: Programmer's Guide to EGA, VGA, and Super VGA cards
   172                              <1> 	; (Richard F. Ferraro, 1994)  
   173                              <1> 
   174                              <1> 	;
   175                              <1> vga_mode_03h:  ; mode 03h, 80*25 text, CGA colors
   176                              <1> 	; 11/11/2020
   177 00007046 5018100010          <1>  	db	80, 24, 16, 00h, 10h ; tw, th-1, ch, slength (5)
   178 0000704B 00030002            <1>  	db	00h, 03h, 00h, 02h ; sequ regs (4)
   179 0000704F 67                  <1>  	db	67h	; misc reg (1)
   180 00007050 5F4F50825581BF1F    <1>  	db	5Fh, 4Fh, 50h, 82h, 55h, 81h, 0BFh, 1Fh
   181                              <1>  	; 09/11/2020
   182                              <1> 	;db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   183 00007058 004F                <1> 	db	00h, 4Fh
   184                              <1> vga_p_cm_pos equ $ - vga_mode_03h
   185 0000705A 0D0E00000000        <1> 	db	0Dh, 0Eh, 00h, 00h, 00h, 00h
   186 00007060 9C8E8F281F96B9A3    <1>  	db	9Ch, 8Eh, 8Fh, 28h, 1Fh, 96h, 0B9h, 0A3h
   187 00007068 FF                  <1> 	db	0FFh	; crtc_regs (25)
   188 00007069 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   189 00007071 38393A3B3C3D3E3F    <1>  	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   190                              <1>  	;db	0Ch, 00h, 0Fh, 08h  ; actl regs (20)
   191 00007079 0C000F00            <1> 	db	0Ch, 00h, 0Fh, 00h  ; 19/11/2020
   192 0000707D 0000000000100E0FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 10h, 0Eh, 0Fh, 0FFh ; grdc regs (9)
   193                              <1> 	; 09/11/2020
   194                              <1> 	;db	00h, 00h, 00h, 00h, 00h, 10h, 0Eh, 00h, 0FFh ; grdc regs (9)
   195                              <1> vga_mode_01h:	; mode 01h, 40*25 text, CGA colors
   196 00007086 2818100008          <1> 	db	40, 24, 16, 00h, 08h ; tw, th-1, ch, slength
   197 0000708B 08030002            <1> 	db	08h, 03h, 00h, 02h  ; sequ regs
   198 0000708F 67                  <1> 	db	67h	; misc reg
   199 00007090 2D2728902BA0BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 0A0h, 0BFh, 1Fh
   200 00007098 004F0D0E00000000    <1> 	db	00h, 4Fh, 0Dh, 0Eh, 00h, 00h, 00h, 00h
   201 000070A0 9C8E8F141F96B9A3    <1> 	db	9Ch, 8Eh, 8Fh, 14h, 1Fh, 96h, 0B9h, 0A3h
   202 000070A8 FF                  <1> 	db	0FFh	; crtc_regs
   203 000070A9 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   204 000070B1 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   205                              <1>  	;db	0Ch, 00h, 0Fh, 08h  ; actl regs (20)
   206 000070B9 0C000F00            <1> 	db	0Ch, 00h, 0Fh, 00h  ; 19/11/2020
   207 000070BD 0000000000100E0FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 10h, 0Eh, 0Fh, 0FFh ; grdc regs
   208                              <1> ;vga_mode_07h:	; mode 07h, 80*25 text, mono color
   209                              <1> ;	db	80, 24, 16, 00h, 10h  ; tw, th-1, ch, slength
   210                              <1> ;	db	00h, 03h, 00h, 02h ; sequ regs
   211                              <1> ;	db	66h	; misc reg
   212                              <1> ;	db	5Fh, 4Fh, 50h, 82h, 55h, 81h, 0BFh, 1Fh
   213                              <1> ;	db	00h, 4Fh, 0Dh, 0Eh, 00h, 00h, 00h, 00h
   214                              <1> ;	db	9Ch, 8Eh, 8Fh, 28h, 0Fh, 96h, 0B9h, 0A3h
   215                              <1> ;	db	0FFh	; crtc regs
   216                              <1> ;	db	00h, 08h, 08h, 08h, 08h, 08h, 08h, 08h
   217                              <1> ;	db	10h, 18h, 18h, 18h, 18h, 18h, 18h, 18h
   218                              <1> ;	db	0Eh, 00h, 0Fh, 08h  ; actl regs
   219                              <1> ;	db	00h, 00h, 00h, 00h, 00h, 10h, 0Ah, 0Fh, 0FFh ; grdc regs
   220                              <1> vga_mode_04h:	; 320*200 graphics, 4 colors, CGA
   221                              <1> 	; 11/11/2020
   222 000070C6 2818080040          <1> 	db	40, 24, 8, 00h, 40h ; tw, th-1, ch, slength
   223 000070CB 09030002            <1> 	db	09h, 03h, 00h, 02h ; sequ regs
   224 000070CF 63                  <1> 	db	63h	; misc reg
   225 000070D0 2D2728902B80BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 80h, 0BFh, 1Fh
   226 000070D8 00C1000000000000    <1> 	db	00h, 0C1h, 00h, 00h, 00h, 00h, 00h, 00h
   227 000070E0 9C8E8F140096B9A2    <1> 	db	9Ch, 8Eh, 8Fh, 14h, 00h, 96h, 0B9h, 0A2h
   228 000070E8 FF                  <1> 	db	0FFh	; crtc_regs
   229 000070E9 0013151702040607    <1> 	db	00h, 13h, 15h, 17h, 02h, 04h, 06h, 07h
   230 000070F1 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   231 000070F9 01000300            <1> 	db	01h, 00h, 03h, 00h ; actl regs
   232 000070FD 0000000000300F0FFF  <1> 	db 	00h, 00h, 00h, 00h, 00h, 30h, 0Fh, 0Fh, 0FFh ; grdc regs
   233                              <1> vga_mode_06h:	; 640*200 graphics, 2 colors, CGA
   234                              <1> 	; 11/11/2020
   235 00007106 5018080040          <1> 	db	80, 24, 8, 00h, 40h   ;	tw, th-1, ch, slength
   236 0000710B 01010006            <1> 	db	01h, 01h, 00h, 06h ; sequ regs
   237 0000710F 63                  <1> 	db	63h	; misc reg
   238 00007110 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   239 00007118 00C1000000000000    <1> 	db	00h, 0C1h, 00h, 00h, 00h, 00h, 00h, 00h
   240 00007120 9C8E8F280096B9C2    <1> 	db	9Ch, 8Eh, 8Fh, 28h, 00h, 96h, 0B9h, 0C2h
   241 00007128 FF                  <1> 	db	0FFh	; crtc regs
   242 00007129 0017171717171717    <1> 	db	00h, 17h, 17h, 17h, 17h, 17h, 17h, 17h
   243 00007131 1717171717171717    <1> 	db	17h, 17h, 17h, 17h, 17h, 17h, 17h, 17h
   244 00007139 01000100            <1> 	db	01h, 00h, 01, 00h  ; actl regs
   245 0000713D 0000000000000D0FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 0Dh, 0Fh, 0FFh ; grdc regs
   246                              <1> vga_mode_13h:  ; mode 13h, 300*200, 256 colors, linear
   247                              <1> 	; 11/11/2020
   248                              <1> 	;db 	40, 24, 8, 00h, 20h ; tw, th-1, ch, slength (5)
   249                              <1> 	; 23/11/2020 - 10/11/2020
   250 00007146 28180800FA          <1> 	db 	40, 24, 8, 00h, 0FAh ; tw, th-1, ch, slength (5)
   251 0000714B 010F000E            <1> 	db	01h, 0Fh, 00h, 0Eh ; sequ regs (4)
   252 0000714F 63                  <1> 	db	63h	; misc reg (1)
   253 00007150 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh 
   254 00007158 0041000000000000    <1> 	db 	00h, 041h, 00h, 00h, 00h, 00h, 00h, 00h
   255 00007160 9C8E8F284096B9A3    <1> 	db	9Ch, 8Eh, 8Fh, 28h, 40h, 96h, 0B9h, 0A3h
   256 00007168 FF                  <1> 	db	0FFh	; crtc regs (25)
   257 00007169 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   258 00007171 08090A0B0C0D0E0F    <1>  	db	08h, 09h, 0Ah, 0Bh, 0Ch, 0Dh, 0Eh, 0Fh
   259 00007179 41000F00            <1>  	db	41h, 00h, 0Fh, 00h  ; actl regs (20)
   260                              <1> 	; 10/11/2020
   261                              <1>  	;db	41h, 01h, 0Fh, 13h  ; actl regs (20) 
   262 0000717D 000000000040050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 40h, 05h, 0Fh, 0FFh ; grdc regs (9)
   263                              <1> vga_mode_setl equ $ - vga_mode_13h  ; = 64
   264                              <1> vga_mode_F0h:  ; mode X ; 320*240, 256 colors, planar
   265 00007186 2818080000          <1> 	db 	40, 24, 8, 00h, 00h ; tw, th-1, ch, slength
   266 0000718B 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   267 0000718F E3                  <1> 	db	0E3h	; misc reg
   268 00007190 5F4F508254800D3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Dh, 3Eh 
   269 00007198 0041000000000000    <1>  	db 	00h, 41h, 00h, 00h, 00h, 00h, 00h, 00h
   270 000071A0 EAACDF2800E706E3    <1> 	db	0EAh, 0ACh, 0DFh, 28h, 00h, 0E7h, 06h, 0E3h
   271 000071A8 FF                  <1> 	db	0FFh	; crtc regs (25)
   272 000071A9 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   273 000071B1 08090A0B0C0D0E0F    <1>  	db	08h, 09h, 0Ah, 0Bh, 0Ch, 0Dh, 0Eh, 0Fh
   274 000071B9 41000F00            <1>  	db	41h, 00h, 0Fh, 00h  ; actl regs
   275 000071BD 000000000040050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 40h, 05h, 0Fh, 0FFh ; grdc regs
   276                              <1> vga_mode_12h:  ; mode 12h, 640*480, 16 colors, planar
   277                              <1> 	; 11/11/2020
   278                              <1>  	;db 	80, 29, 16, 0, 0 ; tw, th-1, ch, slength
   279                              <1> 	; 09/11/2020
   280 000071C6 501D1000A0          <1>  	db 	80, 29, 16, 00h, 0A0h ; tw, th-1, ch, slength
   281 000071CB 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   282 000071CF E3                  <1> 	db 	0E3h	; misc reg
   283 000071D0 5F4F508254800B3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Bh, 3Eh
   284                              <1> 	; 09/11/2020
   285                              <1> 	;db	5Fh, 4Fh, 50h, 82h, 53h, 9Fh, 0Bh, 3Eh
   286 000071D8 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   287 000071E0 EA8CDF2800E704E3    <1>  	db	0EAh, 8Ch, 0DFh, 28h, 00h, 0E7h, 04h, 0E3h
   288                              <1> 	; 09/11/2020
   289                              <1>  	;db	0E9h, 8Bh, 0DFh, 28h, 00h, 0E7h, 04h, 0E3h
   290 000071E8 FF                  <1> 	db	0FFh	; crtc regs
   291 000071E9 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   292 000071F1 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   293 000071F9 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   294 000071FD 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   295                              <1> vga_mode_6Ah:  ; mode 6Ah, 800*600, 16 colors, planar
   296                              <1> 	; 11/11/2020
   297 00007206 6424100000          <1>  	db 	100, 36, 16, 00h, 00h ; tw, th-1, ch, slength
   298 0000720B 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   299 0000720F E3                  <1> 	db 	0E3h	; misc reg
   300 00007210 7F6363836B1B72F0    <1> 	db	7Fh, 63h, 63h, 83h, 6Bh, 1Bh, 72h, 0F0h
   301 00007218 0060000000000000    <1> 	db	00h, 60h, 00h, 00h, 00h, 00h, 00h, 00h
   302 00007220 598D5732005773E3    <1>  	db	59h, 8Dh, 57h, 32h, 00h, 57h, 73h, 0E3h
   303 00007228 FF                  <1> 	db	0FFh	; crtc regs
   304 00007229 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   305 00007231 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   306 00007239 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   307 0000723D 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   308                              <1> vga_mode_0Dh:  ; mode 0Dh, 320*200, 16 colors, planar
   309 00007246 2818080020          <1>  	db 	40, 24, 8, 00h, 20h ; tw, th-1, ch, slength
   310 0000724B 090F0006            <1> 	db	09h, 0Fh, 00h, 06h ; sequ regs
   311 0000724F 63                  <1> 	db 	63h	; misc reg
   312 00007250 2D2728902B80BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 80h, 0BFh, 1Fh
   313 00007258 00C0000000000000    <1> 	db	00h, 0C0h, 00h, 00h, 00h, 00h, 00h, 00h
   314 00007260 9C8E8F140096B9E3    <1>  	db	9Ch, 8Eh, 8Fh, 14h, 00h, 96h, 0B9h, 0E3h
   315 00007268 FF                  <1> 	db	0FFh	; crtc regs
   316 00007269 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   317 00007271 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   318 00007279 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   319 0000727D 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   320                              <1> vga_mode_0Eh:  ; mode 0Eh, 640*200, 16 colors, planar
   321 00007286 5018080040          <1>  	db 	80, 24, 8, 00h, 40h ; tw, th-1, ch, slength
   322 0000728B 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   323 0000728F 63                  <1> 	db 	63h	; misc reg
   324 00007290 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   325 00007298 00C0000000000000    <1> 	db	00h, 0C0h, 00h, 00h, 00h, 00h, 00h, 00h
   326 000072A0 9C8E8F280096B9E3    <1>  	db	9Ch, 8Eh, 8Fh, 28h, 00h, 96h, 0B9h, 0E3h
   327 000072A8 FF                  <1> 	db	0FFh	; crtc regs
   328 000072A9 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   329 000072B1 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   330 000072B9 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   331 000072BD 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   332                              <1> vga_mode_10h: ; mode 10h, 640*350, 16 colors, planar
   333 000072C6 50180E0080          <1>  	db 	80, 24, 14, 00h, 80h ; tw, th-1, ch, slength
   334 000072CB 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   335 000072CF A3                  <1> 	db 	0A3h	; misc reg
   336 000072D0 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   337 000072D8 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   338 000072E0 83855D280F63BAE3    <1>  	db	83h, 85h, 5Dh, 28h, 0Fh, 63h, 0BAh, 0E3h
   339 000072E8 FF                  <1> 	db	0FFh	; crtc regs
   340 000072E9 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   341 000072F1 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   342 000072F9 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   343 000072FD 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   344                              <1> vga_mode_11h: ; mode 11h, 640*480, mono color, planar
   345                              <1>  	; 11/11/2020
   346 00007306 501D1000A0          <1> 	db 	80, 29, 16, 00h, 0A0h ; tw, th-1, ch, slength
   347 0000730B 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   348 0000730F E3                  <1> 	db 	0E3h	; misc reg
   349 00007310 5F4F508254800B3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Bh, 3Eh
   350 00007318 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   351 00007320 EA8CDF2800E704C3    <1>  	db	0EAh, 8Ch, 0DFh, 28h, 00h, 0E7h, 04h, 0C3h ; 11/11/2020
   352 00007328 FF                  <1> 	db	0FFh	; crtc regs
   353 00007329 003F003F003F003F    <1> 	db	00h, 3Fh, 00h, 3Fh, 00h, 3Fh, 00h, 3Fh
   354 00007331 003F003F003F003F    <1> 	db	00h, 3Fh, 00h, 3Fh, 00h, 3Fh, 00h, 3Fh
   355 00007339 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   356 0000733D 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   357                              <1> end_of_vga_params:
   358                              <1> 
   359                              <1> ; /// End Of VIDEO DATA ///
   360                              <1> 
   361                              <1> ; 23/11/2020
   362                              <1> ; VBE 2 BOCHS/QEMU emulator extensions 
   363                              <1> ;	for TRDOS 386 v2 kernel (video bios)  
   364                              <1> 
   365                              <1> ; vbetables.h by Volker Rupper (02/01/2020)
   366                              <1> 
   367                              <1> b_vbe_modes:
   368                              <1> 	;/* standard VESA modes */	
   369 00007346 0001800290010800    <1> 	dw 100h,  640, 400,  8
   370 0000734E 01018002E0010800    <1> 	dw 101h,  640, 480,  8
   371 00007356 0301200358020800    <1> 	dw 103h,  800, 600,  8
   372 0000735E 0501000400030800    <1> 	dw 105h, 1024, 768,  8
   373 00007366 0E014001C8001000    <1> 	dw 10Eh,  320, 200, 16
   374 0000736E 0F014001C8001800    <1> 	dw 10Fh,  320, 200, 24
   375 00007376 11018002E0011000    <1> 	dw 111h,  640, 480, 16
   376 0000737E 12018002E0011800    <1> 	dw 112h,  640, 480, 24
   377 00007386 1401200358021000    <1> 	dw 114h,  800, 600, 16
   378 0000738E 1501200358021800    <1> 	dw 115h,  800, 600, 24
   379 00007396 1701000400031000    <1> 	dw 117h, 1024, 768, 16
   380 0000739E 1801000400031800    <1> 	dw 118h, 1024, 768, 24
   381                              <1> 
   382                              <1> ;/* BOCHS/PLEX86 'own' mode numbers */
   383 000073A6 40014001C8002000    <1> 	dw 140h,  320,  200, 32
   384 000073AE 4101800290012000    <1> 	dw 141h,  640,  400, 32
   385 000073B6 42018002E0012000    <1> 	dw 142h,  640,  480, 32
   386 000073BE 4301200358022000    <1> 	dw 143h,  800,  600, 32
   387 000073C6 4401000400032000    <1> 	dw 144h, 1024,  768, 32
   388 000073CE 46014001C8000800    <1> 	dw 146h,  320,  200,  8
   389 000073D6 8D010005D0021000    <1> 	dw 18Dh, 1280,  720, 16
   390 000073DE 8E010005D0021800    <1> 	dw 18Eh, 1280,  720, 24
   391 000073E6 8F010005D0022000    <1> 	dw 18Fh, 1280,  720, 32
   392 000073EE 9001800738041000    <1> 	dw 190h, 1920, 1080, 16
   393 000073F6 9101800738041800    <1> 	dw 191h, 1920, 1080, 24
   394 000073FE 9201800738042000    <1> 	dw 192h, 1920, 1080, 32
   395                              <1> 
   396                              <1> end_of_b_vbe_modes:
   397                              <1> 
   398                              <1> MA1 equ VBE_MODE_ATTRIBUTE_SUPPORTED
   399                              <1> MA2 equ VBE_MODE_ATTRIBUTE_EXTENDED_INFO_AVAILABLE
   400                              <1> MA3 equ VBE_MODE_ATTRIBUTE_COLOR_MODE
   401                              <1> MA4 equ VBE_MODE_ATTRIBUTE_LINEAR_FRAME_BUFFER_MODE
   402                              <1> MA5 equ	VBE_MODE_ATTRIBUTE_GRAPHICS_MODE
   403                              <1> 
   404                              <1> MODE_ATTRIBUTES equ MA1|MA2|MA3|MA4|MA5
   405                              <1> 
   406                              <1> WA1 equ VBE_WINDOW_ATTRIBUTE_RELOCATABLE
   407                              <1> WA2 equ	VBE_WINDOW_ATTRIBUTE_READABLE
   408                              <1> WA3 equ VBE_WINDOW_ATTRIBUTE_WRITEABLE
   409                              <1> 
   410                              <1> WINA_ATTRIBUTES equ WA1|WA2|WA3
   411                              <1> 
   412                              <1> ; 24/11/2020
   413                              <1> 
   414                              <1> %if 0
   415                              <1> 
   416                              <1> MODE_INFO_LIST: 
   417                              <1> 
   418                              <1> ; 24/11/2020
   419                              <1> ; '%if 0' disables 24 mode info tables here, until %endif 
   420                              <1> ; ('set_mode_info_list' will set only 1 list for selected mode)
   421                              <1> ; (Purpose: To save about 1 KB kernel size by removing fixed data)
   422                              <1> 
   423                              <1> 			dw	0100h ; 640x400x8 
   424                              <1> ModeAttributes1: 	dw	MODE_ATTRIBUTES
   425                              <1> WinAAttributes1: 	db	WINA_ATTRIBUTES
   426                              <1> WinBAttributes1: 	db	0
   427                              <1> WinGranularity1: 	dw	VBE_DISPI_BANK_SIZE_KB
   428                              <1> WinSize1: 		dw	VBE_DISPI_BANK_SIZE_KB
   429                              <1> WinASegment1:		dw	VGAMEM_GRAPH
   430                              <1> WinBSegment1:		dw	0000h
   431                              <1> WinFuncPtr1:		dd	0
   432                              <1> BytesPerScanLine1: 	dw	640
   433                              <1> XResolution1:		dw	640
   434                              <1> YResolution1:		dw	400
   435                              <1> XCharSize1:		db	8
   436                              <1> YCharSize1:		db	16
   437                              <1> NumberOfPlanes1: 	db	1
   438                              <1> BitsPerPixel1:		db	8
   439                              <1> NumberOfBanks1:		db	4
   440                              <1> MemoryModel1:		db	VBE_MEMORYMODEL_PACKED_PIXEL
   441                              <1> BankSize1:		db	0
   442                              <1> NumberOfImagePages1: 	db	64
   443                              <1> Reserved_page1:		db	0
   444                              <1> RedMaskSize1:		db	0
   445                              <1> RedFieldPosition1: 	db	0
   446                              <1> GreenMaskSize1:		db	0
   447                              <1> GreenFieldPosition1: 	db	0
   448                              <1> BlueMaskSize1:		db	0
   449                              <1> BlueFieldPosition1: 	db	0
   450                              <1> RsvdMaskSize1: 		db	0
   451                              <1> RsvdFieldPosition1: 	db	0
   452                              <1> DirectColorModeInfo1: 	db	0
   453                              <1> PhysBasePtr1:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
   454                              <1> OffScreenMemOffset1: 	dd	0
   455                              <1> OffScreenMemSize1: 	dw	0
   456                              <1> LinBytesPerScanLine1: 	dw	640
   457                              <1> BnkNumberOfPages1: 	db	0
   458                              <1> LinNumberOfPages1: 	db	0
   459                              <1> LinRedMaskSize1:	db	0
   460                              <1> LinRedFieldPosition1: 	db	0
   461                              <1> LinGreenMaskSize1: 	db	0
   462                              <1> LinGreenFieldPosition1: db	0
   463                              <1> LinBlueMaskSize1: 	db	0
   464                              <1> LinBlueFieldPosition1: 	db	0
   465                              <1> LinRsvdMaskSize1: 	db	0
   466                              <1> LinRsvdFieldPosition1: 	db	0
   467                              <1> MaxPixelClock1:		dd	0
   468                              <1> 
   469                              <1> 			dw	0101h ; 640x480x8
   470                              <1> ModeAttributes2: 	dw	MODE_ATTRIBUTES
   471                              <1> WinAAttributes2: 	db	WINA_ATTRIBUTES
   472                              <1> WinBAttributes2: 	db	0
   473                              <1> WinGranularity2: 	dw	VBE_DISPI_BANK_SIZE_KB
   474                              <1> WinSize2: 		dw	VBE_DISPI_BANK_SIZE_KB
   475                              <1> WinASegment2:		dw	VGAMEM_GRAPH
   476                              <1> WinBSegment2:		dw	0000h
   477                              <1> WinFuncPtr2:		dd	0
   478                              <1> BytesPerScanLine2:	dw	640
   479                              <1> XResolution2:		dw	640
   480                              <1> YResolution2:		dw	480
   481                              <1> XCharSize2:		db	8
   482                              <1> YCharSize2:		db	16
   483                              <1> NumberOfPlanes2:	db	1
   484                              <1> BitsPerPixel2:		db	8
   485                              <1> NumberOfBanks2:		db	5
   486                              <1> MemoryModel2:		db	VBE_MEMORYMODEL_PACKED_PIXEL
   487                              <1> BankSize2:		db	0
   488                              <1> NumberOfImagePages2:	db	53
   489                              <1> Reserved_page2:		db	0
   490                              <1> RedMaskSize2:		db	0
   491                              <1> RedFieldPosition2:	db	0
   492                              <1> GreenMaskSize2:		db	0
   493                              <1> GreenFieldPosition2:	db	0
   494                              <1> BlueMaskSize2:		db	0
   495                              <1> BlueFieldPosition2:	db	0
   496                              <1> RsvdMaskSize2:		db	0
   497                              <1> RsvdFieldPosition2:	db	0
   498                              <1> DirectColorModeInfo2:	db	0
   499                              <1> PhysBasePtr2:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
   500                              <1> OffScreenMemOffset2:	dd	0
   501                              <1> OffScreenMemSize2:	dw	0
   502                              <1> LinBytesPerScanLine2:	dw	640
   503                              <1> BnkNumberOfPages2: 	db	0
   504                              <1> LinNumberOfPages2: 	db	0
   505                              <1> LinRedMaskSize2:	db	0
   506                              <1> LinRedFieldPosition2: 	db	0
   507                              <1> LinGreenMaskSize2: 	db	0
   508                              <1> LinGreenFieldPosition2: db	0
   509                              <1> LinBlueMaskSize2: 	db	0
   510                              <1> LinBlueFieldPosition2: 	db	0
   511                              <1> LinRsvdMaskSize2: 	db	0
   512                              <1> LinRsvdFieldPosition2: 	db	0
   513                              <1> MaxPixelClock2:		dd	0
   514                              <1> 			
   515                              <1> 			dw	0103h ; 800x600x8
   516                              <1> ModeAttributes3: 	dw	MODE_ATTRIBUTES
   517                              <1> WinAAttributes3: 	db	WINA_ATTRIBUTES
   518                              <1> WinBAttributes3: 	db	0
   519                              <1> WinGranularity3: 	dw	VBE_DISPI_BANK_SIZE_KB
   520                              <1> WinSize3: 		dw	VBE_DISPI_BANK_SIZE_KB
   521                              <1> WinASegment3:		dw	VGAMEM_GRAPH
   522                              <1> WinBSegment3:		dw	0000h
   523                              <1> WinFuncPtr3:		dd	0
   524                              <1> BytesPerScanLine3:	dw	800
   525                              <1> XResolution3:		dw	800
   526                              <1> YResolution3:		dw	600
   527                              <1> XCharSize3:		db	8
   528                              <1> YCharSize3:		db	16
   529                              <1> NumberOfPlanes3:	db	1
   530                              <1> BitsPerPixel3:		db	8
   531                              <1> NumberOfBanks3:		db	8
   532                              <1> MemoryModel3:		db	VBE_MEMORYMODEL_PACKED_PIXEL
   533                              <1> BankSize3:		db	0
   534                              <1> NumberOfImagePages3:	db	33
   535                              <1> Reserved_page3:		db	0
   536                              <1> RedMaskSize3:		db	0
   537                              <1> RedFieldPosition3:	db	0
   538                              <1> GreenMaskSize3:		db	0
   539                              <1> GreenFieldPosition3:	db	0
   540                              <1> BlueMaskSize3:		db	0
   541                              <1> BlueFieldPosition3:	db	0
   542                              <1> RsvdMaskSize3:		db	0
   543                              <1> RsvdFieldPosition3:	db	0
   544                              <1> DirectColorModeInfo3:	db	0
   545                              <1> PhysBasePtr3:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
   546                              <1> OffScreenMemOffset3:	dd	0
   547                              <1> OffScreenMemSize3:	dw	0
   548                              <1> LinBytesPerScanLine3:	dw	800
   549                              <1> BnkNumberOfPages3: 	db	0
   550                              <1> LinNumberOfPages3: 	db	0
   551                              <1> LinRedMaskSize3:	db	0
   552                              <1> LinRedFieldPosition3: 	db	0
   553                              <1> LinGreenMaskSize3: 	db	0
   554                              <1> LinGreenFieldPosition: 	db	0
   555                              <1> LinBlueMaskSize: 	db	0
   556                              <1> LinBlueFieldPosition: 	db	0
   557                              <1> LinRsvdMaskSize: 	db	0
   558                              <1> LinRsvdFieldPosition: 	db	0
   559                              <1> MaxPixelClock:		dd	0
   560                              <1> 			
   561                              <1> 			dw	0105h ; 1024x768x8
   562                              <1> ModeAttributes4: 	dw	MODE_ATTRIBUTES
   563                              <1> WinAAttributes4: 	db	WINA_ATTRIBUTES
   564                              <1> WinBAttributes4: 	db	0
   565                              <1> WinGranularity4: 	dw	VBE_DISPI_BANK_SIZE_KB
   566                              <1> WinSize4: 		dw	VBE_DISPI_BANK_SIZE_KB
   567                              <1> WinASegment4:		dw	VGAMEM_GRAPH
   568                              <1> WinBSegment4:		dw	0000h
   569                              <1> WinFuncPtr4:		dd	0
   570                              <1> BytesPerScanLine4:	dw	1024
   571                              <1> XResolution4:		dw	1024
   572                              <1> YResolution4:		dw	768
   573                              <1> XCharSize4:		db	8
   574                              <1> YCharSize4:		db	16
   575                              <1> NumberOfPlanes4:	db	1
   576                              <1> BitsPerPixel4:		db	8
   577                              <1> NumberOfBanks4:		db	12
   578                              <1> MemoryModel4:		db	VBE_MEMORYMODEL_PACKED_PIXEL
   579                              <1> BankSize4:		db	0
   580                              <1> NumberOfImagePages4:	db	20
   581                              <1> Reserved_page4:		db	0
   582                              <1> RedMaskSize4:		db	0
   583                              <1> RedFieldPosition4:	db	0
   584                              <1> GreenMaskSize4:		db	0
   585                              <1> GreenFieldPosition4:	db	0
   586                              <1> BlueMaskSize4:		db	0
   587                              <1> BlueFieldPosition4:	db	0
   588                              <1> RsvdMaskSize4:		db	0
   589                              <1> RsvdFieldPosition4:	db	0
   590                              <1> DirectColorModeInfo4:	db	0
   591                              <1> PhysBasePtr4:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
   592                              <1> OffScreenMemOffset4:	dd	0
   593                              <1> OffScreenMemSize4:	dw	0
   594                              <1> LinBytesPerScanLine4:	dw	1024
   595                              <1> BnkNumberOfPages4: 	db	0
   596                              <1> LinNumberOfPages4: 	db	0
   597                              <1> LinRedMaskSize4:	db	0
   598                              <1> LinRedFieldPosition4: 	db	0
   599                              <1> LinGreenMaskSize4: 	db	0
   600                              <1> LinGreenFieldPosition4: db	0
   601                              <1> LinBlueMaskSize4: 	db	0
   602                              <1> LinBlueFieldPosition4: 	db	0
   603                              <1> LinRsvdMaskSize4: 	db	0
   604                              <1> LinRsvdFieldPosition4: 	db	0
   605                              <1> MaxPixelClock4:		dd	0
   606                              <1> 
   607                              <1> 			dw	010Eh ; 320x200x16
   608                              <1> ModeAttributes5: 	dw	MODE_ATTRIBUTES
   609                              <1> WinAAttributes5: 	db	WINA_ATTRIBUTES
   610                              <1> WinBAttributes5: 	db	0
   611                              <1> WinGranularity5: 	dw	VBE_DISPI_BANK_SIZE_KB
   612                              <1> WinSize5: 		dw	VBE_DISPI_BANK_SIZE_KB
   613                              <1> WinASegment5:		dw	VGAMEM_GRAPH
   614                              <1> WinBSegment5:		dw	0000h
   615                              <1> WinFuncPtr5:		dd	0
   616                              <1> BytesPerScanLine5:	dw	640
   617                              <1> XResolution5:		dw	320
   618                              <1> YResolution5:		dw	200
   619                              <1> XCharSize5:		db	8
   620                              <1> YCharSize5:		db	16
   621                              <1> NumberOfPlanes5:	db	1
   622                              <1> BitsPerPixel5:		db	16
   623                              <1> NumberOfBanks5:		db	2
   624                              <1> MemoryModel5:		db	VBE_MEMORYMODEL_DIRECT_COLOR
   625                              <1> BankSize5:		db	0
   626                              <1> NumberOfImagePages5:	db	130
   627                              <1> Reserved_page5:		db	0
   628                              <1> RedMaskSize5:		db	5
   629                              <1> RedFieldPosition5:	db	11
   630                              <1> GreenMaskSize5:		db	6
   631                              <1> GreenFieldPosition5:	db	5
   632                              <1> BlueMaskSize5:		db	5
   633                              <1> BlueFieldPosition5:	db	0
   634                              <1> RsvdMaskSize5:		db	0
   635                              <1> RsvdFieldPosition5:	db	0
   636                              <1> DirectColorModeInfo5:	db	0
   637                              <1> PhysBasePtr5:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
   638                              <1> OffScreenMemOffset5:	dd	0
   639                              <1> OffScreenMemSize5:	dw	0
   640                              <1> LinBytesPerScanLine5:	dw	640
   641                              <1> BnkNumberOfPages5: 	db	0
   642                              <1> LinNumberOfPages5: 	db	0
   643                              <1> LinRedMaskSize5:	db	5
   644                              <1> LinRedFieldPosition5:	db	11
   645                              <1> LinGreenMaskSize5:	db	6
   646                              <1> LinGreenFieldPosition5:	db	5
   647                              <1> LinBlueMaskSize5:	db	5
   648                              <1> LinBlueFieldPosition5:	db	0
   649                              <1> LinRsvdMaskSize5:	db	0
   650                              <1> LinRsvdFieldPosition5:	db	0
   651                              <1> MaxPixelClock5:		dd	0
   652                              <1> 	
   653                              <1> 			dw	010Fh ; 320x200x24
   654                              <1> ModeAttributes6: 	dw	MODE_ATTRIBUTES
   655                              <1> WinAAttributes6: 	db	WINA_ATTRIBUTES
   656                              <1> WinBAttributes6: 	db	0
   657                              <1> WinGranularity6: 	dw	VBE_DISPI_BANK_SIZE_KB
   658                              <1> WinSize6: 		dw	VBE_DISPI_BANK_SIZE_KB
   659                              <1> WinASegment6:		dw	VGAMEM_GRAPH
   660                              <1> WinBSegment6:		dw	0000h
   661                              <1> WinFuncPtr6:		dd	0
   662                              <1> BytesPerScanLine6:	dw	960
   663                              <1> XResolution6:		dw	320
   664                              <1> YResolution6:		dw	200
   665                              <1> XCharSize6:		db	8
   666                              <1> YCharSize6:		db	16
   667                              <1> NumberOfPlanes6:	db	1
   668                              <1> BitsPerPixel6:		db	24
   669                              <1> NumberOfBanks6:		db	3
   670                              <1> MemoryModel6:		db	VBE_MEMORYMODEL_DIRECT_COLOR
   671                              <1> BankSize6:		db	0
   672                              <1> NumberOfImagePages6:	db	86
   673                              <1> Reserved_page6:		db	0
   674                              <1> RedMaskSize6:		db	8
   675                              <1> RedFieldPosition6:	db	16
   676                              <1> GreenMaskSize6:		db	8
   677                              <1> GreenFieldPosition6:	db	8
   678                              <1> BlueMaskSize6:		db	8
   679                              <1> BlueFieldPosition6:	db	0
   680                              <1> RsvdMaskSize6:		db	0
   681                              <1> RsvdFieldPosition6:	db	0
   682                              <1> DirectColorModeInfo6:	db	0
   683                              <1> PhysBasePtr6:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
   684                              <1> OffScreenMemOffset6:	dd	0
   685                              <1> OffScreenMemSize6:	dw	0
   686                              <1> LinBytesPerScanLine6:	dw	960
   687                              <1> BnkNumberOfPages6: 	db	0
   688                              <1> LinNumberOfPages6: 	db	0
   689                              <1> LinRedMaskSize6:	db	8
   690                              <1> LinRedFieldPosition6:	db	16
   691                              <1> LinGreenMaskSize6:	db	8
   692                              <1> LinGreenFieldPosition6:	db	8
   693                              <1> LinBlueMaskSize6:	db	8
   694                              <1> LinBlueFieldPosition6:	db	0
   695                              <1> LinRsvdMaskSize6:	db	0
   696                              <1> LinRsvdFieldPosition6:	db	0
   697                              <1> MaxPixelClock6:		dd	0
   698                              <1> 	
   699                              <1> 			dw	0111h ; 640x480x16
   700                              <1> ModeAttributes7: 	dw	MODE_ATTRIBUTES
   701                              <1> WinAAttributes7: 	db	WINA_ATTRIBUTES
   702                              <1> WinBAttributes7: 	db	0
   703                              <1> WinGranularity7: 	dw	VBE_DISPI_BANK_SIZE_KB
   704                              <1> WinSize7: 		dw	VBE_DISPI_BANK_SIZE_KB
   705                              <1> WinASegment7:		dw	VGAMEM_GRAPH
   706                              <1> WinBSegment7:		dw	0000h
   707                              <1> WinFuncPtr7:		dd	0
   708                              <1> BytesPerScanLine7:	dw	1280
   709                              <1> XResolution7:		dw	640
   710                              <1> YResolution7:		dw	480
   711                              <1> XCharSize7:		db	8
   712                              <1> YCharSize7:		db	16
   713                              <1> NumberOfPlanes7:	db	1
   714                              <1> BitsPerPixel7:		db	16
   715                              <1> NumberOfBanks7:		db	10
   716                              <1> MemoryModel7:		db	VBE_MEMORYMODEL_DIRECT_COLOR
   717                              <1> BankSize7:		db	0
   718                              <1> NumberOfImagePages7:	db	26
   719                              <1> Reserved_page7:		db	0
   720                              <1> RedMaskSize7:		db	5
   721                              <1> RedFieldPosition7:	db	11
   722                              <1> GreenMaskSize7:		db	6
   723                              <1> GreenFieldPosition7:	db	5
   724                              <1> BlueMaskSize7:		db	5
   725                              <1> BlueFieldPosition7:	db	0
   726                              <1> RsvdMaskSize7:		db	0
   727                              <1> RsvdFieldPosition7:	db	0
   728                              <1> DirectColorModeInfo7:	db	0
   729                              <1> PhysBasePtr7:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS,
   730                              <1> OffScreenMemOffset7:	dd	0
   731                              <1> OffScreenMemSize7:	dw	0
   732                              <1> LinBytesPerScanLine7:	dw	1280
   733                              <1> BnkNumberOfPages7: 	db	0
   734                              <1> LinNumberOfPages7: 	db	0
   735                              <1> LinRedMaskSize7:	db	5
   736                              <1> LinRedFieldPosition7:	db	11
   737                              <1> LinGreenMaskSize7:	db	6
   738                              <1> LinGreenFieldPosition7:	db	5
   739                              <1> LinBlueMaskSize7:	db	5
   740                              <1> LinBlueFieldPosition7:	db	0
   741                              <1> LinRsvdMaskSize7:	db	0
   742                              <1> LinRsvdFieldPosition7:	db	0
   743                              <1> MaxPixelClock7:		dd	0
   744                              <1> 
   745                              <1> 			dw	0112h ; 640x480x24
   746                              <1> ModeAttributes8: 	dw	MODE_ATTRIBUTES
   747                              <1> WinAAttributes8: 	db	WINA_ATTRIBUTES
   748                              <1> WinBAttributes8: 	db	0
   749                              <1> WinGranularity8: 	dw	VBE_DISPI_BANK_SIZE_KB
   750                              <1> WinSize8: 		dw	VBE_DISPI_BANK_SIZE_KB
   751                              <1> WinASegment8:		dw	VGAMEM_GRAPH
   752                              <1> WinBSegment8:		dw	0000h
   753                              <1> WinFuncPtr8:		dd	0
   754                              <1> BytesPerScanLine8:	dw	1920
   755                              <1> XResolution8:		dw	640
   756                              <1> YResolution8:		dw	480
   757                              <1> XCharSize8:		db	8
   758                              <1> YCharSize8:		db	16
   759                              <1> NumberOfPlanes8:	db	1
   760                              <1> BitsPerPixel8:		db	24
   761                              <1> NumberOfBanks8:		db	15
   762                              <1> MemoryModel8:		db	VBE_MEMORYMODEL_DIRECT_COLOR
   763                              <1> BankSize8:		db	0
   764                              <1> NumberOfImagePages8:	db	17
   765                              <1> Reserved_page8:		db	0
   766                              <1> RedMaskSize8:		db	8
   767                              <1> RedFieldPosition8:	db	16
   768                              <1> GreenMaskSize8:		db	8
   769                              <1> GreenFieldPosition8:	db	8
   770                              <1> BlueMaskSize8:		db	8
   771                              <1> BlueFieldPosition8:	db	0
   772                              <1> RsvdMaskSize8:		db	0
   773                              <1> RsvdFieldPosition8:	db	0
   774                              <1> DirectColorModeInfo8:	db	0
   775                              <1> PhysBasePtr8:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
   776                              <1> OffScreenMemOffset8:	dd	0
   777                              <1> OffScreenMemSize8:	dw	0
   778                              <1> LinBytesPerScanLine8:	dw	1920
   779                              <1> BnkNumberOfPages8: 	db	0
   780                              <1> LinNumberOfPages8: 	db	0
   781                              <1> LinRedMaskSize8:	db	8
   782                              <1> LinRedFieldPosition8:	db	16
   783                              <1> LinGreenMaskSize8:	db	8
   784                              <1> LinGreenFieldPosition8:	db	8
   785                              <1> LinBlueMaskSize8:	db	8
   786                              <1> LinBlueFieldPosition8:	db	0
   787                              <1> LinRsvdMaskSize8:	db	0
   788                              <1> LinRsvdFieldPosition8:	db	0
   789                              <1> MaxPixelClock8:		dd	0
   790                              <1> 
   791                              <1> 			dw	0114h ; 800x600x16
   792                              <1> ModeAttributes9: 	dw	MODE_ATTRIBUTES
   793                              <1> WinAAttributes9: 	db	WINA_ATTRIBUTES
   794                              <1> WinBAttributes9: 	db	0
   795                              <1> WinGranularity9: 	dw	VBE_DISPI_BANK_SIZE_KB
   796                              <1> WinSize9: 		dw	VBE_DISPI_BANK_SIZE_KB
   797                              <1> WinASegment9:		dw	VGAMEM_GRAPH
   798                              <1> WinBSegment9:		dw	0000h
   799                              <1> WinFuncPtr9:		dd	0
   800                              <1> BytesPerScanLine9:	dw	1600
   801                              <1> XResolution9:		dw	800
   802                              <1> YResolution9:		dw	600
   803                              <1> XCharSize9:		db	8
   804                              <1> YCharSize9:		db	16
   805                              <1> NumberOfPlanes9:	db	1
   806                              <1> BitsPerPixel9:		db	16
   807                              <1> NumberOfBanks9:		db	15
   808                              <1> MemoryModel9:		db	VBE_MEMORYMODEL_DIRECT_COLOR
   809                              <1> BankSize9:		db	0
   810                              <1> NumberOfImagePages9:	db	16
   811                              <1> Reserved_page9:		db	0
   812                              <1> RedMaskSize9:		db	5
   813                              <1> RedFieldPosition9:	db	11
   814                              <1> GreenMaskSize9:		db	6
   815                              <1> GreenFieldPosition9:	db	5
   816                              <1> BlueMaskSize9:		db	5
   817                              <1> BlueFieldPosition9:	db	0
   818                              <1> RsvdMaskSize9:		db	0
   819                              <1> RsvdFieldPosition9:	db	0
   820                              <1> DirectColorModeInfo9:	db	0
   821                              <1> PhysBasePtr9:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
   822                              <1> OffScreenMemOffset9:	dd	0
   823                              <1> OffScreenMemSize9:	dw	0
   824                              <1> LinBytesPerScanLine9:	dw	1600
   825                              <1> BnkNumberOfPages9: 	db	0
   826                              <1> LinNumberOfPages9: 	db	0
   827                              <1> LinRedMaskSize9:	db	5
   828                              <1> LinRedFieldPosition9:	db	11
   829                              <1> LinGreenMaskSize9:	db	6
   830                              <1> LinGreenFieldPosition9:	db	5
   831                              <1> LinBlueMaskSize9:	db	5
   832                              <1> LinBlueFieldPosition9:	db	0
   833                              <1> LinRsvdMaskSize9:	db	0
   834                              <1> LinRsvdFieldPosition9:	db	0
   835                              <1> MaxPixelClock9:		dd	0
   836                              <1> 	
   837                              <1> 			dw	0115h ; 800x600x24
   838                              <1> ModeAttributes10: 	dw	MODE_ATTRIBUTES
   839                              <1> WinAAttributes10: 	db	WINA_ATTRIBUTES
   840                              <1> WinBAttributes10: 	db	0
   841                              <1> WinGranularity10: 	dw	VBE_DISPI_BANK_SIZE_KB
   842                              <1> WinSize10: 		dw	VBE_DISPI_BANK_SIZE_KB
   843                              <1> WinASegment10:		dw	VGAMEM_GRAPH
   844                              <1> WinBSegment10:		dw	0000h
   845                              <1> WinFuncPtr10:		dd	0
   846                              <1> BytesPerScanLine10:	dw	2400
   847                              <1> XResolution10:		dw	800
   848                              <1> YResolution10:		dw	600
   849                              <1> XCharSize10:		db	8
   850                              <1> YCharSize10:		db	16
   851                              <1> NumberOfPlanes10:	db	1
   852                              <1> BitsPerPixel10:		db	24
   853                              <1> NumberOfBanks10:	db	22
   854                              <1> MemoryModel10:		db	VBE_MEMORYMODEL_DIRECT_COLOR
   855                              <1> BankSize10:		db	0
   856                              <1> NumberOfImagePages10:	db	10
   857                              <1> Reserved_page10:	db	0
   858                              <1> RedMaskSize10:		db	8
   859                              <1> RedFieldPosition10:	db	16
   860                              <1> GreenMaskSize10:	db	8
   861                              <1> GreenFieldPosition10:	db	8
   862                              <1> BlueMaskSize10:		db	8
   863                              <1> BlueFieldPosition10:	db	0
   864                              <1> RsvdMaskSize10:		db	0
   865                              <1> RsvdFieldPosition10:	db	0
   866                              <1> DirectColorModeInfo10:	db	0
   867                              <1> PhysBasePtr10:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
   868                              <1> OffScreenMemOffset10:	dd	0
   869                              <1> OffScreenMemSize10:	dw	0
   870                              <1> LinBytesPerScanLine10:	dw	2400
   871                              <1> BnkNumberOfPages10: 	db	0
   872                              <1> LinNumberOfPages10: 	db	0
   873                              <1> LinRedMaskSize10:	db	8
   874                              <1> LinRedFieldPosition10:	db	16
   875                              <1> LinGreenMaskSize10:	db	8
   876                              <1> LinGreenFieldPosition10:db	8
   877                              <1> LinBlueMaskSize10:	db	8
   878                              <1> LinBlueFieldPosition10:	db	0
   879                              <1> LinRsvdMaskSize10:	db	0
   880                              <1> LinRsvdFieldPosition10:	db	0
   881                              <1> MaxPixelClock10:	dd	0
   882                              <1> 
   883                              <1> 			dw	0117h ; 1024x768x16
   884                              <1> ModeAttributes11: 	dw	MODE_ATTRIBUTES
   885                              <1> WinAAttributes11: 	db	WINA_ATTRIBUTES
   886                              <1> WinBAttributes11: 	db	0
   887                              <1> WinGranularity11: 	dw	VBE_DISPI_BANK_SIZE_KB
   888                              <1> WinSize11: 		dw	VBE_DISPI_BANK_SIZE_KB
   889                              <1> WinASegment11:		dw	VGAMEM_GRAPH
   890                              <1> WinBSegment11:		dw	0000h
   891                              <1> WinFuncPtr11:		dd	0
   892                              <1> BytesPerScanLine11:	dw	2048
   893                              <1> XResolution11:		dw	1024
   894                              <1> YResolution11:		dw	768
   895                              <1> XCharSize11:		db	8
   896                              <1> YCharSize11:		db	16
   897                              <1> NumberOfPlanes11:	db	1
   898                              <1> BitsPerPixel11:		db	16
   899                              <1> NumberOfBanks11:	db	24
   900                              <1> MemoryModel11:		db	VBE_MEMORYMODEL_DIRECT_COLOR
   901                              <1> BankSize11:		db	0
   902                              <1> NumberOfImagePages11:	db	9
   903                              <1> Reserved_page11:	db	0
   904                              <1> RedMaskSize11:		db	5
   905                              <1> RedFieldPosition11:	db	11
   906                              <1> GreenMaskSize11:	db	6
   907                              <1> GreenFieldPosition11:	db	5
   908                              <1> BlueMaskSize11:		db	5
   909                              <1> BlueFieldPosition11:	db	0
   910                              <1> RsvdMaskSize11:		db	0
   911                              <1> RsvdFieldPosition11:	db	0
   912                              <1> DirectColorModeInfo11:	db	0
   913                              <1> PhysBasePtr11:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS,
   914                              <1> OffScreenMemOffset11:	dd	0
   915                              <1> OffScreenMemSize11:	dw	0
   916                              <1> LinBytesPerScanLine11:	dw	2048
   917                              <1> BnkNumberOfPages11: 	db	0
   918                              <1> LinNumberOfPages11: 	db	0
   919                              <1> LinRedMaskSize11:	db	5
   920                              <1> LinRedFieldPosition11:	db	11
   921                              <1> LinGreenMaskSize11:	db	6
   922                              <1> LinGreenFieldPosition11:db	5
   923                              <1> LinBlueMaskSize11:	db	5
   924                              <1> LinBlueFieldPosition11:	db	0
   925                              <1> LinRsvdMaskSize11:	db	0
   926                              <1> LinRsvdFieldPosition11:	db	0
   927                              <1> MaxPixelClock11:	dd	0
   928                              <1> 
   929                              <1> 			dw	0118h ; 1024x768x24
   930                              <1> ModeAttributes12: 	dw	MODE_ATTRIBUTES
   931                              <1> WinAAttributes12: 	db	WINA_ATTRIBUTES
   932                              <1> WinBAttributes12: 	db	0
   933                              <1> WinGranularity12: 	dw	VBE_DISPI_BANK_SIZE_KB
   934                              <1> WinSize12: 		dw	VBE_DISPI_BANK_SIZE_KB
   935                              <1> WinASegment12:		dw	VGAMEM_GRAPH
   936                              <1> WinBSegment12:		dw	0000h
   937                              <1> WinFuncPtr12:		dd	0
   938                              <1> BytesPerScanLine12:	dw	3072
   939                              <1> XResolution12:		dw	1024
   940                              <1> YResolution12:		dw	768
   941                              <1> XCharSize12:		db	8
   942                              <1> YCharSize12:		db	16
   943                              <1> NumberOfPlanes12:	db	1
   944                              <1> BitsPerPixel12:		db	24
   945                              <1> NumberOfBanks12:	db	36
   946                              <1> MemoryModel12:		db	VBE_MEMORYMODEL_DIRECT_COLOR
   947                              <1> BankSize12:		db	0
   948                              <1> NumberOfImagePages12:	db	6
   949                              <1> Reserved_page12:	db	0
   950                              <1> RedMaskSize12:		db	8
   951                              <1> RedFieldPosition12:	db	16
   952                              <1> GreenMaskSize12:	db	8
   953                              <1> GreenFieldPosition12:	db	8
   954                              <1> BlueMaskSize12:		db	8
   955                              <1> BlueFieldPosition12:	db	0
   956                              <1> RsvdMaskSize12:		db	0
   957                              <1> RsvdFieldPosition12:	db	0
   958                              <1> DirectColorModeInfo12:	db	0
   959                              <1> PhysBasePtr12:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
   960                              <1> OffScreenMemOffset12:	dd	0
   961                              <1> OffScreenMemSize12:	dw	0
   962                              <1> LinBytesPerScanLine12:	dw	3072
   963                              <1> BnkNumberOfPages12: 	db	0
   964                              <1> LinNumberOfPages12: 	db	0
   965                              <1> LinRedMaskSize12:	db	8
   966                              <1> LinRedFieldPosition12:	db	16
   967                              <1> LinGreenMaskSize12:	db	8
   968                              <1> LinGreenFieldPosition12:db	8
   969                              <1> LinBlueMaskSize12:	db	8
   970                              <1> LinBlueFieldPosition12:	db	0
   971                              <1> LinRsvdMaskSize12:	db	0
   972                              <1> LinRsvdFieldPosition12:	db	0
   973                              <1> MaxPixelClock12:	dd	0
   974                              <1> 
   975                              <1> 			dw	0140h ; 320x200x32
   976                              <1> ModeAttributes13: 	dw	MODE_ATTRIBUTES
   977                              <1> WinAAttributes13: 	db	WINA_ATTRIBUTES
   978                              <1> WinBAttributes13: 	db	0
   979                              <1> WinGranularity13: 	dw	VBE_DISPI_BANK_SIZE_KB
   980                              <1> WinSize13: 		dw	VBE_DISPI_BANK_SIZE_KB
   981                              <1> WinASegment13:		dw	VGAMEM_GRAPH
   982                              <1> WinBSegment13:		dw	0000h
   983                              <1> WinFuncPtr13:		dd	0
   984                              <1> BytesPerScanLine13:	dw	1280
   985                              <1> XResolution13:		dw	320
   986                              <1> YResolution13:		dw	200
   987                              <1> XCharSize13:		db	8
   988                              <1> YCharSize13:		db	16
   989                              <1> NumberOfPlanes13:	db	1
   990                              <1> BitsPerPixel13:		db	32
   991                              <1> NumberOfBanks13:	db	4
   992                              <1> MemoryModel13:		db	VBE_MEMORYMODEL_DIRECT_COLOR
   993                              <1> BankSize13:		db	0
   994                              <1> NumberOfImagePages13:	db	64
   995                              <1> Reserved_page13:	db	0
   996                              <1> RedMaskSize13:		db	8
   997                              <1> RedFieldPosition13:	db	16
   998                              <1> GreenMaskSize13:	db	8
   999                              <1> GreenFieldPosition13:	db	8
  1000                              <1> BlueMaskSize13:		db	8
  1001                              <1> BlueFieldPosition13:	db	0
  1002                              <1> RsvdMaskSize13:		db	8
  1003                              <1> RsvdFieldPosition13:	db	24
  1004                              <1> DirectColorModeInfo13:	db	VBE_DIRECTCOLOR_RESERVED_BITS_AVAILABLE
  1005                              <1> PhysBasePtr13:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
  1006                              <1> OffScreenMemOffset13:	dd	0
  1007                              <1> OffScreenMemSize13:	dw	0
  1008                              <1> LinBytesPerScanLine13:	dw	1280
  1009                              <1> BnkNumberOfPages13: 	db	0
  1010                              <1> LinNumberOfPages13: 	db	0
  1011                              <1> LinRedMaskSize13:	db	8
  1012                              <1> LinRedFieldPosition13:	db	16
  1013                              <1> LinGreenMaskSize13:	db	8
  1014                              <1> LinGreenFieldPosition13:db	8
  1015                              <1> LinBlueMaskSize13:	db	8
  1016                              <1> LinBlueFieldPosition13:	db	0
  1017                              <1> LinRsvdMaskSize13:	db	8
  1018                              <1> LinRsvdFieldPosition13:	db	24
  1019                              <1> MaxPixelClock13:	dd	0
  1020                              <1> 
  1021                              <1> 			dw	0141h ; 640x400x32
  1022                              <1> ModeAttributes14: 	dw	MODE_ATTRIBUTES
  1023                              <1> WinAAttributes14: 	db	WINA_ATTRIBUTES
  1024                              <1> WinBAttributes14: 	db	0
  1025                              <1> WinGranularity14: 	dw	VBE_DISPI_BANK_SIZE_KB
  1026                              <1> WinSize14: 		dw	VBE_DISPI_BANK_SIZE_KB
  1027                              <1> WinASegment14:		dw	VGAMEM_GRAPH
  1028                              <1> WinBSegment14:		dw	0000h
  1029                              <1> WinFuncPtr14:		dd	0
  1030                              <1> BytesPerScanLine14:	dw	2560
  1031                              <1> XResolution14:		dw	640
  1032                              <1> YResolution14:		dw	400
  1033                              <1> XCharSize14:		db	8
  1034                              <1> YCharSize14:		db	16
  1035                              <1> NumberOfPlanes14:	db	1
  1036                              <1> BitsPerPixel14:		db	32
  1037                              <1> NumberOfBanks14:	db	16
  1038                              <1> MemoryModel14:		db	VBE_MEMORYMODEL_DIRECT_COLOR
  1039                              <1> BankSize14:		db	0
  1040                              <1> NumberOfImagePages14:	db	15
  1041                              <1> Reserved_page14:	db	0
  1042                              <1> RedMaskSize14:		db	8
  1043                              <1> RedFieldPosition14:	db	16
  1044                              <1> GreenMaskSize14:	db	8
  1045                              <1> GreenFieldPosition14:	db	8
  1046                              <1> BlueMaskSize14:		db	8
  1047                              <1> BlueFieldPosition14:	db	0
  1048                              <1> RsvdMaskSize14:		db	8
  1049                              <1> RsvdFieldPosition14:	db	24
  1050                              <1> DirectColorModeInfo14:	db	VBE_DIRECTCOLOR_RESERVED_BITS_AVAILABLE
  1051                              <1> PhysBasePtr14:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
  1052                              <1> OffScreenMemOffset14:	dd  	0
  1053                              <1> OffScreenMemSize14:	dw	0
  1054                              <1> LinBytesPerScanLine14:	dw	2560
  1055                              <1> BnkNumberOfPages14: 	db	0
  1056                              <1> LinNumberOfPages14: 	db	0
  1057                              <1> LinRedMaskSize14:	db	8
  1058                              <1> LinRedFieldPosition14:	db	16
  1059                              <1> LinGreenMaskSize14:	db	8
  1060                              <1> LinGreenFieldPosition14:db	8
  1061                              <1> LinBlueMaskSize14:	db	8
  1062                              <1> LinBlueFieldPosition14:	db	0
  1063                              <1> LinRsvdMaskSize14:	db	8
  1064                              <1> LinRsvdFieldPosition14:	db	24
  1065                              <1> MaxPixelClock14:	dd	0
  1066                              <1> 
  1067                              <1> 			dw	0142 ; 640x480x32
  1068                              <1> ModeAttributes15: 	dw	MODE_ATTRIBUTES
  1069                              <1> WinAAttributes15: 	db	WINA_ATTRIBUTES
  1070                              <1> WinBAttributes15: 	db	0
  1071                              <1> WinGranularity15: 	dw	VBE_DISPI_BANK_SIZE_KB
  1072                              <1> WinSize15: 		dw	VBE_DISPI_BANK_SIZE_KB
  1073                              <1> WinASegment15:		dw	VGAMEM_GRAPH
  1074                              <1> WinBSegment15:		dw	0000h
  1075                              <1> WinFuncPtr15:		dd	0
  1076                              <1> BytesPerScanLine15:	dw	2560
  1077                              <1> XResolution15:		dw	640
  1078                              <1> YResolution15:		dw	480
  1079                              <1> XCharSize15:		db	8
  1080                              <1> YCharSize15:		db	16
  1081                              <1> NumberOfPlanes15:	db	1
  1082                              <1> BitsPerPixel15:		db	32
  1083                              <1> NumberOfBanks15:	db	19
  1084                              <1> MemoryModel15:		db	VBE_MEMORYMODEL_DIRECT_COLOR
  1085                              <1> BankSize15:		db	0
  1086                              <1> NumberOfImagePages15:	db	12
  1087                              <1> Reserved_page15:	db	0
  1088                              <1> RedMaskSize15:		db	8
  1089                              <1> RedFieldPosition15:	db	16
  1090                              <1> GreenMaskSize15:	db	8
  1091                              <1> GreenFieldPosition15:	db	8
  1092                              <1> BlueMaskSize15:		db	8
  1093                              <1> BlueFieldPosition15:	db	0
  1094                              <1> RsvdMaskSize15:		db	8
  1095                              <1> RsvdFieldPosition15:	db	24
  1096                              <1> DirectColorModeInfo15:	db	VBE_DIRECTCOLOR_RESERVED_BITS_AVAILABLE,
  1097                              <1> PhysBasePtr15:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS,
  1098                              <1> OffScreenMemOffset15:	dd	0
  1099                              <1> OffScreenMemSize15:	dw	0
  1100                              <1> LinBytesPerScanLine15:	dw	2560
  1101                              <1> BnkNumberOfPages15: 	db	0
  1102                              <1> LinNumberOfPages15: 	db	0
  1103                              <1> LinRedMaskSize15:	db	8
  1104                              <1> LinRedFieldPosition15:	db	16
  1105                              <1> LinGreenMaskSize15:	db	8
  1106                              <1> LinGreenFieldPosition15:db	8
  1107                              <1> LinBlueMaskSize15:	db	8
  1108                              <1> LinBlueFieldPosition15:	db	0
  1109                              <1> LinRsvdMaskSize15:	db	8
  1110                              <1> LinRsvdFieldPosition15:	db	24
  1111                              <1> MaxPixelClock15:	dd	0
  1112                              <1> 
  1113                              <1> 			dw	0143h ; 800x600x32
  1114                              <1> ModeAttributes16: 	dw	MODE_ATTRIBUTES
  1115                              <1> WinAAttributes16: 	db	WINA_ATTRIBUTES
  1116                              <1> WinBAttributes16: 	db	0
  1117                              <1> WinGranularity16: 	dw	VBE_DISPI_BANK_SIZE_KB
  1118                              <1> WinSize16: 		dw	VBE_DISPI_BANK_SIZE_KB
  1119                              <1> WinASegment16:		dw	VGAMEM_GRAPH
  1120                              <1> WinBSegment16:		dw	0000h
  1121                              <1> WinFuncPtr16:		dd	0
  1122                              <1> BytesPerScanLine16:	dw	3200
  1123                              <1> XResolution16:		dw	800
  1124                              <1> YResolution16:		dw	600
  1125                              <1> XCharSize16:		db	8
  1126                              <1> YCharSize16:		db	16
  1127                              <1> NumberOfPlanes16:	db	1
  1128                              <1> BitsPerPixel16:		db	32
  1129                              <1> NumberOfBanks16:	db	30
  1130                              <1> MemoryModel16:		db	VBE_MEMORYMODEL_DIRECT_COLOR
  1131                              <1> BankSize16:		db	0
  1132                              <1> NumberOfImagePages16:	db	7
  1133                              <1> Reserved_page16:	db	0
  1134                              <1> RedMaskSize16:		db	8
  1135                              <1> RedFieldPosition16:	db	16
  1136                              <1> GreenMaskSize16:	db	8
  1137                              <1> GreenFieldPosition16:	db	8
  1138                              <1> BlueMaskSize16:		db	8
  1139                              <1> BlueFieldPosition16:	db	0
  1140                              <1> RsvdMaskSize16:		db	8
  1141                              <1> RsvdFieldPosition16:	db	24
  1142                              <1> DirectColorModeInfo16:	db	VBE_DIRECTCOLOR_RESERVED_BITS_AVAILABLE,
  1143                              <1> PhysBasePtr16:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS,
  1144                              <1> OffScreenMemOffset16:	dd	0
  1145                              <1> OffScreenMemSize16:	dw	0
  1146                              <1> LinBytesPerScanLine16:	dw	3200
  1147                              <1> BnkNumberOfPages16: 	db	0
  1148                              <1> LinNumberOfPages16: 	db	0
  1149                              <1> LinRedMaskSize16:	db	8
  1150                              <1> LinRedFieldPosition16:	db	16
  1151                              <1> LinGreenMaskSize16:	db	8
  1152                              <1> LinGreenFieldPosition16:db	8
  1153                              <1> LinBlueMaskSize16:	db	8
  1154                              <1> LinBlueFieldPosition16:	db	0
  1155                              <1> LinRsvdMaskSize16:	db	8
  1156                              <1> LinRsvdFieldPosition16:	db	24
  1157                              <1> MaxPixelClock16:	dd	0
  1158                              <1> 	
  1159                              <1> 			dw	0144h ; 1024x768x32
  1160                              <1> ModeAttributes17: 	dw	MODE_ATTRIBUTES
  1161                              <1> WinAAttributes17: 	db	WINA_ATTRIBUTES
  1162                              <1> WinBAttributes17: 	db	0
  1163                              <1> WinGranularity17: 	dw	VBE_DISPI_BANK_SIZE_KB
  1164                              <1> WinSize17: 		dw	VBE_DISPI_BANK_SIZE_KB
  1165                              <1> WinASegment17:		dw	VGAMEM_GRAPH
  1166                              <1> WinBSegment17:		dw	0000h
  1167                              <1> WinFuncPtr17:		dd	0
  1168                              <1> BytesPerScanLine17:	dw	4096
  1169                              <1> XResolution17:		dw	1024
  1170                              <1> YResolution17:		dw	768
  1171                              <1> XCharSize17:		db	8
  1172                              <1> YCharSize17:		db	16
  1173                              <1> NumberOfPlanes17:	db	1
  1174                              <1> BitsPerPixel17:		db	32
  1175                              <1> NumberOfBanks17:	db	48
  1176                              <1> MemoryModel17:		db	VBE_MEMORYMODEL_DIRECT_COLOR
  1177                              <1> BankSize17:		db	0
  1178                              <1> NumberOfImagePages17:	db	4
  1179                              <1> Reserved_page17:	db	0
  1180                              <1> RedMaskSize17:		db	8
  1181                              <1> RedFieldPosition17:	db	16
  1182                              <1> GreenMaskSize17:	db	8
  1183                              <1> GreenFieldPosition17:	db	8
  1184                              <1> BlueMaskSize17:		db	8
  1185                              <1> BlueFieldPosition17:	db	0
  1186                              <1> RsvdMaskSize17:		db	8
  1187                              <1> RsvdFieldPosition17:	db	24
  1188                              <1> DirectColorModeInfo17:	db	VBE_DIRECTCOLOR_RESERVED_BITS_AVAILABLE
  1189                              <1> PhysBasePtr17:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
  1190                              <1> OffScreenMemOffset17:	dd	0
  1191                              <1> OffScreenMemSize17:	dw	0
  1192                              <1> LinBytesPerScanLine17:	dw	4096
  1193                              <1> BnkNumberOfPages17: 	db	0
  1194                              <1> LinNumberOfPages17: 	db	0
  1195                              <1> LinRedMaskSize17:	db	8
  1196                              <1> LinRedFieldPosition17:	db	16
  1197                              <1> LinGreenMaskSize17:	db	8
  1198                              <1> LinGreenFieldPosition17:db	8
  1199                              <1> LinBlueMaskSize17:	db	8
  1200                              <1> LinBlueFieldPosition17:	db	0
  1201                              <1> LinRsvdMaskSize17:	db	8
  1202                              <1> LinRsvdFieldPosition17:	db	24
  1203                              <1> MaxPixelClock17:	dd	0
  1204                              <1> 	
  1205                              <1> 			dw	0146h ; 320x200x8
  1206                              <1> ModeAttributes18: 	dw	MODE_ATTRIBUTES
  1207                              <1> WinAAttributes18: 	db	WINA_ATTRIBUTES
  1208                              <1> WinBAttributes18: 	db	0
  1209                              <1> WinGranularity18: 	dw	VBE_DISPI_BANK_SIZE_KB
  1210                              <1> WinSize18: 		dw	VBE_DISPI_BANK_SIZE_KB
  1211                              <1> WinASegment18:		dw	VGAMEM_GRAPH
  1212                              <1> WinBSegment18:		dw	0000h
  1213                              <1> WinFuncPtr18:		dd	0
  1214                              <1> BytesPerScanLine18:	dw	320
  1215                              <1> XResolution18:		dw	320
  1216                              <1> YResolution18:		dw	200
  1217                              <1> XCharSize18:		db	8
  1218                              <1> YCharSize18:		db	16
  1219                              <1> NumberOfPlanes18:	db	1
  1220                              <1> BitsPerPixel18:		db	8
  1221                              <1> NumberOfBanks18:	db	1
  1222                              <1> MemoryModel18:		db	VBE_MEMORYMODEL_PACKED_PIXEL
  1223                              <1> BankSize18:		db	0
  1224                              <1> NumberOfImagePages18:	db	255 ; 261 in vbetables.h (03/01/2020) !
  1225                              <1> Reserved_page18:	db	0
  1226                              <1> RedMaskSize18:		db	0
  1227                              <1> RedFieldPosition18:	db	0
  1228                              <1> GreenMaskSize18:	db	0
  1229                              <1> GreenFieldPosition18:	db	0
  1230                              <1> BlueMaskSize18:		db	0
  1231                              <1> BlueFieldPosition18:	db	0
  1232                              <1> RsvdMaskSize18:		db	0
  1233                              <1> RsvdFieldPosition18:	db	0
  1234                              <1> DirectColorModeInfo18:	db	0
  1235                              <1> PhysBasePtr18:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
  1236                              <1> OffScreenMemOffset18:	dd	0
  1237                              <1> OffScreenMemSize18:	dw	0
  1238                              <1> LinBytesPerScanLine18:	dw	320
  1239                              <1> BnkNumberOfPages18: 	db	0
  1240                              <1> LinNumberOfPages18: 	db	0
  1241                              <1> LinRedMaskSize18:	db	0
  1242                              <1> LinRedFieldPosition18: 	db	0
  1243                              <1> LinGreenMaskSize18: 	db	0
  1244                              <1> LinGreenFieldPosition18:db	0
  1245                              <1> LinBlueMaskSize18: 	db	0
  1246                              <1> LinBlueFieldPosition18: db	0
  1247                              <1> LinRsvdMaskSize18: 	db	0
  1248                              <1> LinRsvdFieldPosition18: db	0
  1249                              <1> MaxPixelClock18:	dd	0
  1250                              <1> 
  1251                              <1> 			dw	018Dh ; 1280x720x16
  1252                              <1> ModeAttributes19: 	dw	MODE_ATTRIBUTES
  1253                              <1> WinAAttributes19: 	db	WINA_ATTRIBUTES
  1254                              <1> WinBAttributes19: 	db	0
  1255                              <1> WinGranularity19: 	dw	VBE_DISPI_BANK_SIZE_KB
  1256                              <1> WinSize19: 		dw	VBE_DISPI_BANK_SIZE_KB
  1257                              <1> WinASegment19:		dw	VGAMEM_GRAPH
  1258                              <1> WinBSegment19:		dw	0000h
  1259                              <1> WinFuncPtr19:		dd	0
  1260                              <1> BytesPerScanLine19:	dw	2560
  1261                              <1> XResolution19:		dw	1280
  1262                              <1> YResolution19:		dw	720
  1263                              <1> XCharSize19:		db	8
  1264                              <1> YCharSize19:		db	16
  1265                              <1> NumberOfPlanes19:	db	1
  1266                              <1> BitsPerPixel19:		db	16
  1267                              <1> NumberOfBanks19:	db	29
  1268                              <1> MemoryModel19:		db	VBE_MEMORYMODEL_DIRECT_COLOR
  1269                              <1> BankSize19:		db	0
  1270                              <1> NumberOfImagePages19:	db	8
  1271                              <1> Reserved_page19:	db	0
  1272                              <1> RedMaskSize19:		db	5
  1273                              <1> RedFieldPosition19:	db	11
  1274                              <1> GreenMaskSize19:	db	6
  1275                              <1> GreenFieldPosition19:	db	5
  1276                              <1> BlueMaskSize19:		db	5
  1277                              <1> BlueFieldPosition19:	db	0
  1278                              <1> RsvdMaskSize19:		db	0
  1279                              <1> RsvdFieldPosition19:	db	0
  1280                              <1> DirectColorModeInfo19:	db	0
  1281                              <1> PhysBasePtr19:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
  1282                              <1> OffScreenMemOffset19:	dd	0
  1283                              <1> OffScreenMemSize19:	dw	0
  1284                              <1> LinBytesPerScanLine19:	dw	2560
  1285                              <1> BnkNumberOfPages19: 	db	0
  1286                              <1> LinNumberOfPages19: 	db	0
  1287                              <1> LinRedMaskSize19:	db	5
  1288                              <1> LinRedFieldPosition19:	db	11
  1289                              <1> LinGreenMaskSize19:	db	6
  1290                              <1> LinGreenFieldPosition19:db	5
  1291                              <1> LinBlueMaskSize19:	db	5
  1292                              <1> LinBlueFieldPosition19:	db	0
  1293                              <1> LinRsvdMaskSize19:	db	0
  1294                              <1> LinRsvdFieldPosition19:	db	0
  1295                              <1> MaxPixelClock19:	dd	0
  1296                              <1> 
  1297                              <1> 			dw	018Eh ; 1280x720x24
  1298                              <1> ModeAttributes20: 	dw	MODE_ATTRIBUTES
  1299                              <1> WinAAttributes20: 	db	WINA_ATTRIBUTES
  1300                              <1> WinBAttributes20: 	db	0
  1301                              <1> WinGranularity20: 	dw	VBE_DISPI_BANK_SIZE_KB
  1302                              <1> WinSize20: 		dw	VBE_DISPI_BANK_SIZE_KB
  1303                              <1> WinASegment20:		dw	VGAMEM_GRAPH
  1304                              <1> WinBSegment20:		dw	0000h
  1305                              <1> WinFuncPtr20:		dd	0
  1306                              <1> BytesPerScanLine20:	dw	3840
  1307                              <1> XResolution20:		dw	1280
  1308                              <1> YResolution20:		dw	720
  1309                              <1> XCharSize20:		db	8
  1310                              <1> YCharSize20:		db	16
  1311                              <1> NumberOfPlanes20:	db	1
  1312                              <1> BitsPerPixel20:		db	24
  1313                              <1> NumberOfBanks20:	db	43
  1314                              <1> MemoryModel20:		db	VBE_MEMORYMODEL_DIRECT_COLOR
  1315                              <1> BankSize20:		db	0
  1316                              <1> NumberOfImagePages20:	db	5
  1317                              <1> Reserved_page20:	db	0
  1318                              <1> RedMaskSize20:		db	8
  1319                              <1> RedFieldPosition20:	db	16
  1320                              <1> GreenMaskSize20:	db	8
  1321                              <1> GreenFieldPosition20:	db	8
  1322                              <1> BlueMaskSize20:		db	8
  1323                              <1> BlueFieldPosition20:	db	0
  1324                              <1> RsvdMaskSize20:		db	0
  1325                              <1> RsvdFieldPosition20:	db	0
  1326                              <1> DirectColorModeInfo20:	db	0
  1327                              <1> PhysBasePtr20:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
  1328                              <1> OffScreenMemOffset20:	dd	0
  1329                              <1> OffScreenMemSize20:	dw	0
  1330                              <1> LinBytesPerScanLine20:	dw	3840
  1331                              <1> BnkNumberOfPages20: 	db	0
  1332                              <1> LinNumberOfPages20: 	db	0
  1333                              <1> LinRedMaskSize20:	db	8
  1334                              <1> LinRedFieldPosition20:	db	16
  1335                              <1> LinGreenMaskSize20:	db	8
  1336                              <1> LinGreenFieldPosition20:db	8
  1337                              <1> LinBlueMaskSize20:	db	8
  1338                              <1> LinBlueFieldPosition20:	db	0
  1339                              <1> LinRsvdMaskSize20:	db	0
  1340                              <1> LinRsvdFieldPosition20:	db	0
  1341                              <1> MaxPixelClock20:	dd	0
  1342                              <1> 	
  1343                              <1> 			dw	018Fh ; 1280x720x32
  1344                              <1> ModeAttributes21: 	dw	MODE_ATTRIBUTES
  1345                              <1> WinAAttributes21: 	db	WINA_ATTRIBUTES
  1346                              <1> WinBAttributes21: 	db	0
  1347                              <1> WinGranularity21: 	dw	VBE_DISPI_BANK_SIZE_KB
  1348                              <1> WinSize21: 		dw	VBE_DISPI_BANK_SIZE_KB
  1349                              <1> WinASegment21:		dw	VGAMEM_GRAPH
  1350                              <1> WinBSegment21:		dw	0000h
  1351                              <1> WinFuncPtr21:		dd	0
  1352                              <1> BytesPerScanLine21:	dw	5120
  1353                              <1> XResolution21:		dw	1280
  1354                              <1> YResolution21:		dw	720
  1355                              <1> XCharSize21:		db	8
  1356                              <1> YCharSize21:		db	16
  1357                              <1> NumberOfPlanes21:	db	1
  1358                              <1> BitsPerPixel21:		db	32
  1359                              <1> NumberOfBanks21:	db	57
  1360                              <1> MemoryModel21:		db	VBE_MEMORYMODEL_DIRECT_COLOR
  1361                              <1> BankSize21:		db	0
  1362                              <1> NumberOfImagePages21:	db	3
  1363                              <1> Reserved_page21:	db	0
  1364                              <1> RedMaskSize21:		db	8
  1365                              <1> RedFieldPosition21:	db	16
  1366                              <1> GreenMaskSize21:	db	8
  1367                              <1> GreenFieldPosition21:	db	8
  1368                              <1> BlueMaskSize21:		db	8
  1369                              <1> BlueFieldPosition21:	db	0
  1370                              <1> RsvdMaskSize21:		db	8
  1371                              <1> RsvdFieldPosition21:	db	24
  1372                              <1> DirectColorModeInfo21:	db	VBE_DIRECTCOLOR_RESERVED_BITS_AVAILABLE
  1373                              <1> PhysBasePtr21:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
  1374                              <1> OffScreenMemOffset21:	dd	0
  1375                              <1> OffScreenMemSize21:	dw	0
  1376                              <1> LinBytesPerScanLine21:	dw	5120
  1377                              <1> BnkNumberOfPages21: 	db	0
  1378                              <1> LinNumberOfPages21: 	db	0
  1379                              <1> LinRedMaskSize21:	db	8
  1380                              <1> LinRedFieldPosition21:	db	16
  1381                              <1> LinGreenMaskSize21:	db	8
  1382                              <1> LinGreenFieldPosition21:db	8
  1383                              <1> LinBlueMaskSize21:	db	8
  1384                              <1> LinBlueFieldPosition21:	db	0
  1385                              <1> LinRsvdMaskSize21:	db	8
  1386                              <1> LinRsvdFieldPosition21:	db	24
  1387                              <1> MaxPixelClock21:	dd	0
  1388                              <1> 			
  1389                              <1> 			dw	0190h ; 1920x1080x16
  1390                              <1> ModeAttributes22: 	dw	MODE_ATTRIBUTES
  1391                              <1> WinAAttributes22: 	db	WINA_ATTRIBUTES
  1392                              <1> WinBAttributes22: 	db	0
  1393                              <1> WinGranularity22: 	dw	VBE_DISPI_BANK_SIZE_KB
  1394                              <1> WinSize22: 		dw	VBE_DISPI_BANK_SIZE_KB
  1395                              <1> WinASegment22:		dw	VGAMEM_GRAPH
  1396                              <1> WinBSegment22:		dw	0000h
  1397                              <1> WinFuncPtr22:		dd	0
  1398                              <1> BytesPerScanLine22:	dw	3840
  1399                              <1> XResolution22:		dw	1920
  1400                              <1> YResolution22:		dw	1080
  1401                              <1> XCharSize22:		db	8
  1402                              <1> YCharSize22:		db	16
  1403                              <1> NumberOfPlanes22:	db	1
  1404                              <1> BitsPerPixel22:		db	16
  1405                              <1> NumberOfBanks22:	db	64
  1406                              <1> MemoryModel22:		db	VBE_MEMORYMODEL_DIRECT_COLOR,
  1407                              <1> BankSize22:		db	0
  1408                              <1> NumberOfImagePages22:	db	3
  1409                              <1> Reserved_page22:	db	0
  1410                              <1> RedMaskSize22:		db	5
  1411                              <1> RedFieldPosition22:	db	11
  1412                              <1> GreenMaskSize22:	db	6
  1413                              <1> GreenFieldPosition22:	db	5
  1414                              <1> BlueMaskSize22:		db	5
  1415                              <1> BlueFieldPosition22:	db	0
  1416                              <1> RsvdMaskSize22:		db	0
  1417                              <1> RsvdFieldPosition22:	db	0
  1418                              <1> DirectColorModeInfo22:	db	0
  1419                              <1> PhysBasePtr22:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
  1420                              <1> OffScreenMemOffset22:	dd	0
  1421                              <1> OffScreenMemSize22:	dw	0
  1422                              <1> LinBytesPerScanLine22:	dw	3840
  1423                              <1> BnkNumberOfPages22: 	db	0
  1424                              <1> LinNumberOfPages22: 	db	0
  1425                              <1> LinRedMaskSize22:	db	5
  1426                              <1> LinRedFieldPosition22:	db	11
  1427                              <1> LinGreenMaskSize22:	db	6
  1428                              <1> LinGreenFieldPosition22:db	5
  1429                              <1> LinBlueMaskSize22:	db	5
  1430                              <1> LinBlueFieldPosition22:	db	0
  1431                              <1> LinRsvdMaskSize22:	db	0
  1432                              <1> LinRsvdFieldPosition22:	db	0
  1433                              <1> MaxPixelClock22:	dd	0
  1434                              <1> 			
  1435                              <1> 			dw	0191h ; 1920x1080x24
  1436                              <1> ModeAttributes23: 	dw	MODE_ATTRIBUTES
  1437                              <1> WinAAttributes23: 	db	WINA_ATTRIBUTES
  1438                              <1> WinBAttributes23: 	db	0
  1439                              <1> WinGranularity23: 	dw	VBE_DISPI_BANK_SIZE_KB
  1440                              <1> WinSize23: 		dw	VBE_DISPI_BANK_SIZE_KB
  1441                              <1> WinASegment23:		dw	VGAMEM_GRAPH
  1442                              <1> WinBSegment23:		dw	0000h
  1443                              <1> WinFuncPtr23:		dd	0
  1444                              <1> BytesPerScanLine23:	dw	5760
  1445                              <1> XResolution23:		dw	1920
  1446                              <1> YResolution23:		dw	1080
  1447                              <1> XCharSize23:		db	8
  1448                              <1> YCharSize23:		db	16
  1449                              <1> NumberOfPlanes23:	db	1
  1450                              <1> BitsPerPixel23:		db	24
  1451                              <1> NumberOfBanks23:	db	95
  1452                              <1> MemoryModel23:		db	VBE_MEMORYMODEL_DIRECT_COLOR
  1453                              <1> BankSize23:		db	0
  1454                              <1> NumberOfImagePages23:	db	1
  1455                              <1> Reserved_page23:	db	0
  1456                              <1> RedMaskSize23:		db	8
  1457                              <1> RedFieldPosition23:	db	16
  1458                              <1> GreenMaskSize23:	db	8
  1459                              <1> GreenFieldPosition23:	db	8
  1460                              <1> BlueMaskSize23:		db	8
  1461                              <1> BlueFieldPosition23:	db	0
  1462                              <1> RsvdMaskSize23:		db	0
  1463                              <1> RsvdFieldPosition23:	db	0
  1464                              <1> DirectColorModeInfo23:	db	0
  1465                              <1> PhysBasePtr23:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
  1466                              <1> OffScreenMemOffset23:	dd	0
  1467                              <1> OffScreenMemSize23:	dw	0
  1468                              <1> LinBytesPerScanLine23:	dw	5760
  1469                              <1> BnkNumberOfPages23: 	db	0
  1470                              <1> LinNumberOfPages23: 	db	0
  1471                              <1> LinRedMaskSize23:	db	8
  1472                              <1> LinRedFieldPosition23:	db	16
  1473                              <1> LinGreenMaskSize23:	db	8
  1474                              <1> LinGreenFieldPosition23:db	8
  1475                              <1> LinBlueMaskSize23:	db	8
  1476                              <1> LinBlueFieldPosition23:	db	0
  1477                              <1> LinRsvdMaskSize23:	db	0
  1478                              <1> LinRsvdFieldPosition23:	db	0
  1479                              <1> MaxPixelClock23:	dd	0
  1480                              <1> 
  1481                              <1> 			dw	0192h ; 1920x1080x32
  1482                              <1> ModeAttributes24: 	dw	MODE_ATTRIBUTES
  1483                              <1> WinAAttributes24: 	db	WINA_ATTRIBUTES
  1484                              <1> WinBAttributes24: 	db	0
  1485                              <1> WinGranularity24: 	dw	VBE_DISPI_BANK_SIZE_KB
  1486                              <1> WinSize24: 		dw	VBE_DISPI_BANK_SIZE_KB
  1487                              <1> WinASegment24:		dw	VGAMEM_GRAPH
  1488                              <1> WinBSegment24:		dw	0000h
  1489                              <1> WinFuncPtr24:		dd	0
  1490                              <1> BytesPerScanLine24:	dw	7680
  1491                              <1> XResolution24:		dw	1920
  1492                              <1> YResolution24:		dw	1080
  1493                              <1> XCharSize24:		db	8
  1494                              <1> YCharSize24:		db	16
  1495                              <1> NumberOfPlanes24:	db	1
  1496                              <1> BitsPerPixel24:		db	32
  1497                              <1> NumberOfBanks24:	db	127
  1498                              <1> MemoryModel24:		db	VBE_MEMORYMODEL_DIRECT_COLOR
  1499                              <1> BankSize24:		db	0
  1500                              <1> NumberOfImagePages24:	db	1
  1501                              <1> Reserved_page24:	db	0
  1502                              <1> RedMaskSize24:		db	8
  1503                              <1> RedFieldPosition24:	db	16
  1504                              <1> GreenMaskSize24:	db	8
  1505                              <1> GreenFieldPosition24:	db	8
  1506                              <1> BlueMaskSize24:		db	8
  1507                              <1> BlueFieldPosition24:	db	0
  1508                              <1> RsvdMaskSize24:		db	8
  1509                              <1> RsvdFieldPosition24:	db	24
  1510                              <1> DirectColorModeInfo24:	db	VBE_DIRECTCOLOR_RESERVED_BITS_AVAILABLE
  1511                              <1> PhysBasePtr24:		dd	VBE_DISPI_LFB_PHYSICAL_ADDRESS
  1512                              <1> OffScreenMemOffset24:	dd	0
  1513                              <1> OffScreenMemSize24:	dw	0
  1514                              <1> LinBytesPerScanLine24:	dw 	7680
  1515                              <1> BnkNumberOfPages24: 	db	0
  1516                              <1> LinNumberOfPages24: 	db	0
  1517                              <1> LinRedMaskSize24:	db	8
  1518                              <1> LinRedFieldPosition24:	db	16
  1519                              <1> LinGreenMaskSize24:	db	8
  1520                              <1> LinGreenFieldPosition24:db	8
  1521                              <1> LinBlueMaskSize24:	db	8
  1522                              <1> LinBlueFieldPosition24:	db	0
  1523                              <1> LinRsvdMaskSize24:	db	8
  1524                              <1> LinRsvdFieldPosition24:	db	24
  1525                              <1> MaxPixelClock24:	dd	0
  1526                              <1> 
  1527                              <1> VBE_VESA_MODE_END_OF_LIST: dw	0
  1528                              <1> 
  1529                              <1> %endif
  1530                              <1> 
  1531                              <1> ; 24/11/2020
  1532                              <1> 
  1533                              <1> direct_color_fields:
  1534                              <1> 	; 24/11/2020
  1535                              <1> 
  1536                              <1> ; (vbetables-gen.c)
  1537                              <1> ; // Direct Color fields 
  1538                              <1> ; (required for direct/6 and YUV/7 memory models)
  1539                              <1> ; switch(pm->depth) {
  1540                              <1>     
  1541                              <1> ;case 8:
  1542 00007406 00                  <1> r_size_8:  db 0
  1543 00007407 00                  <1> r_pos_8:   db 0
  1544 00007408 00                  <1> g_size_8:  db 0
  1545 00007409 00                  <1> g_pos_8:   db 0
  1546 0000740A 00                  <1> b_size_8:  db 0
  1547 0000740B 00                  <1> b_pos_8:   db 0
  1548 0000740C 00                  <1> a_size_8:  db 0
  1549 0000740D 00                  <1> a_pos_8:   db 0
  1550                              <1> 
  1551                              <1> ;case 16:
  1552 0000740E 05                  <1> r_size_16:  db 5
  1553 0000740F 0B                  <1> r_pos_16:   db 11
  1554 00007410 06                  <1> g_size_16:  db 6
  1555 00007411 05                  <1> g_pos_16:   db 5
  1556 00007412 05                  <1> b_size_16:  db 5
  1557 00007413 00                  <1> b_pos_16:   db 0
  1558 00007414 00                  <1> a_size_16:  db 0
  1559 00007415 00                  <1> a_pos_16:   db 0
  1560                              <1> 
  1561                              <1> ;case 24:
  1562 00007416 08                  <1> r_size_24:  db 8
  1563 00007417 10                  <1> r_pos_24:   db 16
  1564 00007418 08                  <1> g_size_24:  db 8
  1565 00007419 08                  <1> g_pos_24:   db 8
  1566 0000741A 08                  <1> b_size_24:  db 8
  1567 0000741B 00                  <1> b_pos_24:   db 0
  1568 0000741C 00                  <1> a_size_24:  db 0
  1569 0000741D 00                  <1> a_pos_24:   db 0
  1570                              <1> 
  1571                              <1> ;case 32:
  1572 0000741E 08                  <1> r_size_32:  db 8
  1573 0000741F 10                  <1> r_pos_32:   db 16
  1574 00007420 08                  <1> g_size_32:  db 8
  1575 00007421 08                  <1> g_pos_32:   db 8
  1576 00007422 08                  <1> b_size_32:  db 8
  1577 00007423 00                  <1> b_pos_32:   db 0
  1578 00007424 08                  <1> a_size_32:  db 8
  1579 00007425 18                  <1> a_pos_32:   db 24
  3072                                  ;%include 'diskdata.s'	; DISK (BIOS) DATA (initialized)
  3073                                  ;;;
  3074                                  
  3075                                  Align 2
  3076                                  
  3077                                  %include 'sysdefs.s' ; 24/01/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - SYSTEM DEFINITIONS : sysdefs.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 31/12/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    11                              <1> ; sysdefs.inc (14/11/2015)
    12                              <1> ; ****************************************************************************
    13                              <1> 
    14                              <1> ; Retro UNIX 386 v1 Kernel - SYSDEFS.INC
    15                              <1> ; Last Modification: 14/11/2015
    16                              <1> ;
    17                              <1> ; ///////// RETRO UNIX 386 V1 SYSTEM DEFINITIONS ///////////////
    18                              <1> ; (Modified from 
    19                              <1> ;	Retro UNIX 8086 v1 system definitions in 'UNIX.ASM', 01/09/2014)
    20                              <1> ; ((UNIX.ASM (RETRO UNIX 8086 V1 Kernel), 11/03/2013 - 01/09/2014))
    21                              <1> ; 	UNIX.ASM (MASM 6.11) --> SYSDEFS.INC (NASM 2.11)
    22                              <1> ; ----------------------------------------------------------------------------
    23                              <1> ;
    24                              <1> ; Derived from UNIX Operating System (v1.0 for PDP-11) 
    25                              <1> ; (Original) Source Code by Ken Thompson (1971-1972)
    26                              <1> ; <Bell Laboratories (17/3/1972)>
    27                              <1> ; <Preliminary Release of UNIX Implementation Document>
    28                              <1> ;
    29                              <1> ; ****************************************************************************
    30                              <1> 
    31                              <1> nproc 	equ	16  ; number of processes
    32                              <1> nfiles 	equ	50
    33                              <1> ntty	equ     8   ; 8+1 -> 8 (10/05/2013)
    34                              <1> nbuf	equ	4   ; 6 ;; 21/08/2015 - 'namei' buffer problem when nbuf > 4 	
    35                              <1> 		; NOTE: If fd0 super block buffer addres is beyond of the 1st
    36                              <1> 		; 32K, DMA r/w routine or someting else causes a jump to 
    37                              <1> 		; kernel panic routine (in 'alloc' routine, in u5.s)
    38                              <1> 		; because of invalid buffer content (r/w error). 
    39                              <1> 		; When all buffers are set before the end of the 1st 32k,
    40                              <1> 		; there is no problem!? (14/11/2015) 
    41                              <1> 
    42                              <1> ;csgmnt	equ	2000h	; 26/05/2013 (segment of process 1)
    43                              <1> ;core	equ 	0  	    ; 19/04/2013	
    44                              <1> ;ecore	equ	32768 - 64  ; 04/06/2013 (24/05/2013)
    45                              <1> 	; (if total size of argument list and arguments is 128 bytes)
    46                              <1> 	; maximum executable file size = 32768-(64+40+128-6) = 32530 bytes
    47                              <1> 	; maximum stack size = 40 bytes (+6 bytes for 'IRET' at 32570)	
    48                              <1> 	; initial value of user's stack pointer = 32768-64-128-2 = 32574
    49                              <1> 	; 	(sp=32768-args_space-2 at the beginning of execution)
    50                              <1> 	; argument list offset = 32768-64-128 = 32576 (if it is 128 bytes)
    51                              <1> 	; 'u' structure offset (for the '/core' dump file) = 32704
    52                              <1> 	; '/core' dump file size = 32768 bytes
    53                              <1>  
    54                              <1> ; 08/03/2014 
    55                              <1> ;sdsegmnt equ	6C0h  ; 256*16 bytes (swap data segment size for 16 processes)		 	 
    56                              <1> ; 19/04/2013 Retro UNIX 8086 v1 feaure only !
    57                              <1> ;;sdsegmnt equ 	740h  ; swap data segment (for user structures and registers)
    58                              <1> 
    59                              <1> ; 30/08/2013
    60                              <1> time_count equ 4 ; 10 --> 4 01/02/2014
    61                              <1> 
    62                              <1> ; 05/02/2014
    63                              <1> ; process status
    64                              <1> ;SFREE 	equ 0
    65                              <1> ;SRUN	equ 1
    66                              <1> ;SWAIT	equ 2
    67                              <1> ;SZOMB	equ 3
    68                              <1> ;SSLEEP	equ 4 ; Retro UNIX 8086 V1 extension (for sleep and wakeup)
    69                              <1> 
    70                              <1> ; 09/03/2015
    71                              <1> userdata equ 80000h ; user structure data address for current user ; temporary
    72                              <1> swap_queue equ 90000h - 2000h ; swap queue address ; temporary
    73                              <1> swap_alloc_table equ 0D0000h  ;  swap allocation table address ; temporary
    74                              <1> 
    75                              <1> ; 17/09/2015
    76                              <1> ESPACE equ 48 ; [u.usp] (at 'sysent') - [u.sp] value for error return
    77                              <1> 
    78                              <1> ; 31/12/2017
    79                              <1> ; 19/02/2017
    80                              <1> ; 15/10/2016
    81                              <1> ; 20/05/2016
    82                              <1> ; 19/05/2016
    83                              <1> ; 18/05/2016
    84                              <1> ; 29/04/2016 
    85                              <1> ; TRDOS 386 (TRDOS v2.0) system calls - temporary List 
    86                              <1> ; 14/07/2013 - 21/09/2015 (Retro UNIX 8086 & 386 system calls) 
    87                              <1> _ver 	equ 0 ; Get TRDOS version (v2.0)
    88                              <1> _exit 	equ 1
    89                              <1> _fork 	equ 2
    90                              <1> _read 	equ 3
    91                              <1> _write	equ 4
    92                              <1> _open	equ 5
    93                              <1> _close 	equ 6
    94                              <1> _wait 	equ 7
    95                              <1> _creat 	equ 8
    96                              <1> _rename	equ 9  ; TRDOS 386, Rename File (31/12/2017)	
    97                              <1> _delete	equ 10 ; TRDOS 386, Delete File (29/12/2017)
    98                              <1> _exec	equ 11
    99                              <1> _chdir	equ 12
   100                              <1> _time 	equ 13 ; TRDOS 386, Get Sys Date&Time (30/12/2017)
   101                              <1> _mkdir 	equ 14
   102                              <1> _chmod	equ 15 ; TRDOS 386, Change Attributes (30/12/2017) 
   103                              <1> _rmdir	equ 16 ; TRDOS 386, Remove Directory (29/12/2017)
   104                              <1> _break	equ 17
   105                              <1> _drive	equ 18 ; TRDOS 386, Get/Set Current Drv (30/12/2017) 
   106                              <1> _seek	equ 19
   107                              <1> _tell 	equ 20
   108                              <1> _mem	equ 21 ; TRDOS 386, Get Total&Free Mem (31/12/2017)
   109                              <1> _prompt	equ 22 ; TRDOS 386, Change Cmd Prompt (31/12/2017)
   110                              <1> _path	equ 23 ; TRDOS 386, Get/Set Run Path (31/12/2017)
   111                              <1> _env	equ 24 ; TRDOS 386, Get/Set Env Vars (31/12/2017)
   112                              <1> _stime	equ 25 ; TRDOS 386, Set Sys Date&Time (30/12/2017)
   113                              <1> _quit	equ 26	
   114                              <1> _intr	equ 27
   115                              <1> _dir	equ 28 ; TRDOS 386, Get Curr Drive&Dir (30/12/2017) 
   116                              <1> _emt 	equ 29
   117                              <1> _ldrvt 	equ 30 ; TRDOS 386, Get Logical DOS DDT (30/12/2017)
   118                              <1> _video  equ 31 ; TRDOS 386 Video Functions (16/05/2016)
   119                              <1> _audio	equ 32 ; TRDOS 386 Video Functions (16/05/2016)
   120                              <1> _timer	equ 33 ; TRDOS 386 Timer Functions (18/05/2016)
   121                              <1> _sleep	equ 34 ; Retro UNIX 8086 v1 feature only !
   122                              <1> _msg	equ 35 ; Retro UNIX 386 v1 feature only !
   123                              <1> _geterr	equ 36 ; Retro UNIX 386 v1 feature only !
   124                              <1> _fpsave equ 37 ; TRDOS 386 FPU state option (28/02/2017)
   125                              <1> _pri 	equ 38 ; change priority - TRDOS 386 (20/05/2016)
   126                              <1> _rele	equ 39 ; TRDOS 386 (19/05/2016)
   127                              <1> _fff	equ 40 ; Find First File - TRDOS 386 (15/10/2016)
   128                              <1> _fnf	equ 41 ; Find Next File - TRDOS 386 (15/10/2016)
   129                              <1> _alloc	equ 42 ; Allocate memory - TRDOS 386 (19/02/2017)
   130                              <1> 	       ; TRDOS 386 (19/02/2017) DMA buff fuctions		
   131                              <1> _dalloc equ 43 ; Deallocate mem - TRDOS 386 (19/02/2017)
   132                              <1> _calbac equ 44 ; Set IRQ callback - TRDOS 386 (20/02/2017)  				
   133                              <1> _dma	equ 45 ; DMA service - TRDOS 386 (20/08/2017)  
   134                              <1> 
   135                              <1> %macro sys 1-4
   136                              <1>     ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)	
   137                              <1>     ; 03/09/2015	
   138                              <1>     ; 13/04/2015
   139                              <1>     ; Retro UNIX 386 v1 system call.		
   140                              <1>     %if %0 >= 2   
   141                              <1>         mov ebx, %2
   142                              <1>         %if %0 >= 3    
   143                              <1>             mov ecx, %3
   144                              <1>             %if %0 = 4
   145                              <1>                mov edx, %4   
   146                              <1>             %endif
   147                              <1>         %endif
   148                              <1>     %endif
   149                              <1>     mov eax, %1
   150                              <1>     ;int 30h
   151                              <1>     int 40h ; TRDOS 386 (TRDOS v2.0)		   
   152                              <1> %endmacro
   153                              <1> 
   154                              <1> ; TRDOS 386 system calls, interrupt number
   155                              <1> ; 25/12/2016
   156                              <1> SYSCALL_INT_NUM   equ '40' ; '40h'
   157                              <1> 
   158                              <1> ; 13/05/2015 - ERROR CODES
   159                              <1> ERR_FILE_NOT_OPEN  equ 10 ; 'file not open !' error
   160                              <1> ERR_FILE_ACCESS    equ 11 ; 'permission denied !' error
   161                              <1> ; 14/05/2015
   162                              <1> ERR_DIR_ACCESS     equ 11 ; 'permission denied !' error
   163                              <1> ERR_FILE_NOT_FOUND equ 12 ; 'file not found !' error
   164                              <1> ERR_TOO_MANY_FILES equ 13 ; 'too many open files !' error
   165                              <1> ERR_DIR_EXISTS     equ 14 ; 'directory already exists !' error 	
   166                              <1> ; 16/05/2015		
   167                              <1> ERR_DRV_NOT_RDY    equ 15 ; 'drive not ready !' error
   168                              <1> ; 18/05/2015
   169                              <1> ERR_DEV_NOT_RDY    equ 15 ; 'device not ready !' error
   170                              <1> ERR_DEV_ACCESS     equ 11 ; 'permission denied !' error 
   171                              <1> ERR_DEV_NOT_OPEN   equ 10 ; 'device not open !' error	
   172                              <1> ; 07/06/2015
   173                              <1> ERR_FILE_EOF	   equ 16 ; 'end of file !' error
   174                              <1> ERR_DEV_VOL_SIZE   equ 16 ; 'out of volume !' error
   175                              <1> ; 09/06/2015
   176                              <1> ERR_DRV_READ	   equ 17 ; 'disk read error !'
   177                              <1> ERR_DRV_WRITE	   equ 18 ; 'disk write error !'
   178                              <1> ; 16/06/2015
   179                              <1> ERR_NOT_DIR	   equ 19 ; 'not a (valid) directory !' error
   180                              <1> ERR_FILE_SIZE	   equ 20 ; 'file size error !'	
   181                              <1> ; 22/06/2015
   182                              <1> ERR_NOT_SUPERUSER  equ 11 ; 'permission denied !' error
   183                              <1> ERR_NOT_OWNER      equ 11 ; 'permission denied !' error
   184                              <1> ERR_NOT_FILE       equ 11 ; 'permission denied !' error	
   185                              <1> ; 23/06/2015
   186                              <1> ERR_FILE_EXISTS    equ 14 ; 'file already exists !' error
   187                              <1> ERR_DRV_NOT_SAME   equ 21 ; 'not same drive !' error
   188                              <1> ERR_DIR_NOT_FOUND  equ 12 ; 'directory not found !' error
   189                              <1> ERR_NOT_EXECUTABLE equ 22 ; 'not executable file !' error
   190                              <1> ; 27/06/2015
   191                              <1> ERR_INV_PARAMETER  equ 23 ; 'invalid parameter !' error
   192                              <1> ERR_INV_DEV_NAME   equ 24 ; 'invalid device name !' error
   193                              <1> ; 29/06/2015
   194                              <1> ERR_TIME_OUT	   equ 25 ; 'time out !' error			
   195                              <1> ERR_DEV_NOT_RESP   equ 25 ; 'device not responding !' error
   196                              <1> ; 10/10/2016
   197                              <1> ERR_INV_FILE_NAME  equ 26 ; 'invalid file name !' error
   198                              <1> ERR_INV_FLAGS	   equ 23 ; 'invalid flags !' error
   199                              <1> ; For code compatibility with previous version of TRDOS (2011)
   200                              <1> ; (Temporary error codes for current TRDOS 386 -2016- version) 
   201                              <1> ERR_NO_MORE_FILES  equ 12 ; 'no more files !' error
   202                              <1> ERR_PATH_NOT_FOUND equ  3 ; 'path not found !' error 
   203                              <1> 			  ; 'dir not found !' ; TRDOS 8086
   204                              <1> ERR_NOT_FOUND:	   equ  2 ; 'file not found !' ; TRDOS 8086
   205                              <1> ERR_DISK_SPACE	   equ 39 ; 'out of volume !' TRDOS 8086
   206                              <1> 			  ; 'insufficient disk space !' ; 27h
   207                              <1> ERR_DISK_WRITE	   equ 30 ; 'disk write protected !' ; 16/10/2016
   208                              <1> ERR_ACCESS_DENIED  equ  5 ; 'access denied !' ; TRDOS 8086 	
   209                              <1> ; 28/02/2017
   210                              <1> ERR_PERM_DENIED	   equ 11 ; 'permission denied !' error  	
   211                              <1> ; 18/05/2016
   212                              <1> ERR_MISC	   equ 27 ; miscellaneous/other errors
   213                              <1> ; 15/10/2016
   214                              <1> ; TRDOS 8086 -> TRDOS 386 (0Bh -> 28)
   215                              <1> ERR_INV_FORMAT	   equ 28 ; 'invalid format !' error
   216                              <1> ; TRDOS 8086 -> TRDOS 386 (0Dh -> 29)
   217                              <1> ERR_INV_DATA	   equ 29 ; 'invalid data !' error
   218                              <1> ; TRDOS 8086 -> TRDOS 386 (0Eh -> 20)
   219                              <1> ERR_ZERO_LENGTH	   equ 20  ; 'zero length !' error 	
   220                              <1> ; TRDOS 8086 -> TRDOS 386 (15h -> 17, 1Dh -> 18, 1Eh -> 17) 	
   221                              <1> ERR_DRV_NR_READ	   equ 17 ; 'drive not ready or read error !'
   222                              <1> ERR_DRV_NR_WRITE   equ 18 ; 'drive not ready or write error !'		
   223                              <1> ; 15/10/2016
   224                              <1> ERR_INV_PATH_NAME  equ 19 ; 'bad path name !' error
   225                              <1> ERR_BAD_CMD_ARG	   equ  1 ; 'bad command argument !' ; TRDOS 8086
   226                              <1> ERR_INV_FNUMBER	   equ  1 ; 'invalid function number !' ; TRDOS 8086
   227                              <1> ERR_BIG_FILE	   equ  8 ; 'big file & out of memory ! ; TRDOS 8086 	
   228                              <1> ERR_BIG_DATA	   equ  8 ; 'big data & out of memory ! ; TRDOS 8086
   229                              <1> ERR_CLUSTER	   equ 35 ; 'cluster not available !' ; TRDOS 8086
   230                              <1> ERR_OUT_OF_MEMORY  equ  4 ; 'out of memory !'
   231                              <1> 			  ; 'insufficient memory !'
   232                              <1> ERR_P_VIOLATION	   equ	6 ; 'protection violation !'
   233                              <1> ERR_PAGE_FAULT	   equ 224 ;'page fault !' ;0E0h						 
   234                              <1> ERR_SWP_DISK_READ  	   equ 40
   235                              <1> ERR_SWP_DISK_NOT_PRESENT   equ 41
   236                              <1> ERR_SWP_SECTOR_NOT_PRESENT equ 42
   237                              <1> ERR_SWP_NO_FREE_SPACE      equ 43
   238                              <1> ERR_SWP_DISK_WRITE         equ 44
   239                              <1> ERR_SWP_NO_PAGE_TO_SWAP    equ 45
   240                              <1> ; 10/04/2017
   241                              <1> ERR_BUFFER	   equ 46  ; 'buffer error !'
   242                              <1> ; 28/08/2017 (20/08/2017)
   243                              <1> ERR_DMA		   equ -1  ; DMA buffer (allocation/misc.) error!
   244                              <1> 
   245                              <1> ; 26/08/2015
   246                              <1> ; 24/07/2015
   247                              <1> ; 24/06/2015
   248                              <1> MAX_ARG_LEN	   equ 256 ; max. length of sys exec arguments
   249                              <1> ; 01/07/2015
   250                              <1> MAX_MSG_LEN	   equ 255 ; max. msg length for 'sysmsg'
   251                              <1> ;	
   252                              <1> ; 06/10/2016
   253                              <1> OPENFILES	   equ 10  ; max. number of open files (system)
   254                              <1> ; 07/10/2016
   255                              <1> ;NUMOFDEVICES	   equ 20  ; max. num of available devices (sys)
   256                              <1> 			 		
  3078                                  %include 'trdosk0.s' ; 04/01/2016 
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - DEFINITIONS : trdosk0.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 29/02/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 04/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; TRDOS2.ASM (09/11/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; TRDOS2.ASM (c) 2004-2011 Erdogan TAN [ 17/01/2004 ] Last Update: 09/11/2011
    14                              <1> ;
    15                              <1> ; Masterboot / Partition Table at Beginning+1BEh
    16                              <1> ptBootable       equ 0
    17                              <1> ptBeginHead      equ 1
    18                              <1> ptBeginSector    equ 2
    19                              <1> ptBeginCylinder  equ 3
    20                              <1> ptFileSystemID   equ 4
    21                              <1> ptEndHead        equ 5
    22                              <1> ptEndSector      equ 6
    23                              <1> ptEndCylinder    equ 7
    24                              <1> ptStartSector    equ 8
    25                              <1> ptSectors        equ 12
    26                              <1> 
    27                              <1> ; Boot Sector Parameters at 7C00h
    28                              <1> DataArea1     equ -4
    29                              <1> DataArea2     equ -2
    30                              <1> BootStart     equ 0h
    31                              <1> OemName       equ 03h
    32                              <1> BytesPerSec   equ 0Bh
    33                              <1> SecPerClust   equ 0Dh
    34                              <1> ResSectors    equ 0Eh
    35                              <1> FATs          equ 10h
    36                              <1> RootDirEnts   equ 11h
    37                              <1> Sectors       equ 13h
    38                              <1> Media         equ 15h
    39                              <1> FATSecs       equ 16h
    40                              <1> SecPerTrack   equ 18h
    41                              <1> Heads         equ 1Ah 
    42                              <1> Hidden1       equ 1Ch
    43                              <1> Hidden2       equ 1Eh
    44                              <1> HugeSec1      equ 20h
    45                              <1> HugeSec2      equ 22h
    46                              <1> DriveNumber   equ 24h
    47                              <1> Reserved1     equ 25h
    48                              <1> bootsignature equ 26h                 
    49                              <1> VolumeID      equ 27h
    50                              <1> VolumeLabel   equ 2Bh
    51                              <1> FileSysType   equ 36h          
    52                              <1> Reserved2     equ 3Eh                           ; Starting cluster of P2000
    53                              <1> 
    54                              <1> ; FAT32 BPB Structure
    55                              <1> FAT32_FAT_Size equ 36
    56                              <1> FAT32_RootFClust equ 44
    57                              <1> FAT32_FSInfoSec equ 48
    58                              <1> FAT32_DrvNum equ 64
    59                              <1> FAT32_BootSig equ 66
    60                              <1> FAT32_VolID equ 67
    61                              <1> FAT32_VolLab equ 71
    62                              <1> FAT32_FilSysType equ 82
    63                              <1> 
    64                              <1> ; BIOS Disk Parameters
    65                              <1> DPDiskNumber  equ 0h
    66                              <1> DPDType       equ 1h
    67                              <1> DPReturn      equ 2h
    68                              <1> DPHeads       equ 3h
    69                              <1> DPCylinders   equ 4h
    70                              <1> DPSecPerTrack equ 6h
    71                              <1> DPDisks       equ 7h
    72                              <1> DPTableOff    equ 8h
    73                              <1> DPTableSeg    equ 0Ah
    74                              <1> DPNumOfSecs   equ 0Ch
    75                              <1> 
    76                              <1> ; BIOS INT 13h Extensions (LBA extensions)
    77                              <1> ; Just After DP Data (DPDiskNumber+)
    78                              <1> DAP_PacketSize equ 10h  ; If extensions present, this byte will be >=10h
    79                              <1> DAP_Reserved1 equ 11h   ; Reserved Byte 
    80                              <1> DAP_NumOfBlocks equ 12h ; Value of this byte must be 0 to 127
    81                              <1> DAP_Reserved2 equ 13h   ; Reserved Byte
    82                              <1> DAP_Destination equ 14h ; Address of Transfer Buffer as SEGMENT:OFFSET
    83                              <1> DAP_LBA_Address equ 18h ; LBA=(C1*H0+H1)*S0+S1-1
    84                              <1>                         ; C1= Selected Cylinder Number
    85                              <1>                         ; H0= Number Of Heads (Maximum Head Number + 1)
    86                              <1>                         ; H1= Selected Head Number
    87                              <1>                         ; S0= Maximum Sector Number
    88                              <1>                         ; S1= Selected Sector Number
    89                              <1>                         ; QUAD WORD
    90                              <1> ; DAP_Flat_Destination equ 20h ; 64 bit address, if value in 4h is FFFF:FFFFh
    91                              <1>                              ; QUAD WORD (Also, value in 0h must be 18h) 
    92                              <1>                              ; TR-DOS will not use 64 bit Flat Address
    93                              <1> 
    94                              <1> ; INT 13h Function 48h "Get Enhanced Disk Drive Parameters"
    95                              <1> ; Just After DP Data (DPDiskNumber+)
    96                              <1> GetDParams_48h equ 20h ; Word. Data Length, must be 26 (1Ah) for short data.
    97                              <1> GDP_48h_InfoFlag equ 22h ; Word
    98                              <1> ; Bit 1 = 1 -> The geometry returned in bytes 4-15 is valid.
    99                              <1> GDP_48h_NumOfPCyls equ 24h ; Double Word. Number physical cylinders.
   100                              <1> GDP_48h_NumOfPHeads equ 28h ; Double Word. Number of physical heads.
   101                              <1> GDP_48h_NumOfPSpT equ 2Ch ; Double word. Num of physical sectors per track.
   102                              <1> GDP_48h_LBA_Sectors equ 30h ; 8 bytes. Number of physical/LBA sectors.
   103                              <1> GDP_48h_BytesPerSec equ 38h ; Word. Number of bytes in a sector.
   104                              <1> 
   105                              <1> ; TR-DOS Standalone Program Extensions to the DiskParams Block
   106                              <1> ; Just After DP Data (DPDiskNumber+)
   107                              <1> TRDP_CurrentSector equ 3Ah  ; DX:AX (LBA)
   108                              <1> TRDP_SectorCount equ 3Eh    ; CX (or Counter)
   109                              <1> 
   110                              <1> 
   111                              <1> ; DOS Logical Disks
   112                              <1> LD_Name equ 0
   113                              <1> LD_DiskType equ 1
   114                              <1> LD_PhyDrvNo equ 2
   115                              <1> LD_FATType equ 3
   116                              <1> LD_FSType equ 4
   117                              <1> LD_LBAYes equ 5
   118                              <1> LD_BPB equ 6
   119                              <1> LD_FATBegin equ 96
   120                              <1> LD_ROOTBegin equ 100
   121                              <1> LD_DATABegin equ 104
   122                              <1> LD_StartSector equ 108
   123                              <1> LD_TotalSectors equ 112
   124                              <1> LD_FreeSectors equ 116
   125                              <1> LD_Clusters equ 120
   126                              <1> LD_PartitionEntry equ 124
   127                              <1> LD_DParamEntry equ 125
   128                              <1> LD_MediaChanged equ 126
   129                              <1> LD_CDirLevel equ 127
   130                              <1> LD_CurrentDirectory equ 128
   131                              <1> 
   132                              <1> ; Singlix FS Extensions to DOS Logical Disks
   133                              <1> ; 03/01/2010 (LD_BPB compatibility for CHS r/w)
   134                              <1> 
   135                              <1> LD_FS_Name equ 0
   136                              <1> LD_FS_DiskType equ 1
   137                              <1> LD_FS_PhyDrvNo equ 2
   138                              <1> LD_FS_FATType equ 3
   139                              <1> LD_FS_FSType equ 4
   140                              <1> LD_FS_LBAYes equ 5
   141                              <1> LD_FS_BPB equ 6
   142                              <1> LD_FS_MediaAttrib equ 6
   143                              <1> LD_FS_VersionMajor equ 7
   144                              <1> LD_FS_RootDirD equ 8
   145                              <1> LD_FS_MATLocation equ 12
   146                              <1> LD_FS_Reserved1 equ 16 ;1 reserved byte
   147                              <1> LD_FS_BytesPerSec equ 17 ; LD_BPB + 0Bh
   148                              <1> LD_FS_Reserved2 equ 19 ;2 reserved byte
   149                              <1> LD_FS_DATLocation equ 20
   150                              <1> LD_FS_DATSectors equ 24
   151                              <1> LD_FS_Reserved3 equ 28 ;3 reserved word
   152                              <1> LD_FS_SecPerTrack equ 30 ; LD_BPB + 18h
   153                              <1> LD_FS_NumHeads equ 32    ; LD_BPB + 1Ah
   154                              <1> LD_FS_UnDelDirD equ 34
   155                              <1> LD_FS_Reserved4 equ 38 ;4 reserved word
   156                              <1> LD_FS_VolumeSerial equ 40
   157                              <1> LD_FS_VolumeName equ 44
   158                              <1> LD_FS_BeginSector equ 108
   159                              <1> LD_FS_VolumeSize equ 112
   160                              <1> LD_FS_FreeSectors equ 116
   161                              <1> LD_FS_FirstFreeSector equ 120
   162                              <1> LD_FS_PartitionEntry equ 124
   163                              <1> LD_FS_DParamEntry equ 125
   164                              <1> LD_FS_MediaChanged equ 126
   165                              <1> LD_FS_CDirLevel equ 127
   166                              <1> LD_FS_CDIR_Converted equ 128
   167                              <1> 
   168                              <1> ; Valid FAT Types
   169                              <1> FS_FAT12 equ 1
   170                              <1> FS_FAT16_CHS equ 2
   171                              <1> FS_FAT32_CHS equ 3
   172                              <1> FS_FAT16_LBA equ 4
   173                              <1> FS_FAT32_LBA equ 5
   174                              <1> 
   175                              <1> ; Cursor Location
   176                              <1> CCCpointer equ  0450h   ; BIOS data, current cursor column
   177                              <1> ; FAT Clusters EOC sign
   178                              <1> FAT12EOC equ 0FFFh
   179                              <1> FAT16EOC equ 0FFFFh
   180                              <1> ;FAT32EOC equ 0FFFFFFFh ; It is not direct usable for 8086 code
   181                              <1> ; BAD Cluster
   182                              <1> FAT12BADC equ 0FF7h
   183                              <1> FAT16BADC equ 0FFF7h
   184                              <1> ;FAT32BADC equ 0FFFFFF7h ; It is not direct usable for 8086 code
   185                              <1> ; MS-DOS FAT16 FS (Maximum Possible) Last Cluster Number= 0FFF6h 
   186                              <1> 
   187                              <1> ; TRFS
   188                              <1> 
   189                              <1> bs_FS_JmpBoot equ 0 ; jmp short bsBootCode
   190                              <1>                 ; db 0EBh, db 3Fh, db 90h
   191                              <1> bs_FS_Identifier equ 3  ; db 'FS', db 0
   192                              <1> bs_FS_BytesPerSec equ 6 ; dw 512
   193                              <1> bs_FS_MediaAttrib equ 8 ; db 3
   194                              <1> bs_FS_PartitionID equ 9 ; db 0A1h
   195                              <1> bs_FS_VersionMaj equ 10 ; db 01h
   196                              <1> bs_FS_VersionMin equ 11 ; db 0
   197                              <1> bs_FS_BeginSector equ 12   ; dd 0 
   198                              <1> bs_FS_VolumeSize equ 16 ; dd 2880
   199                              <1> bs_FS_StartupFD equ 20 ; dd 0
   200                              <1> bs_FS_MATLocation equ 24 ; dd 1
   201                              <1> bs_FS_RootDirD equ 28 ; dd 8
   202                              <1> bs_FS_SystemConfFD equ 32 ; dd 0
   203                              <1> bs_FS_SwapFD equ 36 ; dd 0
   204                              <1> bs_FS_UnDelDirD equ 40 ; dd 0
   205                              <1> bs_FS_DriveNumber equ 44 ; db 0
   206                              <1> bs_FS_LBA_Ready equ 45 ; db 0
   207                              <1> bs_FS_MagicWord equ 46 
   208                              <1> bs_FS_SecPerTrack equ 46 ; db 0A1h
   209                              <1> bs_FS_Heads equ 47 ; db 01h 
   210                              <1> bs_FS_OperationSys equ 48 ; db "TR-SINGLIX v1.0b"
   211                              <1> bs_FS_Terminator equ 64 ; db 0
   212                              <1> bs_FS_BootCode equ 65 
   213                              <1> 
   214                              <1> FS_MAT_DATLocation equ 12
   215                              <1> FS_MAT_DATScount equ 16
   216                              <1> FS_MAT_FreeSectors equ 20
   217                              <1> FS_MAT_FirstFreeSector equ 24
   218                              <1> FS_RDT_VolumeSerialNo equ 28
   219                              <1> FS_RDT_VolumeName equ 64
   220                              <1> 
   221                              <1> ; FAT12 + FAT16 + FAT32
   222                              <1> BS_JmpBoot equ 0
   223                              <1> BS_OEMName equ 3
   224                              <1> BPB_BytsPerSec equ 11
   225                              <1> BPB_SecPerClust equ 13
   226                              <1> BPB_RsvdSecCnt equ 14
   227                              <1> BPB_NumFATs equ 16
   228                              <1> BPB_RootEntCnt equ 17
   229                              <1> BPB_TotalSec16 equ 19
   230                              <1> BPB_Media equ 21
   231                              <1> BPB_FATSz16 equ 22
   232                              <1> BPB_SecPerTrk equ 24
   233                              <1> BPB_NumHeads equ 26
   234                              <1> BPB_HiddSec equ 28
   235                              <1> BPB_TotalSec32 equ 32
   236                              <1> 
   237                              <1> ; FAT12 and FAT16 only
   238                              <1> BS_DrvNum equ 36
   239                              <1> BS_Reserved1 equ 37
   240                              <1> BS_BootSig equ 38
   241                              <1> BS_VolID equ 39
   242                              <1> BS_VolLab equ 43
   243                              <1> BS_FilSysType equ 54 ; 8 bytes
   244                              <1> BS_BootCode equ 62
   245                              <1> 
   246                              <1> ; FAT32 only
   247                              <1> BPB_FATSz32 equ 36 ; FAT32, 4 bytes
   248                              <1> BPB_ExtFlags equ 40 ; FAT32, 2 bytes
   249                              <1> BPB_FSVer equ 42 ; FAT32, 2 bytes
   250                              <1> BPB_RootClus equ 44 ; FAT32, 4 bytes
   251                              <1> BPB_FSInfo equ 48 ; FAT 32, 2 bytes 
   252                              <1> BPB_BkBootSec equ 50 ; FAT32, 2 bytes
   253                              <1> BPB_Reserved equ 52 ; FAT32, 12 bytes
   254                              <1> BS_FAT32_DrvNum equ 64 ; FAT32, 1 byte
   255                              <1> BS_FAT32_Reserved1 equ 65 ; FAT32, 1 byte
   256                              <1> BS_FAT32_BootSig equ 66 ; FAT32, 1 byte
   257                              <1> BS_FAT32_VolID equ 67 ; FAT32, 4 bytes
   258                              <1> BS_FAT32_VolLab equ 71 ; FAT32, 11 bytes
   259                              <1> BS_FAT32_FilSysType equ 82 ; FAT32, 8 bytes
   260                              <1> BS_FAT32_BootCode equ 90
   261                              <1> 
   262                              <1> ; 29/02/2016
   263                              <1> ;(FAT32 Free Cluster Count & First Free Cluster values)
   264                              <1> ;[BPB_Reserved] = Free Cluster Count (offset 52)
   265                              <1> ;[BPB_Reserved+4] = First Free Cluster (offset 56)
   266                              <1> 
   267                              <1> BS_Validation equ 510
   268                              <1> 
   269                              <1> ; 15/02/2016
   270                              <1> ; FILE.ASM - 09/10/2011
   271                              <1> ; Directory Entry Structure
   272                              <1> ; 29/10/2009 (According to Microsoft FAT32 File System Specification)
   273                              <1> DirEntry_Name equ 0
   274                              <1> DirEntry_Attr equ 11
   275                              <1> DirEntry_NTRes equ 12
   276                              <1> DirEntry_CrtTimeTenth equ 13
   277                              <1> DirEntry_CrtTime equ 14
   278                              <1> DirEntry_CrtDate equ 16
   279                              <1> DirEntry_LastAccDate equ 18
   280                              <1> DirEntry_FstClusHI equ 20
   281                              <1> DirEntry_WrtTime equ 22
   282                              <1> DirEntry_WrtDate equ 24
   283                              <1> DirEntry_FstClusLO equ 26
   284                              <1> DirEntry_FileSize equ 28
  3079                                  %include 'trdosk1.s' ; 04/01/2016 
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.3) - SYS INIT : trdosk1.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 06/12/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 04/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.15 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; TRDOS2.ASM (09/11/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; TRDOS2.ASM (c) 2004-2011 Erdogan TAN [ 17/01/2004 ] Last Update: 09/11/2011
    14                              <1> ;
    15                              <1> 
    16                              <1> sys_init:
    17                              <1> 	; 20/01/2018  (v2.0.1)
    18                              <1> 	; 23/01/2017  (v2.0.0)
    19                              <1> 	; 07/05/2016
    20                              <1> 	; 02/05/2016
    21                              <1> 	; 24/04/2016
    22                              <1> 	; 14/04/2016
    23                              <1> 	; 13/04/2016
    24                              <1> 	; 30/03/2016
    25                              <1> 	; 24/01/2016
    26                              <1> 	; 06/01/2016
    27                              <1> 	; 04/01/2016
    28                              <1> 
    29                              <1> 	; 23/01/2017 - reset timer frequency (to 18.2Hz)
    30 00007426 B036                <1> 	mov	al, 00110110b ; 36h
    31 00007428 E643                <1>  	out	43h, al
    32 0000742A 31C0                <1> 	xor	eax, eax  ; sub	al, al ; 0
    33 0000742C E640                <1> 	out	40h, al ; LB
    34 0000742E E640                <1> 	out	40h, al ; HB
    35                              <1>  	; 
    36                              <1> 	; 30/03/2016
    37                              <1> 	; Clear Logical DOS Disk Description Tables Area
    38                              <1> 	;xor	eax, eax
    39 00007430 BF00010900          <1> 	mov	edi, Logical_DOSDisks
    40 00007435 B980060000          <1> 	mov	ecx, 6656/4 ; 26*256 = 6656 bytes
    41 0000743A F3AB                <1> 	rep	stosd ; 1664 times 4 bytes
    42                              <1> 
    43 0000743C B83F3A2F00          <1> 	mov	eax, '?:/'
    44 00007441 A3[57820100]        <1> 	mov	[Current_Dir_Drv], eax
    45                              <1> 
    46                              <1> 	; Logical DRV INIT (only for hard disks)
    47 00007446 E825040000          <1> 	call 	ldrv_init  ; trdosk2.s
    48                              <1> 	
    49                              <1> 	; When floppy_drv_init call is disabled
    50                              <1> 	; media changed sign is needed
    51                              <1> 	; for proper drive initialization
    52                              <1>         
    53 0000744B BE00010900          <1> 	mov 	esi, Logical_DOSDisks
    54 00007450 B001                <1> 	mov 	al, 1 ; Initialization sign (invalid_fd_parameter)
    55 00007452 83C67E              <1> 	add 	esi, LD_MediaChanged ; Media Change Status = 1 (init needed)
    56 00007455 8806                <1> 	mov 	[esi], al ; A:
    57 00007457 81C600010000        <1> 	add 	esi, 100h 
    58 0000745D 8806                <1> 	mov 	[esi], al ; B: 
    59                              <1>            
    60                              <1> _current_drive_bootdisk:
    61 0000745F 8A15[EA6D0000]      <1> 	mov 	dl, [boot_drv] ; physical drive number
    62 00007465 80FAFF              <1> 	cmp 	dl, 0FFh
    63 00007468 740A                <1> 	je 	short _last_dos_diskno_check
    64                              <1> _boot_drive_check:
    65 0000746A 80FA80              <1> 	cmp 	dl, 80h
    66 0000746D 7218                <1> 	jb 	short _current_drive_a
    67 0000746F 80EA7E              <1> 	sub 	dl, 7Eh ; C = 2 , D = 3
    68 00007472 EB13                <1> 	jmp 	short _current_drive_a 
    69                              <1> 
    70                              <1> _last_dos_diskno_check:
    71 00007474 8A15[22380100]      <1> 	mov 	dl, [Last_DOS_DiskNo]
    72 0000747A 80FA02              <1> 	cmp 	dl, 2
    73 0000747D 7706                <1> 	ja 	short _current_drive_c
    74 0000747F 7406                <1> 	je 	short _current_drive_a
    75 00007481 30D2                <1> 	xor 	dl, dl ; A:
    76 00007483 EB02                <1> 	jmp 	short _current_drive_a
    77                              <1> 
    78                              <1> _current_drive_c:
    79 00007485 B202                <1> 	mov 	dl, 2 ; C:
    80                              <1> 
    81                              <1> _current_drive_a:
    82 00007487 8815[EB6D0000]      <1> 	mov	[drv], dl
    83 0000748D BE[24380100]        <1>         mov     esi, msg_CRLF_temp
    84 00007492 E8AE000000          <1> 	call 	print_msg
    85                              <1> 
    86 00007497 8A15[EB6D0000]      <1> 	mov	dl, [drv]
    87                              <1> _default_drive_c:
    88 0000749D E82C0C0000          <1> 	call 	change_current_drive
    89 000074A2 731C                <1> 	jnc 	short _start_mainprog
    90                              <1> 
    91                              <1> _drv_not_ready_error: 
    92 000074A4 BE[DF3A0100]        <1> 	mov 	esi, msgl_drv_not_ready
    93 000074A9 E897000000          <1> 	call 	print_msg
    94                              <1>         ;jmp	_end_of_mainprog
    95                              <1> 
    96                              <1> 	; 20/01/2018
    97 000074AE B202                <1> 	mov	dl, 2
    98 000074B0 3815[EB6D0000]      <1> 	cmp	[drv], dl
    99 000074B6 736B                <1> 	jnb	short _end_of_mainprog
   100 000074B8 8815[EB6D0000]      <1> 	mov	[drv], dl
   101 000074BE EBDD                <1> 	jmp	short _default_drive_c
   102                              <1> 
   103                              <1> _start_mainprog:
   104                              <1> 	; 07/01/2017
   105                              <1> 	; 07/05/2016
   106                              <1> 	; 02/05/2016
   107                              <1> 	; 24/04/2016
   108                              <1> 	; Retro UNIX 386 v1, 'sys_init' (u0.s)
   109                              <1> 	; 23/06/2015
   110                              <1> 
   111                              <1> 	; 02/05/2016
   112                              <1> 	; 24/04/2016
   113 000074C0 66B80100            <1> 	mov	ax, 1
   114 000074C4 A2[B3030300]        <1> 	mov	[u.uno], al
   115 000074C9 66A3[4E030300]      <1> 	mov	[mpid], ax
   116 000074CF 66A3[20000300]      <1> 	mov	[p.pid], ax
   117 000074D5 A2[B0000300]        <1> 	mov	[p.stat], al
   118 000074DA C605[A8030300]04    <1> 	mov	byte [u.quant], time_count  ; 07/01/2017
   119                              <1> 	;
   120 000074E1 A1[90810100]        <1> 	mov	eax, [k_page_dir]
   121 000074E6 A3[B8030300]        <1> 	mov	[u.pgdir], eax ; reset
   122                              <1> 	;
   123 000074EB E8D9E6FFFF          <1> 	call	allocate_page
   124 000074F0 0F82B5000000        <1> 	jc	panic
   125 000074F6 A3[B4030300]        <1> 	mov	[u.upage], eax ; user structure page	
   126 000074FB A3[C0000300]        <1> 	mov	[p.upage], eax
   127 00007500 E83EE7FFFF          <1> 	call	clear_page
   128                              <1> 	;
   129                              <1> 	; 24/08/2015
   130 00007505 FE0D[5B030300]      <1> 	dec 	byte [sysflg] ; FFh = ready for system call
   131                              <1> 			      ; 0 = executing a system call
   132                              <1> 	; 13/04/2016
   133                              <1> 	; Clear Environment Variables Page/Area
   134 0000750B BF00300900          <1> 	mov	edi, Env_Page ; 93000h
   135 00007510 B980000000          <1> 	mov	ecx, Env_Page_Size / 4 	; 512/4  (4096/4)				 	  		 	  
   136 00007515 31C0                <1> 	xor	eax, eax
   137 00007517 F3AB                <1> 	rep	stosd
   138                              <1> 
   139                              <1> 	; 14/04/2016
   140 00007519 E807350000          <1>  	call	mainprog_startup_configuration
   141                              <1> 
   142 0000751E E8EC0C0000          <1>         call    dos_prompt
   143                              <1>               
   144                              <1> _end_of_mainprog:
   145 00007523 BE[24380100]        <1>         mov     esi, msg_CRLF_temp
   146 00007528 E818000000          <1> 	call 	print_msg
   147 0000752D BE[2A380100]        <1> 	mov 	esi, mainprog_Version
   148 00007532 E80E000000          <1> 	call 	print_msg
   149                              <1> 	; 24/01/2016
   150 00007537 28E4                <1> 	sub	ah, ah
   151 00007539 E8A799FFFF          <1> 	call	int16h ; call getch
   152 0000753E E9879EFFFF          <1> 	jmp	cpu_reset
   153                              <1> 
   154 00007543 EBFE                <1> infinitiveloop: jmp short infinitiveloop
   155                              <1> 
   156                              <1> print_msg:
   157                              <1> 	; 13/05/2016
   158                              <1> 	; 04/01/2016
   159                              <1> 	; 01/07/2015
   160                              <1> 	; 13/03/2015 (Retro UNIX 386 v1)
   161                              <1> 	; 07/03/2014 (Retro UNIX 8086 v1)
   162                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, ESI, EDI)
   163                              <1> 	;
   164 00007545 8A3D[BE810100]      <1> 	mov	bh, [ACTIVE_PAGE] ; 04/01/2016 (ptty)
   165                              <1> 	;mov	bl, 07h ; Black background, light gray forecolor
   166                              <1> 
   167 0000754B AC                  <1> 	lodsb
   168                              <1> pmsg1:
   169 0000754C 56                  <1> 	push 	esi
   170                              <1> 	;mov	bh, [ACTIVE_PAGE] ; 04/01/2016 (ptty)
   171 0000754D B307                <1> 	mov	bl, 07h ; Black background, light gray forecolor
   172 0000754F E8A9ADFFFF          <1> 	call 	_write_tty
   173 00007554 5E                  <1> 	pop	esi
   174 00007555 AC                  <1> 	lodsb
   175 00007556 20C0                <1> 	and 	al, al
   176 00007558 75F2                <1> 	jnz 	short pmsg1
   177 0000755A C3                  <1> 	retn
   178                              <1> 
   179                              <1> clear_screen:
   180                              <1> 	; 06/12/2020 
   181                              <1> 	; 03/12/2020 (TRDOS 386 v2.0.3)
   182                              <1> 	; 13/05/2016
   183                              <1> 	; 30/01/2016
   184                              <1> 	; 24/01/2016
   185                              <1> 	; 04/01/2016
   186 0000755B 0FB61D[BE810100]    <1> 	movzx	ebx, byte [ACTIVE_PAGE] ; video page number (0 to 7)
   187 00007562 8AA3[CB6F0000]      <1> 	mov 	ah, [ebx+vmode] ; default = 03h (80x25 text)
   188 00007568 80FC04              <1> 	cmp	ah, 4
   189 0000756B 7205                <1> 	jb	short cls1
   190 0000756D 80FC07              <1> 	cmp	ah, 7
   191 00007570 7530                <1> 	jne	short vga_clear
   192                              <1> cls1:
   193                              <1> 	;mov	bh, bl
   194                              <1> 	;mov	bl, 7
   195 00007572 3A25[BA6F0000]      <1> 	cmp	ah, [CRT_MODE] ; current video mode ? 
   196 00007578 740E                <1> 	je	short cls2 ; yes (current video mode = 3)
   197                              <1> 	;;call	set_mode_3 ; set video mode to 3 (& clear screen)
   198                              <1> 	;;retn
   199                              <1> 	; 06/12/2020
   200 0000757A 803D[1C120300]00    <1> 	cmp	byte [pmi32], 0
   201 00007581 771F                <1> 	ja	short vga_clear 	
   202 00007583 E97FADFFFF          <1> 	jmp	set_mode_3
   203                              <1> cls2:
   204 00007588 88DF                <1> 	mov	bh, bl ; video page (0 to 7)
   205 0000758A B307                <1> 	mov	bl, 07h ; attribute to be used on blanked line
   206 0000758C 28C0                <1> 	sub 	al, al ; 0 =  entire window
   207 0000758E 6631C9              <1> 	xor 	cx, cx
   208 00007591 66BA4F18            <1> 	mov 	dx, 184Fh
   209 00007595 E8A3AAFFFF          <1> 	call	_scroll_up ; 24/01/2016
   210                              <1> 	;
   211                              <1> 	;mov	bh, [ACTIVE_PAGE] ; video page number (0 to 7)
   212 0000759A 6631D2              <1> 	xor 	dx, dx
   213                              <1> 	;call	_set_cpos ; 24/01/2016 
   214                              <1> 	;;retn
   215                              <1> 	; 03/12/2020
   216 0000759D E9F5ADFFFF          <1> 	jmp	_set_cpos ; returns to the caller of this proc
   217                              <1> ;cls3:
   218                              <1> ;	retn
   219                              <1> 	; 06/12/2020
   220                              <1> vga_clear:
   221                              <1> 	; 03/12/2020
   222                              <1> 	; set mode by using _int10h
   223                              <1> 	; (also clears screen)
   224 000075A2 88E0                <1> 	mov	al, ah
   225 000075A4 28E4                <1> 	sub	ah, ah  ; set current video mode
   226                              <1> 	;call	_int10h ; simulates int 10h in TRDOS 386 kernel
   227                              <1> 	;jmp	short cls3
   228 000075A6 E9BEA1FFFF          <1> 	jmp	_int10h ; returns to the caller of this proc
   229                              <1> 
   230                              <1> panic:
   231                              <1> 	; 13/05/2016 (TRDOS 386 = TRDOS v2)
   232                              <1> 	; 13/03/2015 (Retro UNIX 386 v1)
   233                              <1> 	; 07/03/2014 (Retro UNIX 8086 v1)
   234 000075AB BE[E7440100]        <1> 	mov 	esi, panic_msg
   235 000075B0 E890FFFFFF          <1> 	call 	print_msg
   236                              <1> key_to_reboot:
   237                              <1>         ; 24/01/2016
   238 000075B5 28E4                <1>         sub     ah, ah
   239 000075B7 E82999FFFF          <1>         call    int16h ; call   getch
   240                              <1>         ; wait for a character from the current tty
   241                              <1> 	;
   242 000075BC B00A                <1> 	mov	al, 0Ah
   243 000075BE 8A3D[BE810100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
   244 000075C4 B307                <1> 	mov	bl, 07h ; Black background, 
   245                              <1> 			; light gray forecolor
   246 000075C6 E832ADFFFF          <1> 	call 	_write_tty
   247 000075CB E9FA9DFFFF          <1> 	jmp	cpu_reset 
   248                              <1> 
   249                              <1> ctrlbrk:
   250                              <1> 	; 12/11/2015
   251                              <1> 	; 13/03/2015 (Retro UNIX 386 v1)
   252                              <1> 	; 06/12/2013 (Retro UNIX 8086 v1)
   253                              <1> 	;
   254                              <1> 	; INT 1Bh (control+break) handler		
   255                              <1> 	;
   256                              <1>       	; Retro Unix 8086 v1 feature only!
   257                              <1>       	;
   258 000075D0 66833D[AA030300]00  <1> 	cmp 	word [u.intr], 0
   259 000075D8 7645                <1> 	jna 	short cbrk4
   260                              <1> cbrk0:
   261                              <1> 	; 12/11/2015
   262                              <1> 	; 06/12/2013
   263 000075DA 66833D[AC030300]00  <1> 	cmp 	word [u.quit], 0
   264 000075E2 743B                <1> 	jz	short cbrk4
   265                              <1> 	;
   266                              <1> 	; 20/09/2013	
   267 000075E4 6650                <1> 	push 	ax
   268 000075E6 A0[BE810100]        <1> 	mov	al, [ptty]
   269                              <1> 	;
   270                              <1> 	; 12/11/2015
   271                              <1> 	;
   272                              <1> 	; ctrl+break (EOT, CTRL+D) from serial port
   273                              <1> 	; or ctrl+break from console (pseudo) tty
   274                              <1> 	; (!redirection!)
   275                              <1> 	;
   276 000075EB 3C08                <1> 	cmp	al, 8 ; serial port tty nums > 7
   277 000075ED 7211                <1>         jb      short cbrk1 ; console (pseudo) tty
   278                              <1> 	;	
   279                              <1> 	; Serial port interrupt handler sets [ptty]
   280                              <1> 	; to the port's tty number (as temporary).
   281                              <1> 	;
   282                              <1> 	; If active process is using a stdin or 
   283                              <1> 	; stdout redirection (by the shell),
   284                              <1>         ; console tty keyboard must be available
   285                              <1> 	; to terminate running process,
   286                              <1> 	; in order to prevent a deadlock. 
   287                              <1> 	;
   288 000075EF 52                  <1> 	push	edx
   289 000075F0 0FB615[B3030300]    <1> 	movzx	edx, byte [u.uno]
   290 000075F7 3A82[7F000300]      <1> 	cmp     al, [edx+p.ttyc-1] ; console tty (rw)
   291 000075FD 5A                  <1> 	pop	edx
   292 000075FE 7412                <1> 	je	short cbrk2
   293                              <1> cbrk1:
   294 00007600 FEC0                <1> 	inc 	al  ; [u.ttyp] : 1 based tty number
   295                              <1> 	; 06/12/2013
   296 00007602 3A05[94030300]      <1> 	cmp	al, [u.ttyp] ; recent open tty (r)
   297 00007608 7408                <1> 	je	short cbrk2	
   298 0000760A 3A05[95030300]      <1>         cmp     al, [u.ttyp+1] ; recent open tty (w)
   299 00007610 750B                <1> 	jne	short cbrk3	
   300                              <1> cbrk2:
   301                              <1> 	;; 06/12/2013
   302                              <1> 	;mov	ax, [u.quit]
   303                              <1> 	;and	ax, ax
   304                              <1> 	;jz	short cbrk3
   305                              <1> 	;
   306 00007612 6631C0              <1> 	xor	ax, ax ; 0
   307 00007615 6648                <1> 	dec	ax
   308                              <1> 	; 0FFFFh = 'ctrl+brk' keystroke
   309 00007617 66A3[AC030300]      <1> 	mov	[u.quit], ax
   310                              <1> cbrk3:
   311 0000761D 6658                <1> 	pop	ax
   312                              <1> cbrk4:
   313 0000761F C3                  <1> 	retn
   314                              <1> 
   315                              <1> 
   316                              <1> ; 31/12/2017
   317                              <1> ; TRDOS 386 - 30/12/2017
   318                              <1> %define get_rtc_date RTC_40
   319                              <1> %define get_rtc_time RTC_20
   320                              <1> %define	set_rtc_date RTC_50
   321                              <1> %define set_rtc_time RTC_30	
   322                              <1> get_rtc_date_time:
   323                              <1> ; Retro UNIX 8086 v1 - UNIX.ASM (01/09/2014)
   324                              <1> ;epoch:
   325                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0)
   326                              <1> 	; 15/03/2015 (Retro UNIX 386 v1 - 32 bit version)
   327                              <1> 	; 09/04/2013 (Retro UNIX 8086 v1 - UNIX.ASM)
   328                              <1> 	; 'epoch' procedure prototype: 
   329                              <1> 	; 	            UNIXCOPY.ASM, 10/03/2013
   330                              <1> 	; 14/11/2012
   331                              <1> 	; unixboot.asm (boot file configuration)
   332                              <1> 	; version of "epoch" procedure in "unixproc.asm"
   333                              <1> 	; 21/7/2012
   334                              <1> 	; 15/7/2012
   335                              <1> 	; 14/7/2012		
   336                              <1> 	; Erdogan Tan - RETRO UNIX v0.1
   337                              <1> 	; compute current date and time as UNIX Epoch/Time
   338                              <1> 	; UNIX Epoch: seconds since 1/1/1970 00:00:00
   339                              <1> 	;
   340                              <1>         ;  ((Modified registers: EAX, EDX, ECX, EBX))  
   341                              <1> 	;
   342                              <1> 
   343 00007620 E87BF4FFFF          <1> 	call 	get_rtc_time		; Return Current Time
   344 00007625 86E9                <1>         xchg 	ch,cl
   345 00007627 66890D[5E7E0100]    <1>         mov 	[hour], cx
   346 0000762E 86F2                <1>         xchg 	dh,dl
   347 00007630 668915[627E0100]    <1>         mov 	[second], dx
   348                              <1> 	;
   349 00007637 E8D5F4FFFF          <1>         call 	get_rtc_date		; Return Current Date
   350 0000763C 86E9                <1>         xchg 	ch,cl
   351 0000763E 66890D[587E0100]    <1>         mov 	[year], cx
   352 00007645 86F2                <1>         xchg 	dh,dl
   353 00007647 668915[5A7E0100]    <1>         mov 	[month], dx
   354                              <1> 	;
   355 0000764E 66B93030            <1> 	mov 	cx, 3030h
   356                              <1> 	;
   357 00007652 A0[5E7E0100]        <1> 	mov 	al, [hour] ; Hour
   358                              <1>         	; AL <= BCD number)
   359 00007657 D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   360                              <1> 					; AH = AL / 10h
   361                              <1> 					; AL = AL MOD 10h
   362 00007659 D50A                <1>         aad 	; AX= AH*10+AL
   363 0000765B A2[5E7E0100]        <1> 	mov 	[hour], al
   364 00007660 A0[5F7E0100]        <1> 	mov 	al, [hour+1] ; Minute
   365                              <1>         	; AL <= BCD number)
   366 00007665 D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   367                              <1> 					; AH = AL / 10h
   368                              <1> 					; AL = AL MOD 10h
   369 00007667 D50A                <1>         aad 	; AX= AH*10+AL
   370 00007669 A2[607E0100]        <1> 	mov 	[minute], al
   371 0000766E A0[627E0100]        <1> 	mov 	al, [second] ; Second
   372                              <1>         	; AL <= BCD number)
   373 00007673 D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   374                              <1> 					; AH = AL / 10h
   375                              <1> 					; AL = AL MOD 10h
   376 00007675 D50A                <1>         aad 	; AX= AH*10+AL
   377 00007677 A2[627E0100]        <1> 	mov 	[second], al
   378 0000767C 66A1[587E0100]      <1> 	mov 	ax, [year] ; Year (century)
   379 00007682 6650                <1>         push 	ax
   380                              <1> 	   	; AL <= BCD number)
   381 00007684 D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   382                              <1> 					; AH = AL / 10h
   383                              <1> 					; AL = AL MOD 10h
   384 00007686 D50A                <1>         aad 	; AX= AH*10+AL
   385 00007688 B464                <1> 	mov 	ah, 100
   386 0000768A F6E4                <1> 	mul 	ah
   387 0000768C 66A3[587E0100]      <1> 	mov 	[year], ax
   388 00007692 6658                <1> 	pop	ax
   389 00007694 88E0                <1> 	mov	al, ah
   390                              <1>         	; AL <= BCD number)
   391 00007696 D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   392                              <1> 					; AH = AL / 10h
   393                              <1> 					; AL = AL MOD 10h
   394 00007698 D50A                <1>         aad 	; AX= AH*10+AL
   395 0000769A 660105[587E0100]    <1> 	add 	[year], ax
   396 000076A1 A0[5A7E0100]        <1> 	mov 	al, [month] ; Month
   397                              <1>            	; AL <= BCD number)
   398 000076A6 D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   399                              <1> 					; AH = AL / 10h
   400                              <1> 					; AL = AL MOD 10h
   401 000076A8 D50A                <1>         aad 	; AX= AH*10+AL
   402 000076AA A2[5A7E0100]        <1> 	mov 	[month], al	
   403 000076AF A0[5B7E0100]        <1>         mov     al, [month+1]      	; Day
   404                              <1>            	; AL <= BCD number)
   405 000076B4 D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   406                              <1> 					; AH = AL / 10h
   407                              <1> 					; AL = AL MOD 10h
   408 000076B6 D50A                <1>         aad 	; AX= AH*10+AL
   409 000076B8 A2[5C7E0100]        <1>         mov     [day], al
   410                              <1> 	
   411 000076BD C3                  <1> 	retn	; 30/12/2017
   412                              <1> 
   413                              <1> epoch:
   414 000076BE E85DFFFFFF          <1> 	call	get_rtc_date_time ; TRDOS 386 - 30/12/2017
   415                              <1> 
   416                              <1> convert_to_epoch:
   417                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0)
   418                              <1> 	; 15/03/2015 (Retro UNIX 386 v1 - 32 bit modification)
   419                              <1> 	; 09/04/2013 (Retro UNIX 8086 v1)
   420                              <1> 	;
   421                              <1> 	; ((Modified registers: EAX, EDX, EBX)) 
   422                              <1> 	;
   423                              <1> 	; Derived from DALLAS Semiconductor
   424                              <1> 	; Application Note 31 (DS1602/DS1603)
   425                              <1> 	; 6 May 1998
   426 000076C3 29C0                <1> 	sub 	eax, eax
   427 000076C5 66A1[587E0100]      <1> 	mov 	ax, [year]
   428 000076CB 662DB207            <1> 	sub 	ax, 1970
   429 000076CF BA6D010000          <1> 	mov 	edx, 365
   430 000076D4 F7E2                <1> 	mul 	edx
   431 000076D6 31DB                <1> 	xor 	ebx, ebx
   432 000076D8 8A1D[5A7E0100]      <1> 	mov 	bl, [month]
   433 000076DE FECB                <1> 	dec 	bl
   434 000076E0 D0E3                <1> 	shl 	bl, 1
   435                              <1> 	;sub	edx, edx
   436 000076E2 668B93[647E0100]    <1> 	mov 	dx, [EBX+DMonth]
   437 000076E9 8A1D[5C7E0100]      <1>         mov     bl, [day]
   438 000076EF FECB                <1> 	dec 	bl
   439 000076F1 01D0                <1> 	add 	eax, edx
   440 000076F3 01D8                <1> 	add 	eax, ebx
   441                              <1> 			; EAX = days since 1/1/1970
   442 000076F5 668B15[587E0100]    <1> 	mov 	dx, [year]
   443 000076FC 6681EAB107          <1> 	sub 	dx, 1969
   444 00007701 66D1EA              <1> 	shr 	dx, 1
   445 00007704 66D1EA              <1> 	shr 	dx, 1		
   446                              <1> 		; (year-1969)/4
   447 00007707 01D0                <1> 	add 	eax, edx
   448                              <1> 			; + leap days since 1/1/1970
   449 00007709 803D[5A7E0100]02    <1> 	cmp 	byte [month], 2	; if past february
   450 00007710 7610                <1> 	jna 	short cte1
   451 00007712 668B15[587E0100]    <1> 	mov 	dx, [year]
   452 00007719 6683E203            <1> 	and 	dx, 3 ; year mod 4
   453 0000771D 7503                <1> 	jnz 	short cte1		
   454                              <1> 			; and if leap year
   455 0000771F 83C001              <1> 	add 	eax, 1 	; add this year's leap day (february 29)
   456                              <1> cte1: 			; compute seconds since 1/1/1970
   457 00007722 BA18000000          <1> 	mov 	edx, 24
   458 00007727 F7E2                <1> 	mul	edx
   459 00007729 8A15[5E7E0100]      <1> 	mov 	dl, [hour]
   460 0000772F 01D0                <1> 	add 	eax, edx
   461                              <1> 		; EAX = hours since 1/1/1970 00:00:00
   462                              <1> 	;mov	ebx, 60
   463 00007731 B33C                <1> 	mov	bl, 60
   464 00007733 F7E3                <1> 	mul	ebx
   465 00007735 8A15[607E0100]      <1> 	mov 	dl, [minute]
   466 0000773B 01D0                <1> 	add 	eax, edx
   467                              <1> 		; EAX = minutes since 1/1/1970 00:00:00
   468                              <1> 	;mov 	ebx, 60
   469 0000773D F7E3                <1> 	mul	ebx
   470 0000773F 8A15[627E0100]      <1> 	mov 	dl, [second]
   471 00007745 01D0                <1> 	add 	eax, edx
   472                              <1>  		; EAX -> seconds since 1/1/1970 00:00:00
   473 00007747 C3                  <1> 	retn
   474                              <1> 
   475                              <1> ;set_date_time:
   476                              <1> convert_from_epoch:
   477                              <1> 	; 31/12/2017 (v2.0.0)
   478                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0)
   479                              <1> 	; 15/03/2015 (Retro UNIX 386 v1 - 32 bit version)
   480                              <1> 	; 20/06/2013 (Retro UNIX 8086 v1)
   481                              <1> 	; 'convert_from_epoch' procedure prototype: 
   482                              <1> 	; 	            UNIXCOPY.ASM, 10/03/2013
   483                              <1> 	;
   484                              <1> 	; ((Modified registers: EAX, EDX, ECX, EBX))	
   485                              <1> 	;
   486                              <1> 	; Derived from DALLAS Semiconductor
   487                              <1> 	; Application Note 31 (DS1602/DS1603)
   488                              <1> 	; 6 May 1998
   489                              <1> 	;
   490                              <1> 	; INPUT:
   491                              <1> 	; EAX = Unix (Epoch) Time
   492                              <1> 	;
   493 00007748 31D2                <1> 	xor 	edx, edx
   494 0000774A B93C000000          <1> 	mov 	ecx, 60
   495 0000774F F7F1                <1> 	div	ecx
   496                              <1> 	;mov 	[imin], eax   ; whole minutes
   497                              <1> 			  ; since 1/1/1970
   498 00007751 668915[627E0100]    <1> 	mov 	[second], dx  ; leftover seconds
   499 00007758 29D2                <1> 	sub 	edx, edx
   500 0000775A F7F1                <1> 	div	ecx
   501                              <1> 	;mov 	[ihrs], eax   ; whole hours
   502                              <1> 	;		      ; since 1/1/1970
   503 0000775C 668915[607E0100]    <1> 	mov 	[minute], dx  ; leftover minutes
   504 00007763 31D2                <1> 	xor	edx, edx
   505                              <1> 	;mov 	cx, 24
   506 00007765 B118                <1> 	mov 	cl, 24
   507 00007767 F7F1                <1> 	div	ecx
   508                              <1> 	;mov 	[iday], ax   ; whole days
   509                              <1> 			     ; since 1/1/1970
   510 00007769 668915[5E7E0100]    <1> 	mov 	[hour], dx   ; leftover hours
   511 00007770 05DB020000          <1> 	add 	eax, 365+366 ; whole day since
   512                              <1> 			     ; 1/1/1968 	
   513                              <1> 	;mov 	[iday], ax
   514 00007775 50                  <1> 	push 	eax
   515 00007776 29D2                <1> 	sub	edx, edx
   516 00007778 B9B5050000          <1> 	mov 	ecx, (4*365)+1 ; 4 years = 1461 days
   517 0000777D F7F1                <1> 	div	ecx
   518 0000777F 59                  <1> 	pop 	ecx
   519                              <1> 	;mov 	[lday], ax   ; count of quadyrs (4 years)
   520 00007780 6652                <1> 	push 	dx
   521                              <1> 	;mov 	[qday], dx   ; days since quadyr began
   522 00007782 6683FA3C            <1> 	cmp 	dx, 31 + 29  ; if past feb 29 then
   523 00007786 F5                  <1> 	cmc		     ; add this quadyr's leap day
   524 00007787 83D000              <1> 	adc 	eax, 0	     ; to # of qadyrs (leap days)
   525                              <1> 	;mov 	[lday], ax   ; since 1968			  
   526                              <1> 	;mov 	cx, [iday]
   527 0000778A 91                  <1> 	xchg 	ecx, eax     ; ECX = lday, EAX = iday		  
   528 0000778B 29C8                <1> 	sub 	eax, ecx     ; iday - lday
   529 0000778D B96D010000          <1> 	mov 	ecx, 365
   530 00007792 31D2                <1> 	xor	edx, edx
   531                              <1> 	; EAX = iday-lday, EDX = 0
   532 00007794 F7F1                <1> 	div	ecx
   533                              <1> 	;mov 	[iyrs], ax   ; whole years since 1968
   534                              <1> 	;jday = iday - (iyrs*365) - lday
   535                              <1> 	;mov [jday], dx      ; days since 1/1 of current year
   536                              <1> 	;add	eax, 1968
   537 00007796 6605B007            <1> 	add 	ax, 1968     ; compute year
   538 0000779A 66A3[587E0100]      <1> 	mov 	[year], ax
   539 000077A0 6689D1              <1> 	mov 	cx, dx
   540                              <1> 	;mov 	dx, [qday]
   541 000077A3 665A                <1> 	pop 	dx
   542 000077A5 6681FA6D01          <1> 	cmp 	dx, 365	     ; if qday <= 365 and qday >= 60	
   543 000077AA 7709                <1> 	ja 	short cfe1   ; jday = jday +1
   544 000077AC 6683FA3C            <1> 	cmp 	dx, 60       ; if past 2/29 and leap year then
   545 000077B0 F5                  <1>         cmc		     ; add a leap day to the # of whole
   546 000077B1 6683D100            <1> 	adc 	cx, 0        ; days since 1/1 of current year
   547                              <1> cfe1:			
   548                              <1> 	;mov 	[jday], cx
   549 000077B5 66BB0C00            <1> 	mov 	bx, 12       ; estimate month
   550 000077B9 66BA6E01            <1> 	mov 	dx, 366      ; mday, max. days since 1/1 is 365
   551 000077BD 6683E003            <1> 	and 	ax, 11b      ; year mod 4 (and dx, 3) 
   552                              <1> cfe2:	; Month calculation  ; 0 to 11  (11 to 0)	
   553 000077C1 6639D1              <1> 	cmp 	cx, dx       ; mday = # of days passed from 1/1
   554 000077C4 731D                <1> 	jnb 	short cfe3
   555 000077C6 664B                <1> 	dec 	bx           ; month = month - 1
   556 000077C8 66D1E3              <1> 	shl 	bx, 1 
   557 000077CB 668B93[647E0100]    <1> 	mov 	dx, [EBX+DMonth] ; # elapsed days at 1st of month
   558 000077D2 66D1EB              <1> 	shr 	bx, 1        ; bx = month - 1 (0 to 11)
   559 000077D5 6683FB01            <1> 	cmp	bx, 1        ; if month > 2 and year mod 4  = 0	
   560 000077D9 76E6                <1> 	jna 	short cfe2   ; then mday = mday + 1
   561 000077DB 08C0                <1> 	or 	al, al       ; if past 2/29 and leap year then
   562 000077DD 75E2                <1> 	jnz 	short cfe2   ; add leap day (to mday)
   563 000077DF 6642                <1> 	inc 	dx           ; mday = mday + 1
   564 000077E1 EBDE                <1> 	jmp 	short cfe2
   565                              <1> cfe3:
   566 000077E3 6643                <1> 	inc 	bx	     ; -> bx = month, 1 to 12
   567 000077E5 66891D[5A7E0100]    <1> 	mov 	[month], bx
   568 000077EC 6629D1              <1> 	sub 	cx, dx	     ; day = jday - mday + 1	
   569 000077EF 6641                <1> 	inc 	cx 			  
   570 000077F1 66890D[5C7E0100]    <1> 	mov 	[day], cx
   571                              <1> 	
   572                              <1> 	; eax, ebx, ecx, edx is changed at return
   573                              <1> 	; output ->
   574                              <1> 	; [year], [month], [day], [hour], [minute], [second]
   575                              <1> 
   576 000077F8 C3                  <1> 	retn	; 31/12/2017 (TRDOS 386)
   577                              <1> 
   578                              <1> set_rtc_date_time:
   579                              <1> 	; 31/12/2017 (v2.0.0)
   580                              <1> 	; 30/12/2017 (TRDOS 386)
   581                              <1> 	; 15/03/2015 (Retro UNIX 386 v1 - 32 bit version)
   582                              <1> 	; 20/06/2013 (Retro UNIX 8086 v1)
   583 000077F9 E80F000000          <1> 	call	set_date_bcd
   584                              <1> 	; Set real-time clock date
   585 000077FE E83BF3FFFF          <1> 	call	set_rtc_date ; RTC_50
   586                              <1> 	; Set real-time clock time
   587 00007803 E832000000          <1> 	call	set_time_bcd
   588 00007808 E9C2F2FFFF          <1> 	jmp	set_rtc_time ; RTC_30	
   589                              <1> 
   590                              <1> ; 31/12/2017
   591                              <1> set_date_bcd:
   592 0000780D A0[597E0100]        <1>         mov     al, [year+1]
   593 00007812 D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   594 00007814 D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   595                              <1> 			     ; AL = AH * 10h + AL
   596 00007816 88C5                <1> 	mov 	ch, al ; century (BCD)
   597 00007818 A0[587E0100]        <1> 	mov 	al, [year]
   598 0000781D D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   599 0000781F D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   600                              <1> 			     ; AL = AH * 10h + AL
   601 00007821 88C1                <1> 	mov 	cl, al ; year (BCD)
   602 00007823 A0[5A7E0100]        <1>         mov 	al, [month]
   603 00007828 D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   604 0000782A D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   605                              <1> 			     ; AL = AH * 10h + AL
   606 0000782C 88C6                <1> 	mov 	dh, al ; month (BCD)
   607 0000782E A0[5C7E0100]        <1> 	mov 	al, [day]
   608 00007833 D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   609 00007835 D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   610                              <1> 			     ; AL = AH * 10h + AL
   611 00007837 88C6                <1> 	mov 	dh, al ; day (BCD)
   612 00007839 C3                  <1> 	retn	; 30/12/2017
   613                              <1> 
   614                              <1> ; 31/12/2017
   615                              <1> set_time_bcd:
   616                              <1>         ; Read real-time clock time 
   617                              <1> 	; (get day light saving time bit status)
   618 0000783A FA                  <1>  	cli
   619 0000783B E850F4FFFF          <1> 	CALL	UPD_IPR 		; CHECK FOR UPDATE IN PROCESS
   620                              <1> 	; cf = 1 -> al = 0
   621 00007840 7207                <1>         jc      short stime1
   622 00007842 B00B                <1> 	MOV	AL,CMOS_REG_B		; ADDRESS ALARM REGISTER
   623 00007844 E862F4FFFF          <1> 	CALL	CMOS_READ		; READ CURRENT VALUE OF DSE BIT
   624                              <1> stime1:
   625 00007849 FB                  <1> 	sti
   626 0000784A 2401                <1> 	AND	AL,00000001B		; MASK FOR VALID DSE BIT
   627 0000784C 88C2                <1> 	MOV	DL,AL			; SET [DL] TO ZERO FOR NO DSE BIT
   628                              <1> 	; DL = 1 or 0 (day light saving time)
   629                              <1> 	;	
   630 0000784E A0[5E7E0100]        <1> 	mov 	al, [hour]
   631 00007853 D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   632 00007855 D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   633                              <1> 			     ; AL = AH * 10h + AL
   634 00007857 88C5                <1> 	mov 	ch, al ; hour (BCD)
   635 00007859 A0[607E0100]        <1>         mov     al, [minute]
   636 0000785E D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   637 00007860 D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   638                              <1> 			     ; AL = AH * 10h + AL
   639 00007862 88C1                <1> 	mov 	cl, al       ; minute (BCD)
   640 00007864 A0[627E0100]        <1>         mov     al, [second]
   641 00007869 D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   642 0000786B D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   643                              <1> 			     ; AL = AH * 10h + AL
   644 0000786D 88C6                <1> 	mov 	dh, al	     ; second (BCD)
   645 0000786F C3                  <1> 	retn	; 30/12/2017
  3080                                  %include 'trdosk2.s' ; 04/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.2) - DRV INIT : trdosk2.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 30/08/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 04/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.14 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; TRDOS2.ASM (09/11/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; DRV_INIT.ASM (c) 2009-2011 Erdogan TAN  [26/09/2009] Last Update: 07/08/2011
    14                              <1> ;
    15                              <1> 
    16                              <1> ldrv_init: ; Logical Drive Initialization
    17                              <1> 	; 30/08/2020
    18                              <1> 	; 25/08/2020
    19                              <1> 	; 11/08/2020, 13/08/2020
    20                              <1> 	; 17/07/2020, 20/07/2020
    21                              <1> 	; 14/07/2020, 15/07/2020
    22                              <1> 	; 30/01/2018
    23                              <1> 	; 27/12/2017
    24                              <1> 	; 12/02/2016
    25                              <1> 	; 06/01/2016
    26                              <1> 	;  	('diskinit.inc', 'diskio.inc' integration)
    27                              <1> 	; 04/01/2016 (TRDOS 386 = TRDOS v2.0)
    28                              <1> 	; 07/08/2011
    29                              <1> 	; 20/09/2009
    30                              <1> 	; 2005
    31                              <1> 
    32                              <1> 	; 15/07/2020
    33                              <1> 	;movzx	ecx, byte [HF_NUM] ; number of fixed disks
    34                              <1> 	;cmp	cl, 1
    35                              <1> 	;jnb	short load_hd_partition_tables
    36                              <1> 
    37 00007870 A0[2C820100]        <1> 	mov	al, [HF_NUM] ; number of fixed disks
    38 00007875 20C0                <1> 	and 	al, al
    39 00007877 7501                <1> 	jnz	short load_hd_partition_tables
    40                              <1> 
    41                              <1> 	; no any hard disks
    42 00007879 C3                  <1> 	retn			
    43                              <1> 
    44                              <1> load_hd_partition_tables:
    45                              <1> 	;mov	esi, [HDPM_TBL_VEC] ; primary master disk FDPT
    46                              <1> 	; 15/07/2020
    47 0000787A BE[30820100]        <1> 	mov	esi, HDPM_TBL_VEC
    48 0000787F BF[56860100]        <1> 	mov 	edi, PTable_hd0
    49 00007884 B280                <1> 	mov 	dl, 80h
    50                              <1> 	; 15/07/2020
    51 00007886 A2[ED6D0000]        <1> 	mov	[hdc], al
    52                              <1> 	;xor	ecx, ecx ; 0
    53                              <1> load_next_hd_partition_table:
    54                              <1> 	; 20/07/2020
    55 0000788B 31C9                <1> 	xor	ecx, ecx ; 0
    56                              <1> 	;push	ecx
    57 0000788D 57                  <1> 	push	edi ; *
    58                              <1> 	;push	esi ; FDPT (+ DPTE) address
    59                              <1> 	; 15/07/2020
    60 0000788E AD                  <1> 	lodsd
    61 0000788F 56                  <1> 	push	esi ; ** ; next FDPT (+ DPTE) address ptr
    62                              <1> 	
    63                              <1> 	;mov	al, [esi+20] ; DPTE offset 4
    64                              <1> 	;and	al, 40h ;  LBA bit (bit 6)
    65                              <1> 	;;shr	al, 6
    66                              <1> 	;mov 	[HD_LBA_yes], al
    67                              <1> 	
    68                              <1> 	; 15/07/2020
    69 00007890 8A4814              <1> 	mov	cl, [eax+20]
    70 00007893 80E140              <1> 	and	cl, 40h
    71 00007896 880D[5A870100]      <1> 	mov	[HD_LBA_yes], cl
    72                              <1> 	
    73 0000789C E844040000          <1> 	call	load_masterboot
    74                              <1> 	;jc	short pass_pt_this_hard_disk
    75                              <1> 	; 13/08/2020
    76 000078A1 0F828A000000        <1> 	jc	pass_pt_this_hard_disk
    77                              <1> 
    78 000078A7 BB[14860100]        <1> 	mov	ebx, PartitionTable
    79 000078AC 89DE                <1> 	mov	esi, ebx
    80                              <1> 	;mov	ecx, 16
    81 000078AE B110                <1> 	mov	cl, 16
    82 000078B0 F3A5                <1> 	rep 	movsd
    83 000078B2 89DE                <1> 	mov 	esi, ebx 
    84                              <1> 	;mov 	byte [hdc], 4 ; 4 - partition index
    85                              <1> 	; 15/07/2020
    86 000078B4 C605[5B870100]04    <1> 	mov	byte [PP_Counter], 4
    87                              <1> loc_validate_hdp_partition:
    88                              <1> 	;cmp 	byte [esi+ptFileSystemID], 0
    89                              <1> 	;jna	short loc_validate_next_hdp_partition2
    90                              <1> 	; 13/08/2020
    91 000078BB 8A4604              <1> 	mov	al, [esi+ptFileSystemID]
    92 000078BE 20C0                <1> 	and	al, al
    93 000078C0 7457                <1> 	jz	short loc_validate_next_hdp_partition2
    94                              <1> 
    95 000078C2 56                  <1> 	push	esi ; *** ; Masterboot partition table offset
    96 000078C3 52                  <1> 	push	edx ; **** ; dl = Physical drive number
    97                              <1> 
    98                              <1> 	; 13/08/2020
    99 000078C4 3C05                <1> 	cmp	al, 05h  ; Extended partition CHS
   100 000078C6 7404                <1>  	je	short loc_set_ep_counter
   101 000078C8 3C0F                <1> 	cmp	al, 0Fh  ; Extended partition LBA
   102 000078CA 7511                <1>  	jne	short loc_validate_next_hdp_partition0
   103                              <1> 	
   104                              <1> 	;;inc	byte [PP_Counter]
   105                              <1> 	; 15/07/2020
   106                              <1> 	;inc 	byte [EP_Counter] ; disk has valid partition(s)
   107                              <1> 
   108                              <1> loc_set_ep_counter:
   109                              <1> 	; 13/08/2020
   110 000078CC 803D[5C870100]80    <1> 	cmp	byte [EP_Counter], 80h
   111 000078D3 7342                <1> 	jnb	short loc_validate_next_hdp_partition1
   112                              <1> 
   113 000078D5 8815[5C870100]      <1> 	mov	byte [EP_Counter], dl ; disk drv has extd. part.
   114                              <1> 
   115 000078DB EB3A                <1> 	jmp	short loc_validate_next_hdp_partition1
   116                              <1> 
   117                              <1> loc_validate_next_hdp_partition0:
   118 000078DD 31FF                <1> 	xor	edi, edi ; 0  
   119                              <1> 	; Input -> ESI = PartitionTable offset
   120                              <1> 	; DL = Hard disk drive number 
   121                              <1> 	; EDI = 0 -> Primary Partition
   122                              <1> 	; EDI > 0 -> Extended Partition's Start Sector   
   123 000078DF E885010000          <1> 	call 	validate_hd_fat_partition
   124 000078E4 730E                <1> 	jnc 	short loc_set_valid_hdp_partition_entry
   125                              <1> 
   126                              <1> 	;pop	edx
   127                              <1> 	;push	edx
   128 000078E6 8B1424              <1> 	mov	edx, [esp]  ; ****
   129 000078E9 8B742404            <1> 	mov	esi, [esp+4] ; *** ; 30/01/2018
   130 000078ED E8D1020000          <1> 	call	validate_hd_fs_partition
   131 000078F2 7223                <1> 	jc	short loc_validate_next_hdp_partition1
   132                              <1> loc_set_valid_hdp_partition_entry:
   133 000078F4 8A0D[22380100]      <1> 	mov 	cl, [Last_DOS_DiskNo] 
   134 000078FA 80C141              <1> 	add 	cl, 'A'
   135                              <1> 	; ESI = Logical dos drive description table address
   136 000078FD 880E                <1> 	mov	[esi+LD_Name], cl
   137                              <1> 	; 15/07/2020
   138 000078FF 8A4602              <1> 	mov	al, [esi+LD_PhyDrvNo] ; Physical drive number
   139                              <1> 	;mov	al, [esp] ; ****
   140 00007902 2C7F                <1> 	sub	al, 7Fh
   141                              <1> 		; AL = 1 to 4	
   142 00007904 C0E002              <1> 	shl	al, 2 ; AL = 4 to 16
   143                              <1> 
   144 00007907 8A15[5B870100]      <1> 	mov	dl, [PP_Counter]
   145                              <1> 
   146                              <1> 	;sub	al, [PP_Counter]
   147 0000790D 28D0                <1> 	sub	al, dl ; [PP_Counter] ; 4 - partition index
   148                              <1> 
   149                              <1> 	; AL = Partition entry/index, 0 based
   150                              <1> 	;  0 -> hd 0, Partition Table offset = 0
   151                              <1> 	; 15 -> hd 3, Partition Table offset = 3
   152                              <1> 
   153                              <1> 	;mov	[esi+LD_PartitionEntry], al 
   154                              <1> 	
   155                              <1> 	; 15/07/2020
   156 0000790F B404                <1> 	mov	ah, 4
   157                              <1> 	;sub	ah, [PP_Counter]
   158 00007911 28D4                <1> 	sub	ah, dl
   159                              <1> 
   160                              <1> 	; AH = Primary partition index, 0 to 3 ; pt entry
   161                              <1> 	;		(4 to 7 for logical disk partitions)
   162                              <1> 
   163                              <1> 	;mov 	[esi+LD_DParamEntry], ah 
   164 00007913 6689467C            <1> 	mov 	[esi+LD_PartitionEntry], ax
   165                              <1> 
   166                              <1> loc_validate_next_hdp_partition1:
   167 00007917 5A                  <1> 	pop 	edx ; **** ; dl = Physical drive number 
   168 00007918 5E                  <1> 	pop	esi ; *** ; Masterboot partition table offset
   169                              <1> 
   170                              <1> loc_validate_next_hdp_partition2:
   171                              <1> 	; ESI = PartitionTable offset
   172                              <1> 	; DL = Hard/Fixed disk drive number
   173                              <1> 	
   174                              <1> 	;dec	byte [hdc] ; 4 - partition index
   175                              <1> 	;jz	short pass_pt_this_hard_disk
   176                              <1> 	; 15/07/2020
   177 00007919 FE0D[5B870100]      <1> 	dec	byte [PP_Counter] ; 4 - partition index
   178 0000791F 7410                <1> 	jz	short pass_pt_this_hard_disk
   179                              <1> 	
   180 00007921 83C610              <1> 	add	esi, 16 ; 10h
   181 00007924 EB95                <1> 	jmp	short loc_validate_hdp_partition
   182                              <1> 
   183                              <1> loc_not_any_extd_partitions:
   184                              <1> 	; 15/07/2020
   185 00007926 C3                  <1> 	retn	
   186                              <1> 
   187                              <1> loc_next_hd_partition_table:
   188 00007927 FEC2                <1> 	inc	dl
   189                              <1> 	; 15/07/2020
   190                              <1> 	;add	esi, 32 ; next FDPT address
   191 00007929 83C740              <1> 	add	edi, 64 ; next partition table destination
   192 0000792C E95AFFFFFF          <1>         jmp     load_next_hd_partition_table
   193                              <1> 
   194                              <1> pass_pt_this_hard_disk:
   195                              <1> 	;pop	esi ; FDPT (+ DPTE) address
   196                              <1> 	; 15/07/2020
   197 00007931 5E                  <1> 	pop	esi ; ** ; next FDPT (+ DPTE) address ptr
   198 00007932 5F                  <1> 	pop	edi ; * ; Ptable_hd?
   199                              <1> 	;pop	ecx
   200                              <1> 	;loop	loc_next_hd_partition_table
   201 00007933 FE0D[ED6D0000]      <1> 	dec	byte [hdc]
   202 00007939 75EC                <1> 	jnz	short loc_next_hd_partition_table
   203                              <1> 
   204                              <1> 	;cmp	byte [PP_Counter], 1
   205                              <1> 	;jnb	short load_extended_dos_partitions
   206                              <1> 	;; Empty partition table
   207                              <1> 	;retn
   208                              <1> 
   209                              <1> 	; 11/08/2020
   210                              <1> 	; 17/07/2020
   211                              <1> check_extended_partitions:
   212                              <1> 	; 15/07/2020
   213                              <1> 	;cmp	byte [EP_Counter], 0
   214                              <1> 	;jna	short loc_not_any_extd_partitions
   215                              <1> 	; 13/08/2020
   216 0000793B A0[5C870100]        <1> 	mov	al, [EP_Counter] ; 1st disk drv has extd partition
   217 00007940 08C0                <1> 	or	al, al ; 0 ?
   218 00007942 74E2                <1> 	jz	short loc_not_any_extd_partitions
   219                              <1> 
   220                              <1> load_extended_dos_partitions:
   221                              <1> 	;mov	byte [hdc], 80h
   222                              <1> 	; 13/08/2020
   223 00007944 A2[ED6D0000]        <1> 	mov	byte [hdc], al ; 1st disk drv has extd partition
   224                              <1> 	; 25/08/2020
   225 00007949 2C80                <1> 	sub	al, 80h
   226 0000794B 740E                <1> 	jz	short loc_set_ext_ptable_hd0
   227 0000794D C0E006              <1> 	shl	al, 6 ; * 64
   228 00007950 0FB6F0              <1> 	movzx	esi, al
   229 00007953 81C6[56860100]      <1> 	add	esi, PTable_hd0
   230 00007959 EB05                <1> 	jmp 	short next_hd_extd_partition
   231                              <1> 
   232                              <1> 	; 25/08/2020
   233                              <1> loc_set_ext_ptable_hd0:
   234 0000795B BE[56860100]        <1> 	mov	esi, PTable_hd0
   235                              <1> 
   236                              <1> next_hd_extd_partition:
   237                              <1> 	; 17/07/2020
   238                              <1> 	;mov 	byte [EP_Counter], 0 ; Reset for each physical disk
   239                              <1> 	; 13/08/2020
   240                              <1> 	;mov	byte [LD_Counter], 0 ; Reset logical drive index
   241 00007960 66C705[5C870100]00- <1> 	mov 	word [EP_Counter], 0 ; Reset EP index and LD index	
   241 00007968 00                  <1>
   242                              <1> 
   243 00007969 56                  <1> 	push	esi ; **** ; PTable_hd? offset
   244                              <1> 	
   245 0000796A C605[5B870100]04    <1> 	mov 	byte [PP_Counter], 4 
   246                              <1> 				; set for each extd partition table
   247                              <1> 	;;mov	ecx, 4
   248                              <1> 	;mov	cl, 4
   249 00007971 8A15[ED6D0000]      <1> 	mov	dl, [hdc]
   250                              <1> hd_check_fs_id_05h:
   251 00007977 8A4604              <1> 	mov	al, [esi+ptFileSystemID]
   252 0000797A 3C05                <1> 	cmp	al, 05h ; Is it an extended dos partition ?
   253 0000797C 7411                <1> 	je	short loc_set_ep_start_sector ; yes
   254                              <1> hd_check_fs_id_0Fh:
   255 0000797E 3C0F                <1> 	cmp	al, 0Fh ; Is it an extended win4 (LBA mode) partition ?
   256 00007980 740D                <1> 	je	short loc_set_ep_start_sector ; yes
   257                              <1> 
   258                              <1> continue_to_check_ep:
   259                              <1> 	;add	esi, 16
   260                              <1> 	;loop	hd_check_fs_id_05h
   261                              <1> 	; 15/07/2020
   262                              <1> 	;dec	cl
   263                              <1> 	;jz	short continue_check_ep_next_disk
   264 00007982 FE0D[5B870100]      <1> 	dec	byte [PP_Counter] ; 4 --> 0
   265 00007988 742D                <1> 	jz	short continue_check_ep_next_disk
   266 0000798A 83C610              <1> 	add	esi, 16
   267 0000798D EBE8                <1> 	jmp	short hd_check_fs_id_05h
   268                              <1> 
   269                              <1> loc_set_ep_start_sector:
   270                              <1> 	; dl = [hdc] ; Drive number
   271                              <1> 	; 15/07/2020
   272 0000798F 8B4E08              <1> 	mov	ecx, [esi+ptStartSector]
   273                              <1> 	; 30/08/2020
   274 00007992 890D[5E870100]      <1> 	mov	[MBR_EP_StartSector], ecx 
   275                              <1> 	; 20/07/2020
   276                              <1> loc_validate_hde_partition_next:
   277 00007998 890D[62870100]      <1> 	mov	[EP_StartSector], ecx ; Extended partition's start sector
   278 0000799E BB[56840100]        <1>         mov	ebx, MasterBootBuff
   279 000079A3 803D[5A870100]01    <1> 	cmp	byte [HD_LBA_yes], 1 ; LBA ready = Yes
   280 000079AA 7227                <1> 	jb	short loc_hd_load_ep_05h ; cf = 1 ; 20/07/2020 
   281                              <1> 	; 11/08/2020
   282                              <1> 	; (BugFix for extended partition type 05h beyond CHS limit)
   283                              <1> 	; (Infact if extended partition starts at the beyond of CHS limit,
   284                              <1> 	;  it's partition ID must be 0Fh but they/somebodies had used 05h.)
   285                              <1> 	;cmp	al, 05h
   286                              <1> 	;je	short loc_hd_load_ep_05h
   287                              <1> loc_hd_load_ep_0Fh:
   288                              <1> 	; 04/01/2016
   289                              <1> 	;push	ecx
   290                              <1> 	; 15/07/2020
   291                              <1> 	;mov	ecx, [esi+ptStartSector] ; sector number
   292                              <1> 	;mov	ebx, MasterBootBuff ; buffer address
   293                              <1> 	; LBA read/write (with private LBA function) 
   294                              <1> 	;((Retro UNIX 386 v1 - DISK I/O code by Erdogan Tan))
   295                              <1> 	; dl = physical drive number (0,1, 80h, 81h, 82h, 83h)
   296                              <1> 	;mov	ah, 1Bh ; LBA read
   297                              <1> 	;mov	al, 1 ; sector count
   298 000079AC 66B8011B            <1> 	mov	ax, 1B01h
   299 000079B0 E86AD8FFFF          <1> 	call	int13h
   300                              <1> 	;pop	ecx
   301                              <1> 	;jnc	short loc_hd_move_ep_table
   302                              <1> 	; 15/07/2020
   303 000079B5 732E                <1> 	jnc	short loc_validate_hde_partition
   304                              <1> 
   305                              <1> continue_check_ep_next_disk:
   306                              <1> 	; 15/07/2020
   307                              <1> 	;pop	edi ; PTable_ep?
   308 000079B7 5E                  <1> 	pop	esi ; **** ; PTable_hd?
   309 000079B8 A0[2C820100]        <1> 	mov	al, [HF_NUM] ; number of hard disks
   310 000079BD 047F                <1> 	add	al, 7Fh
   311 000079BF 3805[ED6D0000]      <1> 	cmp	[hdc], al
   312 000079C5 730B                <1> 	jnb	short loc_validating_hd_partitions_ok
   313 000079C7 83C640              <1> 	add	esi, 64
   314                              <1> 	; 15/07/2020
   315                              <1> 	;add	edi, 64
   316 000079CA FE05[ED6D0000]      <1> 	inc	byte [hdc]
   317 000079D0 EB8E                <1> 	jmp	short next_hd_extd_partition
   318                              <1> 
   319                              <1> loc_validating_hd_partitions_ok:
   320                              <1> 	; 15/07/2020
   321                              <1> 	;mov	al, [Last_DOS_DiskNo]
   322                              <1> loc_drv_init_retn:
   323 000079D2 C3                  <1> 	retn
   324                              <1> 	
   325                              <1> loc_hd_load_ep_05h:
   326                              <1> 	; 20/07/2020 ('diskio.s', int13h, cf = 1 -> bugfix)
   327                              <1> 	;clc    ; (Bug: int13h would not clear carry flag bit, 
   328                              <1> 	;	; even if there would not be an error)
   329                              <1> 	;	; ((Fix: now, int13h procedure clears carry flag
   330                              <1> 	;	;  at the entrance of it.. 20/07/2020))
   331                              <1> 	; 15/07/2020
   332                              <1> 	;push	ecx 
   333 000079D3 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   334 000079D6 668B4E02            <1>         mov     cx, [esi+ptBeginSector]
   335 000079DA 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   336                              <1> 	;mov	ebx, MasterBootBuff
   337 000079DE E83CD8FFFF          <1> 	call	int13h ; 20/07/2020
   338                              <1> 		       ; 'diskio.s' modification, 'clc'
   339                              <1> 	;pop	ecx  
   340 000079E3 72D2                <1> 	jc	short continue_check_ep_next_disk
   341                              <1> 	; 15/07/2020
   342                              <1> 	;jmp	short loc_validate_hde_partition
   343                              <1> 
   344                              <1> 	; 15/07/2020
   345                              <1> ;loc_hd_move_ep_table:
   346                              <1> 	;;pop	edi
   347                              <1> 	;;push	edi  ; PTable_ep?
   348                              <1> 	;mov	edi, [esp]        
   349                              <1>         ;mov	esi, PartitionTable ; Extended
   350                              <1> 	;mov	ebx, esi
   351                              <1> 	;;mov	ecx, 16
   352                              <1> 	;mov	cl, 16
   353                              <1>        	;rep	movsd
   354                              <1> 	;mov	esi, ebx 
   355                              <1> ;loc_set_hde_sub_partition_count:
   356                              <1> 	;mov	byte [PP_Counter], 4
   357                              <1> 	;mov	byte [EP_Counter], 0
   358                              <1> 
   359                              <1> loc_validate_hde_partition:
   360                              <1> 	; 13/08/2020
   361                              <1> 	; 15/07/2020
   362                              <1> 	;mov	byte [PP_Counter], 4
   363 000079E5 BE[14860100]        <1> 	mov	esi, PartitionTable ; (in MasterBootBuff)
   364                              <1> 	; 13/08/2020
   365                              <1> 	;jmp	short get_minidisk_partition_entry
   366                              <1> 
   367                              <1> ;get_minidisk_partition_entry:
   368                              <1> ;	; 20/07/2020
   369                              <1> ;	cmp	byte [esi+ptFileSystemID], 0
   370                              <1> ;	ja	short loc_validate_minidisk_partition
   371                              <1> ;	; 13/08/2020
   372                              <1> ;	jmp	short continue_check_ep_next_disk
   373                              <1> 
   374                              <1> ;	; 11/08/2020
   375                              <1> ;get_minidisk_partition_entry_next:
   376                              <1> ;	; 13/08/2020
   377                              <1> ;	;dec 	byte [PP_Counter]
   378                              <1> ;	;jz	short continue_check_ep_next_disk
   379                              <1> ;	; 20/07/2020
   380                              <1> ;;get_minidisk_partition_entry_next:
   381                              <1> ;	; 13/08/2020
   382                              <1> ;	cmp	esi, PartitionTable+64 
   383                              <1> ;	jnb	short continue_check_ep_next_disk
   384                              <1> ;	
   385                              <1> ;	add 	esi, 16 ; 10h
   386                              <1> ;	;jmp	short get_minidisk_partition_entry
   387                              <1> 
   388                              <1> 	; 13/08/2020
   389                              <1> get_minidisk_partition_entry:
   390                              <1> 	; 20/07/2020
   391 000079EA 807E0400            <1> 	cmp	byte [esi+ptFileSystemID], 0
   392 000079EE 76C7                <1> 	jna	short continue_check_ep_next_disk ; 13/08/2020
   393                              <1> 
   394                              <1> loc_validate_minidisk_partition:
   395                              <1> 	; 13/08/2020
   396                              <1> 	; 20/07/2020
   397                              <1> 	;push	esi ; *** ; Extended partition table offset
   398                              <1> 
   399                              <1> 	; 13/08/2020
   400 000079F0 FE05[5C870100]      <1> 	inc	byte [EP_Counter] ; current (sub partition) index 
   401                              <1> 				  ; in current extended partition
   402                              <1> 
   403 000079F6 BF[62870100]        <1> 	mov	edi, EP_StartSector
   404                              <1> 
   405                              <1> 	; Input -> ESI = PartitionTable offset
   406                              <1> 	; DL = Hard disk drive number   
   407                              <1> 	; EDI = Extended partition start sector pointer
   408 000079FB E869000000          <1> 	call	validate_hd_fat_partition
   409                              <1> 	;pop	ecx ; *
   410 00007A00 7308                <1> 	jnc	short loc_set_valid_hde_partition_entry
   411                              <1> 			 ; jump down to deep !!!
   412                              <1> 
   413                              <1> 	;pop	esi ; *** ; Extended partition table offset
   414                              <1> 	; 13/08/2020
   415                              <1> 	;mov	esi, PartitionTable
   416                              <1> 
   417                              <1> 	; 11/08/2020
   418                              <1> 	; ESI = Extended partition table offset
   419 00007A02 8A15[ED6D0000]      <1> 	mov	dl, [hdc]
   420                              <1> 
   421                              <1> 	;; DL = Hard disk drive number
   422                              <1> 	;dec	byte [PP_Counter]
   423                              <1> 	;jz	short continue_check_ep_next_disk
   424                              <1> 	;add 	esi, 16 ; 10h
   425                              <1> 	;mov	dl, [hdc]
   426                              <1> 	;jmp	short get_minidisk_partition_entry
   427                              <1> 
   428                              <1> 	; 11/08/2020
   429                              <1> 	;jmp	short get_minidisk_partition_entry_next
   430                              <1> 
   431                              <1> 	; 23/08/2020
   432 00007A08 EB3D                <1> 	jmp	short validate_next_minidisk_partition_ok
   433                              <1> 
   434                              <1> 	; 17/07/2020
   435                              <1> 	;; jumping down to deep levels !!!
   436                              <1> 	; ((That is a pitty microsoft preferred ep table chain
   437                              <1> 	; instead of a single table as mbr partition table!?))
   438                              <1> 
   439                              <1> loc_set_valid_hde_partition_entry:
   440                              <1> 	; 15/07/2020
   441 00007A0A A0[ED6D0000]        <1> 	mov	al, [hdc] ; Hard disk drive number (>=80h)
   442 00007A0F 88C2                <1> 	mov	dl, al ; mov dl, [hdc]
   443 00007A11 2C7F                <1> 	sub	al, 7Fh
   444                              <1> 		    ; 1 to 4	
   445 00007A13 C0E002              <1> 	shl	al, 2 ; 4 to 16
   446 00007A16 2A05[5B870100]      <1> 	sub	al, [PP_Counter] ; al - (4 - partition index)
   447                              <1> 			; (disk number * 4) + partition index
   448                              <1> 	
   449                              <1> 	; AL = Partition entry/index, 0 based
   450                              <1>         ;  0 -> hd 0, Partition Table offset = 0
   451                              <1>         ; 15 -> hd 3, Partition Table offset = 3
   452                              <1> 
   453                              <1> 	;mov	ah, 4 ; Logical dos partition (>= 4)
   454                              <1> 	;add	ah, [EP_Counter]
   455                              <1> 		; Logical disk partition index = 4 to 7
   456                              <1> 		; (Primary disk partition index = 0 to 3)
   457                              <1> 
   458                              <1> 	; 13/08/2020
   459 00007A1C 8A25[5D870100]      <1> 	mov	ah, [LD_Counter] ; Logical drive index number
   460                              <1> 				; (in current extended partition)
   461 00007A22 80C404              <1> 	add	ah, 4 ; 4 to 7
   462                              <1> 	
   463                              <1> 	; 15/07/2020
   464                              <1> 	; CX -> AX
   465                              <1> 	;; 06/01/2016 (TRDOS v2.0)
   466                              <1> 	;; BUGFIX *
   467                              <1> 	;;mov	[esi+LD_PartitionEntry], cl 
   468                              <1> 	;;mov	[esi+LD_DParamEntry], ch 
   469                              <1> 	;mov	[esi+LD_PartitionEntry], cx 
   470 00007A25 6689467C            <1> 	mov	[esi+LD_PartitionEntry], ax 	
   471                              <1> 
   472 00007A29 8A0D[22380100]      <1> 	mov	cl, [Last_DOS_DiskNo] 
   473 00007A2F 80C141              <1> 	add	cl, 'A'
   474 00007A32 880E                <1> 	mov	[esi+LD_Name], cl
   475                              <1> 
   476                              <1> 	; 17/07/2020
   477                              <1> 	;cmp	cl, 'Z'
   478                              <1> 	;jb	short logical_drive_count_ok_for_next
   479                              <1> 	;pop	esi ; ***
   480                              <1> 	;pop	esi ; ****
   481                              <1> 	;retn
   482                              <1> 
   483                              <1> ;logical_drive_count_ok_for_next:
   484                              <1> 
   485                              <1> 	;; 15/07/2020
   486                              <1> 	;inc	byte [EP_Counter]
   487                              <1> 	; 13/08/2020
   488 00007A34 FE05[5D870100]      <1> 	inc	byte [LD_Counter]	
   489                              <1> 
   490                              <1> 	;mov	dl, [hdc]
   491                              <1> 
   492                              <1> 	; 17/07/2020
   493                              <1> 	;; Now, 
   494                              <1> 	;; we are swimming in deep of an extended partition !!!
   495                              <1> 	; (! sub or chained extended partition tables !)
   496                              <1> 	; ((Logical dos partitions in extended partition were called
   497                              <1> 	;  as 'mini disk partition' in msdos 6.0 source code.))
   498                              <1> 
   499                              <1> validate_next_minidisk_partition:
   500                              <1> 	; 13/08/2020
   501                              <1> 	;pop	esi ; *** ; Extended partition table offset
   502                              <1> 
   503                              <1> 	; 17/07/2020
   504                              <1> 	;cmp	byte [EP_Counter], 4
   505                              <1> 	; 13/08/2020
   506 00007A3A 803D[5D870100]04    <1> 	cmp	byte [LD_Counter], 4 ; maximum 4 logical disks
   507                              <1> 				     ; per extended partition
   508 00007A41 0F8370FFFFFF        <1> 	jnb	continue_check_ep_next_disk
   509                              <1> 
   510                              <1> validate_next_minidisk_partition_ok:
   511                              <1> 	; 13/08/2020
   512                              <1> 	;dec	byte [PP_Counter] ; 4 --> 0
   513                              <1> 	;jz	continue_check_ep_next_disk
   514                              <1> 	
   515                              <1> 	;cmp	esi, PartitionTable+64 
   516                              <1> 	;jnb	continue_check_ep_next_disk
   517                              <1> 
   518                              <1> 	;add	esi, 16
   519                              <1> 	; 13/08/2020
   520 00007A47 BE[24860100]        <1> 	mov	esi, PartitionTable+16
   521                              <1> 
   522                              <1> 	; 20/07/2020
   523 00007A4C 8A4604              <1> 	mov	al, [esi+ptFileSystemID]
   524                              <1> 
   525                              <1> 	; 20/07/2020
   526 00007A4F 3C05                <1> 	cmp	al, 05h ; Is it an extended dos partition ?
   527 00007A51 7408                <1> 	je	short loc_minidisk_next_ep_lba_chs ; 17/07/2020
   528 00007A53 3C0F                <1> 	cmp	al, 0Fh ; Is it an extended win4 (LBA mode) partition ?
   529 00007A55 0F855CFFFFFF        <1> 	jne	continue_check_ep_next_disk ; AL must be 0 here
   530                              <1> 					; (when it is not 05h or 0Fh)
   531                              <1> 					; If AL is not ZERO -> EP Bug!
   532                              <1> 					; (!Microsoft DOS convention!)
   533                              <1> loc_minidisk_next_ep_lba_chs:
   534                              <1> 	; 17/07/2020
   535 00007A5B 8B4E08              <1> 	mov	ecx, [esi+ptStartSector] ; relative start sector number
   536                              <1> 	;add	ecx, [EP_StartSector]
   537                              <1> 	; 30/08/2020	
   538 00007A5E 030D[5E870100]      <1> 	add	ecx, [MBR_EP_StartSector] 
   539                              <1> 	; 20/07/2020
   540 00007A64 E92FFFFFFF          <1> 	jmp	loc_validate_hde_partition_next
   541                              <1> 
   542                              <1> validate_hd_fat_partition:
   543                              <1> 	; 17/07/2020
   544                              <1> 	; 15/07/2020
   545                              <1> 	;	(optimization)
   546                              <1> 	; 14/07/2020
   547                              <1> 	;	(fat16 -big- partition search bugfix)
   548                              <1> 	; 27/12/2017
   549                              <1> 	; 12/02/2016
   550                              <1> 	; 07/01/2016 (TRDOS 386 = TRDOS v2.0)
   551                              <1> 	; 07/08/2011
   552                              <1> 	; 23/07/2011
   553                              <1> 	; Input
   554                              <1> 	;   DL = Hard/Fixed Disk Drive Number
   555                              <1> 	;   ESI = PartitionTable offset
   556                              <1> 	;   EDI = Extend. Part. Start Sector Pointer
   557                              <1> 	;   EDI = 0 -> Primary Partition 
   558                              <1> 	;   byte [Last_DOS_DiskNo]
   559                              <1>  	; Output
   560                              <1> 	;  cf=0 -> Validated
   561                              <1> 	;   ESI = Logical dos drv desc. table
   562                              <1> 	;   EBX = FAT boot sector buffer
   563                              <1> 	;   byte [Last_DOS_DiskNo]
   564                              <1> 	;  cf=1 -> Not a valid FAT partition
   565                              <1> 	; EAX, EDX, ECX, EDI -> changed 
   566                              <1> 	
   567                              <1> 	;mov 	esi, PartitionTable
   568 00007A69 8A6604              <1> 	mov 	ah, [esi+ptFileSystemID]
   569 00007A6C B002                <1> 	mov	al, 2 ; 27/12/2017
   570 00007A6E 80FC06              <1> 	cmp 	ah, 06h ; FAT16 CHS partition (>=32MB)
   571                              <1> 	; 12/02/2016
   572                              <1> 	;;jb	short loc_not_a_valid_fat_partition2
   573                              <1>  	;jnb	short vhdp_FAT16_32
   574                              <1> 	; 14/07/2020 (BugFix)
   575 00007A71 7711                <1> 	ja	short vhdp_FAT16_32
   576 00007A73 7425                <1> 	je	short loc_set_valid_hd_partition_params
   577                              <1> 
   578                              <1> vhdp_FAT12_16:
   579                              <1> 	; 27/12/2017
   580 00007A75 FEC8                <1> 	dec	al ; mov al, 1
   581 00007A77 38C4                <1> 	cmp	ah, al ; 1 ; FAT12 partition
   582 00007A79 741F                <1> 	je	short loc_set_valid_hd_partition_params
   583                              <1> 	;
   584 00007A7B FEC0                <1> 	inc	al ; mov al, 2
   585 00007A7D 80FC04              <1> 	cmp	ah, 04h ; FAT16 CHS partition (< 32MB)
   586 00007A80 7418                <1> 	je	short loc_set_valid_hd_partition_params
   587                              <1> 	
   588                              <1> 	; 15/07/2020
   589                              <1> 	; (ah = 05h, 02h or 03h)
   590                              <1> loc_not_a_valid_fat_partition1:
   591 00007A82 F9                  <1> 	stc
   592                              <1> 	; cf=1
   593 00007A83 C3                  <1> 	retn
   594                              <1> 
   595                              <1> vhdp_FAT16_32:
   596                              <1> 	; 15/07/2020
   597                              <1> 	;mov	al, 3
   598 00007A84 FEC0                <1> 	inc	al
   599 00007A86 80FC0C              <1> 	cmp	ah, 0Ch ; FAT32 LBA partition
   600 00007A89 740F                <1> 	je	short loc_set_valid_hd_partition_params
   601 00007A8B 7706                <1> 	ja	short vhdp_check_FAT16_lba
   602                              <1> 
   603                              <1> vhdp_check_FAT32_chs:
   604 00007A8D 80FC0B              <1> 	cmp	ah, 0Bh ; FAT32 CHS partition 
   605 00007A90 7408                <1> 	je	short loc_set_valid_hd_partition_params
   606                              <1> 	;jne	short loc_not_a_valid_fat_partition1
   607                              <1> 
   608                              <1> 	;stc
   609                              <1> loc_not_a_valid_fat_partition2:
   610 00007A92 C3                  <1> 	retn
   611                              <1> 
   612                              <1> vhdp_check_FAT16_lba:
   613 00007A93 80FC0E              <1> 	cmp	ah, 0Eh ; FAT16 LBA partition
   614 00007A96 75EA                <1> 	jne	short loc_not_a_valid_fat_partition1
   615                              <1> 
   616                              <1> 	;mov	al, 2
   617 00007A98 FEC8                <1> 	dec	al
   618                              <1> 
   619                              <1> loc_set_valid_hd_partition_params:
   620                              <1> 	; 15/07/2020
   621                              <1> 	;inc 	byte [Last_DOS_DiskNo] ; > 1
   622                              <1> 	;
   623 00007A9A 31DB                <1> 	xor	ebx, ebx
   624 00007A9C 8A3D[22380100]      <1> 	mov	bh, [Last_DOS_DiskNo] ; * 256	
   625 00007AA2 FEC7                <1> 	inc	bh ; 15/07/2020
   626 00007AA4 81C300010900        <1> 	add	ebx, Logical_DOSDisks
   627                              <1> 	;
   628 00007AAA C6430102            <1> 	mov	byte [ebx+LD_DiskType], 2
   629 00007AAE 885302              <1> 	mov	byte [ebx+LD_PhyDrvNo], dl
   630                              <1> 	;mov	byte [ebx+LD_FATType], al ; 2 or 3
   631                              <1> 	;mov	byte [ebx+LD_FSType], ah ; 06h, 0Eh, 0Bh, 0Ch
   632 00007AB1 66894303            <1> 	mov	word [ebx+LD_FATType], ax
   633                              <1> 	;
   634 00007AB5 8B4E08              <1> 	mov	ecx, [esi+ptStartSector]
   635 00007AB8 09FF                <1> 	or	edi, edi 
   636 00007ABA 7402                <1> 	jz	short pass_hd_FAT_ep_start_sector_adding
   637                              <1> loc_add_hd_FAT_ep_start_sector:
   638                              <1> 	; 17/07/2020
   639 00007ABC 030F                <1> 	add	ecx, [edi]
   640                              <1> pass_hd_FAT_ep_start_sector_adding:
   641 00007ABE 894B6C              <1> 	mov	[ebx+LD_StartSector], ecx
   642                              <1> loc_hd_FAT_logical_drv_init:
   643 00007AC1 89DD                <1> 	mov	ebp, ebx
   644                              <1> 	;mov	dl, [ebx+LD_PhyDrvNo]
   645 00007AC3 A0[5A870100]        <1> 	mov	al, [HD_LBA_yes] ; 07/01/2016
   646 00007AC8 884305              <1> 	mov	[ebx+LD_LBAYes], al
   647 00007ACB BB[66870100]        <1> 	mov	ebx, DOSBootSectorBuff ; buffer address
   648 00007AD0 08C0                <1> 	or	al, al
   649 00007AD2 740C                <1> 	jz	short loc_hd_FAT_drv_init_load_bs_chs
   650                              <1> loc_hd_FAT_drv_init_load_bs_lba:
   651                              <1> 	; DL = Physical drive number
   652                              <1>    	;mov	ecx, [esi+ptStartSector] ; sector number
   653                              <1> 	;mov	ebx, DOSBootSectorBuff ; buffer address
   654                              <1> 	; LBA read/write (with private LBA function) 
   655                              <1> 	;((Retro UNIX 386 v1 - DISK I/O code by Erdogan Tan))
   656                              <1> 	; dl = physical drive number (0,1, 80h, 81h, 82h, 83h)
   657 00007AD4 B41B                <1> 	mov	ah, 1Bh ; LBA read
   658 00007AD6 B001                <1> 	mov	al, 1 ; sector count
   659 00007AD8 E842D7FFFF          <1> 	call	int13h
   660 00007ADD 7313                <1> 	jnc	short loc_hd_drv_FAT_boot_validation
   661                              <1> loc_not_a_valid_fat_partition3:
   662 00007ADF C3                  <1> 	retn
   663                              <1> loc_hd_FAT_drv_init_load_bs_chs:
   664 00007AE0 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   665 00007AE3 668B4E02            <1> 	mov	cx, [esi+ptBeginSector]
   666 00007AE7 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   667                              <1> 	;mov	ebx, DOSBootSectorBuff
   668 00007AEB E82FD7FFFF          <1> 	call	int13h
   669 00007AF0 72ED                <1> 	jc	short loc_not_a_valid_fat_partition3
   670                              <1> loc_hd_drv_FAT_boot_validation:
   671                              <1> 	;mov	esi, DOSBootSectorBuff
   672 00007AF2 89DE                <1> 	mov	esi, ebx
   673 00007AF4 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
   674 00007AFD 7512                <1> 	jne	short loc_not_a_valid_fat_partition4
   675 00007AFF 807E15F8            <1> 	cmp	byte [esi+BPB_Media], 0F8h
   676 00007B03 750C                <1> 	jne	short loc_not_a_valid_fat_partition4
   677                              <1> 
   678                              <1> 	; 27/12/2017
   679 00007B05 807D0303            <1> 	cmp	byte [ebp+LD_FATType], 3
   680 00007B09 7508                <1> 	jne	short loc_hd_FAT16_BPB
   681                              <1> 
   682                              <1> loc_hd_drv_FAT32_boot_validation:
   683 00007B0B 807E4229            <1> 	cmp	byte [esi+BS_FAT32_BootSig], 29h
   684 00007B0F 7416                <1> 	je	short loc_hd_FAT32_BPB
   685                              <1> 
   686                              <1> loc_not_a_valid_fat_partition4:
   687 00007B11 F9                  <1> 	stc
   688 00007B12 C3                  <1> 	retn
   689                              <1> 
   690                              <1> loc_hd_FAT16_BPB:
   691 00007B13 807E2629            <1> 	cmp	byte [esi+BS_BootSig], 29h
   692 00007B17 75F8                <1> 	jne	short loc_not_a_valid_fat_partition4
   693                              <1> 
   694 00007B19 66837E1600          <1> 	cmp	word [esi+BPB_FATSz16], 0
   695 00007B1E 7607                <1> 	jna	short loc_hd_big_FAT16_BPB
   696 00007B20 B920000000          <1> 	mov	ecx, 32
   697 00007B25 EB05                <1> 	jmp	short loc_hd_move_FAT_BPB
   698                              <1> 
   699                              <1> loc_hd_FAT32_BPB:
   700                              <1> 	;cmp	word [esi+BPB_FATSz16], 0
   701                              <1> 	;ja	short loc_not_a_valid_fat_partition4
   702                              <1> loc_hd_big_FAT16_BPB:
   703 00007B27 B92D000000          <1> 	mov	ecx, 45
   704                              <1> 	
   705                              <1> loc_hd_move_FAT_BPB:
   706 00007B2C 89EF                <1> 	mov 	edi, ebp
   707                              <1> 	;mov	esi, ebx ; Boot sector
   708 00007B2E 57                  <1> 	push	edi
   709 00007B2F 83C706              <1> 	add	edi, LD_BPB
   710 00007B32 F366A5              <1> 	rep	movsw 
   711 00007B35 5E                  <1> 	pop	esi
   712 00007B36 0FB74614            <1> 	movzx	eax, word [esi+LD_BPB+BPB_RsvdSecCnt]
   713 00007B3A 03466C              <1> 	add	eax, [esi+LD_StartSector]
   714 00007B3D 894660              <1> 	mov	[esi+LD_FATBegin], eax
   715 00007B40 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3
   716 00007B44 7224                <1> 	jb	short loc_set_FAT16_RootDirLoc
   717                              <1> loc_set_FAT32_RootDirLoc:
   718 00007B46 8B462A              <1> 	mov	eax, [esi+LD_BPB+BPB_FATSz32]
   719 00007B49 0FB65E16            <1>         movzx	ebx, byte [esi+LD_BPB+BPB_NumFATs]
   720 00007B4D F7E3                <1> 	mul	ebx
   721 00007B4F 034660              <1> 	add	eax, [esi+LD_FATBegin]
   722                              <1> loc_set_FAT32_data_begin:
   723 00007B52 894668              <1> 	mov	[esi+LD_DATABegin], eax
   724 00007B55 894664              <1> 	mov	[esi+LD_ROOTBegin], eax
   725                              <1> 	; If Root Directory Cluster <> 2 then
   726                              <1> 	; change the beginning sector value 
   727                              <1> 	; of the root dir by adding sector offset.
   728 00007B58 8B4632              <1> 	mov	eax, [esi+LD_BPB+BPB_RootClus]
   729 00007B5B 83E802              <1> 	sub	eax, 2
   730 00007B5E 7435                <1> 	jz	short short loc_set_32bit_FAT_total_sectors  
   731                              <1> 	;movzx	ebx, byte [esi+LD_BPB+BPB_SecPerClust]
   732 00007B60 8A5E13              <1> 	mov	bl, [esi+LD_BPB+BPB_SecPerClust] 
   733 00007B63 F7E3                <1> 	mul	ebx
   734 00007B65 014664              <1> 	add	[esi+LD_ROOTBegin], eax
   735 00007B68 EB2B                <1> 	jmp	short loc_set_32bit_FAT_total_sectors
   736                              <1> 	;
   737                              <1> loc_set_FAT16_RootDirLoc:
   738 00007B6A 0FB64616            <1> 	movzx	eax, byte [esi+LD_BPB+BPB_NumFATs]
   739 00007B6E 0FB7561C            <1> 	movzx	edx, word [esi+LD_BPB+BPB_FATSz16]
   740 00007B72 F7E2                <1> 	mul	edx
   741 00007B74 034660              <1> 	add	eax, [esi+LD_FATBegin]  
   742 00007B77 894664              <1> 	mov	[esi+LD_ROOTBegin], eax
   743                              <1> loc_set_FAT16_data_begin:
   744 00007B7A 894668              <1> 	mov	[esi+LD_DATABegin], eax 
   745                              <1> 	;mov	eax, 20h  ; Size of a directory entry
   746                              <1> 	;;movzx	edx, word [esi+LD_BPB+BPB_RootEntCnt]
   747                              <1>         ;mov     dx, [esi+LD_BPB+BPB_RootEntCnt]
   748                              <1>         ;mul	edx
   749                              <1> 	;;mov	ecx, 511
   750                              <1> 	;mov	cx, 511
   751                              <1> 	;add	eax, ecx
   752                              <1> 	;inc	ecx ; 512
   753                              <1> 	;div	ecx
   754                              <1> 	; 14/07/2020
   755 00007B7D 0FB74617            <1> 	movzx	eax, word [esi+LD_BPB+BPB_RootEntCnt]
   756 00007B81 6683C00F            <1> 	add	ax, 15
   757 00007B85 66C1E804            <1> 	shr	ax, 4 ; / 16 ; (16 entries per sector)
   758 00007B89 014668              <1> 	add	[esi+LD_DATABegin], eax
   759                              <1> 	;movzx	eax, word [esi+LD_BPB+BPB_TotalSec16]
   760 00007B8C 668B4619            <1> 	mov	ax, [esi+LD_BPB+BPB_TotalSec16]
   761 00007B90 6685C0              <1> 	test	ax, ax
   762                              <1> 	;jz	short loc_set_32bit_FAT_total_sectors
   763                              <1> ;loc_set_16bit_FAT_total_sectors:
   764                              <1> 	;mov	[esi+LD_TotalSectors], eax
   765                              <1> 	;jmp	short loc_set_hd_FAT_cluster_count
   766                              <1> 	; 14/07/2020
   767 00007B93 7503                <1> 	jnz	short loc_set_hd_FAT_cluster_count
   768                              <1> loc_set_32bit_FAT_total_sectors:
   769 00007B95 8B4626              <1> 	mov	eax, [esi+LD_BPB+BPB_TotalSec32]
   770                              <1> 	;mov	[esi+LD_TotalSectors], eax
   771                              <1> loc_set_hd_FAT_cluster_count:
   772 00007B98 894670              <1> 	mov	[esi+LD_TotalSectors], eax ; 14/07/2020
   773 00007B9B 8B5668              <1> 	mov	edx, [esi+LD_DATABegin]
   774 00007B9E 2B566C              <1> 	sub	edx, [esi+LD_StartSector]
   775 00007BA1 29D0                <1> 	sub	eax, edx
   776 00007BA3 31D2                <1> 	xor	edx, edx ; 0
   777 00007BA5 0FB64E13            <1>         movzx   ecx, byte [esi+LD_BPB+BPB_SecPerClust]
   778 00007BA9 F7F1                <1>         div	ecx 
   779 00007BAB 894678              <1> 	mov	[esi+LD_Clusters], eax
   780                              <1> 	; Maximum Valid Cluster Number= EAX +1
   781                              <1> 	; with 2 reserved clusters= EAX +2
   782                              <1> loc_set_hd_FAT_fs_free_sectors:
   783                              <1> 	;mov	dword [esi+LD_FreeSectors], 0
   784 00007BAE E855010000          <1> 	call	get_free_FAT_sectors
   785 00007BB3 720D                <1> 	jc	short loc_validate_hd_FAT_partition_retn
   786 00007BB5 894674              <1> 	mov	[esi+LD_FreeSectors], eax
   787 00007BB8 C6467E06            <1> 	mov	byte [esi+LD_MediaChanged], 6  ; Volume Name Reset
   788                              <1> 
   789                              <1> 	; 15/07/2020
   790 00007BBC FE05[22380100]      <1> 	inc 	byte [Last_DOS_DiskNo] ; > 1
   791                              <1> 
   792                              <1> 	;mov	cl, [Last_DOS_DiskNo] 
   793                              <1> 	;add	cl, 'A'
   794                              <1> 	;mov	[esi+LD_FS_Name], cl
   795                              <1> 
   796                              <1> loc_validate_hd_FAT_partition_retn:         
   797 00007BC2 C3                  <1> 	retn
   798                              <1> 
   799                              <1> validate_hd_fs_partition:
   800                              <1> 	; 03/02/2018
   801                              <1> 	; 09/12/2017
   802                              <1> 	; 13/02/2016
   803                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
   804                              <1> 	; 29/01/2011
   805                              <1> 	; 23/07/2011
   806                              <1> 	; Input
   807                              <1> 	;   DL = Hard/Fixed Disk Drive Number
   808                              <1> 	;   ESI = PartitionTable offset
   809                              <1> 	;   byte [Last_DOS_DiskNo]
   810                              <1> 	; Output
   811                              <1> 	;  cf=0 -> Validated
   812                              <1> 	;   ESI = Logical dos drv desc. table
   813                              <1> 	;   EBX = Singlix FS boot sector buffer
   814                              <1> 	;   byte [Last_DOS_DiskNo]
   815                              <1> 	;  cf=1 -> Not a valid 'Singlix FS' partition
   816                              <1> 	; EAX, EDX, ECX, EDI -> changed 
   817                              <1> 
   818                              <1> 	;mov	esi, PartitionTable
   819 00007BC3 8A6604              <1> 	mov	ah, [esi+ptFileSystemID]
   820 00007BC6 80FCA1              <1> 	cmp	ah, 0A1h ; SINGLIX FS1 (trfs1) partition
   821 00007BC9 7549                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   822                              <1> loc_set_valid_hd_fs_partition_params:
   823 00007BCB FE05[22380100]      <1> 	inc	byte [Last_DOS_DiskNo] ; > 1
   824 00007BD1 30C0                <1> 	xor	al, al ; mov al, 0
   825                              <1> 	;mov	[drv], dl
   826 00007BD3 29DB                <1> 	sub	ebx, ebx ; 0
   827 00007BD5 8A3D[22380100]      <1> 	mov	bh, [Last_DOS_DiskNo] 
   828 00007BDB 81C300010900        <1> 	add	ebx, Logical_DOSDisks
   829 00007BE1 C6430102            <1> 	mov	byte [ebx+LD_DiskType], 2
   830 00007BE5 885302              <1> 	mov	[ebx+LD_PhyDrvNo], dl
   831                              <1> 	;mov	[ebx+LD_FATType], al ; 0
   832                              <1> 	;mov	[ebx+LD_FSType], ah
   833 00007BE8 66894303            <1> 	mov	[ebx+LD_FATType], ax
   834                              <1> 	;mov	eax, [esi+ptStartSector]
   835                              <1> 	;mov	[ebx+LD_StartSector], eax
   836                              <1> loc_hd_fs_logical_drv_init:
   837 00007BEC 89DD                <1> 	mov	ebp, ebx ; 10/01/2016
   838                              <1> 	;mov	dl, [ebx+LD_PhyDrvNo]
   839 00007BEE A0[5A870100]        <1> 	mov	al, [HD_LBA_yes] ; 10/01/2016
   840 00007BF3 884305              <1> 	mov	[ebx+LD_LBAYes], al
   841 00007BF6 89DE                <1> 	mov	esi, ebx
   842 00007BF8 BB[66870100]        <1> 	mov	ebx, DOSBootSectorBuff ; buffer address
   843 00007BFD 08C0                <1> 	or	al, al
   844 00007BFF 7515                <1> 	jnz	short loc_hd_fs_drv_init_load_bs_lba
   845                              <1> loc_hd_fs_drv_init_load_bs_chs:
   846 00007C01 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   847 00007C04 668B4E02            <1> 	mov	cx, [esi+ptBeginSector]
   848 00007C08 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   849                              <1> 	;mov	ebx, DOSBootSectorBuff
   850 00007C0C E80ED6FFFF          <1> 	call	int13h
   851 00007C11 7311                <1> 	jnc	short loc_hd_drv_fs_boot_validation
   852                              <1> loc_validate_hd_fs_partition_err_retn:
   853 00007C13 C3                  <1> 	retn
   854                              <1> loc_validate_hd_fs_partition_stc_retn:
   855 00007C14 F9                  <1> 	stc
   856 00007C15 C3                  <1> 	retn
   857                              <1> loc_hd_fs_drv_init_load_bs_lba:
   858                              <1> 	; DL = Physical drive number
   859                              <1> 	;mov	esi, ebx
   860 00007C16 8B4E08              <1>    	mov	ecx, [esi+ptStartSector] ; sector number
   861                              <1> 	;mov	ebx, DOSBootSectorBuff ; buffer address
   862                              <1> 	; LBA read/write (with private LBA function) 
   863                              <1> 	;((Retro UNIX 386 v1 - DISK I/O code by Erdogan Tan))
   864                              <1> 	; dl = physical drive number (0,1, 80h, 81h, 82h, 83h)
   865 00007C19 B41B                <1> 	mov	ah, 1Bh ; LBA read
   866 00007C1B B001                <1> 	mov	al, 1 ; sector count
   867 00007C1D E8FDD5FFFF          <1> 	call	int13h
   868 00007C22 72EF                <1> 	jc	short loc_validate_hd_fs_partition_err_retn
   869                              <1> loc_hd_drv_fs_boot_validation:
   870                              <1> 	;mov	esi, DOSBootSectorBuff
   871 00007C24 89DE                <1> 	mov	esi, ebx ; Boot sector buffer
   872 00007C26 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
   873 00007C2F 75E3                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   874                              <1>         ;
   875                              <1> 	;Singlix FS Extensions to TR-DOS (7/6/2009) 
   876 00007C31 66817E034653        <1> 	cmp	word [esi+bs_FS_Identifier], 'FS' ; 03/02/2018
   877 00007C37 75DB                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   878                              <1>         ;'A1h' check is not necessary
   879                              <1> 	;  if 'FS' check is passed as OK/Yes.
   880 00007C39 807E09A1            <1> 	cmp	byte [esi+bs_FS_PartitionID], 0A1h
   881 00007C3D 75D5                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   882                              <1> 	;
   883 00007C3F 89EF                <1> 	mov	edi, ebp ; 10/01/2016
   884                              <1> 	;
   885 00007C41 8A462D              <1> 	mov	al, byte [esi+bs_FS_LBA_Ready]
   886 00007C44 884705              <1> 	mov	[edi+LD_FS_LBAYes], al
   887                              <1> 	;
   888                              <1> 	; 03/01/2010 CHS -> DOS FAT/BPB compatibility fix
   889 00007C47 8A4608              <1> 	mov	al, [esi+bs_FS_MediaAttrib]
   890 00007C4A 884706              <1> 	mov	byte [edi+LD_FS_MediaAttrib], al
   891                              <1> 	;
   892 00007C4D 8A460A              <1> 	mov	al, [esi+bs_FS_VersionMaj]
   893 00007C50 884707              <1> 	mov	[edi+LD_FS_VersionMajor], al
   894                              <1> 	;
   895 00007C53 668B4606            <1> 	mov	ax, [esi+bs_FS_BytesPerSec]
   896 00007C57 66894711            <1> 	mov	[edi+LD_FS_BytesPerSec], ax
   897 00007C5B 8A462E              <1> 	mov	al, [esi+bs_FS_SecPerTrack]
   898 00007C5E 30E4                <1> 	xor	ah, ah ; 09/12/2017
   899 00007C60 6689471E            <1> 	mov	[edi+LD_FS_SecPerTrack], ax
   900 00007C64 8A462F              <1> 	mov	al, [esi+bs_FS_Heads]
   901 00007C67 66894720            <1> 	mov	[edi+LD_FS_NumHeads], ax
   902                              <1> 	;
   903 00007C6B 8B4628              <1> 	mov	eax, [esi+bs_FS_UnDelDirD]
   904 00007C6E 894722              <1> 	mov	[edi+LD_FS_UnDelDirD], eax
   905 00007C71 8B5618              <1> 	mov	edx, [esi+bs_FS_MATLocation]
   906 00007C74 89570C              <1> 	mov	[edi+LD_FS_MATLocation], edx
   907 00007C77 8B461C              <1> 	mov	eax, [esi+bs_FS_RootDirD]
   908 00007C7A 894708              <1> 	mov	[edi+LD_FS_RootDirD], eax
   909 00007C7D 8B460C              <1> 	mov	eax, [esi+bs_FS_BeginSector]
   910 00007C80 89476C              <1> 	mov	[edi+LD_FS_BeginSector], eax
   911 00007C83 8B4710              <1> 	mov	eax, [edi+bs_FS_VolumeSize]
   912 00007C86 894770              <1> 	mov	[edi+LD_FS_VolumeSize], eax
   913                              <1> 	;
   914 00007C89 89D0                <1> 	mov	eax, edx ; [edi+LD_FS_MATLocation]
   915 00007C8B 03476C              <1> 	add	eax, [edi+LD_FS_BeginSector]
   916 00007C8E 89FE                <1> 	mov	esi, edi
   917                              <1> mread_hd_fs_MAT_sector:
   918                              <1>        ;mov	ebx, DOSBootSectorBuff
   919 00007C90 B901000000          <1> 	mov	ecx, 1
   920 00007C95 E883A60000          <1> 	call	disk_read
   921 00007C9A 7248                <1> 	jc	short loc_validate_hd_fs_partition_retn
   922                              <1> 	; EDI will not be changed
   923 00007C9C 89DE                <1> 	mov	esi, ebx
   924                              <1> use_hdfs_mat_sector_params:
   925 00007C9E 8B460C              <1> 	mov	eax, [esi+FS_MAT_DATLocation]
   926 00007CA1 894714              <1> 	mov	[edi+LD_FS_DATLocation], eax
   927 00007CA4 8B4610              <1> 	mov	eax, [esi+FS_MAT_DATScount]
   928 00007CA7 894718              <1> 	mov	[edi+LD_FS_DATSectors], eax
   929 00007CAA 8B4614              <1> 	mov	eax, [esi+FS_MAT_FreeSectors]
   930 00007CAD 894774              <1>         mov     [edi+LD_FS_FreeSectors], eax
   931 00007CB0 8B4618              <1> 	mov	eax, [esi+FS_MAT_FirstFreeSector]
   932 00007CB3 894778              <1> 	mov	[edi+LD_FS_FirstFreeSector], eax
   933 00007CB6 8B4708              <1> 	mov	eax, [edi+LD_FS_RootDirD]
   934 00007CB9 03476C              <1> 	add	eax, [edi+LD_FS_BeginSector]
   935 00007CBC 89FE                <1> 	mov	esi, edi   
   936                              <1> read_hd_fs_RDT_sector:
   937 00007CBE BB[66870100]        <1> 	mov	ebx, DOSBootSectorBuff
   938                              <1> 	;mov	ecx, 1
   939 00007CC3 B101                <1> 	mov	cl, 1
   940 00007CC5 E853A60000          <1> 	call	disk_read
   941 00007CCA 7218                <1> 	jc	short loc_validate_hd_fs_partition_retn
   942                              <1> 	; EDI will not be changed
   943 00007CCC 89DE                <1> 	mov	esi, ebx
   944                              <1> use_hdfs_RDT_sector_params:
   945 00007CCE 8B461C              <1> 	mov	eax, [esi+FS_RDT_VolumeSerialNo]
   946 00007CD1 894728              <1> 	mov	[edi+LD_FS_VolumeSerial], eax
   947 00007CD4 57                  <1> 	push	edi
   948                              <1> 	;mov	ecx, 16
   949 00007CD5 B110                <1> 	mov	cl, 16
   950 00007CD7 83C640              <1> 	add	esi, FS_RDT_VolumeName
   951 00007CDA 83C72C              <1> 	add	edi, LD_FS_VolumeName
   952 00007CDD F3A5                <1> 	rep	movsd ; 64 bytes
   953 00007CDF 5E                  <1> 	pop	esi
   954                              <1> 		; Volume Name Reset
   955 00007CE0 C6467E06            <1>         mov     byte [esi+LD_FS_MediaChanged], 6
   956                              <1> 	;
   957                              <1>         ;mov	cl, [Last_DOS_DiskNo] 
   958                              <1> 	;add	cl, 'A'
   959                              <1> 	;mov	[esi+LD_FS_Name], cl
   960                              <1> 
   961                              <1> loc_validate_hd_fs_partition_retn:
   962 00007CE4 C3                  <1> 	retn
   963                              <1> 
   964                              <1> load_masterboot:
   965                              <1> 	; 14/07/2020 (Reset function has been removed)
   966                              <1> 	;
   967                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
   968                              <1> 	; 2005 - 2011
   969                              <1> 	; input -> DL = drive number
   970                              <1> ;	mov	ah, 0Dh ; Alternate disk reset
   971                              <1> ;	call	int13h
   972                              <1> ;	jnc	short pass_reset_error
   973                              <1> ;harddisk_error:
   974                              <1> ;  	retn
   975                              <1> ;pass_reset_error:
   976 00007CE5 BB[56840100]        <1> 	mov	ebx, MasterBootBuff
   977 00007CEA 66B80102            <1> 	mov	ax, 0201h
   978 00007CEE 66B90100            <1> 	mov	cx, 1
   979 00007CF2 30F6                <1> 	xor	dh, dh
   980 00007CF4 E826D5FFFF          <1>  	call	int13h
   981 00007CF9 720C                <1> 	jc	short harddisk_error
   982                              <1> 	;
   983 00007CFB 66813D[54860100]55- <1> 	cmp	word [MBIDCode], 0AA55h
   983 00007D03 AA                  <1>
   984 00007D04 7401                <1> 	je	short load_masterboot_ok
   985 00007D06 F9                  <1> 	stc
   986                              <1> harddisk_error:
   987                              <1> load_masterboot_ok:
   988 00007D07 C3                  <1> 	retn
   989                              <1> 
   990                              <1> get_free_FAT_sectors:
   991                              <1> 	; 21/12/2017
   992                              <1> 	; 29/02/2016
   993                              <1> 	; 13/02/2016
   994                              <1> 	; 04/02/2016
   995                              <1> 	; 07/01/2016 (TRDOS 386 = TRDOS v2.0)
   996                              <1> 	; 11/07/2010
   997                              <1> 	; 21/06/2009
   998                              <1> 	; INPUT: ESI = Logical DOS Drive Description Table address
   999                              <1> 	; OUTPUT: STC => Error
  1000                              <1>         ;	cf = 0 and EAX = Free FAT sectors
  1001                              <1> 	; Also, related parameters and FAT buffer will be reset and updated
  1002                              <1> 
  1003 00007D08 31C0                <1> 	xor	eax, eax
  1004                              <1> 	;mov	[esi+LD_FreeSectors], eax ; Reset
  1005                              <1> 	
  1006 00007D0A 807E0302            <1>         cmp     byte [esi+LD_FATType], 2
  1007 00007D0E 7654                <1> 	jna	short loc_gfc_get_fat_free_clusters
  1008                              <1> 
  1009                              <1> 	; 29/02/2016
  1010 00007D10 48                  <1> 	dec	eax ; 0FFFFFFFFh
  1011 00007D11 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count (reset)
  1012 00007D14 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; First Free Cluster (reset)
  1013 00007D17 40                  <1> 	inc	eax ; 0
  1014                              <1> 	;
  1015 00007D18 668B4636            <1> 	mov	ax, [esi+LD_BPB+BPB_FSInfo]
  1016 00007D1C 03466C              <1> 	add	eax, [esi+LD_StartSector]
  1017                              <1> 
  1018 00007D1F BB[66870100]        <1> 	mov	ebx, DOSBootSectorBuff
  1019 00007D24 B901000000          <1> 	mov	ecx, 1
  1020 00007D29 E8EFA50000          <1>  	call	disk_read
  1021 00007D2E 7301                <1> 	jnc	short loc_gfc_check_fsinfo_signs
  1022                              <1> retn_gfc_get_fsinfo_sec:
  1023 00007D30 C3                  <1> 	retn
  1024                              <1> 
  1025                              <1> loc_gfc_check_fsinfo_signs:
  1026 00007D31 BB[66870100]        <1> 	mov 	ebx, DOSBootSectorBuff ; 13/02/2016
  1027 00007D36 813B52526141        <1>         cmp     dword [ebx], 41615252h
  1028 00007D3C 7524                <1> 	jne	short retn_gfc_get_fsinfo_stc
  1029                              <1> 	;add	ebx, 484
  1030                              <1> 	;cmp	dword [ebx], 61417272h
  1031 00007D3E 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
  1031 00007D47 61                  <1>
  1032 00007D48 7518                <1> 	jne	short retn_gfc_get_fsinfo_stc
  1033                              <1> 	;add	ebx, 4
  1034                              <1> 	;mov	eax, [ebx]
  1035 00007D4A 8B83E8010000        <1> 	mov	eax, [ebx+488]
  1036                              <1> 	; 29/02/2016
  1037 00007D50 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count
  1038 00007D53 8B93EC010000        <1> 	mov	edx,  [ebx+492] 
  1039 00007D59 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; First Free Cluster
  1040                              <1> 	; 21/12/2017
  1041 00007D5C 89C3                <1> 	mov	ebx, eax ; (initial value = 0FFFFFFFFh)
  1042 00007D5E 43                  <1> 	inc	ebx ; 0FFFFFFFFh -> 0  
  1043 00007D5F 7513                <1> 	jnz	short short retn_from_get_free_fat32_clusters
  1044 00007D61 C3                  <1> 	retn
  1045                              <1> 
  1046                              <1> retn_gfc_get_fsinfo_stc:
  1047 00007D62 F9                  <1> 	stc
  1048 00007D63 C3                  <1> 	retn
  1049                              <1> 
  1050                              <1> loc_gfc_get_fat_free_clusters:
  1051                              <1> 	;mov	eax, 2
  1052 00007D64 B002                <1> 	mov	al, 2
  1053                              <1> 	;mov	[FAT_CurrentCluster], eax
  1054                              <1> loc_gfc_loop_get_next_cluster:
  1055 00007D66 E8EB4F0000          <1> 	call	get_next_cluster
  1056 00007D6B 730E                <1> 	jnc	short loc_gfc_free_fat_clusters_cont
  1057 00007D6D 21C0                <1> 	and	eax, eax
  1058 00007D6F 7411                <1> 	jz	short loc_gfc_pass_inc_free_cluster_count
  1059                              <1>  
  1060                              <1> retn_from_get_free_fat_clusters:
  1061 00007D71 8B4674              <1> 	mov	eax, [esi+LD_FreeSectors] ; Free clusters !
  1062                              <1> retn_from_get_free_fat32_clusters:
  1063 00007D74 0FB65E13            <1>         movzx	ebx, byte [esi+LD_BPB+BPB_SecPerClust]
  1064 00007D78 F7E3                <1>       	mul	ebx
  1065                              <1> 	;mov	[esi+LD_FreeSectors], eax ; Free sectors
  1066                              <1> retn_get_free_sectors_calc:
  1067 00007D7A C3                  <1> 	retn
  1068                              <1> 
  1069                              <1> loc_gfc_free_fat_clusters_cont:
  1070 00007D7B 09C0                <1> 	or	eax, eax
  1071 00007D7D 7503                <1> 	jnz	short loc_gfc_pass_inc_free_cluster_count
  1072 00007D7F FF4674              <1> 	inc	dword [esi+LD_FreeSectors] ; Free clusters !
  1073                              <1>    
  1074                              <1> loc_gfc_pass_inc_free_cluster_count:
  1075                              <1> 	;mov	eax, [FAT_CurrentCluster]
  1076 00007D82 89C8                <1> 	mov	eax, ecx ; [FAT_CurrentCluster]
  1077 00007D84 3B4678              <1> 	cmp	eax, [esi+LD_Clusters]
  1078 00007D87 77E8                <1> 	ja	short retn_from_get_free_fat_clusters
  1079 00007D89 40                  <1> 	inc	eax
  1080                              <1> 	;mov	[FAT_CurrentCluster], eax
  1081 00007D8A EBDA                <1> 	jmp	short loc_gfc_loop_get_next_cluster
  1082                              <1> 
  1083                              <1> floppy_drv_init:
  1084                              <1> 	; 09/12/2017
  1085                              <1> 	; 06/07/2016
  1086                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1087                              <1> 	; 24/07/2011
  1088                              <1> 	; 04/07/2009
  1089                              <1> 	; INPUT ->
  1090                              <1> 	;	DL = Drive number (0,1)
  1091                              <1> 	; OUTPUT ->
  1092                              <1> 	;	BL = drive name
  1093                              <1> 	;	BH = drive number
  1094                              <1> 	;	ESI = Logical DOS drv description table
  1095                              <1> 	;	EAX = Volume serial number
  1096                              <1>  
  1097 00007D8C BE[EE6D0000]        <1> 	mov	esi, fd0_type ; 10/01/2016
  1098 00007D91 BF00010900          <1> 	mov	edi, Logical_DOSDisks
  1099 00007D96 08D2                <1> 	or	dl, dl
  1100 00007D98 7407                <1> 	jz	short loc_drv_init_fd0_fd1
  1101 00007D9A 81C700010000        <1> 	add	edi, 100h
  1102 00007DA0 46                  <1> 	inc	esi ; fd1_type ; 10/01/2016
  1103                              <1> loc_drv_init_fd0_fd1:
  1104 00007DA1 C6477E00            <1> 	mov	byte [edi+LD_MediaChanged], 0
  1105 00007DA5 803E01              <1> 	cmp	byte [esi], 1 ; type (>0 if it is existing) 
  1106                              <1> 		; 4 = 1.44 MB, 80 track, 3 1/2"
  1107 00007DA8 7221                <1> 	jb	short read_fd_boot_sector_retn
  1108 00007DAA 885702              <1> 	mov	[edi+LD_PhyDrvNo], dl
  1109                              <1> read_fd_boot_sector:
  1110 00007DAD 30F6                <1> 	xor	dh, dh
  1111 00007DAF B904000000          <1> 	mov	ecx, 4 ; Retry Count
  1112                              <1> read_fd_boot_sector_again:
  1113 00007DB4 51                  <1> 	push 	ecx
  1114                              <1> 	;mov	cx, 1
  1115 00007DB5 B101                <1> 	mov	cl, 1
  1116 00007DB7 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
  1117 00007DBB BB[66870100]        <1> 	mov	ebx, DOSBootSectorBuff
  1118 00007DC0 E85AD4FFFF          <1> 	call	int13h
  1119 00007DC5 59                  <1> 	pop	ecx
  1120 00007DC6 7304                <1> 	jnc	short use_fd_boot_sector_params
  1121 00007DC8 E2EA                <1> 	loop	read_fd_boot_sector_again
  1122                              <1> 
  1123                              <1> read_fd_boot_sector_stc_retn:
  1124 00007DCA F9                  <1> 	stc
  1125                              <1> read_fd_boot_sector_retn:
  1126 00007DCB C3                  <1> 	retn
  1127                              <1> 
  1128                              <1> use_fd_boot_sector_params:
  1129                              <1> 	;mov	esi, DOSBootSectorBuff
  1130 00007DCC 89DE                <1> 	mov	esi, ebx
  1131 00007DCE 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
  1132 00007DD7 75F1                <1> 	jne	short read_fd_boot_sector_stc_retn
  1133 00007DD9 66817E035346        <1>         cmp     word [esi+bs_FS_Identifier], 'SF'
  1134 00007DDF 0F85A2000000        <1>         jne     use_fd_fatfs_boot_sector_params
  1135                              <1> 	;
  1136 00007DE5 8A462D              <1> 	mov	al, [esi+bs_FS_LBA_Ready]
  1137 00007DE8 884705              <1> 	mov	[edi+LD_FS_LBAYes], al
  1138                              <1> 	;
  1139                              <1> 	; 03/01/2010 CHS -> DOS FAT/BPB compatibility fix
  1140 00007DEB 8A4608              <1> 	mov	al, [esi+bs_FS_MediaAttrib]
  1141 00007DEE 884706              <1> 	mov	[edi+LD_FS_MediaAttrib], al
  1142                              <1> 	;
  1143 00007DF1 8A460A              <1>         mov	al, [esi+bs_FS_VersionMaj]
  1144 00007DF4 884707              <1> 	mov	byte [edi+LD_FS_VersionMajor], al
  1145 00007DF7 668B4606            <1> 	mov	ax, [esi+bs_FS_BytesPerSec]
  1146 00007DFB 66894711            <1> 	mov	[edi+LD_FS_BytesPerSec], ax
  1147 00007DFF 8A462E              <1> 	mov	al, [esi+bs_FS_SecPerTrack]
  1148 00007E02 28E4                <1> 	sub	ah, ah ; 09/12/2017
  1149 00007E04 6689471E            <1> 	mov	[edi+LD_FS_SecPerTrack], ax
  1150 00007E08 8A462F              <1> 	mov	al, [esi+bs_FS_Heads]
  1151 00007E0B 66894720            <1> 	mov	[edi+LD_FS_NumHeads], ax
  1152                              <1> 	;
  1153 00007E0F 8B4628              <1> 	mov	eax, [esi+bs_FS_UnDelDirD]
  1154 00007E12 894722              <1> 	mov	[edi+LD_FS_UnDelDirD], eax
  1155 00007E15 8B4618              <1> 	mov	eax, [esi+bs_FS_MATLocation]
  1156 00007E18 89470C              <1> 	mov	[edi+LD_FS_MATLocation], eax
  1157 00007E1B 8B461C              <1> 	mov	eax, [esi+bs_FS_RootDirD]
  1158 00007E1E 894708              <1> 	mov	[edi+LD_FS_RootDirD], eax
  1159 00007E21 8B460C              <1> 	mov	eax, [esi+bs_FS_BeginSector]
  1160 00007E24 89476C              <1> 	mov	[edi+LD_FS_BeginSector], eax
  1161 00007E27 8B4610              <1> 	mov	eax, [esi+bs_FS_VolumeSize]
  1162 00007E2A 894770              <1> 	mov	[edi+LD_FS_VolumeSize], eax
  1163                              <1> 	;		
  1164 00007E2D 89FE                <1> 	mov	esi, edi
  1165 00007E2F 8B460C              <1>  	mov	eax, [esi+LD_FS_MATLocation]
  1166                              <1> 	;add	eax, [edi+LD_FS_BeginSector]
  1167                              <1> read_fd_MAT_sector_again:
  1168                              <1> 	;mov	ebx, DOSBootSectorBuff
  1169                              <1> 	;mov	ecx, 1
  1170 00007E32 B101                <1> 	mov	cl, 1
  1171 00007E34 E8EAA40000          <1> 	call	chs_read
  1172 00007E39 89DE                <1> 	mov	esi, ebx
  1173 00007E3B 7301                <1> 	jnc	short use_fdfs_mat_sector_params
  1174                              <1> 	;jmp	short read_fd_boot_sector_retn
  1175 00007E3D C3                  <1> 	retn
  1176                              <1> use_fdfs_mat_sector_params:
  1177 00007E3E 8B460C              <1> 	mov	eax, [esi+FS_MAT_DATLocation]
  1178 00007E41 894714              <1> 	mov	[edi+LD_FS_DATLocation], eax
  1179 00007E44 8B4610              <1> 	mov	eax, [esi+FS_MAT_DATScount]
  1180 00007E47 894718              <1> 	mov	[edi+LD_FS_DATSectors], eax
  1181 00007E4A 8B4714              <1> 	mov	eax, [edi+FS_MAT_FreeSectors]
  1182 00007E4D 894774              <1> 	mov	[edi+LD_FS_FreeSectors], eax
  1183 00007E50 8B4618              <1> 	mov	eax, [esi+FS_MAT_FirstFreeSector]
  1184 00007E53 894778              <1> 	mov	[edi+LD_FS_FirstFreeSector], eax
  1185                              <1> 	;
  1186 00007E56 89FE                <1> 	mov	esi, edi
  1187 00007E58 8B4608              <1>  	mov	eax, [esi+LD_FS_RootDirD]
  1188                              <1> read_fd_RDT_sector_again:
  1189                              <1> 	;mov	ebx, DOSBootSectorBuff
  1190                              <1> 	;mov	cx, 1
  1191 00007E5B B101                <1> 	mov	cl, 1
  1192 00007E5D E8C1A40000          <1> 	call	chs_read
  1193 00007E62 89DE                <1> 	mov	esi, ebx
  1194 00007E64 7220                <1> 	jc	short read_fd_RDT_sector_retn
  1195                              <1> use_fdfs_RDT_sector_params:
  1196 00007E66 8B461C              <1> 	mov	eax, [esi+FS_RDT_VolumeSerialNo]
  1197 00007E69 894728              <1> 	mov	[edi+LD_FS_VolumeSerial], eax
  1198 00007E6C 57                  <1> 	push	edi
  1199                              <1> 	;mov	ecx, 16
  1200 00007E6D B110                <1> 	mov	cl, 16	
  1201 00007E6F 83C640              <1> 	add	esi, FS_RDT_VolumeName
  1202 00007E72 83C72C              <1> 	add	edi, LD_FS_VolumeName
  1203 00007E75 F3A5                <1> 	rep	movsd ; 64 bytes
  1204 00007E77 5E                  <1> 	pop	esi
  1205 00007E78 C6460300            <1> 	mov	byte [esi+LD_FATType], 0
  1206 00007E7C C64604A1            <1> 	mov	byte [esi+LD_FSType], 0A1h  
  1207 00007E80 E9A5000000          <1>         jmp     loc_cont_use_fd_boot_sector_params
  1208                              <1> 
  1209                              <1> read_fd_RDT_sector_stc_retn:
  1210 00007E85 F9                  <1> 	stc
  1211                              <1> read_fd_RDT_sector_retn:
  1212 00007E86 C3                  <1> 	retn
  1213                              <1> 
  1214                              <1> use_fd_fatfs_boot_sector_params:
  1215 00007E87 807E2629            <1> 	cmp	byte [esi+BS_BootSig], 29h
  1216 00007E8B 75F8                <1> 	jne	short read_fd_RDT_sector_stc_retn
  1217 00007E8D 807E15F0            <1> 	cmp	byte [esi+BPB_Media], 0F0h
  1218 00007E91 72F3                <1> 	jb	short read_fd_RDT_sector_retn
  1219 00007E93 57                  <1> 	push	edi
  1220 00007E94 83C706              <1> 	add	edi, LD_BPB
  1221                              <1> 	;mov	ecx, 16
  1222 00007E97 B110                <1> 	mov	cl, 16
  1223 00007E99 F3A5                <1> 	rep	movsd ; 64 bytes 
  1224 00007E9B 5E                  <1> 	pop	esi
  1225 00007E9C 31C0                <1> 	xor	eax, eax
  1226 00007E9E 89466C              <1> 	mov	[esi+LD_StartSector], eax ; 0
  1227 00007EA1 668B461C            <1> 	mov	ax, [esi+LD_BPB+BPB_FATSz16]
  1228 00007EA5 8A4E16              <1> 	mov	cl, [esi+LD_BPB+BPB_NumFATs] 
  1229 00007EA8 F7E1                <1>   	mul	ecx
  1230                              <1> 	; edx = 0 !
  1231 00007EAA 668B5614            <1> 	mov	dx, [esi+LD_BPB+BPB_RsvdSecCnt]
  1232 00007EAE 66895660            <1> 	mov	[esi+LD_FATBegin], dx
  1233                              <1> 	;add	eax, edx
  1234 00007EB2 6601D0              <1> 	add	ax, dx
  1235 00007EB5 894664              <1> 	mov	[esi+LD_ROOTBegin], eax
  1236 00007EB8 894668              <1> 	mov	[esi+LD_DATABegin], eax 
  1237 00007EBB 668B5617            <1> 	mov	dx, [esi+LD_BPB+BPB_RootEntCnt]
  1238                              <1> 	;;shl	edx, 5 ; * 32 (Size of a directory entry)
  1239                              <1> 	;shl	dx, 5
  1240                              <1> 	;;add	edx, 511
  1241                              <1> 	;add	dx, 511
  1242                              <1> 	;;shr	edx, 9 ; edx = ((edx*32)+511) / 512
  1243                              <1> 	;shr	dx, 9
  1244 00007EBF 6683C20F            <1> 	add	dx, 15 ; 06/07/2016 (+(512/32)-1)
  1245 00007EC3 66C1EA04            <1> 	shr	dx, 4 ; / 16 (==16 entries per sector)
  1246 00007EC7 015668              <1> 	add 	[esi+LD_DATABegin], edx ; + rd sectors
  1247                              <1> 	;movzx	eax, word [esi+LD_BPB+BPB_TotalSec16]
  1248 00007ECA 668B4619            <1> 	mov	ax, [esi+LD_BPB+BPB_TotalSec16]
  1249 00007ECE 894670              <1> 	mov	[esi+LD_TotalSectors], eax
  1250 00007ED1 2B4668              <1> 	sub	eax, [esi+LD_DATABegin]
  1251                              <1>   	;movzx	ecx, byte [esi+LD_BPB+BPB_SecPerClust]
  1252 00007ED4 8A4E13              <1> 	mov	cl, [esi+LD_BPB+BPB_SecPerClust]  
  1253 00007ED7 80F901              <1> 	cmp	cl, 1
  1254 00007EDA 7605                <1> 	jna	short save_fd_fatfs_cluster_count
  1255                              <1> 	;sub	edx, edx
  1256 00007EDC 6629D2              <1> 	sub	dx, dx ; 0
  1257                              <1> 	;sub	dl, dl ; 06/07/2016
  1258 00007EDF F7F1                <1> 	div	ecx
  1259                              <1> save_fd_fatfs_cluster_count:
  1260 00007EE1 894678              <1> 	mov	[esi+LD_Clusters], eax
  1261                              <1> 
  1262                              <1>       ; Maximum Valid Cluster Number = EAX +1
  1263                              <1>       ; with 2 reserved clusters= EAX +2
  1264                              <1>  
  1265                              <1> reset_FAT_buffer_decriptors:
  1266 00007EE4 29C0                <1> 	sub	eax, eax ; 0  
  1267 00007EE6 A2[6A890100]        <1> 	mov	[FAT_BuffValidData], al ; 0
  1268 00007EEB A2[6B890100]        <1> 	mov	[FAT_BuffDrvName], al ; 0
  1269 00007EF0 A3[6E890100]        <1> 	mov	[FAT_BuffSector], eax ; 0
  1270                              <1> 
  1271                              <1> read_fd_FAT_sectors:
  1272 00007EF5 BB001C0900          <1>   	mov	ebx, FAT_Buffer
  1273 00007EFA 668B4614            <1> 	mov	ax, [esi+LD_BPB+BPB_RsvdSecCnt]
  1274                              <1> 	;mov	ecx, 3
  1275 00007EFE B103                <1> 	mov	cl, 3 ; 3 sectors
  1276 00007F00 E81EA40000          <1> 	call	chs_read
  1277 00007F05 7240                <1> 	jc	short read_fd_FAT_sectors_retn
  1278                              <1> use_fd_FAT_sectors:
  1279 00007F07 8A4602              <1> 	mov	al, [esi+LD_PhyDrvNo]
  1280 00007F0A 0441                <1> 	add	al, 'A' 
  1281 00007F0C A2[6B890100]        <1> 	mov	[FAT_BuffDrvName], al 
  1282 00007F11 C605[6A890100]01    <1>  	mov	byte [FAT_BuffValidData], 1
  1283 00007F18 E82B000000          <1> 	call	fd_init_calculate_free_clusters
  1284 00007F1D 7228                <1> 	jc	short read_fd_FAT_sectors_retn
  1285                              <1>   
  1286                              <1> loc_use_fd_boot_sector_params_FAT:
  1287 00007F1F C6460301            <1> 	mov	byte [esi+LD_FATType], 1 ; FAT 12
  1288 00007F23 C6460401            <1> 	mov	byte [esi+LD_FSType], 1
  1289 00007F27 8B462D              <1>         mov     eax, [esi+LD_BPB+VolumeID]
  1290                              <1> loc_cont_use_fd_boot_sector_params:
  1291 00007F2A 8A7E02              <1> 	mov	bh, [esi+LD_PhyDrvNo]
  1292 00007F2D 887E7D              <1> 	mov	[esi+LD_DParamEntry], bh
  1293 00007F30 88FB                <1> 	mov	bl, bh
  1294 00007F32 80C341              <1> 	add	bl, 'A'
  1295 00007F35 881E                <1> 	mov	byte [esi+LD_Name], bl
  1296 00007F37 C6460101            <1> 	mov	byte [esi+LD_DiskType], 1
  1297 00007F3B C6460500            <1> 	mov	byte [esi+LD_LBAYes], 0
  1298 00007F3F C6467C00            <1> 	mov	byte [esi+LD_PartitionEntry], 0
  1299 00007F43 C6467E06            <1> 	mov	byte [esi+LD_MediaChanged], 6 ; Volume Name Reset
  1300                              <1> 
  1301                              <1> read_fd_FAT_sectors_retn:
  1302 00007F47 C3                  <1> 	retn   
  1303                              <1> 
  1304                              <1> fd_init_calculate_free_clusters:
  1305                              <1> 	; 09/12/2017
  1306                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1307                              <1> 	; 04/07/2009
  1308                              <1> 	; INPUT ->
  1309                              <1> 	;     ESI = Logical DOS drive description table address
  1310                              <1> 	; OUTPUT ->
  1311                              <1> 	;    [ESI+LD_FreeSectors] will be set
  1312                              <1> 	
  1313 00007F48 29C0                <1> 	sub	eax, eax
  1314 00007F4A 894674              <1> 	mov	[esi+LD_FreeSectors], eax ; 0
  1315 00007F4D B002                <1> 	mov	al, 2 ; eax = 2
  1316                              <1> 
  1317                              <1> fd_init_loop_get_next_cluster:
  1318 00007F4F E830000000          <1> 	call	fd_init_get_next_cluster
  1319 00007F54 722D                <1> 	jc	short fd_init_calculate_free_clusters_retn
  1320                              <1> 
  1321                              <1> fd_init_free_fat_clusters:
  1322                              <1> 	;cmp 	eax, 0
  1323                              <1> 	;ja	short fd_init_pass_inc_free_cluster_count
  1324                              <1> 	;and	eax, eax
  1325                              <1> 	;jnz	short fd_init_pass_inc_free_cluster_count
  1326 00007F56 6621C0              <1> 	and	ax, ax
  1327 00007F59 7504                <1> 	jnz	short fd_init_pass_inc_free_cluster_count
  1328                              <1> 	;inc	dword [esi+LD_FreeSectors]
  1329 00007F5B 66FF4674            <1>         inc	word [esi+LD_FreeSectors]
  1330                              <1>     
  1331                              <1> fd_init_pass_inc_free_cluster_count:
  1332                              <1>   	;mov	eax, [FAT_CurrentCluster]
  1333 00007F5F 66A1[66890100]      <1> 	mov	ax, [FAT_CurrentCluster]
  1334                              <1> 	;cmp	eax, [esi+LD_Clusters]
  1335 00007F65 663B4678            <1> 	cmp	ax, [esi+LD_Clusters]
  1336 00007F69 7704                <1> 	ja	short short retn_from_fd_init_calculate_free_clusters
  1337                              <1> 	;inc	eax
  1338 00007F6B 6640                <1> 	inc	ax
  1339 00007F6D EBE0                <1> 	jmp	short fd_init_loop_get_next_cluster
  1340                              <1> 
  1341                              <1> retn_from_fd_init_calculate_free_clusters:
  1342 00007F6F 8A4613              <1>   	mov	al, [esi+LD_BPB+BPB_SecPerClust]
  1343 00007F72 3C01                <1>   	cmp	al, 1
  1344 00007F74 760D                <1> 	jna	short fd_init_calculate_free_clusters_retn
  1345                              <1> 	;movzx	eax, al
  1346 00007F76 30E4                <1> 	xor	ah, ah ; 09/12/2017
  1347                              <1> 	;mov	ecx, [esi+LD_FreeSectors]
  1348 00007F78 668B4E74            <1> 	mov	cx, [esi+LD_FreeSectors] ; Count of free clusters
  1349                              <1>   	;mul	ecx
  1350 00007F7C 66F7E1              <1> 	mul	cx
  1351                              <1> 	;mov	[esi+LD_FreeSectors], eax
  1352 00007F7F 66894674            <1> 	mov	[esi+LD_FreeSectors], ax
  1353                              <1> fd_init_calculate_free_clusters_retn:
  1354 00007F83 C3                  <1> 	retn
  1355                              <1> 
  1356                              <1> fd_init_get_next_cluster:
  1357                              <1> 	; 04/02/2016
  1358                              <1> 	; 02/02/2016
  1359                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1360                              <1> 	; 04/07/2009
  1361                              <1> 	; INPUT ->
  1362                              <1> 	;    EAX = Current cluster
  1363                              <1> 	;    ESI = Logical DOS drive description table address
  1364                              <1> 	;    EDX = 0
  1365                              <1> 	; OUTPUT ->
  1366                              <1> 	;    EAX = Next cluster
  1367                              <1> 
  1368 00007F84 A3[66890100]        <1> 	mov	[FAT_CurrentCluster], eax
  1369                              <1> fd_init_get_next_cluster_readnext:
  1370 00007F89 29D2                <1> 	sub	edx, edx ; 0
  1371 00007F8B BB00040000          <1>   	mov	ebx, 1024 ; 400h
  1372 00007F90 F7F3                <1>   	div	ebx
  1373                              <1>   	; EAX = Count of 3 FAT sectors
  1374                              <1>   	; EDX = Buffer entry index
  1375 00007F92 89C1                <1> 	mov	ecx, eax
  1376                              <1> 	;mov	eax, 3
  1377 00007F94 B003                <1> 	mov	al, 3
  1378 00007F96 F7E2                <1> 	mul	edx ; Multiply by 3
  1379 00007F98 66D1E8              <1> 	shr	ax, 1 ; Divide by 2
  1380 00007F9B 89C3                <1> 	mov	ebx, eax ; Buffer byte offset
  1381 00007F9D 81C3001C0900        <1> 	add	ebx, FAT_Buffer
  1382 00007FA3 89C8                <1> 	mov	eax, ecx
  1383                              <1> 	;mov	edx, 3
  1384 00007FA5 66BA0300            <1> 	mov	dx, 3
  1385 00007FA9 F7E2                <1> 	mul	edx 
  1386                              <1>   	; EAX = FAT Beginning Sector
  1387                              <1> 	; EDX = 0
  1388 00007FAB 8A0E                <1> 	mov	cl, [esi+LD_Name]
  1389                              <1> 	;cmp	byte [FAT_BuffValidData], 0
  1390                              <1> 	;jna	short fd_init_load_FAT_sectors0
  1391 00007FAD 3A0D[6B890100]      <1> 	cmp	cl, [FAT_BuffDrvName]
  1392 00007FB3 751E                <1> 	jne	short fd_init_load_FAT_sectors0
  1393 00007FB5 3B05[6E890100]      <1> 	cmp	eax, [FAT_BuffSector]
  1394 00007FBB 751C                <1> 	jne	short fd_init_load_FAT_sectors1
  1395                              <1> 	;mov	eax, [FAT_CurrentCluster]
  1396 00007FBD A0[66890100]        <1> 	mov	al, [FAT_CurrentCluster]
  1397                              <1> 	;shr	eax, 1
  1398 00007FC2 D0E8                <1> 	shr	al, 1
  1399 00007FC4 668B03              <1> 	mov	ax, [ebx]
  1400 00007FC7 7306                <1>   	jnc	short fd_init_gnc_even
  1401 00007FC9 66C1E804            <1> 	shr	ax, 4
  1402                              <1> fd_init_gnc_clc_retn:
  1403 00007FCD F8                  <1> 	clc
  1404 00007FCE C3                  <1> 	retn
  1405                              <1> 
  1406                              <1> fd_init_gnc_even:
  1407 00007FCF 80E40F              <1> 	and	ah, 0Fh
  1408 00007FD2 C3                  <1> 	retn
  1409                              <1> 
  1410                              <1> fd_init_load_FAT_sectors0:
  1411 00007FD3 880D[6B890100]      <1> 	mov 	[FAT_BuffDrvName], cl
  1412                              <1> fd_init_load_FAT_sectors1:
  1413 00007FD9 C605[6A890100]00    <1> 	mov	byte [FAT_BuffValidData], 0
  1414 00007FE0 A3[6E890100]        <1> 	mov	[FAT_BuffSector], eax
  1415 00007FE5 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1416 00007FE8 BB001C0900          <1>  	mov	ebx, FAT_Buffer
  1417                              <1> 	;movzx	ecx, word [esi+LD_BPB+BPB_FATSz16]
  1418 00007FED 668B4E1C            <1> 	mov	cx, [esi+LD_BPB+BPB_FATSz16]
  1419 00007FF1 662B0D[6E890100]    <1> 	sub	cx, [FAT_BuffSector]
  1420                              <1>         ;cmp	ecx, 3
  1421 00007FF8 6683F903            <1> 	cmp	cx, 3
  1422 00007FFC 7605                <1> 	jna	short fdinit_pass_fix_sector_count_3
  1423                              <1> 	;mov	ecx, 3
  1424 00007FFE B903000000          <1> 	mov	ecx, 3
  1425                              <1> fdinit_pass_fix_sector_count_3:  
  1426 00008003 E81BA30000          <1> 	call	chs_read
  1427 00008008 730D                <1> 	jnc	short fd_init_FAT_sectors_no_load_error
  1428 0000800A C605[6A890100]00    <1> 	mov	byte [FAT_BuffValidData], 0
  1429                              <1> 		; Drv not ready or read Error !
  1430 00008011 B80F000000          <1> 	mov	eax, ERR_DRV_NOT_RDY ; 15
  1431                              <1> 	;xor	edx, edx
  1432 00008016 C3                  <1> 	retn
  1433                              <1> 
  1434                              <1> fd_init_FAT_sectors_no_load_error:
  1435 00008017 C605[6A890100]01    <1> 	mov	byte [FAT_BuffValidData], 1
  1436 0000801E A1[66890100]        <1> 	mov	eax, [FAT_CurrentCluster]
  1437 00008023 E961FFFFFF          <1>         jmp     fd_init_get_next_cluster_readnext
  1438                              <1> 
  1439                              <1> get_FAT_volume_name:
  1440                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1441                              <1> 	; 12/09/2009
  1442                              <1> 	; INPUT ->
  1443                              <1> 	;	BH = Logical DOS drive number (0,1,2,3,4 ...)
  1444                              <1> 	;       BL = 0
  1445                              <1> 	; OUTPUT ->
  1446                              <1> 	;	CF = 0 -> ESI = Volume name address
  1447                              <1> 	; 	CF = 1 -> Root volume name not found
  1448                              <1> 
  1449                              <1> 	;mov 	ah, 0FFh
  1450                              <1> 	;mov 	al, [Last_Dos_DiskNo]
  1451                              <1> 	;cmp 	al, bh
  1452                              <1> 	;jb     short loc_gfvn_dir_load_err
  1453                              <1> 
  1454 00008028 89DE                <1> 	mov	esi, ebx
  1455 0000802A 81E600FF0000        <1> 	and	esi, 0FF00h ; esi = bh
  1456 00008030 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1457 00008036 8A06                <1> 	mov     al, [esi+LD_Name]
  1458 00008038 8A6603              <1> 	mov     ah, [esi+LD_FATType]
  1459 0000803B 80FC01              <1> 	cmp     ah, 1
  1460 0000803E 7210                <1> 	jb    	short loc_gfvn_dir_load_err
  1461 00008040 3C41                <1> 	cmp 	al, 'A'
  1462 00008042 720C                <1> 	jb      short loc_gfvn_dir_load_err
  1463 00008044 80FC02              <1> 	cmp 	ah, 2 
  1464 00008047 7708                <1> 	ja      short get_FAT32_root_cluster
  1465                              <1> 	
  1466 00008049 E8634E0000          <1> 	call    load_FAT_root_directory
  1467 0000804E 730B                <1> 	jnc     short loc_get_volume_name
  1468                              <1> 
  1469                              <1> loc_gfvn_dir_load_err:
  1470 00008050 C3                  <1> 	retn
  1471                              <1> 
  1472                              <1> get_FAT32_root_cluster:
  1473 00008051 8B4632              <1> 	mov	eax, [esi+LD_BPB+BPB_RootClus]
  1474 00008054 E8E34E0000          <1> 	call    load_FAT_sub_directory
  1475 00008059 7224                <1> 	jc	short loc_get_volume_name_retn
  1476                              <1> 
  1477                              <1> loc_get_volume_name:
  1478 0000805B BE00000800          <1>         mov     esi, Directory_Buffer
  1479 00008060 6631C9              <1> 	xor	cx, cx ; 0
  1480                              <1> check_root_volume_name:
  1481 00008063 8A06                <1> 	mov	al, [esi]
  1482 00008065 08C0                <1> 	or      al, al
  1483 00008067 7416                <1> 	jz      short loc_get_volume_name_retn
  1484 00008069 807E0B08            <1> 	cmp     byte [esi+0Bh], 08h
  1485 0000806D 7410                <1> 	je      short loc_get_volume_name_retn
  1486 0000806F 663B0D[7F890100]    <1> 	cmp     cx, [DirBuff_LastEntry]
  1487 00008076 7308                <1> 	jnb     short pass_check_root_volume_name
  1488 00008078 6641                <1> 	inc     cx
  1489 0000807A 83C620              <1> 	add     esi, 32
  1490 0000807D EBE4                <1> 	jmp     short check_root_volume_name
  1491                              <1> 
  1492                              <1> loc_get_volume_name_retn:
  1493 0000807F C3                  <1> 	retn
  1494                              <1>     
  1495                              <1> pass_check_root_volume_name:
  1496 00008080 803D[7B890100]03    <1> 	cmp	byte [DirBuff_FATType], 3
  1497 00008087 7230                <1> 	jb	short loc_get_volume_name_retn_xor
  1498                              <1> 
  1499 00008089 BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1500 0000808E BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1501 00008093 31C0                <1> 	xor	eax, eax
  1502 00008095 8A25[7A890100]      <1> 	mov	ah, [DirBuff_DRV]
  1503 0000809B 80EC41              <1> 	sub	ah, 'A' 
  1504 0000809E 01C6                <1> 	add	esi, eax
  1505 000080A0 A1[81890100]        <1> 	mov	eax, [DirBuff_Cluster]
  1506 000080A5 E8AC4C0000          <1> 	call	get_next_cluster
  1507 000080AA 7305                <1> 	jnc 	short loc_gfvn_load_FAT32_dir_cluster
  1508                              <1>   	
  1509 000080AC 83F801              <1> 	cmp     eax, 1
  1510 000080AF F5                  <1> 	cmc
  1511 000080B0 C3                  <1> 	retn
  1512                              <1>   
  1513                              <1> loc_gfvn_load_FAT32_dir_cluster:
  1514 000080B1 E8864E0000          <1> 	call	load_FAT_sub_directory
  1515 000080B6 73A3                <1> 	jnc	short loc_get_volume_name
  1516 000080B8 C3                  <1> 	retn
  1517                              <1> 
  1518                              <1> loc_get_volume_name_retn_xor:
  1519 000080B9 31C0                <1> 	xor 	eax, eax
  1520 000080BB C3                  <1> 	retn
  1521                              <1> 
  1522                              <1> get_media_change_status:
  1523                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1524                              <1> 	; 09/09/2009
  1525                              <1> 	; INPUT:
  1526                              <1> 	;     DL = Drive number (physical)
  1527                              <1> 	; OUTPUT: clc & AH = 6 media changed
  1528                              <1> 	;     clc & AH = 0 media not changed         
  1529                              <1> 	;     stc -> Drive not ready or an error 
  1530                              <1>   
  1531 000080BC B416                <1> 	mov	ah, 16h
  1532 000080BE E85CD1FFFF          <1>   	call	int13h
  1533 000080C3 80FC06              <1> 	cmp	ah, 06h
  1534 000080C6 7405                <1> 	je	short loc_gmc_status_retn
  1535 000080C8 08E4                <1> 	or	ah, ah
  1536 000080CA 7401                <1> 	jz	short loc_gmc_status_retn
  1537                              <1> loc_gmc_status_stc_retn:    
  1538 000080CC F9                  <1> 	stc
  1539                              <1> loc_gmc_status_retn:
  1540 000080CD C3                  <1> 	retn
  3081                                  %include 'trdosk3.s' ; 06/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - MAIN PROGRAM : trdosk3.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 31/12/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 06/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; MAINPROG.ASM (09/11/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; MAINPROG.ASM [ TRDOS KERNEL - COMMAND EXECUTER SECTION - MAIN PROGRAM ]
    14                              <1> ; (c) 2004-2011  Erdogan TAN  [ 17/01/2004 ]  Last Update: 09/11/2011
    15                              <1> ; CMD_INTR.ASM [ TRDOS Command Interpreter Procedure ] Last Update: 09/11/2011
    16                              <1> ; DIR.ASM [ DIRECTORY FUNCTIONS ] Last Update: 09/10/2011
    17                              <1> ; FILE.ASM [ FILE FUNCTIONS ] Last Update: 09/10/2011
    18                              <1> 
    19                              <1> change_current_drive:
    20                              <1> 	; 16/10/2016
    21                              <1> 	; 02/02/2016
    22                              <1> 	; 15/01/2016 (TRDOS 386 = TRDOS v2.0)
    23                              <1> 	; 18/08/2011
    24                              <1> 	; 09/09/2009
    25                              <1> 	; INPUT:
    26                              <1> 	;   DL = Logical DOS Drive Number
    27                              <1> 	; OUTPUT:
    28                              <1> 	;  cf=1 -> Not successful
    29                              <1> 	;   EAX = Error code
    30                              <1> 	;  cf=0 ->
    31                              <1> 	;   EAX = 0 (successful)
    32                              <1> 
    33 000080CE 31DB                <1> 	xor	ebx, ebx
    34 000080D0 88D7                <1> 	mov	bh, dl
    35                              <1> 
    36                              <1> 	;cmp	dl, 1
    37                              <1> 	;jna	short loc_ccdrv_initial_media_change_check
    38                              <1> 	;cmp	bh, [Last_Dos_DiskNo]
    39                              <1> 	;ja	short loc_ccdrv_drive_not_ready_err
    40                              <1> 
    41                              <1> loc_ccdrv_initial_media_change_check:
    42 000080D2 BE00010900          <1> 	mov	esi, Logical_DOSDisks
    43 000080D7 01DE                <1> 	add	esi, ebx
    44                              <1> loc_ccdrv_dos_drive_name_check:
    45 000080D9 80FA02              <1> 	cmp	dl, 2
    46 000080DC 720F                <1> 	jb	short loc_ccdrv_dos_drive_name_check_ok
    47                              <1> 
    48 000080DE 8A06                <1> 	mov	al, [esi+LD_Name]
    49 000080E0 2C41                <1> 	sub	al, 'A'
    50 000080E2 38D0                <1> 	cmp	al, dl
    51 000080E4 7407                <1> 	je	short loc_ccdrv_dos_drive_name_check_ok
    52                              <1> 
    53                              <1> loc_ccdrv_drive_not_ready_err:
    54                              <1> 	; 16/10/2016 (15h -> 15)
    55 000080E6 B80F000000          <1> 	mov	eax, 15 ; Drive not ready
    56                              <1> loc_change_current_drive_stc_retn:
    57 000080EB F9                  <1> 	stc
    58 000080EC C3                  <1> 	retn  
    59                              <1> 
    60                              <1> loc_ccdrv_dos_drive_name_check_ok:
    61 000080ED 8A667E              <1> 	mov	ah, [esi+LD_MediaChanged]
    62 000080F0 80FC06              <1> 	cmp	ah, 6  ; VOLUME NAME CHECK/MOVE SIGN
    63 000080F3 7455                <1> 	je	short loc_ccdrv_get_FAT_volume_name_0
    64                              <1> 
    65 000080F5 80FA01              <1> 	cmp	dl, 1
    66 000080F8 777D                <1> 	ja	short loc_gmcs_init_drv_hd
    67                              <1> 
    68                              <1> loc_gmcs_init_drv_fd:
    69 000080FA 08E4                <1> 	or	ah, ah 
    70                              <1> 	; AH = 1 is initialization sign (invalid_fd_parameter)
    71 000080FC 7517                <1> 	jnz	short loc_ccdrv_call_fd_init
    72                              <1> 
    73 000080FE E8B9FFFFFF          <1> 	call	get_media_change_status
    74 00008103 72E1                <1> 	jc	short loc_ccdrv_drive_not_ready_err
    75                              <1> 
    76 00008105 20E4                <1> 	and	ah, ah
    77 00008107 7476                <1> 	jz	short loc_change_current_drv3
    78                              <1> 
    79 00008109 80F406              <1> 	xor	ah, 6
    80 0000810C 75D8                <1> 	jnz	short loc_ccdrv_drive_not_ready_err
    81                              <1> 
    82                              <1> loc_ccdrv_call_fd_init_check_vol_id:
    83 0000810E E8440A0000          <1> 	call	get_volume_serial_number
    84 00008113 730D                <1> 	jnc	short loc_ccdrv_check_vol_serial
    85                              <1> 
    86                              <1> loc_ccdrv_call_fd_init:
    87 00008115 E872FCFFFF          <1> 	call	floppy_drv_init
    88 0000811A 731A                <1> 	jnc	short loc_reset_drv_fd_current_dir
    89                              <1> 
    90                              <1> loc_ccdrv_fdinit_fail_retn:
    91                              <1> 	; 16/10/2016
    92 0000811C B80F000000          <1> 	mov	eax, 15 ; Drive not ready
    93 00008121 C3                  <1> 	retn
    94                              <1> 
    95                              <1> loc_ccdrv_check_vol_serial:
    96 00008122 A3[4C820100]        <1> 	mov	[Current_VolSerial], eax
    97                              <1> 	;mov	dl, bh
    98 00008127 E860FCFFFF          <1> 	call	floppy_drv_init
    99 0000812C 72EE                <1> 	jc	short loc_ccdrv_fdinit_fail_retn
   100                              <1> 
   101 0000812E 3B05[4C820100]      <1> 	cmp	eax, [Current_VolSerial]
   102 00008134 7445                <1> 	je	short loc_change_current_drv2
   103                              <1> 
   104                              <1> loc_reset_drv_fd_current_dir:
   105 00008136 31C0                <1> 	xor	eax, eax              
   106 00008138 88467F              <1>         mov	[esi+LD_CDirLevel], al
   107 0000813B 89F7                <1> 	mov	edi, esi
   108 0000813D 81C780000000        <1> 	add	edi, LD_CurrentDirectory
   109 00008143 B920000000          <1> 	mov	ecx, 32
   110 00008148 F3AB                <1> 	rep	stosd   
   111                              <1>  
   112                              <1> loc_ccdrv_get_FAT_volume_name_0:
   113 0000814A 8A4603              <1> 	mov	al, [esi+LD_FATType]
   114 0000814D 08C0                <1> 	or	al, al
   115 0000814F 742A                <1> 	jz	short loc_change_current_drv2
   116                              <1> 
   117 00008151 56                  <1> 	push	esi 
   118 00008152 3C02                <1> 	cmp	al, 2
   119 00008154 7705                <1> 	ja	short loc_ccdrv_get_FAT32_vol_name
   120                              <1>              
   121                              <1> loc_ccdrv_get_FAT2_16_vol_name:
   122 00008156 83C631              <1> 	add	esi, LD_BPB + VolumeLabel
   123 00008159 EB03                <1> 	jmp	short loc_ccdrv_get_FAT_volume_name_1
   124                              <1> 
   125                              <1> loc_ccdrv_get_FAT32_vol_name:
   126 0000815B 83C64D              <1> 	add	esi, LD_BPB + FAT32_VolLab
   127                              <1> loc_ccdrv_get_FAT_volume_name_1:
   128 0000815E 53                  <1> 	push	ebx
   129 0000815F 56                  <1> 	push	esi
   130 00008160 E8C3FEFFFF          <1> 	call	get_FAT_volume_name
   131 00008165 5F                  <1> 	pop	edi
   132 00008166 5B                  <1> 	pop	ebx
   133                              <1> 	; BL = 0
   134 00008167 720B                <1> 	jc	short loc_change_current_drv1
   135 00008169 20C0                <1> 	and	al, al
   136 0000816B 7407                <1> 	jz	short loc_change_current_drv1
   137                              <1> 
   138                              <1> loc_ccdrv_move_FAT_volume_name:
   139 0000816D B90B000000          <1> 	mov	ecx, 11
   140 00008172 F3A4                <1> 	rep	movsb
   141                              <1> 
   142                              <1> loc_change_current_drv1:
   143 00008174 5E                  <1> 	pop	esi
   144 00008175 EB04                <1> 	jmp	short loc_change_current_drv2
   145                              <1> 
   146                              <1> loc_gmcs_init_drv_hd:
   147 00008177 08E4                <1> 	or	ah, ah
   148 00008179 7404                <1> 	jz	short loc_change_current_drv3
   149                              <1> 	; BL = 0, BH = Logical DOS drive number
   150                              <1> loc_change_current_drv2:
   151 0000817B C6467E00            <1> 	mov	byte [esi+LD_MediaChanged], 0
   152                              <1> loc_change_current_drv3:
   153 0000817F 883D[56820100]      <1> 	mov	[Current_Drv], bh
   154                              <1> 
   155                              <1> 	;call	restore_current_directory
   156                              <1> 	;retn
   157                              <1> 
   158                              <1> restore_current_directory:
   159                              <1> 	; 11/02/2016
   160                              <1> 	; 15/01/2016 (TRDOS 386 = TRDOS v2.0)
   161                              <1> 	; 25/01/2010
   162                              <1> 	; 12/10/2009
   163                              <1> 	;
   164                              <1> 	; INPUT:
   165                              <1> 	;   ESI = Logical DOS Drive Description Table
   166                              <1> 	;
   167                              <1> 	; OUTPUT:
   168                              <1> 	;   ESI = Logical DOS Drive Description Table
   169                              <1> 	;   EDI = offset Current_Dir_Drv 
   170                              <1> 
   171 00008185 8A4603              <1> 	mov	al, [esi+LD_FATType]
   172 00008188 A2[55820100]        <1> 	mov	[Current_FATType], al
   173                              <1> 
   174 0000818D 8A26                <1> 	mov	ah, [esi+LD_Name] 
   175 0000818F 8825[57820100]      <1> 	mov	[Current_Dir_Drv], ah
   176                              <1> 
   177 00008195 20C0                <1> 	and	al, al
   178 00008197 741D                <1> 	jz	short loc_restore_FS_current_directory
   179                              <1> 
   180                              <1> loc_restore_FAT_current_directory:
   181 00008199 8A667F              <1> 	mov	ah, [esi+LD_CDirLevel]
   182 0000819C 8825[54820100]      <1> 	mov	[Current_Dir_Level], ah
   183 000081A2 08E4                <1> 	or	ah, ah
   184 000081A4 7416                <1>         jz	short loc_ccdrv_reset_cdir_FAT_12_16_32_fcluster
   185                              <1> 
   186 000081A6 0FB6D4              <1> 	movzx	edx, ah
   187 000081A9 C0E204              <1> 	shl	dl, 4 ; * 16
   188 000081AC 01F2                <1>         add	edx, esi
   189 000081AE 8B828C000000        <1> 	mov	eax, [edx+LD_CurrentDirectory+12]
   190 000081B4 EB2C                <1> 	jmp	short loc_ccdrv_reset_cdir_FAT_fcluster
   191                              <1> 
   192                              <1> loc_restore_FS_current_directory:
   193 000081B6 E8BC4D0000          <1> 	call	load_current_FS_directory 
   194 000081BB C3                  <1> 	retn 
   195                              <1> 
   196                              <1> loc_ccdrv_reset_cdir_FAT_12_16_32_fcluster:
   197 000081BC 3C03                <1> 	cmp	al, 3
   198 000081BE 7205                <1> 	jb	short loc_ccdrv_reset_cdir_FAT_12_16_fcluster
   199                              <1> loc_ccdrv_reset_cdir_FAT32_fcluster:
   200 000081C0 8B4632              <1> 	mov	eax, [esi+LD_BPB+FAT32_RootFClust]
   201 000081C3 EB04                <1> 	jmp	short loc_ccdrv_check_rootdir_sign
   202                              <1> loc_ccdrv_reset_cdir_FAT_12_16_fcluster:   
   203 000081C5 30C0                <1> 	xor	al, al  ; xor eax, eax
   204 000081C7 31D2                <1> 	xor	edx, edx
   205                              <1> loc_ccdrv_check_rootdir_sign:
   206 000081C9 80BE8000000000      <1> 	cmp	byte [esi+LD_CurrentDirectory], 0
   207 000081D0 7510                <1> 	jne	short loc_ccdrv_reset_cdir_FAT_fcluster
   208                              <1> loc_ccdrv_set_rootdir_FAT_fcluster:
   209 000081D2 89868C000000        <1>         mov     [esi+LD_CurrentDirectory+12], eax
   210 000081D8 C78680000000524F4F- <1> 	mov	dword [esi+LD_CurrentDirectory], 'ROOT'
   210 000081E1 54                  <1>
   211                              <1> 
   212                              <1> loc_ccdrv_reset_cdir_FAT_fcluster:
   213 000081E2 A3[50820100]        <1> 	mov	[Current_Dir_FCluster], eax
   214                              <1> 
   215 000081E7 BF[B3890100]        <1> 	mov	edi, PATH_Array
   216 000081EC 89F2                <1> 	mov	edx, esi
   217 000081EE 81C680000000        <1> 	add	esi, LD_CurrentDirectory
   218 000081F4 B920000000          <1> 	mov	ecx, 32
   219 000081F9 F3A5                <1> 	rep	movsd
   220                              <1> 
   221 000081FB E84C2D0000          <1> 	call	change_prompt_dir_string
   222                              <1> 	
   223 00008200 89D6                <1> 	mov	esi, edx
   224                              <1> 	
   225 00008202 29C0                <1>         sub	eax, eax
   226                              <1>        ;sub	edx, edx
   227 00008204 BF[57820100]        <1> 	mov	edi, Current_Dir_Drv
   228                              <1> 
   229 00008209 A2[23380100]        <1> 	mov	[Restore_CDIR], al ; 0
   230 0000820E C3                  <1> 	retn
   231                              <1> 
   232                              <1> dos_prompt:
   233                              <1> 	; 06/05/2016
   234                              <1> 	; 30/01/2016
   235                              <1> 	; 29/01/2016
   236                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   237                              <1> 	; 15/09/2011
   238                              <1> 	; 13/09/2009
   239                              <1> 	; 2004-2005
   240                              <1> 
   241                              <1> 	; 06/05/2016
   242 0000820F C705[108E0100]-     <1> 	mov	dword [mainprog_return_addr], return_from_cmd_interpreter
   242 00008215 [C3820000]          <1>
   243                              <1> 
   244                              <1> loc_TRDOS_prompt:
   245 00008219 BF[56830100]        <1> 	mov	edi, TextBuffer
   246 0000821E C6075B              <1> 	mov	byte [edi], "["
   247 00008221 47                  <1> 	inc	edi
   248 00008222 BE[76380100]        <1> 	mov	esi, TRDOSPromptLabel
   249                              <1> get_next_prompt_label_char:
   250 00008227 803E20              <1> 	cmp	byte [esi], 20h
   251 0000822A 7203                <1> 	jb	short pass_prompt_label
   252 0000822C A4                  <1> 	movsb
   253 0000822D EBF8                <1> 	jmp	short get_next_prompt_label_char
   254                              <1> pass_prompt_label:
   255 0000822F C6075D              <1> 	mov	byte [edi], "]"
   256 00008232 47                  <1> 	inc	edi
   257 00008233 C60720              <1> 	mov	byte [edi], 20h
   258 00008236 47                  <1> 	inc	edi
   259 00008237 BE[57820100]        <1> 	mov	esi, Current_Dir_Drv
   260 0000823C 66A5                <1> 	movsw
   261 0000823E A4                  <1> 	movsb 
   262                              <1> loc_prompt_current_directory:
   263 0000823F 803E20              <1> 	cmp	byte [esi], 20h
   264 00008242 7203                <1> 	jb	short pass_prompt_current_directory
   265 00008244 A4                  <1> 	movsb
   266 00008245 EBF8                <1> 	jmp	short loc_prompt_current_directory  
   267                              <1> pass_prompt_current_directory:
   268 00008247 C6073E              <1> 	mov	byte [edi], '>'
   269 0000824A 47                  <1> 	inc	edi
   270 0000824B C60700              <1> 	mov	byte [edi], 0  
   271 0000824E BE[56830100]        <1> 	mov	esi, TextBuffer
   272 00008253 E8EDF2FFFF          <1> 	call	print_msg
   273                              <1>         
   274                              <1> 	;sub	bh, bh ; video page = 0
   275                              <1> 	;call	get_cpos ; get cursor position
   276 00008258 668B15[AE810100]    <1> 	mov	dx, [CURSOR_POSN] ; video page 0
   277 0000825F 8815[B6820100]      <1> 	mov	[CursorColumn], dl
   278                              <1> 
   279                              <1> 	; 30/01/2016 (to show cursor on the row, again)
   280                              <1> 	; (Initial color attributes of video page 0 is 0)
   281                              <1> 	; (see: 'StartPMP' in trdos386.s)
   282                              <1> 	; 
   283                              <1> 	;mov	edi, 0B8000h ; start of video page 0
   284                              <1> 	;movzx	ecx, dl ; column	 
   285                              <1> 	;mov	al, 80
   286                              <1> 	;mul	dh
   287                              <1> 	;add	ax, cx
   288                              <1> 	;shl	ax, 1 ; character + attribute
   289                              <1> 	;add	di, ax ; (2*80*row) + (2*column)
   290                              <1> 	;neg	cl
   291                              <1> 	;add	cl, 80
   292                              <1> 	;mov	ax, 700h ;  ah = 7 (color attribute)
   293                              <1> 	;rep	stosw	
   294                              <1> 
   295                              <1> loc_rw_char:
   296 00008265 E899000000          <1> 	call	rw_char
   297                              <1> loc_move_command:
   298 0000826A BE[06830100]        <1> 	mov	esi, CommandBuffer
   299 0000826F 89F7                <1> 	mov	edi, esi
   300 00008271 31C9                <1> 	xor	ecx, ecx
   301                              <1> first_command_char:
   302 00008273 AC                  <1> 	lodsb
   303 00008274 3C20                <1> 	cmp	al, 20h
   304 00008276 772E                <1> 	ja	short pass_space_control
   305 00008278 7241                <1> 	jb	short loc_move_cmd_arguments_ok
   306 0000827A 81FE[55830100]      <1> 	cmp	esi, CommandBuffer + 79
   307 00008280 72F1                <1> 	jb	short first_command_char
   308 00008282 EB37                <1> 	jmp	short loc_move_cmd_arguments_ok
   309                              <1> 
   310                              <1> next_command_char:
   311 00008284 AC                  <1> 	lodsb
   312 00008285 3C20                <1> 	cmp	al, 20h
   313 00008287 771D                <1> 	ja	short pass_space_control
   314 00008289 7230                <1> 	jb	short loc_move_cmd_arguments_ok
   315                              <1> 
   316                              <1> loc_1st_cmd_arg: ; 30/01/2016
   317 0000828B AC                  <1> 	lodsb
   318 0000828C 3C20                <1> 	cmp	al, 20h
   319 0000828E 74FB                <1> 	je	short loc_1st_cmd_arg
   320 00008290 7229                <1> 	jb	short loc_move_cmd_arguments_ok
   321                              <1> 	
   322 00008292 C60700              <1>         mov     byte [edi], 0
   323 00008295 47                  <1> 	inc	edi
   324                              <1> 
   325                              <1> loc_move_cmd_arguments:
   326 00008296 AA                  <1> 	stosb
   327 00008297 81FE[55830100]      <1> 	cmp	esi, CommandBuffer + 79
   328 0000829D 731C                <1> 	jnb	short loc_move_cmd_arguments_ok
   329 0000829F AC                  <1>         lodsb
   330 000082A0 3C20                <1> 	cmp	al, 20h
   331 000082A2 73F2                <1> 	jnb	short loc_move_cmd_arguments
   332 000082A4 EB15                <1> 	jmp	short loc_move_cmd_arguments_ok
   333                              <1> 
   334                              <1> pass_space_control:
   335 000082A6 3C61                <1> 	cmp	al, 61h
   336 000082A8 7206                <1> 	jb	short pass_capitalize
   337 000082AA 3C7A                <1> 	cmp	al, 7Ah
   338 000082AC 7702                <1> 	ja	short pass_capitalize
   339 000082AE 24DF                <1> 	and	al, 0DFh
   340                              <1> pass_capitalize:
   341 000082B0 AA                  <1> 	stosb   
   342 000082B1 FEC1                <1> 	inc     cl
   343 000082B3 81FE[55830100]      <1>         cmp     esi, CommandBuffer + 79
   344 000082B9 72C9                <1> 	jb      short next_command_char 
   345                              <1> 
   346                              <1> loc_move_cmd_arguments_ok:
   347 000082BB C60700              <1>         mov     byte [edi], 0
   348                              <1> 
   349                              <1> call_command_interpreter:
   350 000082BE E8CF080000          <1> 	call    command_interpreter
   351                              <1> 
   352                              <1> return_from_cmd_interpreter:
   353 000082C3 B950000000          <1>         mov	ecx, 80
   354                              <1> 	;mov	cx, 80
   355 000082C8 BF[06830100]        <1> 	mov	edi, CommandBuffer
   356 000082CD 30C0                <1> 	xor	al, al
   357 000082CF F3AA                <1> 	rep	stosb
   358                              <1> 	;cmp	byte [Program_Exit], 0
   359                              <1> 	;ja	short loc_terminate_trdos
   360                              <1>         
   361                              <1> 	; 16/01/2016
   362 000082D1 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 3 ; 80*25 color
   363 000082D8 741D                <1> 	je	short pass_set_txt_mode
   364                              <1> 
   365 000082DA E88798FFFF          <1> 	call	set_txt_mode ; set vide mode to 03h
   366                              <1> 	; 07/01/2017
   367 000082DF 30C0                <1> 	xor	al, al
   368                              <1> 
   369                              <1> loc_check_active_page:
   370                              <1> 	;xor	al, al
   371 000082E1 3805[BE810100]      <1> 	cmp	[ACTIVE_PAGE], al ; 0
   372 000082E7 0F842CFFFFFF        <1>         je      loc_TRDOS_prompt 
   373                              <1> 	; AL = 0 = video page 0
   374 000082ED E8BD9CFFFF          <1> 	call	set_active_page
   375 000082F2 E922FFFFFF          <1>         jmp     loc_TRDOS_prompt ; infinitive loop
   376                              <1> 
   377                              <1> pass_set_txt_mode: 
   378 000082F7 BE[BF440100]        <1> 	mov	esi, nextline
   379 000082FC E844F2FFFF          <1> 	call	print_msg
   380 00008301 EBDE                <1> 	jmp     short loc_check_active_page
   381                              <1> 
   382                              <1> rw_char:
   383                              <1> 	; 13/05/2016
   384                              <1> 	; 30/01/2016
   385                              <1> 	; 29/01/2016
   386                              <1> 	; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
   387                              <1> 	; 2004-2005
   388                              <1> 	
   389                              <1> 	; DH = cursor row, DL = cursor column
   390                              <1> 	; BH = 0 = video page number (active page)
   391                              <1> 
   392                              <1> 	;xor	bh, bh ; 0 = video page 0
   393                              <1> 
   394                              <1> readnextchar:
   395 00008303 30E4                <1> 	xor     ah, ah
   396 00008305 E8DB8BFFFF          <1> 	call	int16h
   397 0000830A 20C0                <1> 	and	al, al
   398 0000830C 7432                <1> 	jz	short loc_arrow    
   399 0000830E 3CE0                <1> 	cmp	al, 0E0h          
   400 00008310 742E                <1> 	je	short loc_arrow
   401 00008312 3C08                <1> 	cmp	al, 08h             
   402 00008314 7542                <1> 	jne	short char_return
   403                              <1> loc_back:
   404 00008316 3A15[B6820100]      <1> 	cmp	dl, [CursorColumn]
   405 0000831C 76E5                <1> 	jna     short readnextchar
   406                              <1> prev_column:
   407 0000831E FECA                <1> 	dec	dl
   408                              <1> set_cursor_pos:
   409                              <1> 	;push	dx
   410 00008320 52                  <1> 	push	edx ; 29/12/2017
   411                              <1> 	;xor	bh, bh ; 0 = video page 0
   412                              <1> 	; DH = Row, DL = Column
   413 00008321 E871A0FFFF          <1> 	call	_set_cpos ; 17/01/2016
   414 00008326 5A                  <1>         pop	edx ; 29/12/2017
   415                              <1> 	;pop	dx
   416                              <1> 	;movzx	ebx, dl
   417 00008327 88D3                <1> 	mov	bl, dl
   418 00008329 2A1D[B6820100]      <1> 	sub	bl, [CursorColumn] 
   419 0000832F B020                <1> 	mov	al, 20h
   420 00008331 8883[06830100]      <1> 	mov	[CommandBuffer+ebx], al
   421                              <1> 	;sub	bh, bh ; video page 0
   422                              <1> 	;mov	cx, 1
   423 00008337 B307                <1> 	mov	bl, 7 ; color attribute
   424 00008339 E8389FFFFF          <1> 	call	_write_c_current ; 17/01/2016
   425                              <1> 	;mov	dx, [CURSOR_POSN]
   426 0000833E EBC3                <1> 	jmp	short readnextchar
   427                              <1> loc_arrow:    
   428 00008340 80FC4B              <1> 	cmp	ah, 4Bh
   429 00008343 74D1                <1> 	je	short loc_back
   430 00008345 80FC53              <1> 	cmp	ah, 53h
   431 00008348 74CC                <1> 	je      short loc_back
   432 0000834A 80FC4D              <1> 	cmp	ah, 4Dh
   433 0000834D 75B4                <1> 	jne	short readnextchar
   434 0000834F 80FA4F              <1> 	cmp	dl, 79
   435 00008352 73AF                <1> 	jnb	short readnextchar
   436 00008354 FEC2                <1> 	inc	dl
   437 00008356 EBC8                <1> 	jmp	short set_cursor_pos
   438                              <1> char_return:
   439 00008358 0FB6DA              <1> 	movzx	ebx, dl
   440 0000835B 2A1D[B6820100]      <1> 	sub	bl, [CursorColumn] 
   441 00008361 3C20                <1> 	cmp	al, 20h
   442 00008363 721D                <1> 	jb	short loc_escape
   443 00008365 8883[06830100]      <1> 	mov	[CommandBuffer+ebx], al
   444 0000836B 80FA4F              <1> 	cmp	dl, 79
   445 0000836E 7393                <1> 	jnb	short readnextchar
   446 00008370 66BB0700            <1> 	mov	bx, 7 ; color attribute
   447 00008374 E8849FFFFF          <1> 	call	_write_tty
   448 00008379 668B15[AE810100]    <1> 	mov	dx, [CURSOR_POSN] ; video page 0
   449 00008380 EB81                <1>         jmp     readnextchar
   450                              <1> loc_escape:
   451 00008382 3C1B                <1> 	cmp	al, 1Bh
   452 00008384 7418                <1> 	je	short rw_char_retn
   453                              <1> 	;
   454 00008386 3C0D                <1> 	cmp	al, 0Dh ; CR
   455 00008388 0F8575FFFFFF        <1>         jne     readnextchar
   456                              <1> 	; 13/05/2016
   457 0000838E 66BB0700            <1> 	mov	bx, 7 ; attribute/color (bl)
   458                              <1> 		      ; video page 0 (bh=0)	
   459 00008392 E8669FFFFF          <1> 	call	_write_tty
   460                              <1> 	;mov	bx, 7  ; attribute/color
   461                              <1> 		      ; video page 0 (bh=0)
   462 00008397 B00A                <1> 	mov	al, 0Ah ; LF
   463 00008399 E85F9FFFFF          <1> 	call	_write_tty
   464                              <1> rw_char_retn:
   465 0000839E C3                  <1> 	retn
   466                              <1> 
   467                              <1> show_date:
   468                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   469                              <1>         ; 2004-2005
   470                              <1> 
   471                              <1> 	;mov	ah, 04h
   472                              <1> 	;call	int1Ah
   473 0000839F E86DE7FFFF          <1> 	call	RTC_40	; GET RTC DATE
   474                              <1> 
   475 000083A4 88D0                <1> 	mov	al, dl
   476 000083A6 E82D8BFFFF          <1>   	call	bcd_to_ascii
   477 000083AB 66A3[62390100]      <1> 	mov	[Day], ax
   478                              <1> 
   479 000083B1 88F0                <1> 	mov	al, dh
   480 000083B3 E8208BFFFF          <1>   	call	bcd_to_ascii
   481 000083B8 66A3[65390100]      <1> 	mov	[Month], ax
   482                              <1> 
   483 000083BE 88E8                <1> 	mov	al, ch
   484 000083C0 E8138BFFFF          <1>   	call	bcd_to_ascii
   485 000083C5 66A3[68390100]      <1> 	mov	[Century], ax
   486                              <1> 
   487 000083CB 88C8                <1> 	mov	al, cl
   488 000083CD E8068BFFFF          <1>   	call	bcd_to_ascii
   489 000083D2 66A3[6A390100]      <1> 	mov	word [Year], ax
   490                              <1> 
   491 000083D8 BE[52390100]        <1> 	mov	esi, Msg_Show_Date
   492 000083DD E863F1FFFF          <1> 	call	print_msg
   493                              <1> 
   494 000083E2 C3                  <1> 	retn
   495                              <1> 
   496                              <1> set_date:
   497                              <1> 	; 13/05/2016
   498                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   499                              <1>         ; 2004-2005
   500                              <1> 
   501 000083E3 BE[36390100]        <1> 	mov	esi, Msg_Enter_Date
   502 000083E8 E858F1FFFF          <1> 	call	print_msg
   503                              <1> 
   504                              <1> loc_enter_day_1:
   505 000083ED 30E4                <1> 	xor     ah, ah
   506 000083EF E8F18AFFFF          <1> 	call	int16h
   507                              <1> 	; AL = ASCII Code of the Character
   508 000083F4 3C0D                <1> 	cmp	al, 13
   509 000083F6 0F84B7010000        <1> 	je	loc_set_date_retn
   510 000083FC 3C1B                <1> 	cmp	al, 27
   511 000083FE 0F84AF010000        <1> 	je	loc_set_date_retn
   512 00008404 A2[62390100]        <1> 	mov	[Day], al
   513 00008409 3C30                <1> 	cmp	al, '0'
   514 0000840B 0F82AD010000        <1> 	jb	loc_set_date_stc_0
   515 00008411 3C33                <1> 	cmp	al, '3'
   516 00008413 0F87A5010000        <1> 	ja	loc_set_date_stc_0
   517                              <1> 	; 13/05/2016
   518                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   519                              <1> 		      ; video page 0 (bh)	
   520 00008419 B307                <1> 	mov	bl, 7
   521 0000841B E8DD9EFFFF          <1> 	call	_write_tty
   522                              <1> loc_enter_day_2:
   523 00008420 30E4                <1> 	xor     ah, ah
   524 00008422 E8BE8AFFFF          <1> 	call	int16h
   525                              <1> 	; AL = ASCII Code of the Character
   526 00008427 3C1B                <1> 	cmp	al, 27
   527 00008429 0F8484010000        <1>         je      loc_set_date_retn
   528 0000842F A2[63390100]        <1> 	mov	[Day+1], al
   529 00008434 3C30                <1> 	cmp	al, '0'
   530 00008436 0F828C010000        <1>         jb      loc_set_date_stc_1
   531 0000843C 3C39                <1> 	cmp	al, '9'
   532 0000843E 0F8784010000        <1>         ja      loc_set_date_stc_1
   533 00008444 803D[62390100]33    <1> 	cmp	byte [Day], '3'
   534 0000844B 7208                <1> 	jb	short pass_set_day_31
   535 0000844D 3C31                <1> 	cmp	al, '1'
   536 0000844F 0F8773010000        <1>         ja      loc_set_date_stc_1
   537                              <1> pass_set_day_31:
   538                              <1> 	; 13/05/2016
   539                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   540                              <1> 		      ; video page 0 (bh)	
   541 00008455 B307                <1> 	mov	bl, 7
   542 00008457 E8A19EFFFF          <1> 	call	_write_tty
   543                              <1> loc_enter_separator_1:
   544 0000845C 28E4                <1> 	sub     ah, ah ; 0
   545 0000845E E8828AFFFF          <1> 	call	int16h
   546                              <1> 	; AL = ASCII Code of the Character
   547 00008463 3C1B                <1> 	cmp	al, 27
   548 00008465 0F8448010000        <1>         je      loc_set_date_retn
   549 0000846B 3C2D                <1> 	cmp	al, '-'
   550 0000846D 7408                <1> 	je	short pass_set_date_separator_1
   551 0000846F 3C2F                <1> 	cmp	al, '/'
   552 00008471 0F856C010000        <1>         jne     loc_set_date_stc_2
   553                              <1> pass_set_date_separator_1:
   554                              <1> 	; 13/05/2016
   555                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   556                              <1> 		      ; video page 0 (bh)
   557 00008477 B307                <1> 	mov	bl, 7	
   558 00008479 E87F9EFFFF          <1> 	call	_write_tty
   559                              <1> loc_enter_month_1:
   560 0000847E 30E4                <1> 	xor     ah, ah ; 0
   561 00008480 E8608AFFFF          <1> 	call	int16h
   562                              <1> 	; AL = ASCII Code of the Character
   563 00008485 3C1B                <1> 	cmp	al, 27
   564 00008487 0F8426010000        <1>         je      loc_set_date_retn
   565 0000848D A2[65390100]        <1> 	mov	[Month], al
   566 00008492 3C30                <1> 	cmp	al, '0'
   567 00008494 0F8264010000        <1>         jb      loc_set_date_stc_3
   568 0000849A 3C31                <1> 	cmp	al, '1'
   569 0000849C 0F875C010000        <1>         ja      loc_set_date_stc_3
   570                              <1> 	; 13/05/2016
   571                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   572                              <1> 		      ; video page 0 (bh)	
   573 000084A2 B307                <1> 	mov	bl, 7
   574 000084A4 E8549EFFFF          <1> 	call	_write_tty
   575                              <1> loc_enter_month_2:
   576 000084A9 30E4                <1> 	xor     ah, ah
   577 000084AB E8358AFFFF          <1> 	call	int16h
   578                              <1> 	; AL = ASCII Code of the Character
   579 000084B0 3C1B                <1> 	cmp	al, 27
   580 000084B2 0F84FB000000        <1>         je      loc_set_date_retn
   581 000084B8 A2[66390100]        <1> 	mov	[Month+1], al
   582 000084BD 3C30                <1> 	cmp	al, '0'
   583 000084BF 0F8254010000        <1>         jb      loc_set_date_stc_4
   584 000084C5 3C39                <1> 	cmp	al, '9'
   585 000084C7 0F874C010000        <1>         ja      loc_set_date_stc_4
   586 000084CD 803D[65390100]31    <1> 	cmp	byte [Month], '1'
   587 000084D4 7208                <1> 	jb	short pass_set_month_12
   588 000084D6 3C32                <1> 	cmp	al, '2'
   589 000084D8 0F873B010000        <1>         ja      loc_set_date_stc_4
   590                              <1> pass_set_month_12:
   591                              <1> 	; 13/05/2016
   592                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   593                              <1> 		      ; video page 0 (bh)
   594 000084DE B307                <1> 	mov	bl, 7	
   595 000084E0 E8189EFFFF          <1> 	call	_write_tty
   596                              <1> loc_enter_separator_2:
   597 000084E5 28E4                <1> 	sub     ah, ah
   598 000084E7 E8F989FFFF          <1> 	call	int16h
   599                              <1> 	; AL = ASCII Code of the Character
   600 000084EC 3C1B                <1> 	cmp	al, 27
   601 000084EE 0F84BF000000        <1>         je      loc_set_date_retn
   602 000084F4 3C2D                <1> 	cmp	al, '-'
   603 000084F6 7408                <1> 	je	short pass_set_date_separator_2
   604 000084F8 3C2F                <1> 	cmp	al, '/'
   605 000084FA 0F8534010000        <1>         jne     loc_set_date_stc_5
   606                              <1> pass_set_date_separator_2:
   607                              <1> 	; 13/05/2016
   608                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   609                              <1> 		      ; video page 0 (bh)	
   610 00008500 B307                <1> 	mov	bl, 7
   611 00008502 E8F69DFFFF          <1> 	call	_write_tty
   612                              <1> loc_enter_year_1:
   613 00008507 30E4                <1> 	xor    ah, ah
   614 00008509 E8D789FFFF          <1> 	call	int16h
   615                              <1> 	; AL = ASCII Code of the Character
   616 0000850E 3C1B                <1> 	cmp	al, 27
   617 00008510 0F849D000000        <1>         je      loc_set_date_retn
   618 00008516 A2[6A390100]        <1> 	mov	[Year], al
   619 0000851B 3C30                <1> 	cmp	al, '0'
   620 0000851D 0F822C010000        <1>         jb      loc_set_date_stc_6
   621 00008523 3C39                <1> 	cmp	al, '9'
   622 00008525 0F8724010000        <1>         ja      loc_set_date_stc_6
   623                              <1> 	; 13/05/2016
   624                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   625                              <1> 		      ; video page 0 (bh)
   626 0000852B B307                <1> 	mov	bl, 7	
   627 0000852D E8CB9DFFFF          <1> 	call	_write_tty
   628                              <1> loc_enter_year_2:
   629 00008532 30E4                <1> 	xor	ah, ah
   630 00008534 E8AC89FFFF          <1> 	call	int16h
   631                              <1> 	; AL = ASCII Code of the Character
   632 00008539 3C1B                <1> 	cmp	al, 27
   633 0000853B 7476                <1> 	je	short loc_set_date_retn
   634 0000853D A2[6B390100]        <1> 	mov	byte [Year+1], al
   635 00008542 3C30                <1> 	cmp	al, '0'
   636 00008544 0F8220010000        <1>         jb      loc_set_date_stc_7
   637 0000854A 3C39                <1> 	cmp	al, '9'
   638 0000854C 0F8718010000        <1>         ja      loc_set_date_stc_7
   639                              <1> 	; 13/05/2016
   640                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   641                              <1> 		      ; video page 0 (bh)
   642 00008552 B307                <1> 	mov	bl, 7	
   643 00008554 E8A49DFFFF          <1> 	call	_write_tty
   644                              <1> loc_set_date_get_lchar_again:
   645 00008559 28E4                <1> 	sub	ah, ah ; 0
   646 0000855B E88589FFFF          <1> 	call	int16h
   647                              <1> 	; AL = ASCII Code of the Character
   648 00008560 3C0D                <1> 	cmp	al, 13 ; ENTER key
   649 00008562 7412                <1> 	je	short loc_set_date_progress
   650 00008564 3C1B                <1> 	cmp	al, 27 ; ESC key
   651 00008566 744B                <1> 	je	short loc_set_date_retn
   652                              <1> 	;
   653 00008568 E82A010000          <1> 	call	check_for_backspace
   654 0000856D 75EA                <1> 	jne	short loc_set_date_get_lchar_again
   655                              <1> 
   656                              <1> loc_set_date_bs_8:
   657 0000856F E811010000          <1> 	call	write_backspace
   658 00008574 EBBC                <1> 	jmp	short loc_enter_year_2
   659                              <1> 
   660                              <1> loc_set_date_progress:
   661                              <1> 	; Get Current Date
   662                              <1> 	;mov	ah, 04h
   663                              <1> 	;call	int1Ah
   664 00008576 E896E5FFFF          <1> 	call	RTC_40	; GET RTC DATE
   665                              <1> 	; CH = century (in BCD)
   666                              <1> 
   667 0000857B 66A1[6A390100]      <1> 	mov	ax, [Year]
   668 00008581 662D3030            <1> 	sub	ax, '00'
   669 00008585 C0E004              <1> 	shl	al, 4 ; * 16
   670 00008588 88C1                <1> 	mov	cl, al
   671 0000858A 00E1                <1> 	add	cl, ah
   672 0000858C 66A1[65390100]      <1> 	mov	ax, [Month]
   673 00008592 662D3030            <1> 	sub	ax, '00'
   674 00008596 C0E004              <1> 	shl	al, 4 ; * 16
   675 00008599 88C6                <1> 	mov	dh, al
   676 0000859B 00E6                <1> 	add	dh, ah
   677 0000859D 66A1[62390100]      <1> 	mov	ax, [Day]
   678 000085A3 662D3030            <1> 	sub	ax, '00'
   679 000085A7 C0E004              <1> 	shl	al, 4 ; * 16
   680 000085AA 88C2                <1> 	mov	dl, al
   681 000085AC 00E2                <1> 	add	dl, ah
   682                              <1> 
   683                              <1> 	;mov	ah, 05h
   684                              <1> 	;call	int1Ah
   685 000085AE E88BE5FFFF          <1> 	call	RTC_50	; SET RTC DATE
   686                              <1> 
   687                              <1> loc_set_date_retn:
   688 000085B3 BE[BF440100]        <1> 	mov	esi, nextline
   689 000085B8 E888EFFFFF          <1> 	call	print_msg
   690 000085BD C3                  <1> 	retn
   691                              <1> 
   692                              <1> loc_set_date_stc_0:
   693                              <1> 	;xor	bh, bh ; video page 0
   694 000085BE E81E9EFFFF          <1> 	call	beeper ; BEEP !
   695 000085C3 E925FEFFFF          <1>         jmp     loc_enter_day_1
   696                              <1> loc_set_date_stc_1:
   697 000085C8 E8CA000000          <1> 	call	check_for_backspace
   698 000085CD 740A                <1> 	je	short loc_set_date_bs_1
   699                              <1> 	;xor	bh, bh ; video page 0
   700 000085CF E80D9EFFFF          <1> 	call	beeper ; BEEP !
   701 000085D4 E947FEFFFF          <1>         jmp     loc_enter_day_2
   702                              <1> loc_set_date_bs_1:
   703 000085D9 E8A7000000          <1> 	call	write_backspace
   704 000085DE E90AFEFFFF          <1>         jmp     loc_enter_day_1
   705                              <1> loc_set_date_stc_2:
   706 000085E3 E8AF000000          <1> 	call	check_for_backspace
   707 000085E8 740A                <1> 	je	short loc_set_date_bs_2
   708                              <1> 	;xor	bh, bh ; video page 0
   709 000085EA E8F29DFFFF          <1> 	call	beeper ; BEEP !
   710 000085EF E968FEFFFF          <1>         jmp     loc_enter_separator_1
   711                              <1> loc_set_date_bs_2:
   712 000085F4 E88C000000          <1> 	call	write_backspace
   713 000085F9 E922FEFFFF          <1>         jmp     loc_enter_day_2
   714                              <1> loc_set_date_stc_3:
   715 000085FE E894000000          <1> 	call	check_for_backspace	
   716 00008603 740A                <1> 	je short loc_set_date_bs_3
   717                              <1> 	;xor	bh, bh ; video page 0
   718 00008605 E8D79DFFFF          <1> 	call	beeper ; BEEP !
   719 0000860A E96FFEFFFF          <1>         jmp     loc_enter_month_1
   720                              <1> loc_set_date_bs_3:
   721 0000860F E871000000          <1> 	call	write_backspace
   722 00008614 E943FEFFFF          <1>         jmp     loc_enter_separator_1
   723                              <1> loc_set_date_stc_4:
   724 00008619 E879000000          <1> 	call	check_for_backspace	
   725 0000861E 740A                <1> 	je	short loc_set_date_bs_4
   726                              <1> 	;xor	bh, bh ; video page 0
   727 00008620 E8BC9DFFFF          <1> 	call	beeper ; BEEP !
   728 00008625 E97FFEFFFF          <1>         jmp     loc_enter_month_2
   729                              <1> loc_set_date_bs_4:
   730 0000862A E856000000          <1> 	call	write_backspace
   731 0000862F E94AFEFFFF          <1>         jmp     loc_enter_month_1
   732                              <1> loc_set_date_stc_5:
   733 00008634 E85E000000          <1> 	call	check_for_backspace
   734 00008639 740A                <1> 	je	short loc_set_date_bs_5
   735                              <1> 	;xor	bh, bh ; video page 0
   736 0000863B E8A19DFFFF          <1> 	call	beeper ; BEEP !
   737 00008640 E9A0FEFFFF          <1>         jmp     loc_enter_separator_2
   738                              <1> loc_set_date_bs_5:
   739 00008645 E83B000000          <1> 	call	write_backspace
   740 0000864A E95AFEFFFF          <1>         jmp     loc_enter_month_2
   741                              <1> loc_set_date_stc_6:
   742 0000864F E843000000          <1> 	call	check_for_backspace
   743 00008654 740A                <1>         je      short  loc_set_date_bs_6
   744                              <1> 	;xor	bh, bh ; video page 0
   745 00008656 E8869DFFFF          <1> 	call	beeper ; BEEP !
   746 0000865B E9A7FEFFFF          <1>         jmp     loc_enter_year_1
   747                              <1> loc_set_date_bs_6:
   748 00008660 E820000000          <1> 	call	write_backspace
   749 00008665 E97BFEFFFF          <1>         jmp     loc_enter_separator_2
   750                              <1> loc_set_date_stc_7:
   751 0000866A E828000000          <1> 	call	check_for_backspace
   752 0000866F 740A                <1> 	je	short loc_set_date_bs_7
   753                              <1> 	;xor	bh, bh ; video page 0
   754 00008671 E86B9DFFFF          <1> 	call	beeper ; BEEP !
   755 00008676 E9B7FEFFFF          <1>         jmp     loc_enter_year_2
   756                              <1> loc_set_date_bs_7:
   757 0000867B E805000000          <1> 	call	write_backspace
   758 00008680 E982FEFFFF          <1>         jmp     loc_enter_year_1
   759                              <1> 
   760                              <1> write_backspace:
   761                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   762 00008685 B008                <1> 	mov	al, 08h ; BACKSPACE
   763                              <1> 	; 13/05/2016
   764 00008687 66BB0700            <1> 	mov	bx, 7 ; bl = attribute/color
   765                              <1> 		      ; bh = video page = 0	
   766 0000868B E86D9CFFFF          <1> 	call	_write_tty
   767 00008690 B020                <1> 	mov	al, 20h ; BLANK/SPACE char 
   768                              <1> 	;mov	bx, 7 ; attribute/color
   769                              <1> 	;call	_write_c_current
   770                              <1> 	;retn
   771 00008692 E9DF9BFFFF          <1> 	jmp	_write_c_current
   772                              <1> 
   773                              <1> check_for_backspace:
   774                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   775 00008697 663D080E            <1> 	cmp	ax, 0E08h
   776 0000869B 7410                <1> 	je	short cfbs_retn
   777 0000869D 663DE04B            <1> 	cmp	ax, 4BE0h
   778 000086A1 740A                <1> 	je	short cfbs_retn
   779 000086A3 663D004B            <1> 	cmp	ax, 4B00h
   780 000086A7 7404                <1> 	je	short cfbs_retn
   781 000086A9 663DE053            <1> 	cmp	ax, 53E0h
   782                              <1> cfbs_retn:
   783 000086AD C3                  <1> 	retn
   784                              <1> 
   785                              <1> show_time:
   786                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   787                              <1>         ; 2004-2005
   788                              <1> 
   789                              <1> 	;mov	ah, 02h
   790                              <1> 	;call	int1Ah
   791 000086AE E8EDE3FFFF          <1> 	call	RTC_20	; GET RTC TIME
   792                              <1> 	
   793 000086B3 88E8                <1> 	mov	al, ch
   794 000086B5 E81E88FFFF          <1> 	call	bcd_to_ascii
   795 000086BA 66A3[90390100]      <1> 	mov	[Hour], ax
   796                              <1> 
   797 000086C0 88C8                <1> 	mov	al, cl
   798 000086C2 E81188FFFF          <1> 	call	bcd_to_ascii
   799 000086C7 66A3[93390100]      <1> 	mov	[Minute], ax
   800                              <1> 
   801 000086CD 88F0                <1> 	mov	al, dh
   802 000086CF E80488FFFF          <1> 	call	bcd_to_ascii
   803 000086D4 66A3[96390100]      <1> 	mov	[Second], ax
   804                              <1> 
   805 000086DA BE[80390100]        <1> 	mov	esi, Msg_Show_Time
   806 000086DF E861EEFFFF          <1> 	call	print_msg
   807 000086E4 C3                  <1> 	retn
   808                              <1> 
   809                              <1> set_time:
   810                              <1> 	; 13/05/2016
   811                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   812                              <1>         ; 2004-2005
   813                              <1> 
   814 000086E5 BE[6F390100]        <1> 	mov 	esi, Msg_Enter_Time
   815 000086EA E856EEFFFF          <1> 	call	print_msg
   816                              <1> 
   817                              <1> loc_enter_hour_1:
   818 000086EF 30E4                <1> 	xor     ah, ah
   819 000086F1 E8EF87FFFF          <1> 	call	int16h
   820                              <1> 	; AL = ASCII Code of the Character
   821 000086F6 3C0D                <1> 	cmp	al, 13 ; ENTER key
   822 000086F8 0F84AE010000        <1>         je      loc_set_time_retn
   823 000086FE 3C1B                <1> 	cmp	al, 27 ; ESC key
   824 00008700 0F84A6010000        <1>         je      loc_set_time_retn
   825 00008706 A2[90390100]        <1> 	mov	[Hour], al
   826 0000870B 3C30                <1> 	cmp	al, '0'
   827 0000870D 0F82A4010000        <1>         jb      loc_set_time_stc_0
   828 00008713 3C32                <1> 	cmp	al, '2'
   829 00008715 0F879C010000        <1>         ja      loc_set_time_stc_0
   830                              <1> 	; 13/05/2016
   831                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   832                              <1> 		      ; video page 0 (bh)
   833 0000871B B307                <1> 	mov	bl, 7	
   834 0000871D E8DB9BFFFF          <1> 	call	_write_tty
   835                              <1> loc_enter_hour_2:
   836 00008722 30E4                <1> 	xor     ah, ah
   837 00008724 E8BC87FFFF          <1> 	call	int16h
   838                              <1> 	; AL = ASCII Code of the Character
   839 00008729 3C1B                <1> 	cmp	al, 27
   840 0000872B 0F847B010000        <1>         je      loc_set_time_retn
   841 00008731 A2[91390100]        <1> 	mov	[Hour+1], al
   842 00008736 3C30                <1> 	cmp	al, '0'
   843 00008738 0F8283010000        <1>         jb      loc_set_time_stc_1
   844 0000873E 3C39                <1> 	cmp	al, '9'
   845 00008740 0F877B010000        <1> 	ja	loc_set_time_stc_1
   846 00008746 803D[90390100]32    <1>         cmp     byte [Hour], '2'
   847 0000874D 7208                <1> 	jb	short pass_set_time_24
   848 0000874F 3C34                <1> 	cmp	al, '4'
   849 00008751 0F876A010000        <1>         ja      loc_set_time_stc_1
   850                              <1> pass_set_time_24:
   851                              <1> 	; 13/05/2016
   852                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   853                              <1> 		      ; video page 0 (bh)
   854 00008757 B307                <1> 	mov	bl, 7	
   855 00008759 E89F9BFFFF          <1> 	call	_write_tty
   856                              <1> loc_enter_time_separator_1:
   857 0000875E 28E4                <1> 	sub    ah, ah ; 0
   858 00008760 E88087FFFF          <1> 	call	int16h
   859                              <1> 	; AL = ASCII Code of the Character
   860 00008765 3C1B                <1> 	cmp	al, 27
   861 00008767 0F843F010000        <1>         je      loc_set_time_retn
   862 0000876D 3C3A                <1> 	cmp	al, ':'
   863 0000876F 0F8567010000        <1>         jne     loc_set_time_stc_2
   864                              <1> 	; 13/05/2016
   865                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   866                              <1> 		      ; video page 0 (bh)
   867 00008775 B307                <1> 	mov	bl, 7	
   868 00008777 E8819BFFFF          <1> 	call	_write_tty
   869                              <1> loc_enter_minute_1:
   870 0000877C 30E4                <1> 	xor     ah, ah
   871 0000877E E86287FFFF          <1> 	call	int16h
   872                              <1> 	; AL = ASCII Code of the Character
   873 00008783 3C1B                <1> 	cmp	al, 27
   874 00008785 0F8421010000        <1>         je      loc_set_time_retn
   875 0000878B A2[93390100]        <1> 	mov	[Minute], al
   876 00008790 3C30                <1> 	cmp	al, '0'
   877 00008792 0F825F010000        <1>         jb      loc_set_time_stc_3
   878 00008798 3C35                <1> 	cmp	al, '5'
   879 0000879A 0F8757010000        <1>         ja      loc_set_time_stc_3
   880                              <1> 	; 13/05/2016
   881                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   882                              <1> 		      ; video page 0 (bh)
   883 000087A0 B307                <1> 	mov	bl, 7	
   884 000087A2 E8569BFFFF          <1> 	call	_write_tty
   885                              <1> loc_enter_minute_2:
   886 000087A7 30E4                <1> 	xor     ah, ah
   887 000087A9 E83787FFFF          <1> 	call	int16h
   888                              <1> 	; AL = ASCII Code of the Character
   889 000087AE 3C1B                <1> 	cmp	al, 27
   890 000087B0 0F84F6000000        <1>         je      loc_set_time_retn
   891 000087B6 A2[94390100]        <1> 	mov	[Minute+1], al
   892 000087BB 3C30                <1> 	cmp	al, '0'
   893 000087BD 0F824F010000        <1>         jb      loc_set_time_stc_4
   894 000087C3 3C39                <1> 	cmp	al, '9'
   895 000087C5 0F8747010000        <1>         ja      loc_set_time_stc_4
   896                              <1> 	; 13/05/2016
   897                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   898                              <1> 		      ; video page 0 (bh)
   899 000087CB B307                <1> 	mov	bl, 7	
   900 000087CD E82B9BFFFF          <1> 	call	_write_tty
   901                              <1> loc_enter_time_separator_2:
   902 000087D2 66C705[96390100]30- <1> 	mov	word [Second], 3030h
   902 000087DA 30                  <1>
   903 000087DB 28E4                <1> 	sub     ah, ah
   904 000087DD E80387FFFF          <1> 	call	int16h
   905                              <1> 	; AL = ASCII Code of the Character
   906 000087E2 3C0D                <1> 	cmp	al, 13
   907 000087E4 0F8485000000        <1>         je      loc_set_time_progress
   908 000087EA 3C1B                <1> 	cmp	al, 27
   909 000087EC 0F84BA000000        <1>         je      loc_set_time_retn
   910 000087F2 3C3A                <1> 	cmp	al, ':'
   911 000087F4 0F8533010000        <1>         jne     loc_set_time_stc_5
   912                              <1> 	; 13/05/2016
   913                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   914                              <1> 		      ; video page 0 (bh)
   915 000087FA B307                <1> 	mov	bl, 7	
   916 000087FC E8FC9AFFFF          <1> 	call	_write_tty
   917                              <1> loc_enter_second_1:
   918 00008801 30E4                <1> 	xor     ah, ah
   919 00008803 E8DD86FFFF          <1> 	call	int16h
   920                              <1> 	; AL = ASCII Code of the Character
   921 00008808 3C0D                <1> 	cmp	al, 13
   922 0000880A 7463                <1> 	je	short loc_set_time_progress
   923 0000880C 3C1B                <1> 	cmp	al, 27
   924 0000880E 0F8498000000        <1>         je      loc_set_time_retn
   925 00008814 A2[96390100]        <1> 	mov	[Second], al
   926 00008819 3C30                <1> 	cmp	al, '0'
   927 0000881B 0F8227010000        <1>         jb      loc_set_time_stc_6
   928 00008821 3C35                <1> 	cmp	al, '5'
   929 00008823 0F871F010000        <1>         ja      loc_set_time_stc_6
   930                              <1> 	; 13/05/2016
   931                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   932                              <1> 		      ; video page 0 (bh)
   933 00008829 B307                <1> 	mov	bl, 7	
   934 0000882B E8CD9AFFFF          <1> 	call	_write_tty
   935                              <1> loc_enter_second_2:
   936 00008830 30E4                <1> 	xor     ah, ah
   937 00008832 E8AE86FFFF          <1> 	call	int16h
   938                              <1> 	; AL = ASCII Code of the Character
   939 00008837 3C1B                <1> 	cmp	al, 27
   940 00008839 7471                <1> 	je	short loc_set_time_retn
   941 0000883B 3C30                <1> 	cmp	al, '0'
   942 0000883D 0F8229010000        <1>         jb      loc_set_time_stc_7
   943 00008843 3C39                <1> 	cmp	al, '9'
   944 00008845 0F8721010000        <1>         ja      loc_set_time_stc_7
   945                              <1> 	; 13/05/2016
   946                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   947                              <1> 		      ; video page 0 (bh)
   948 0000884B B307                <1> 	mov	bl, 7	
   949 0000884D E8AB9AFFFF          <1> 	call	_write_tty
   950                              <1> loc_set_time_get_lchar_again:
   951 00008852 28E4                <1> 	sub	ah, ah ; 0
   952 00008854 E88C86FFFF          <1> 	call	int16h
   953                              <1> 	; AL = ASCII Code of the Character
   954 00008859 3C0D                <1> 	cmp	al, 13
   955 0000885B 7412                <1> 	je	short loc_set_time_progress
   956 0000885D 3C1B                <1> 	cmp	al, 27
   957 0000885F 744B                <1> 	je	short loc_set_time_retn
   958                              <1> 	;
   959 00008861 E831FEFFFF          <1> 	call	check_for_backspace
   960 00008866 75EA                <1> 	jne	short loc_set_time_get_lchar_again
   961                              <1> 
   962                              <1> loc_set_time_bs_8:
   963 00008868 E818FEFFFF          <1> 	call	write_backspace
   964 0000886D EBC1                <1> 	jmp	short loc_enter_second_2
   965                              <1> 
   966                              <1> loc_set_time_progress:
   967                              <1> 	; Get Current Time
   968                              <1> 	;mov 	ah, 02h
   969                              <1> 	;call	int1Ah
   970 0000886F E82CE2FFFF          <1> 	call	RTC_20	; GET RTC TIME
   971                              <1> 	;DL = Daylight Savings Enable option (0-1)	
   972                              <1> 
   973 00008874 66A1[90390100]      <1> 	mov	ax, [Hour]
   974 0000887A 662D3030            <1> 	sub	ax, '00'
   975 0000887E C0E004              <1> 	shl	al, 4 ; * 16
   976 00008881 88C5                <1> 	mov	ch, al
   977 00008883 00E5                <1> 	add	ch, ah
   978 00008885 66A1[93390100]      <1> 	mov	ax, [Minute]
   979 0000888B 662D3030            <1> 	sub	ax, '00'
   980 0000888F C0E004              <1> 	shl	al, 4 ; * 16
   981 00008892 88C1                <1> 	mov	cl, al
   982 00008894 00E1                <1> 	add	cl, ah
   983 00008896 66A1[96390100]      <1> 	mov	ax, [Second]
   984 0000889C 662D3030            <1> 	sub	ax, '00'
   985 000088A0 C0E004              <1> 	shl	al, 4 ; * 16
   986 000088A3 88C6                <1> 	mov	dh, al
   987 000088A5 00E6                <1> 	add	dh, ah
   988                              <1> 	
   989                              <1> 	;mov	ah, 03h
   990                              <1> 	;call	int1Ah
   991 000088A7 E823E2FFFF          <1> 	call	RTC_30	; SET RTC TIME
   992                              <1> 
   993                              <1> loc_set_time_retn:
   994 000088AC BE[BF440100]        <1> 	mov 	esi, nextline
   995 000088B1 E88FECFFFF          <1> 	call	print_msg
   996 000088B6 C3                  <1> 	retn
   997                              <1> 
   998                              <1> loc_set_time_stc_0:
   999                              <1> 	;xor	bh, bh ; video page 0
  1000 000088B7 E8259BFFFF          <1> 	call	beeper ; BEEP !
  1001 000088BC E92EFEFFFF          <1>         jmp     loc_enter_hour_1
  1002                              <1> loc_set_time_stc_1:
  1003 000088C1 E8D1FDFFFF          <1> 	call	check_for_backspace
  1004 000088C6 740A                <1> 	je	short loc_set_time_bs_1
  1005                              <1> 	;xor	bh, bh ; video page 0
  1006 000088C8 E8149BFFFF          <1> 	call	beeper ; BEEP !
  1007 000088CD E950FEFFFF          <1>         jmp     loc_enter_hour_2
  1008                              <1> loc_set_time_bs_1:
  1009 000088D2 E8AEFDFFFF          <1> 	call	write_backspace
  1010 000088D7 E913FEFFFF          <1>         jmp     loc_enter_hour_1
  1011                              <1> loc_set_time_stc_2:
  1012 000088DC E8B6FDFFFF          <1> 	call	check_for_backspace
  1013 000088E1 740A                <1> 	je	short loc_set_time_bs_2
  1014                              <1> 	;xor	bh, bh ; video page 0
  1015 000088E3 E8F99AFFFF          <1> 	call	beeper ; BEEP !
  1016 000088E8 E971FEFFFF          <1>         jmp     loc_enter_time_separator_1
  1017                              <1> loc_set_time_bs_2:
  1018 000088ED E893FDFFFF          <1> 	call	write_backspace
  1019 000088F2 E92BFEFFFF          <1>         jmp     loc_enter_hour_2
  1020                              <1> loc_set_time_stc_3:
  1021 000088F7 E89BFDFFFF          <1> 	call	check_for_backspace
  1022 000088FC 740A                <1> 	je	short loc_set_time_bs_3
  1023                              <1> 	;xor	bh, bh ; video page 0
  1024 000088FE E8DE9AFFFF          <1> 	call	beeper ; BEEP !6
  1025 00008903 E974FEFFFF          <1>         jmp     loc_enter_minute_1
  1026                              <1> loc_set_time_bs_3:
  1027 00008908 E878FDFFFF          <1> 	call	write_backspace
  1028 0000890D E94CFEFFFF          <1>         jmp     loc_enter_time_separator_1
  1029                              <1> loc_set_time_stc_4:
  1030 00008912 E880FDFFFF          <1> 	call	check_for_backspace
  1031 00008917 740A                <1> 	je	short loc_set_time_bs_4
  1032                              <1> 	;xor	bh, bh ; video page 0
  1033 00008919 E8C39AFFFF          <1> 	call	beeper ; BEEP !
  1034 0000891E E984FEFFFF          <1>         jmp     loc_enter_minute_2
  1035                              <1> loc_set_time_bs_4:
  1036 00008923 E85DFDFFFF          <1> 	call	write_backspace
  1037 00008928 E94FFEFFFF          <1>         jmp     loc_enter_minute_1
  1038                              <1> loc_set_time_stc_5:
  1039 0000892D E865FDFFFF          <1> 	call	check_for_backspace
  1040 00008932 740A                <1> 	je	short loc_set_time_bs_5
  1041                              <1> 	;xor	bh, bh ; video page 0
  1042 00008934 E8A89AFFFF          <1> 	call	beeper ; BEEP !
  1043 00008939 E994FEFFFF          <1>         jmp     loc_enter_time_separator_2
  1044                              <1> loc_set_time_bs_5:
  1045 0000893E E842FDFFFF          <1> 	call	write_backspace
  1046 00008943 E95FFEFFFF          <1>         jmp     loc_enter_minute_2
  1047                              <1> loc_set_time_stc_6:
  1048 00008948 E84AFDFFFF          <1> 	call	check_for_backspace
  1049 0000894D 7413                <1> 	je	short loc_set_time_bs_6
  1050                              <1> 	;xor	bh, bh ; video page 0
  1051 0000894F E88D9AFFFF          <1> 	call	beeper ; BEEP !
  1052 00008954 66C705[96390100]30- <1> 	mov	word [Second], 3030h
  1052 0000895C 30                  <1>
  1053 0000895D E99FFEFFFF          <1>         jmp     loc_enter_second_1
  1054                              <1> loc_set_time_bs_6:
  1055 00008962 E81EFDFFFF          <1> 	call	write_backspace
  1056 00008967 E966FEFFFF          <1>         jmp     loc_enter_time_separator_2
  1057                              <1> loc_set_time_stc_7:
  1058 0000896C E826FDFFFF          <1> 	call	check_for_backspace
  1059 00008971 740A                <1> 	je	short loc_set_time_bs_7
  1060                              <1> 	;xor	bh, bh ; video page 0
  1061 00008973 E8699AFFFF          <1> 	call	beeper ; BEEP !
  1062 00008978 E9B3FEFFFF          <1>         jmp     loc_enter_second_2
  1063                              <1> loc_set_time_bs_7:
  1064 0000897D E803FDFFFF          <1> 	call	write_backspace
  1065 00008982 E97AFEFFFF          <1>         jmp     loc_enter_second_1
  1066                              <1> 
  1067                              <1> print_volume_info:
  1068                              <1> 	; 01/03/2016
  1069                              <1> 	; 08/02/2016
  1070                              <1> 	; 06/02/2016
  1071                              <1> 	; 04/02/2016
  1072                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
  1073                              <1> 	; 25/10/2009
  1074                              <1> 	;
  1075                              <1> 	; "Volume Serial No: "
  1076                              <1>  	;
  1077                              <1> 	; INPUT  : AL = DOS Drive Number
  1078                              <1> 	; OUTPUT : AH = FS Type
  1079                              <1> 	;          AL = DOS Drive Name
  1080                              <1> 	; CF = 0 -> OK
  1081                              <1> 	; CF = 1 -> Drive not ready 
  1082                              <1> 
  1083 00008987 88C4                <1> 	mov	ah, al
  1084 00008989 28C0                <1> 	sub	al, al
  1085 0000898B 0FB7F0              <1> 	movzx	esi, ax	
  1086 0000898E 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1087 00008994 8A06                <1> 	mov	al, [esi]
  1088 00008996 3C41                <1> 	cmp	al, 'A'  
  1089 00008998 7304                <1> 	jnb	short loc_pvi_set_vol_name
  1090 0000899A 8A6604              <1> 	mov	ah, [esi+LD_FSType]
  1091 0000899D C3                  <1> 	retn
  1092                              <1> 
  1093                              <1> loc_pvi_set_vol_name:
  1094 0000899E A2[CA390100]        <1> 	mov	[Vol_Drv_Name], al
  1095 000089A3 56                  <1> 	push	esi
  1096 000089A4 E858010000          <1> 	call	move_volume_name_and_serial_no ;;;
  1097 000089A9 7302                <1> 	jnc	short loc_pvi_mvn_ok
  1098 000089AB 5E                  <1> 	pop	esi
  1099 000089AC C3                  <1> 	retn
  1100                              <1> 
  1101                              <1> loc_pvi_mvn_ok:
  1102 000089AD 8B3424              <1> 	mov	esi, [esp]
  1103 000089B0 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  1104 000089B4 7509                <1> 	jne	short loc_pvi_fat_vol_size
  1105 000089B6 8B4670              <1> 	mov	eax, [esi+LD_FS_VolumeSize]
  1106 000089B9 0FB75E11            <1> 	movzx	ebx, word [esi+LD_FS_BytesPerSec]
  1107 000089BD EB07                <1> 	jmp	short loc_vol_size_mul32
  1108                              <1> loc_pvi_fat_vol_size:
  1109 000089BF 8B4670              <1> 	mov	eax, [esi+LD_TotalSectors]
  1110 000089C2 0FB75E11            <1> 	movzx	ebx, word [esi+LD_BPB+BPB_BytsPerSec]
  1111                              <1> loc_vol_size_mul32:
  1112 000089C6 F7E3                <1> 	mul	ebx
  1113 000089C8 09D2                <1> 	or	edx, edx
  1114 000089CA 7507                <1> 	jnz	short loc_vol_size_in_kbytes
  1115                              <1> loc_vol_size_in_bytes:
  1116 000089CC B9[A8390100]        <1> 	mov	ecx, VolSize_Bytes
  1117 000089D1 EB0D                <1> 	jmp	short loc_write_vol_size_str
  1118                              <1> loc_vol_size_in_kbytes:
  1119 000089D3 66BB0004            <1> 	mov	bx, 1024
  1120 000089D7 F7F3                <1> 	div	ebx
  1121 000089D9 B9[9B390100]        <1> 	mov 	ecx, VolSize_KiloBytes
  1122 000089DE 31D2                <1> 	xor	edx, edx ; 0
  1123                              <1> loc_write_vol_size_str:
  1124 000089E0 890D[8B890100]      <1> 	mov	[VolSize_Unit1], ecx
  1125                              <1> 	; 
  1126 000089E6 BF[A1890100]        <1> 	mov	edi, Vol_Tot_Sec_Str_End
  1127                              <1>         ;mov	byte [edi], 0
  1128 000089EB B90A000000          <1> 	mov	ecx, 10
  1129                              <1> loc_write_vol_size_chr:
  1130 000089F0 F7F1                <1> 	div	ecx
  1131 000089F2 80C230              <1> 	add	dl, '0'
  1132 000089F5 4F                  <1> 	dec	edi	
  1133 000089F6 8817                <1> 	mov	[edi], dl
  1134 000089F8 85C0                <1> 	test	eax, eax
  1135 000089FA 7404                <1> 	jz	short loc_write_vol_size_str_ok
  1136 000089FC 28D2                <1> 	sub	dl, dl ; 0
  1137 000089FE EBF0                <1> 	jmp	short loc_write_vol_size_chr
  1138                              <1> 
  1139                              <1> loc_write_vol_size_str_ok:
  1140 00008A00 893D[93890100]      <1> 	mov	[Vol_Tot_Sec_Str_Start], edi
  1141                              <1> 	;
  1142 00008A06 BF[B3390100]        <1> 	mov	edi, Vol_FS_Name
  1143 00008A0B 8A4E03              <1> 	mov	cl, [esi+LD_FATType]
  1144 00008A0E 20C9                <1> 	and	cl, cl ; 0 ?
  1145 00008A10 7515                <1> 	jnz	short loc_write_vol_FAT_str_1
  1146 00008A12 66C7075452          <1> 	mov	word [edi], 'TR'
  1147 00008A17 C7470420465331      <1> 	mov	dword [edi+4], ' FS1'
  1148                              <1> 	;movzx	ebx, word [esi+LD_FS_BytesPerSec]
  1149 00008A1E 668B5E11            <1> 	mov	bx, [esi+LD_FS_BytesPerSec]
  1150 00008A22 8B4674              <1> 	mov	eax, [esi+LD_FS_FreeSectors]
  1151 00008A25 EB36                <1> 	jmp	short loc_vol_freespace_mul32
  1152                              <1> 
  1153                              <1> loc_write_vol_FAT_str_1:
  1154 00008A27 66B83332            <1> 	mov	ax, '32' ; FAT32
  1155 00008A2B 80F902              <1> 	cmp	cl, 2 ; [esi+LD_FATType]
  1156 00008A2E 7708                <1> 	ja	short loc_write_vol_FAT_str_2
  1157 00008A30 66B83132            <1> 	mov	ax, '12' ; FAT12
  1158 00008A34 7202                <1> 	jb	short loc_write_vol_FAT_str_2
  1159 00008A36 B436                <1> 	mov	ah, '6'  ; FAT16
  1160                              <1> loc_write_vol_FAT_str_2:
  1161 00008A38 C70746415420        <1> 	mov	dword [edi], 'FAT '
  1162 00008A3E 66894704            <1> 	mov	word [edi+4], ax
  1163                              <1> 	;
  1164                              <1> 	;movzx	ebx, word [esi+LD_BPB+BPB_BytsPerSec]
  1165 00008A42 668B5E11            <1> 	mov	bx, [esi+LD_BPB+BPB_BytsPerSec]
  1166 00008A46 8B4674              <1> 	mov	eax, [esi+LD_FreeSectors]
  1167                              <1> 
  1168                              <1> loc_vol_freespace_recalc0:
  1169                              <1> 	; 01/03/2016
  1170 00008A49 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh
  1171 00008A4C 720F                <1> 	jb	short loc_vol_freespace_mul32
  1172                              <1> 	;inc	eax ; 0
  1173 00008A4E 20C9                <1> 	and	cl, cl ; byte [esi+LD_FATType]
  1174 00008A50 740B                <1> 	jz	short loc_vol_freespace_mul32 	
  1175 00008A52 53                  <1> 	push	ebx
  1176 00008A53 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free sectors
  1177 00008A57 E876490000          <1> 	call	calculate_fat_freespace
  1178 00008A5C 5B                  <1> 	pop	ebx
  1179                              <1> 
  1180                              <1> loc_vol_freespace_mul32:
  1181 00008A5D F7E3                <1> 	mul	ebx
  1182 00008A5F 09D2                <1> 	or	edx, edx
  1183 00008A61 7507                <1> 	jnz	short loc_vol_fspace_in_kbytes
  1184                              <1> loc_vol_fspace_in_bytes:
  1185 00008A63 B9[A8390100]        <1> 	mov	ecx, VolSize_Bytes
  1186 00008A68 EB0D                <1> 	jmp	short loc_write_vol_fspace_str
  1187                              <1> loc_vol_fspace_in_kbytes:
  1188 00008A6A 66BB0004            <1> 	mov	bx, 1024
  1189 00008A6E F7F3                <1> 	div	ebx
  1190 00008A70 B9[9B390100]        <1> 	mov 	ecx, VolSize_KiloBytes
  1191 00008A75 31D2                <1> 	xor	edx, edx ; 0
  1192                              <1> loc_write_vol_fspace_str:
  1193 00008A77 890D[8F890100]      <1> 	mov	[VolSize_Unit2], ecx
  1194                              <1> 	;	
  1195 00008A7D BF[B1890100]        <1> 	mov	edi, Vol_Free_Sectors_Str_End
  1196                              <1>         ;mov	byte [edi], 0
  1197 00008A82 B90A000000          <1> 	mov	ecx, 10
  1198                              <1> loc_write_vol_fspace_chr:
  1199 00008A87 F7F1                <1> 	div	ecx
  1200 00008A89 80C230              <1> 	add	dl, '0'
  1201 00008A8C 4F                  <1> 	dec	edi	
  1202 00008A8D 8817                <1> 	mov	[edi], dl
  1203 00008A8F 85C0                <1> 	test	eax, eax
  1204 00008A91 7404                <1> 	jz	short loc_write_vol_fspace_str_ok
  1205 00008A93 28D2                <1> 	sub	dl, dl ; 0
  1206 00008A95 EBF0                <1> 	jmp	short loc_write_vol_fspace_chr
  1207                              <1> 
  1208                              <1> loc_write_vol_fspace_str_ok:
  1209 00008A97 893D[A3890100]      <1> 	mov	[Vol_Free_Sectors_Str_Start], edi
  1210                              <1> 	;
  1211 00008A9D BE[B1390100]        <1> 	mov	esi, Volume_in_drive
  1212 00008AA2 E89EEAFFFF          <1> 	call	print_msg
  1213 00008AA7 BE[F1390100]        <1> 	mov	esi, Vol_Name
  1214 00008AAC E894EAFFFF          <1> 	call	print_msg
  1215 00008AB1 BE[BF440100]        <1> 	mov	esi, nextline
  1216 00008AB6 E88AEAFFFF          <1> 	call	print_msg
  1217                              <1> 	;
  1218 00008ABB BE[523A0100]        <1> 	mov	esi, Vol_Total_Sector_Header
  1219 00008AC0 E880EAFFFF          <1> 	call	print_msg
  1220 00008AC5 8B35[93890100]      <1> 	mov	esi, [Vol_Tot_Sec_Str_Start]
  1221 00008ACB E875EAFFFF          <1> 	call	print_msg
  1222 00008AD0 8B35[8B890100]      <1> 	mov	esi, [VolSize_Unit1]
  1223 00008AD6 E86AEAFFFF          <1> 	call	print_msg
  1224                              <1> 	;
  1225 00008ADB BE[633A0100]        <1> 	mov	esi, Vol_Free_Sectors_Header
  1226 00008AE0 E860EAFFFF          <1> 	call	print_msg
  1227 00008AE5 8B35[A3890100]      <1> 	mov	esi, [Vol_Free_Sectors_Str_Start]
  1228 00008AEB E855EAFFFF          <1> 	call	print_msg
  1229 00008AF0 8B35[8F890100]      <1> 	mov	esi, [VolSize_Unit2]
  1230 00008AF6 E84AEAFFFF          <1> 	call	print_msg
  1231                              <1> 	;
  1232 00008AFB 5E                  <1> 	pop	esi
  1233                              <1> 	
  1234                              <1> 	;mov	ah, [esi+LD_FSType]
  1235                              <1> 	;mov	al, [esi+LD_FATType]
  1236 00008AFC 668B4603            <1> 	mov	ax, [esi+LD_FATType]
  1237                              <1> 
  1238 00008B00 C3                  <1> 	retn
  1239                              <1> 
  1240                              <1> move_volume_name_and_serial_no:
  1241                              <1> 	; 08/02/2016  (TRDOS 386 = TRDOS v2.0)
  1242                              <1> 	; this routine will be called by
  1243                              <1> 	; "print_volume_info" and "print_directory"
  1244                              <1> 	; INPUT ->
  1245                              <1> 	;	ESI = Logical DOS drv descripton table address
  1246                              <1> 	; OUTPUT ->
  1247                              <1> 	;	*Volume name will be moved to text area
  1248                              <1> 	;	*Volume serial number will be converted to
  1249                              <1> 	;	 text and will be moved to text area
  1250                              <1> 	;   cf = 1 -> invalid/unknown dos drive
  1251                              <1> 	;   cf = 0 -> ecx = 0
  1252                              <1> 	;
  1253                              <1> 	; (eax, edx, ecx, esi, edi will be changed)
  1254                              <1> 
  1255 00008B01 BF[F1390100]        <1> 	mov 	edi, Vol_Name
  1256                              <1> 
  1257                              <1> 	;mov	ah, [esi+LD_FSType]
  1258                              <1> 	;mov	al, [esi+LD_FATType]
  1259 00008B06 668B4603            <1> 	mov	ax, [esi+LD_FATType]
  1260 00008B0A 80FCA1              <1> 	cmp	ah, 0A1h
  1261 00008B0D 7418                <1> 	je	short mvn_2
  1262 00008B0F 08E4                <1> 	or	ah, ah
  1263 00008B11 7404                <1> 	jz	short mvn_0
  1264 00008B13 08C0                <1> 	or	al, al
  1265 00008B15 7504                <1> 	jnz	short mvn_1
  1266                              <1> mvn_0:
  1267 00008B17 8A06                <1> 	mov	al, [esi]
  1268 00008B19 F9                  <1> 	stc
  1269 00008B1A C3                  <1> 	retn
  1270                              <1> mvn_1:
  1271 00008B1B 3C02                <1> 	cmp	al, 2
  1272 00008B1D 7717                <1> 	ja	short mvn_3 
  1273                              <1> 	;or	al, al
  1274                              <1> 	;jz	short mvn_2
  1275 00008B1F 8B462D              <1> 	mov	eax, [esi+LD_BPB+VolumeID]
  1276 00008B22 83C631              <1> 	add	esi, LD_BPB+VolumeLabel
  1277 00008B25 EB15                <1> 	jmp	short mvn_4
  1278                              <1> mvn_2:
  1279 00008B27 8B4628              <1> 	mov	eax, [esi+LD_FS_VolumeSerial]
  1280 00008B2A 83C62C              <1> 	add	esi, LD_FS_VolumeName
  1281 00008B2D B910000000          <1> 	mov	ecx, 16
  1282 00008B32 F3A5                <1> 	rep	movsd
  1283 00008B34 EB10                <1> 	jmp	short mvn_5
  1284                              <1> mvn_3:
  1285 00008B36 8B4649              <1> 	mov	eax, [esi+LD_BPB+FAT32_VolID]
  1286 00008B39 83C64D              <1> 	add	esi, LD_BPB+FAT32_VolLab
  1287                              <1> mvn_4:
  1288 00008B3C B90B000000          <1> 	mov	ecx, 11
  1289 00008B41 F3A4                <1> 	rep	movsb
  1290 00008B43 C60700              <1> 	mov	byte [edi], 0
  1291                              <1> mvn_5:
  1292                              <1> 	;mov	[Current_VolSerial], eax  
  1293 00008B46 E8B8B7FFFF          <1> 	call	dwordtohex
  1294 00008B4B 8915[463A0100]      <1> 	mov	[Vol_Serial1], edx
  1295 00008B51 A3[4B3A0100]        <1> 	mov	[Vol_Serial2], eax
  1296                              <1> 	; ecx = 0
  1297 00008B56 C3                  <1> 	retn
  1298                              <1> 
  1299                              <1> get_volume_serial_number:
  1300                              <1> 	; 19/01/2016 (TRDOS 386 = TRDOS v2.0)
  1301                              <1> 	; 08/08/2010
  1302                              <1> 	;
  1303                              <1> 	; INPUT -> DL = Logical DOS Drive number
  1304                              <1> 	; OUTPUT -> EAX = Volume serial number
  1305                              <1> 	;          BL= FAT Type	    
  1306                              <1> 	;          BH = Logical DOS drv Number (DL input)
  1307                              <1> 	; cf = 1 -> Drive not ready
  1308                              <1> 
  1309 00008B57 31DB                <1> 	xor	ebx, ebx
  1310 00008B59 88D7                <1> 	mov	bh, dl
  1311 00008B5B 3815[22380100]      <1> 	cmp	[Last_DOS_DiskNo], dl
  1312 00008B61 7304                <1> 	jnb	short loc_gvsn_start
  1313                              <1> loc_gvsn_stc_retn:
  1314 00008B63 31C0                <1> 	xor	eax, eax
  1315 00008B65 F9                  <1> 	stc 
  1316 00008B66 C3                  <1>         retn 
  1317                              <1> loc_gvsn_start:
  1318 00008B67 56                  <1> 	push	esi
  1319 00008B68 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1320 00008B6D 01DE                <1> 	add	esi, ebx
  1321 00008B6F 8A5E03              <1> 	mov	bl, [esi+LD_FATType]
  1322 00008B72 20DB                <1> 	and	bl, bl
  1323 00008B74 740F                <1> 	jz	short loc_gvsn_fs
  1324 00008B76 80FB02              <1> 	cmp	bl, 2
  1325 00008B79 7705                <1> 	ja	short loc_gvsn_fat32
  1326                              <1> loc_gvsn_fat:
  1327 00008B7B 83C62D              <1> 	add	esi, LD_BPB + VolumeID
  1328 00008B7E EB0E                <1> 	jmp	short loc_gvsn_return
  1329                              <1> loc_gvsn_fat32: 
  1330 00008B80 83C649              <1> 	add	esi, LD_BPB + FAT32_VolID
  1331 00008B83 EB09                <1> 	jmp	short loc_gvsn_return 
  1332                              <1> loc_gvsn_fs:
  1333 00008B85 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  1334 00008B89 75D8                <1> 	jne	short loc_gvsn_stc_retn 
  1335 00008B8B 83C628              <1> 	add	esi, LD_FS_VolumeSerial
  1336                              <1> loc_gvsn_return:
  1337 00008B8E 8B06                <1> 	mov	eax, [esi]
  1338 00008B90 5E                  <1> 	pop	esi
  1339 00008B91 C3                  <1> 	retn
  1340                              <1> 
  1341                              <1> ; CMD_INTR.ASM [ TRDOS Command Interpreter Procedure ]
  1342                              <1> ; 09/11/2011
  1343                              <1> ; 29/01/2005
  1344                              <1> 
  1345                              <1> command_interpreter:
  1346                              <1> 	; 16/10/2016
  1347                              <1> 	; 12/10/2016
  1348                              <1> 	; 13/05/2016
  1349                              <1> 	; 07/05/2016
  1350                              <1> 	; 04/03/2016
  1351                              <1> 	; 04/02/2016
  1352                              <1> 	; 03/02/2016
  1353                              <1> 	; 30/01/2016
  1354                              <1> 	; 29/01/2016 (TRDOS 386 = TRDOS 2.0)
  1355                              <1> 	; 15/09/2011         
  1356                              <1> 	; 29/01/2005
  1357                              <1>         
  1358                              <1> 	; Input: ecx = command word length (CL)
  1359                              <1> 	;	 CommandBuffer = Command string offset
  1360                              <1>  
  1361 00008B92 C605[448A0100]00    <1> 	mov	byte [Program_Exit],0
  1362 00008B99 80F904              <1> 	cmp	cl, 4
  1363 00008B9C 0F87B5020000        <1>         ja      c_6
  1364 00008BA2 0F8237010000        <1>         jb      c_2
  1365                              <1> c_4:
  1366                              <1> 
  1367                              <1> cmp_cmd_exit:
  1368 00008BA8 BF[90380100]        <1> 	mov	edi, Cmd_Exit
  1369 00008BAD E8C2030000          <1> 	call	cmp_cmd	
  1370 00008BB2 7208                <1> 	jc	short cmp_cmd_date
  1371                              <1> 
  1372 00008BB4 C605[448A0100]01    <1>         mov     byte [Program_Exit], 1
  1373 00008BBB C3                  <1>         retn
  1374                              <1> 
  1375                              <1> cmp_cmd_date:
  1376 00008BBC B104                <1> 	mov	cl, 4
  1377 00008BBE BF[AC380100]        <1> 	mov	edi, Cmd_Date
  1378 00008BC3 E8AC030000          <1> 	call	cmp_cmd	
  1379 00008BC8 720B                <1>         jc	short cmp_cmd_time
  1380                              <1> 	
  1381 00008BCA E8D0F7FFFF          <1> 	call	show_date
  1382 00008BCF E80FF8FFFF          <1> 	call	set_date
  1383 00008BD4 C3                  <1> 	retn
  1384                              <1> 
  1385                              <1> cmp_cmd_time:
  1386 00008BD5 B104                <1> 	mov	cl, 4
  1387 00008BD7 BF[B1380100]        <1> 	mov	edi, Cmd_Time
  1388 00008BDC E893030000          <1>    	call	cmp_cmd	
  1389 00008BE1 720B                <1> 	jc	short cmp_cmd_show
  1390                              <1> 
  1391 00008BE3 E8C6FAFFFF          <1> 	call	show_time
  1392 00008BE8 E8F8FAFFFF          <1> 	call	set_time
  1393 00008BED C3                  <1> 	retn
  1394                              <1> 
  1395                              <1> cmp_cmd_show:
  1396 00008BEE B104                <1> 	mov	cl, 4
  1397 00008BF0 BF[C2380100]        <1> 	mov	edi, Cmd_Show
  1398 00008BF5 E87A030000          <1>    	call	cmp_cmd	
  1399 00008BFA 0F83050A0000        <1>         jnc     show_file
  1400                              <1> 
  1401                              <1> cmp_cmd_echo:
  1402 00008C00 B104                <1> 	mov	cl, 4
  1403 00008C02 BF[FE380100]        <1> 	mov	edi, Cmd_Echo
  1404 00008C07 E868030000          <1>    	call	cmp_cmd	
  1405 00008C0C 7224                <1> 	jc	short cmp_cmd_copy
  1406                              <1> 	
  1407                              <1> 	; 22/11/2017
  1408                              <1> 	; AL = 0
  1409 00008C0E 803E20              <1> 	cmp	byte [esi], 20h
  1410 00008C11 7215                <1> 	jb	short cmd_echo_nextline
  1411                              <1> 	; 14/04/2016
  1412 00008C13 56                  <1> 	push	esi
  1413                              <1> cmd_echo_asciiz:
  1414                              <1> 	;inc	esi
  1415                              <1> 	;mov	al, [esi]
  1416                              <1> 	; 22/11/2017
  1417 00008C14 AC                  <1> 	lodsb
  1418 00008C15 3C20                <1> 	cmp	al, 20h
  1419 00008C17 73FB                <1> 	jnb	short cmd_echo_asciiz
  1420 00008C19 4E                  <1> 	dec	esi
  1421 00008C1A C60600              <1> 	mov	byte [esi], 0
  1422 00008C1D 5E                  <1> 	pop	esi
  1423 00008C1E 89F7                <1> 	mov	edi, esi
  1424 00008C20 E820E9FFFF          <1> 	call	print_msg
  1425 00008C25 C60700              <1> 	mov	byte [edi], 0	
  1426                              <1> cmd_echo_nextline:
  1427 00008C28 BE[2D450100]        <1> 	mov	esi, NextLine
  1428                              <1> 	;call	print_msg   
  1429                              <1> 	;retn
  1430 00008C2D E913E9FFFF          <1> 	jmp	print_msg
  1431                              <1> 
  1432                              <1> cmp_cmd_copy:
  1433 00008C32 B104                <1> 	mov	cl, 4
  1434 00008C34 BF[E5380100]        <1> 	mov	edi, Cmd_Copy
  1435 00008C39 E836030000          <1>    	call	cmp_cmd	
  1436 00008C3E 0F83CC170000        <1> 	jnc	copy_file
  1437                              <1> 
  1438                              <1> cmp_cmd_move:
  1439 00008C44 B104                <1> 	mov	cl, 4
  1440 00008C46 BF[EA380100]        <1> 	mov	edi, Cmd_Move
  1441 00008C4B E824030000          <1>    	call	cmp_cmd	
  1442 00008C50 0F836E160000        <1> 	jnc	move_file
  1443                              <1> 
  1444                              <1> cmp_cmd_path:
  1445 00008C56 B104                <1> 	mov	cl, 4
  1446 00008C58 BF[EF380100]        <1> 	mov	edi, Cmd_Path
  1447 00008C5D E812030000          <1>    	call	cmp_cmd	
  1448 00008C62 0F83F0190000        <1> 	jnc	set_get_path
  1449                              <1> 
  1450                              <1> cmp_cmd_beep:
  1451 00008C68 B104                <1> 	mov	cl, 4
  1452 00008C6A BF[1C390100]        <1> 	mov	edi, Cmd_Beep
  1453 00008C6F E800030000          <1>    	call	cmp_cmd	
  1454 00008C74 720B                <1> 	jc	short cmp_cmd_find
  1455                              <1> 	; 13/05/2016
  1456 00008C76 8A3D[BE810100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
  1457 00008C7C E96097FFFF          <1> 	jmp	beeper
  1458                              <1> 
  1459                              <1> cmp_cmd_find:
  1460 00008C81 B104                <1> 	mov	cl, 4
  1461 00008C83 BF[F9380100]        <1> 	mov	edi, Cmd_Find
  1462 00008C88 E8E7020000          <1>    	call	cmp_cmd	
  1463 00008C8D 0F82C4020000        <1>         jc      cmp_cmd_external
  1464                              <1> 
  1465                              <1> 	;call	find_and_list_files
  1466 00008C93 E9AF220000          <1> 	jmp	find_and_list_files
  1467                              <1> 	;retn
  1468                              <1> 
  1469                              <1> c_1:
  1470 00008C98 AD                  <1> 	lodsd
  1471                              <1> cmp_cmd_help:
  1472 00008C99 3C3F                <1> 	cmp	al, '?'
  1473 00008C9B 751D                <1>         jne     short cmp_cmd_remark
  1474                              <1> 
  1475 00008C9D BE[82380100]        <1> 	mov	esi, Command_List
  1476                              <1> cmd_help_next_w:
  1477 00008CA2 E89EE8FFFF          <1> 	call	print_msg
  1478                              <1> 
  1479 00008CA7 803E20              <1> 	cmp	byte [esi], 20h ; 0
  1480 00008CAA 7232                <1> 	jb	short cmd_help_retn
  1481                              <1> 	
  1482 00008CAC 56                  <1> 	push	esi
  1483 00008CAD BE[BF440100]        <1> 	mov	esi, nextline
  1484 00008CB2 E88EE8FFFF          <1> 	call	print_msg
  1485 00008CB7 5E                  <1> 	pop	esi
  1486 00008CB8 EBE8                <1> 	jmp	short cmd_help_next_w	
  1487                              <1> 
  1488                              <1> cmp_cmd_remark:
  1489 00008CBA 3C2A                <1> 	cmp	al, '*'
  1490 00008CBC 0F8595020000        <1>         jne     cmp_cmd_external
  1491 00008CC2 46                  <1> 	inc	esi
  1492 00008CC3 BF[B8820100]        <1> 	mov	edi, Remark
  1493 00008CC8 8A06                <1> 	mov	al, [esi]
  1494 00008CCA 3C20                <1> 	cmp	al, 20h
  1495 00008CCC 7707                <1> 	ja	short cmd_remark_write
  1496 00008CCE 89FE                <1> 	mov	esi, edi ; Remark
  1497 00008CD0 E970E8FFFF          <1> 	jmp	print_msg
  1498                              <1> 
  1499                              <1> cmd_remark_write:
  1500 00008CD5 AA                  <1> 	stosb
  1501 00008CD6 AC                  <1> 	lodsb
  1502 00008CD7 3C20                <1> 	cmp	al, 20h
  1503 00008CD9 73FA                <1> 	jnb	short cmd_remark_write
  1504 00008CDB C60700              <1> 	mov	byte [edi], 0
  1505                              <1> 
  1506                              <1> cmd_help_retn:
  1507                              <1> cmd_remark_retn:
  1508                              <1> cd_retn:
  1509 00008CDE C3                  <1> 	retn
  1510                              <1> 
  1511                              <1> c_2:
  1512 00008CDF 80F902              <1> 	cmp	cl, 2
  1513 00008CE2 0F87AF000000        <1>         ja      c_3
  1514 00008CE8 BE[06830100]        <1> 	mov	esi, CommandBuffer
  1515 00008CED 72A9                <1> 	jb	short c_1
  1516                              <1> 
  1517                              <1> cmp_cmd_cd:
  1518 00008CEF 66AD                <1> 	lodsw
  1519 00008CF1 663D4344            <1> 	cmp	ax, 'CD'
  1520 00008CF5 7551                <1> 	jne	short cmp_cmd_drive
  1521 00008CF7 46                  <1>         inc	esi
  1522                              <1> cd_0:
  1523 00008CF8 668B06              <1> 	mov	ax, [esi]	
  1524 00008CFB 3C20                <1> 	cmp	al, 20h
  1525 00008CFD 76DF                <1> 	jna	short cd_retn
  1526                              <1> 	; 10/02/2016
  1527 00008CFF 80FC3A              <1> 	cmp	ah, ':'
  1528 00008D02 7504                <1> 	jne	short cd_1
  1529 00008D04 46                  <1> 	inc	esi
  1530 00008D05 46                  <1> 	inc	esi
  1531 00008D06 EB49                <1> 	jmp	short cd_2
  1532                              <1> 
  1533                              <1> cd_1:	; change current directory
  1534                              <1> 	; 29/11/2009
  1535                              <1> 	; AH = CDh	; to separate 'CD' command from others
  1536                              <1> 			; for restoring current directory
  1537                              <1> 			; 0CDh sign is for saving cdir into 
  1538                              <1> 			; DOS drv description table cdir area
  1539                              <1> 	
  1540 00008D08 B4CD                <1> 	mov	ah, 0CDh ; mov byte [CD_COMMAND], 0CDh 
  1541                              <1> 
  1542 00008D0A E81D230000          <1> 	call	change_current_directory
  1543 00008D0F 0F8337220000        <1>         jnc     change_prompt_dir_string
  1544                              <1> 
  1545                              <1> cd_error_messages:
  1546 00008D15 3C03                <1> 	cmp	al, 3
  1547 00008D17 740C                <1> 	je	short cd_path_not_found
  1548                              <1> 	; 16/10/2016 (15h -> 15)
  1549 00008D19 3C0F                <1> 	cmp	al, 15 ; drive not ready error 
  1550 00008D1B 7459                <1> 	je	short cd_drive_not_ready
  1551 00008D1D 3C11                <1> 	cmp	al, 17 ; read error
  1552 00008D1F 7455                <1> 	je	short cd_drive_not_ready	
  1553 00008D21 3C13                <1> 	cmp	al, 19 ; ; Bad directory/path name 
  1554 00008D23 7466                <1> 	je	short cd_command_failed
  1555                              <1> 
  1556                              <1> cd_path_not_found:
  1557 00008D25 50                  <1> 	push	eax ; 29/12/2017
  1558                              <1> 	;push	ax	
  1559 00008D26 BE[253B0100]        <1> 	mov	esi, Msg_Dir_Not_Found
  1560 00008D2B E815E8FFFF          <1> 	call	print_msg
  1561                              <1> 	;pop	ax
  1562 00008D30 58                  <1> 	pop	eax ; 29/12/2017
  1563 00008D31 3A25[54820100]      <1> 	cmp	ah, [Current_Dir_Level]
  1564 00008D37 0F830F220000        <1>         jnb     change_prompt_dir_string
  1565 00008D3D 8825[54820100]      <1> 	mov	[Current_Dir_Level], ah
  1566 00008D43 E904220000          <1>         jmp     change_prompt_dir_string   
  1567                              <1> 
  1568                              <1> cmp_cmd_drive: ; change current drive
  1569                              <1> 	; C:, D:, E: etc.
  1570 00008D48 80FC3A              <1> 	cmp	ah, ':'
  1571 00008D4B 0F8506020000        <1>         jne     cmp_cmd_external
  1572                              <1> 
  1573                              <1> cd_2:	; 'CD C:', 'CD D:' ...
  1574 00008D51 803E20              <1> 	cmp	byte [esi], 20h
  1575 00008D54 0F8707020000        <1>         ja      loc_cmd_failed
  1576                              <1> 
  1577 00008D5A 24DF                <1> 	and	al, 0DFh
  1578 00008D5C 2C41                <1> 	sub	al, 'A'
  1579 00008D5E 0F82FD010000        <1>         jc      loc_cmd_failed
  1580                              <1> 
  1581 00008D64 3A05[22380100]      <1>         cmp     al, [Last_DOS_DiskNo]
  1582 00008D6A 770A                <1>         ja	short cd_drive_not_ready
  1583                              <1> 	
  1584 00008D6C 88C2                <1> 	mov	dl, al
  1585 00008D6E E85BF3FFFF          <1> 	call 	change_current_drive
  1586 00008D73 7201                <1> 	jc	short cd_drive_not_ready	
  1587 00008D75 C3                  <1> 	retn
  1588                              <1> 
  1589                              <1> cd_drive_not_ready:
  1590 00008D76 BE[E23A0100]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1591 00008D7B E8C5E7FFFF          <1> 	call	print_msg
  1592                              <1> 
  1593                              <1> cd_fail_drive_restart:
  1594 00008D80 8A15[56820100]      <1> 	mov	dl, [Current_Drv]
  1595                              <1> 	;call 	change_current_drive
  1596 00008D86 E943F3FFFF          <1>         jmp     change_current_drive
  1597                              <1> 	;retn
  1598                              <1> 
  1599                              <1> cd_command_failed:
  1600 00008D8B BE[C33A0100]        <1> 	mov	esi, Msg_Bad_Command
  1601 00008D90 E8B0E7FFFF          <1> 	call	print_msg
  1602 00008D95 EBE9                <1> 	jmp	short cd_fail_drive_restart
  1603                              <1> 
  1604                              <1> c_3:
  1605                              <1> cmp_cmd_dir:
  1606 00008D97 BF[82380100]        <1> 	mov	edi, Cmd_Dir
  1607 00008D9C E8D3010000          <1> 	call	cmp_cmd	
  1608 00008DA1 0F8380020000        <1> 	jnc	print_directory_list
  1609                              <1> 
  1610                              <1> cmp_cmd_cls:
  1611 00008DA7 B103                <1> 	mov	cl, 3
  1612 00008DA9 BF[BE380100]        <1> 	mov	edi, Cmd_Cls
  1613 00008DAE E8C1010000          <1> 	call	cmp_cmd	
  1614 00008DB3 0F83A2E7FFFF        <1>         jnc	clear_screen
  1615                              <1> 
  1616                              <1> cmp_cmd_ver:
  1617 00008DB9 B103                <1> 	mov	cl, 3
  1618 00008DBB BF[8C380100]        <1> 	mov	edi, Cmd_Ver
  1619 00008DC0 E8AF010000          <1> 	call	cmp_cmd	
  1620 00008DC5 720A                <1> 	jc	short cmp_cmd_mem
  1621                              <1> 
  1622 00008DC7 BE[2A380100]        <1> 	mov	esi, mainprog_Version
  1623                              <1> 	;call	print_msg
  1624 00008DCC E974E7FFFF          <1> 	jmp	print_msg
  1625                              <1> 	;retn
  1626                              <1> 
  1627                              <1> cmp_cmd_mem:
  1628 00008DD1 B103                <1> 	mov	cl, 3
  1629 00008DD3 BF[F4380100]        <1> 	mov	edi, Cmd_Mem
  1630 00008DD8 E897010000          <1> 	call	cmp_cmd	
  1631 00008DDD 0F8352B4FFFF        <1> 	jnc	memory_info
  1632                              <1> 
  1633                              <1> cmp_cmd_del:
  1634 00008DE3 B103                <1> 	mov	cl, 3
  1635 00008DE5 BF[C7380100]        <1> 	mov	edi, Cmd_Del
  1636 00008DEA E885010000          <1> 	call	cmp_cmd	
  1637 00008DEF 0F83280F0000        <1>         jnc     delete_file
  1638                              <1> 
  1639                              <1> cmp_cmd_set:
  1640 00008DF5 B103                <1> 	mov	cl, 3
  1641 00008DF7 BF[BA380100]        <1> 	mov	edi, Cmd_Set
  1642 00008DFC E873010000          <1> 	call	cmp_cmd	
  1643 00008E01 0F83C9170000        <1>         jnc     set_get_env
  1644                              <1> 
  1645                              <1> cmp_cmd_run:
  1646 00008E07 B103                <1> 	mov	cl, 3
  1647 00008E09 BF[B6380100]        <1> 	mov	edi, Cmd_Run
  1648 00008E0E E861010000          <1> 	call	cmp_cmd	
  1649                              <1> 	; 07/05/2016
  1650 00008E13 0F823E010000        <1>         jc      cmp_cmd_external
  1651 00008E19 E90F1E0000          <1> 	jmp	load_and_execute_file
  1652                              <1> c_5:
  1653                              <1> cmp_cmd_mkdir:
  1654 00008E1E BF[DF380100]        <1> 	mov	edi, Cmd_Mkdir
  1655 00008E23 E84C010000          <1> 	call	cmp_cmd	
  1656 00008E28 0F83990A0000        <1>         jnc     make_directory
  1657                              <1> 
  1658                              <1> cmp_cmd_rmdir:
  1659 00008E2E B105                <1> 	mov	cl, 5
  1660 00008E30 BF[D9380100]        <1> 	mov	edi, Cmd_Rmdir
  1661 00008E35 E83A010000          <1> 	call	cmp_cmd	
  1662 00008E3A 0F83AA0B0000        <1>         jnc     delete_directory
  1663                              <1> 
  1664                              <1> cmp_cmd_chdir:
  1665 00008E40 B105                <1> 	mov	cl, 5
  1666 00008E42 BF[16390100]        <1> 	mov	edi, Cmd_Chdir
  1667 00008E47 E828010000          <1> 	call	cmp_cmd	
  1668 00008E4C 0F8205010000        <1>         jc      cmp_cmd_external
  1669                              <1> 
  1670 00008E52 E9A1FEFFFF          <1> 	jmp	cd_0
  1671                              <1> 
  1672                              <1> c_6:
  1673 00008E57 80F906              <1> 	cmp	cl, 6
  1674 00008E5A 0F87E0000000        <1>         ja      c_8
  1675 00008E60 72BC                <1> 	jb	short c_5
  1676                              <1> cmp_cmd_prompt:
  1677 00008E62 BF[95380100]        <1> 	mov	edi, Cmd_Prompt
  1678 00008E67 E808010000          <1> 	call	cmp_cmd	
  1679 00008E6C 722F                <1>         jc	short cmp_cmd_volume
  1680                              <1> get_prompt_name_fchar:
  1681 00008E6E AC                  <1> 	lodsb
  1682 00008E6F 3C20                <1> 	cmp	al, 20h
  1683 00008E71 74FB                <1> 	je	short get_prompt_name_fchar
  1684 00008E73 7713                <1> 	ja	short loc_change_prompt_label
  1685                              <1> default_command_prompt: ; 31/12/2017 ('sysprompt')
  1686 00008E75 BE[76380100]        <1> 	mov	esi, TRDOSPromptLabel
  1687 00008E7A C7065452444F        <1> 	mov	dword [esi], "TRDO"
  1688 00008E80 66C746045300        <1>        	mov	word [esi+4], "S" 
  1689                              <1> loc_cmd_prompt_return:
  1690 00008E86 C3                  <1> 	retn
  1691                              <1> 
  1692                              <1> set_command_prompt: ; 31/12/2017 ('sysprompt')
  1693 00008E87 AC                  <1> 	lodsb
  1694                              <1> loc_change_prompt_label:
  1695 00008E88 66B90B00            <1> 	mov	cx, 11
  1696 00008E8C BF[76380100]        <1> 	mov	edi, TRDOSPromptLabel
  1697                              <1> put_char_new_prompt_label:
  1698 00008E91 AA                  <1> 	stosb
  1699 00008E92 AC                  <1> 	lodsb
  1700 00008E93 3C20                <1> 	cmp	al, 20h
  1701 00008E95 7202                <1> 	jb	short pass_put_new_prompt_label
  1702 00008E97 E2F8                <1> 	loop	put_char_new_prompt_label
  1703                              <1> pass_put_new_prompt_label:
  1704 00008E99 C60700              <1> 	mov	byte [edi], 0
  1705 00008E9C C3                  <1> 	retn
  1706                              <1> 
  1707                              <1> cmp_cmd_volume:
  1708 00008E9D B106                <1> 	mov	cl, 6
  1709 00008E9F BF[9C380100]        <1> 	mov	edi, Cmd_Volume
  1710 00008EA4 E8CB000000          <1> 	call	cmp_cmd	
  1711 00008EA9 7255                <1>         jc	short cmp_cmd_attrib
  1712                              <1> 
  1713                              <1> cmd_vol1:
  1714 00008EAB AC                  <1> 	lodsb
  1715 00008EAC 3C20                <1> 	cmp	al, 20h
  1716 00008EAE 7707                <1> 	ja	short cmd_vol2
  1717 00008EB0 A0[56820100]        <1> 	mov	al, [Current_Drv]
  1718 00008EB5 EB3D                <1> 	jmp	short cmd_vol4
  1719                              <1> cmd_vol2:
  1720 00008EB7 3C41                <1> 	cmp	al, 'A'
  1721 00008EB9 0F82A2000000        <1>         jb      loc_cmd_failed
  1722 00008EBF 3C7A                <1> 	cmp	al, 'z'
  1723 00008EC1 0F879A000000        <1>         ja      loc_cmd_failed
  1724 00008EC7 3C5A                <1> 	cmp	al, 'Z'
  1725 00008EC9 760A                <1> 	jna	short cmd_vol3
  1726 00008ECB 3C61                <1> 	cmp	al, 'a'
  1727 00008ECD 0F828E000000        <1>         jb      loc_cmd_failed
  1728 00008ED3 24DF                <1> 	and	al, 0DFh
  1729                              <1> cmd_vol3:
  1730 00008ED5 8A26                <1> 	mov	ah, [esi]
  1731 00008ED7 80FC3A              <1> 	cmp	ah, ':'
  1732 00008EDA 0F8581000000        <1>         jne     loc_cmd_failed
  1733 00008EE0 2C41                <1> 	sub	al, 'A'
  1734 00008EE2 3A05[22380100]      <1>         cmp     al, [Last_DOS_DiskNo]
  1735 00008EE8 760A                <1> 	jna	short cmd_vol4
  1736                              <1> 
  1737 00008EEA BE[E23A0100]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1738 00008EEF E951E6FFFF          <1> 	jmp	print_msg
  1739                              <1> 	
  1740                              <1> cmd_vol4:
  1741 00008EF4 E88EFAFFFF          <1> 	call	print_volume_info
  1742 00008EF9 0F8277FEFFFF        <1>         jc      cd_drive_not_ready
  1743 00008EFF C3                  <1> 	retn
  1744                              <1> 
  1745                              <1> cmp_cmd_attrib:
  1746 00008F00 B106                <1> 	mov	cl, 6
  1747 00008F02 BF[CB380100]        <1> 	mov	edi, Cmd_Attrib
  1748 00008F07 E868000000          <1> 	call	cmp_cmd	
  1749 00008F0C 0F831D0F0000        <1>         jnc     set_file_attributes
  1750                              <1> 
  1751                              <1> cmp_cmd_rename:
  1752 00008F12 B106                <1> 	mov	cl, 6
  1753 00008F14 BF[D2380100]        <1> 	mov	edi, Cmd_Rename
  1754 00008F19 E856000000          <1> 	call	cmp_cmd	
  1755 00008F1E 0F8353110000        <1>         jnc     rename_file
  1756                              <1> 
  1757                              <1> cmp_cmd_device:
  1758 00008F24 B106                <1> 	mov	cl, 6
  1759 00008F26 BF[07390100]        <1> 	mov	edi, Cmd_Device
  1760 00008F2B E844000000          <1> 	call	cmp_cmd	
  1761 00008F30 7225                <1>         jc	short cmp_cmd_external
  1762                              <1> 
  1763 00008F32 C3                  <1> 	retn
  1764                              <1> 
  1765                              <1> c_7:
  1766                              <1> cmp_cmd_devlist:
  1767 00008F33 BF[0E390100]        <1> 	mov	edi, Cmd_DevList
  1768 00008F38 E837000000          <1> 	call	cmp_cmd	
  1769 00008F3D 7218                <1>         jc	short cmp_cmd_external
  1770                              <1> 
  1771                              <1> loc_cmd_return:
  1772 00008F3F C3                  <1> 	retn
  1773                              <1> 
  1774                              <1> c_8:
  1775 00008F40 80F908              <1>         cmp	cl, 8
  1776 00008F43 7712                <1> 	ja	short cmp_cmd_external
  1777 00008F45 72EC                <1> 	jb	short c_7
  1778                              <1> 
  1779                              <1> cmp_cmd_longname:
  1780 00008F47 BF[A3380100]        <1> 	mov	edi, Cmd_LongName
  1781 00008F4C E823000000          <1> 	call	cmp_cmd	
  1782 00008F51 0F8350060000        <1>         jnc     get_and_print_longname
  1783                              <1> 
  1784                              <1> cmp_cmd_external:
  1785                              <1> 	; 07/05/2016
  1786                              <1> 	; 22/04/2016
  1787 00008F57 BE[06830100]        <1> 	mov	esi, CommandBuffer
  1788 00008F5C E9CC1C0000          <1> 	jmp	loc_run_check_filename 
  1789                              <1> 
  1790                              <1> loc_cmd_failed:
  1791 00008F61 803D[06830100]20    <1> 	cmp	byte [CommandBuffer], 20h
  1792 00008F68 76D5                <1> 	jna	short loc_cmd_return
  1793 00008F6A BE[C33A0100]        <1> 	mov	esi, Msg_Bad_Command
  1794                              <1> ;	call	print_msg
  1795                              <1> ;loc_cmd_return:
  1796                              <1> ;	retn
  1797 00008F6F E9D1E5FFFF          <1> 	jmp	print_msg
  1798                              <1> 
  1799                              <1> cmp_cmd:
  1800                              <1> 	 ; 29/01/2016 (TRDOS 386 = TRDOS v2.0)
  1801 00008F74 BE[06830100]        <1>          mov	esi, CommandBuffer
  1802                              <1>          ; edi = internal command word (ASCIIZ)
  1803                              <1> 	 ; ecx = command length (<=8)
  1804                              <1> cmp_cmd_1:
  1805 00008F79 AC                  <1> 	lodsb
  1806 00008F7A AE                  <1> 	scasb
  1807 00008F7B 750D                <1> 	jne	short cmp_cmd_3
  1808 00008F7D E2FA                <1> 	loop	cmp_cmd_1
  1809 00008F7F AC                  <1>  	lodsb
  1810 00008F80 3C20                <1> 	cmp	al, 20h
  1811 00008F82 7703                <1> 	ja	short cmp_cmd_2
  1812 00008F84 30C0                <1> 	xor	al, al
  1813                              <1> 	; ZF = 1 -> internal command word matches
  1814 00008F86 C3                  <1> 	retn
  1815                              <1> cmp_cmd_2:
  1816                              <1> 	; ZF = 0 (CF = 0) -> external command word 	
  1817 00008F87 58                  <1> 	pop	eax ; no return to the caller from here 
  1818 00008F88 EBCD                <1> 	jmp	cmp_cmd_external	
  1819                              <1> cmp_cmd_3:
  1820 00008F8A F9                  <1> 	stc
  1821                              <1> 	; CF = 1 -> internal command word does not match
  1822 00008F8B C3                  <1> 	retn
  1823                              <1> 
  1824                              <1> loc_run_cmd_failed:
  1825                              <1> 	; 15/03/2016
  1826                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  1827                              <1> 	; 07/12/2009 (CMD_INTR.ASM)	
  1828                              <1> 	; 29/11/2009
  1829                              <1> 
  1830 00008F8C E863000000          <1> 	call	restore_cdir_after_cmd_fail
  1831                              <1> 
  1832                              <1> loc_run_cmd_failed_cmp_al:
  1833                              <1> 	; End of Restore_CDIR code (29/11/2009)
  1834                              <1> 
  1835 00008F91 3C01                <1> 	cmp	al, 1 ; Bad command or file name
  1836 00008F93 74CC                <1> 	je	loc_cmd_failed
  1837                              <1> loc_run_dir_not_found:
  1838 00008F95 3C03                <1> 	cmp	al, 3
  1839 00008F97 750A                <1> 	jne	short loc_run_file_notfound_msg
  1840                              <1> 	; Path not found (MS-DOS Error Code = 3)
  1841 00008F99 BE[253B0100]        <1> 	mov	esi, Msg_Dir_Not_Found
  1842 00008F9E E9A2E5FFFF          <1> 	jmp	print_msg
  1843                              <1> 
  1844                              <1> loc_run_file_notfound_msg:
  1845 00008FA3 3C02                <1> 	cmp	al, 2 ; File not found
  1846 00008FA5 750A                <1> 	jne	short loc_run_file_drv_read_err
  1847                              <1> 
  1848                              <1> loc_print_file_notfound_msg: 
  1849 00008FA7 BE[3C3B0100]        <1>         mov     esi, Msg_File_Not_Found
  1850                              <1> 	;call	proc_printmsg
  1851                              <1> 	;retn
  1852 00008FAC E994E5FFFF          <1> 	jmp	print_msg
  1853                              <1> 
  1854                              <1> loc_run_file_drv_read_err:
  1855                              <1> 	; Err: 17 (Read fault)
  1856 00008FB1 3C11                <1> 	cmp	al, 17 ; Drive not ready or read error
  1857 00008FB3 7404                <1> 	je	short loc_run_file_print_drv_read_err
  1858                              <1> 	;
  1859 00008FB5 3C0F                <1> 	cmp	al, 15 ; Drive not ready (or read error)
  1860 00008FB7 750A                <1> 	jne	short loc_run_file_toobig
  1861                              <1> 
  1862                              <1> loc_run_file_print_drv_read_err:
  1863 00008FB9 BE[E23A0100]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1864 00008FBE E982E5FFFF          <1> 	jmp	print_msg
  1865                              <1> 
  1866                              <1> loc_run_file_toobig:
  1867 00008FC3 3C08                <1> 	cmp	al, 8 ; Not enough free memory to load&run file
  1868 00008FC5 750A                <1> 	jne	short loc_run_file_perm_denied
  1869 00008FC7 BE[873B0100]        <1> 	mov	esi, Msg_Insufficient_Memory
  1870 00008FCC E974E5FFFF          <1> 	jmp	print_msg
  1871                              <1> 
  1872                              <1> loc_run_file_perm_denied:
  1873                              <1> 	; 29/12/2017
  1874 00008FD1 3C0B                <1> 	cmp	al, ERR_PERM_DENIED ; 11 ; Permission denied
  1875 00008FD3 750A                <1> 	jne	short loc_run_misc_error
  1876 00008FD5 BE[1C3D0100]        <1> 	mov	esi, Msg_Permission_Denied
  1877 00008FDA E966E5FFFF          <1> 	jmp	print_msg	
  1878                              <1> 
  1879                              <1> 	; 15/03/2016
  1880                              <1> print_misc_error_msg:
  1881                              <1> loc_run_misc_error:
  1882                              <1> 	; AL = Error code
  1883 00008FDF E8DFB2FFFF          <1> 	call	bytetohex
  1884 00008FE4 66A3[BB3B0100]      <1>         mov     [error_code_hex], ax
  1885                              <1> 	
  1886 00008FEA BE[9E3B0100]        <1> 	mov	esi, Msg_Error_Code 
  1887                              <1> 	;call	print_msg 
  1888                              <1> 	;retn
  1889                              <1> 
  1890 00008FEF E951E5FFFF          <1> 	jmp	print_msg
  1891                              <1> 
  1892                              <1> restore_cdir_after_cmd_fail:
  1893                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  1894 00008FF4 50                  <1> 	push	eax
  1895 00008FF5 8A3D[B2890100]      <1> 	mov	bh, [RUN_CDRV] ; it is set at the beginning
  1896                              <1> 				; of the 'run' command.
  1897 00008FFB 3A3D[56820100]      <1> 	cmp	bh, [Current_Drv]
  1898 00009001 7409                <1> 	je	short loc_run_restore_cdir
  1899 00009003 88FA                <1> 	mov	dl, bh
  1900 00009005 E8C4F0FFFF          <1> 	call	change_current_drive 
  1901 0000900A EB19                <1> 	jmp	short loc_run_err_pass_restore_cdir
  1902                              <1> 
  1903                              <1> loc_run_restore_cdir:
  1904 0000900C 803D[23380100]00    <1> 	cmp	byte [Restore_CDIR], 0
  1905 00009013 7610                <1> 	jna	short loc_run_err_pass_restore_cdir
  1906 00009015 30DB                <1> 	xor	bl, bl
  1907 00009017 0FB7F3              <1> 	movzx	esi, bx
  1908 0000901A 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1909 00009020 E860F1FFFF          <1> 	call	restore_current_directory
  1910                              <1> 
  1911                              <1> loc_run_err_pass_restore_cdir:
  1912 00009025 58                  <1> 	pop	eax
  1913 00009026 C3                  <1> 	retn
  1914                              <1> 
  1915                              <1> print_directory_list:
  1916                              <1> 	; 10/02/2016
  1917                              <1> 	; 08/02/2016 (TRDOS 386 = TRDOS v2.0)
  1918                              <1> 	; 06/12/2009 ('cmp_cmd_dir')	
  1919                              <1> 	;
  1920 00009027 66C705[F48A0100]00- <1> 	mov	word [AttributesMask], 0800h ; ..except volume names..
  1920 0000902F 08                  <1>
  1921 00009030 A0[56820100]        <1> 	mov	al, [Current_Drv]
  1922 00009035 A2[B2890100]        <1> 	mov	[RUN_CDRV], al
  1923                              <1> get_dfname_fchar:
  1924 0000903A AC                  <1> 	lodsb
  1925 0000903B 3C20                <1> 	cmp	al, 20h
  1926 0000903D 74FB                <1> 	je	short get_dfname_fchar
  1927 0000903F 0F82A4000000        <1>         jb      loc_print_dir_call_all
  1928 00009045 3C2D                <1> 	cmp	al, '-'
  1929 00009047 7542                <1> 	jne	short loc_print_dir_call_flt
  1930                              <1> get_next_attr_char:
  1931 00009049 AC                  <1> 	lodsb
  1932 0000904A 3C20                <1> 	cmp	al, 20h
  1933 0000904C 74FB                <1> 	je	short get_next_attr_char
  1934 0000904E 0F820DFFFFFF        <1>         jb      loc_cmd_failed
  1935 00009054 24DF                <1> 	and	al, 0DFh
  1936 00009056 3C44                <1> 	cmp	al, 'D' ; directories only ?
  1937 00009058 7512                <1> 	jne	short pass_only_directories
  1938 0000905A AC                  <1> 	lodsb
  1939 0000905B 3C20                <1> 	cmp	al, 20h
  1940 0000905D 0F87FEFEFFFF        <1>         ja      loc_cmd_failed
  1941 00009063 800D[F48A0100]10    <1> 	or	byte [AttributesMask], 10h ; ..directory..
  1942 0000906A EB18                <1> 	jmp	short get_dfname_fchar_attr
  1943                              <1> pass_only_directories:
  1944 0000906C 3C46                <1> 	cmp	al, 'F'	; files only ?
  1945 0000906E 0F85B0000000        <1>         jne     check_attr_s
  1946 00009074 AC                  <1> 	lodsb
  1947 00009075 3C20                <1> 	cmp	al, 20h
  1948 00009077 0F87E4FEFFFF        <1>         ja      loc_cmd_failed
  1949 0000907D 800D[F58A0100]10    <1> 	or	byte [AttributesMask+1], 10h ; ..except directories..
  1950                              <1> get_dfname_fchar_attr:
  1951 00009084 AC                  <1> 	lodsb
  1952 00009085 3C20                <1> 	cmp	al, 20h
  1953 00009087 74FB                <1> 	je	short get_dfname_fchar_attr
  1954 00009089 725E                <1> 	jb	short loc_print_dir_call_all
  1955                              <1> 
  1956                              <1> loc_print_dir_call_flt:
  1957 0000908B 4E                  <1> 	dec	esi
  1958 0000908C BF[F68A0100]        <1> 	mov	edi, FindFile_Drv
  1959 00009091 E8AC250000          <1> 	call	parse_path_name
  1960 00009096 7308                <1>  	jnc	short loc_print_dir_change_drv_1
  1961 00009098 3C01                <1> 	cmp	al, 1
  1962 0000909A 0F87ECFEFFFF        <1>         ja      loc_run_cmd_failed
  1963                              <1> 
  1964                              <1> loc_print_dir_change_drv_1:
  1965 000090A0 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
  1966                              <1> loc_print_dir_change_drv_2:
  1967 000090A6 3A15[B2890100]      <1> 	cmp	dl, [RUN_CDRV]
  1968 000090AC 740B                <1> 	je	short loc_print_dir_change_directory 
  1969 000090AE E81BF0FFFF          <1> 	call	change_current_drive
  1970 000090B3 0F82D3FEFFFF        <1>         jc      loc_run_cmd_failed
  1971                              <1> loc_print_dir_change_directory:
  1972 000090B9 803D[F78A0100]20    <1> 	cmp	byte [FindFile_Directory], 20h ; 0 or 20h ?
  1973 000090C0 761D                <1> 	jna	short pass_print_dir_change_directory
  1974                              <1> 
  1975 000090C2 FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  1976 000090C8 BE[F78A0100]        <1> 	mov	esi, FindFile_Directory
  1977 000090CD 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  1978 000090CF E8581F0000          <1> 	call	change_current_directory
  1979 000090D4 0F82B2FEFFFF        <1>         jc      loc_run_cmd_failed
  1980                              <1> 
  1981                              <1> loc_print_dir_change_prompt_dir_string:
  1982 000090DA E86D1E0000          <1> 	call	change_prompt_dir_string
  1983                              <1> 
  1984                              <1> pass_print_dir_change_directory:
  1985 000090DF BE[388B0100]        <1> 	mov	esi, FindFile_Name
  1986 000090E4 803E20              <1> 	cmp	byte [esi], 20h ; ; 0 or 20h ?
  1987 000090E7 7706                <1> 	ja	short loc_print_dir_call
  1988                              <1> 
  1989                              <1> loc_print_dir_call_all:
  1990 000090E9 C7062A2E2A00        <1> 	mov	dword [esi], '*.*'
  1991                              <1> loc_print_dir_call:
  1992 000090EF E87E000000          <1> 	call	print_directory
  1993                              <1> 
  1994 000090F4 8A15[B2890100]      <1> 	mov	dl, [RUN_CDRV]  ; it is set at the beginning
  1995 000090FA 3A15[56820100]      <1> 	cmp	dl, [Current_Drv]
  1996 00009100 7406                <1> 	je	short loc_print_dir_call_restore_cdir_retn
  1997 00009102 E8C7EFFFFF          <1> 	call	change_current_drive 
  1998 00009107 C3                  <1> 	retn
  1999                              <1> 
  2000                              <1> loc_print_dir_call_restore_cdir_retn:
  2001 00009108 803D[23380100]00    <1> 	cmp	byte [Restore_CDIR], 0
  2002 0000910F 7610                <1> 	jna	short pass_print_dir_call_restore_cdir_retn
  2003                              <1> 
  2004 00009111 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2005 00009116 31C0                <1> 	xor	eax, eax
  2006 00009118 88D4                <1> 	mov	ah, dl
  2007 0000911A 01C6                <1> 	add	esi, eax
  2008                              <1> 
  2009 0000911C E864F0FFFF          <1> 	call	restore_current_directory
  2010                              <1> 
  2011                              <1> pass_print_dir_call_restore_cdir_retn:
  2012 00009121 C3                  <1> 	retn
  2013                              <1> 
  2014                              <1> check_attr_s_cap:
  2015 00009122 24DF                <1> 	and	al, 0DFh
  2016                              <1> check_attr_s:
  2017 00009124 3C53                <1> 	cmp	al, 'S'
  2018 00009126 7514                <1> 	jne	short pass_attr_s
  2019 00009128 800D[F48A0100]04    <1> 	or	byte [AttributesMask], 4 ; system
  2020 0000912F AC                  <1> 	lodsb
  2021 00009130 3C20                <1> 	cmp	al, 20h
  2022 00009132 0F844CFFFFFF        <1>         je      get_dfname_fchar_attr
  2023 00009138 72AF                <1> 	jb	short loc_print_dir_call_all
  2024 0000913A 24DF                <1> 	and	al, 0DFh
  2025                              <1> pass_attr_s:
  2026 0000913C 3C48                <1> 	cmp	al, 'H'
  2027 0000913E 7514                <1> 	jne	short pass_attr_h
  2028 00009140 800D[F48A0100]02    <1> 	or	byte [AttributesMask], 2 ; hidden
  2029                              <1> pass_attr_shr:
  2030 00009147 AC                  <1> 	lodsb
  2031 00009148 3C20                <1> 	cmp	al, 20h
  2032 0000914A 0F8434FFFFFF        <1>         je      get_dfname_fchar_attr
  2033 00009150 7297                <1> 	jb	short loc_print_dir_call_all
  2034 00009152 EBCE                <1> 	jmp	short check_attr_s_cap
  2035                              <1> 
  2036                              <1> pass_attr_h:
  2037 00009154 3C52                <1> 	cmp	al, 'R'
  2038 00009156 7509                <1> 	jne	short pass_attr_r
  2039 00009158 800D[F48A0100]01    <1> 	or	byte [AttributesMask], 1 ; read only
  2040 0000915F EBE6                <1> 	jmp	short pass_attr_shr
  2041                              <1> 
  2042                              <1> pass_attr_r:
  2043 00009161 3C41                <1> 	cmp	al, 'A'
  2044 00009163 0F85F8FDFFFF        <1>         jne     loc_cmd_failed
  2045 00009169 800D[F48A0100]20    <1> 	or	byte [AttributesMask], 20h ; archive
  2046 00009170 EBD5                <1> 	jmp	short pass_attr_shr
  2047                              <1> 
  2048                              <1> print_directory:
  2049                              <1> 	; 13/05/2016
  2050                              <1> 	; 11/02/2016
  2051                              <1> 	; 10/02/2016
  2052                              <1> 	; 08/02/2016 (TRDOS 386 = TRDOS v2.0)
  2053                              <1> 	; 30/10/2010 ('proc_print_directory')	
  2054                              <1> 	; 19/09/2009
  2055                              <1> 	; 2005 
  2056                              <1> 	; INPUT ->
  2057                              <1> 	;	ESI = Asciiz File/Dir Name Address
  2058                              <1> 
  2059 00009172 56                  <1> 	push	esi
  2060                              <1> 
  2061 00009173 29C0                <1> 	sub	eax, eax
  2062                              <1> 
  2063 00009175 66A3[808B0100]      <1> 	mov	word [Dir_Count], ax ; 0
  2064 0000917B 66A3[7E8B0100]      <1> 	mov 	word [File_Count], ax ; 0
  2065 00009181 A3[828B0100]        <1> 	mov 	dword [Total_FSize], eax ; 0
  2066                              <1> 
  2067 00009186 E8D0E3FFFF          <1> 	call    clear_screen
  2068                              <1> 	
  2069 0000918B 31C9                <1> 	xor	ecx, ecx	
  2070 0000918D 8A2D[56820100]      <1> 	mov     ch, [Current_Drv] ; DirBuff_Drv - 'A'
  2071 00009193 A0[57820100]        <1> 	mov     al, [Current_Dir_Drv] 
  2072 00009198 A2[E0390100]        <1> 	mov     [Dir_Drive_Name], al
  2073 0000919D BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2074 000091A2 01CE                <1> 	add	esi, ecx
  2075                              <1> 
  2076 000091A4 E858F9FFFF          <1> 	call	move_volume_name_and_serial_no
  2077 000091A9 730C                <1> 	jnc	short print_dir_strlen_check
  2078                              <1> 
  2079 000091AB 5E                  <1> 	pop	esi
  2080 000091AC 8A3D[BE810100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
  2081                              <1> 	;call	beeper
  2082                              <1> 	;retn
  2083 000091B2 E92A92FFFF          <1> 	jmp	beeper  ; beep ! and return
  2084                              <1> 
  2085                              <1> print_dir_strlen_check:
  2086 000091B7 BE[59820100]        <1> 	mov	esi, Current_Dir_Root
  2087 000091BC BF[7D3A0100]        <1> 	mov	edi, Dir_Str_Root
  2088                              <1> 	
  2089                              <1> 	;xor	ecx, ecx
  2090 000091C1 8A0D[B5820100]      <1>         mov     cl, [Current_Dir_StrLen]
  2091 000091C7 FEC1                <1> 	inc	cl
  2092 000091C9 80F940              <1> 	cmp	cl, 64
  2093 000091CC 760D                <1> 	jna	short pass_print_dir_strlen_shorting
  2094 000091CE 46                  <1> 	inc	esi
  2095 000091CF 01CE                <1> 	add	esi, ecx
  2096 000091D1 83EE40              <1> 	sub	esi, 64 
  2097 000091D4 47                  <1> 	inc	edi
  2098 000091D5 B82E2E2E20          <1> 	mov	eax, '... ' 
  2099 000091DA AB                  <1> 	stosd
  2100                              <1>  
  2101                              <1> pass_print_dir_strlen_shorting:
  2102 000091DB F3A4                <1> 	rep	movsb
  2103                              <1> 
  2104 000091DD BE[D3390100]        <1> 	mov	esi, Dir_Drive_Str
  2105 000091E2 E85EE3FFFF          <1> 	call	print_msg
  2106                              <1> 
  2107 000091E7 BE[323A0100]        <1> 	mov	esi, Vol_Serial_Header
  2108 000091EC E854E3FFFF          <1> 	call	print_msg
  2109                              <1> 
  2110 000091F1 BE[723A0100]        <1> 	mov	esi, Dir_Str_Header
  2111 000091F6 E84AE3FFFF          <1> 	call	print_msg
  2112                              <1> 	
  2113 000091FB BE[BD440100]        <1> 	mov	esi, next2line
  2114 00009200 E840E3FFFF          <1> 	call	print_msg
  2115                              <1> 
  2116                              <1> loc_print_dir_first_file:
  2117 00009205 C605[958B0100]10    <1> 	mov	byte [PrintDir_RowCounter], 16
  2118 0000920C 66A1[F48A0100]      <1> 	mov	ax, [AttributesMask]
  2119 00009212 5E                  <1> 	pop	esi
  2120                              <1> 
  2121 00009213 E859020000          <1> 	call	find_first_file
  2122 00009218 0F826F010000        <1>         jc      loc_dir_ok
  2123                              <1> 	 
  2124                              <1> loc_dfname_use_this:
  2125                              <1> 	; bl =	File Attributes (bh = Long Name Entry Length)
  2126 0000921E F6C310              <1> 	test	bl, 10h  ; Is it a directory?
  2127 00009221 741B                <1> 	jz	short loc_not_dir
  2128                              <1> 
  2129 00009223 66FF05[808B0100]    <1> 	inc	word [Dir_Count]
  2130 0000922A 89F2                <1> 	mov	edx, esi 	; FindFile_DirEntry address
  2131 0000922C BE[C23B0100]        <1>  	mov	esi, Type_Dir	; '<DIR>     '
  2132 00009231 BF[D93B0100]        <1> 	mov	edi, Dir_Or_FileSize
  2133                              <1> 	; move 10 bytes
  2134 00009236 A5                  <1> 	movsd
  2135 00009237 A5                  <1> 	movsd
  2136 00009238 66A5                <1> 	movsw	    	
  2137 0000923A 89D6                <1> 	mov	esi, edx
  2138 0000923C EB36                <1> 	jmp     short loc_dir_attribute
  2139                              <1> 
  2140                              <1> loc_not_dir:
  2141 0000923E 66FF05[7E8B0100]    <1> 	inc	word [File_Count]
  2142 00009245 0105[828B0100]      <1> 	add	[Total_FSize], eax
  2143                              <1> 
  2144 0000924B B90A000000          <1> 	mov	ecx, 10  ; 32 bit divisor
  2145 00009250 89CF                <1> 	mov	edi, ecx
  2146 00009252 81C7[D93B0100]      <1> 	add	edi, Dir_Or_FileSize
  2147                              <1> loc_dir_rdivide:
  2148 00009258 29D2                <1> 	sub	edx, edx
  2149 0000925A F7F1                <1> 	div	ecx 	 ; remainder in dl (< 10)
  2150 0000925C 80C230              <1> 	add     dl, '0'	 ; to make visible (ascii)
  2151 0000925F 4F                  <1> 	dec	edi
  2152 00009260 8817                <1> 	mov     [edi], dl
  2153 00009262 21C0                <1> 	and	eax, eax
  2154 00009264 75F2                <1> 	jnz	short loc_dir_rdivide
  2155                              <1> 
  2156                              <1> loc_dir_fill_space:
  2157 00009266 81FF[D93B0100]      <1> 	cmp     edi, Dir_Or_FileSize
  2158 0000926C 7606                <1> 	jna     short loc_dir_attribute
  2159 0000926E 4F                  <1> 	dec     edi
  2160 0000926F C60720              <1> 	mov     byte [edi], 20h
  2161 00009272 EBF2                <1> 	jmp     short loc_dir_fill_space
  2162                              <1> 
  2163                              <1> loc_dir_attribute:
  2164 00009274 C705[E43B0100]2020- <1> 	mov	dword [File_Attribute], 20202020h
  2164 0000927C 2020                <1>
  2165                              <1> 
  2166 0000927E 80FB20              <1> 	cmp	bl, 20h  ; Is it an archive file?
  2167 00009281 7207                <1> 	jb	short loc_dir_pass_arch
  2168 00009283 C605[E73B0100]41    <1> 	mov	byte [File_Attribute+3], 'A'
  2169                              <1> 
  2170                              <1> loc_dir_pass_arch:
  2171 0000928A 80E307              <1> 	and	bl, 7
  2172 0000928D 7428                <1> 	jz	short loc_dir_file_name
  2173 0000928F 88DF                <1> 	mov	bh, bl
  2174 00009291 80E303              <1> 	and	bl, 3
  2175 00009294 38DF                <1> 	cmp	bh, bl
  2176 00009296 7607                <1> 	jna	short loc_dir_pass_s
  2177 00009298 C605[E43B0100]53    <1> 	mov	byte [File_Attribute], 'S'
  2178                              <1> 
  2179                              <1> loc_dir_pass_s:
  2180 0000929F 80E302              <1> 	and     bl,2
  2181 000092A2 7407                <1> 	jz      short loc_dir_pass_h
  2182 000092A4 C605[E53B0100]48    <1> 	mov     byte [File_Attribute+1], 'H'
  2183                              <1> loc_dir_pass_h:
  2184 000092AB 80E701              <1> 	and     bh,1
  2185 000092AE 7407                <1> 	jz      short loc_dir_file_name
  2186 000092B0 C605[E63B0100]52    <1> 	mov     byte [File_Attribute+2], 'R'
  2187                              <1> loc_dir_file_name:
  2188                              <1> 	;mov     bx, [esi+18h] ; Date
  2189                              <1> 	;mov     dx, [esi+16h] ; Time
  2190 000092B7 8B5E16              <1> 	mov	ebx, [esi+16h]
  2191 000092BA 89F1                <1> 	mov	ecx, esi ; FindFile_DirEntry address
  2192 000092BC BF[CC3B0100]        <1> 	mov     edi, File_Name
  2193                              <1> 	; move 8 bytes
  2194 000092C1 A5                  <1> 	movsd
  2195 000092C2 A5                  <1> 	movsd
  2196 000092C3 C60720              <1> 	mov	byte [edi], 20h
  2197 000092C6 47                  <1> 	inc	edi
  2198                              <1> 	; move 3 bytes
  2199 000092C7 66A5                <1> 	movsw
  2200 000092C9 A4                  <1> 	movsb
  2201 000092CA 89CE                <1> 	mov	esi, ecx
  2202                              <1> 
  2203                              <1> Dir_Time_start:
  2204                              <1> 	;mov	ax, dx		; Time
  2205 000092CC 6689D8              <1> 	mov	ax, bx
  2206 000092CF 66C1E805            <1> 	shr	ax, 5		; shift right 5 times
  2207 000092D3 6683E03F            <1> 	and	ax, 0000111111b	; Minute Mask
  2208 000092D7 D40A                <1> 	aam			; Q([AL]/10)->AH
  2209                              <1> 				; R([AL]/10)->AL
  2210                              <1> 				; [AL]+[AH]= Minute as BCD
  2211 000092D9 660D3030            <1> 	or	ax, '00'	; Convert to ASCII
  2212 000092DD 86E0                <1> 	xchg	ah, al
  2213 000092DF 66A3[F73B0100]      <1> 	mov	[File_Minute], ax
  2214                              <1> 
  2215                              <1> 	;mov	al, dh
  2216 000092E5 88F8                <1> 	mov	al, bh
  2217 000092E7 C0E803              <1> 	shr	al, 3		; shift right 3 times
  2218 000092EA D40A                <1> 	aam			; [AL]+[AH]= Hours as BCD
  2219 000092EC 660D3030            <1> 	or	ax, '00'
  2220 000092F0 86E0                <1> 	xchg	ah, al
  2221 000092F2 66A3[F43B0100]      <1> 	mov     [File_Hour], ax
  2222                              <1> 
  2223 000092F8 C1EB10              <1> 	shr	ebx, 16		; BX = Date
  2224                              <1> 	
  2225                              <1> Dir_Date_start:
  2226 000092FB 6689D8              <1> 	mov	ax, bx		; Date
  2227 000092FE 6683E01F            <1> 	and	ax, 00011111b	; Day Mask
  2228 00009302 D40A                <1> 	aam			; Q([AL]/10)->AH
  2229                              <1> 				; R([AL]/10)->AL
  2230                              <1> 				; [AL]+[AH]= Day as BCD
  2231 00009304 660D3030            <1> 	or	ax, '00'	; Convert to ASCII
  2232 00009308 86C4                <1> 	xchg	al, ah
  2233                              <1> 
  2234 0000930A 66A3[E93B0100]      <1> 	mov	[File_Day], ax
  2235                              <1> 
  2236 00009310 6689D8              <1> 	mov	ax, bx
  2237 00009313 66C1E805            <1> 	shr	ax, 5		; shift right 5 times
  2238 00009317 6683E00F            <1> 	and	ax, 00001111b	; Month Mask
  2239 0000931B D40A                <1> 	aam
  2240 0000931D 660D3030            <1> 	or	ax, '00'
  2241 00009321 86E0                <1> 	xchg	ah, al
  2242 00009323 66A3[EC3B0100]      <1> 	mov	[File_Month], ax
  2243                              <1> 
  2244 00009329 6689D8              <1> 	mov	ax, bx
  2245 0000932C 66C1E809            <1> 	shr     ax, 9
  2246 00009330 6683E07F            <1> 	and	ax, 01111111b	; Result = Year - 1980
  2247 00009334 6605BC07            <1> 	add	ax, 1980
  2248                              <1> 
  2249 00009338 B10A                <1> 	mov	cl, 10
  2250 0000933A F6F1                <1> 	div	cl		; Q -> AL, R -> AH 
  2251 0000933C 80CC30              <1> 	or	ah, '0'
  2252 0000933F 8825[F23B0100]      <1> 	mov	[File_Year+3], ah
  2253 00009345 D40A                <1> 	aam
  2254 00009347 86E0                <1> 	xchg	ah, al
  2255 00009349 80CC30              <1> 	or	ah, '0'	  ; Convert to ASCII
  2256 0000934C 8825[F13B0100]      <1> 	mov	[File_Year+2], ah
  2257 00009352 D40A                <1> 	aam
  2258 00009354 86C4                <1> 	xchg	al, ah
  2259 00009356 660D3030            <1> 	or	ax, '00'
  2260 0000935A 66A3[EF3B0100]      <1> 	mov	[File_Year], ax
  2261                              <1> 
  2262                              <1> loc_show_line:
  2263 00009360 56                  <1> 	push	esi
  2264 00009361 BE[CC3B0100]        <1> 	mov     esi, File_Name
  2265 00009366 E8DAE1FFFF          <1> 	call	print_msg
  2266 0000936B BE[BF440100]        <1> 	mov	esi, nextline
  2267 00009370 E8D0E1FFFF          <1> 	call	print_msg
  2268 00009375 5E                  <1> 	pop	esi
  2269                              <1> 
  2270 00009376 FE0D[958B0100]      <1> 	dec	byte [PrintDir_RowCounter]
  2271 0000937C 0F84D4000000        <1>         jz      pause_dir_scroll
  2272                              <1> 
  2273                              <1> loc_next_entry:
  2274 00009382 E899010000          <1> 	call	find_next_file
  2275 00009387 0F8391FEFFFF        <1>         jnc     loc_dfname_use_this
  2276                              <1> 
  2277                              <1> loc_dir_ok:
  2278 0000938D B90A000000          <1> 	mov     ecx, 10
  2279 00009392 66A1[808B0100]      <1> 	mov	ax, [Dir_Count]
  2280 00009398 BF[0D3C0100]        <1> 	mov	edi, Decimal_Dir_Count
  2281 0000939D 6639C8              <1> 	cmp	ax, cx ; 10
  2282 000093A0 7216                <1> 	jb	short pass_ddc
  2283 000093A2 47                  <1> 	inc	edi
  2284 000093A3 6683F864            <1> 	cmp	ax, 100
  2285 000093A7 720F                <1> 	jb	short pass_ddc
  2286 000093A9 47                  <1> 	inc	edi
  2287 000093AA 663DE803            <1> 	cmp	ax, 1000
  2288 000093AE 7208                <1> 	jb	short pass_ddc
  2289 000093B0 47                  <1> 	inc	edi
  2290 000093B1 663D1027            <1> 	cmp	ax, 10000
  2291 000093B5 7201                <1> 	jb	short pass_ddc
  2292 000093B7 47                  <1> 	inc	edi
  2293                              <1> pass_ddc:
  2294 000093B8 886F01              <1> 	mov     [edi+1], ch ; 0
  2295                              <1> loc_ddc_rediv:
  2296 000093BB 31D2                <1> 	xor     edx, edx
  2297 000093BD 66F7F1              <1> 	div     cx	; 10
  2298 000093C0 80C230              <1> 	add     dl, '0'
  2299 000093C3 8817                <1> 	mov     [edi], dl
  2300 000093C5 4F                  <1> 	dec     edi
  2301 000093C6 6609C0              <1> 	or	ax, ax
  2302 000093C9 75F0                <1> 	jnz	short loc_ddc_rediv
  2303                              <1> 
  2304 000093CB 66A1[7E8B0100]      <1> 	mov     ax, [File_Count]
  2305 000093D1 BF[FC3B0100]        <1> 	mov     edi, Decimal_File_Count
  2306 000093D6 6639C8              <1> 	cmp     ax, cx ; 10
  2307 000093D9 7216                <1> 	jb      short pass_dfc
  2308 000093DB 47                  <1> 	inc     edi
  2309 000093DC 6683F864            <1> 	cmp     ax, 100
  2310 000093E0 720F                <1> 	jb      short pass_dfc
  2311 000093E2 47                  <1> 	inc     edi
  2312 000093E3 663DE803            <1> 	cmp     ax, 1000
  2313 000093E7 7208                <1> 	jb      short pass_dfc
  2314 000093E9 47                  <1> 	inc     edi
  2315 000093EA 663D1027            <1> 	cmp     ax, 10000
  2316 000093EE 7201                <1> 	jb      short pass_dfc
  2317 000093F0 47                  <1> 	inc     edi
  2318                              <1> pass_dfc:
  2319                              <1> 	;mov    cx, 10
  2320 000093F1 886F01              <1> 	mov     [edi+1], ch ; 00
  2321                              <1> loc_dfc_rediv:
  2322                              <1> 	;xor	dx, dx
  2323 000093F4 30D2                <1> 	xor	dl, dl
  2324 000093F6 66F7F1              <1> 	div	cx
  2325 000093F9 80C230              <1> 	add	dl, '0'
  2326 000093FC 8817                <1> 	mov	[edi], dl
  2327 000093FE 4F                  <1> 	dec	edi
  2328 000093FF 6609C0              <1> 	or	ax, ax
  2329 00009402 75F0                <1> 	jnz	short loc_dfc_rediv
  2330                              <1> 
  2331 00009404 BF[948B0100]        <1> 	mov     edi, TFS_Dec_End
  2332                              <1>         ;mov    byte [edi], 0
  2333 00009409 A1[828B0100]        <1> 	mov     eax, [Total_FSize]
  2334                              <1> 	;mov    ecx, 10
  2335                              <1> rediv_tfs_hex:
  2336                              <1> 	;sub	edx, edx
  2337 0000940E 28D2                <1> 	sub	dl, dl
  2338 00009410 F7F1                <1> 	div	ecx
  2339 00009412 80C230              <1> 	add	dl, '0'
  2340 00009415 4F                  <1> 	dec     edi
  2341 00009416 8817                <1> 	mov     [edi], dl
  2342 00009418 21C0                <1> 	and	eax, eax
  2343 0000941A 75F2                <1> 	jnz	short rediv_tfs_hex
  2344                              <1> 	
  2345 0000941C 893D[868B0100]      <1> 	mov	[TFS_Dec_Begin], edi
  2346 00009422 BE[FA3B0100]        <1> 	mov	esi, Decimal_File_Count_Header
  2347 00009427 E819E1FFFF          <1> 	call	print_msg
  2348 0000942C BE[023C0100]        <1> 	mov	esi, str_files
  2349 00009431 E80FE1FFFF          <1> 	call	print_msg
  2350 00009436 BE[133C0100]        <1> 	mov	esi, str_dirs
  2351 0000943B E805E1FFFF          <1> 	call	print_msg
  2352 00009440 8B35[868B0100]      <1> 	mov	esi, [TFS_Dec_Begin]
  2353 00009446 E8FAE0FFFF          <1> 	call	print_msg
  2354 0000944B BE[243C0100]        <1> 	mov	esi, str_bytes
  2355 00009450 E8F0E0FFFF          <1> 	call	print_msg
  2356                              <1> 
  2357 00009455 C3                  <1> 	retn
  2358                              <1> 
  2359                              <1> pause_dir_scroll:
  2360 00009456 28E4                <1> 	sub	ah, ah           
  2361 00009458 E8887AFFFF          <1> 	call	int16h
  2362 0000945D 3C1B                <1> 	cmp	al, 1Bh
  2363 0000945F 0F8428FFFFFF        <1>         je      loc_dir_ok
  2364 00009465 C605[958B0100]10    <1> 	mov	byte [PrintDir_RowCounter], 16 ; Reset counter
  2365 0000946C E911FFFFFF          <1>         jmp     loc_next_entry
  2366                              <1> 
  2367                              <1> find_first_file:
  2368                              <1> 	; 11/02/2016
  2369                              <1> 	; 10/02/2016
  2370                              <1> 	; 08/02/2016 (TRDOS 386 = TRDOS v2.0)
  2371                              <1> 	; 09/10/2011
  2372                              <1> 	; 17/09/2009
  2373                              <1> 	; 2005
  2374                              <1> 	; INPUT ->
  2375                              <1> 	;	ESI = ASCIIZ File/Dir Name Address (in Current Directory)
  2376                              <1> 	;	AL = Attributes AND mask (The AND result must be equal to AL)
  2377                              <1> 	;	      bit 0 = Read Only
  2378                              <1> 	;	      bir 1 = Hidden
  2379                              <1> 	;	      bit 2 = System
  2380                              <1> 	;	      bit 3 = Volume Label
  2381                              <1> 	;	      bit 4 = Directory
  2382                              <1> 	;	      bit 5 = Archive
  2383                              <1> 	;	      bit 6 = Reserved, must be 0
  2384                              <1> 	;	      bit 7 = Reserved, must be 0
  2385                              <1> 	;       AH = Attributes Negative AND mask (The AND result must be ZERO)
  2386                              <1> 	;
  2387                              <1> 	; OUTPUT ->
  2388                              <1> 	;	CF = 1 -> Error, Error Code in EAX (AL)
  2389                              <1> 	;	CF = 0 ->
  2390                              <1> 	;	     ESI = Directory Entry (FindFile_DirEntry) Location
  2391                              <1> 	;	     EDI = Directory Buffer Directory Entry Location
  2392                              <1> 	;	     EAX = File Size
  2393                              <1> 	;	      BL = Attributes of The File/Directory
  2394                              <1> 	;	      BH = Long Name Yes/No Status (>0 is YES)
  2395                              <1> 	;             DX > 0 : Ambiguous filename chars are used
  2396                              <1> 	;
  2397                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI will be changed)
  2398                              <1> 
  2399 00009471 66A3[468B0100]      <1> 	mov	[FindFile_AttributesMask], ax
  2400 00009477 BF[488B0100]        <1> 	mov	edi, FindFile_DirEntry ; TR-DOS Fullfilename formatted buffer
  2401 0000947C 31C0                <1> 	xor	eax, eax
  2402 0000947E B90B000000          <1> 	mov	ecx, 11
  2403 00009483 F3AB                <1> 	rep	stosd	; 44 bytes
  2404                              <1> 	;stosw		; +2 bytes 
  2405                              <1> 	    
  2406 00009485 BF[388B0100]        <1> 	mov	edi, FindFile_Name ; FFF structure, offset 66
  2407 0000948A 39FE                <1> 	cmp	esi, edi
  2408 0000948C 7408                <1> 	je	short loc_fff_mfn_ok
  2409 0000948E 89FA                <1> 	mov	edx, edi 
  2410                              <1> 	 ; move 13 bytes
  2411 00009490 A5                  <1> 	movsd
  2412 00009491 A5                  <1> 	movsd
  2413 00009492 A5                  <1> 	movsd
  2414 00009493 AA                  <1> 	stosb
  2415 00009494 89D6                <1> 	mov	esi, edx
  2416                              <1> loc_fff_mfn_ok:
  2417 00009496 BF[E78A0100]        <1> 	mov	edi, Dir_Entry_Name ; Dir Entry Format File Name
  2418 0000949B E8D7200000          <1> 	call	convert_file_name
  2419 000094A0 89FE                <1> 	mov	esi, edi ; offset Dir_Entry_Name
  2420                              <1> 
  2421 000094A2 66A1[468B0100]      <1> 	mov	ax, [FindFile_AttributesMask]
  2422                              <1> 	;xor	ecx, ecx
  2423 000094A8 30C9                <1> 	xor	cl, cl  
  2424 000094AA E8D11D0000          <1> 	call	locate_current_dir_file
  2425 000094AF 726E                <1> 	jc	short loc_fff_retn
  2426                              <1> 	; EDI = Directory Entry
  2427                              <1> 	; EBX = Directory Buffer Entry Index/Number
  2428                              <1> 
  2429                              <1> loc_fff_fnf_ln_check:
  2430 000094B1 30ED                <1> 	xor	ch, ch 
  2431 000094B3 80F60F              <1> 	xor	dh, 0Fh
  2432 000094B6 7408                <1> 	jz	short loc_fff_longname_yes
  2433 000094B8 882D[458B0100]      <1> 	mov	[FindFile_LongNameYes], ch ; 0
  2434 000094BE EB0C                <1> 	jmp	short loc_fff_longname_no
  2435                              <1> 
  2436                              <1> loc_fff_longname_yes:
  2437                              <1> 	;inc	byte [FindFile_LongNameYes]
  2438 000094C0 8A0D[528A0100]      <1> 	mov	cl, [LFN_EntryLength]  
  2439 000094C6 880D[458B0100]      <1> 	mov	[FindFile_LongNameEntryLength], cl ; FindFile_LongNameYes
  2440                              <1> 
  2441                              <1> loc_fff_longname_no:
  2442                              <1> 	;mov	bx, [DirBuff_CurrentEntry]
  2443 000094CC 66891D[708B0100]    <1> 	mov	[FindFile_DirEntryNumber], bx
  2444 000094D3 6689C2              <1> 	mov	dx, ax ; Ambiguous Filename chars used sign > 0
  2445                              <1> 
  2446 000094D6 A0[56820100]        <1> 	mov	al, [Current_Drv]
  2447 000094DB A2[F68A0100]        <1> 	mov	[FindFile_Drv], al 
  2448                              <1> 
  2449 000094E0 A1[50820100]        <1> 	mov	eax, [Current_Dir_FCluster]
  2450 000094E5 A3[688B0100]        <1> 	mov	[FindFile_DirFirstCluster], eax
  2451                              <1> 
  2452 000094EA A1[81890100]        <1> 	mov	eax, [DirBuff_Cluster]
  2453 000094EF A3[6C8B0100]        <1> 	mov	[FindFile_DirCluster], eax
  2454                              <1> 
  2455 000094F4 66FF05[728B0100]    <1> 	inc	word [FindFile_MatchCounter]
  2456                              <1> 
  2457 000094FB 89FB                <1> 	mov	ebx, edi
  2458 000094FD 89FE                <1> 	mov	esi, edi
  2459 000094FF BF[488B0100]        <1> 	mov	edi, FindFile_DirEntry
  2460 00009504 89F8                <1> 	mov	eax, edi
  2461 00009506 B108                <1> 	mov	cl, 8
  2462 00009508 F3A5                <1> 	rep	movsd
  2463 0000950A 89C6                <1> 	mov	esi, eax
  2464 0000950C 89DF                <1> 	mov	edi, ebx
  2465                              <1> 
  2466 0000950E A1[648B0100]        <1> 	mov	eax, [FindFile_DirEntry+28] ; File Size
  2467                              <1> 
  2468 00009513 8A1D[538B0100]      <1> 	mov	bl, [FindFile_DirEntry+11] ; File Attributes 
  2469 00009519 8A3D[458B0100]      <1> 	mov	bh, [FindFile_LongNameYes]
  2470                              <1> 
  2471                              <1> 	;mov	cx, [DirBuff_EntryCounter]
  2472                              <1> 	;mov	[FindFile_DirEntryNumber], cx
  2473                              <1> 	;mov	cx, [FindFile_DirEntryNumber]
  2474                              <1> 	; ecx = 0
  2475                              <1> 
  2476                              <1> loc_fff_retn:
  2477 0000951F C3                  <1> 	retn
  2478                              <1> 
  2479                              <1> find_next_file:
  2480                              <1> 	; 15/10/2016
  2481                              <1> 	; 10/02/2016
  2482                              <1> 	; 08/02/2016 (TRDOS 386 = TRDOS v2.0)
  2483                              <1> 	; 06/02/2011
  2484                              <1> 	; 17/09/2009
  2485                              <1> 	; 2005
  2486                              <1> 	; INPUT ->
  2487                              <1> 	;	NONE, Find First File Parameters
  2488                              <1> 	; OUTPUT ->
  2489                              <1> 	;	CF = 1 -> Error, Error Code in EAX (AL)
  2490                              <1> 	;	CF = 0 -> 
  2491                              <1> 	;	    ESI = Directory Entry (FindFile_DirEntry) Location
  2492                              <1> 	;	    EDI = Directory Buffer Directory Entry Location
  2493                              <1> 	;	    EAX = File Size
  2494                              <1> 	;	      BL = Attributes of The File/Directory
  2495                              <1> 	;	      BH = Long Name Yes/No Status (>0 is YES)
  2496                              <1> 	;             DX > 0 : Ambiguous filename chars are used 
  2497                              <1> 	;
  2498                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI will be changed)
  2499                              <1> 
  2500 00009520 66833D[728B0100]00  <1> 	cmp	word [FindFile_MatchCounter], 0
  2501 00009528 7707                <1> 	ja	short loc_start_search_next_file
  2502                              <1> 
  2503                              <1> loc_fnf_stc_retn:
  2504 0000952A F9                  <1> 	stc
  2505                              <1> loc_fnf_ax12h_retn:
  2506 0000952B B80C000000          <1> 	mov	eax, 12 ; No More files
  2507                              <1> ;loc_fnf_retn:
  2508 00009530 C3                  <1> 	retn
  2509                              <1> 
  2510                              <1> loc_start_search_next_file:
  2511 00009531 668B1D[708B0100]    <1> 	mov	bx, [FindFile_DirEntryNumber]
  2512 00009538 6643                <1> 	inc	bx
  2513 0000953A 663B1D[7F890100]    <1> 	cmp	bx, [DirBuff_LastEntry]
  2514 00009541 7719                <1> 	ja	short loc_cont_search_next_file
  2515                              <1> 
  2516                              <1> loc_fnf_search:
  2517 00009543 BE[E78A0100]        <1> 	mov	esi, Dir_Entry_Name
  2518 00009548 66A1[468B0100]      <1> 	mov	ax, [FindFile_AttributesMask]
  2519 0000954E 6631C9              <1> 	xor	cx, cx
  2520 00009551 E82E1E0000          <1> 	call	find_directory_entry
  2521 00009556 0F8355FFFFFF        <1>         jnc     loc_fff_fnf_ln_check
  2522                              <1> 
  2523                              <1> loc_cont_search_next_file:
  2524 0000955C 31DB                <1> 	xor	ebx, ebx
  2525 0000955E 8A3D[56820100]      <1> 	mov	bh, [Current_Drv]
  2526 00009564 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2527 00009569 01DE                <1> 	add	esi, ebx
  2528                              <1> 
  2529 0000956B 803D[54820100]00    <1> 	cmp	byte [Current_Dir_Level], 0
  2530 00009572 7608                <1> 	jna	short loc_fnf_check_FAT_type
  2531 00009574 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  2532 00009578 72B1                <1> 	jb	short loc_fnf_ax12h_retn
  2533 0000957A EB06                <1> 	jmp	short loc_fnf_check_next_cluster
  2534                              <1>  
  2535                              <1> loc_fnf_check_FAT_type:
  2536 0000957C 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3
  2537 00009580 72A9                <1> 	jb	short loc_fnf_ax12h_retn
  2538                              <1> 
  2539                              <1> loc_fnf_check_next_cluster:
  2540 00009582 A1[81890100]        <1> 	mov	eax, [DirBuff_Cluster]
  2541 00009587 E8CA370000          <1> 	call	get_next_cluster
  2542 0000958C 7306                <1> 	jnc	short loc_fnf_load_next_dir_cluster
  2543 0000958E 09C0                <1> 	or	eax, eax
  2544 00009590 7498                <1> 	jz	short loc_fnf_stc_retn
  2545                              <1> 	;mov	eax, 17 ;Drive not ready or read error
  2546 00009592 F5                  <1>  	cmc	;stc
  2547                              <1> loc_fnf_retn:
  2548 00009593 C3                  <1> 	retn
  2549                              <1> 
  2550                              <1> loc_fnf_load_next_dir_cluster:
  2551 00009594 E8A3390000          <1> 	call	load_FAT_sub_directory
  2552 00009599 72F8                <1> 	jc	short loc_fnf_retn
  2553 0000959B 6631DB              <1> 	xor	bx, bx
  2554 0000959E 66891D[708B0100]    <1> 	mov	[FindFile_DirEntryNumber], bx
  2555 000095A5 EB9C                <1> 	jmp	short loc_fnf_search
  2556                              <1> 
  2557                              <1> get_and_print_longname:
  2558                              <1> 	; 16/10/2016
  2559                              <1> 	; 13/02/2016 (TRDOS 386 = TRDOS v2.0)
  2560                              <1> 	; 24/01/2010
  2561                              <1> 	; 17/10/2009 (CMD_INTR.ASM, 'cmp_cmd_longname')
  2562                              <1> get_longname_fchar:
  2563 000095A7 803E20              <1> 	cmp	byte [esi], 20h
  2564 000095AA 7701                <1> 	ja	short loc_find_longname
  2565                              <1> 	;jb	short loc_longname_retn
  2566                              <1> 	;inc	esi
  2567                              <1> 	;je	short get_longname_fchar
  2568                              <1> ;loc_longname_retn:
  2569 000095AC C3                  <1> 	retn
  2570                              <1> loc_find_longname:
  2571 000095AD E839210000          <1> 	call	find_longname
  2572 000095B2 7328                <1> 	jnc	short loc_print_longname
  2573                              <1> 	
  2574 000095B4 08C0                <1> 	or	al, al
  2575 000095B6 741A                <1> 	jz	short loc_longname_not_found
  2576                              <1> 	  
  2577                              <1> 	; 16/10/2016 (15h -> 15, 17)
  2578 000095B8 3C0F                <1> 	cmp	al, 15
  2579 000095BA 0F84B6F7FFFF        <1> 	je	cd_drive_not_ready ; drive not ready
  2580                              <1> 				   ; or
  2581 000095C0 3C11                <1> 	cmp	al, 17		   ; read error	
  2582 000095C2 0F84AEF7FFFF        <1> 	je	cd_drive_not_ready 
  2583                              <1> 
  2584                              <1> loc_ln_file_dir_not_found:
  2585 000095C8 BE[4E3B0100]        <1> 	mov	esi, Msg_File_Directory_Not_Found
  2586                              <1> 	;call	print_msg	
  2587                              <1>         ;retn
  2588 000095CD E973DFFFFF          <1> 	jmp	print_msg
  2589                              <1> 
  2590                              <1> loc_longname_not_found:
  2591 000095D2 BE[6D3B0100]        <1>         mov     esi, Msg_LongName_Not_Found
  2592                              <1> 	;call	print_msg	
  2593                              <1>         ;retn
  2594 000095D7 E969DFFFFF          <1> 	jmp	print_msg
  2595                              <1> 
  2596                              <1> loc_print_longname:
  2597                              <1> 	;mov	esi, LongFileName
  2598 000095DC BF[56830100]        <1> 	mov	edi, TextBuffer
  2599 000095E1 57                  <1> 	push	edi 
  2600 000095E2 3C00                <1> 	cmp	al, 0
  2601 000095E4 7708                <1> 	ja	short loc_print_longname_1
  2602                              <1> loc_print_FS_longname: ; Singlix FS (64 byte ASCIIZ file name)
  2603 000095E6 AC                  <1> 	lodsb
  2604 000095E7 AA                  <1> 	stosb  
  2605 000095E8 08C0                <1> 	or	al, al
  2606 000095EA 75FA                <1> 	jnz	short loc_print_FS_longname
  2607 000095EC EB07                <1> 	jmp	short loc_print_longname_2
  2608                              <1> 	;
  2609                              <1> loc_print_longname_1: ; MS Windows long name (UNICODE chars)
  2610 000095EE 66AD                <1> 	lodsw
  2611 000095F0 AA                  <1> 	stosb  
  2612 000095F1 08C0                <1> 	or	al, al
  2613 000095F3 75F9                <1> 	jnz	short loc_print_longname_1
  2614                              <1> 	;
  2615                              <1> loc_print_longname_2:	
  2616 000095F5 5E                  <1> 	pop	esi
  2617 000095F6 E84ADFFFFF          <1> 	call	print_msg
  2618 000095FB BE[BF440100]        <1>   	mov	esi, nextline
  2619                              <1> 	;call	print_msg
  2620                              <1> 	;retn
  2621 00009600 E940DFFFFF          <1> 	jmp	print_msg	
  2622                              <1> 
  2623                              <1> show_file:
  2624                              <1> 	; 18/02/2016
  2625                              <1> 	; 17/02/2016
  2626                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  2627                              <1> 	; 13/09/2011 (CMD_INTR.ASM, 'cmp_cmd_show')
  2628                              <1> 	; 08/11/2009
  2629                              <1> 
  2630                              <1> loc_show_parse_path_name:
  2631 00009605 BF[F68A0100]        <1> 	mov	edi, FindFile_Drv
  2632 0000960A E833200000          <1> 	call	parse_path_name
  2633 0000960F 0F824CF9FFFF        <1> 	jc	loc_cmd_failed
  2634                              <1> 
  2635                              <1> loc_show_check_filename_exists:
  2636 00009615 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  2637 0000961A 803E20              <1> 	cmp	byte [esi], 20h
  2638 0000961D 0F863EF9FFFF        <1> 	jna	loc_cmd_failed
  2639                              <1> 
  2640                              <1> 	; 15/02/2016 (invalid file name check)
  2641 00009623 E807020000          <1> 	call	check_filename 	
  2642 00009628 730A                <1> 	jnc	short loc_show_change_drv
  2643                              <1> 
  2644 0000962A BE[3A3C0100]        <1> 	mov	esi, Msg_invalid_name_chars
  2645 0000962F E911DFFFFF          <1> 	jmp	print_msg
  2646                              <1>    
  2647                              <1> loc_show_change_drv:
  2648 00009634 8A35[56820100]      <1> 	mov	dh, [Current_Drv]
  2649 0000963A 8835[B2890100]      <1> 	mov	[RUN_CDRV], dh
  2650 00009640 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
  2651 00009646 38F2                <1> 	cmp	dl, dh
  2652 00009648 740B                <1> 	je	short loc_show_change_directory
  2653 0000964A E87FEAFFFF          <1> 	call	change_current_drive
  2654                              <1> 	;jc	loc_file_rw_cmd_failed
  2655 0000964F 0F8237F9FFFF        <1> 	jc	loc_run_cmd_failed
  2656                              <1> 
  2657                              <1> loc_show_change_directory:
  2658 00009655 803D[F78A0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  2659 0000965C 7618                <1> 	jna	short loc_findload_showfile
  2660                              <1> 
  2661 0000965E FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  2662 00009664 BE[F78A0100]        <1> 	mov	esi, FindFile_Directory
  2663 00009669 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2664 0000966B E8BC190000          <1> 	call	change_current_directory
  2665                              <1> 	;jc	loc_file_rw_cmd_failed
  2666 00009670 0F8216F9FFFF        <1> 	jc	loc_run_cmd_failed
  2667                              <1> 
  2668                              <1> ;loc_show_change_prompt_dir_string:
  2669                              <1> 	;call	change_prompt_dir_string
  2670                              <1> 
  2671                              <1> loc_findload_showfile:
  2672                              <1> 	; 15/02/2016
  2673 00009676 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  2674 0000967B BF[E78A0100]        <1> 	mov	edi, Dir_Entry_Name ; Dir Entry Format File Name
  2675 00009680 E8F21E0000          <1> 	call	convert_file_name
  2676 00009685 89FE                <1> 	mov	esi, edi ; offset Dir_Entry_Name
  2677                              <1> 
  2678 00009687 28C0                <1> 	sub	al, al	; Attrib AND mask = 0
  2679                              <1> 	; Directory attribute : 10h
  2680                              <1> 	; Volume name attribute: 8h
  2681 00009689 B418                <1> 	mov	ah, 00011000b ; 18h (Attrib NAND, AND --> zero mask)
  2682                              <1> 	;
  2683 0000968B 6631C9              <1> 	xor	cx, cx  
  2684 0000968E E8ED1B0000          <1> 	call	locate_current_dir_file
  2685                              <1> 	;jc	loc_file_rw_cmd_failed
  2686 00009693 0F82F3F8FFFF        <1> 	jc	loc_run_cmd_failed
  2687                              <1> 
  2688                              <1> loc_show_load_file:
  2689                              <1> 	; EDI = Directory Entry
  2690 00009699 668B4714            <1> 	mov	ax, [edi+DirEntry_FstClusHI] ; First Cluster High Word
  2691 0000969D C1E010              <1> 	shl	eax, 16
  2692 000096A0 668B471A            <1> 	mov	ax, [edi+DirEntry_FstClusLO] ; First Cluster Low Word
  2693 000096A4 A3[A08B0100]        <1> 	mov	[Show_Cluster], eax
  2694 000096A9 8B471C              <1> 	mov	eax, [edi+DirEntry_FileSize] ; File Size
  2695 000096AC 21C0                <1> 	and	eax, eax ; Empty file !
  2696 000096AE 0F8491000000        <1>         jz      end_of_show_file 
  2697 000096B4 A3[A48B0100]        <1> 	mov	[Show_FileSize], eax
  2698 000096B9 31C0                <1> 	xor	eax, eax
  2699 000096BB A3[A88B0100]        <1> 	mov	[Show_FilePointer], eax ; 0
  2700 000096C0 66A3[AC8B0100]      <1> 	mov	[Show_ClusterPointer], ax ; 0
  2701 000096C6 29DB                <1> 	sub	ebx, ebx
  2702 000096C8 8A3D[56820100]      <1> 	mov	bh, [Current_Drv]
  2703 000096CE BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2704 000096D3 01DE                <1> 	add	esi, ebx
  2705 000096D5 8935[9C8B0100]      <1> 	mov	[Show_LDDDT], esi ; Logical DOS Drv Description Table addr
  2706                              <1> 
  2707 000096DB 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0	
  2708 000096DF 7713                <1> 	ja	short loc_show_calculate_cluster_size
  2709                              <1> 	; Singlix FS
  2710                              <1> 	; First Cluster Number is FDT number (in compatibility buffer)
  2711 000096E1 8B15[A08B0100]      <1> 	mov	edx, [Show_Cluster] ; Compatibility dir. buffer value (FDT)	
  2712 000096E7 8915[988B0100]      <1> 	mov	[Show_FDT], edx
  2713 000096ED 31C0                <1> 	xor	eax, eax
  2714 000096EF A3[A08B0100]        <1> 	mov	[Show_Cluster], eax ; Sector index  = 0
  2715                              <1> 				    ; (next time it will be 1)			
  2716                              <1> loc_show_calculate_cluster_size:
  2717 000096F4 668B5E11            <1> 	mov	bx, [esi+LD_BPB+BPB_BytsPerSec] ; FAT 12-16-32 (512)
  2718                              <1> 	; BX = 512 = [esi+LD_FS_BytesPerSec] ; Singlix FS	
  2719 000096F8 8A4613              <1> 	mov	al, [esi+LD_BPB+BPB_SecPerClust] ; FAT 12-16-32 (<= 128)
  2720                              <1> 	; AL = 1 = [esi+LD_FS_Reserved2] ; SectPerClust for Singlix FS
  2721 000096FB F7E3                <1> 	mul	ebx	
  2722                              <1> 
  2723                              <1> 	;cmp	eax, 65536 ; non-compatible (very big) cluster size
  2724                              <1> 	;ja	short end_of_show_file	
  2725 000096FD 66A3[AE8B0100]      <1> 	mov	[Show_ClusterSize], ax
  2726                              <1> 
  2727                              <1> loc_start_show_file:
  2728 00009703 BE[BF440100]        <1> 	mov	esi, nextline
  2729 00009708 E838DEFFFF          <1> 	call	print_msg
  2730                              <1> 
  2731 0000970D A1[A08B0100]        <1> 	mov	eax, [Show_Cluster]
  2732 00009712 C605[B08B0100]17    <1> 	mov	byte [Show_RowCount], 23
  2733                              <1> 
  2734                              <1> 	; 17/02/2016
  2735 00009719 8B35[9C8B0100]      <1> 	mov	esi, [Show_LDDDT]
  2736                              <1> 
  2737                              <1> loc_show_next_cluster:
  2738                              <1> 	; 15/02/2016
  2739 0000971F BB00000700          <1> 	mov	ebx, Cluster_Buffer ; 70000h (for current TRDOS 386 version)
  2740                              <1> 	; ESI = Logical DOS drv description table address
  2741 00009724 E851380000          <1> 	call	read_cluster
  2742                              <1> 	;jc	loc_file_rw_cmd_failed
  2743 00009729 0F825DF8FFFF        <1> 	jc	loc_run_cmd_failed
  2744                              <1> 
  2745 0000972F 31DB                <1> 	xor 	ebx, ebx
  2746                              <1> loc_show_next_byte:
  2747 00009731 803D[B08B0100]00    <1> 	cmp	byte [Show_RowCount], 0
  2748 00009738 7521                <1> 	jne	short pass_show_wait_for_key
  2749 0000973A 30E4                <1> 	xor	ah, ah
  2750 0000973C E8A477FFFF          <1> 	call	int16h
  2751 00009741 3C1B                <1> 	cmp	al, 1Bh
  2752 00009743 750F                <1> 	jne	short pass_exit_show
  2753                              <1> end_of_show_file:
  2754                              <1> pass_show_file:
  2755 00009745 BE[BF440100]        <1> 	mov	esi, nextline
  2756 0000974A E8F6DDFFFF          <1> 	call	print_msg
  2757 0000974F E94B010000          <1> 	jmp	loc_file_rw_restore_retn
  2758                              <1> 
  2759                              <1> pass_exit_show:
  2760 00009754 C605[B08B0100]14    <1> 	mov	byte [Show_RowCount], 20
  2761                              <1> pass_show_wait_for_key:
  2762 0000975B 81C300000700        <1> 	add	ebx, Cluster_Buffer
  2763 00009761 8A03                <1> 	mov	al, [ebx]
  2764 00009763 3C0D                <1> 	cmp	al, 0Dh
  2765 00009765 0F8590000000        <1>         jne     loc_show_check_tab_space
  2766 0000976B FE0D[B08B0100]      <1> 	dec	byte [Show_RowCount]
  2767                              <1> pass_show_dec_rowcount:
  2768 00009771 B307                <1> 	mov	bl, 7 ; (light gray character color, black background)
  2769 00009773 8A3D[BE810100]      <1> 	mov	bh, [ACTIVE_PAGE] ; [ptty]
  2770 00009779 E87F8BFFFF          <1> 	call	_write_tty
  2771                              <1> loc_show_check_eof:
  2772 0000977E FF05[A88B0100]      <1> 	inc	dword [Show_FilePointer]
  2773 00009784 A1[A88B0100]        <1> 	mov	eax, [Show_FilePointer]
  2774 00009789 3B05[A48B0100]      <1> 	cmp	eax, [Show_FileSize]
  2775 0000978F 73B4                <1> 	jnb	short end_of_show_file
  2776 00009791 66FF05[AC8B0100]    <1> 	inc	word [Show_ClusterPointer]
  2777 00009798 0FB71D[AC8B0100]    <1> 	movzx	ebx, word [Show_ClusterPointer]
  2778                              <1> 
  2779                              <1> 	; 17/02/2016
  2780                              <1> 	; (sector boundary -9 bits- check, 512 = 0)
  2781 0000979F 66F7C3FF01          <1>         test    bx, 1FFh ;  1 to 511
  2782 000097A4 758B                <1> 	jnz	short loc_show_next_byte
  2783                              <1> 
  2784                              <1> 	; 16/02/2016
  2785 000097A6 8B35[9C8B0100]      <1> 	mov	esi, [Show_LDDDT]
  2786                              <1> 	;
  2787 000097AC 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2788 000097B0 7719                <1> 	ja	short loc_show_check_fat_cluster_size
  2789                              <1> 
  2790                              <1> 	; Singlix FS
  2791                              <1> 	; 1 sector, more... (cluster size = 1 sector)
  2792 000097B2 A1[A08B0100]        <1> 	mov	eax, [Show_Cluster]
  2793 000097B7 40                  <1> 	inc	eax
  2794 000097B8 A3[A08B0100]        <1> 	mov	[Show_Cluster], eax
  2795                              <1> 
  2796 000097BD 6621DB              <1> 	and	bx, bx ; 65536 -> 0
  2797 000097C0 0F856BFFFFFF        <1>         jnz	loc_show_next_byte
  2798 000097C6 E954FFFFFF          <1> 	jmp     loc_show_next_cluster
  2799                              <1> 	 
  2800                              <1> loc_show_check_fat_cluster_size:
  2801                              <1> 	; 17/02/2016
  2802 000097CB 663B1D[AE8B0100]    <1> 	cmp	bx, [Show_ClusterSize] ; cluster size in bytes
  2803 000097D2 0F8259FFFFFF        <1>         jb	loc_show_next_byte
  2804 000097D8 66C705[AC8B0100]00- <1> 	mov	word [Show_ClusterPointer], 0
  2804 000097E0 00                  <1>
  2805                              <1> 
  2806 000097E1 A1[A08B0100]        <1> 	mov	eax, [Show_Cluster]
  2807                              <1> 	;mov	esi, [Show_LDDDT]
  2808                              <1> loc_show_get_next_cluster:
  2809 000097E6 E86B350000          <1> 	call	get_next_cluster
  2810                              <1> 	;jc	loc_file_rw_cmd_failed
  2811 000097EB 0F829BF7FFFF        <1> 	jc	loc_run_cmd_failed
  2812                              <1> loc_show_update_ccluster:
  2813 000097F1 A3[A08B0100]        <1> 	mov	[Show_Cluster], eax			
  2814 000097F6 E924FFFFFF          <1>         jmp     loc_show_next_cluster
  2815                              <1> 
  2816                              <1> loc_show_check_tab_space:
  2817 000097FB 3C09                <1> 	cmp	al, 09h
  2818 000097FD 0F856EFFFFFF        <1>         jne     pass_show_dec_rowcount
  2819                              <1> loc_show_put_tab_space:
  2820 00009803 8A3D[BE810100]      <1> 	mov	bh, [ACTIVE_PAGE] ; [ptty]
  2821 00009809 E86B87FFFF          <1> 	call	get_cpos
  2822                              <1> 	; dl = cursor column
  2823 0000980E 80E207              <1> 	and	dl, 7 ; 18/02/2016
  2824                              <1> 	;shr	bh, 1 ; [ACTIVE_PAGE]
  2825 00009811 8A3D[BE810100]      <1> 	mov	bh, [ACTIVE_PAGE]
  2826 00009817 B307                <1> 	mov	bl, 7 ; color attribute
  2827                              <1> loc_show_put_space_chars:
  2828 00009819 B020                <1> 	mov	al, 20h ; space
  2829                              <1> 	;mov	bh, [ACTIVE_PAGE] ; [ptty]
  2830                              <1> 	;mov	bl, 7 ; color attribute
  2831                              <1> 	;push	dx
  2832 0000981B 52                  <1> 	push	edx ; 29/12/2017
  2833 0000981C E8DC8AFFFF          <1> 	call	_write_tty
  2834 00009821 5A                  <1> 	pop	edx ; 29/12/2017
  2835                              <1> 	;pop	dx
  2836                              <1> 	; 18/02/2016
  2837 00009822 80FA07              <1> 	cmp	dl, 7
  2838 00009825 0F8353FFFFFF        <1> 	jnb	loc_show_check_eof
  2839 0000982B FEC2                <1> 	inc	dl
  2840 0000982D EBEA                <1> 	jmp	short loc_show_put_space_chars
  2841                              <1> 
  2842                              <1> check_filename:
  2843                              <1> 	; 10/10/2016
  2844                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  2845                              <1> 	; 07/08/2010 (FILE.ASM, 'proc_check_filename')
  2846                              <1> 	; 10/07/2010
  2847                              <1> 	; Derived from 'proc_check_filename'
  2848                              <1> 	; in the old TRDOS.ASM (09/02/2005).
  2849                              <1> 	;
  2850                              <1> 	; INPUT -> 
  2851                              <1> 	;	ESI = Dot File Name Location
  2852                              <1> 	; OUTPUT ->
  2853                              <1> 	;	cf = 1 -> error code in AL
  2854                              <1> 	;	     AL = ERR_INV_FILE_NAME (=26)
  2855                              <1> 	;		  Invalid file name chars   
  2856                              <1> 	;	cf = 0 -> valid file name
  2857                              <1> 	; 
  2858                              <1> 	;(EAX, ECX, EDI will be changed)
  2859                              <1> 
  2860                              <1> check_invalid_filename_chars:
  2861                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  2862                              <1> 	; 10/07/2010 (FILE.ASM, 'proc_check_invalid_filename_chars')
  2863                              <1> 	; 10/02/2010
  2864                              <1> 	; Derived from 'proc_check_invalid_filename_chars'
  2865                              <1> 	; in the old TRDOS.ASM (09/02/2005).
  2866                              <1> 	;
  2867                              <1> 	; INPUT -> 
  2868                              <1> 	;	ESI = ASCIIZ FileName
  2869                              <1> 	; OUTPUT ->
  2870                              <1> 	;	cf = 1 -> invalid
  2871                              <1> 	;	cf = 0 -> valid
  2872                              <1> 	; 
  2873                              <1> 	;(EAX, ECX, EDI will be changed)
  2874                              <1>   
  2875 0000982F 56                  <1> 	push	esi
  2876                              <1> 
  2877 00009830 BF[22390100]        <1>         mov     edi, invalid_fname_chars
  2878 00009835 AC                  <1> 	lodsb
  2879                              <1> check_filename_next_char:
  2880 00009836 B914000000          <1> 	mov	ecx, sizeInvFnChars
  2881 0000983B BF[22390100]        <1> 	mov	edi, invalid_fname_chars
  2882                              <1> loc_scan_invalid_filename_char:
  2883 00009840 AE                  <1> 	scasb 
  2884 00009841 741F                <1> 	je	short loc_invalid_filename_stc 
  2885 00009843 E2FB                <1> 	loop	loc_scan_invalid_filename_char
  2886 00009845 AC                  <1> 	lodsb
  2887 00009846 3C1F                <1> 	cmp	al, 1Fh  ; 20h and above 
  2888 00009848 77EC                <1> 	ja	short check_filename_next_char
  2889                              <1> 
  2890                              <1> check_filename_dot:
  2891 0000984A 8B3424              <1> 	mov	esi, [esp]
  2892                              <1> 
  2893 0000984D B421                <1> 	mov	ah, 21h
  2894 0000984F B908000000          <1> 	mov	ecx, 8
  2895                              <1> loc_check_filename_next_char:
  2896 00009854 AC                  <1> 	lodsb
  2897 00009855 3C2E                <1> 	cmp	al, 2Eh
  2898 00009857 7511                <1> 	jne	short pass_check_fn_dot_check
  2899                              <1> loc_check_filename_ext_0:
  2900 00009859 AC                  <1> 	lodsb
  2901 0000985A 38E0                <1> 	cmp	al, ah ; 21h
  2902 0000985C 7205                <1> 	jb	short loc_invalid_filename
  2903 0000985E 3C2E                <1> 	cmp	al, 2Eh
  2904 00009860 7519                <1> 	jne	short loc_check_filename_ext_1
  2905                              <1> 
  2906                              <1> loc_invalid_filename_stc:
  2907                              <1> loc_check_fn_stc_rtn:
  2908 00009862 F9                  <1> 	stc
  2909                              <1> loc_invalid_filename:
  2910                              <1> 	; 10/10/2016 (0Bh -> 26)
  2911 00009863 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME ; (=26)
  2912                              <1> 	; Invalid file name chars
  2913                              <1> loc_check_fn_rtn:
  2914 00009868 5E                  <1> 	pop	esi
  2915 00009869 C3                  <1> 	retn
  2916                              <1> 
  2917                              <1> pass_check_fn_dot_check:
  2918 0000986A 38E0                <1> 	cmp	al, ah ; 21h
  2919 0000986C 7224                <1> 	jb	short loc_check_fn_clc_rtn
  2920 0000986E E2E4                <1> 	loop	loc_check_filename_next_char
  2921 00009870 AC                  <1> 	lodsb
  2922 00009871 38E0                <1> 	cmp	al, ah ; 21h
  2923 00009873 721D                <1> 	jb	short loc_check_fn_clc_rtn
  2924 00009875 3C2E                <1> 	cmp	al, 2Eh
  2925 00009877 75E9                <1> 	jne	short loc_check_fn_stc_rtn
  2926 00009879 EBDE                <1> 	jmp	short loc_check_filename_ext_0
  2927                              <1> 
  2928                              <1> loc_check_filename_ext_1:
  2929 0000987B AC                  <1> 	lodsb
  2930 0000987C 38E0                <1> 	cmp	al, ah ; 21h
  2931 0000987E 7212                <1> 	jb	short loc_check_fn_clc_rtn
  2932 00009880 3C2E                <1> 	cmp	al, 2Eh
  2933 00009882 74DE                <1> 	je	short loc_check_fn_stc_rtn
  2934 00009884 AC                  <1> 	lodsb
  2935 00009885 38E0                <1> 	cmp	al, ah ; 21h
  2936 00009887 7209                <1> 	jb	short loc_check_fn_clc_rtn
  2937 00009889 3C2E                <1> 	cmp	al, 2Eh
  2938 0000988B 74D5                <1> 	je	short loc_check_fn_stc_rtn
  2939 0000988D AC                  <1> 	lodsb
  2940 0000988E 38E0                <1> 	cmp	al, ah ; 21h
  2941 00009890 73D0                <1> 	jnb	short loc_check_fn_stc_rtn
  2942                              <1> 
  2943                              <1> loc_check_fn_clc_rtn:
  2944 00009892 5E                  <1> 	pop	esi
  2945 00009893 F8                  <1> 	clc
  2946 00009894 C3                  <1> 	retn
  2947                              <1> 
  2948                              <1> loc_print_deleted_message:
  2949 00009895 BE[0F3D0100]        <1> 	mov	esi, Msg_Deleted
  2950 0000989A E8A6DCFFFF          <1> 	call	print_msg
  2951                              <1> 
  2952                              <1> 	;clc
  2953                              <1> 
  2954                              <1> loc_file_rw_restore_retn:
  2955                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  2956                              <1> 	; 28/02/2010 (CMD_INTR.ASM)
  2957                              <1> loc_file_rw_cmd_failed:
  2958 0000989F 9C                  <1> 	pushf 
  2959 000098A0 E84FF7FFFF          <1> 	call	restore_cdir_after_cmd_fail	
  2960 000098A5 9D                  <1> 	popf
  2961 000098A6 720D                <1> 	jc	short loc_file_rw_check_write_fault
  2962 000098A8 C3                  <1> 	retn
  2963                              <1> 
  2964                              <1> loc_permission_denied:
  2965                              <1> 	; 27/02/2016
  2966 000098A9 BE[1C3D0100]        <1> 	mov	esi, Msg_Permission_Denied
  2967 000098AE E892DCFFFF          <1> 	call	print_msg
  2968 000098B3 EBEA                <1> 	jmp	short loc_file_rw_restore_retn
  2969                              <1> 
  2970                              <1> loc_file_rw_check_write_fault:
  2971                              <1> 	;cmp	al, 1Dh ; Write Fault
  2972 000098B5 3C12                <1>         cmp	al, 18 ; 05/11/2016
  2973 000098B7 0F85D4F6FFFF        <1> 	jne     loc_run_cmd_failed_cmp_al
  2974 000098BD BE[033B0100]        <1> 	mov	esi, Msg_Not_Ready_Write_Err
  2975                              <1> 	;call	print_msg
  2976                              <1> 	;retn
  2977 000098C2 E97EDCFFFF          <1> 	jmp	print_msg
  2978                              <1> 
  2979                              <1> make_directory:
  2980                              <1> 	; 21/02/2016 (TRDOS 386 = TRDOS v2.0)
  2981                              <1> 	; 12/03/2011 (CMD_INTR.ASM, 'cmp_cmd_mkdir')
  2982                              <1> 	; 14/08/2010
  2983                              <1> 	; 10/07/2010
  2984                              <1> 	; 29/11/2009
  2985                              <1> 	;
  2986                              <1> get_mkdir_fchar:
  2987                              <1> 	; esi = directory name
  2988 000098C7 803E20              <1> 	cmp	byte [esi], 20h
  2989 000098CA 7701                <1>         ja	short loc_mkdir_parse_path_name
  2990                              <1> 
  2991                              <1> loc_mkdir_nodirname_retn:
  2992 000098CC C3                  <1> 	retn
  2993                              <1> 
  2994                              <1> loc_mkdir_parse_path_name:
  2995 000098CD BF[F68A0100]        <1> 	mov	edi, FindFile_Drv
  2996 000098D2 E86B1D0000          <1>         call    parse_path_name
  2997 000098D7 0F8284F6FFFF        <1> 	jc	loc_cmd_failed
  2998                              <1> 
  2999                              <1> loc_mkdir_check_dirname_exists:
  3000 000098DD BE[388B0100]        <1> 	mov	esi, FindFile_Name
  3001 000098E2 803E20              <1> 	cmp	byte [esi], 20h
  3002 000098E5 0F8676F6FFFF        <1> 	jna	loc_cmd_failed
  3003 000098EB 8935[B48B0100]      <1> 	mov	[DelFile_FNPointer], esi
  3004 000098F1 E839FFFFFF          <1> 	call	check_filename
  3005 000098F6 7259                <1> 	jc	short loc_mkdir_invalid_dir_name_chars
  3006                              <1> 
  3007                              <1> loc_mkdir_drv:
  3008 000098F8 8A35[56820100]      <1> 	mov	dh, [Current_Drv]
  3009 000098FE 8835[B2890100]      <1> 	mov	[RUN_CDRV], dh
  3010                              <1> 	
  3011 00009904 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
  3012 0000990A 38F2                <1> 	cmp	dl, dh
  3013 0000990C 7407                <1> 	je	short loc_mkdir_change_directory
  3014                              <1> 
  3015 0000990E E8BBE7FFFF          <1> 	call	change_current_drive
  3016 00009913 728A                <1> 	jc	loc_file_rw_cmd_failed
  3017                              <1> 
  3018                              <1> loc_mkdir_change_directory:
  3019 00009915 803D[F78A0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3020 0000991C 7614                <1> 	jna	short loc_mkdir_find_directory
  3021                              <1> 
  3022 0000991E FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  3023 00009924 BE[F78A0100]        <1> 	mov	esi, FindFile_Directory
  3024 00009929 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3025 0000992B E8FC160000          <1> 	call	change_current_directory
  3026 00009930 722E                <1> 	jc	short loc_mkdir_check_error_code
  3027                              <1> 
  3028                              <1> ;loc_mkdir_change_prompt_dir_string:
  3029                              <1> 	;call	change_prompt_dir_string
  3030                              <1> 
  3031                              <1> loc_mkdir_find_directory:
  3032                              <1> 	;mov	esi, FindFile_Name
  3033 00009932 8B35[B48B0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3034                              <1> 	;xor	eax, eax
  3035 00009938 6631C0              <1> 	xor	ax, ax ; any name (dir, file, volume)
  3036 0000993B E831FBFFFF          <1> 	call	find_first_file
  3037 00009940 721E                <1> 	jc	short loc_mkdir_check_error_code
  3038                              <1> 
  3039                              <1> loc_mkdir_directory_found:
  3040 00009942 BE[673C0100]        <1> 	mov	esi, Msg_Name_Exists
  3041 00009947 E8F9DBFFFF          <1> 	call	print_msg
  3042                              <1> 
  3043 0000994C E94EFFFFFF          <1>         jmp     loc_file_rw_restore_retn
  3044                              <1> 
  3045                              <1> loc_mkdir_invalid_dir_name_chars:
  3046 00009951 BE[3A3C0100]        <1> 	mov	esi, Msg_invalid_name_chars
  3047 00009956 E8EADBFFFF          <1> 	call	print_msg
  3048                              <1> 
  3049 0000995B E93FFFFFFF          <1>         jmp     loc_file_rw_restore_retn
  3050                              <1> 
  3051                              <1> loc_mkdir_check_error_code:
  3052 00009960 3C02                <1> 	cmp	al, 2
  3053                              <1> 	;je	short loc_mkdir_directory_not_found
  3054 00009962 7406                <1> 	je	short loc_mkdir_ask_for_yes_no
  3055 00009964 F9                  <1> 	stc
  3056 00009965 E935FFFFFF          <1>         jmp     loc_file_rw_cmd_failed
  3057                              <1> 
  3058                              <1> loc_mkdir_directory_not_found:
  3059                              <1> loc_mkdir_ask_for_yes_no:
  3060 0000996A BE[883C0100]        <1> 	mov	esi, Msg_DoYouWantMkdir
  3061 0000996F E8D1DBFFFF          <1> 	call	print_msg
  3062 00009974 8B35[B48B0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3063 0000997A E8C6DBFFFF          <1> 	call	print_msg
  3064 0000997F BE[A73C0100]        <1> 	mov	esi, Msg_YesNo
  3065 00009984 E8BCDBFFFF          <1> 	call	print_msg
  3066                              <1> 
  3067 00009989 C605[B13C0100]20    <1> 	mov	byte [Y_N_nextline], 20h
  3068                              <1> 
  3069                              <1> loc_mkdir_ask_again:
  3070 00009990 30E4                <1> 	xor	ah, ah
  3071 00009992 E84E75FFFF          <1> 	call	int16h
  3072 00009997 3C1B                <1> 	cmp	al, 1Bh
  3073                              <1> 	;je	short loc_do_not_make_directory
  3074 00009999 7439                <1> 	je	short loc_mkdir_y_n_escape
  3075 0000999B 24DF                <1> 	and	al, 0DFh ; y -> Y, n -> N
  3076 0000999D 3C59                <1> 	cmp	al, 'Y' ; 'yes'
  3077 0000999F 7404                <1> 	je	short loc_mkdir_yes_make_directory
  3078 000099A1 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3079 000099A3 75EB                <1> 	jne	short loc_mkdir_ask_again
  3080                              <1> 
  3081                              <1> loc_do_not_make_directory:
  3082                              <1> loc_mkdir_yes_make_directory:
  3083 000099A5 E82E000000          <1> 	call	y_n_answer ; 29/12/2017
  3084                              <1> 	;cmp	al, 'Y' ; 'yes'
  3085                              <1> 	;cmc
  3086                              <1>         ;jnc	loc_file_rw_restore_retn
  3087 000099AA 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3088 000099AC 0F84EDFEFFFF        <1>         je	loc_file_rw_restore_retn  
  3089                              <1> 
  3090                              <1> loc_mkdir_call_make_sub_directory:
  3091 000099B2 8B35[B48B0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3092 000099B8 B110                <1> 	mov	cl, 10h ; Directory attributes 
  3093 000099BA E8821D0000          <1> 	call	make_sub_directory
  3094                              <1> loc_rename_file_ok: ; 06/03/2016
  3095 000099BF 0F82DAFEFFFF        <1>         jc	loc_file_rw_cmd_failed
  3096                              <1> move_source_file_to_destination_OK:
  3097 000099C5 BE[B53C0100]        <1> 	mov	esi, Msg_OK
  3098 000099CA E876DBFFFF          <1> 	call	print_msg
  3099 000099CF E9CBFEFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3100                              <1> 
  3101                              <1> loc_mkdir_y_n_escape:
  3102 000099D4 B04E                <1> 	mov	al, 'N' ; 'no'
  3103 000099D6 EBCD                <1> 	jmp	short loc_do_not_make_directory
  3104                              <1> 
  3105                              <1> y_n_answer:
  3106                              <1> 	; 29/12/2017
  3107 000099D8 A2[B13C0100]        <1> 	mov	[Y_N_nextline], al
  3108                              <1> 	;push	ax
  3109 000099DD 50                  <1> 	push	eax
  3110 000099DE BE[B13C0100]        <1> 	mov	esi, Y_N_nextline
  3111 000099E3 E85DDBFFFF          <1> 	call	print_msg
  3112 000099E8 58                  <1> 	pop	eax
  3113                              <1> 	;pop	ax
  3114 000099E9 C3                  <1> 	retn
  3115                              <1> 
  3116                              <1> delete_directory:
  3117                              <1> 	; 29/12/2017
  3118                              <1> 	; 15/10/2016
  3119                              <1> 	; 01/03/2016, 06/03/2016
  3120                              <1> 	; 27/02/2016, 28/02/2016, 29/02/2016
  3121                              <1> 	; 26/02/2016 (TRDOS 386 = TRDOS v2.0)
  3122                              <1> 	; 16/10/2010 (CMD_INTR.ASM, 'cmp_cmd_rmdir')
  3123                              <1> 	; 05/06/2010
  3124                              <1> 	;
  3125                              <1> get_fchar:
  3126                              <1> 	; esi = directory name
  3127 000099EA 803E20              <1> 	cmp	byte [esi], 20h
  3128 000099ED 7701                <1>         ja	short loc_rmdir_parse_path_name
  3129                              <1> 
  3130                              <1> loc_rmdir_nodirname_retn:
  3131 000099EF C3                  <1> 	retn
  3132                              <1> 
  3133                              <1> loc_rmdir_parse_path_name:
  3134 000099F0 BF[F68A0100]        <1> 	mov	edi, FindFile_Drv
  3135 000099F5 E8481C0000          <1> 	call	parse_path_name
  3136 000099FA 0F8261F5FFFF        <1> 	jc	loc_cmd_failed
  3137                              <1> 
  3138                              <1> loc_rmdir_check_dirname_exists:
  3139 00009A00 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  3140 00009A05 803E20              <1> 	cmp	byte [esi], 20h
  3141 00009A08 0F8653F5FFFF        <1> 	jna	loc_cmd_failed
  3142 00009A0E 8935[B48B0100]      <1> 	mov	[DelFile_FNPointer], esi 
  3143                              <1> 
  3144                              <1> loc_rmdir_drv:
  3145 00009A14 8A35[56820100]      <1> 	mov	dh, [Current_Drv]
  3146 00009A1A 8835[B2890100]      <1> 	mov	[RUN_CDRV], dh
  3147                              <1> 
  3148 00009A20 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
  3149 00009A26 38F2                <1> 	cmp	dl, dh
  3150 00009A28 740B                <1> 	je	short loc_rmdir_change_directory
  3151                              <1> 
  3152 00009A2A E89FE6FFFF          <1> 	call	change_current_drive
  3153 00009A2F 0F826AFEFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3154                              <1> 
  3155                              <1> loc_rmdir_change_directory:
  3156 00009A35 803D[F78A0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3157 00009A3C 7614                <1> 	jna	short loc_rmdir_find_directory
  3158                              <1> 
  3159 00009A3E FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  3160 00009A44 BE[F78A0100]        <1> 	mov	esi, FindFile_Directory
  3161 00009A49 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3162 00009A4B E8DC150000          <1> 	call	change_current_directory
  3163 00009A50 7211                <1> 	jc	short loc_rmdir_check_error_code
  3164                              <1> 
  3165                              <1> ;loc_rmdir_change_prompt_dir_string:
  3166                              <1> 	;call	change_prompt_dir_string
  3167                              <1> 
  3168                              <1> loc_rmdir_find_directory:
  3169                              <1> 	;mov	esi, FindFile_Name
  3170 00009A52 8B35[B48B0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3171 00009A58 66B81008            <1> 	mov	ax, 0810h ; Only directories
  3172 00009A5C E810FAFFFF          <1> 	call	find_first_file
  3173 00009A61 730A                <1> 	jnc	short loc_rmdir_ambgfn_check
  3174                              <1> 
  3175                              <1> loc_rmdir_check_error_code:
  3176 00009A63 3C02                <1> 	cmp	al, 2
  3177 00009A65 740B                <1> 	je	short loc_rmdir_directory_not_found
  3178 00009A67 F9                  <1> 	stc
  3179 00009A68 E932FEFFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3180                              <1> 
  3181                              <1> loc_rmdir_ambgfn_check:
  3182 00009A6D 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3183 00009A70 740F                <1> 	jz	short loc_rmdir_directory_found
  3184                              <1> 
  3185                              <1> loc_rmdir_directory_not_found:
  3186 00009A72 BE[253B0100]        <1> 	mov	esi, Msg_Dir_Not_Found
  3187 00009A77 E8C9DAFFFF          <1> 	call	print_msg
  3188                              <1> 
  3189 00009A7C E91EFEFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3190                              <1> 
  3191                              <1> loc_rmdir_directory_found:
  3192 00009A81 80E307              <1> 	and	bl, 07h ; Attributes
  3193 00009A84 0F851FFEFFFF        <1> 	jnz	loc_permission_denied
  3194                              <1> 
  3195                              <1> loc_rmdir_save_lnel: ; 28/02/2016
  3196                              <1>        ;mov	bh, [LongName_EntryLength]
  3197 00009A8A 883D[BE8B0100]      <1> 	mov	[DelFile_LNEL], bh ; Long name entry length (if > 0)
  3198                              <1> 	; edi = Directory Entry Offset (DirBuff)
  3199                              <1> 	; esi = Directory Entry (FFF Structure)
  3200                              <1> 	;mov	[DelFile_DirEntryAddr], edi ; not required
  3201                              <1> 	;mov	ax, [edi+20] ; First Cluster High Word
  3202                              <1>         ;shl	eax, 16
  3203                              <1> 	;mov	ax, [edi+26] ; First Cluster Low Word
  3204                              <1> 	; ROOT Dir First Cluster = 0
  3205                              <1>         ;cmp	eax, 2
  3206                              <1> 	;jb	loc_update_direntry_1
  3207                              <1> 
  3208                              <1> pass_rmdir_fc_check:
  3209 00009A90 57                  <1> 	push	edi ; * (29/02/2016)
  3210                              <1> 
  3211 00009A91 BE[BB3C0100]        <1> 	mov	esi, Msg_DoYouWantRmDir
  3212 00009A96 E8AADAFFFF          <1> 	call	print_msg
  3213 00009A9B 8B35[B48B0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3214 00009AA1 E89FDAFFFF          <1> 	call	print_msg
  3215 00009AA6 BE[A73C0100]        <1> 	mov	esi, Msg_YesNo
  3216 00009AAB E895DAFFFF          <1> 	call	print_msg
  3217                              <1> 
  3218                              <1> loc_rmdir_ask_again:
  3219 00009AB0 30E4                <1> 	xor	ah, ah
  3220 00009AB2 E82E74FFFF          <1> 	call	int16h
  3221 00009AB7 3C1B                <1> 	cmp	al, 1Bh
  3222                              <1> 	;je	short loc_do_not_delete_directory
  3223 00009AB9 7433                <1>         je      loc_rmdir_y_n_escape ; 06/03/2016
  3224 00009ABB 24DF                <1> 	and	al, 0DFh
  3225 00009ABD A2[B13C0100]        <1> 	mov	[Y_N_nextline], al
  3226 00009AC2 3C59                <1> 	cmp	al, 'Y'
  3227 00009AC4 7404                <1> 	je	short loc_rmdir_yes_delete_directory
  3228 00009AC6 3C4E                <1> 	cmp	al, 'N'
  3229 00009AC8 75E6                <1> 	jne	short loc_rmdir_ask_again
  3230                              <1> 
  3231                              <1> loc_do_not_delete_directory:
  3232                              <1> loc_rmdir_yes_delete_directory:
  3233 00009ACA E809FFFFFF          <1> 	call	y_n_answer ; 29/12/2017
  3234 00009ACF 5F                  <1> 	pop	edi ; * (29/02/2016)
  3235                              <1> 	;cmp	al, 'Y' ; 'yes'
  3236                              <1> 	;cmc
  3237                              <1>         ;jnc	loc_file_rw_restore_retn
  3238 00009AD0 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3239 00009AD2 0F84C7FDFFFF        <1>         je	loc_file_rw_restore_retn 
  3240                              <1> 
  3241                              <1> 	; 29/12/2017
  3242 00009AD8 E869000000          <1> 	call	delete_sub_directory
  3243 00009ADD 7213                <1> 	jc	short loc_rmdir_cmd_failed
  3244                              <1> 
  3245                              <1> loc_rmdir_ok:
  3246 00009ADF BE[B53C0100]        <1> 	mov	esi, Msg_OK
  3247 00009AE4 E85CDAFFFF          <1> 	call	print_msg
  3248 00009AE9 E9B1FDFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3249                              <1> 
  3250                              <1> loc_rmdir_y_n_escape:
  3251 00009AEE B04E                <1> 	mov	al, 'N' ; 'no'
  3252 00009AF0 EBD8                <1>         jmp     loc_do_not_delete_directory
  3253                              <1> 
  3254                              <1> loc_rmdir_cmd_failed:
  3255                              <1> 	; 29/12/2017
  3256 00009AF2 09C0                <1> 	or	eax, eax ; EAX = 0 -> Directory not empty!
  3257 00009AF4 7426                <1> 	jz	short loc_rmdir_directory_not_empty
  3258                              <1> 
  3259                              <1> 	; EAX > 0 -> Error code in AL (or AX or EAX)
  3260                              <1> 
  3261 00009AF6 833D[72890100]01    <1> 	cmp	dword [FAT_ClusterCounter], 1
  3262 00009AFD 0F829CFDFFFF        <1> 	jb	loc_file_rw_cmd_failed	
  3263 00009B03 F9                  <1> 	stc
  3264                              <1> loc_rmdir_cmd_return:
  3265                              <1> 	; 01/03/2016
  3266 00009B04 9C                  <1> 	pushf
  3267                              <1> 	; ESI = Logical DOS Drive Description Table address	
  3268 00009B05 66BB00FF            <1> 	mov	bx, 0FF00h ; BH = FFh -> use ESI for Drive parameters
  3269                              <1> 	           ; BL = 0 -> Recalculate free cluster count
  3270 00009B09 50                  <1> 	push	eax
  3271 00009B0A E8C3380000          <1> 	call	calculate_fat_freespace	
  3272 00009B0F 58                  <1> 	pop	eax
  3273 00009B10 9D                  <1> 	popf
  3274 00009B11 0F8288FDFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3275 00009B17 E983FDFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3276                              <1> 
  3277                              <1> loc_rmdir_directory_not_empty:
  3278 00009B1C BE[DC3C0100]        <1> 	mov	esi, Msg_Dir_Not_Empty
  3279 00009B21 E81FDAFFFF          <1> 	call	print_msg
  3280                              <1> 	; 01/03/2016
  3281 00009B26 A1[72890100]        <1> 	mov	eax, [FAT_ClusterCounter]
  3282 00009B2B 09C0                <1> 	or	eax, eax ; 0 ?
  3283 00009B2D 0F846CFDFFFF        <1> 	jz	loc_file_rw_restore_retn
  3284                              <1> 	; ESI = Logical DOS Drive Description Table address	
  3285 00009B33 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> use ESI for Drive parameters
  3286                              <1> 	           ; BL = 1 -> add free clusters
  3287 00009B37 E896380000          <1> 	call	calculate_fat_freespace
  3288 00009B3C 09C9                <1> 	or	ecx, ecx
  3289 00009B3E 0F845BFDFFFF        <1>         jz      loc_file_rw_restore_retn ; ecx = 0 -> OK
  3290                              <1> 	; ecx > 0 -> Error (Recalculation is needed)
  3291 00009B44 EBBE                <1> 	jmp	short loc_rmdir_cmd_return
  3292                              <1> 
  3293                              <1> 
  3294                              <1> delete_sub_directory:
  3295                              <1> 	; 29/12/2017 
  3296                              <1> 	; (moved here from 'delete_directory' for 'sysrmdir' )
  3297                              <1> 
  3298                              <1> 	; EDI = Directory buffer entry offset/address
  3299                              <1> 
  3300                              <1> loc_rmdir_delete_short_name_check_dir_empty:
  3301 00009B46 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  3302 00009B4A C1E010              <1>         shl	eax, 16
  3303 00009B4D 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  3304                              <1> 
  3305                              <1> 	;mov 	[DelFile_FCluster], eax
  3306                              <1> 
  3307                              <1> 	;;mov	bx, [DirBuff_EntryCounter]
  3308                              <1> 	;mov	bx, [FindFile_DirEntryNumber] ; 27/02/2016
  3309                              <1> 	;mov	[DelFile_EntryCounter], bx
  3310                              <1> 
  3311 00009B51 29DB                <1>     	sub	ebx, ebx
  3312                              <1> 	; 29/12/2017
  3313 00009B53 891D[72890100]      <1> 	mov	[FAT_ClusterCounter], ebx ; 0 ; Reset
  3314                              <1> 
  3315 00009B59 8A3D[F68A0100]      <1> 	mov	bh, [FindFile_Drv]
  3316 00009B5F BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3317 00009B64 01DE                <1> 	add	esi, ebx
  3318                              <1> 
  3319 00009B66 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h
  3320 00009B6C 745A                <1> 	je	short loc_rmdir_check_fs_directory
  3321                              <1> 
  3322                              <1> 	;cmp	byte [esi+LD_FATType], 1
  3323                              <1> 	;jb	short loc_rmdir_get__last_cluster_0
  3324                              <1> 
  3325                              <1> 	; 29/12/2017
  3326 00009B6E 83F802              <1> 	cmp	eax, 2
  3327 00009B71 7306                <1> 	jnb	short loc_rmdir_get_last_cluster_1
  3328                              <1> 	; eax < 2
  3329                              <1> loc_rmdir_get_last_cluster_0:
  3330                              <1> 	;mov	eax, ERR_INV_FORMAT ; invalid format!
  3331 00009B73 B813000000          <1> 	mov	eax, ERR_NOT_DIR ; not a valid directory!
  3332                              <1> 	;stc
  3333 00009B78 C3                  <1> 	retn
  3334                              <1> 
  3335                              <1> loc_rmdir_get_last_cluster_1:
  3336 00009B79 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3 ; FAT32
  3337 00009B7D 750C                <1> 	jne	short loc_rmdir_get_last_cluster_2
  3338                              <1> 
  3339                              <1> 	; is it root directory ?
  3340 00009B7F 3B4632              <1> 	cmp	eax, [esi+LD_BPB+BPB_RootClus]
  3341 00009B82 7507                <1> 	jne	short loc_rmdir_get_last_cluster_2
  3342                              <1> 
  3343                              <1> 	; root directory can not be deleted !!
  3344                              <1> loc_rmdir_permission_denied:
  3345 00009B84 B80B000000          <1> 	mov	eax, ERR_PERM_DENIED ; permission denied!
  3346 00009B89 F9                  <1> 	stc
  3347 00009B8A C3                  <1> 	retn		
  3348                              <1> 
  3349                              <1> loc_rmdir_get_last_cluster_2:
  3350                              <1> 	; 29/12/2017
  3351 00009B8B A3[B88B0100]        <1> 	mov 	[DelFile_FCluster], eax
  3352                              <1> 	
  3353                              <1> 	;mov	dx, [DirBuff_EntryCounter]
  3354 00009B90 668B15[708B0100]    <1> 	mov	dx, [FindFile_DirEntryNumber] ; 27/02/2016
  3355 00009B97 668915[BC8B0100]    <1> 	mov	[DelFile_EntryCounter], dx
  3356                              <1> 	
  3357 00009B9E 8B15[81890100]      <1> 	mov	edx, [DirBuff_Cluster]
  3358 00009BA4 8915[E88B0100]      <1> 	mov	[RmDir_ParentDirCluster], edx
  3359                              <1> 
  3360 00009BAA 893D[E48B0100]      <1> 	mov	[RmDir_DirEntryOffset], edi
  3361                              <1> 
  3362                              <1> 	; 01/03/2016
  3363                              <1> 	;mov	dword [FAT_ClusterCounter], 0 ; Reset
  3364                              <1> 
  3365                              <1> loc_rmdir_get_last_cluster_3:
  3366 00009BB0 E89C390000          <1> 	call	get_last_cluster
  3367                              <1>         ;jc	loc_rmdir_cmd_failed
  3368 00009BB5 721E                <1> 	jc	short loc_delete_sub_dir_retn ; 29/12/2017
  3369                              <1> 	
  3370 00009BB7 3B05[B88B0100]      <1> 	cmp	eax, [DelFile_FCluster]
  3371 00009BBD 7517                <1> 	jne	short loc_rmdir_multi_dir_clusters
  3372                              <1> 
  3373 00009BBF C605[E38B0100]00    <1> 	mov	byte [RmDir_MultiClusters], 0
  3374 00009BC6 EB15                <1> 	jmp	short pass_rmdir_multi_dir_clusters
  3375                              <1> 
  3376                              <1> loc_rmdir_check_fs_directory:
  3377                              <1> 	; 29/12/2017
  3378 00009BC8 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  3379 00009BCC 75B6                <1> 	jne	short loc_rmdir_permission_denied
  3380                              <1> 
  3381                              <1> loc_rmdir_delete_fs_directory:
  3382 00009BCE E876130000          <1> 	call	delete_fs_directory
  3383                              <1> 	;jnc	loc_print_deleted_message
  3384 00009BD3 7300                <1> 	jnc	short loc_delete_sub_dir_retn ; 29/12/2017
  3385                              <1> 
  3386                              <1> 	; EAX=0 -> Directory not empty !
  3387                              <1> 	; EAX>0 -> Disk r/w error or another (misc) error
  3388                              <1> 	
  3389                              <1> 	;or	eax, eax
  3390                              <1> 	;jz	loc_rmdir_directory_not_empty_2         
  3391                              <1> 	;;stc
  3392                              <1> 	;;jmp	loc_file_rw_cmd_failed
  3393                              <1> 	
  3394                              <1> loc_delete_sub_dir_retn:
  3395 00009BD5 C3                  <1> 	retn
  3396                              <1>  
  3397                              <1> loc_rmdir_multi_dir_clusters:
  3398 00009BD6 C605[E38B0100]01    <1> 	mov	byte [RmDir_MultiClusters], 1
  3399                              <1> 
  3400                              <1> pass_rmdir_multi_dir_clusters:
  3401 00009BDD A3[EC8B0100]        <1> 	mov 	[RmDir_DirLastCluster], eax
  3402 00009BE2 890D[F08B0100]      <1> 	mov	[RmDir_PreviousCluster], ecx
  3403                              <1> 
  3404                              <1> loc_rmdir_load_fat_sub_directory:
  3405 00009BE8 E84F330000          <1> 	call	load_FAT_sub_directory
  3406                              <1> 	;jc	loc_rmdir_cmd_failed
  3407 00009BED 72E6                <1> 	jc	short loc_delete_sub_dir_retn
  3408                              <1> 
  3409                              <1> loc_rmdir_find_last_dir_entry:
  3410 00009BEF 56                  <1> 	push	esi
  3411 00009BF0 BE[DA8A0100]        <1> 	mov	esi, Dir_File_Name
  3412 00009BF5 C6062A              <1> 	mov	byte [esi], '*'
  3413 00009BF8 C646082A            <1> 	mov	byte [esi+8], '*'
  3414 00009BFC 31DB                <1> 	xor	ebx, ebx ; Entry offset  = 0
  3415                              <1> loc_rmdir_find_last_dir_entry_next:
  3416 00009BFE 66B80008            <1> 	mov	ax, 0800h ; Except volume/long names
  3417 00009C02 6631C9              <1> 	xor	cx, cx ; 0 = Find a valid file or dir name
  3418 00009C05 E87A170000          <1> 	call	find_directory_entry
  3419 00009C0A 7225                <1> 	jc	short loc_rmdir_empty_dir_cluster
  3420 00009C0C 83FB01              <1> 	cmp	ebx, 1
  3421 00009C0F 771B                <1> 	ja	short loc_rmdir_directory_not_empty_1
  3422                              <1> loc_rmdir_dot_entry_check:
  3423 00009C11 80FD2E              <1> 	cmp	ch, '.' ; The first char of the dir entry
  3424 00009C14 7516                <1> 	jne	short loc_rmdir_directory_not_empty_1
  3425 00009C16 08DB                <1> 	or	bl, bl
  3426 00009C18 7506                <1> 	jnz	short loc_rmdir_dotdot_entry_check
  3427 00009C1A 807F0120            <1> 	cmp	byte [edi+1], 20h
  3428 00009C1E EB06                <1> 	jmp	short pass_rmdir_dot_entry_check
  3429                              <1> 
  3430                              <1> loc_rmdir_dotdot_entry_check:
  3431 00009C20 66817F012E20        <1> 	cmp	word [edi+1], '. '
  3432                              <1> pass_rmdir_dot_entry_check:	
  3433 00009C26 7504                <1> 	jne	short loc_rmdir_directory_not_empty_1 
  3434 00009C28 FEC3                <1> 	inc	bl
  3435 00009C2A EBD2                <1> 	jmp	short loc_rmdir_find_last_dir_entry_next 
  3436                              <1> 
  3437                              <1> loc_rmdir_directory_not_empty_1:
  3438 00009C2C 58                  <1> 	pop	eax ; pushed esi 
  3439 00009C2D 31C0                <1> 	xor	eax, eax ; 0
  3440                              <1> loc_rmdir_directory_not_empty_2:
  3441                              <1> loc_delete_sub_dir_stc_retn:
  3442 00009C2F F9                  <1> 	stc
  3443 00009C30 C3                  <1> 	retn
  3444                              <1> 
  3445                              <1> loc_rmdir_empty_dir_cluster:
  3446 00009C31 5E                  <1> 	pop	esi
  3447                              <1> 
  3448                              <1> loc_rmdir_set_prev_cluster_dir_last_cluster:
  3449 00009C32 803D[E38B0100]00    <1> 	cmp	byte [RmDir_MultiClusters], 0
  3450 00009C39 7613                <1> 	jna	short loc_rmdir_unlink_dir_last_cluster
  3451                              <1> 
  3452 00009C3B A1[F08B0100]        <1> 	mov	eax, [RmDir_PreviousCluster]
  3453                              <1> 	;xor	ecx, ecx
  3454 00009C40 49                  <1> 	dec	ecx ; FFFFFFFFh
  3455 00009C41 E83A340000          <1> 	call	update_cluster
  3456 00009C46 7306                <1> 	jnc	short loc_rmdir_unlink_dir_last_cluster
  3457                              <1> 
  3458                              <1> 	; 01/03/2016
  3459                              <1> 	;cmp	eax, 1  ; eax = 0 -> end of cluster chain
  3460                              <1> 	;cmc 
  3461                              <1> 	;jc	short loc_rmdir_cmd_failed
  3462                              <1> 	;jmp	short loc_rmdir_save_fat_buffer
  3463                              <1> 	; 29/12/2017 
  3464 00009C48 21C0                <1> 	and	eax, eax
  3465 00009C4A 75E3                <1> 	jnz	short loc_delete_sub_dir_stc_retn
  3466 00009C4C EB12                <1> 	jmp	short loc_rmdir_save_fat_buffer	
  3467                              <1> 
  3468                              <1> loc_rmdir_unlink_dir_last_cluster:
  3469 00009C4E A1[EC8B0100]        <1> 	mov	eax, [RmDir_DirLastCluster]
  3470 00009C53 31C9                <1> 	xor	ecx, ecx ; 0
  3471 00009C55 E826340000          <1> 	call	update_cluster
  3472 00009C5A 7327                <1> 	jnc	short loc_rmdir_unlink_stc_retn_0Bh
  3473                              <1> 	; Because of it is the last cluster
  3474                              <1> 	; 'update_cluster' must return with eocc error 
  3475 00009C5C 09C0                <1> 	or	eax, eax
  3476                              <1> 	;jz	short loc_rmdir_save_fat_buffer ; eocc	
  3477                              <1> 	;stc
  3478                              <1>         ;jmp     short loc_rmdir_cmd_failed
  3479                              <1> 	; 29/12/2017
  3480 00009C5E 75CF                <1> 	jnz	short loc_delete_sub_dir_stc_retn
  3481                              <1> 	
  3482                              <1> loc_rmdir_save_fat_buffer:
  3483 00009C60 803D[6A890100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
  3484 00009C67 7528                <1> 	jne	short loc_rmdir_calculate_FAT_freespace
  3485 00009C69 E8CF360000          <1> 	call	save_fat_buffer
  3486                              <1> 	;jc	short loc_rmdir_cmd_failed
  3487                              <1> 	; 29/12/2017
  3488 00009C6E 7219                <1> 	jc	short loc_rmdir_unlink_error_retn
  3489                              <1> 
  3490                              <1> 	; 01/03/2016
  3491 00009C70 803D[E38B0100]00    <1> 	cmp	byte [RmDir_MultiClusters], 0
  3492 00009C77 7618                <1> 	jna	short loc_rmdir_calculate_FAT_freespace
  3493                              <1> 
  3494 00009C79 A1[B88B0100]        <1> 	mov	eax, [DelFile_FCluster]
  3495 00009C7E E92DFFFFFF          <1>         jmp     loc_rmdir_get_last_cluster_3
  3496                              <1> 
  3497                              <1> loc_rmdir_unlink_stc_retn_0Bh:
  3498                              <1> 	; 15/10/2016 (0Bh -> 28)
  3499 00009C83 B81C000000          <1> 	mov	eax, ERR_INV_FORMAT ; 28 = Invalid format
  3500                              <1> loc_rmdir_unlink_stc_retn:
  3501 00009C88 F9                  <1> 	stc
  3502                              <1> loc_rmdir_unlink_error_retn:
  3503 00009C89 C3                  <1> 	retn
  3504                              <1> 
  3505                              <1> loc_rmdir_delete_short_name_invalid_data:
  3506 00009C8A B81D000000          <1> 	mov	eax, 29 ; Invalid data (15/10/2016)
  3507                              <1> 	;stc
  3508                              <1>         ;jmp	loc_rmdir_cmd_failed
  3509                              <1> 	; 29/12/2017
  3510 00009C8F EBF7                <1> 	jmp	short loc_rmdir_unlink_stc_retn
  3511                              <1> 
  3512                              <1> loc_rmdir_calculate_FAT_freespace:
  3513                              <1> 	;mov	eax, [FAT_ClusterCounter]
  3514                              <1> 	; 29/12/2017
  3515 00009C91 29C0                <1> 	sub	eax, eax ; 0
  3516 00009C93 8705[72890100]      <1> 	xchg	eax, [FAT_ClusterCounter]
  3517                              <1> 	;
  3518 00009C99 66BB01FF            <1> 	mov	bx, 0FF01h
  3519                              <1> 	; BL = 1 -> Add EAX to free space count
  3520                              <1> 	; BH = FFh ->
  3521                              <1> 	; ESI = Logical DOS Drive Description Table address
  3522 00009C9D E830370000          <1> 	call	calculate_fat_freespace
  3523                              <1> 
  3524 00009CA2 21C9                <1> 	and	ecx, ecx ; ecx = 0 -> valid free sector count
  3525 00009CA4 7409                <1> 	jz 	short loc_rmdir_delete_short_name_continue
  3526                              <1> 
  3527                              <1> loc_rmdir_recalculate_FAT_freespace:
  3528 00009CA6 66BB00FF            <1>         mov     bx, 0FF00h ; BL = 0 -> Recalculate free space
  3529 00009CAA E823370000          <1> 	call	calculate_fat_freespace
  3530                              <1> 	          
  3531                              <1> loc_rmdir_delete_short_name_continue:
  3532 00009CAF A1[E88B0100]        <1> 	mov	eax, [RmDir_ParentDirCluster]
  3533 00009CB4 83F802              <1> 	cmp	eax, 2
  3534 00009CB7 7309                <1> 	jnb	short loc_rmdir_del_short_name_load_sub_dir
  3535 00009CB9 E8F3310000          <1> 	call	load_FAT_root_directory
  3536                              <1> 	;jc	loc_file_rw_cmd_failed
  3537                              <1> 	; 29/12/2017
  3538 00009CBE 72C9                <1> 	jc	short loc_rmdir_unlink_error_retn
  3539 00009CC0 EB07                <1> 	jmp	short loc_rmdir_del_short_name_ld_chk_fclust
  3540                              <1> 
  3541                              <1> loc_rmdir_del_short_name_load_sub_dir:	
  3542 00009CC2 E875320000          <1> 	call	load_FAT_sub_directory
  3543                              <1> 	;jc	loc_file_rw_cmd_failed
  3544                              <1> 	; 29/12/2017
  3545 00009CC7 72C0                <1> 	jc	short loc_rmdir_unlink_error_retn
  3546                              <1> 
  3547                              <1> loc_rmdir_del_short_name_ld_chk_fclust:
  3548 00009CC9 0FB73D[E48B0100]    <1> 	movzx	edi, word [RmDir_DirEntryOffset]
  3549 00009CD0 81C700000800        <1> 	add	edi, Directory_Buffer
  3550                              <1> 
  3551 00009CD6 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  3552 00009CDA C1E010              <1> 	shl	eax, 16
  3553 00009CDD 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  3554                              <1>         ; Not necessary... 
  3555 00009CE1 3B05[B88B0100]      <1> 	cmp	eax, [DelFile_FCluster]
  3556 00009CE7 75A1                <1> 	jne	short loc_rmdir_delete_short_name_invalid_data
  3557                              <1> 	;
  3558 00009CE9 C607E5              <1> 	mov	byte [edi], 0E5h ; 'Deleted' sign
  3559                              <1> 	; 27/02/2016
  3560                              <1> 	; TRDOS v1 has a bug here! it does not set
  3561                              <1> 	; 'DirBuff_ValidData' to 2; as result of this bug,
  3562                              <1> 	; 'save_directory_buffer' would not save the change ! 
  3563 00009CEC C605[7C890100]02    <1>   	mov	byte [DirBuff_ValidData], 2 ; change sign
  3564                              <1> 	;
  3565 00009CF3 E8AE1D0000          <1> 	call	save_directory_buffer
  3566                              <1> 	;jc	loc_file_rw_cmd_failed
  3567                              <1> 	; 29/12/2017
  3568 00009CF8 728F                <1> 	jc	short loc_rmdir_unlink_error_retn
  3569                              <1> 
  3570                              <1> loc_rmdir_del_long_name:
  3571 00009CFA 0FB615[BE8B0100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  3572 00009D01 08D2                <1> 	or	dl, dl
  3573 00009D03 7410                <1> 	jz	short loc_rmdir_update_parent_dir_lmdt
  3574                              <1>              
  3575 00009D05 0FB705[BC8B0100]    <1> 	movzx	eax, word [DelFile_EntryCounter]
  3576 00009D0C 29D0                <1> 	sub	eax, edx
  3577                              <1> 	; 29/12/2017
  3578 00009D0E 7205                <1> 	jc	short loc_rmdir_update_parent_dir_lmdt
  3579                              <1>  
  3580                              <1>  	; EAX = Directory Entry Number of the long name last entry
  3581 00009D10 E8EF1E0000          <1> 	call	delete_longname
  3582                              <1> 
  3583                              <1> loc_rmdir_update_parent_dir_lmdt:
  3584 00009D15 E8271E0000          <1> 	call	update_parent_dir_lmdt
  3585                              <1> 	;jc	short loc_file_rw_cmd_failed
  3586                              <1> 	; 29/12/2017
  3587                              <1> 	;jc	short loc_rmdir_unlink_error_retn
  3588                              <1> 
  3589                              <1> loc_delete_sub_directory_ok:
  3590                              <1> 	; 29/12/2017
  3591 00009D1A 31C0                <1> 	xor	eax, eax ;  0 ;  cf = 0
  3592 00009D1C C3                  <1> 	retn
  3593                              <1> 
  3594                              <1> 
  3595                              <1> delete_file:
  3596                              <1> 	; 29/02/2016
  3597                              <1> 	; 28/02/2016 (TRDOS 386 = TRDOS v2.0)
  3598                              <1> 	; 09/08/2010 (CMD_INTR.ASM, 'cmp_cmd_del')
  3599                              <1> 	; 28/02/2010
  3600                              <1> 
  3601                              <1> get_delfile_fchar:
  3602                              <1> 	; esi = file name
  3603 00009D1D 803E20              <1> 	cmp	byte [esi], 20h
  3604 00009D20 7701                <1>         ja	short loc_delfile_parse_path_name
  3605                              <1> 
  3606                              <1> loc_delfile_nofilename_retn:
  3607 00009D22 C3                  <1> 	retn
  3608                              <1> 
  3609                              <1> loc_delfile_parse_path_name:
  3610 00009D23 BF[F68A0100]        <1> 	mov	edi, FindFile_Drv
  3611 00009D28 E815190000          <1> 	call	parse_path_name
  3612 00009D2D 0F822EF2FFFF        <1> 	jc	loc_cmd_failed
  3613                              <1> 
  3614                              <1> loc_delfile_check_filename_exists:
  3615 00009D33 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  3616 00009D38 803E20              <1> 	cmp	byte [esi], 20h
  3617 00009D3B 0F8620F2FFFF        <1> 	jna	loc_cmd_failed
  3618 00009D41 8935[B48B0100]      <1> 	mov	[DelFile_FNPointer], esi 
  3619                              <1> 
  3620                              <1> loc_delfile_drv:
  3621 00009D47 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
  3622 00009D4D 8A35[56820100]      <1> 	mov	dh, [Current_Drv]
  3623 00009D53 8835[B2890100]      <1> 	mov	[RUN_CDRV], dh
  3624 00009D59 38F2                <1> 	cmp	dl, dh
  3625 00009D5B 740B                <1> 	je	short loc_delfile_change_directory
  3626                              <1> 
  3627 00009D5D E86CE3FFFF          <1> 	call	change_current_drive
  3628 00009D62 0F8237FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3629                              <1> 
  3630                              <1> loc_delfile_change_directory:
  3631 00009D68 803D[F78A0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3632 00009D6F 7618                <1> 	jna	short loc_delfile_find
  3633                              <1> 
  3634 00009D71 FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  3635 00009D77 BE[F78A0100]        <1> 	mov	esi, FindFile_Directory
  3636 00009D7C 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3637 00009D7E E8A9120000          <1> 	call	change_current_directory
  3638 00009D83 0F8216FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3639                              <1> 
  3640                              <1> ;loc_delfile_change_prompt_dir_string:
  3641                              <1> 	;call	change_prompt_dir_string
  3642                              <1> 
  3643                              <1> loc_delfile_find:
  3644                              <1> 	;mov	esi, FindFile_Name
  3645 00009D89 8B35[B48B0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3646 00009D8F 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  3647 00009D93 E8D9F6FFFF          <1> 	call	find_first_file
  3648 00009D98 0F8201FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3649                              <1> 
  3650                              <1> loc_delfile_ambgfn_check:
  3651 00009D9E 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3652 00009DA1 740B                <1> 	jz	short loc_delfile_found
  3653                              <1> 
  3654                              <1> loc_file_not_found:
  3655 00009DA3 B802000000          <1> 	mov	eax, 2 ; File not found sign
  3656 00009DA8 F9                  <1> 	stc
  3657 00009DA9 E9F1FAFFFF          <1> 	jmp	loc_file_rw_cmd_failed   
  3658                              <1> 
  3659                              <1> loc_delfile_found:
  3660 00009DAE 80E307              <1> 	and	bl, 07h ; Attributes
  3661 00009DB1 0F85F2FAFFFF        <1>         jnz     loc_permission_denied
  3662                              <1> 
  3663                              <1> ;loc_delfile_found_save_lnel:
  3664                              <1> ;	mov	[DelFile_LNEL], bh ; Long name entry length (if > 0)
  3665                              <1> 
  3666                              <1> loc_delfile_ask_for_delete:
  3667 00009DB7 57                  <1> 	push	edi ; * (29/02/2016)
  3668                              <1> 
  3669 00009DB8 BE[F33C0100]        <1> 	mov	esi, Msg_DoYouWantDelete
  3670 00009DBD E883D7FFFF          <1> 	call	print_msg
  3671 00009DC2 8B35[B48B0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3672 00009DC8 E878D7FFFF          <1> 	call	print_msg
  3673 00009DCD BE[A73C0100]        <1> 	mov	esi, Msg_YesNo
  3674 00009DD2 E86ED7FFFF          <1> 	call	print_msg
  3675                              <1> 
  3676                              <1> loc_delfile_ask_again:
  3677 00009DD7 30E4                <1> 	xor	ah, ah
  3678 00009DD9 E80771FFFF          <1> 	call	int16h
  3679 00009DDE 3C1B                <1> 	cmp	al, 1Bh
  3680                              <1> 	;je	short loc_do_not_delete_file
  3681 00009DE0 7449                <1> 	je	short loc_delfile_y_n_escape ; 06/03/2016
  3682 00009DE2 24DF                <1> 	and	al, 0DFh
  3683 00009DE4 A2[B13C0100]        <1> 	mov	[Y_N_nextline], al
  3684 00009DE9 3C59                <1> 	cmp	al, 'Y'
  3685 00009DEB 7404                <1> 	je	short loc_yes_delete_file
  3686 00009DED 3C4E                <1> 	cmp	al, 'N'
  3687 00009DEF 75E6                <1> 	jne	short loc_delfile_ask_again
  3688                              <1> 
  3689                              <1> loc_do_not_delete_file:
  3690                              <1> loc_yes_delete_file:
  3691 00009DF1 E8E2FBFFFF          <1> 	call	y_n_answer ; 29/12/2017
  3692 00009DF6 5F                  <1> 	pop	edi ; * (29/02/2016)
  3693                              <1> 	;cmp	al, 'Y' ; 'yes'
  3694                              <1> 	;cmc
  3695                              <1>         ;jnc	loc_file_rw_restore_retn
  3696 00009DF7 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3697 00009DF9 0F84A0FAFFFF        <1>         je	loc_file_rw_restore_retn  
  3698                              <1> 
  3699                              <1> loc_delete_file:
  3700 00009DFF 8A3D[F68A0100]      <1> 	mov	bh, [FindFile_Drv]
  3701                              <1> 	;mov	bl, [DelFile_LNEL]
  3702 00009E05 8A1D[458B0100]      <1> 	mov	bl, [FindFile_LongNameEntryLength]
  3703                              <1> 	;mov	cx, [DirBuff_EntryCounter]
  3704 00009E0B 668B0D[708B0100]    <1> 	mov	cx, [FindFile_DirEntryNumber]
  3705                              <1> 	; (*) EDI = Directory buffer entry offset/address 
  3706 00009E12 E8D71F0000          <1> 	call	remove_file ; (FILE.ASM, 'proc_delete_file')
  3707 00009E17 0F8378FAFFFF        <1> 	jnc	loc_print_deleted_message
  3708                              <1> 
  3709                              <1> 	;cmp	al, 05h
  3710 00009E1D 3C0B                <1> 	cmp	al, ERR_PERM_DENIED  ; 29/12/2017 (5 -> 11)
  3711 00009E1F 0F8484FAFFFF        <1> 	je	loc_permission_denied
  3712 00009E25 F9                  <1> 	stc
  3713 00009E26 E974FAFFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3714                              <1> 
  3715                              <1> loc_delfile_y_n_escape:
  3716 00009E2B B04E                <1> 	mov	al, 'N' ; 'no'
  3717 00009E2D EBC2                <1> 	jmp	short loc_do_not_delete_file
  3718                              <1> 
  3719                              <1> set_file_attributes:
  3720                              <1> 	; 06/03/2016
  3721                              <1> 	; 04/03/2016 (TRDOS 386 = TRDOS v2.0)
  3722                              <1> 	; 10/07/2010 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_attrib')
  3723                              <1> 	; 23/05/2010 
  3724                              <1> 	; 17/12/2000 (P2000.ASM)
  3725                              <1> 
  3726                              <1> 	; esi = file or directory name
  3727 00009E2F 6631C0              <1> 	xor	ax, ax
  3728 00009E32 66A3[443D0100]      <1> 	mov	[Attr_Chars], ax
  3729 00009E38 A2[0C8C0100]        <1> 	mov	[Attributes], al
  3730                              <1> 
  3731                              <1> get_attrib_fchar:
  3732                              <1> 	; esi = file name
  3733 00009E3D 8A06                <1> 	mov	al, [esi]
  3734 00009E3F 3C20                <1> 	cmp	al, 20h
  3735 00009E41 7623                <1> 	jna	short loc_attr_file_nofilename_retn
  3736                              <1> 
  3737                              <1> loc_scan_attrib_params:
  3738 00009E43 3C2D                <1> 	cmp	al, '-'
  3739 00009E45 0F871C010000        <1> 	ja	loc_attr_file_parse_path_name
  3740 00009E4B 7408                <1> 	je	short loc_attr_space
  3741                              <1> 
  3742 00009E4D 3C2B                <1> 	cmp	al, '+'
  3743 00009E4F 0F850CF1FFFF        <1> 	jne	loc_cmd_failed
  3744                              <1> 
  3745                              <1> loc_attr_space:
  3746 00009E55 8A6601              <1> 	mov	ah, [esi+1]
  3747 00009E58 80FC20              <1>  	cmp	ah, 20h
  3748 00009E5B 770A                <1> 	ja	short pass_attr_space
  3749 00009E5D 0F82FEF0FFFF        <1> 	jb	loc_cmd_failed
  3750 00009E63 46                  <1> 	inc	esi
  3751 00009E64 EBEF                <1> 	jmp	short loc_attr_space
  3752                              <1> 
  3753                              <1> loc_attr_file_nofilename_retn:
  3754 00009E66 C3                  <1> 	retn
  3755                              <1> 
  3756                              <1> pass_attr_space:
  3757 00009E67 80E4DF              <1> 	and	ah, 0DFh
  3758 00009E6A 80FC53              <1> 	cmp	ah, 'S'
  3759 00009E6D 0F87EEF0FFFF        <1> 	ja	loc_cmd_failed
  3760 00009E73 7204                <1> 	jb	short pass_attr_system
  3761 00009E75 B404                <1> 	mov	ah, 04h   ; System
  3762 00009E77 EB21                <1> 	jmp	short pass_attr_archive
  3763                              <1> 
  3764                              <1> pass_attr_system:
  3765 00009E79 80FC48              <1> 	cmp	ah, 'H'
  3766 00009E7C 7706                <1> 	ja	short pass_attr_hidden
  3767 00009E7E 7213                <1> 	jb	short pass_attr_read_only
  3768 00009E80 B402                <1> 	mov	ah, 02h    ; Hidden
  3769 00009E82 EB16                <1> 	jmp	short pass_attr_archive
  3770                              <1> 
  3771                              <1> pass_attr_hidden:
  3772 00009E84 80FC52              <1> 	cmp	ah, 'R'
  3773 00009E87 0F87D4F0FFFF        <1> 	ja	loc_cmd_failed
  3774 00009E8D 7204                <1> 	jb	short pass_attr_read_only ; Read only
  3775 00009E8F B401                <1> 	mov	ah, 01h
  3776 00009E91 EB07                <1> 	jmp	short pass_attr_archive
  3777                              <1> 
  3778                              <1> pass_attr_read_only:
  3779 00009E93 80FC41              <1> 	cmp	ah, 'A'
  3780 00009E96 753B                <1> 	jne	short loc_chk_attr_enter
  3781 00009E98 B420                <1> 	mov	ah, 20h    ; Archive
  3782                              <1> 
  3783                              <1> pass_attr_archive:
  3784 00009E9A 3C2D                <1> 	cmp	al, '-'
  3785 00009E9C 7508                <1> 	jne	short pass_reducing_attributes
  3786 00009E9E 0825[443D0100]      <1> 	or	[Attr_Chars], ah
  3787 00009EA4 EB06                <1> 	jmp	short loc_change_attributes_inc
  3788                              <1> 
  3789                              <1> pass_reducing_attributes:
  3790 00009EA6 0825[453D0100]      <1> 	or	[Attr_Chars+1], ah
  3791                              <1> 
  3792                              <1> loc_change_attributes_inc:
  3793 00009EAC 46                  <1> 	inc	esi
  3794 00009EAD 8A6601              <1> 	mov	ah, [esi+1]
  3795 00009EB0 80FC20              <1> 	cmp	ah, 20h
  3796 00009EB3 7227                <1> 	jb	short pass_change_attr
  3797 00009EB5 74F5                <1> 	je	short loc_change_attributes_inc
  3798 00009EB7 80FC2D              <1> 	cmp	ah, '-'
  3799 00009EBA 770D                <1> 	ja	short loc_chk_next_attr_char1
  3800 00009EBC 7405                <1> 	je	short loc_chk_next_attr_char0
  3801 00009EBE 80FC2B              <1> 	cmp	ah, '+'
  3802 00009EC1 7506                <1> 	jne	short loc_chk_next_attr_char1
  3803                              <1> 
  3804                              <1> loc_chk_next_attr_char0:
  3805 00009EC3 46                  <1> 	inc	esi
  3806 00009EC4 668B06              <1> 	mov	ax, [esi]
  3807 00009EC7 EB9E                <1> 	jmp	short pass_attr_space
  3808                              <1> 
  3809                              <1> loc_chk_next_attr_char1:
  3810 00009EC9 803E2D              <1> 	cmp	byte [esi], '-'
  3811 00009ECC 7799                <1> 	ja	short pass_attr_space
  3812 00009ECE E988000000          <1>         jmp     loc_attr_file_check_fname_fchar
  3813                              <1> 
  3814                              <1> loc_chk_attr_enter:
  3815 00009ED3 80FC0D              <1> 	cmp	ah, 0Dh
  3816 00009ED6 0F8585F0FFFF        <1> 	jne	loc_cmd_failed
  3817                              <1> 
  3818                              <1> pass_change_attr:
  3819 00009EDC A0[443D0100]        <1> 	mov	al, [Attr_Chars]
  3820 00009EE1 F6D0                <1> 	not	al
  3821 00009EE3 2005[0C8C0100]      <1> 	and	[Attributes], al
  3822 00009EE9 A0[453D0100]        <1> 	mov	al, [Attr_Chars+1]
  3823 00009EEE 0805[0C8C0100]      <1> 	or	[Attributes], al
  3824                              <1> 
  3825                              <1> loc_show_attributes:
  3826 00009EF4 BE[BF440100]        <1> 	mov	esi, nextline
  3827 00009EF9 E847D6FFFF          <1> 	call	print_msg
  3828                              <1> 
  3829                              <1> loc_show_attributes_no_nextline:
  3830 00009EFE C705[443D0100]4E4F- <1> 	mov	dword [Attr_Chars], 'NORM'
  3830 00009F06 524D                <1>
  3831 00009F08 66C705[483D0100]41- <1> 	mov	word [Attr_Chars+4], 'AL'
  3831 00009F10 4C                  <1>
  3832 00009F11 BE[443D0100]        <1> 	mov	esi, Attr_Chars
  3833 00009F16 A0[0C8C0100]        <1> 	mov	al, [Attributes]
  3834 00009F1B A804                <1> 	test	al, 04h
  3835 00009F1D 7406                <1> 	jz	short pass_put_attr_s
  3836 00009F1F 66C7065300          <1> 	mov	word [esi], 0053h     ; S
  3837 00009F24 46                  <1> 	inc	esi
  3838                              <1> 
  3839                              <1> pass_put_attr_s:
  3840 00009F25 A802                <1> 	test	al, 02h
  3841 00009F27 7406                <1> 	jz	short pass_put_attr_h
  3842 00009F29 66C7064800          <1> 	mov	word [esi], 0048h     ; H
  3843 00009F2E 46                  <1> 	inc	esi
  3844                              <1> 
  3845                              <1> pass_put_attr_h:
  3846 00009F2F A801                <1> 	test	al, 01h
  3847 00009F31 7406                <1> 	jz	short pass_put_attr_r
  3848 00009F33 66C7065200          <1> 	mov	word [esi], 0052h     ; R
  3849 00009F38 46                  <1> 	inc	esi
  3850                              <1> 
  3851                              <1> pass_put_attr_r:
  3852 00009F39 3C20                <1> 	cmp	al, 20h
  3853 00009F3B 7205                <1> 	jb	short pass_put_attr_a
  3854 00009F3D 66C7064100          <1> 	mov	word [esi], 0041h     ; A
  3855                              <1> 
  3856                              <1> pass_put_attr_a:
  3857 00009F42 BE[373D0100]        <1> 	mov	esi, Str_Attributes
  3858 00009F47 E8F9D5FFFF          <1> 	call	print_msg
  3859 00009F4C BE[BF440100]        <1> 	mov	esi, nextline
  3860 00009F51 E8EFD5FFFF          <1> 	call	print_msg
  3861 00009F56 E944F9FFFF          <1> 	jmp	loc_file_rw_restore_retn 
  3862                              <1> 
  3863                              <1> loc_attr_file_check_fname_fchar:
  3864 00009F5B 46                  <1> 	inc	esi
  3865 00009F5C 803E20              <1> 	cmp	byte [esi], 20h
  3866 00009F5F 74FA                <1> 	je	short loc_attr_file_check_fname_fchar
  3867 00009F61 0F8275FFFFFF        <1>         jb      pass_change_attr
  3868                              <1> 		   
  3869                              <1> loc_attr_file_parse_path_name:
  3870 00009F67 BF[F68A0100]        <1> 	mov	edi, FindFile_Drv
  3871 00009F6C E8D1160000          <1> 	call	parse_path_name
  3872 00009F71 0F82EAEFFFFF        <1> 	jc	loc_cmd_failed
  3873                              <1> 
  3874                              <1> loc_attr_file_check_filename_exists:
  3875 00009F77 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  3876 00009F7C 803E20              <1> 	cmp	byte [esi], 20h
  3877 00009F7F 0F86DCEFFFFF        <1> 	jna	loc_cmd_failed
  3878 00009F85 8935[B48B0100]      <1> 	mov	[DelFile_FNPointer], esi 
  3879                              <1> 
  3880                              <1> loc_attr_file_drv:
  3881 00009F8B 8A35[56820100]      <1> 	mov	dh, [Current_Drv]
  3882 00009F91 8835[B2890100]      <1> 	mov	[RUN_CDRV], dh
  3883                              <1> 
  3884 00009F97 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
  3885 00009F9D 38F2                <1> 	cmp	dl, dh
  3886 00009F9F 740B                <1> 	je	short loc_attr_file_change_directory
  3887                              <1> 
  3888 00009FA1 E828E1FFFF          <1> 	call	change_current_drive
  3889 00009FA6 0F82F3F8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3890                              <1> 
  3891                              <1> loc_attr_file_change_directory:
  3892 00009FAC 803D[F78A0100]20    <1>         cmp     byte [FindFile_Directory], 20h
  3893 00009FB3 7618                <1> 	jna	short loc_attr_file_find
  3894                              <1> 
  3895 00009FB5 FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  3896                              <1> 	
  3897 00009FBB BE[F78A0100]        <1> 	mov	esi, FindFile_Directory
  3898 00009FC0 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3899 00009FC2 E865100000          <1> 	call	change_current_directory
  3900 00009FC7 0F82D2F8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3901                              <1> 
  3902                              <1> ;loc_attr_file_change_prompt_dir_string:
  3903                              <1> 	;call	change_prompt_dir_string
  3904                              <1> 
  3905                              <1> loc_attr_file_find:
  3906                              <1> 	;mov	esi, FindFile_Name
  3907 00009FCD 8B35[B48B0100]      <1> 	mov	esi, [DelFile_FNPointer]
  3908 00009FD3 66B80008            <1> 	mov	ax, 0800h ; Except volume labels
  3909 00009FD7 E895F4FFFF          <1> 	call	find_first_file
  3910 00009FDC 0F82BDF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3911                              <1> 
  3912                              <1> loc_attr_file_ambgfn_check:
  3913 00009FE2 6609D2              <1> 	or	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3914                              <1> 	;	(Note: It was BX in TRDOS v1)
  3915                              <1> 	;jz	short loc_attr_file_found
  3916 00009FE5 0F85B8FDFFFF        <1>         jnz     loc_file_not_found ; 06/03/2016 
  3917                              <1> 
  3918                              <1> 	;mov	eax, 2 ; File not found sign
  3919                              <1> 	;stc
  3920                              <1> 	;jmp	loc_file_rw_cmd_failed   
  3921                              <1> 
  3922                              <1> loc_attr_file_found:
  3923                              <1> 	; EDI = Directory buffer entry offset/address
  3924                              <1> 	; BL = File (or Directory) Attributes 
  3925                              <1> 	;	(Note: It was 'CL' in TRDOS v1)
  3926                              <1> 	; mov	bl, [EDI+0Bh]
  3927                              <1> 	
  3928 00009FEB 66833D[443D0100]00  <1> 	cmp	word [Attr_Chars], 0
  3929 00009FF3 770B                <1> 	ja	short loc_attr_file_change_attributes
  3930 00009FF5 881D[0C8C0100]      <1> 	mov	[Attributes], bl
  3931 00009FFB E9F4FEFFFF          <1> 	jmp	loc_show_attributes
  3932                              <1> 
  3933                              <1> loc_attr_file_change_attributes:
  3934 0000A000 A0[443D0100]        <1> 	mov	al, [Attr_Chars]
  3935 0000A005 F6D0                <1> 	not	al
  3936 0000A007 20C3                <1> 	and	bl, al
  3937 0000A009 A0[453D0100]        <1> 	mov	al, [Attr_Chars+1]
  3938 0000A00E 08C3                <1> 	or	bl, al
  3939                              <1> 
  3940 0000A010 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h ; Singlix FS
  3941 0000A016 741D                <1> 	je	short loc_attr_file_fs_check
  3942                              <1> 
  3943 0000A018 881D[0C8C0100]      <1> 	mov	[Attributes], bl
  3944 0000A01E 885F0B              <1> 	mov	[edi+0Bh], bl    ; Attributes (New!)
  3945                              <1> 
  3946                              <1> 	; 04/03/2016
  3947                              <1> 	; TRDOS v1 has a bug here! it does not set
  3948                              <1> 	; 'DirBuff_ValidData' to 2; as result of this bug,
  3949                              <1> 	; 'save_directory_buffer' would not save the new attributes ! 
  3950                              <1> 	
  3951 0000A021 C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  3952                              <1> 
  3953 0000A028 E8791A0000          <1> 	call 	save_directory_buffer
  3954 0000A02D 0F826CF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3955                              <1> 
  3956 0000A033 EB33                <1> 	jmp	short loc_print_attr_changed_message
  3957                              <1> 
  3958                              <1> loc_attr_file_fs_check:
  3959 0000A035 29C0                <1> 	sub	eax, eax
  3960 0000A037 8A25[7A890100]      <1>         mov     ah, [DirBuff_DRV]
  3961 0000A03D BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3962 0000A042 01C6                <1>         add     esi, eax
  3963 0000A044 807E04A1            <1>         cmp     byte [esi+LD_FSType], 0A1h
  3964 0000A048 7309                <1> 	jnc	short loc_attr_file_change_fs_file_attributes
  3965                              <1> 	; 29/12/2017 (0Dh -> 29)	
  3966 0000A04A 66B81D00            <1> 	mov	ax, 29 ; Invalid Data
  3967 0000A04E E94CF8FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3968                              <1> 
  3969                              <1> loc_attr_file_change_fs_file_attributes:
  3970                              <1> 	; BL = New MS-DOS File Attributes
  3971 0000A053 88D8                <1> 	mov	al, bl ; File/Directory Attributes
  3972 0000A055 30E4                <1> 	xor	ah, ah ; Attributes in MS-DOS format sign	  
  3973 0000A057 E873050000          <1> 	call	change_fs_file_attributes
  3974 0000A05C 0F823DF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3975                              <1> 
  3976 0000A062 881D[0C8C0100]      <1> 	mov	[Attributes], bl 
  3977                              <1> 
  3978                              <1> loc_print_attr_changed_message:
  3979 0000A068 BE[323D0100]        <1> 	mov	esi, Msg_New
  3980 0000A06D E8D3D4FFFF          <1> 	call	print_msg
  3981 0000A072 E987FEFFFF          <1> 	jmp	loc_show_attributes_no_nextline
  3982                              <1> 
  3983                              <1> rename_file:
  3984                              <1> 	; 13/11/2017
  3985                              <1> 	; 06/11/2016
  3986                              <1> 	; 05/11/2016
  3987                              <1> 	; 16/10/2016
  3988                              <1> 	; 08/03/2016
  3989                              <1> 	; 06/03/2016 (TRDOS 386 = TRDOS v2.0)
  3990                              <1> 	; 20/11/2010 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_rename')
  3991                              <1> 	; 16/11/2010 
  3992                              <1> 
  3993                              <1> get_rename_source_fchar:
  3994                              <1> 	; esi = file name
  3995 0000A077 803E20              <1> 	cmp	byte [esi], 20h
  3996 0000A07A 7614                <1>         jna	short loc_rename_nofilename_retn
  3997                              <1> 
  3998 0000A07C 8935[348C0100]      <1> 	mov	[SourceFilePath], esi
  3999                              <1> 
  4000                              <1> rename_scan_source_file:
  4001 0000A082 46                  <1> 	inc	esi
  4002 0000A083 803E20              <1> 	cmp	byte [esi], 20h
  4003 0000A086 7409                <1> 	je	short rename_scan_destination_file_1
  4004                              <1> 	;jb	short loc_rename_nofilename_retn
  4005 0000A088 0F82D3EEFFFF        <1> 	jb	loc_cmd_failed
  4006 0000A08E EBF2                <1> 	jmp	short rename_scan_source_file
  4007                              <1> 
  4008                              <1> loc_rename_nofilename_retn: ; 08/03/2016
  4009 0000A090 C3                  <1> 	retn
  4010                              <1> 
  4011                              <1> rename_scan_destination_file_1:
  4012 0000A091 C60600              <1> 	mov	byte [esi], 0
  4013                              <1> 
  4014                              <1> rename_scan_destination_file_2:
  4015 0000A094 46                  <1> 	inc	esi  
  4016 0000A095 803E20              <1> 	cmp	byte [esi], 20h
  4017 0000A098 74FA                <1> 	je	short rename_scan_destination_file_2
  4018                              <1> 	;jb	short loc_rename_nofilename_retn
  4019 0000A09A 0F82C1EEFFFF        <1> 	jb	loc_cmd_failed
  4020                              <1> 
  4021 0000A0A0 8935[388C0100]      <1> 	mov	[DestinationFilePath], esi
  4022                              <1> 
  4023                              <1> rename_scan_destination_file_3:
  4024 0000A0A6 46                  <1> 	inc	esi  
  4025 0000A0A7 803E20              <1> 	cmp	byte [esi], 20h
  4026 0000A0AA 77FA                <1> 	ja	short rename_scan_destination_file_3
  4027                              <1> 
  4028 0000A0AC C60600              <1> 	mov	byte [esi], 0
  4029                              <1> 
  4030                              <1> loc_rename_save_current_drive:
  4031 0000A0AF 8A35[56820100]      <1> 	mov	dh, [Current_Drv]
  4032 0000A0B5 8835[B2890100]      <1> 	mov	byte [RUN_CDRV], dh
  4033                              <1> 
  4034                              <1> loc_rename_sf_parse_path_name:
  4035 0000A0BB 8B35[348C0100]      <1> 	mov	esi, [SourceFilePath] 
  4036 0000A0C1 BF[F68A0100]        <1> 	mov	edi, FindFile_Drv
  4037 0000A0C6 E877150000          <1> 	call	parse_path_name
  4038 0000A0CB 0F8290EEFFFF        <1> 	jc	loc_cmd_failed
  4039                              <1> 
  4040                              <1> loc_rename_sf_check_filename_exists:
  4041 0000A0D1 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  4042 0000A0D6 803E20              <1> 	cmp	byte [esi], 20h
  4043 0000A0D9 0F8682EEFFFF        <1> 	jna	loc_cmd_failed
  4044                              <1> 
  4045                              <1> 	;mov	[DelFile_FNPointer], esi 
  4046                              <1> 
  4047                              <1> loc_rename_sf_drv:
  4048                              <1> 	;mov	dh, [Current_Drv]
  4049                              <1> 	;mov	[RUN_CDRV], dh
  4050                              <1> 
  4051 0000A0DF 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
  4052 0000A0E5 38F2                <1> 	cmp	dl, dh ; dh = [Current_Drv]
  4053 0000A0E7 740B                <1> 	je	short rename_sf_change_directory
  4054                              <1> 
  4055 0000A0E9 E8E0DFFFFF          <1> 	call	change_current_drive
  4056 0000A0EE 0F82ABF7FFFF        <1> 	jc	loc_file_rw_cmd_failed
  4057                              <1> 
  4058                              <1> rename_sf_change_directory:
  4059 0000A0F4 803D[F78A0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  4060 0000A0FB 7618                <1> 	jna	short rename_sf_find
  4061                              <1> 
  4062 0000A0FD FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  4063 0000A103 BE[F78A0100]        <1> 	mov	esi, FindFile_Directory
  4064 0000A108 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  4065 0000A10A E81D0F0000          <1> 	call	change_current_directory
  4066 0000A10F 0F828AF7FFFF        <1>  	jc	loc_file_rw_cmd_failed
  4067                              <1> 
  4068                              <1> ;rename_sf_change_prompt_dir_string:
  4069                              <1> 	;call	change_prompt_dir_string
  4070                              <1> 
  4071                              <1> rename_sf_find:
  4072                              <1> 	;mov	esi, [DelFile_FNPointer]
  4073 0000A115 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  4074                              <1> 
  4075 0000A11A 66B80008            <1> 	mov	ax, 0800h ; Except volume labels
  4076 0000A11E E84EF3FFFF          <1> 	call	find_first_file
  4077 0000A123 0F8276F7FFFF        <1> 	jc	loc_file_rw_cmd_failed
  4078                              <1> 
  4079                              <1> loc_rename_sf_ambgfn_check:
  4080 0000A129 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  4081                              <1> 	;	(Note: It was BX in TRDOS v1)
  4082                              <1> 	;jz	short loc_rename_sf_found
  4083 0000A12C 0F8571FCFFFF        <1> 	jnz	loc_file_not_found
  4084                              <1> 
  4085                              <1> 	;mov	eax, 2 ; File not found sign
  4086                              <1> 	;stc
  4087                              <1> 	;jmp	loc_file_rw_cmd_failed   
  4088                              <1> 
  4089                              <1> loc_rename_sf_found:
  4090                              <1> 	; EDI = Directory buffer entry offset/address
  4091                              <1> 	; BL = File (or Directory) Attributes 
  4092                              <1> 	;	(Note: It was 'CL' in TRDOS v1)
  4093                              <1> 	; mov	bl, [EDI+0Bh]
  4094                              <1> 
  4095 0000A132 F6C307              <1> 	test	bl, 07h ; Attributes, S-H-R
  4096 0000A135 0F856EF7FFFF        <1> 	jnz	loc_permission_denied
  4097                              <1> 	
  4098 0000A13B BE[F68A0100]        <1>         mov     esi, FindFile_Drv
  4099 0000A140 BF[3C8C0100]        <1>         mov     edi, SourceFile_Drv
  4100 0000A145 B920000000          <1> 	mov	ecx, 32
  4101 0000A14A F3A5                <1> 	rep	movsd
  4102                              <1> 
  4103                              <1> loc_rename_df_parse_path_name:
  4104 0000A14C 8B35[388C0100]      <1> 	mov	esi, [DestinationFilePath]
  4105 0000A152 BF[F68A0100]        <1> 	mov	edi, FindFile_Drv
  4106 0000A157 E8E6140000          <1> 	call	parse_path_name
  4107 0000A15C 7219                <1> 	jc	short loc_rename_df_cmd_failed
  4108                              <1> 
  4109                              <1> 	;mov	dh, [RUN_CDRV]
  4110 0000A15E 8A35[56820100]      <1> 	mov	dh, [Current_Drv]
  4111                              <1> 
  4112                              <1> 	; 'rename' command is valid only for same dos drive and same dir!
  4113                              <1> 	; ('move' command must be used if source file and destination file
  4114                              <1> 	; directories are not same!) 
  4115 0000A164 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
  4116 0000A16A 38F2                <1> 	cmp	dl, dh ; are source and destination drives different ?!
  4117 0000A16C 7509                <1> 	jne	short loc_rename_df_cmd_failed ; yes! 
  4118                              <1> 
  4119                              <1> rename_df_check_dirname_exists:
  4120 0000A16E 803D[F78A0100]00    <1> 	cmp	byte [FindFile_Directory], 0
  4121 0000A175 760B                <1> 	jna	short rename_df_check_filename_exists
  4122                              <1> 
  4123                              <1> 	; different source file and destination file directories !
  4124                              <1> loc_rename_df_cmd_failed:
  4125 0000A177 B801000000          <1> 	mov	eax, 1 ; TRDOS 'Bad command or file name' error
  4126 0000A17C F9                  <1> 	stc
  4127 0000A17D E91DF7FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4128                              <1> 	  
  4129                              <1> rename_df_check_filename_exists:
  4130 0000A182 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  4131 0000A187 E8A3F6FFFF          <1> 	call	check_filename
  4132 0000A18C 0F82BFF7FFFF        <1> 	jc	loc_mkdir_invalid_dir_name_chars
  4133                              <1> 
  4134                              <1> 	;mov	[DelFile_FNPointer], esi 
  4135                              <1> 	;cmp	byte [esi], 20h
  4136                              <1> 	;ja	short loc_rename_df_find
  4137                              <1> 
  4138                              <1> 	;mov	dh, [Current_Drv] ; dh has not been changed
  4139                              <1> 
  4140                              <1> rename_df_drv_check_writable:
  4141 0000A192 0FB6F6              <1> 	movzx	esi, dh
  4142                              <1> 	;movzx	esi, byte [Current_Drv]
  4143 0000A195 81C600010900        <1> 	add	esi, Logical_DOSDisks
  4144                              <1> 
  4145 0000A19B 88F2                <1> 	mov	dl, dh ; dl = [Current_Drv]
  4146 0000A19D 8A7601              <1> 	mov	dh, [esi+LD_DiskType]
  4147                              <1> 
  4148 0000A1A0 80FE01              <1> 	cmp	dh, 1 ; 0 = Invalid
  4149 0000A1A3 7310                <1> 	jnb	short rename_df_compare_sf_df_name
  4150                              <1> 
  4151                              <1> 	; 16/10/2016 (13h -> 30)
  4152 0000A1A5 B81E000000          <1> 	mov	eax, 30 ; 'Disk write-protected' error
  4153 0000A1AA 8B1D[388C0100]      <1> 	mov	ebx, [DestinationFilePath] 
  4154 0000A1B0 E9EAF6FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4155                              <1> 
  4156                              <1> rename_df_compare_sf_df_name:
  4157 0000A1B5 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  4158 0000A1BA BF[7E8C0100]        <1> 	mov	edi, SourceFile_Name
  4159 0000A1BF B90C000000          <1> 	mov	ecx, 12
  4160                              <1> rename_df_compare_sf_df_name_next: 
  4161 0000A1C4 AC                  <1> 	lodsb
  4162 0000A1C5 AE                  <1> 	scasb
  4163 0000A1C6 7506                <1> 	jne	short loc_rename_df_find
  4164 0000A1C8 08C0                <1> 	or	al, al
  4165 0000A1CA 74AB                <1> 	jz	short loc_rename_df_cmd_failed
  4166 0000A1CC E2F6                <1> 	loop	rename_df_compare_sf_df_name_next 
  4167                              <1> 
  4168                              <1> loc_rename_df_find:
  4169                              <1> 	;mov	esi, [DelFile_FNPointer]
  4170 0000A1CE BE[388B0100]        <1> 	mov	esi, FindFile_Name
  4171                              <1> 
  4172 0000A1D3 6631C0              <1> 	xor	ax, ax ; Any
  4173 0000A1D6 E896F2FFFF          <1> 	call	find_first_file
  4174                              <1> 	;jnc	short loc_rename_df_found
  4175                              <1> 	; 29/12/2017
  4176 0000A1DB 0F83C8F6FFFF        <1> 	jnc	loc_permission_denied
  4177                              <1> 
  4178                              <1> loc_rename_df_check_error_code:
  4179                              <1> 	;cmp	eax, 2
  4180 0000A1E1 3C02                <1> 	cmp	al, 2 ; Not found error
  4181 0000A1E3 7406                <1> 	je	short rename_df_move_find_struct_to_dest
  4182 0000A1E5 F9                  <1> 	stc
  4183 0000A1E6 E9B4F6FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4184                              <1> 
  4185                              <1> ;loc_rename_df_found:
  4186                              <1> 	; 05/11/2016
  4187                              <1> 	; Permission denied error
  4188                              <1> 	;mov	eax, ERR_PERM_DENIED ; 29/12/2017
  4189                              <1> 	;stc
  4190                              <1> 	;jmp	loc_permission_denied  ; 06/11/2016
  4191                              <1> 
  4192                              <1> rename_df_move_find_struct_to_dest:
  4193 0000A1EB BE[F68A0100]        <1>         mov     esi, FindFile_Drv
  4194 0000A1F0 BF[BC8C0100]        <1>         mov     edi, DestinationFile_Drv
  4195 0000A1F5 B920000000          <1> 	mov	ecx, 32
  4196 0000A1FA F3A5                <1> 	rep	movsd
  4197                              <1> 
  4198                              <1> loc_rename_df_process_q_sf:
  4199                              <1> 	;mov	ecx, 12
  4200 0000A1FC B10C                <1> 	mov	cl, 12
  4201 0000A1FE BE[7E8C0100]        <1>  	mov	esi, SourceFile_Name
  4202 0000A203 BF[733D0100]        <1> 	mov	edi, Rename_OldName
  4203                              <1> rename_df_process_q_nml_1_sf:
  4204 0000A208 AC                  <1> 	lodsb
  4205 0000A209 3C20                <1>         cmp	al, 20h
  4206 0000A20B 7603                <1>         jna	short rename_df_process_q_nml_2_sf
  4207 0000A20D AA                  <1> 	stosb
  4208 0000A20E E2F8                <1> 	loop	rename_df_process_q_nml_1_sf
  4209                              <1> 
  4210                              <1> rename_df_process_q_nml_2_sf:
  4211 0000A210 C60700              <1> 	mov	byte [edi], 0
  4212                              <1> 
  4213                              <1> loc_rename_df_process_q_df:
  4214                              <1> 	;mov	ecx, 12
  4215 0000A213 B10C                <1> 	mov	cl, 12
  4216 0000A215 BE[FE8C0100]        <1> 	mov	esi, DestinationFile_Name
  4217 0000A21A BF[843D0100]        <1> 	mov	edi, Rename_NewName
  4218                              <1> rename_df_process_q_nml_1_df:
  4219 0000A21F AC                  <1> 	lodsb
  4220 0000A220 3C20                <1> 	cmp	al, 20h
  4221 0000A222 7603                <1> 	jna	short loc_rename_df_process_q_nml_2_df
  4222 0000A224 AA                  <1> 	stosb
  4223 0000A225 E2F8                <1> 	loop	rename_df_process_q_nml_1_df
  4224                              <1> 
  4225                              <1> loc_rename_df_process_q_nml_2_df:
  4226 0000A227 C60700              <1> 	mov	byte [edi], 0
  4227                              <1> 
  4228                              <1> loc_rename_confirmation_question:
  4229 0000A22A BE[4B3D0100]        <1> 	mov	esi, Msg_DoYouWantRename
  4230 0000A22F E811D3FFFF          <1> 	call	print_msg
  4231                              <1> 
  4232 0000A234 A0[998C0100]        <1> 	mov	al, [SourceFile_DirEntry+11] ; Attributes
  4233 0000A239 2410                <1> 	and	al, 10h
  4234 0000A23B 750C                <1> 	jnz	short rename_confirmation_question_dir
  4235                              <1> 
  4236                              <1> rename_confirmation_question_file:
  4237 0000A23D BE[623D0100]        <1> 	mov	esi, Rename_File
  4238 0000A242 E8FED2FFFF          <1> 	call	print_msg 
  4239 0000A247 EB0A                <1> 	jmp	short rename_confirmation_question_as 
  4240                              <1> 
  4241                              <1> rename_confirmation_question_dir:
  4242 0000A249 BE[683D0100]        <1> 	mov	esi, Rename_Directory
  4243 0000A24E E8F2D2FFFF          <1> 	call	print_msg
  4244                              <1> 
  4245                              <1> rename_confirmation_question_as:
  4246 0000A253 BE[733D0100]        <1> 	mov	esi, Rename_OldName
  4247 0000A258 E8E8D2FFFF          <1> 	call	print_msg
  4248 0000A25D BE[803D0100]        <1> 	mov	esi, Msg_File_rename_as
  4249 0000A262 E8DED2FFFF          <1> 	call	print_msg
  4250 0000A267 BE[A73C0100]        <1> 	mov	esi, Msg_YesNo
  4251 0000A26C E8D4D2FFFF          <1> 	call	print_msg
  4252                              <1> 
  4253                              <1> loc_rename_ask_again:
  4254 0000A271 30E4                <1> 	xor	ah, ah
  4255 0000A273 E86D6CFFFF          <1> 	call	int16h
  4256 0000A278 3C1B                <1> 	cmp	al, 1Bh
  4257 0000A27A 740F                <1> 	je	short loc_do_not_rename_file
  4258 0000A27C 24DF                <1> 	and	al, 0DFh
  4259 0000A27E A2[B13C0100]        <1> 	mov	[Y_N_nextline], al
  4260 0000A283 3C59                <1> 	cmp	al, 'Y'
  4261 0000A285 7404                <1> 	je	short loc_yes_rename_file
  4262 0000A287 3C4E                <1> 	cmp	al, 'N'
  4263 0000A289 75E6                <1> 	jne	short loc_rename_ask_again
  4264                              <1> 
  4265                              <1> loc_do_not_rename_file:
  4266                              <1> loc_yes_rename_file:
  4267 0000A28B E848F7FFFF          <1> 	call	y_n_answer ; 29/12/2017
  4268                              <1> 	;cmp	al, 'Y' ; 'yes'
  4269                              <1> 	;cmc
  4270                              <1>         ;jnc	loc_file_rw_restore_retn
  4271 0000A290 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4272 0000A292 0F8407F6FFFF        <1>         je	loc_file_rw_restore_retn  
  4273                              <1> 
  4274 0000A298 BE[843D0100]        <1> 	mov	esi, Rename_NewName
  4275 0000A29D 668B0D[B68C0100]    <1> 	mov	cx, [SourceFile_DirEntryNumber] 
  4276 0000A2A4 66A1[A28C0100]      <1> 	mov	ax, [SourceFile_DirEntry+20] ; First Cluster, HW 
  4277 0000A2AA C1E010              <1> 	shl	eax, 16 ; 13/11/2017
  4278 0000A2AD 66A1[A88C0100]      <1> 	mov	ax, [SourceFile_DirEntry+26] ; First Cluster, LW 
  4279                              <1> 
  4280 0000A2B3 0FB61D[8B8C0100]    <1>   	movzx	ebx, byte [SourceFile_LongNameEntryLength]  
  4281 0000A2BA E8CB1B0000          <1>    	call	rename_directory_entry
  4282 0000A2BF E9FBF6FFFF          <1> 	jmp	loc_rename_file_ok	
  4283                              <1> ;loc_rename_file_ok:
  4284                              <1> ;	jc	loc_run_cmd_failed
  4285                              <1> ;	mov	esi, Msg_OK
  4286                              <1> ;	call	proc_printmsg
  4287                              <1> ;	jmp	loc_file_rw_restore_retn
  4288                              <1> 
  4289                              <1> move_file:
  4290                              <1> 	; 11/03/2016
  4291                              <1> 	; 09/03/2016
  4292                              <1> 	; 08/03/2016 (TRDOS 386 = TRDOS v2.0)
  4293                              <1> 	; 21/05/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_move')
  4294                              <1> 	; 23/04/2011
  4295                              <1> 
  4296                              <1> get_move_source_fchar:
  4297                              <1> 	; esi = file name
  4298 0000A2C4 803E20              <1> 	cmp	byte [esi], 20h
  4299 0000A2C7 7614                <1>         jna	short loc_move_nofilename_retn
  4300                              <1> 
  4301 0000A2C9 8935[348C0100]      <1> 	mov	[SourceFilePath], esi
  4302                              <1> 
  4303                              <1> move_scan_source_file:
  4304 0000A2CF 46                  <1> 	inc	esi
  4305 0000A2D0 803E20              <1> 	cmp	byte [esi], 20h
  4306 0000A2D3 7409                <1>         je      short move_scan_destination_1
  4307                              <1> 	;jb	short loc_move_nofilename_retn
  4308 0000A2D5 0F8286ECFFFF        <1> 	jb	loc_cmd_failed
  4309 0000A2DB EBF2                <1> 	jmp	short move_scan_source_file
  4310                              <1> 
  4311                              <1> loc_move_nofilename_retn:
  4312 0000A2DD C3                  <1> 	retn
  4313                              <1> 
  4314                              <1> move_scan_destination_1:
  4315 0000A2DE C60600              <1> 	mov	byte [esi], 0
  4316                              <1> 
  4317                              <1> move_scan_destination_2:
  4318 0000A2E1 46                  <1> 	inc	esi  
  4319 0000A2E2 803E20              <1> 	cmp	byte [esi], 20h
  4320 0000A2E5 74FA                <1> 	je	short move_scan_destination_2
  4321                              <1> 	;jb	short loc_move_nofilename_retn
  4322 0000A2E7 0F8274ECFFFF        <1> 	jb	loc_cmd_failed
  4323                              <1> 
  4324 0000A2ED 8935[388C0100]      <1> 	mov	[DestinationFilePath], esi
  4325                              <1> 
  4326                              <1> move_scan_destination_3:
  4327 0000A2F3 46                  <1> 	inc	esi  
  4328 0000A2F4 803E20              <1> 	cmp	byte [esi], 20h
  4329 0000A2F7 77FA                <1> 	ja	short move_scan_destination_3
  4330 0000A2F9 C60600              <1> 	mov	byte [esi], 0
  4331                              <1> 
  4332                              <1> loc_move_scan_destination_OK:
  4333 0000A2FC 8B35[348C0100]      <1> 	mov	esi, [SourceFilePath]
  4334 0000A302 8B3D[388C0100]      <1> 	mov	edi, [DestinationFilePath]
  4335                              <1> 
  4336 0000A308 B001                <1> 	mov	al, 1  ; move procedure Phase 1
  4337 0000A30A E8F71B0000          <1> 	call	move_source_file_to_destination_file
  4338 0000A30F 7328                <1> 	jnc	short move_source_file_to_destination_question
  4339                              <1> 
  4340                              <1> loc_move_cmd_failed_1:
  4341 0000A311 08C0                <1> 	or	al, al
  4342 0000A313 0F8448ECFFFF        <1> 	jz	loc_cmd_failed 
  4343 0000A319 3C11                <1> 	cmp	al, 11h
  4344 0000A31B 740D                <1> 	je	short loc_msg_not_same_device   
  4345                              <1> 	;cmp	al, 05h
  4346                              <1> 	;cmp	al, ERR_PERM_DENIED ; 29/12/2017
  4347                              <1> 	;jne	loc_run_cmd_failed
  4348                              <1> 	;jmp	loc_permission_denied
  4349 0000A31D 3C0B                <1> 	cmp	al, ERR_PERM_DENIED
  4350 0000A31F 0F8484F5FFFF        <1> 	je	loc_permission_denied
  4351 0000A325 E962ECFFFF          <1> 	jmp	loc_run_cmd_failed
  4352                              <1> 
  4353                              <1> 	;mov	esi, Msg_Permission_denied
  4354                              <1> 	;call	print_msg
  4355                              <1> 	;jmp	loc_file_rw_restore_retn
  4356                              <1> 
  4357                              <1> loc_msg_not_same_device:
  4358 0000A32A BE[913D0100]        <1> 	mov	esi, msg_not_same_drv 
  4359 0000A32F E811D2FFFF          <1> 	call	print_msg
  4360 0000A334 E966F5FFFF          <1> 	jmp	loc_file_rw_restore_retn
  4361                              <1> 
  4362                              <1> move_source_file_to_destination_question:
  4363 0000A339 A0[3C8C0100]        <1>         mov     al, [SourceFile_Drv]
  4364 0000A33E 0441                <1> 	add	al, 'A'
  4365 0000A340 A2[F33D0100]        <1> 	mov	[msg_source_file_drv], al
  4366 0000A345 A0[BC8C0100]        <1>         mov     al, [DestinationFile_Drv]
  4367 0000A34A 0441                <1> 	add	al, 'A'
  4368 0000A34C A2[123E0100]        <1> 	mov	[msg_destination_file_drv], al
  4369                              <1> 
  4370 0000A351 57                  <1> 	push	edi ; *
  4371                              <1> 
  4372 0000A352 BE[D73D0100]        <1> 	mov	esi, msg_source_file
  4373 0000A357 E8E9D1FFFF          <1> 	call	print_msg
  4374 0000A35C BE[3D8C0100]        <1> 	mov	esi, SourceFile_Directory
  4375 0000A361 803E20              <1> 	cmp	byte [esi], 20h
  4376 0000A364 7605                <1> 	jna	short msftdfq_sfn
  4377 0000A366 E8DAD1FFFF          <1> 	call	print_msg
  4378                              <1> msftdfq_sfn:
  4379 0000A36B BE[7E8C0100]        <1> 	mov	esi, SourceFile_Name
  4380 0000A370 E8D0D1FFFF          <1> 	call	print_msg
  4381 0000A375 BE[F63D0100]        <1> 	mov	esi, msg_destination_file
  4382 0000A37A E8C6D1FFFF          <1> 	call	print_msg
  4383 0000A37F BE[BD8C0100]        <1> 	mov	esi, DestinationFile_Directory
  4384 0000A384 803E20              <1> 	cmp	byte [esi], 20h
  4385 0000A387 7605                <1> 	jna	short msftdfq_dfn
  4386 0000A389 E8B7D1FFFF          <1> 	call	print_msg
  4387                              <1> msftdfq_dfn:
  4388 0000A38E BE[FE8C0100]        <1> 	mov	esi, DestinationFile_Name
  4389 0000A393 E8ADD1FFFF          <1> 	call	print_msg
  4390 0000A398 BE[153E0100]        <1> 	mov	esi, msg_copy_nextline
  4391 0000A39D E8A3D1FFFF          <1> 	call	print_msg
  4392 0000A3A2 BE[153E0100]        <1> 	mov	esi, msg_copy_nextline
  4393 0000A3A7 E899D1FFFF          <1> 	call	print_msg
  4394                              <1> 
  4395                              <1> loc_move_ask_for_new_file_yes_no:
  4396 0000A3AC BE[A33D0100]        <1> 	mov	esi, Msg_DoYouWantMoveFile
  4397 0000A3B1 E88FD1FFFF          <1> 	call	print_msg
  4398 0000A3B6 BE[A73C0100]        <1> 	mov	esi, Msg_YesNo
  4399 0000A3BB E885D1FFFF          <1> 	call	print_msg
  4400                              <1> loc_move_ask_for_new_file_again:
  4401 0000A3C0 30E4                <1> 	xor	ah, ah
  4402 0000A3C2 E81E6BFFFF          <1> 	call	int16h
  4403 0000A3C7 3C1B                <1> 	cmp	al, 1Bh
  4404                              <1> 	;je	short loc_do_not_move_file
  4405 0000A3C9 7441                <1> 	je	short loc_move_y_n_escape
  4406 0000A3CB 24DF                <1> 	and	al, 0DFh
  4407 0000A3CD A2[B13C0100]        <1>         mov     [Y_N_nextline], al
  4408 0000A3D2 3C59                <1> 	cmp	al, 'Y'
  4409 0000A3D4 7404                <1> 	je	short loc_yes_move_file
  4410 0000A3D6 3C4E                <1> 	cmp	al, 'N'
  4411 0000A3D8 75E6                <1> 	jne	short loc_move_ask_for_new_file_again
  4412                              <1> 
  4413                              <1> loc_do_not_move_file:
  4414                              <1> loc_yes_move_file:
  4415 0000A3DA E8F9F5FFFF          <1> 	call	y_n_answer ; 29/12/2017
  4416 0000A3DF 5F                  <1> 	pop	edi ; *
  4417                              <1> 	;cmp	al, 'Y' ; 'yes'
  4418                              <1> 	;cmc
  4419                              <1>         ;jnc	loc_file_rw_restore_retn
  4420 0000A3E0 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4421 0000A3E2 0F84B7F4FFFF        <1>         je	loc_file_rw_restore_retn
  4422                              <1> 
  4423                              <1> loc_move_yes_move_file:
  4424 0000A3E8 B002                <1> 	mov	al, 2 ; move procedure Phase 2
  4425 0000A3EA E8171B0000          <1> 	call	move_source_file_to_destination_file
  4426                              <1> 	;jc	short loc_move_cmd_failed_2
  4427 0000A3EF 0F83D0F5FFFF        <1>         jnc     move_source_file_to_destination_OK
  4428                              <1> 
  4429                              <1> ;move_source_file_to_destination_OK:
  4430                              <1> ;	mov	esi, Msg_OK
  4431                              <1> ;	call	print_msg
  4432                              <1> ;	jmp	loc_file_rw_restore_retn
  4433                              <1> 
  4434                              <1> loc_move_cmd_failed_2:
  4435 0000A3F5 3C27                <1> 	cmp	al, 27h
  4436 0000A3F7 0F858FEBFFFF        <1> 	jne	loc_run_cmd_failed
  4437                              <1> 
  4438 0000A3FD BE[BC3D0100]        <1> 	mov	esi, msg_insufficient_disk_space
  4439 0000A402 E83ED1FFFF          <1> 	call	print_msg
  4440                              <1> 
  4441 0000A407 E993F4FFFF          <1> 	jmp	loc_file_rw_restore_retn
  4442                              <1> 
  4443                              <1> loc_move_y_n_escape:
  4444 0000A40C B04E                <1> 	mov	al, 'N' ; 'no'
  4445 0000A40E EBCA                <1> 	jmp	short loc_do_not_move_file
  4446                              <1> 
  4447                              <1> copy_file:
  4448                              <1> 	; 15/10/2016
  4449                              <1> 	; 24/03/2016
  4450                              <1> 	; 21/03/2016
  4451                              <1> 	; 15/03/2016 (TRDOS 386 = TRDOS v2.0)
  4452                              <1> 	; 21/05/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_copy')
  4453                              <1> 	; 01/08/2010
  4454                              <1> 
  4455                              <1> get_copy_source_fchar:
  4456                              <1> 	; esi = file name
  4457 0000A410 803E20              <1> 	cmp	byte [esi], 20h
  4458 0000A413 7614                <1>         jna     short loc_copy_nofilename_retn
  4459                              <1> 
  4460 0000A415 8935[348C0100]      <1> 	mov	[SourceFilePath], esi
  4461                              <1> 
  4462                              <1> copy_scan_source_file:
  4463 0000A41B 46                  <1> 	inc	esi  
  4464 0000A41C 803E20              <1> 	cmp	byte [esi], 20h
  4465 0000A41F 7409                <1> 	je	short copy_scan_destination_1
  4466                              <1> 	;jb	short loc_copy_nofilename_retn
  4467 0000A421 0F823AEBFFFF        <1> 	jb	loc_cmd_failed
  4468 0000A427 EBF2                <1> 	jmp	short copy_scan_source_file
  4469                              <1> 
  4470                              <1> loc_copy_nofilename_retn:
  4471 0000A429 C3                  <1> 	retn
  4472                              <1> 
  4473                              <1> copy_scan_destination_1:
  4474 0000A42A C60600              <1> 	mov	byte [esi], 0
  4475                              <1> 
  4476                              <1> copy_scan_destination_2:
  4477 0000A42D 46                  <1> 	inc	esi  
  4478 0000A42E 803E20              <1> 	cmp	byte [esi], 20h
  4479 0000A431 74FA                <1> 	je	short copy_scan_destination_2
  4480                              <1> 	;jb	short loc_copy_nofilename_retn
  4481 0000A433 0F8228EBFFFF        <1> 	jb	loc_cmd_failed
  4482                              <1> 
  4483 0000A439 8935[388C0100]      <1> 	mov	[DestinationFilePath], esi
  4484                              <1> 
  4485                              <1> copy_scan_destination_3:
  4486 0000A43F 46                  <1> 	inc	esi  
  4487 0000A440 803E20              <1> 	cmp	byte [esi], 20h
  4488 0000A443 77FA                <1> 	ja	short copy_scan_destination_3
  4489 0000A445 C60600              <1> 	mov	byte [esi], 0
  4490                              <1> 
  4491                              <1> loc_copy_save_current_drive:
  4492 0000A448 8A35[56820100]      <1> 	mov	dh, [Current_Drv]
  4493 0000A44E 8835[B2890100]      <1> 	mov	[RUN_CDRV], dh
  4494                              <1> 
  4495                              <1> copy_source_file_to_destination_phase_1:
  4496 0000A454 8B35[348C0100]      <1> 	mov	esi, [SourceFilePath]
  4497 0000A45A 8B3D[388C0100]      <1> 	mov	edi, [DestinationFilePath]
  4498                              <1> 
  4499 0000A460 B001                <1> 	mov	al, 1  ; copy procedure Phase 1
  4500 0000A462 E83C1D0000          <1> 	call	copy_source_file_to_destination_file
  4501 0000A467 732B                <1> 	jnc	short copy_source_file_to_destination_question
  4502                              <1> 
  4503                              <1> loc_copy_cmd_failed_1:
  4504                              <1> 	; 18/03/2016 (restore current drive and directory)
  4505 0000A469 08C0                <1> 	or	al, al
  4506 0000A46B 7507                <1> 	jnz	short loc_copy_cmd_failed_2
  4507                              <1> 
  4508 0000A46D FEC0                <1>         inc     al ; mov al, 1 ; Bad command or file name !
  4509 0000A46F E918EBFFFF          <1> 	jmp	loc_run_cmd_failed
  4510                              <1> 
  4511                              <1> loc_copy_cmd_failed_2:
  4512 0000A474 3C27                <1> 	cmp	al, 27h ; Insufficient disk space 
  4513 0000A476 740D                <1> 	je	short loc_file_write_insuff_disk_space_msg
  4514                              <1>  
  4515                              <1> 	; 29/12/2017
  4516                              <1> 	;cmp	al, 05h
  4517 0000A478 3C0B                <1> 	cmp	al, ERR_PERM_DENIED
  4518 0000A47A 0F850CEBFFFF        <1> 	jne	loc_run_cmd_failed
  4519                              <1> 	
  4520 0000A480 E924F4FFFF          <1> 	jmp	loc_permission_denied
  4521                              <1> 
  4522                              <1> loc_file_write_insuff_disk_space_msg:
  4523 0000A485 BE[BC3D0100]        <1> 	mov	esi, msg_insufficient_disk_space
  4524 0000A48A E8B6D0FFFF          <1> 	call	print_msg
  4525 0000A48F E90BF4FFFF          <1>         jmp     loc_file_rw_restore_retn 
  4526                              <1> 
  4527                              <1> copy_source_file_to_destination_question:
  4528 0000A494 57                  <1> 	push	edi ; *
  4529                              <1> 
  4530                              <1> 	; dh = source file attributes
  4531                              <1> 	; dl > 0 -> destination file found
  4532 0000A495 20D2                <1> 	and	dl, dl            
  4533 0000A497 7449                <1> 	jz	short copy_source_file_to_destination_pass_owrq
  4534                              <1> 
  4535                              <1> loc_copy_ask_for_owr_yes_no:
  4536 0000A499 BE[183E0100]        <1> 	mov	esi, Msg_DoYouWantOverWriteFile
  4537 0000A49E E8A2D0FFFF          <1> 	call	print_msg
  4538 0000A4A3 BE[FE8C0100]        <1> 	mov	esi, DestinationFile_Name
  4539 0000A4A8 E898D0FFFF          <1> 	call	print_msg
  4540 0000A4AD BE[A73C0100]        <1> 	mov	esi, Msg_YesNo
  4541 0000A4B2 E88ED0FFFF          <1> 	call	print_msg
  4542                              <1> 
  4543                              <1> loc_copy_ask_for_owr_again:
  4544 0000A4B7 30E4                <1> 	xor	ah, ah
  4545 0000A4B9 E8276AFFFF          <1> 	call	int16h
  4546 0000A4BE 3C1B                <1> 	cmp	al, 1Bh
  4547                              <1>         ;je     loc_do_not_copy_file
  4548 0000A4C0 7419                <1>         je      short loc_copy_y_n_escape
  4549 0000A4C2 24DF                <1> 	and	al, 0DFh
  4550 0000A4C4 A2[B13C0100]        <1>         mov     [Y_N_nextline], al
  4551 0000A4C9 3C59                <1> 	cmp	al, 'Y'
  4552 0000A4CB 0F84B1000000        <1>         je      loc_yes_copy_file
  4553 0000A4D1 3C4E                <1> 	cmp	al, 'N'
  4554 0000A4D3 0F84A9000000        <1>         je      loc_do_not_copy_file
  4555 0000A4D9 EBDC                <1> 	jmp	short loc_copy_ask_for_owr_again
  4556                              <1> 
  4557                              <1> loc_copy_y_n_escape:
  4558 0000A4DB B04E                <1> 	mov	al, 'N' ; 'no'
  4559 0000A4DD E9A0000000          <1>         jmp     loc_do_not_copy_file
  4560                              <1> 
  4561                              <1> copy_source_file_to_destination_pass_owrq:
  4562 0000A4E2 A0[3C8C0100]        <1> 	mov     al, [SourceFile_Drv]
  4563 0000A4E7 0441                <1> 	add	al, 'A'
  4564 0000A4E9 A2[F33D0100]        <1> 	mov	[msg_source_file_drv], al
  4565 0000A4EE A0[BC8C0100]        <1>         mov     al, [DestinationFile_Drv]
  4566 0000A4F3 0441                <1> 	add	al, 'A'
  4567 0000A4F5 A2[123E0100]        <1> 	mov	[msg_destination_file_drv], al
  4568                              <1> 
  4569 0000A4FA BE[D73D0100]        <1> 	mov	esi, msg_source_file
  4570 0000A4FF E841D0FFFF          <1> 	call	print_msg
  4571 0000A504 BE[3D8C0100]        <1> 	mov	esi, SourceFile_Directory
  4572 0000A509 803E20              <1> 	cmp	byte [esi], 20h
  4573 0000A50C 7605                <1> 	jna	short csftdfq_sfn
  4574 0000A50E E832D0FFFF          <1> 	call	print_msg
  4575                              <1> csftdfq_sfn:
  4576 0000A513 BE[7E8C0100]        <1> 	mov	esi, SourceFile_Name
  4577 0000A518 E828D0FFFF          <1> 	call	print_msg
  4578 0000A51D BE[F63D0100]        <1> 	mov	esi, msg_destination_file
  4579 0000A522 E81ED0FFFF          <1> 	call	print_msg
  4580 0000A527 BE[BD8C0100]        <1> 	mov	esi, DestinationFile_Directory
  4581 0000A52C 803E20              <1> 	cmp	byte [esi], 20h
  4582 0000A52F 7605                <1> 	jna	short csftdfq_dfn
  4583 0000A531 E80FD0FFFF          <1> 	call	print_msg
  4584                              <1> csftdfq_dfn:
  4585 0000A536 BE[FE8C0100]        <1> 	mov	esi, DestinationFile_Name
  4586 0000A53B E805D0FFFF          <1> 	call	print_msg
  4587 0000A540 BE[153E0100]        <1> 	mov	esi, msg_copy_nextline
  4588 0000A545 E8FBCFFFFF          <1> 	call	print_msg
  4589 0000A54A BE[153E0100]        <1> 	mov	esi, msg_copy_nextline
  4590 0000A54F E8F1CFFFFF          <1> 	call	print_msg
  4591                              <1> 
  4592                              <1> loc_copy_ask_for_new_file_yes_no:
  4593 0000A554 BE[373E0100]        <1> 	mov	esi, Msg_DoYouWantCopyFile
  4594 0000A559 E8E7CFFFFF          <1> 	call	print_msg
  4595 0000A55E BE[A73C0100]        <1> 	mov	esi, Msg_YesNo
  4596 0000A563 E8DDCFFFFF          <1> 	call	print_msg
  4597                              <1> 
  4598                              <1> loc_copy_ask_for_new_file_again:
  4599 0000A568 30E4                <1> 	xor	ah, ah
  4600 0000A56A E87669FFFF          <1> 	call	int16h
  4601 0000A56F 3C1B                <1> 	cmp	al, 1Bh
  4602 0000A571 740F                <1> 	je	short loc_do_not_copy_file
  4603 0000A573 24DF                <1> 	and	al, 0DFh
  4604 0000A575 A2[B13C0100]        <1>         mov     [Y_N_nextline], al
  4605 0000A57A 3C59                <1> 	cmp	al, 'Y'
  4606 0000A57C 7404                <1> 	je	short loc_yes_copy_file
  4607 0000A57E 3C4E                <1> 	cmp	al, 'N'
  4608 0000A580 75E6                <1> 	jne	short loc_copy_ask_for_new_file_again
  4609                              <1> 
  4610                              <1> loc_do_not_copy_file:
  4611                              <1> loc_yes_copy_file:
  4612 0000A582 E851F4FFFF          <1> 	call	y_n_answer ; 29/12/2017
  4613 0000A587 5F                  <1> 	pop	edi ; *
  4614                              <1> 	;cmp	al, 'Y' ; 'yes'
  4615                              <1> 	;cmc
  4616                              <1>         ;jnc	loc_file_rw_restore_retn
  4617 0000A588 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4618 0000A58A 0F840FF3FFFF        <1>         je	loc_file_rw_restore_retn
  4619                              <1> 
  4620                              <1> copy_source_file_to_destination_pass_q:
  4621 0000A590 B002                <1> 	mov	al, 2  ; copy procedure Phase 2
  4622 0000A592 E80C1C0000          <1> 	call	copy_source_file_to_destination_file
  4623                              <1> 	;jc	short loc_file_write_check_disk_space_err
  4624                              <1> 
  4625                              <1> 	; 24/03/2016
  4626                              <1> 	;push	cx
  4627 0000A597 51                  <1> 	push	ecx ; 29/12/2017
  4628 0000A598 BE[153E0100]        <1> 	mov	esi, msg_copy_nextline
  4629 0000A59D E8A3CFFFFF          <1> 	call	print_msg
  4630 0000A5A2 58                  <1> 	pop	eax ; 29/12/2017
  4631                              <1> 	;;pop	cx
  4632                              <1> 	;pop	ax
  4633                              <1> 
  4634                              <1> 	;or	cl, cl
  4635 0000A5A3 08C0                <1> 	or	al, al
  4636 0000A5A5 7419                <1> 	jz	short copy_source_file_to_destination_OK
  4637                              <1> 	
  4638                              <1> 	; 15/10/2016 (1Dh -> 18)
  4639                              <1> 	; 18/03/2016 (1Dh)
  4640                              <1> 	;cmp	cl, 18 ; write error
  4641 0000A5A7 3C12                <1> 	cmp	al, 18
  4642 0000A5A9 7506                <1> 	jne	short copy_source_file_to_destination_not_OK
  4643                              <1> 	;
  4644                              <1> 	;mov	al, cl ; error number (write fault!)
  4645 0000A5AB F9                  <1> 	stc
  4646 0000A5AC E9EEF2FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4647                              <1> 
  4648                              <1> copy_source_file_to_destination_not_OK:
  4649 0000A5B1 BE[503E0100]        <1> 	mov	esi, Msg_read_file_error_before_EOF
  4650 0000A5B6 E88ACFFFFF          <1> 	call	print_msg
  4651 0000A5BB E9DFF2FFFF          <1> 	jmp	loc_file_rw_restore_retn	      
  4652                              <1>  
  4653                              <1> copy_source_file_to_destination_OK:
  4654 0000A5C0 BE[B53C0100]        <1> 	mov	esi, Msg_OK
  4655 0000A5C5 E87BCFFFFF          <1> 	call	print_msg
  4656                              <1> 
  4657 0000A5CA E9D0F2FFFF          <1> 	jmp	loc_file_rw_restore_retn
  4658                              <1> 
  4659                              <1> ;loc_file_write_check_disk_space_err:
  4660                              <1> 	;cmp	al, 27h ; Insufficient disk space 
  4661                              <1> 	;je	loc_file_write_insuff_disk_space_msg
  4662                              <1>         ;jb	loc_file_rw_cmd_failed
  4663                              <1> 
  4664                              <1> 	;call	print_misc_error_msg ; 15/03/2016
  4665                              <1>         ;jmp	loc_file_rw_restore_retn 
  4666                              <1> 
  4667                              <1> change_fs_file_attributes:
  4668                              <1> 	; 04/03/2016 ; Temporary
  4669                              <1> 	; AL = File or directory attributes
  4670                              <1> 	; AH = 0 -> Attributes are in MS-DOS format
  4671                              <1> 	; AH > 0 -> Attributes are in SINGLIX format
  4672                              <1> 	;push	ebx
  4673                              <1> 	; ... do somethings here ...
  4674                              <1> 	;pop	ebx
  4675                              <1> 	; BL = File or directory attributes
  4676 0000A5CF C3                  <1> 	retn
  4677                              <1> 
  4678                              <1> set_get_env:
  4679                              <1> 	; 11/04/2016 (TRDOS 386 = TRDOS v2.0)
  4680                              <1> 	; 02/09/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_set')
  4681                              <1> 	; 2005 - 28/08/2011 
  4682                              <1> get_setenv_fchar:
  4683                              <1> 	; esi = environment variable/string
  4684 0000A5D0 8A06                <1> 	mov	al, [esi]
  4685 0000A5D2 3C20                <1> 	cmp	al, 20h
  4686 0000A5D4 771E                <1> 	ja	short loc_find_env
  4687                              <1> 
  4688 0000A5D6 BE00300900          <1> 	mov	esi, Env_Page
  4689                              <1> loc_print_setline:
  4690 0000A5DB 803E00              <1> 	cmp	byte [esi], 0
  4691 0000A5DE 7613                <1> 	jna	short loc_setenv_retn
  4692 0000A5E0 E860CFFFFF          <1> 	call	print_msg
  4693 0000A5E5 56                  <1> 	push	esi
  4694 0000A5E6 BE[BF440100]        <1> 	mov	esi, nextline
  4695 0000A5EB E855CFFFFF          <1> 	call	print_msg 
  4696 0000A5F0 5E                  <1> 	pop	esi
  4697 0000A5F1 EBE8                <1> 	jmp	short loc_print_setline   
  4698                              <1> 
  4699                              <1> loc_setenv_retn: 
  4700 0000A5F3 C3                  <1> 	retn
  4701                              <1> 
  4702                              <1> loc_find_env:
  4703 0000A5F4 3C3D                <1> 	cmp	al, '='
  4704 0000A5F6 0F8465E9FFFF        <1> 	je	loc_cmd_failed
  4705                              <1> 
  4706 0000A5FC 56                  <1> 	push	esi
  4707                              <1> loc_repeat_env_equal_check:
  4708 0000A5FD 46                  <1> 	inc	esi
  4709 0000A5FE 803E3D              <1> 	cmp	byte [esi], '='
  4710 0000A601 7431                <1> 	je	short pass_env_equal_check
  4711 0000A603 803E20              <1> 	cmp	byte [esi], 20h
  4712 0000A606 73F5                <1> 	jnb	short loc_repeat_env_equal_check
  4713 0000A608 C60600              <1> 	mov	byte [esi], 0 
  4714 0000A60B 5E                  <1> 	pop	esi
  4715 0000A60C BF[56830100]        <1> 	mov	edi, TextBuffer ; out buffer
  4716 0000A611 B9FF000000          <1> 	mov	ecx, 255 ; maximum size (limit)
  4717 0000A616 30C0                <1> 	xor	al, al ; 0 -> use [ESI]
  4718 0000A618 E89E000000          <1> 	call	get_environment_string
  4719 0000A61D 72D4                <1> 	jc	short loc_setenv_retn
  4720                              <1> 
  4721 0000A61F BE[56830100]        <1> 	mov	esi, TextBuffer
  4722 0000A624 E81CCFFFFF          <1> 	call	print_msg
  4723 0000A629 BE[BF440100]        <1> 	mov	esi, nextline
  4724 0000A62E E812CFFFFF          <1> 	call	print_msg
  4725                              <1> 
  4726 0000A633 C3                  <1> 	retn 
  4727                              <1>               
  4728                              <1> pass_env_equal_check:
  4729 0000A634 46                  <1> 	inc	esi
  4730 0000A635 803E20              <1> 	cmp	byte [esi], 20h
  4731 0000A638 73FA                <1> 	jnb	short pass_env_equal_check
  4732 0000A63A C60600              <1> 	mov	byte [esi], 0	
  4733                              <1> 
  4734                              <1> loc_call_set_env_string:
  4735 0000A63D 5E                  <1> 	pop	esi
  4736 0000A63E E83B010000          <1> 	call	set_environment_string
  4737 0000A643 73AE                <1> 	jnc	short loc_setenv_retn
  4738                              <1> 
  4739                              <1> loc_set_cmd_failed:
  4740 0000A645 3C08                <1> 	cmp	al, 08h
  4741 0000A647 0F8514E9FFFF        <1> 	jne	loc_cmd_failed
  4742                              <1> 
  4743 0000A64D BE[903E0100]        <1> 	mov	esi, Msg_No_Set_Space
  4744 0000A652 E8EECEFFFF          <1> 	call	print_msg
  4745                              <1> 
  4746 0000A657 C3                  <1> 	retn
  4747                              <1> 
  4748                              <1> set_get_path:
  4749                              <1> 	; 11/04/2016 (TRDOS 386 = TRDOS v2.0)
  4750                              <1> 	; 03/09/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_path')
  4751                              <1> 	; 2005
  4752                              <1> get_path_fchar:
  4753                              <1>  	; esi = path
  4754 0000A658 803E20              <1> 	cmp	byte [esi], 20h
  4755 0000A65B 7737                <1> 	ja	short loc_set_path
  4756                              <1> 
  4757 0000A65D BE00300900          <1> 	mov	esi, Env_Page
  4758                              <1> loc_print_path:
  4759 0000A662 803E00              <1> 	cmp	byte [esi], 0
  4760 0000A665 762C                <1> 	jna	short loc_path_retn
  4761                              <1> 
  4762 0000A667 BE[EF380100]        <1> 	mov	esi, Cmd_Path ; 'PATH' address
  4763 0000A66C BF[56830100]        <1> 	mov	edi, TextBuffer ; out buffer
  4764 0000A671 30C0                <1> 	xor	al, al  ; use [ESI]
  4765 0000A673 B9FF000000          <1> 	mov	ecx, 255 ; maximum size (limit)
  4766 0000A678 E83E000000          <1> 	call	get_environment_string
  4767 0000A67D 7214                <1> 	jc	short loc_path_retn
  4768                              <1> 
  4769 0000A67F BE[56830100]        <1> 	mov	esi, TextBuffer
  4770 0000A684 E8BCCEFFFF          <1> 	call	print_msg
  4771 0000A689 BE[BF440100]        <1> 	mov	esi, nextline
  4772 0000A68E E8B2CEFFFF          <1> 	call	print_msg   
  4773                              <1> 
  4774                              <1> loc_path_retn: 
  4775 0000A693 C3                  <1> 	retn
  4776                              <1> 
  4777                              <1> loc_set_path:
  4778 0000A694 56                  <1> 	push	esi 
  4779                              <1> loc_set_path_find_end:
  4780 0000A695 46                  <1> 	inc	esi
  4781 0000A696 803E20              <1> 	cmp	byte [esi], 20h
  4782 0000A699 73FA                <1> 	jnb	short loc_set_path_find_end
  4783 0000A69B C60600              <1> 	mov	byte [esi], 0 
  4784                              <1> loc_set_path_header: 
  4785 0000A69E 5E                  <1> 	pop	esi
  4786                              <1> set_path_x: ; 31/12/2017 ('syspath')	  
  4787 0000A69F 4E                  <1> 	dec	esi
  4788 0000A6A0 C6063D              <1> 	mov	byte [esi], '='
  4789 0000A6A3 4E                  <1> 	dec	esi
  4790 0000A6A4 C60648              <1> 	mov	byte [esi], 'H'
  4791 0000A6A7 4E                  <1> 	dec	esi
  4792 0000A6A8 C60654              <1> 	mov	byte [esi], 'T'
  4793 0000A6AB 4E                  <1> 	dec	esi
  4794 0000A6AC C60641              <1> 	mov	byte [esi], 'A'
  4795 0000A6AF 4E                  <1> 	dec	esi
  4796 0000A6B0 C60650              <1> 	mov	byte [esi], 'P'   
  4797                              <1> 
  4798                              <1> loc_path_call_set_env_string:
  4799 0000A6B3 E8C6000000          <1> 	call	set_environment_string
  4800 0000A6B8 728B                <1>         jc	short loc_set_cmd_failed
  4801                              <1> 
  4802 0000A6BA C3                  <1> 	retn              
  4803                              <1> 
  4804                              <1> get_environment_string:
  4805                              <1> 	; 12/04/2016
  4806                              <1> 	; 11/04/2016
  4807                              <1> 	; 05/04/2016 (TRDOS 386 = TRDOS v2.0)
  4808                              <1> 	; 02/09/2011 (TRDOS v1, MAINPROG.ASM)
  4809                              <1> 	; 28/08/2011
  4810                              <1> 	; INPUT->
  4811                              <1> 	;	EDI = Output buffer
  4812                              <1> 	;	CX = Buffer length (<= ENV_PAGE_SIZE)
  4813                              <1> 	;
  4814                              <1> 	;	AL > 0 = AL = String sequence number
  4815                              <1> 	;	AL = 0 -> ESI = ASCIIZ Set word 
  4816                              <1> 	;		(environment variable)
  4817                              <1> 	; OUTPUT ->
  4818                              <1> 	;	ESI is not changed
  4819                              <1> 	;	EDI is not changed
  4820                              <1> 	;	EAX = String length (with zero tail)
  4821                              <1> 	;	EDX = Environment variables page address
  4822                              <1> 	;	CF = 1 -> Not found (EAX not valid)
  4823                              <1> 	;
  4824                              <1> 	; (Modified registers: EAX, EDX) 
  4825                              <1> 
  4826 0000A6BB BA00300900          <1> 	mov	edx, Env_Page
  4827 0000A6C0 803A00              <1> 	cmp	byte [edx], 0
  4828 0000A6C3 7474                <1> 	jz	short get_env_string_with_word_stc_retn
  4829                              <1> 
  4830 0000A6C5 66890D[C08D0100]    <1> 	mov	[env_var_length], cx
  4831                              <1> 
  4832 0000A6CC 51                  <1> 	push	ecx ; *
  4833 0000A6CD 56                  <1> 	push	esi ; **
  4834                              <1> 
  4835 0000A6CE 08C0                <1> 	or	al, al
  4836 0000A6D0 7449                <1> 	jz	short get_env_string_with_word
  4837                              <1> 
  4838                              <1> get_env_string_with_seq_number:
  4839 0000A6D2 B101                <1> 	mov	cl, 1
  4840 0000A6D4 88C5                <1> 	mov	ch, al
  4841 0000A6D6 31C0                <1> 	xor	eax, eax
  4842 0000A6D8 89D6                <1> 	mov	esi, edx ; Env_Page
  4843                              <1> 
  4844                              <1> get_env_string_seq_number_check:
  4845 0000A6DA 38CD                <1> 	cmp	ch, cl
  4846 0000A6DC 7726                <1> 	ja	short get_env_string_seq_number_next
  4847                              <1> 
  4848                              <1> get_env_string_move_to_buff:
  4849 0000A6DE 57                  <1> 	push	edi ; ***
  4850                              <1> 
  4851 0000A6DF 29D2                <1> 	sub	edx, edx
  4852                              <1> 
  4853                              <1> get_env_string_seq_number_repeat1:
  4854 0000A6E1 42                  <1> 	inc	edx
  4855 0000A6E2 AC                  <1> 	lodsb
  4856 0000A6E3 AA                  <1> 	stosb
  4857                              <1> 
  4858 0000A6E4 66FF0D[C08D0100]    <1> 	dec	word [env_var_length]
  4859 0000A6EB 7508                <1> 	jnz	short get_env_string_seq_number_repeat3
  4860                              <1> 
  4861                              <1> get_env_string_seq_number_repeat2:
  4862 0000A6ED 20C0                <1> 	and	al, al
  4863 0000A6EF 7408                <1> 	jz	short get_env_string_seq_number_ok
  4864 0000A6F1 42                  <1> 	inc	edx
  4865 0000A6F2 AC                  <1> 	lodsb
  4866 0000A6F3 EBF8                <1> 	jmp	short get_env_string_seq_number_repeat2
  4867                              <1> 
  4868                              <1> get_env_string_seq_number_repeat3:
  4869 0000A6F5 08C0                <1> 	or	al, al
  4870 0000A6F7 75E8                <1> 	jnz	short get_env_string_seq_number_repeat1
  4871                              <1> 
  4872                              <1> get_env_string_seq_number_ok:
  4873 0000A6F9 5F                  <1> 	pop	edi ; ***
  4874 0000A6FA 89D0                <1> 	mov	eax, edx ; Length of the environment string
  4875                              <1> 			 ; (ASCIIZ, includes ZERO tail)
  4876 0000A6FC BA00300900          <1> 	mov	edx, Env_Page
  4877                              <1> 
  4878                              <1> get_env_string_stc_retn:
  4879 0000A701 5E                  <1> 	pop	esi ; **
  4880 0000A702 59                  <1> 	pop	ecx ; *
  4881 0000A703 C3                  <1> 	retn   
  4882                              <1> 	
  4883                              <1> get_env_string_seq_number_next:
  4884 0000A704 AC                  <1> 	lodsb
  4885 0000A705 08C0                <1> 	or	al, al
  4886 0000A707 75FB                <1> 	jnz	short get_env_string_seq_number_next
  4887                              <1> 
  4888 0000A709 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; +512 (+4096)
  4889 0000A70F F5                  <1> 	cmc
  4890 0000A710 72EF                <1> 	jc	short get_env_string_stc_retn
  4891                              <1> 
  4892 0000A712 AC                  <1> 	lodsb
  4893 0000A713 3C01                <1> 	cmp	al, 1
  4894 0000A715 72EA                <1> 	jb	short get_env_string_stc_retn
  4895 0000A717 FEC1                <1> 	inc	cl
  4896 0000A719 EBBF                <1> 	jmp	short get_env_string_seq_number_check
  4897                              <1> 
  4898                              <1> get_env_string_with_word:
  4899 0000A71B 31C9                <1> 	xor	ecx, ecx
  4900                              <1> 
  4901                              <1> get_env_string_calc_word_length:
  4902 0000A71D AC                  <1> 	lodsb 
  4903 0000A71E 3C20                <1> 	cmp	al, 20h
  4904 0000A720 7211                <1> 	jb	short get_env_string_calc_word_length_ok
  4905                              <1> 	;inc	cx
  4906 0000A722 FEC1                <1> 	inc	cl
  4907                              <1> 
  4908 0000A724 3C61                <1> 	cmp	al, 'a'
  4909 0000A726 72F5                <1> 	jb	short get_env_string_calc_word_length
  4910 0000A728 3C7A                <1> 	cmp	al, 'z'
  4911 0000A72A 77F1                <1> 	ja	short get_env_string_calc_word_length
  4912 0000A72C 24DF                <1> 	and	al, 0DFh
  4913 0000A72E 8846FF              <1> 	mov	[esi-1], al
  4914 0000A731 EBEA                <1> 	jmp	short get_env_string_calc_word_length
  4915                              <1> 	
  4916                              <1> get_env_string_calc_word_length_ok:
  4917 0000A733 08C9                <1> 	or	cl, cl
  4918 0000A735 7506                <1> 	jnz	short get_env_string_calc_word_length_save
  4919                              <1>      
  4920 0000A737 5E                  <1> 	pop	esi ; **
  4921                              <1> 
  4922                              <1> get_env_string_stc_retn1:
  4923 0000A738 59                  <1> 	pop	ecx ; *
  4924                              <1>         
  4925                              <1> get_env_string_with_word_stc_retn:
  4926 0000A739 31C0                <1> 	xor	eax, eax  
  4927 0000A73B F9                  <1> 	stc
  4928 0000A73C C3                  <1> 	retn
  4929                              <1>   
  4930                              <1> get_env_string_calc_word_length_save:
  4931 0000A73D 871C24              <1> 	xchg	ebx, [esp] ; **
  4932 0000A740 89DE                <1> 	mov	esi, ebx 
  4933                              <1> 		; Start of the env string (to be searched)
  4934                              <1> 
  4935 0000A742 57                  <1> 	push	edi ; ***
  4936 0000A743 89D7                <1> 	mov	edi, edx ; Env_Page
  4937                              <1> 
  4938                              <1> get_env_string_compare:
  4939 0000A745 57                  <1> 	push	edi ; ****
  4940 0000A746 51                  <1> 	push	ecx ; ***** ; Variable name length
  4941                              <1> 
  4942                              <1> get_env_string_compare_rep:
  4943 0000A747 AC                  <1> 	lodsb
  4944 0000A748 AE                  <1> 	scasb
  4945 0000A749 7511                <1> 	jne	short get_env_string_compare_next1
  4946 0000A74B E2FA                <1> 	loop	get_env_string_compare_rep
  4947                              <1> 	
  4948 0000A74D 803F3D              <1> 	cmp	byte [edi], '='
  4949 0000A750 750A                <1> 	jne	short get_env_string_compare_next1
  4950                              <1>  
  4951 0000A752 59                  <1> 	pop	ecx ; *****
  4952 0000A753 5F                  <1> 	pop	edi ; ****
  4953 0000A754 89FE                <1> 	mov	esi, edi
  4954 0000A756 5F                  <1> 	pop	edi ; ***
  4955 0000A757 871C24              <1> 	xchg	ebx, [esp] ; **
  4956 0000A75A EB82                <1> 	jmp	short get_env_string_move_to_buff
  4957                              <1> 
  4958                              <1> get_env_string_compare_next1:
  4959 0000A75C 89FE                <1> 	mov	esi, edi
  4960 0000A75E 59                  <1> 	pop	ecx ; *****
  4961 0000A75F 5F                  <1> 	pop	edi ; ****
  4962                              <1> get_env_string_compare_next2:
  4963 0000A760 81FEFF310900        <1> 	cmp	esi, Env_Page + Env_Page_Size - 1 ; +511 (+4095)
  4964 0000A766 7310                <1> 	jnb	short get_env_string_compare_not_ok
  4965 0000A768 20C0                <1> 	and	al, al
  4966 0000A76A AC                  <1> 	lodsb
  4967 0000A76B 75F3                <1> 	jnz	short get_env_string_compare_next2
  4968 0000A76D 08C0                <1> 	or	al, al
  4969 0000A76F 7407                <1> 	jz	short get_env_string_compare_not_ok
  4970 0000A771 4E                  <1> 	dec	esi ; 12/04/2016
  4971 0000A772 89F7                <1> 	mov	edi, esi
  4972 0000A774 89DE                <1> 	mov	esi, ebx
  4973 0000A776 EBCD                <1> 	jmp	short get_env_string_compare
  4974                              <1> 
  4975                              <1> get_env_string_compare_not_ok:
  4976 0000A778 5F                  <1> 	pop	edi ; ***
  4977 0000A779 89DE                <1> 	mov	esi, ebx
  4978 0000A77B 5B                  <1> 	pop	ebx ; **
  4979 0000A77C EBBA                <1> 	jmp	short get_env_string_stc_retn1
  4980                              <1> 
  4981                              <1> set_environment_string:
  4982                              <1> 	; 13/04/2016
  4983                              <1> 	; 12/04/2016
  4984                              <1> 	; 11/04/2016
  4985                              <1> 	; 06/04/2016
  4986                              <1> 	; 05/04/2016 (TRDOS 386 = TRDOS v2.0)
  4987                              <1> 	; 02/09/2011 (TRDOS v1, MAINPROG.ASM)
  4988                              <1> 	; 29/08/2011
  4989                              <1> 	; 29/08/2011
  4990                              <1> 	; INPUT->
  4991                              <1> 	;	ESI = ASCIIZ environment string
  4992                              <1> 	; OUTPUT ->
  4993                              <1> 	;	ESI is not changed
  4994                              <1> 	;	CF = 1 -> Could not set, 
  4995                              <1> 	;	     insufficient environment space
  4996                              <1> 	;
  4997                              <1> 	; (EAX, EDX will be changed) 
  4998                              <1> 	;
  4999                              <1> 	;    (EAX = Start address of the env string if > 0)	
  5000                              <1> 	;    (EDX = Environment string length)	
  5001                              <1> 
  5002 0000A77E 56                  <1> 	push 	esi ; *
  5003                              <1> 
  5004 0000A77F 31C0                <1> 	xor	eax, eax
  5005                              <1> 
  5006                              <1> set_env_chk_validation1:
  5007 0000A781 FEC4                <1> 	inc	ah ; variable (string) length
  5008 0000A783 AC                  <1> 	lodsb
  5009 0000A784 3C3D                <1> 	cmp	al, '='
  5010 0000A786 7415                <1> 	je	short set_env_chk_validation2
  5011 0000A788 3C20                <1> 	cmp	al, 20h
  5012 0000A78A 720F                <1> 	jb	short set_env_string_stc
  5013                              <1> 
  5014                              <1> 	; 06/04/2016
  5015 0000A78C 3C61                <1> 	cmp	al, 'a'
  5016 0000A78E 72F1                <1> 	jb	short set_env_chk_validation1
  5017 0000A790 3C7A                <1> 	cmp	al, 'z'
  5018 0000A792 77ED                <1> 	ja	short set_env_chk_validation1
  5019 0000A794 2C20                <1> 	sub	al, 'a'-'A'
  5020 0000A796 8846FF              <1> 	mov	[esi-1], al
  5021 0000A799 EBE6                <1> 	jmp	short set_env_chk_validation1
  5022                              <1> 
  5023                              <1> set_env_string_stc:
  5024 0000A79B 5E                  <1> 	pop	esi ; *
  5025                              <1> 	;stc
  5026 0000A79C C3                  <1> 	retn 
  5027                              <1> 	   
  5028                              <1> set_env_chk_validation2:
  5029 0000A79D 51                  <1> 	push	ecx ; **
  5030 0000A79E 53                  <1> 	push	ebx ; *** 
  5031 0000A79F 57                  <1> 	push	edi ; ****
  5032                              <1> 
  5033                              <1> 	; 12/04/2016
  5034 0000A7A0 8B5C240C            <1> 	mov	ebx, [esp+12]
  5035                              <1> 
  5036                              <1> set_env_chk_validation2w:
  5037 0000A7A4 89F7                <1> 	mov	edi, esi
  5038 0000A7A6 4F                  <1> 	dec	edi
  5039                              <1> 
  5040 0000A7A7 807FFF20            <1> 	cmp	byte [edi-1], 20h
  5041 0000A7AB 771A                <1> 	ja	short set_env_chk_validation2z
  5042                              <1> 	
  5043 0000A7AD 56                  <1> 	push	esi
  5044 0000A7AE 89FE                <1> 	mov	esi, edi
  5045 0000A7B0 4E                  <1> 	dec	esi
  5046                              <1> 
  5047                              <1> set_env_chk_validation2x:
  5048 0000A7B1 4E                  <1> 	dec	esi
  5049                              <1> 
  5050 0000A7B2 39DE                <1> 	cmp	esi, ebx
  5051 0000A7B4 7207                <1> 	jb	short set_env_chk_validation2y
  5052                              <1> 
  5053 0000A7B6 4F                  <1> 	dec	edi
  5054                              <1> 
  5055 0000A7B7 8A06                <1> 	mov	al, [esi]
  5056 0000A7B9 8807                <1> 	mov	[edi], al
  5057                              <1> 
  5058 0000A7BB EBF4                <1> 	jmp	short set_env_chk_validation2x
  5059                              <1> 
  5060                              <1> set_env_chk_validation2y:
  5061 0000A7BD 5E                  <1> 	pop	esi
  5062                              <1> 
  5063                              <1> 	;mov	byte [ebx], 20h
  5064                              <1> 	
  5065 0000A7BE 43                  <1> 	inc 	ebx
  5066 0000A7BF 895C240C            <1> 	mov	[esp+12], ebx
  5067                              <1> 
  5068 0000A7C3 FECC                <1> 	dec 	ah ; 13/04/2016
  5069                              <1> 
  5070 0000A7C5 EBDD                <1> 	jmp	short set_env_chk_validation2w
  5071                              <1> 	
  5072                              <1> set_env_chk_validation2z:	
  5073 0000A7C7 BA00300900          <1> 	mov	edx, Env_Page
  5074 0000A7CC 89D7                <1> 	mov	edi, edx
  5075                              <1> 
  5076                              <1> set_env_chk_validation3:
  5077 0000A7CE AC                  <1> 	lodsb
  5078 0000A7CF 3C20                <1> 	cmp	al, 20h
  5079 0000A7D1 74FB                <1> 	je	short set_env_chk_validation3
  5080                              <1> 
  5081 0000A7D3 9C                  <1> 	pushf
  5082                              <1> 
  5083                              <1> 	; 12/04/2016
  5084                              <1> set_env_chk_validation3n:
  5085 0000A7D4 3C61                <1> 	cmp	al, 'a'
  5086 0000A7D6 720C                <1> 	jb	short set_env_chk_validation3c
  5087 0000A7D8 3C7A                <1> 	cmp	al, 'z'
  5088 0000A7DA 7705                <1> 	ja	short set_env_chk_validation3x
  5089 0000A7DC 2C20                <1> 	sub	al, 'a'-'A'
  5090 0000A7DE 8846FF              <1> 	mov	[esi-1], al
  5091                              <1> 
  5092                              <1> set_env_chk_validation3x:
  5093 0000A7E1 AC                  <1> 	lodsb
  5094 0000A7E2 EBF0                <1> 	jmp	short set_env_chk_validation3n
  5095                              <1> 
  5096                              <1> set_env_chk_validation3c:
  5097 0000A7E4 3C20                <1> 	cmp	al, 20h
  5098 0000A7E6 73F9                <1> 	jnb	short set_env_chk_validation3x
  5099                              <1> 		
  5100 0000A7E8 803F00              <1> 	cmp	byte [edi], 0
  5101 0000A7EB 7731                <1> 	ja	short set_env_chk_validation4
  5102                              <1> 
  5103 0000A7ED 9D                  <1> 	popf
  5104 0000A7EE 7228                <1> 	jb	short set_env_string_nothing
  5105                              <1> 
  5106 0000A7F0 B900020000          <1> 	mov	ecx, Env_Page_Size ; 512 (4096)
  5107                              <1> 
  5108 0000A7F5 89DE                <1> 	mov	esi, ebx ; 12/04/2016
  5109                              <1> 
  5110                              <1> set_env_string_copy_to_envb:
  5111 0000A7F7 AC                  <1> 	lodsb
  5112 0000A7F8 3C20                <1> 	cmp	al, 20h
  5113 0000A7FA 720A                <1> 	jb	short set_env_string_copy_to_envb_z
  5114 0000A7FC AA                  <1> 	stosb
  5115 0000A7FD E2F8                <1> 	loop	set_env_string_copy_to_envb
  5116                              <1> 
  5117                              <1> 	; 11/04/2016
  5118 0000A7FF 89D7                <1> 	mov	edi, edx ; Env_Page
  5119 0000A801 B900020000          <1> 	mov	ecx, Env_Page_Size 
  5120                              <1> 
  5121                              <1> set_env_string_copy_to_envb_z:
  5122 0000A806 52                  <1> 	push	edx  ; Start address of the variable
  5123 0000A807 BA00020000          <1> 	mov	edx, Env_Page_Size
  5124 0000A80C 29CA                <1> 	sub	edx, ecx ; variable (string) length
  5125                              <1> 
  5126 0000A80E 28C0                <1> 	sub	al, al ; 0
  5127 0000A810 F3AA                <1>  	rep	stosb ; clear remain bytes of the env page
  5128                              <1> 
  5129 0000A812 58                  <1> 	pop	eax  ; Start address of the variable
  5130                              <1> 
  5131                              <1> set_env_string_allocate_envb_retn:  ; stc or clc return
  5132 0000A813 5F                  <1> 	pop	edi ; ****
  5133 0000A814 5B                  <1> 	pop	ebx ; ***
  5134 0000A815 59                  <1> 	pop	ecx ; **
  5135 0000A816 5E                  <1> 	pop	esi ; *	
  5136 0000A817 C3                  <1> 	retn
  5137                              <1> 
  5138                              <1> set_env_string_nothing:
  5139 0000A818 31C0                <1> 	xor	eax, eax
  5140 0000A81A 31D2                <1> 	xor	edx, edx ; 11/04/2016
  5141 0000A81C EBF5                <1> 	jmp	short set_env_string_allocate_envb_retn
  5142                              <1> 
  5143                              <1> set_env_chk_validation4:
  5144                              <1> 	; 11/04/2016
  5145 0000A81E 9D                  <1> 	popf
  5146                              <1> 
  5147 0000A81F 89D6                <1> 	mov	esi, edx  ; Env_Page
  5148                              <1> 
  5149                              <1> set_env_chk_validation5:	
  5150 0000A821 89DF                <1> 	mov	edi, ebx  ; ASCIIZ environment string address	
  5151 0000A823 0FB6CC              <1> 	movzx	ecx, ah ; Variable (string) length (with '=')
  5152                              <1> 
  5153                              <1> set_env_chk_validation5_loop:
  5154 0000A826 AC                  <1> 	lodsb
  5155 0000A827 AE                  <1> 	scasb
  5156 0000A828 750A                <1> 	jne	short set_env_chk_validation6
  5157 0000A82A E2FA                <1> 	loop	set_env_chk_validation5_loop
  5158                              <1> 
  5159 0000A82C 3C3D                <1> 	cmp	al, '='
  5160 0000A82E 0F8483000000        <1>         je      set_env_change_variable
  5161                              <1> 
  5162                              <1> set_env_chk_validation6:
  5163 0000A834 08C0                <1> 	or	al, al ; 0
  5164 0000A836 7403                <1> 	jz	short set_env_chk_validation7
  5165                              <1> 
  5166 0000A838 AC                  <1> 	lodsb
  5167 0000A839 EBF9                <1> 	jmp	short set_env_chk_validation6
  5168                              <1> 
  5169                              <1> set_env_chk_validation7:
  5170 0000A83B 88E1                <1> 	mov	cl, ah
  5171 0000A83D 01F1                <1> 	add	ecx, esi
  5172 0000A83F 81F9FF310900        <1> 	cmp	ecx, Env_Page + Env_Page_Size - 1 
  5173                              <1> 		; 511 (4095) 
  5174                              <1> 		; strlen + '=' + 0
  5175 0000A845 72DA                <1> 	jb	short set_env_chk_validation5
  5176                              <1> 
  5177                              <1> set_env_chk_validation8: ; variable not found
  5178 0000A847 0FB6F4              <1> 	movzx	esi, ah  ; variable name length (with '=') 
  5179 0000A84A 01DE                <1> 	add	esi, ebx ; position just after of the '='
  5180                              <1> 
  5181                              <1> set_env_chk_validation8_loop:
  5182 0000A84C AC                  <1> 	lodsb
  5183 0000A84D 3C20                <1> 	cmp	al, 20h
  5184 0000A84F 74FB                <1> 	je	short set_env_chk_validation8_loop	
  5185 0000A851 72C5                <1> 	jb	short set_env_string_nothing
  5186                              <1> 
  5187                              <1> set_env_chk_validation9:
  5188 0000A853 AC                  <1> 	lodsb
  5189 0000A854 3C20                <1> 	cmp	al, 20h
  5190 0000A856 73FB                <1> 	jnb	short set_env_chk_validation9
  5191                              <1> 
  5192                              <1> 	; End of ASCIIZ environment string
  5193                              <1> 
  5194                              <1> set_env_add_variable:
  5195 0000A858 29DE                <1> 	sub	esi, ebx ; variable+definition length
  5196                              <1> 	
  5197 0000A85A 56                  <1> 	push	esi ; *****
  5198                              <1> 
  5199 0000A85B 89D6                <1> 	mov	esi, edx ; Environment page address
  5200                              <1> 
  5201 0000A85D B900020000          <1> 	mov	ecx, Env_Page_Size ; 512 (4096)	
  5202                              <1> 
  5203                              <1> set_env_add_variable_loop:
  5204 0000A862 AC                  <1> 	lodsb
  5205 0000A863 20C0                <1> 	and	al, al		
  5206 0000A865 7406                <1> 	jz	short set_env_add_variable_chk1 ; 0
  5207 0000A867 E2F9                <1> 	loop	set_env_add_variable_loop
  5208                              <1> 
  5209                              <1> 	; 11/04/2016
  5210 0000A869 884EFF              <1> 	mov	[esi-1], cl ; 0
  5211 0000A86C 41                  <1> 	inc	ecx
  5212                              <1> 	
  5213                              <1> set_env_add_variable_chk1: 
  5214 0000A86D 49                  <1> 	dec	ecx
  5215 0000A86E 7408                <1> 	jz	short set_env_add_variable_nspc
  5216 0000A870 AC                  <1> 	lodsb
  5217 0000A871 08C0                <1> 	or 	al, al
  5218 0000A873 740C                <1> 	jz	short set_env_add_variable_chk2 ; 00
  5219 0000A875 49                  <1> 	dec	ecx
  5220 0000A876 75EA                <1> 	jnz	short set_env_add_variable_loop
  5221                              <1> 
  5222                              <1> set_env_add_variable_nspc: ; no space on environment page
  5223 0000A878 58                  <1> 	pop	eax ; *****
  5224 0000A879 B808000000          <1> 	mov	eax, 8 ; No space for new environment string
  5225 0000A87E F9                  <1> 	stc
  5226 0000A87F EB92                <1>         jmp     short set_env_string_allocate_envb_retn
  5227                              <1> 
  5228                              <1> set_env_add_variable_chk2:
  5229 0000A881 8B0C24              <1> 	mov	ecx, [esp] ; *****
  5230 0000A884 4E                  <1> 	dec	esi ; beginning address of the new variable
  5231 0000A885 89F0                <1> 	mov	eax, esi
  5232 0000A887 01C8                <1> 	add	eax, ecx ; string length (with CR)
  5233 0000A889 81C200020000        <1> 	add	edx, Env_Page_Size ; 512 (4096)
  5234 0000A88F 39D0                <1> 	cmp	eax, edx 
  5235 0000A891 77E5                <1> 	ja	short set_env_add_variable_nspc
  5236 0000A893 49                  <1> 	dec	ecx ; except CR at the end
  5237 0000A894 89CA                <1> 	mov	edx, ecx ; 12/04/2016
  5238 0000A896 89F7                <1> 	mov	edi, esi
  5239 0000A898 893C24              <1> 	mov	[esp], edi ; ***** ; Start address of new variable
  5240 0000A89B 89DE                <1> 	mov	esi, ebx ; ASCIIZ environment string address
  5241 0000A89D F3A4                <1> 	rep	movsb
  5242 0000A89F 28C0                <1> 	sub	al, al
  5243 0000A8A1 AA                  <1> 	stosb
  5244 0000A8A2 58                  <1> 	pop	eax ; ***** ; Beginning address of new variable			
  5245 0000A8A3 81FF00320900        <1>         cmp     edi, Env_Page + Env_Page_Size ; 12/04/2016
  5246 0000A8A9 0F8364FFFFFF        <1>         jnb     set_env_string_allocate_envb_retn ; OK !
  5247 0000A8AF 880F                <1> 	mov	[edi], cl ; 0
  5248 0000A8B1 F8                  <1> 	clc	; 13/04/2016
  5249 0000A8B2 E95CFFFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5250                              <1> 
  5251                              <1> set_env_change_variable:
  5252                              <1> 	; 06/04/2016
  5253                              <1> 	; esi = Variable's address in environment page (after '=')
  5254                              <1> 	; edi = ASCIIZ environment string address (after '=')
  5255                              <1> 
  5256                              <1> 	; ah = variable length from start to the '='
  5257 0000A8B7 8825[C08D0100]      <1> 	mov	[env_var_length], ah
  5258                              <1> 
  5259 0000A8BD 28C9                <1> 	sub	cl, cl ; ecx = 0
  5260                              <1> 
  5261 0000A8BF 57                  <1> 	push	edi ; *****
  5262                              <1> 
  5263 0000A8C0 89F7                <1> 	mov	edi, esi ; 11/04/2016
  5264                              <1> 
  5265                              <1> set_env_change_variable_calc1:
  5266 0000A8C2 AC                  <1> 	lodsb
  5267 0000A8C3 08C0                <1> 	or	al, al
  5268 0000A8C5 7403                <1> 	jz	short set_env_change_variable_calc2
  5269                              <1> 
  5270 0000A8C7 41                  <1> 	inc	ecx ; length of environment string (after the '=')
  5271                              <1> 
  5272 0000A8C8 EBF8                <1> 	jmp	short set_env_change_variable_calc1	
  5273                              <1> 
  5274                              <1> set_env_change_variable_calc2:
  5275 0000A8CA 8B3424              <1> 	mov	esi, [esp] ; ASCIIZ environment string address
  5276                              <1> 	
  5277 0000A8CD 29D2                <1> 	sub	edx, edx
  5278                              <1> 
  5279                              <1> set_env_change_variable_calc3:
  5280 0000A8CF AC                  <1> 	lodsb
  5281 0000A8D0 3C20                <1> 	cmp	al, 20h
  5282 0000A8D2 7203                <1> 	jb	short set_env_change_variable_calc4
  5283                              <1> 
  5284 0000A8D4 42                  <1> 	inc	edx ; length of ASCIIZ string (after the '=')
  5285                              <1> 	
  5286 0000A8D5 EBF8                <1> 	jmp	short set_env_change_variable_calc3
  5287                              <1> 	
  5288                              <1> set_env_change_variable_calc4:
  5289 0000A8D7 C646FF00            <1> 	mov	byte [esi-1], 0  ; put ZERO instead of CR
  5290                              <1> 	
  5291 0000A8DB 5E                  <1> 	pop	esi ; ***** ; ASCIIZ string address (after '=')
  5292                              <1> 
  5293                              <1> 	; EDI = Old variable's address (after '=')
  5294                              <1> 	
  5295                              <1> 	; compare the new string with the old string
  5296 0000A8DC 39CA                <1> 	cmp	edx, ecx
  5297 0000A8DE 7717                <1> 	ja	short set_env_change_variable_calc5 ; longer
  5298 0000A8E0 0F828F000000        <1>         jb      set_env_change_variable_calc9 ; shorter
  5299                              <1> 	
  5300                              <1> 	;same length (simple copy)
  5301 0000A8E6 0FB6C4              <1> 	movzx	eax, ah
  5302 0000A8E9 01C2                <1> 	add	edx, eax
  5303 0000A8EB F7D8                <1> 	neg	eax
  5304 0000A8ED 01F8                <1> 	add	eax, edi
  5305                              <1> 	; EAX = Start address of the variable
  5306                              <1> 	; EDX = Variable length (without ZERO at the end of variable)
  5307                              <1> 
  5308 0000A8EF F3A4                <1> 	rep	movsb
  5309 0000A8F1 F8                  <1> 	clc	; 13/04/2016
  5310 0000A8F2 E91CFFFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5311                              <1> 
  5312                              <1> set_env_change_variable_calc5:
  5313                              <1> 	; 11/04/2016
  5314 0000A8F7 52                  <1> 	push	edx ; *****
  5315 0000A8F8 29CA                <1> 	sub	edx, ecx ; difference ; (the new string is longer)
  5316 0000A8FA 89F3                <1> 	mov 	ebx, esi
  5317 0000A8FC 89FE                <1> 	mov	esi, edi
  5318                              <1> 
  5319                              <1> set_env_change_variable_calc6:
  5320 0000A8FE AC                  <1> 	lodsb 
  5321 0000A8FF 20C0                <1> 	and	al, al
  5322 0000A901 75FB                <1> 	jnz	short set_env_change_variable_calc6
  5323                              <1> 
  5324 0000A903 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; 512 (4096)
  5325 0000A909 0F8369FFFFFF        <1>         jnb     set_env_add_variable_nspc
  5326                              <1> 
  5327 0000A90F 89F9                <1> 	mov	ecx, edi  ; current (old) variable's address
  5328 0000A911 89F7                <1> 	mov	edi, esi  ; next variable's address 
  5329                              <1> 
  5330 0000A913 AC                  <1> 	lodsb
  5331 0000A914 08C0                <1> 	or	al, al
  5332 0000A916 7416                <1> 	jz	short set_env_change_variable_calc8 ; 00
  5333                              <1> 
  5334                              <1> set_env_change_variable_calc7:
  5335 0000A918 AC                  <1> 	lodsb
  5336 0000A919 20C0                <1> 	and	al, al
  5337 0000A91B 75FB                <1> 	jnz	short set_env_change_variable_calc7
  5338                              <1> 
  5339 0000A91D 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; 512 (4096)
  5340 0000A923 0F834FFFFFFF        <1>         jnb     set_env_add_variable_nspc
  5341                              <1> 
  5342 0000A929 AC                  <1> 	lodsb
  5343 0000A92A 08C0                <1> 	or	al, al
  5344 0000A92C 75EA                <1> 	jnz	short set_env_change_variable_calc7
  5345                              <1> 
  5346                              <1> set_env_change_variable_calc8:
  5347 0000A92E 4E                  <1> 	dec	esi ; address of the second (last) 0 of the 00
  5348                              <1> 
  5349 0000A92F 01F2                <1> 	add	edx, esi ; final position of the last 0
  5350                              <1> 
  5351 0000A931 81FA00320900        <1> 	cmp	edx, Env_Page + Env_Page_Size ; 512 (4096)
  5352 0000A937 0F833BFFFFFF        <1>         jnb     set_env_add_variable_nspc
  5353                              <1> 
  5354 0000A93D 89C8                <1> 	mov	eax, ecx ; old variable's address (after '=')
  5355                              <1> 
  5356 0000A93F 89F1                <1> 	mov	ecx, esi 
  5357 0000A941 29F9                <1> 	sub	ecx, edi ; count of bytes to move forward
  5358                              <1> 
  5359                              <1> 	; 13/04/2016
  5360 0000A943 C60200              <1> 	mov	byte [edx], 0
  5361 0000A946 89D7                <1> 	mov	edi, edx
  5362 0000A948 29F2                <1> 	sub	edx, esi ; difference (additional byte count)
  5363 0000A94A 4F                  <1> 	dec	edi ; the last zero address (first byte of the 00)
  5364 0000A94B 89FE                <1> 	mov	esi, edi
  5365 0000A94D 29D6                <1> 	sub	esi, edx ; - displacement
  5366                              <1> 	
  5367 0000A94F FA                  <1> 	cli	; disable interrupts
  5368 0000A950 FD                  <1> 	std	; backward
  5369                              <1> 
  5370 0000A951 F3A4                <1> 	rep	movsb ; move ECX bytes from DS:ESI to ES:EDI
  5371                              <1> 
  5372 0000A953 FC                  <1> 	cld	; forward (default)
  5373 0000A954 FB                  <1> 	sti	; enable interrupts
  5374                              <1> 	
  5375 0000A955 89C7                <1> 	mov	edi, eax
  5376 0000A957 59                  <1> 	pop	ecx ; ***** ; byte count (after '=')
  5377 0000A958 89CA                <1> 	mov	edx, ecx
  5378 0000A95A 89DE                <1> 	mov	esi, ebx ; ASCIIZ string address (after '=')
  5379 0000A95C 89FB                <1> 	mov	ebx, edi
  5380                              <1> 
  5381 0000A95E F3A4                <1> 	rep	movsb
  5382                              <1> 
  5383 0000A960 880F                <1> 	mov	[edi], cl ; 0 ; end of variable
  5384                              <1> 
  5385 0000A962 0FB605[C08D0100]    <1> 	movzx	eax, byte [env_var_length]
  5386 0000A969 01C2                <1> 	add	edx, eax ; variable length (total)
  5387 0000A96B F7D8                <1> 	neg	eax
  5388 0000A96D 01D8                <1> 	add	eax, ebx ; start address of the variable
  5389 0000A96F F8                  <1> 	clc	; 13/04/2016
  5390 0000A970 E99EFEFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5391                              <1> 
  5392                              <1> set_env_change_variable_calc9:
  5393                              <1> 	; 11/04/2016
  5394 0000A975 21D2                <1> 	and	edx, edx ; is empty ?
  5395 0000A977 753B                <1> 	jnz	short set_env_change_variable_calc15
  5396                              <1> 	
  5397 0000A979 0FB6DC              <1> 	movzx	ebx, ah
  5398 0000A97C F7DB                <1> 	neg	ebx
  5399 0000A97E 01FB                <1> 	add	ebx, edi
  5400                              <1> 
  5401                              <1> 	; EBX = Start address of the variable (in env page)
  5402                              <1> 	; EDX = Variable length = 0
  5403                              <1> 	
  5404 0000A980 89FE                <1> 	mov	esi, edi
  5405                              <1> 
  5406                              <1> set_env_change_variable_calc10:
  5407 0000A982 AC                  <1> 	lodsb
  5408 0000A983 08C0                <1> 	or	al, al
  5409 0000A985 75FB                <1> 	jnz	short set_env_change_variable_calc10
  5410                              <1> 
  5411 0000A987 B9FF310900          <1> 	mov	ecx, Env_Page + Env_Page_Size - 1
  5412                              <1> 
  5413 0000A98C 39CE                <1> 	cmp	esi, ecx ; +511 (+4095)
  5414 0000A98E 7604                <1> 	jna	short set_env_change_variable_calc11
  5415                              <1> 
  5416 0000A990 89CE                <1> 	mov	esi, ecx
  5417 0000A992 8806                <1> 	mov	[esi], al ; 0
  5418                              <1> 
  5419                              <1> set_env_change_variable_calc11:
  5420 0000A994 89DF                <1> 	mov	edi, ebx ; old variable's start address
  5421                              <1> 
  5422                              <1> set_env_change_variable_calc12:
  5423 0000A996 AC                  <1> 	lodsb
  5424 0000A997 AA                  <1> 	stosb
  5425 0000A998 20C0                <1> 	and	al, al
  5426 0000A99A 75FA                <1> 	jnz	short set_env_change_variable_calc12
  5427 0000A99C 39CE                <1> 	cmp	esi, ecx
  5428 0000A99E 7706                <1> 	ja	short set_env_change_variable_calc13
  5429 0000A9A0 AC                  <1> 	lodsb
  5430 0000A9A1 AA                  <1> 	stosb
  5431 0000A9A2 20C0                <1> 	and	al, al
  5432 0000A9A4 75F0                <1> 	jnz	short set_env_change_variable_calc12	
  5433                              <1> 
  5434                              <1> set_env_change_variable_calc13:
  5435 0000A9A6 29F9                <1> 	sub	ecx, edi
  5436 0000A9A8 7203                <1> 	jb	short set_env_change_variable_calc14
  5437 0000A9AA 41                  <1> 	inc	ecx ; 1-512 (1-4096)
  5438 0000A9AB F3AA                <1> 	rep	stosb ; al = 0	
  5439                              <1> 
  5440                              <1> set_env_change_variable_calc14:
  5441 0000A9AD 29C0                <1> 	sub	eax, eax ; Start address of the variable
  5442                              <1> 	; EAX = 0 -> Variable is removed
  5443                              <1> 	; EDX = Variable length = 0	
  5444                              <1> 
  5445 0000A9AF E95FFEFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5446                              <1> 	    
  5447                              <1> set_env_change_variable_calc15:	
  5448 0000A9B4 52                  <1> 	push	edx ; *****
  5449 0000A9B5 F7DA                <1> 	neg	edx
  5450 0000A9B7 01CA                <1> 	add	edx, ecx ; difference (the old string is longer)
  5451 0000A9B9 89F3                <1> 	mov 	ebx, esi
  5452 0000A9BB 89FE                <1> 	mov	esi, edi
  5453                              <1> 
  5454                              <1> set_env_change_variable_calc16:
  5455 0000A9BD AC                  <1> 	lodsb 
  5456 0000A9BE 20C0                <1> 	and	al, al
  5457 0000A9C0 75FB                <1> 	jnz	short set_env_change_variable_calc16
  5458                              <1> 
  5459 0000A9C2 B900320900          <1> 	mov	ecx, Env_Page + Env_Page_Size
  5460                              <1> 
  5461 0000A9C7 39CE                <1> 	cmp	esi, ecx ; +512 (+4096)
  5462 0000A9C9 7605                <1> 	jna	short set_env_change_variable_calc17
  5463                              <1> 
  5464 0000A9CB 89CE                <1> 	mov	esi, ecx
  5465 0000A9CD 8846FF              <1> 	mov	[esi-1], al ; 0
  5466                              <1> 
  5467                              <1> set_env_change_variable_calc17:
  5468 0000A9D0 89F9                <1> 	mov	ecx, edi  ; current (old) variable's address
  5469 0000A9D2 89F7                <1> 	mov	edi, esi  ; next variable's address 
  5470                              <1> 
  5471 0000A9D4 AC                  <1> 	lodsb
  5472 0000A9D5 08C0                <1> 	or	al, al
  5473 0000A9D7 741D                <1> 	jz	short set_env_change_variable_calc20
  5474                              <1> 
  5475                              <1> set_env_change_variable_calc18:
  5476 0000A9D9 AC                  <1> 	lodsb
  5477 0000A9DA 20C0                <1> 	and	al, al
  5478 0000A9DC 75FB                <1> 	jnz	short set_env_change_variable_calc18
  5479                              <1> 
  5480 0000A9DE 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size
  5481 0000A9E4 720B                <1> 	jb	short set_env_change_variable_calc19
  5482 0000A9E6 740E                <1> 	je	short set_env_change_variable_calc20
  5483                              <1> 
  5484 0000A9E8 BEFF310900          <1> 	mov	esi, Env_Page + Env_Page_Size - 1
  5485 0000A9ED 8806                <1> 	mov	[esi], al ; 0
  5486 0000A9EF EB06                <1> 	jmp	short set_env_change_variable_calc21
  5487                              <1> 
  5488                              <1> set_env_change_variable_calc19:
  5489 0000A9F1 AC                  <1> 	lodsb
  5490 0000A9F2 08C0                <1> 	or	al, al
  5491 0000A9F4 75E3                <1> 	jnz	short set_env_change_variable_calc18
  5492                              <1> 
  5493                              <1> set_env_change_variable_calc20:
  5494 0000A9F6 4E                  <1> 	dec	esi ; address of the second (last) 0 of the 00
  5495                              <1> 
  5496                              <1> set_env_change_variable_calc21:
  5497                              <1> 	; edx = difference (byte count)
  5498                              <1> 	
  5499 0000A9F7 89C8                <1> 	mov	eax, ecx ; old variable's address (after '=')
  5500                              <1> 
  5501 0000A9F9 89F1                <1> 	mov	ecx, esi 
  5502 0000A9FB 29F9                <1> 	sub	ecx, edi ; count of bytes to move backward
  5503                              <1> 
  5504 0000A9FD 89FE                <1> 	mov	esi, edi ; next variable's address
  5505 0000A9FF 29D7                <1> 	sub	edi, edx ; (displacement)
  5506                              <1> 	
  5507 0000AA01 F3A4                <1> 	rep	movsb
  5508                              <1> 
  5509 0000AA03 880F                <1> 	mov	[edi], cl ; 0 ; 00 ; end of environment variables
  5510                              <1> 
  5511 0000AA05 89C7                <1> 	mov	edi, eax
  5512 0000AA07 5A                  <1> 	pop	edx ; ***** ; byte count (after '=')
  5513 0000AA08 89D1                <1> 	mov	ecx, edx
  5514 0000AA0A 89DE                <1> 	mov	esi, ebx ; ASCIIZ string address (after '=')
  5515 0000AA0C 89FB                <1> 	mov	ebx, edi
  5516                              <1> 	
  5517 0000AA0E F3A4                <1> 	rep	movsb
  5518                              <1> 
  5519 0000AA10 880F                <1> 	mov	[edi], cl ; 0 ; end of variable
  5520                              <1> 
  5521 0000AA12 0FB605[C08D0100]    <1> 	movzx	eax, byte [env_var_length]
  5522 0000AA19 01C2                <1> 	add	edx, eax ; variable length (total)
  5523 0000AA1B F7D8                <1> 	neg	eax
  5524 0000AA1D 01D8                <1> 	add	eax, ebx ; start address of the variable
  5525 0000AA1F F8                  <1> 	clc	; 13/04/2016
  5526 0000AA20 E9EEFDFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5527                              <1> 
  5528                              <1> mainprog_startup_configuration:
  5529                              <1> 	; 22/11/2017
  5530                              <1> 	; 06/05/2016
  5531                              <1> 	; 14/04/2016 (TRDOS 386 = TRDOS v2.0)
  5532                              <1> 	; 17/09/2011 (TRDOS v1, MAINPROG.ASM)
  5533                              <1> 	;
  5534                              <1> loc_load_mainprog_cfg_file:
  5535 0000AA25 BE[69380100]        <1> 	mov	esi, MainProgCfgFile
  5536 0000AA2A 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  5537 0000AA2E E83EEAFFFF          <1> 	call	find_first_file
  5538 0000AA33 7256                <1> 	jc	short loc_load_mainprog_cfg_exit
  5539                              <1> 
  5540                              <1> 	;or	eax, eax
  5541                              <1> 	;jz	short loc_load_mainprog_cfg_exit
  5542                              <1> 
  5543                              <1> loc_start_mainprog_configuration:
  5544                              <1> 	; ESI = FindFile_DirEntry Location
  5545                              <1> 	; EAX = File Size
  5546                              <1> 
  5547 0000AA35 A3[44820100]        <1> 	mov	[MainProgCfg_FileSize], eax
  5548                              <1> 
  5549 0000AA3A 668B5614            <1> 	mov	dx, [esi+DirEntry_FstClusHI]
  5550 0000AA3E C1E210              <1> 	shl	edx, 16
  5551 0000AA41 668B561A            <1> 	mov	dx, [esi+DirEntry_FstClusLO]
  5552 0000AA45 8915[748D0100]      <1> 	mov	[csftdf_sf_cluster], edx
  5553                              <1> 
  5554 0000AA4B 89C1                <1> 	mov	ecx, eax
  5555 0000AA4D 29C0                <1> 	sub	eax, eax
  5556                              <1> 
  5557                              <1> 	; TRDOS 386 (TRDOS v2.0)
  5558                              <1> 	; Allocate contiguous memory block for loading the file
  5559                              <1> 	
  5560                              <1> 	; eax = 0 (Allocate memory from the beginning)
  5561                              <1> 	; ecx = File (Allocation) size in bytes
  5562                              <1> 	
  5563 0000AA4F E81FBAFFFF          <1> 	call	allocate_memory_block
  5564 0000AA54 7235                <1> 	jc	short loc_load_mainprog_cfg_exit
  5565                              <1> 
  5566 0000AA56 A3[6C8D0100]        <1> 	mov	[csftdf_sf_mem_addr], eax ; loading address
  5567 0000AA5B 890D[708D0100]      <1> 	mov	[csftdf_sf_mem_bsize], ecx ; block size
  5568                              <1> 
  5569 0000AA61 31DB                <1> 	xor	ebx, ebx
  5570                              <1> 	;mov	[csftdf_sf_rbytes], ebx ; 0, reset
  5571                              <1> 
  5572 0000AA63 8A3D[56820100]      <1> 	mov	bh, [Current_Drv] ; [FindFile_Drv]
  5573 0000AA69 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  5574 0000AA6E 01DE                <1> 	add	esi, ebx
  5575                              <1> 
  5576 0000AA70 8B1D[6C8D0100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  5577                              <1> 
  5578 0000AA76 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  5579 0000AA7A 7710                <1>         ja	short loc_mcfg_load_fat_file
  5580                              <1> 
  5581 0000AA7C C705[7C8D0100]0000- <1> 	mov	dword [csftdf_r_size], 65536
  5581 0000AA84 0100                <1>
  5582 0000AA86 E9A1010000          <1>         jmp     loc_mcfg_load_fs_file
  5583                              <1> 
  5584                              <1> loc_load_mainprog_cfg_exit:
  5585 0000AA8B C3                  <1> 	retn 
  5586                              <1> 
  5587                              <1> loc_mcfg_load_fat_file:
  5588 0000AA8C 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
  5589 0000AA90 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  5590 0000AA94 F7E1                <1> 	mul	ecx
  5591 0000AA96 A3[7C8D0100]        <1> 	mov	[csftdf_r_size], eax
  5592                              <1> 
  5593                              <1> loc_mcfg_load_fat_file_next:
  5594 0000AA9B E822010000          <1> 	call	mcfg_read_fat_file_sectors
  5595 0000AAA0 0F8206010000        <1>         jc      mcfg_deallocate_mem
  5596                              <1> 
  5597 0000AAA6 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  5598 0000AAA8 74F1                <1> 	jz	short loc_mcfg_load_fat_file_next
  5599                              <1> 
  5600                              <1> loc_mcfg_load_fat_file_ok:
  5601                              <1> 	; 06/05/2016
  5602 0000AAAA C705[108E0100]-     <1> 	mov	dword [mainprog_return_addr], loc_mcfg_ci_return_addr 
  5602 0000AAB0 [6DAB0000]          <1>
  5603                              <1> 	;
  5604 0000AAB4 8B35[6C8D0100]      <1> 	mov	esi, [csftdf_sf_mem_addr]
  5605 0000AABA 8935[48820100]      <1> 	mov	[MainProgCfg_LineOffset], esi
  5606                              <1> 	
  5607 0000AAC0 A1[44820100]        <1> 	mov	eax, [MainProgCfg_FileSize]
  5608 0000AAC5 89C2                <1> 	mov	edx, eax
  5609 0000AAC7 01F2                <1> 	add	edx, esi
  5610                              <1> 
  5611                              <1> loc_mcfg_process_next_line_check:
  5612 0000AAC9 89C1                <1> 	mov	ecx, eax
  5613                              <1> 
  5614 0000AACB 803E2A              <1> 	cmp	byte [esi], "*" ; Remark sign
  5615 0000AACE 7503                <1> 	jne	short loc_mcfg_process_next_line
  5616 0000AAD0 46                  <1> 	inc	esi
  5617 0000AAD1 EB17                <1> 	jmp	short loc_move_mainprog_cfg_nl1
  5618                              <1> 
  5619                              <1> loc_mcfg_process_next_line:
  5620 0000AAD3 83F94F              <1> 	cmp	ecx, 79
  5621 0000AAD6 7605                <1> 	jna	short loc_start_mainprog_cfg_process
  5622                              <1> 	
  5623 0000AAD8 B94F000000          <1> 	mov	ecx, 79 
  5624                              <1> 
  5625                              <1> loc_start_mainprog_cfg_process:
  5626 0000AADD BF[06830100]        <1> 	mov	edi, CommandBuffer
  5627                              <1> 
  5628                              <1> loc_move_mainprog_cfg_line:
  5629 0000AAE2 AC                  <1> 	lodsb
  5630 0000AAE3 3C20                <1> 	cmp	al, 20h
  5631 0000AAE5 720C                <1> 	jb	short loc_move_mainprog_cfg_nl2
  5632 0000AAE7 AA                  <1> 	stosb
  5633 0000AAE8 E2F8                <1> 	loop	loc_move_mainprog_cfg_line
  5634                              <1> 
  5635                              <1> loc_move_mainprog_cfg_nl1:
  5636 0000AAEA 39D6                <1> 	cmp	esi, edx ; + configuration file size
  5637 0000AAEC 7312                <1> 	jnb	short loc_end_of_mainprog_cfg_line
  5638 0000AAEE AC                  <1> 	lodsb
  5639 0000AAEF 3C20                <1> 	cmp	al, 20h
  5640 0000AAF1 73F7                <1> 	jnb	short loc_move_mainprog_cfg_nl1
  5641                              <1> 
  5642                              <1> loc_move_mainprog_cfg_nl2:
  5643 0000AAF3 39D6                <1> 	cmp	esi, edx
  5644 0000AAF5 7309                <1> 	jnb	short loc_end_of_mainprog_cfg_line
  5645 0000AAF7 8A06                <1> 	mov	al, [esi]
  5646 0000AAF9 3C20                <1> 	cmp	al, 20h
  5647 0000AAFB 7703                <1>  	ja	short loc_end_of_mainprog_cfg_line
  5648 0000AAFD 46                  <1> 	inc	esi
  5649 0000AAFE EBF3                <1> 	jmp	short loc_move_mainprog_cfg_nl2	               
  5650                              <1> 
  5651                              <1> loc_end_of_mainprog_cfg_line:
  5652 0000AB00 C60700              <1> 	mov	byte [edi], 0
  5653                              <1> 
  5654 0000AB03 8935[48820100]      <1> 	mov	[MainProgCfg_LineOffset], esi
  5655                              <1> 
  5656                              <1> 	; 22/11/2017
  5657 0000AB09 BE[0E830100]        <1> 	mov	esi, CommandBuffer + 8
  5658 0000AB0E 29FE                <1> 	sub	esi, edi
  5659 0000AB10 7606                <1> 	jna	short loc_move_mainprog_cfg_command
  5660 0000AB12 30C0                <1> 	xor	al, al
  5661                              <1> loc_mainprog_cfg_clear_chrs:
  5662 0000AB14 AA                  <1> 	stosb
  5663 0000AB15 4E                  <1> 	dec	esi
  5664 0000AB16 75FC                <1> 	jnz	short loc_mainprog_cfg_clear_chrs	
  5665                              <1> 
  5666                              <1> loc_move_mainprog_cfg_command:
  5667 0000AB18 BE[06830100]        <1> 	mov	esi, CommandBuffer
  5668 0000AB1D 89F7                <1> 	mov	edi, esi
  5669 0000AB1F 31DB                <1> 	xor	ebx, ebx
  5670                              <1> 	;xor	ecx, ecx
  5671 0000AB21 30C9                <1> 	xor	cl, cl
  5672                              <1> 
  5673                              <1> loc_move_mcfg_first_cmd_char:
  5674 0000AB23 8A041E              <1> 	mov	al, [esi+ebx]
  5675 0000AB26 FEC3                <1> 	inc	bl 
  5676 0000AB28 3C20                <1> 	cmp	al, 20h
  5677 0000AB2A 7712                <1> 	ja	short loc_move_mcfg_cmd_capitalizing
  5678 0000AB2C 7237                <1> 	jb	short loc_move_mcfg_cmd_arguments_ok
  5679 0000AB2E 80FB4F              <1> 	cmp	bl, 79
  5680 0000AB31 72F0                <1> 	jb	short loc_move_mcfg_first_cmd_char
  5681 0000AB33 EB30                <1> 	jmp	short loc_move_mcfg_cmd_arguments_ok
  5682                              <1> 
  5683                              <1> loc_move_mcfg_next_cmd_char:
  5684 0000AB35 8A041E              <1> 	mov	al, [esi+ebx]
  5685 0000AB38 FEC3                <1> 	inc	bl
  5686 0000AB3A 3C20                <1> 	cmp	al, 20h
  5687 0000AB3C 7614                <1> 	jna	short loc_move_mcfg_cmd_ok
  5688                              <1> 
  5689                              <1> loc_move_mcfg_cmd_capitalizing:
  5690 0000AB3E 3C61                <1> 	cmp	al, 61h ; 'a'
  5691 0000AB40 7206                <1> 	jb	short loc_move_mcfg_cmd_caps_ok
  5692 0000AB42 3C7A                <1> 	cmp	al, 7Ah ; 'z'
  5693 0000AB44 7702                <1> 	ja	short loc_move_mcfg_cmd_caps_ok
  5694 0000AB46 24DF                <1> 	and	al, 0DFh ; sub	al, 'a'-'A'
  5695                              <1> 
  5696                              <1> loc_move_mcfg_cmd_caps_ok:
  5697 0000AB48 AA                  <1> 	stosb 
  5698 0000AB49 FEC1                <1> 	inc	cl
  5699 0000AB4B 80FB4F              <1> 	cmp	bl, 79
  5700 0000AB4E 72E5                <1> 	jb	short loc_move_mcfg_next_cmd_char
  5701 0000AB50 EB13                <1> 	jmp	short loc_move_mcfg_cmd_arguments_ok
  5702                              <1> 
  5703                              <1> loc_move_mcfg_cmd_ok:
  5704 0000AB52 30C0                <1> 	xor	al, al ; 0
  5705                              <1> 
  5706                              <1> loc_move_mcfg_cmd_arguments:
  5707 0000AB54 8807                <1> 	mov	[edi], al
  5708 0000AB56 47                  <1> 	inc	edi
  5709 0000AB57 80FB4F              <1> 	cmp	bl, 79
  5710 0000AB5A 7309                <1> 	jnb	short loc_move_mcfg_cmd_arguments_ok
  5711 0000AB5C 8A041E              <1> 	mov	al, [esi+ebx]
  5712 0000AB5F FEC3                <1> 	inc	bl
  5713 0000AB61 3C20                <1> 	cmp	al, 20h
  5714 0000AB63 73EF                <1> 	jnb	short loc_move_mcfg_cmd_arguments
  5715                              <1> 	
  5716                              <1> loc_move_mcfg_cmd_arguments_ok:
  5717 0000AB65 C60700              <1> 	mov	byte [edi], 0
  5718                              <1>        
  5719                              <1> loc_mcfg_process_cmd_interpreter:
  5720 0000AB68 E825E0FFFF          <1> 	call    command_interpreter
  5721                              <1> 
  5722                              <1> loc_mcfg_ci_return_addr: 
  5723 0000AB6D A1[44820100]        <1> 	mov	eax, [MainProgCfg_FileSize]
  5724 0000AB72 89C2                <1> 	mov	edx, eax
  5725 0000AB74 8B35[48820100]      <1> 	mov	esi, [MainProgCfg_LineOffset]
  5726 0000AB7A 01F2                <1> 	add	edx, esi
  5727 0000AB7C 0305[6C8D0100]      <1> 	add	eax, [csftdf_sf_mem_addr]
  5728 0000AB82 29F0                <1> 	sub	eax, esi
  5729 0000AB84 0F873FFFFFFF        <1>         ja      loc_mcfg_process_next_line_check
  5730                              <1> 
  5731 0000AB8A E81D000000          <1> 	call	mcfg_deallocate_mem
  5732                              <1>  
  5733 0000AB8F B94F000000          <1>  	mov	ecx, 79 ; 80 ?
  5734 0000AB94 BF[06830100]        <1> 	mov	edi, CommandBuffer
  5735 0000AB99 30C0                <1> 	xor	al, al
  5736 0000AB9B F3AA                <1> 	rep	stosb
  5737                              <1> 
  5738                              <1> 	; 06/05/2016
  5739 0000AB9D BE[BF440100]        <1> 	mov	esi, nextline
  5740 0000ABA2 E89EC9FFFF          <1> 	call	print_msg
  5741 0000ABA7 E963D6FFFF          <1> 	jmp	dos_prompt
  5742                              <1> 
  5743                              <1> mcfg_deallocate_mem:
  5744 0000ABAC A1[6C8D0100]        <1> 	mov	eax, [csftdf_sf_mem_addr] ; start address
  5745 0000ABB1 8B0D[708D0100]      <1> 	mov	ecx, [csftdf_sf_mem_bsize] ; block size	
  5746                              <1> 	;call	deallocate_memory_block
  5747                              <1> 	;retn
  5748 0000ABB7 E9C4BAFFFF          <1> 	jmp	deallocate_memory_block
  5749                              <1> 
  5750                              <1> mcfg_read_file_sectors:
  5751                              <1> 	; 14/04/2016
  5752 0000ABBC 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  5753 0000ABC0 7669                <1>         jna	short mcfg_read_fs_file_sectors
  5754                              <1> 
  5755                              <1> mcfg_read_fat_file_sectors:
  5756                              <1> 	; return:
  5757                              <1> 	;   CF = 0 & EDX > 0 -> END OF FILE
  5758                              <1> 	;   CF = 0 & EDX = 0 -> not EOF
  5759                              <1> 	;   CF = 1 -> read error (error code in AL)	
  5760                              <1> 
  5761                              <1> mcfg_read_fat_file_secs_0:
  5762 0000ABC2 8B15[44820100]      <1> 	mov	edx, [MainProgCfg_FileSize]
  5763 0000ABC8 2B15[848D0100]      <1> 	sub	edx, [csftdf_sf_rbytes]
  5764 0000ABCE 3B15[7C8D0100]      <1> 	cmp	edx, [csftdf_r_size]	
  5765 0000ABD4 7306                <1> 	jnb	short mcfg_read_fat_file_secs_1
  5766 0000ABD6 8915[7C8D0100]      <1> 	mov	[csftdf_r_size], edx
  5767                              <1> 		
  5768                              <1> mcfg_read_fat_file_secs_1:
  5769 0000ABDC A1[7C8D0100]        <1> 	mov	eax, [csftdf_r_size]
  5770 0000ABE1 29D2                <1> 	sub	edx, edx
  5771 0000ABE3 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  5772 0000ABE7 01C8                <1> 	add	eax, ecx
  5773 0000ABE9 48                  <1> 	dec	eax
  5774 0000ABEA F7F1                <1> 	div	ecx
  5775 0000ABEC 89C1                <1> 	mov	ecx, eax ; sector count
  5776 0000ABEE A1[748D0100]        <1> 	mov	eax, [csftdf_sf_cluster]
  5777                              <1> 
  5778                              <1> 	; EBX = memory block address (current)
  5779                              <1> 	
  5780 0000ABF3 E88C230000          <1> 	call	read_fat_file_sectors
  5781 0000ABF8 7230                <1> 	jc	short mcfg_read_fat_file_secs_3
  5782                              <1> 
  5783                              <1> 	; EBX = next memory address
  5784                              <1> 
  5785 0000ABFA A1[848D0100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  5786 0000ABFF 0305[7C8D0100]      <1> 	add	eax, [csftdf_r_size]
  5787 0000AC05 8B15[44820100]      <1> 	mov	edx, [MainProgCfg_FileSize]
  5788 0000AC0B 39D0                <1> 	cmp	eax, edx
  5789 0000AC0D 731B                <1> 	jnb	short mcfg_read_fat_file_secs_3 ; edx > 0
  5790 0000AC0F A3[848D0100]        <1> 	mov	[csftdf_sf_rbytes], eax
  5791                              <1> 
  5792 0000AC14 53                  <1> 	push	ebx ; *
  5793                              <1> 	; get next cluster (csftdf_r_size! bytes)
  5794 0000AC15 A1[748D0100]        <1> 	mov	eax, [csftdf_sf_cluster]
  5795 0000AC1A E837210000          <1> 	call	get_next_cluster
  5796 0000AC1F 5B                  <1> 	pop	ebx ; *
  5797 0000AC20 7301                <1> 	jnc	short mcfg_read_fat_file_secs_2
  5798                              <1> 
  5799                              <1> 	;mov	eax, 17; Read error !
  5800 0000AC22 C3                  <1> 	retn
  5801                              <1> 
  5802                              <1> mcfg_read_fat_file_secs_2:
  5803 0000AC23 29D2                <1> 	sub	edx, edx ; 0
  5804 0000AC25 A3[748D0100]        <1> 	mov	[csftdf_sf_cluster], eax ; next cluster
  5805                              <1> 
  5806                              <1> mcfg_read_fat_file_secs_3:
  5807 0000AC2A C3                  <1> 	retn
  5808                              <1> 
  5809                              <1> mcfg_read_fs_file_sectors:
  5810 0000AC2B C3                  <1> 	retn
  5811                              <1> 
  5812                              <1> loc_mcfg_load_fs_file:
  5813 0000AC2C C3                  <1> 	retn
  5814                              <1> 
  5815                              <1> load_and_execute_file:
  5816                              <1> 	; 04/01/2017
  5817                              <1> 	; 06/05/2016, 07/05/2016, 11/05/2016
  5818                              <1> 	; 23/04/2016, 24/04/2016
  5819                              <1> 	; 22/04/2016 (TRDOS 386 = TRDOS v2.0)
  5820                              <1> 	; 05/11/2011 
  5821                              <1> 	; (TRDOS v1, CMDINTR.ASM, 'cmp_cmd_run', 'cmp_cmd_external')
  5822                              <1> 	; ('loc_run_check_filename')
  5823                              <1> 	; 29/08/2011
  5824                              <1> 	; 10/09/2011
  5825                              <1> 	; INPUT->
  5826                              <1> 	;	ESI = Path Name address (CommandBuffer address)
  5827                              <1> 	; OUTPUT ->
  5828                              <1> 	;	none (error message will be shown if an error will occur)
  5829                              <1> 	;
  5830                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI, EBP will be changed) 
  5831                              <1> 	;
  5832                              <1> loc_run_check_filename:
  5833 0000AC2D 803E20              <1> 	cmp	byte [esi], 20h
  5834 0000AC30 0F822BE3FFFF        <1> 	jb	loc_cmd_failed
  5835 0000AC36 7703                <1> 	ja	short loc_run_check_filename_ok
  5836 0000AC38 46                  <1> 	inc	esi
  5837 0000AC39 EBF2                <1> 	jmp	short loc_run_check_filename
  5838                              <1> 
  5839                              <1> loc_run_check_filename_ok:
  5840 0000AC3B C605[B7820100]00    <1> 	mov	byte [CmdArgStart], 0 ; reset
  5841 0000AC42 56                  <1> 	push	esi ; *
  5842                              <1> loc_run_get_first_arg_pos:
  5843 0000AC43 46                  <1> 	inc	esi
  5844 0000AC44 8A06                <1> 	mov	al, [esi]
  5845 0000AC46 3C20                <1> 	cmp	al, 20h
  5846 0000AC48 77F9                <1> 	ja	short loc_run_get_first_arg_pos
  5847 0000AC4A C60600              <1> 	mov	byte [esi], 0
  5848                              <1> loc_run_get_external_arg_pos:
  5849                              <1> 	; 11/05/2016
  5850 0000AC4D 46                  <1> 	inc	esi
  5851 0000AC4E 8A06                <1> 	mov	al, [esi]
  5852 0000AC50 3C20                <1> 	cmp	al, 20h
  5853 0000AC52 760C                <1> 	jna	short loc_run_parse_path_name
  5854 0000AC54 89F0                <1> 	mov	eax, esi
  5855 0000AC56 2D[06830100]        <1> 	sub	eax, CommandBuffer
  5856 0000AC5B A2[B7820100]        <1> 	mov	byte [CmdArgStart], al
  5857                              <1> loc_run_parse_path_name:
  5858 0000AC60 5E                  <1> 	pop	esi ; *
  5859 0000AC61 BF[F68A0100]        <1> 	mov	edi, FindFile_Drv
  5860 0000AC66 E8D7090000          <1> 	call	parse_path_name
  5861 0000AC6B 0F82F0E2FFFF        <1> 	jc	loc_cmd_failed
  5862                              <1> 
  5863                              <1> loc_run_check_filename_exists:
  5864 0000AC71 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  5865 0000AC76 803E20              <1> 	cmp	byte [esi], 20h
  5866 0000AC79 0F86E2E2FFFF        <1> 	jna	loc_cmd_failed
  5867                              <1> 
  5868                              <1> loc_run_check_exe_filename_ext:
  5869 0000AC7F E890020000          <1> 	call	check_prg_filename_ext
  5870 0000AC84 0F82D7E2FFFF        <1> 	jc	loc_cmd_failed
  5871                              <1> 	
  5872                              <1> loc_run_check_exe_filename_ext_ok:
  5873 0000AC8A 66A3[0E8E0100]      <1> 	mov	word [EXE_ID], ax
  5874                              <1> 
  5875                              <1> loc_run_drv:
  5876 0000AC90 C605[0D8E0100]00    <1> 	mov	byte [Run_Manual_Path], 0
  5877 0000AC97 A1[50820100]        <1> 	mov	eax, [Current_Dir_FCluster]
  5878 0000AC9C A3[088E0100]        <1>         mov     [Run_CDirFC], eax
  5879                              <1> 	;
  5880 0000ACA1 8A35[56820100]      <1> 	mov	dh, [Current_Drv]
  5881 0000ACA7 8835[B2890100]      <1> 	mov	[RUN_CDRV], dh
  5882                              <1> 
  5883 0000ACAD 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
  5884 0000ACB3 38F2                <1> 	cmp	dl, dh
  5885 0000ACB5 7412                <1> 	je	short loc_run_change_directory
  5886                              <1>                
  5887 0000ACB7 8005[0D8E0100]02    <1> 	add	byte [Run_Manual_Path], 2
  5888                              <1> 
  5889 0000ACBE E80BD4FFFF          <1> 	call	change_current_drive
  5890 0000ACC3 0F82C3E2FFFF        <1> 	jc	loc_run_cmd_failed
  5891                              <1> 
  5892                              <1> loc_run_change_directory:
  5893 0000ACC9 803D[F78A0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  5894 0000ACD0 7623                <1> 	jna	short loc_run_find_executable_file
  5895                              <1> 
  5896 0000ACD2 FE05[0D8E0100]      <1> 	inc	byte [Run_Manual_Path]
  5897                              <1>      
  5898 0000ACD8 FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  5899                              <1> 
  5900 0000ACDE BE[F78A0100]        <1> 	mov	esi, FindFile_Directory
  5901 0000ACE3 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  5902 0000ACE5 E842030000          <1> 	call	change_current_directory
  5903 0000ACEA 0F829CE2FFFF        <1> 	jc	loc_run_cmd_failed
  5904                              <1> 
  5905                              <1> loc_run_change_prompt_dir_string:
  5906 0000ACF0 E857020000          <1> 	call	change_prompt_dir_string
  5907                              <1> 
  5908                              <1> loc_run_find_executable_file:
  5909 0000ACF5 66C705[0C8E0100]00- <1> 	mov	word [Run_Auto_Path], 0
  5909 0000ACFD 00                  <1>
  5910                              <1> 
  5911                              <1> loc_run_find_executable_file_next:
  5912 0000ACFE BE[388B0100]        <1> 	mov	esi, FindFile_Name
  5913                              <1> loc_run_find_program_file_next:
  5914 0000AD03 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  5915 0000AD07 E865E7FFFF          <1> 	call	find_first_file
  5916                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
  5917                              <1> 	; EDI = Directory Buffer Directory Entry Location
  5918                              <1> 	; EAX = File size
  5919 0000AD0C 0F835C010000        <1> 	jnc	loc_load_and_run_file
  5920                              <1> 	 
  5921 0000AD12 3C02                <1> 	cmp	al, 2 ; file not found
  5922 0000AD14 0F8572E2FFFF        <1> 	jne	loc_run_cmd_failed
  5923                              <1> 
  5924 0000AD1A 66A1[0E8E0100]      <1> 	mov	ax, word [EXE_ID]
  5925 0000AD20 80FC2E              <1> 	cmp	ah, '.' ; File name has extension sign
  5926 0000AD23 7424                <1> 	je	short loc_run_check_auto_path
  5927                              <1> 
  5928 0000AD25 08C0                <1> 	or	al, al
  5929 0000AD27 7520                <1> 	jnz	short loc_run_check_auto_path
  5930                              <1> 
  5931 0000AD29 80FC08              <1> 	cmp	ah, 8 ; count of file name chars
  5932 0000AD2C 771B                <1> 	ja	short loc_run_check_auto_path
  5933                              <1> 
  5934                              <1> loc_run_change_file_ext_to_prg:
  5935 0000AD2E 0FB6DC              <1> 	movzx	ebx, ah ; count of file name chars
  5936 0000AD31 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  5937 0000AD36 01F3                <1> 	add	ebx, esi	
  5938                              <1> 	; 07/05/2016
  5939 0000AD38 C7032E505247        <1> 	mov	dword [ebx],  '.PRG'
  5940 0000AD3E 66C705[0E8E0100]50- <1> 	mov	word [EXE_ID], 'P.'
  5940 0000AD46 2E                  <1>
  5941 0000AD47 EBBA                <1> 	jmp	short loc_run_find_program_file_next	
  5942                              <1> 
  5943                              <1> loc_run_check_auto_path:
  5944                              <1> 	; NOTE: /// 07/05/2016 ///
  5945                              <1> 	; If the path is given, value of byte [Run_Manual_Path]
  5946                              <1> 	; will not be ZERO. If so, file searching by using
  5947                              <1> 	; Automatic Path (via 'PATH' environment variable)
  5948                              <1> 	; will not be applicable, because the program file 
  5949                              <1> 	; is already/absolutely not found.
  5950                              <1> 
  5951 0000AD49 A0[0D8E0100]        <1> 	mov	al, [Run_Manual_Path]
  5952 0000AD4E 08C0                <1> 	or	al, al
  5953 0000AD50 0F850BE2FFFF        <1> 	jnz	loc_cmd_failed
  5954                              <1> 
  5955                              <1> loc_run_check_auto_path_again:
  5956 0000AD56 66833D[0C8E0100]FF  <1> 	cmp	word [Run_Auto_Path], 0FFFFh		 
  5957                              <1> 		; 0FFFFh = Not a valid run path (in ENV block) 
  5958 0000AD5E 0F83FDE1FFFF        <1> 	jnb	loc_cmd_failed
  5959                              <1> 	; xor	al, al 
  5960 0000AD64 BE[EF380100]        <1> 	mov	esi, Cmd_Path ; 'PATH'
  5961 0000AD69 BF[56830100]        <1> 	mov	edi, TextBuffer
  5962 0000AD6E E848F9FFFF          <1> 	call	get_environment_string
  5963 0000AD73 730E                <1> 	jnc	short loc_run_chk_filename_ext_again
  5964 0000AD75 66C705[0C8E0100]FF- <1> 	mov	word [Run_Auto_Path], 0FFFFh ; invalid
  5964 0000AD7D FF                  <1>
  5965 0000AD7E E9DEE1FFFF          <1> 	jmp	loc_cmd_failed
  5966                              <1> 
  5967                              <1> loc_run_chk_filename_ext_again:
  5968 0000AD83 89C1                <1> 	mov	ecx, eax ; string length (with zero tail)
  5969 0000AD85 49                  <1> 	dec	ecx ; without zero tail
  5970 0000AD86 66A1[0E8E0100]      <1> 	mov	ax, [EXE_ID]
  5971 0000AD8C 80FC2E              <1> 	cmp	ah, '.'
  5972 0000AD8F 740E                <1> 	je	short loc_run_chk_auto_path_pos
  5973                              <1> 	 
  5974                              <1> loc_run_change_file_ext_to_noext_again:
  5975 0000AD91 0FB6DC              <1> 	movzx	ebx, ah
  5976 0000AD94 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  5977 0000AD99 01F3                <1> 	add 	ebx, esi
  5978 0000AD9B 29C0                <1> 	sub	eax, eax
  5979 0000AD9D 8903                <1> 	mov	[ebx], eax ; 0 ; erase extension (.PRG)
  5980                              <1> 
  5981                              <1> loc_run_chk_auto_path_pos:
  5982                              <1> 	;movzx	eax,  word [Run_Auto_Path]
  5983 0000AD9F 66A1[0C8E0100]      <1> 	mov	ax, [Run_Auto_Path]
  5984 0000ADA5 39C8                <1> 	cmp	eax, ecx ; ecx = string length (except zero tail)
  5985 0000ADA7 0F83B4E1FFFF        <1> 	jnb	loc_cmd_failed
  5986                              <1> 	;or	eax, eax
  5987 0000ADAD 6609C0              <1> 	or	ax, ax
  5988 0000ADB0 7502                <1> 	jnz	short loc_run_auto_path_pos_move
  5989 0000ADB2 B005                <1> 	mov	al, 5
  5990                              <1> 
  5991                              <1> loc_run_auto_path_pos_move:
  5992 0000ADB4 89FE                <1> 	mov	esi, edi ; offset TextBuffer
  5993 0000ADB6 01C6                <1> 	add	esi, eax
  5994                              <1> 
  5995                              <1> loc_run_auto_path_pos_space_loop:
  5996 0000ADB8 AC                  <1> 	lodsb
  5997 0000ADB9 3C20                <1> 	cmp	al, 20h 
  5998 0000ADBB 74FB                <1> 	je	short loc_run_auto_path_pos_space_loop
  5999 0000ADBD 0F829EE1FFFF        <1> 	jb	loc_cmd_failed 
  6000 0000ADC3 AA                  <1> 	stosb
  6001                              <1> loc_run_auto_path_pos_move_next: 
  6002 0000ADC4 AC                  <1> 	lodsb
  6003 0000ADC5 3C3B                <1> 	cmp	al, ';'
  6004 0000ADC7 7414                <1> 	je	short loc_run_auto_path_pos_move_last_byte
  6005 0000ADC9 3C20                <1> 	cmp	al, 20h
  6006 0000ADCB 74F7                <1> 	je	short loc_run_auto_path_pos_move_next
  6007 0000ADCD 7203                <1> 	jb	short loc_byte_ptr_end_of_path
  6008 0000ADCF AA                  <1> 	stosb
  6009 0000ADD0 EBF2                <1> 	jmp	short loc_run_auto_path_pos_move_next 
  6010                              <1> 
  6011                              <1> loc_byte_ptr_end_of_path: 
  6012 0000ADD2 66C705[0C8E0100]FF- <1> 	mov	word [Run_Auto_Path], 0FFFFh ; end of path
  6012 0000ADDA FF                  <1>
  6013 0000ADDB EB0D                <1> 	jmp	short loc_run_auto_path_move_ok 
  6014                              <1> 
  6015                              <1> loc_run_auto_path_pos_move_last_byte:
  6016 0000ADDD 89F0                <1> 	mov	eax, esi
  6017 0000ADDF 2D[56830100]        <1> 	sub	eax, TextBuffer 
  6018 0000ADE4 66A3[0C8E0100]      <1> 	mov	[Run_Auto_Path], ax ; next path position
  6019                              <1> 
  6020                              <1> loc_run_auto_path_move_ok:
  6021 0000ADEA 4F                  <1> 	dec	edi
  6022 0000ADEB B02F                <1> 	mov	al, '/'
  6023 0000ADED 3807                <1> 	cmp	[edi], al
  6024 0000ADEF 7403                <1> 	je	short loc_run_auto_path_move_file_name
  6025 0000ADF1 47                  <1> 	inc	edi
  6026 0000ADF2 8807                <1> 	mov	[edi], al
  6027                              <1> 
  6028                              <1> loc_run_auto_path_move_file_name:
  6029 0000ADF4 47                  <1> 	inc	edi   
  6030 0000ADF5 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  6031                              <1> 
  6032                              <1> loc_run_auto_path_move_fn_loop:
  6033 0000ADFA AC                  <1> 	lodsb
  6034 0000ADFB AA                  <1> 	stosb
  6035 0000ADFC 08C0                <1> 	or	al, al
  6036 0000ADFE 75FA                <1> 	jnz	short loc_run_auto_path_move_fn_loop
  6037                              <1> 
  6038 0000AE00 BE[56830100]        <1> 	mov	esi, TextBuffer
  6039 0000AE05 BF[F68A0100]        <1> 	mov	edi, FindFile_Drv
  6040 0000AE0A E833080000          <1> 	call	parse_path_name
  6041 0000AE0F 0F824CE1FFFF        <1> 	jc	loc_cmd_failed
  6042                              <1> 
  6043 0000AE15 8A35[56820100]      <1> 	mov	dh, [Current_Drv]
  6044 0000AE1B 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
  6045 0000AE21 38F2                <1> 	cmp	dl, dh
  6046 0000AE23 740B                <1> 	je	short loc_run_change_directory_again
  6047                              <1>                
  6048 0000AE25 E8A4D2FFFF          <1> 	call	change_current_drive
  6049 0000AE2A 0F825CE1FFFF        <1> 	jc	loc_run_cmd_failed
  6050                              <1> 
  6051                              <1> loc_run_change_directory_again:
  6052 0000AE30 803D[F78A0100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  6053 0000AE37 761D                <1> 	jna	short loc_load_executable_cdir_chk_again
  6054                              <1> 
  6055 0000AE39 FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  6056 0000AE3F BE[F78A0100]        <1> 	mov	esi, FindFile_Directory
  6057 0000AE44 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  6058 0000AE46 E8E1010000          <1> 	call	change_current_directory
  6059 0000AE4B 0F823BE1FFFF        <1> 	jc	loc_run_cmd_failed
  6060                              <1> 
  6061                              <1> loc_run_chg_prompt_dir_str_again:
  6062 0000AE51 E8F6000000          <1> 	call	change_prompt_dir_string
  6063                              <1> 
  6064                              <1> loc_load_executable_cdir_chk_again:
  6065 0000AE56 A1[50820100]        <1> 	mov	eax, [Current_Dir_FCluster]
  6066 0000AE5B 3B05[088E0100]      <1> 	cmp	eax, [Run_CDirFC]
  6067 0000AE61 0F8597FEFFFF        <1> 	jne	loc_run_find_executable_file_next
  6068 0000AE67 30C0                <1> 	xor	al, al ; 0
  6069 0000AE69 E9E8FEFFFF          <1> 	jmp	loc_run_check_auto_path_again
  6070                              <1> 
  6071                              <1> loc_load_and_run_file:
  6072                              <1> 	; 13/11/2017
  6073                              <1> 	; 04/01/2017
  6074                              <1> 	; 23/04/2016
  6075 0000AE6E BE[388B0100]        <1> 	mov	esi, FindFile_Name
  6076 0000AE73 BF[56830100]        <1> 	mov	edi, TextBuffer
  6077                              <1> 
  6078                              <1>  	; 24/04/2016
  6079 0000AE78 31D2                <1> 	xor	edx, edx
  6080 0000AE7A 668915[4A040300]    <1> 	mov	word [argc], dx ; 0
  6081 0000AE81 8915[8C030300]      <1> 	mov	dword [u.nread], edx ; 0
  6082                              <1> 
  6083                              <1> loc_load_and_run_file_1:
  6084 0000AE87 AC                  <1> 	lodsb	
  6085 0000AE88 AA                  <1> 	stosb
  6086 0000AE89 FF05[8C030300]      <1> 	inc	dword [u.nread]
  6087 0000AE8F 20C0                <1> 	and	al, al
  6088 0000AE91 75F4                <1> 	jnz 	short loc_load_and_run_file_1
  6089                              <1> 	
  6090 0000AE93 A0[B7820100]        <1> 	mov	al, [CmdArgStart]
  6091 0000AE98 20C0                <1> 	and	al, al
  6092 0000AE9A 7445                <1> 	jz	short loc_load_and_run_file_7
  6093                              <1> 
  6094 0000AE9C 0FB6F0              <1> 	movzx	esi, al ; 11/05/2016
  6095 0000AE9F B950000000          <1> 	mov	ecx, 80
  6096 0000AEA4 29F1                <1> 	sub	ecx, esi
  6097 0000AEA6 81C6[06830100]      <1> 	add	esi, CommandBuffer
  6098                              <1> 
  6099 0000AEAC 66FF05[4A040300]    <1> 	inc	word [argc] ; 11/05/2016
  6100                              <1> 
  6101                              <1> loc_load_and_run_file_2:
  6102 0000AEB3 AC                  <1> 	lodsb
  6103 0000AEB4 3C20                <1> 	cmp	al, 20h
  6104 0000AEB6 7717                <1> 	ja	short loc_load_and_run_file_5	
  6105 0000AEB8 721E                <1> 	jb	short loc_load_and_run_file_6
  6106                              <1> 
  6107                              <1> loc_load_and_run_file_3:
  6108 0000AEBA 803E20              <1> 	cmp	byte [esi], 20h
  6109 0000AEBD 7707                <1> 	ja	short loc_load_and_run_file_4
  6110 0000AEBF 7217                <1> 	jb	short loc_load_and_run_file_6
  6111 0000AEC1 46                  <1> 	inc	esi
  6112 0000AEC2 E2F6                <1> 	loop	loc_load_and_run_file_3
  6113 0000AEC4 EB12                <1> 	jmp	short loc_load_and_run_file_6
  6114                              <1> 
  6115                              <1> loc_load_and_run_file_4:
  6116 0000AEC6 28C0                <1> 	sub	al, al ; 0
  6117 0000AEC8 66FF05[4A040300]    <1> 	inc	word [argc]
  6118                              <1> loc_load_and_run_file_5:
  6119 0000AECF AA                  <1> 	stosb
  6120 0000AED0 FF05[8C030300]      <1> 	inc	dword [u.nread]
  6121 0000AED6 E2DB                <1> 	loop	loc_load_and_run_file_2
  6122                              <1> 			
  6123                              <1> loc_load_and_run_file_6:
  6124 0000AED8 30C0                <1> 	xor	al, al ; 0
  6125 0000AEDA AA                  <1> 	stosb
  6126 0000AEDB FF05[8C030300]      <1> 	inc	dword [u.nread]
  6127                              <1> loc_load_and_run_file_7:
  6128 0000AEE1 8807                <1> 	mov 	[edi], al ; 0
  6129 0000AEE3 66FF05[4A040300]    <1> 	inc	word [argc] ; 24/04/2016
  6130 0000AEEA FF05[8C030300]      <1> 	inc	dword [u.nread] ; 24/04/2016
  6131 0000AEF0 BE[56830100]        <1> 	mov	esi, TextBuffer
  6132 0000AEF5 8B15[648B0100]      <1> 	mov	edx, [FindFile_DirEntry+DirEntry_FileSize]
  6133 0000AEFB 66A1[5C8B0100]      <1> 	mov	ax, [FindFile_DirEntry+DirEntry_FstClusHI]
  6134 0000AF01 C1E010              <1> 	shl	eax, 16 ; 13/11/2017
  6135 0000AF04 66A1[628B0100]      <1> 	mov	ax, [FindFile_DirEntry+DirEntry_FstClusLO]
  6136                              <1> 	; EAX = First Cluster number
  6137                              <1> 	; EDX = File Size
  6138                              <1> 	; ESI = Argument list address
  6139                              <1> 	; [argc] = argument count
  6140                              <1> 	; [u.nread] = argument list length
  6141 0000AF0A E8DA5B0000          <1> 	call	load_and_run_file ; trdosk6.s
  6142                              <1>         ;jc	loc_run_cmd_failed ; 04/01/2017
  6143                              <1> loc_load_and_run_file_8: ; 06/05/2016
  6144 0000AF0F E98BE9FFFF          <1> 	jmp	loc_file_rw_restore_retn
  6145                              <1> 
  6146                              <1> check_prg_filename_ext:
  6147                              <1> 	; 23/04/2016 (TRDOS 386 = TRDOS v2.0)
  6148                              <1> 	; 10/09/2011 
  6149                              <1> 	; (TRDOS v1, CMDINTR.ASM, 'proc_check_exe_filename_ext')
  6150                              <1> 	; 14/11/2009
  6151                              <1> 	; INPUT -> 
  6152                              <1> 	;	ESI = Dot File Name
  6153                              <1> 	; OUTPUT ->
  6154                              <1> 	;     cf = 0 -> EXE_ID in AL
  6155                              <1> 	;	ESI = Last char + 1 position
  6156                              <1> 	;     cf = 1 -> Invalid executable file name
  6157                              <1> 	;	or no file name extension if AH<=8
  6158                              <1> 	;	AL = Last file name char     
  6159                              <1> 	;     cf = 0 -> AL='P' (PRG), AL=0 (no extension)
  6160                              <1> 	;
  6161                              <1> 	; (Modified registers: EAX, ESI)
  6162                              <1>   
  6163 0000AF14 30E4                <1> 	xor	ah, ah
  6164                              <1> loc_run_check_filename_ext:	
  6165 0000AF16 AC                  <1> 	lodsb
  6166 0000AF17 3C21                <1> 	cmp	al, 21h
  6167 0000AF19 7229                <1> 	jb	short loc_check_exe_fn_retn 
  6168 0000AF1B FEC4                <1> 	inc	ah
  6169 0000AF1D 3C2E                <1> 	cmp	al, '.'
  6170 0000AF1F 75F5                <1> 	jne	short loc_run_check_filename_ext	
  6171                              <1> 		 
  6172                              <1> loc_run_check_filename_ext_dot:
  6173 0000AF21 80FC02              <1> 	cmp	ah, 2 ; .??? is not valid
  6174 0000AF24 88C4                <1> 	mov	ah, al ; '.' 
  6175 0000AF26 7219                <1> 	jb	short loc_check_prg_fn_retn
  6176                              <1> 
  6177                              <1> loc_run_check_filename_ext_dot_ok:
  6178 0000AF28 AC                  <1> 	lodsb
  6179 0000AF29 24DF                <1> 	and	al, 0DFh 
  6180                              <1> 
  6181                              <1> loc_run_check_filename_ext_prg:
  6182 0000AF2B 3C50                <1> 	cmp	al, 'P'
  6183 0000AF2D 7212                <1> 	jb	short loc_check_prg_fn_retn
  6184 0000AF2F 7711                <1> 	ja	short loc_check_prg_fn_stc
  6185 0000AF31 AC                  <1> 	lodsb
  6186 0000AF32 24DF                <1> 	and	al, 0DFh 
  6187 0000AF34 3C52                <1> 	cmp	al, 'R'
  6188 0000AF36 750A                <1> 	jne	short loc_check_prg_fn_stc
  6189 0000AF38 AC                  <1> 	lodsb
  6190 0000AF39 24DF                <1> 	and	al, 0DFh
  6191 0000AF3B 3C47                <1> 	cmp	al, 'G'
  6192 0000AF3D 7503                <1> 	jne	short loc_check_prg_fn_stc
  6193                              <1> 
  6194 0000AF3F B050                <1> 	mov	al, 'P'
  6195                              <1> loc_check_prg_fn_retn:
  6196 0000AF41 C3                  <1> 	retn
  6197                              <1> 
  6198                              <1> loc_check_prg_fn_stc:
  6199 0000AF42 F9                  <1> 	stc
  6200 0000AF43 C3                  <1> 	retn
  6201                              <1>  
  6202                              <1> loc_check_exe_fn_retn:
  6203 0000AF44 28C0                <1> 	sub	al, al ; 0
  6204 0000AF46 C3                  <1> 	retn
  6205                              <1>               
  6206                              <1> find_and_list_files:
  6207 0000AF47 C3                  <1> 	retn
  6208                              <1> set_exec_arguments:
  6209 0000AF48 C3                  <1> 	retn
  6210                              <1> delete_fs_directory:
  6211 0000AF49 31C0                <1> 	xor eax, eax
  6212 0000AF4B C3                  <1> 	retn
  3082                                  %include 'trdosk4.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - Directory Functions : trdosk4.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 29/12/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; DIR.ASM (09/10/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> 
    14                              <1> ; DIR.ASM  [ TRDOS KERNEL - COMMAND EXECUTER SECTION - DIRECTORY FUNCTIONS ]
    15                              <1> ; (c) 2004-2010  Erdogan TAN  [ 17/01/2004 ]  Last Update: 09/10/2011
    16                              <1> ; FILE.ASM [ FILE FUNCTIONS ] Last Update: 09/10/2011
    17                              <1> 
    18                              <1> change_prompt_dir_string:
    19                              <1> 	; 05/10/2016
    20                              <1> 	; 24/01/2016 (TRDOS 386 = TRDOS v2.0)
    21                              <1> 	; 27/03/2011
    22                              <1> 	; 09/10/2009
    23                              <1> 	; INPUT/OUTPUT => none
    24                              <1> 	; this procedure changes current directory string/text  
    25                              <1> 	; 2005
    26                              <1> 
    27 0000AF4C BE[B3890100]        <1> 	mov	esi, PATH_Array
    28                              <1> change_prompt_dir_str: ; 05/10/2016 (call from 'set_working_path')
    29 0000AF51 BF[5A820100]        <1> 	mov	edi, Current_Directory
    30 0000AF56 8A25[54820100]      <1> 	mov	ah, [Current_Dir_Level]
    31 0000AF5C E807000000          <1> 	call	set_current_directory_string
    32 0000AF61 880D[B5820100]      <1> 	mov	[Current_Dir_StrLen], cl
    33                              <1> 
    34 0000AF67 C3                  <1> 	retn
    35                              <1> 
    36                              <1> set_current_directory_string:
    37                              <1> 	; 24/01/2016 (TRDOS 386 = TRDOS v2.0)
    38                              <1> 	; 27/03/2011
    39                              <1> 	; 09/10/2009
    40                              <1> 	; INPUT:
    41                              <1> 	;    ESI = Path Array Address 
    42                              <1> 	;    EDI = Current Directory String Buffer
    43                              <1> 	;    AH = Current Directory Level
    44                              <1> 	; OUTPUT => EAX, EBX, ESI will be changed
    45                              <1> 	;    EDI will be same with input
    46                              <1> 	;    ECX = Current Directory String Length 
    47                              <1> 
    48 0000AF68 57                  <1> 	push    edi
    49 0000AF69 80FC00              <1> 	cmp     ah, 0
    50 0000AF6C 7652                <1> 	jna	short pass_write_path
    51 0000AF6E 83C610              <1> 	add	esi, 16
    52 0000AF71 89F3                <1> 	mov	ebx, esi
    53                              <1> loc_write_path:
    54 0000AF73 B908000000          <1> 	mov	ecx, 8
    55                              <1> path_write_dirname1:
    56 0000AF78 AC                  <1> 	lodsb
    57 0000AF79 3C20                <1> 	cmp	al, 20h
    58 0000AF7B 7612                <1> 	jna	short pass_write_dirname1
    59 0000AF7D AA                  <1> 	stosb
    60 0000AF7E 81FF[B4820100]      <1> 	cmp	edi, End_Of_Current_Dir_Str
    61 0000AF84 733A                <1> 	jnb	short pass_write_path
    62 0000AF86 E2F0                <1> 	loop	path_write_dirname1
    63 0000AF88 803E20              <1> 	cmp	byte [esi], 20h
    64 0000AF8B 7624                <1> 	jna	short pass_write_dirname2
    65 0000AF8D EB0A                <1> 	jmp     short loc_put_dot_cont_ext
    66                              <1> pass_write_dirname1:
    67 0000AF8F 89DE                <1> 	mov	esi, ebx
    68 0000AF91 83C608              <1> 	add	esi, 8
    69 0000AF94 803E20              <1> 	cmp	byte [esi], 20h
    70 0000AF97 7618                <1> 	jna	short pass_write_dirname2
    71                              <1> loc_put_dot_cont_ext:
    72 0000AF99 C6072E              <1> 	mov	byte [edi], "."
    73                              <1> 	;mov	ecx, 3
    74 0000AF9C B103                <1> 	mov	cl, 3
    75                              <1> loc_check_dir_name_ext:
    76 0000AF9E AC                  <1> 	lodsb
    77 0000AF9F 47                  <1> 	inc	edi
    78 0000AFA0 3C20                <1> 	cmp	al, 20h
    79 0000AFA2 760D                <1> 	jna	short pass_write_dirname2
    80 0000AFA4 8807                <1> 	mov	[edi], al
    81 0000AFA6 81FF[B4820100]      <1> 	cmp	edi, End_Of_Current_Dir_Str
    82 0000AFAC 7312                <1> 	jnb	short pass_write_path
    83 0000AFAE E2EE                <1> 	loop    loc_check_dir_name_ext
    84 0000AFB0 47                  <1> 	inc	edi
    85                              <1> pass_write_dirname2:
    86 0000AFB1 FECC                <1> 	dec	ah
    87 0000AFB3 740B                <1> 	jz      short pass_write_path
    88 0000AFB5 83C310              <1> 	add	ebx, 16
    89 0000AFB8 89DE                <1> 	mov	esi, ebx
    90 0000AFBA C6072F              <1> 	mov	byte [edi],"/"
    91 0000AFBD 47                  <1> 	inc	edi
    92 0000AFBE EBB3                <1> 	jmp	short loc_write_path
    93                              <1> pass_write_path:
    94 0000AFC0 C60700              <1> 	mov	byte [edi], 0
    95 0000AFC3 47                  <1> 	inc	edi
    96 0000AFC4 89F9                <1> 	mov	ecx, edi
    97 0000AFC6 5F                  <1> 	pop	edi
    98 0000AFC7 29F9                <1> 	sub	ecx, edi
    99                              <1> 	; ECX = Current Directory String Length
   100 0000AFC9 C3                  <1> 	retn
   101                              <1> 
   102                              <1> get_current_directory:
   103                              <1> 	; 15/10/2016
   104                              <1> 	; 14/02/2016
   105                              <1> 	; 24/01/2016 (TRDOS 386 = TRDOS v2.0)
   106                              <1> 	; 27/03/2011
   107                              <1> 	;
   108                              <1> 	; INPUT-> ESI = Current Directory Buffer
   109                              <1> 	;         DL = TRDOS Logical Dos Drive Number + 1
   110                              <1> 	;              (0= Default/Current Drive)
   111                              <1> 	;           
   112                              <1> 	;   Note: Required dir buffer length may be <= 92 bytes
   113                              <1> 	;         for TRDOS (7*12 name chars + 7 slash + 0)
   114                              <1> 	; OUTPUT ->  ESI = Current Directory Buffer
   115                              <1> 	;            EAX, EBX, ECX, EDX, EDI will be changed
   116                              <1> 	;            CX/CL = Current Directory String Length
   117                              <1> 	;	     DL = Drive Number (0 based)
   118                              <1> 	;            (If input is 0, output is current drv number) 
   119                              <1> 	;            DH = same with input 
   120                              <1> 	;   cf = 0 -> AL = 0
   121                              <1> 	;   cf = 1 -> error code in AL 
   122                              <1>               
   123                              <1> loc_get_current_drive_0:
   124 0000AFCA 80FA00              <1> 	cmp	dl, 0
   125 0000AFCD 7708                <1> 	ja	short loc_get_current_drive_1
   126 0000AFCF 8A15[56820100]      <1> 	mov	dl, [Current_Drv]
   127 0000AFD5 EB17                <1> 	jmp	short loc_get_current_drive_2
   128                              <1> loc_get_current_drive_1:
   129 0000AFD7 FECA                <1> 	dec 	dl
   130 0000AFD9 3A15[22380100]      <1> 	cmp	dl, [Last_DOS_DiskNo]
   131 0000AFDF 760D                <1> 	jna	short loc_get_current_drive_2
   132 0000AFE1 B80F000000          <1> 	mov	eax, 0Fh ; Invalid drive (Drive not ready!)
   133 0000AFE6 F5                  <1> 	cmc 	; stc
   134 0000AFE7 C3                  <1> 	retn
   135                              <1> 
   136                              <1> loc_get_current_drive_not_ready_retn:
   137 0000AFE8 5E                  <1> 	pop	esi
   138                              <1> 	;mov	eax, 15
   139 0000AFE9 66B80F00            <1> 	mov	ax, 15 ; Drive not ready
   140 0000AFED C3                  <1> 	retn  
   141                              <1>  
   142                              <1> loc_get_current_drive_2:
   143 0000AFEE 31C0                <1> 	xor	eax, eax
   144 0000AFF0 88D4                <1> 	mov	ah, dl
   145 0000AFF2 56                  <1> 	push	esi
   146 0000AFF3 BE00010900          <1> 	mov	esi, Logical_DOSDisks
   147 0000AFF8 01C6                <1> 	add	esi, eax
   148 0000AFFA 8A06                <1> 	mov	al, [esi+LD_Name] 
   149 0000AFFC 3C41                <1> 	cmp	al, 'A'
   150 0000AFFE 72E8                <1> 	jb	short loc_get_current_drive_not_ready_retn
   151                              <1> 
   152 0000B000 8A667F              <1> 	mov	ah, [esi+LD_CDirLevel]
   153 0000B003 08E4                <1> 	or	ah, ah
   154 0000B005 7506                <1> 	jnz	short loc_get_current_drive_3
   155                              <1> 
   156                              <1> 	;xor	ah, ah ; mov ah, 0
   157 0000B007 8826                <1> 	mov	[esi], ah
   158 0000B009 31C9                <1> 	xor	ecx, ecx
   159 0000B00B EB1C                <1> 	jmp	short loc_get_current_drive_4
   160                              <1> 
   161                              <1> loc_get_current_drive_3:
   162 0000B00D BF[B3890100]        <1>         mov     edi, PATH_Array
   163 0000B012 57                  <1> 	push	edi
   164 0000B013 81C680000000        <1> 	add	esi, LD_CurrentDirectory
   165 0000B019 B920000000          <1> 	mov	ecx, 32
   166 0000B01E F3A5                <1> 	rep	movsd
   167 0000B020 5E                  <1> 	pop	esi ; Path Array Address
   168 0000B021 5F                  <1> 	pop	edi ; pushed esi (current dir buffer offset) 
   169                              <1> 	;
   170 0000B022 E841FFFFFF          <1> 	call	set_current_directory_string
   171 0000B027 89FE                <1> 	mov	esi, edi
   172                              <1> 
   173                              <1> loc_get_current_drive_4:
   174 0000B029 30C0                <1> 	xor	al, al
   175 0000B02B C3                  <1> 	retn
   176                              <1> 
   177                              <1> change_current_directory:
   178                              <1> 	; 19/02/2016
   179                              <1> 	; 11/02/2016
   180                              <1> 	; 10/02/2016
   181                              <1> 	; 08/02/2016
   182                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
   183                              <1> 	; 18/09/2011 (DIR.ASM, 09/10/2011)	
   184                              <1> 	; 04/10/2009
   185                              <1> 	; 2005
   186                              <1> 	; INPUT -> 
   187                              <1> 	;	ESI = Directory string
   188                              <1> 	;	ah = CD command (CDh = save current dir string)
   189                              <1> 	; OUTPUT -> 
   190                              <1> 	; 	EDI = DOS Drive Description Table
   191                              <1> 	; 	cf = 1 -> error
   192                              <1> 	;	   EAX = Error code
   193                              <1> 	;	cf = 0 -> successful
   194                              <1> 	;	   ESI = PATH_Array
   195                              <1> 	;	   EAX = Current Directory First Cluster
   196                              <1> 	;
   197                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI will be changed)
   198                              <1> 	
   199 0000B02C 8825[418A0100]      <1> 	mov	[CD_COMMAND], ah
   200 0000B032 803E2F              <1> 	cmp	byte [esi], '/'
   201 0000B035 7505                <1> 	jne	short loc_ccd_cdir_level
   202 0000B037 46                  <1> 	inc	esi
   203 0000B038 30C0                <1> 	xor	al, al
   204 0000B03A EB05                <1> 	jmp	short loc_ccd_parse_path_name
   205                              <1> loc_ccd_cdir_level:
   206 0000B03C A0[54820100]        <1> 	mov	al, [Current_Dir_Level]
   207                              <1> loc_ccd_parse_path_name:
   208 0000B041 88C4                <1> 	mov	ah, al
   209 0000B043 BF[B3890100]        <1> 	mov	edi, PATH_Array
   210                              <1> 
   211                              <1> ; Reset directory levels > cdir level
   212                              <1> 	; is this required !?
   213                              <1> 	;
   214                              <1> 	; Relations:
   215                              <1> 	; MAINPROG.ASM (pass_ccdrv_reset_cdir_FAT_fcluster)
   216                              <1> 	; proc_parse_dir_name,
   217                              <1> 	; proc_change_current_directory (this procedure)
   218                              <1> 	; proc_change_prompt_dir_string 
   219                              <1>  
   220 0000B048 0FB6C8              <1> 	movzx	ecx, al
   221 0000B04B FEC1                <1> 	inc	cl
   222 0000B04D C0E104              <1> 	shl	cl, 4
   223 0000B050 01CF                <1> 	add	edi, ecx
   224 0000B052 B107                <1> 	mov	cl, 7
   225 0000B054 28C1                <1> 	sub	cl, al
   226 0000B056 C0E102              <1> 	shl	cl, 2
   227 0000B059 89C3                <1> 	mov	ebx, eax
   228 0000B05B 31C0                <1> 	xor	eax, eax ; 0
   229 0000B05D F3AB                <1> 	rep	stosd
   230 0000B05F 89D8                <1> 	mov	eax, ebx
   231                              <1> 
   232 0000B061 BF[B3890100]        <1> 	mov	edi, PATH_Array
   233                              <1> 
   234 0000B066 803E20              <1> 	cmp	byte [esi], 20h
   235 0000B069 F5                  <1> 	cmc
   236 0000B06A 7305                <1> 	jnc	short pass_ccd_parse_dir_name
   237                              <1> 
   238                              <1> 		; ESI = Path name
   239                              <1> 		; AL = CCD_Level
   240 0000B06C E872010000          <1>         call    parse_dir_name
   241                              <1> 		; AL = CCD_Level 
   242                              <1> 		; AH = Last_Dir_Level
   243                              <1> 		; (EDI = PATH_Array)
   244                              <1> 
   245                              <1> pass_ccd_parse_dir_name:
   246 0000B071 9C                  <1> 	pushf
   247                              <1> 
   248                              <1> 	;mov	[CCD_Level], al
   249                              <1>         ;mov	[Last_Dir_Level], ah
   250 0000B072 66A3[378A0100]      <1> 	mov	[CCD_Level], ax
   251                              <1> 
   252 0000B078 31DB                <1> 	xor	ebx, ebx
   253 0000B07A 8A3D[56820100]      <1> 	mov	bh, [Current_Drv]
   254 0000B080 BE00010900          <1> 	mov	esi, Logical_DOSDisks
   255 0000B085 01DE                <1> 	add	esi, ebx
   256                              <1> 
   257 0000B087 9D                  <1> 	popf 
   258 0000B088 720A                <1> 	jc	short loc_ccd_bad_path_name_retn
   259                              <1> 
   260 0000B08A 8935[338A0100]      <1> 	mov	[CCD_DriveDT], esi
   261                              <1> 
   262 0000B090 3C07                <1> 	cmp	al, 7
   263 0000B092 7209                <1> 	jb	short loc_ccd_load_child_dir
   264                              <1> 
   265                              <1> loc_ccd_bad_path_name_retn:
   266 0000B094 87F7                <1> 	xchg	esi, edi
   267 0000B096 B813000000          <1> 	mov	eax, 19 ; Bad directory/path name 
   268 0000B09B F9                  <1> 	stc
   269                              <1> loc_ccd_retn_p:
   270 0000B09C C3                  <1> 	retn
   271                              <1> 
   272                              <1> loc_ccd_load_child_dir:
   273                              <1> 	; AL = CCD_Level
   274 0000B09D 08C0                <1> 	or	al, al
   275 0000B09F 7468                <1> 	jz	short loc_ccd_load_root_dir
   276                              <1> 
   277 0000B0A1 6689C1              <1> 	mov	cx, ax
   278 0000B0A4 C0E004              <1> 	shl	al, 4
   279 0000B0A7 0FB6F0              <1> 	movzx	esi, al
   280 0000B0AA 01FE                <1>      	add	esi, edi  ; offset PATH_Array
   281                              <1> 
   282 0000B0AC 8B460C              <1> 	mov	eax, [esi+12]
   283 0000B0AF 38E9                <1> 	cmp	cl, ch
   284 0000B0B1 0F84FA000000        <1>         je      loc_ccd_load_sub_directory
   285 0000B0B7 A3[50820100]        <1> 	mov	[Current_Dir_FCluster], eax
   286                              <1> 
   287                              <1> loc_ccd_load_child_dir_next:
   288 0000B0BC 83C610              <1> 	add	esi, 16 ; DOS DirEntry Format FileName Address
   289                              <1> 
   290                              <1>  	; Directory attribute : 10h
   291 0000B0BF B010                <1> 	mov	al, 00010000b ; 10h (Attrib AND mask)
   292                              <1> 	;mov	ah, 11001000b ; C8h
   293                              <1> 	; Volume name attribute: 8h
   294 0000B0C1 B408                <1> 	mov	ah, 00001000b ; 08h (Attrib NAND, AND --> zero mask)
   295                              <1> 
   296 0000B0C3 6631C9              <1> 	xor	cx, cx  
   297 0000B0C6 E8B5010000          <1> 	call	locate_current_dir_file
   298 0000B0CB 7353                <1> 	jnc	short loc_ccd_set_dir_cluster_ptr
   299                              <1> 
   300                              <1> 	 ; 19/02/2016
   301                              <1> 	;mov	edi, [CCD_DriveDT]
   302 0000B0CD 8A25[378A0100]      <1> 	mov	ah, [CCD_Level]
   303 0000B0D3 803D[418A0100]CD    <1> 	cmp	byte [CD_COMMAND], 0CDh ;'CD' command or another
   304 0000B0DA 7509                <1> 	jne	short loc_ccd_load_child_dir_err
   305                              <1> 	; It is better to save recent successful part 
   306                              <1> 	; of the (requested) path as current directory.
   307                              <1> 	; (Otherwise the path would be reset to back
   308                              <1> 	; on the next 'CD' command.)
   309 0000B0DC 88E1                <1> 	mov	cl, ah
   310 0000B0DE 50                  <1> 	push	eax
   311 0000B0DF E8E3000000          <1> 	call	loc_ccd_save_current_dir
   312 0000B0E4 58                  <1> 	pop	eax
   313                              <1> loc_ccd_load_child_dir_err:            
   314 0000B0E5 3C03                <1> 	cmp	al, 3	; AL = 2 => File not found error
   315 0000B0E7 7202                <1> 	jb	short loc_ccd_path_not_found_retn
   316 0000B0E9 F9                  <1> 	stc
   317 0000B0EA C3                  <1> 	retn
   318                              <1> 
   319                              <1> loc_ccd_path_not_found_retn:
   320 0000B0EB B003                <1> 	mov	al, 3	; Path not found
   321 0000B0ED C3                  <1> 	retn
   322                              <1> 
   323                              <1> loc_ccd_load_FAT_root_dir:
   324 0000B0EE 803D[55820100]02    <1> 	cmp	byte [Current_FATType], 2
   325 0000B0F5 776B                <1> 	ja	short loc_ccd_load_FAT32_root_dir
   326                              <1> 
   327                              <1> 	;mov	esi, [CCD_DriveDT]
   328                              <1> 	;push	esi
   329 0000B0F7 E8B51D0000          <1> 	call	load_FAT_root_directory
   330                              <1> 	;pop	edi ; Dos Drv Description Table
   331                              <1> 
   332 0000B0FC 89F7                <1> 	mov	edi, esi
   333 0000B0FE BE[B3890100]        <1> 	mov	esi, PATH_Array
   334 0000B103 7297                <1> 	jc	short loc_ccd_retn_p
   335                              <1> 
   336 0000B105 31C0                <1> 	xor	eax, eax
   337 0000B107 EB78                <1>         jmp	short loc_ccd_set_cdfc
   338                              <1> 
   339                              <1> loc_ccd_load_root_dir:
   340 0000B109 803D[55820100]01    <1> 	cmp	byte [Current_FATType], 1
   341 0000B110 73DC                <1> 	jnb	short loc_ccd_load_FAT_root_dir
   342                              <1> 
   343                              <1> loc_ccd_load_FS_root_dir:
   344 0000B112 E8611E0000          <1> 	call	load_FS_root_directory
   345 0000B117 EB5C                <1> 	jmp	short pass_ccd_load_FAT_sub_directory
   346                              <1> 
   347                              <1> loc_ccd_load_FS_sub_directory_next:
   348 0000B119 E85B1E0000          <1> 	call	load_FS_sub_directory
   349 0000B11E EB1F                <1> 	jmp	short pass_ccd_set_dir_cluster_ptr  
   350                              <1> 
   351                              <1> loc_ccd_set_dir_cluster_ptr:
   352                              <1> 	; EDI = Directory Entry
   353 0000B120 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
   354 0000B124 C1E010              <1> 	shl	eax, 16
   355 0000B127 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
   356                              <1> 
   357 0000B12B 8B35[338A0100]      <1> 	mov	esi, [CCD_DriveDT]
   358 0000B131 803D[55820100]01    <1> 	cmp	byte [Current_FATType], 1
   359 0000B138 72DF                <1> 	jb	short loc_ccd_load_FS_sub_directory_next
   360                              <1> 	;push	esi
   361 0000B13A E8FD1D0000          <1> 	call	load_FAT_sub_directory
   362                              <1> 	;pop	edi ; Dos Drv Description Table
   363                              <1> 
   364                              <1> pass_ccd_set_dir_cluster_ptr:
   365                              <1> 	;mov	edi, esi
   366 0000B13F BE[B3890100]        <1> 	mov	esi, PATH_Array
   367 0000B144 7264                <1> 	jc	short loc_ccd_retn_c
   368                              <1> 
   369 0000B146 A1[81890100]        <1> 	mov	eax, [DirBuff_Cluster]
   370                              <1> 
   371 0000B14B FE05[378A0100]      <1> 	inc	byte [CCD_Level]
   372 0000B151 0FB61D[378A0100]    <1> 	movzx	ebx, byte [CCD_Level]
   373 0000B158 C0E304              <1> 	shl	bl, 4 ; * 16 (<= 128)   
   374 0000B15B 01DE                <1> 	add	esi, ebx ; 19/02/2016
   375 0000B15D 89460C              <1> 	mov	[esi+12], eax
   376 0000B160 EB1F                <1> 	jmp	short loc_ccd_set_cdfc
   377                              <1> 
   378                              <1> loc_ccd_load_FAT32_root_dir:
   379 0000B162 BE[B3890100]        <1> 	mov	esi, PATH_Array
   380 0000B167 8B460C              <1> 	mov	eax, [esi+12]
   381 0000B16A 8B35[338A0100]      <1> 	mov	esi, [CCD_DriveDT]
   382                              <1>  
   383                              <1> loc_ccd_load_FAT_sub_directory:
   384                              <1> 	;push	esi
   385 0000B170 E8C71D0000          <1> 	call	load_FAT_sub_directory
   386                              <1> 	;pop	edi ; Dos Drv Description Table
   387                              <1> 
   388                              <1> pass_ccd_load_FAT_sub_directory:
   389                              <1> 	;mov	edi, esi
   390 0000B175 BE[B3890100]        <1> 	mov	esi, PATH_Array
   391 0000B17A 722E                <1> 	jc	short loc_ccd_retn_c
   392                              <1> 
   393 0000B17C A1[81890100]        <1> 	mov	eax, [DirBuff_Cluster]
   394                              <1> 
   395                              <1> loc_ccd_set_cdfc:
   396 0000B181 8A0D[378A0100]      <1> 	mov	cl, [CCD_Level]
   397 0000B187 880D[54820100]      <1> 	mov	[Current_Dir_Level], cl
   398 0000B18D A3[50820100]        <1> 	mov	[Current_Dir_FCluster], eax
   399                              <1> 
   400 0000B192 8A2D[388A0100]      <1> 	mov	ch, [Last_Dir_Level]
   401 0000B198 38E9                <1> 	cmp	cl, ch 
   402 0000B19A 0F821CFFFFFF        <1> 	jb	loc_ccd_load_child_dir_next
   403                              <1> 	
   404 0000B1A0 803D[418A0100]CD    <1> 	cmp	byte [CD_COMMAND], 0CDh ;'CD' command or another
   405 0000B1A7 741E                <1> 	je	short loc_ccd_save_current_dir
   406                              <1> 
   407                              <1>         ; jne -> don't save, restore (the previous cdir) later !
   408                              <1>         ; (saving the cdir would prevent previous cdir restoration!)
   409                              <1> 
   410 0000B1A9 F8                  <1> 	clc
   411                              <1> 
   412                              <1> loc_ccd_retn_c:
   413 0000B1AA 8B3D[338A0100]      <1> 	mov	edi, [CCD_DriveDT]
   414 0000B1B0 C3                  <1> 	retn
   415                              <1> 
   416                              <1> loc_ccd_load_sub_directory:
   417 0000B1B1 8B35[338A0100]      <1> 	mov	esi, [CCD_DriveDT]
   418 0000B1B7 803D[55820100]01    <1> 	cmp	byte [Current_FATType], 1
   419 0000B1BE 73B0                <1> 	jnb	short loc_ccd_load_FAT_sub_directory 
   420 0000B1C0 E8B41D0000          <1> 	call	load_FS_sub_directory
   421 0000B1C5 EBAE                <1> 	jmp	short pass_ccd_load_FAT_sub_directory 
   422                              <1> 
   423                              <1> loc_ccd_save_current_dir:
   424 0000B1C7 BE[B3890100]        <1> 	mov	esi, PATH_Array ; 19/02/2016
   425 0000B1CC 8B3D[338A0100]      <1> 	mov	edi, [CCD_DriveDT]
   426 0000B1D2 57                  <1> 	push	edi
   427 0000B1D3 83C77F              <1>         add     edi, LD_CDirLevel
   428 0000B1D6 880F                <1> 	mov	[edi], cl
   429 0000B1D8 47                  <1> 	inc	edi ; LD_CurrentDirectory 
   430 0000B1D9 56                  <1> 	push	esi
   431                              <1> 	;mov	ecx, 32  ; always < 65536 (in this procedure)
   432 0000B1DA 66B92000            <1> 	mov	cx, 32
   433 0000B1DE F3A5                <1> 	rep	movsd
   434                              <1> 	; Current directory has been saved to 
   435                              <1> 	; the DOS drive description table, cdir area !
   436 0000B1E0 5E                  <1> 	pop	esi  ; PATH_Array
   437 0000B1E1 5F                  <1> 	pop	edi  ; Dos Drv Description Table
   438                              <1> 
   439 0000B1E2 C3                  <1> 	retn
   440                              <1> 
   441                              <1> parse_dir_name:
   442                              <1> 	; 11/02/2016
   443                              <1> 	; 10/02/2016
   444                              <1> 	; 07/02/2016 (TRDOS 386 = TRDOS v2.0)
   445                              <1> 	; 18/09/2011
   446                              <1> 	; 17/10/2009
   447                              <1> 	; INPUT ->
   448                              <1> 	;	ESI = ASCIIZ Directory String Address
   449                              <1> 	;	AL = Current Directory Level
   450                              <1> 	;	EDI = Destination Adress
   451                              <1> 	;	     (8 levels, each one 12+4 byte)
   452                              <1> 	; OUTPUT ->
   453                              <1> 	;	EDI = Dir Entry Formatted Array
   454                              <1> 	;	     with zero cluster pointer at the last level
   455                              <1> 	;	AH = Last Dir Level
   456                              <1> 	;	AL = Current Dir Level
   457                              <1> 	;
   458                              <1> 	; (esi, ebx, ecx will be changed) 
   459                              <1> 
   460                              <1> 	;mov	[PATH_Array_Ptr], edi
   461 0000B1E3 88C4                <1> 	mov	ah, al
   462 0000B1E5 66A3[D88A0100]      <1> 	mov	[PATH_CDLevel], ax
   463                              <1> repeat_ppdn_check_slash:
   464 0000B1EB AC                  <1> 	lodsb
   465 0000B1EC 3C2F                <1> 	cmp	al, '/'
   466 0000B1EE 74FB                <1> 	je	short repeat_ppdn_check_slash
   467 0000B1F0 3C21                <1> 	cmp	al, 21h
   468 0000B1F2 7219                <1> 	jb	short loc_ppdn_retn
   469 0000B1F4 57                  <1> 	push	edi
   470                              <1> loc_ppdn_get_dir_name:
   471 0000B1F5 B90C000000          <1> 	mov	ecx, 12
   472 0000B1FA BF[DA8A0100]        <1> 	mov	edi, Dir_File_Name
   473                              <1> repeat_ppdn_get_dir_name:
   474 0000B1FF AA                  <1> 	stosb
   475 0000B200 AC                  <1> 	lodsb
   476 0000B201 3C2F                <1> 	cmp	al, '/'
   477 0000B203 740A                <1> 	je	short loc_check_level_dot_conv_dir_name
   478 0000B205 3C20                <1> 	cmp	al, 20h
   479 0000B207 7605                <1> 	jna	short loc_ppdn_end_of_path_scan
   480 0000B209 E2F4                <1> 	loop	repeat_ppdn_get_dir_name
   481 0000B20B 5F                  <1> 	pop	edi
   482 0000B20C F9                  <1> 	stc
   483                              <1> loc_ppdn_retn:
   484 0000B20D C3                  <1> 	retn
   485                              <1> 
   486                              <1> loc_ppdn_end_of_path_scan:
   487 0000B20E 4E                  <1> 	dec	esi
   488                              <1> loc_check_level_dot_conv_dir_name:
   489 0000B20F 31C0                <1> 	xor	eax, eax
   490 0000B211 AA                  <1> 	stosb
   491 0000B212 89F3                <1> 	mov	ebx, esi
   492 0000B214 BE[DA8A0100]        <1> 	mov	esi, Dir_File_Name
   493 0000B219 AC                  <1> 	lodsb
   494                              <1> repeat_ppdn_name_check_dot:
   495 0000B21A 3C2E                <1> 	cmp	al, '.'
   496 0000B21C 7509                <1> 	jne	short loc_ppdn_convert_sub_dir_name
   497                              <1> repeat_ppdn_name_dot_dot:
   498 0000B21E AC                  <1> 	lodsb
   499 0000B21F 3C2E                <1> 	cmp	al, '.'
   500 0000B221 743E                <1> 	je	short loc_ppdn_dot_dot
   501 0000B223 3C21                <1> 	cmp	al, 21h
   502 0000B225 7226                <1> 	jb	short pass_ppdn_convert_sub_dir_name
   503                              <1> loc_ppdn_convert_sub_dir_name:
   504 0000B227 8A25[D98A0100]      <1> 	mov	ah, [PATH_Level]
   505 0000B22D 80FC07              <1> 	cmp	ah, 7
   506 0000B230 731B                <1> 	jnb	short pass_ppdn_convert_sub_dir_name
   507 0000B232 FEC4                <1> 	inc	ah  
   508 0000B234 8825[D98A0100]      <1> 	mov	[PATH_Level], ah
   509 0000B23A BE[DA8A0100]        <1> 	mov	esi, Dir_File_Name
   510                              <1> 	;mov	edi, [PATH_Array_Ptr]
   511 0000B23F B010                <1> 	mov	al, 16
   512 0000B241 F6E4                <1> 	mul	ah
   513 0000B243 8B3C24              <1> 	mov	edi, [esp]
   514                              <1> 	;push	edi 
   515 0000B246 01C7                <1> 	add	edi, eax
   516 0000B248 E82A030000          <1> 	call	convert_file_name
   517                              <1> 	;pop	edi
   518                              <1> pass_ppdn_convert_sub_dir_name:
   519 0000B24D 89DE                <1> 	mov	esi, ebx
   520                              <1> repeat_ppdn_check_last_slash:
   521 0000B24F AC                  <1> 	lodsb
   522 0000B250 3C2F                <1> 	cmp	al, '/'
   523 0000B252 74FB                <1> 	je	short repeat_ppdn_check_last_slash
   524 0000B254 3C21                <1> 	cmp	al, 21h
   525 0000B256 739D                <1> 	jnb	short loc_ppdn_get_dir_name
   526                              <1> end_of_parse_dir_name:
   527 0000B258 5F                  <1> 	pop	edi
   528 0000B259 F5                  <1> 	cmc  
   529                              <1> 	;mov	al, [PATH_CDLevel]
   530                              <1> 	;mov	ah, [PATH_Level]
   531 0000B25A 66A1[D88A0100]      <1> 	mov	ax, [PATH_CDLevel]
   532 0000B260 C3                  <1> 	retn
   533                              <1> 
   534                              <1> loc_ppdn_dot_dot:
   535 0000B261 AC                  <1> 	lodsb
   536 0000B262 3C21                <1> 	cmp	al, 21h
   537 0000B264 73F2                <1> 	jnb	short end_of_parse_dir_name 
   538                              <1> loc_ppdn_dot_dot_prev_level:
   539 0000B266 66A1[D88A0100]      <1> 	mov	ax, [PATH_CDLevel]
   540 0000B26C 80EC01              <1> 	sub	ah, 1
   541 0000B26F 80D400              <1> 	adc	ah, 0
   542 0000B272 38E0                <1> 	cmp	al, ah
   543 0000B274 7602                <1> 	jna	short pass_ppdn_set_al_to_ah
   544 0000B276 88E0                <1> 	mov	al, ah
   545                              <1> pass_ppdn_set_al_to_ah:
   546 0000B278 66A3[D88A0100]      <1> 	mov	[PATH_CDLevel], ax
   547 0000B27E EBCD                <1> 	jmp	short pass_ppdn_convert_sub_dir_name
   548                              <1> 
   549                              <1> locate_current_dir_file:
   550                              <1> 	; 20/11/2017
   551                              <1> 	; 14/02/2016
   552                              <1> 	; 13/02/2016
   553                              <1> 	; 10/02/2016
   554                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
   555                              <1> 	; 14/08/2010
   556                              <1> 	; 19/09/2009
   557                              <1>         ; 2005
   558                              <1> 	; INPUT ->
   559                              <1> 	;	ESI = DOS DirEntry Format FileName Address
   560                              <1> 	;	AL = Attributes Mask 
   561                              <1> 	;	(<AL AND EntryAttrib> must be equal to AL)
   562                              <1> 	;	AH = Negative Attributes Mask (If AH>0)
   563                              <1> 	;	(<AH AND EntryAttrib> must be ZERO)
   564                              <1> 	;	CH > 0 Find First Free Dir Entry or Deleted Entry
   565                              <1> 	;	CL = 0 -> Return the First Free Dir Entry
   566                              <1> 	;	CL = E5h -> Return the 1st deleted entry
   567                              <1> 	;	CL = FFh -> Return the 1st deleted or free entry
   568                              <1> 	;	CL > 0 and CL <> E5h and CL <> FFh -> Return the first 
   569                              <1> 	;	     proper entry (which fits with Atributes Masks)
   570                              <1> 	;	CX = 0 Find Valid File/Directory/VolumeName
   571                              <1> 	;	? = Any One Char
   572                              <1> 	;	* = Every Chars
   573                              <1> 	; OUTPUT ->
   574                              <1> 	;	EDI = Directory Entry Address (in Directory Buffer)
   575                              <1> 	;	ESI = DOS DirEntry Format FileName Address
   576                              <1> 	;	CF = 0 -> No Error, Proper Entry,
   577                              <1> 	;	DL = Attributes
   578                              <1> 	;	DH = Previous Entry Attr (LongName Check)
   579                              <1> 	;	AL > 0 -> Ambiguous filename wildcard "?" used
   580                              <1> 	;	AH > 0 -> Ambiguous filename wildcard "*" used
   581                              <1> 	;	AX = 0 -> Filename full fits with directory entry
   582                              <1> 	;	CH = The 1st Name Char of Current Dir Entry
   583                              <1> 	;	CF = 1 -> Proper entry not found, Error Code in EAX/AL
   584                              <1> 	;	CL = 0 and CH = 0 -> Free Entry (End Of Dir)
   585                              <1> 	;	CL = 0 and CH = E5h -> Deleted Entry fits with filters
   586                              <1> 	;	CL > 0 -> Entry not found, CH invalid
   587                              <1> 	;	CF = 0 -> 
   588                              <1> 	;	EBX = Current Directory Entry Index/Number (BX)
   589                              <1> 
   590                              <1> 	;mov	word [DirBuff_EntryCounter], 0 ; Zero Based
   591                              <1> 
   592 0000B280 8935[3B8A0100]      <1> 	mov	[CDLF_FNAddress], esi
   593 0000B286 66A3[398A0100]      <1> 	mov	[CDLF_AttributesMask], ax
   594 0000B28C 66890D[3F8A0100]    <1> 	mov	[CDLF_DEType], cx
   595                              <1> 
   596 0000B293 31DB                <1> 	xor	ebx, ebx
   597 0000B295 881D[508A0100]      <1> 	mov	[PreviousAttr], bl ; 0  ; 13/02/2016
   598                              <1> 
   599 0000B29B 8A3D[56820100]      <1> 	mov	bh, [Current_Drv]
   600 0000B2A1 381D[7C890100]      <1> 	cmp	byte [DirBuff_ValidData], bl ; 0
   601 0000B2A7 761D                <1> 	jna	short loc_lcdf_reload_current_dir2
   602 0000B2A9 8A1D[7A890100]      <1>         mov     bl, [DirBuff_DRV]
   603 0000B2AF 80EB41              <1> 	sub	bl, 'A'
   604 0000B2B2 38DF                <1> 	cmp	bh, bl
   605 0000B2B4 750E                <1> 	jne	short loc_lcdf_reload_current_dir1
   606 0000B2B6 8B15[81890100]      <1> 	mov	edx, [DirBuff_Cluster]
   607 0000B2BC 3B15[50820100]      <1> 	cmp	edx, [Current_Dir_FCluster]
   608 0000B2C2 7412                <1> 	je	short loc_cdir_locatefile_search
   609                              <1> 
   610                              <1> loc_lcdf_reload_current_dir1:
   611 0000B2C4 30DB                <1> 	xor	bl, bl
   612                              <1> loc_lcdf_reload_current_dir2:
   613 0000B2C6 89DE                <1> 	mov	esi, ebx
   614 0000B2C8 81C600010900        <1>         add     esi, Logical_DOSDisks
   615 0000B2CE E874000000          <1> 	call	reload_current_directory 
   616 0000B2D3 735D                <1> 	jnc	short loc_locatefile_search_again 
   617 0000B2D5 C3                  <1> 	retn  
   618                              <1> 
   619                              <1> loc_cdir_locatefile_search:
   620 0000B2D6 31DB                <1> 	xor	ebx, ebx
   621 0000B2D8 55                  <1> 	push	ebp ; 20/11/2017
   622 0000B2D9 E8A6000000          <1> 	call	find_directory_entry
   623 0000B2DE 5D                  <1> 	pop	ebp ; 20/11/2017
   624 0000B2DF 7349                <1> 	jnc	short loc_cdir_locate_file_retn
   625                              <1> 
   626                              <1> loc_locatefile_check_stc_reason:
   627 0000B2E1 08ED                <1> 	or	ch, ch
   628 0000B2E3 7444                <1> 	jz	short loc_cdir_locate_file_stc_retn
   629                              <1> 
   630                              <1> loc_locatefile_check_next_entryblock:
   631 0000B2E5 8A3D[56820100]      <1> 	mov	bh, [Current_Drv]
   632 0000B2EB 28DB                <1> 	sub	bl, bl
   633 0000B2ED 0FB7F3              <1> 	movzx	esi, bx
   634 0000B2F0 81C600010900        <1>         add     esi, Logical_DOSDisks
   635                              <1> 
   636 0000B2F6 803D[54820100]00    <1> 	cmp	byte [Current_Dir_Level], 0
   637 0000B2FD 760A                <1> 	jna	short loc_locatefile_check_FAT_type
   638                              <1>             
   639 0000B2FF 803D[55820100]01    <1> 	cmp	byte [Current_FATType], 1
   640 0000B306 730A                <1> 	jnb	short loc_locatefile_load_subdir_cluster
   641 0000B308 C3                  <1> 	retn  
   642                              <1> 
   643                              <1> loc_locatefile_check_FAT_type:
   644 0000B309 803D[55820100]03    <1> 	cmp	byte [Current_FATType], 3
   645 0000B310 7218                <1> 	jb	short loc_cdir_locate_file_retn
   646                              <1> 
   647                              <1> loc_locatefile_load_subdir_cluster:
   648 0000B312 A1[81890100]        <1> 	mov	eax, [DirBuff_Cluster]
   649 0000B317 E83A1A0000          <1> 	call	get_next_cluster
   650 0000B31C 730D                <1> 	jnc	short loc_locatefile_next_cluster
   651 0000B31E 09C0                <1> 	or	eax, eax
   652 0000B320 7507                <1> 	jnz	short loc_locatefile_drive_not_ready_read_err
   653 0000B322 F9                  <1> 	stc
   654                              <1> loc_locatefile_file_notfound:
   655 0000B323 B802000000          <1> 	mov	eax, 2 ; File/Directory/VolName not found
   656 0000B328 C3                  <1> 	retn
   657                              <1> 
   658                              <1> loc_locatefile_drive_not_ready_read_err:
   659                              <1> 	;mov	eax, 17 ;Drive not ready or read error
   660                              <1> loc_cdir_locate_file_stc_retn:
   661 0000B329 F5                  <1> 	cmc ;stc
   662                              <1> loc_cdir_locate_file_retn:
   663 0000B32A C3                  <1> 	retn
   664                              <1> 
   665                              <1> loc_locatefile_next_cluster:
   666 0000B32B E80C1C0000          <1> 	call	load_FAT_sub_directory
   667                              <1> 	;jc	short loc_locatefile_drive_not_ready_read_err
   668 0000B330 72F8                <1> 	jc	short loc_cdir_locate_file_retn 
   669                              <1> 
   670                              <1> loc_locatefile_search_again:
   671 0000B332 8B35[3B8A0100]      <1> 	mov	esi, [CDLF_FNAddress] 
   672 0000B338 66A1[398A0100]      <1> 	mov	ax, [CDLF_AttributesMask]
   673 0000B33E 668B0D[3F8A0100]    <1> 	mov	cx, [CDLF_DEType] 
   674 0000B345 EB8F                <1> 	jmp	short loc_cdir_locatefile_search
   675                              <1> 
   676                              <1> reload_current_directory:
   677                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
   678                              <1> 	; 13/06/2010
   679                              <1> 	; 22/09/2009
   680                              <1>         ;
   681                              <1> 	; INPUT ->
   682                              <1> 	;	ESI = Dos drive description table address
   683                              <1> 	
   684                              <1> 	;mov	al, [esi+LD_FATType]
   685 0000B347 A0[55820100]        <1> 	mov	al, [Current_FATType]
   686 0000B34C 3C02                <1> 	cmp	al, 2
   687 0000B34E 7729                <1> 	ja	short loc_reload_FAT_sub_directory
   688 0000B350 8A25[54820100]      <1> 	mov	ah, [Current_Dir_Level]
   689 0000B356 08C0                <1> 	or	al, al
   690 0000B358 740A                <1> 	jz	short loc_reload_FS_directory
   691 0000B35A 08E4                <1> 	or	ah, ah
   692 0000B35C 751B                <1> 	jnz	short loc_reload_FAT_sub_directory
   693                              <1> loc_reload_FAT_12_16_root_directory:
   694 0000B35E E84E1B0000          <1> 	call	load_FAT_root_directory
   695 0000B363 C3                  <1> 	retn
   696                              <1> loc_reload_FS_directory:
   697 0000B364 20E4                <1> 	and	ah, ah
   698 0000B366 7506                <1> 	jnz	short loc_reload_FS_sub_directory 
   699                              <1> loc_reload_FS_root_directory: 
   700 0000B368 E80B1C0000          <1> 	call	load_FS_root_directory
   701 0000B36D C3                  <1> 	retn
   702                              <1> loc_reload_FS_sub_directory:
   703 0000B36E A1[50820100]        <1> 	mov	eax, [Current_Dir_FCluster]
   704 0000B373 E8011C0000          <1> 	call	load_FS_sub_directory
   705 0000B378 C3                  <1> 	retn 
   706                              <1> loc_reload_FAT_sub_directory:
   707 0000B379 A1[50820100]        <1> 	mov	eax, [Current_Dir_FCluster]
   708 0000B37E E8B91B0000          <1> 	call	load_FAT_sub_directory
   709 0000B383 C3                  <1> 	retn
   710                              <1> 
   711                              <1> find_directory_entry:
   712                              <1> 	; 14/02/2016
   713                              <1> 	; 13/02/2016
   714                              <1> 	; 10/02/2016
   715                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
   716                              <1> 	; 14/08/2010 (DIR.ASM, "proc_find_direntry")
   717                              <1> 	; 19/09/2009
   718                              <1> 	; 2005
   719                              <1> 	; INPUT ->
   720                              <1> 	;	ESI = Sub Dir or File Name Address
   721                              <1> 	;	AL = Attributes Mask 
   722                              <1> 	;	(<AL AND EntryAttrib> must be equal to AL)
   723                              <1> 	;	AH = Negative Attributes Mask (If AH>0)
   724                              <1> 	;	(<AH AND EntryAttrib> must be ZERO)
   725                              <1> 	;	CH > 0 Find First Free Dir Entry or Deleted Entry
   726                              <1> 	;	CL = 0 -> Return the First Free Dir Entry
   727                              <1> 	;	CL = E5h -> Return the 1st deleted entry
   728                              <1> 	;	CL = FFh -> Return the 1st deleted or free entry
   729                              <1> 	;	CL > 0 and CL <> E5h and CL <> FFh -> Return the first 
   730                              <1> 	;            proper entry (which fits with Atributes Masks)
   731                              <1> 	;	CX = 0 -> Find Valid File/Directory/VolumeName
   732                              <1> 	;	? = Any One Char
   733                              <1> 	;	* = Every Chars
   734                              <1> 	;	EBX = Current Dir Entry (BX)
   735                              <1> 	;
   736                              <1> 	; OUTPUT -> 
   737                              <1> 	;	EDI = Directory Entry Address (in DirectoryBuffer)
   738                              <1> 	;	ESI = Sub Dir or File Name Address
   739                              <1> 	;	CF = 0 -> No Error, Proper Entry,
   740                              <1> 	;	DL = Attributes
   741                              <1> 	;	DH = Previous Entry Attr (LongName Check)
   742                              <1> 	;	AL > 0 -> Ambiguous filename wildcard "?" used
   743                              <1> 	;	AH > 0 -> Ambiguous filename wildcard "*" used
   744                              <1> 	;	AX = 0 -> Filename full fits with directory entry
   745                              <1> 	;	EBX = CurrentDirEntry (BX)
   746                              <1> 	;	CH = The 1st Name Char of Current Dir Entry
   747                              <1> 	;	CF = 1 -> Proper entry not found, Error Code in AX/AL
   748                              <1> 	;	CL = 0 and CH = 0 -> Free Entry (End Of Dir)
   749                              <1> 	;	CL = 0 and CH = E5h -> Deleted Entry fits with filters
   750                              <1> 	;	CL > 0 -> Entry not found, CH invalid
   751                              <1> 	;
   752                              <1> 	; (EAX, EBX, ECX, EDX, EDI, EBP will be changed)	 
   753                              <1> 
   754 0000B384 663B1D[7F890100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   755 0000B38B 0F8739010000        <1>         ja      loc_ffde_stc_retn_255
   756                              <1> 
   757                              <1> 	;mov    [DirBuff_CurrentEntry], bx  
   758                              <1> 
   759 0000B391 BF00000800          <1>   	mov	edi, Directory_Buffer
   760 0000B396 66A3[4C8A0100]      <1> 	mov	[FDE_AttrMask], ax
   761                              <1> 
   762 0000B39C 29C0                <1> 	sub	eax, eax
   763                              <1>             
   764                              <1> 	;;mov	[PreviousAttr], al ; 0 ;; 13/02/2016
   765 0000B39E 66A3[4E8A0100]      <1> 	mov	[AmbiguousFileName], ax ; 0
   766                              <1> 
   767 0000B3A4 6689D8              <1> 	mov	ax, bx
   768 0000B3A7 66C1E005            <1> 	shl	ax, 5 ; ; * 32 ; Directory entry size
   769 0000B3AB 01C7                <1> 	add     edi, eax
   770                              <1> 
   771 0000B3AD 08ED                <1> 	or	ch, ch
   772 0000B3AF 0F852C010000        <1>         jnz     loc_find_free_deleted_entry_0
   773                              <1> 
   774 0000B3B5 08C9                <1> 	or      cl, cl
   775 0000B3B7 0F850D010000        <1>         jnz     loc_ffde_stc_retn_255
   776                              <1>  
   777                              <1> check_find_dir_entry:
   778 0000B3BD 66A1[4C8A0100]      <1> 	mov	ax, [FDE_AttrMask]
   779 0000B3C3 8A2F                <1> 	mov	ch, [edi]
   780 0000B3C5 80FD00              <1> 	cmp     ch, 0 ; Is it never used entry?
   781 0000B3C8 0F86FF000000        <1> 	jna	loc_find_direntry_stc_retn 
   782 0000B3CE 56                  <1> 	push	esi
   783 0000B3CF 8A570B              <1> 	mov	dl, [edi+0Bh] ; File attributes
   784 0000B3D2 80FDE5              <1> 	cmp	ch, 0E5h ; Is it a deleted file?
   785 0000B3D5 746D                <1> 	je	short loc_find_dir_next_entry_prevdeleted
   786                              <1> 
   787 0000B3D7 80FA0F              <1> 	cmp     dl, 0Fh ; longname sub component check
   788 0000B3DA 7505                <1> 	jne     short loc_check_attributes_mask
   789 0000B3DC E8ED010000          <1> 	call	save_longname_sub_component
   790                              <1> 
   791                              <1> loc_check_attributes_mask:
   792 0000B3E1 88C6                <1> 	mov	dh, al
   793 0000B3E3 20D6                <1> 	and	dh, dl    
   794 0000B3E5 38F0                <1> 	cmp	al, dh
   795 0000B3E7 0F85BA000000        <1>         jne     loc_find_dir_next_entry
   796 0000B3ED 20D4                <1> 	and	ah, dl
   797 0000B3EF 0F85B2000000        <1>         jnz     loc_find_dir_next_entry
   798 0000B3F5 80FA0F              <1> 	cmp	dl, 0Fh
   799 0000B3F8 751A                <1> 	jne	short pass_direntry_attr_check
   800                              <1> 
   801 0000B3FA 3C0F                <1> 	cmp	al, 0Fh ; AL = 0Fh -> find long name
   802 0000B3FC 0F85A5000000        <1>         jne     loc_find_dir_next_entry
   803                              <1> 
   804 0000B402 5E                  <1> 	pop	esi
   805 0000B403 6631C0              <1> 	xor	ax, ax
   806 0000B406 8A35[508A0100]      <1> 	mov	dh, [PreviousAttr]
   807 0000B40C 66891D[7D890100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   808 0000B413 C3                  <1> 	retn
   809                              <1> 
   810                              <1> pass_direntry_attr_check:
   811 0000B414 89FD                <1> 	mov	ebp, edi ; 14/02/2016
   812 0000B416 B908000000          <1> 	mov	ecx, 8
   813                              <1> loc_lodsb_find_dir:
   814 0000B41B AC                  <1> 	lodsb
   815 0000B41C 3C2A                <1> 	cmp	al, '*'
   816 0000B41E 7508                <1> 	jne	short pass_fde_ambiguous1_check
   817 0000B420 FE05[4F8A0100]      <1>         inc     byte [AmbiguousFileName+1]
   818 0000B426 EB28                <1> 	jmp	short loc_check_direntry_extension
   819                              <1> 
   820                              <1> pass_fde_ambiguous1_check:
   821 0000B428 3C3F                <1> 	cmp	al, '?'
   822 0000B42A 750D                <1> 	jne	short pass_fde_ambiguous2_check
   823 0000B42C FE05[4E8A0100]      <1> 	inc	byte [AmbiguousFileName]
   824 0000B432 803F20              <1> 	cmp	byte [edi], 20h
   825 0000B435 764E                <1> 	jna	short loc_find_dir_next_entry_ebp
   826 0000B437 EB14                <1> 	jmp	short loc_scasb_find_dir_inc_di
   827                              <1> 
   828                              <1> pass_fde_ambiguous2_check:
   829 0000B439 3C20                <1> 	cmp	al, 20h
   830 0000B43B 750C                <1> 	jne	short loc_scasb_find_dir
   831 0000B43D 803F20              <1> 	cmp	byte [edi], 20h
   832 0000B440 7543                <1> 	jne	short loc_find_dir_next_entry_ebp
   833 0000B442 EB0C                <1> 	jmp	short loc_check_direntry_extension
   834                              <1> 
   835                              <1> loc_find_dir_next_entry_prevdeleted:
   836 0000B444 80CA80              <1> 	or	dl, 80h  ; Bit 7 -> deleted entry sign
   837 0000B447 EB5E                <1> 	jmp	short loc_find_dir_next_entry
   838                              <1> 
   839                              <1> loc_scasb_find_dir:
   840 0000B449 3A07                <1> 	cmp	al, [edi]
   841 0000B44B 7538                <1> 	jne	short loc_find_dir_next_entry_ebp
   842                              <1> loc_scasb_find_dir_inc_di:
   843 0000B44D 47                  <1> 	inc	edi
   844 0000B44E E2CB                <1> 	loop	loc_lodsb_find_dir
   845                              <1> 
   846                              <1> loc_check_direntry_extension:
   847 0000B450 BE08000000          <1> 	mov	esi, 8
   848 0000B455 89F7                <1> 	mov	edi, esi ; 8
   849 0000B457 033424              <1> 	add	esi, [esp] ; Sub Dir or File Name Address
   850 0000B45A 01EF                <1> 	add	edi, ebp
   851 0000B45C B103                <1> 	mov	cl, 3
   852                              <1> loc_lodsb_find_dir_ext:
   853 0000B45E AC                  <1> 	lodsb
   854 0000B45F 3C2A                <1> 	cmp	al, '*'
   855 0000B461 7508                <1> 	jne	short pass_fde_ambiguous3_check
   856 0000B463 FE05[4F8A0100]      <1> 	inc	byte [AmbiguousFileName+1]
   857 0000B469 EB1E                <1> 	jmp	short loc_find_dir_proper_direntry
   858                              <1> 
   859                              <1> pass_fde_ambiguous3_check:
   860 0000B46B 3C3F                <1> 	cmp	al, '?'
   861 0000B46D 750D                <1> 	jne	short pass_fde_ambiguous4_check
   862 0000B46F FE05[4E8A0100]      <1> 	inc	byte [AmbiguousFileName]
   863 0000B475 803F20              <1> 	cmp	byte [edi], 20h
   864 0000B478 760B                <1> 	jna	short loc_find_dir_next_entry_ebp
   865 0000B47A EB49                <1> 	jmp	short loc_scasb_find_dir_ext_inc_di
   866                              <1> 
   867                              <1> pass_fde_ambiguous4_check:
   868 0000B47C 3C20                <1> 	cmp	al, 20h
   869 0000B47E 7541                <1> 	jne	short loc_scasb_find_dir_ext
   870 0000B480 803F20              <1> 	cmp	byte [edi], 20h
   871 0000B483 7404                <1> 	je	short loc_find_dir_proper_direntry
   872                              <1> 
   873                              <1> loc_find_dir_next_entry_ebp:
   874 0000B485 89EF                <1> 	mov	edi, ebp ; 14/02/2016
   875 0000B487 EB1E                <1> 	jmp	short loc_find_dir_next_entry
   876                              <1> 
   877                              <1> loc_find_dir_proper_direntry:
   878 0000B489 30C9                <1> 	xor	cl, cl
   879                              <1> loc_find_dir_proper_direntry_1:
   880 0000B48B 5E                  <1> 	pop	esi
   881 0000B48C 89EF                <1>         mov     edi, ebp
   882 0000B48E 8A2F                <1> 	mov	ch, [edi]
   883 0000B490 8A570B              <1> 	mov     dl, [edi+0Bh] ; Dir entry attributes
   884 0000B493 66A1[4E8A0100]      <1> 	mov	ax, [AmbiguousFileName]
   885                              <1> loc_find_dir_proper_direntry_2:
   886 0000B499 8A35[508A0100]      <1> 	mov     dh, [PreviousAttr]
   887 0000B49F 66891D[7D890100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   888 0000B4A6 C3                  <1> 	retn
   889                              <1> 
   890                              <1> loc_find_dir_next_entry:
   891 0000B4A7 8815[508A0100]      <1> 	mov	byte [PreviousAttr], dl ; LongName check
   892                              <1> loc_find_dir_next_entry_1:
   893 0000B4AD 5E                  <1> 	pop	esi
   894 0000B4AE 83C720              <1> 	add	edi, 32
   895                              <1> 	;inc	word [DirBuff_EntryCounter]
   896 0000B4B1 6643                <1> 	inc	bx
   897 0000B4B3 663B1D[7F890100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   898 0000B4BA 770E                <1> 	ja	short loc_ffde_stc_retn_255
   899 0000B4BC E9FCFEFFFF          <1>         jmp     check_find_dir_entry 
   900                              <1> 
   901                              <1> loc_scasb_find_dir_ext:
   902 0000B4C1 3A07                <1> 	cmp	al, [edi]
   903 0000B4C3 75C0                <1> 	jne	short loc_find_dir_next_entry_ebp
   904                              <1> loc_scasb_find_dir_ext_inc_di:
   905 0000B4C5 47                  <1> 	inc	edi
   906 0000B4C6 E296                <1> 	loop    loc_lodsb_find_dir_ext
   907 0000B4C8 EBC1                <1> 	jmp	short loc_find_dir_proper_direntry_1
   908                              <1> 
   909                              <1> loc_ffde_stc_retn_255:
   910                              <1> 	;mov	cx, 0FFFFh
   911 0000B4CA 31C9                <1> 	xor	ecx, ecx
   912 0000B4CC 49                  <1> 	dec	ecx ; 0FFFFFFFFh
   913                              <1> 	;xor	eax, eax
   914                              <1> loc_find_direntry_stc_retn:
   915                              <1> loc_check_ffde_retn_1:
   916                              <1> 	;mov	ax, 2
   917 0000B4CD B802000000          <1> 	mov	eax, 2 ; File Not Found
   918 0000B4D2 8A35[508A0100]      <1> 	mov	dh, [PreviousAttr]
   919 0000B4D8 66891D[7D890100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   920 0000B4DF F9                  <1> 	stc
   921 0000B4E0 C3                  <1> 	retn
   922                              <1> 
   923                              <1> loc_find_free_deleted_entry_0:
   924 0000B4E1 66A1[4C8A0100]      <1> 	mov	ax, [FDE_AttrMask]
   925 0000B4E7 8A2F                <1> 	mov	ch, [edi]
   926 0000B4E9 8A570B              <1> 	mov	dl, [edi+0Bh] ; File attributes
   927 0000B4EC 08C9                <1> 	or	cl, cl 
   928 0000B4EE 7407                <1> 	jz	short loc_check_ffde_0_repeat
   929                              <1> 	;cmp	cl, 0E5h
   930                              <1> 	;je	short pass_loc_check_ffde_0_err
   931 0000B4F0 80F9FF              <1> 	cmp	cl, 0FFh
   932 0000B4F3 7432                <1> 	je	short loc_find_free_deleted_entry_1
   933 0000B4F5 EB4D                <1> 	jmp	short pass_loc_check_ffde_0_err
   934                              <1> 
   935                              <1> loc_check_ffde_0_repeat:
   936 0000B4F7 08ED                <1> 	or	ch, ch
   937 0000B4F9 7511                <1> 	jnz	short loc_check_ffde_0_next
   938                              <1> 
   939                              <1> loc_check_ffde_retn_2:
   940 0000B4FB 6629C0              <1> 	sub	ax, ax
   941 0000B4FE 8A35[508A0100]      <1> 	mov	dh, [PreviousAttr]
   942 0000B504 66891D[7D890100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   943 0000B50B C3                  <1> 	retn
   944                              <1>  
   945                              <1> loc_check_ffde_0_next:
   946 0000B50C 6643                <1> 	inc	bx
   947 0000B50E 83C720              <1> 	add	edi, 32
   948                              <1> 	;inc	word [DirBuff_EntryCounter]
   949                              <1> 	 
   950 0000B511 663B1D[7F890100]    <1>         cmp	bx, [DirBuff_LastEntry]
   951 0000B518 77B0                <1> 	ja	short loc_ffde_stc_retn_255
   952 0000B51A 8815[508A0100]      <1> 	mov	[PreviousAttr], dl
   953 0000B520 8A2F                <1> 	mov	ch, [edi]
   954 0000B522 8A570B              <1> 	mov	dl, [edi+0Bh] ; file attributes
   955 0000B525 EBD0                <1> 	jmp	short loc_check_ffde_0_repeat
   956                              <1> 
   957                              <1> loc_find_free_deleted_entry_1:
   958 0000B527 28D2                <1> 	sub	dl, dl      
   959                              <1> loc_find_free_deleted_entry_2:
   960 0000B529 20ED                <1> 	and	ch, ch  
   961 0000B52B 74CE                <1> 	jz	short loc_check_ffde_retn_2
   962 0000B52D 80FDE5              <1> 	cmp	ch, 0E5h
   963 0000B530 74C9                <1> 	je	short loc_check_ffde_retn_2
   964 0000B532 6643                <1> 	inc	bx
   965 0000B534 83C720              <1> 	add	edi, 32
   966 0000B537 663B1D[7F890100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   967 0000B53E 778A                <1> 	ja	short loc_ffde_stc_retn_255
   968 0000B540 8A2F                <1> 	mov	ch, [edi]
   969 0000B542 EBE5                <1> 	jmp	short loc_find_free_deleted_entry_2
   970                              <1> 
   971                              <1> pass_loc_check_ffde_0_err:
   972 0000B544 38CD                <1> 	cmp	ch, cl
   973 0000B546 741F                <1> 	je	short loc_check_ffde_attrib 
   974                              <1> 
   975 0000B548 6643                <1> 	inc	bx
   976 0000B54A 83C720              <1> 	add	edi, 32
   977 0000B54D 663B1D[7F890100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   978 0000B554 0F8770FFFFFF        <1>         ja      loc_ffde_stc_retn_255
   979 0000B55A 8815[508A0100]      <1> 	mov	[PreviousAttr], dl
   980 0000B560 8A2F                <1> 	mov	ch, [edi]
   981 0000B562 8A570B              <1> 	mov	dl, [edi+0Bh]
   982 0000B565 EBDD                <1> 	jmp	short pass_loc_check_ffde_0_err
   983                              <1> 
   984                              <1> loc_check_ffde_attrib:
   985 0000B567 88C6                <1> 	mov	dh, al
   986 0000B569 20D6                <1> 	and	dh, dl    
   987 0000B56B 38F0                <1> 	cmp	al, dh
   988 0000B56D 759D                <1> 	jne	short loc_check_ffde_0_next
   989 0000B56F 20D4                <1> 	and	ah, dl
   990 0000B571 7599                <1> 	jnz	short loc_check_ffde_0_next
   991 0000B573 30C9                <1> 	xor	cl, cl 
   992 0000B575 EB84                <1>         jmp     loc_check_ffde_retn_2
   993                              <1> 
   994                              <1> convert_file_name:
   995                              <1> 	; 06/03/2016
   996                              <1> 	; 11/02/2016
   997                              <1> 	; 07/02/2016 (TRDOS 386 = TRDOS v2.0)
   998                              <1> 	; 06/10/2009
   999                              <1> 	; 2005
  1000                              <1> 	;
  1001                              <1> 	; INPUT  ->
  1002                              <1> 	;	ESI = Dot File Name Location
  1003                              <1> 	;	EDI = Dir Entry Format File Name Location
  1004                              <1> 	; OUTPUT ->
  1005                              <1> 	;	EDI = Dir Entry Format File Name Location
  1006                              <1> 	;	ESI = Dot File Name Location (capitalized)
  1007                              <1> 	;
  1008                              <1> 	; (ECX, AL will be changed) 
  1009                              <1>      
  1010 0000B577 56                  <1> 	push	esi  
  1011 0000B578 57                  <1> 	push	edi
  1012                              <1> 
  1013 0000B579 B90B000000          <1> 	mov	ecx, 11
  1014 0000B57E B020                <1> 	mov	al, 20h
  1015 0000B580 F3AA                <1> 	rep	stosb
  1016                              <1> 
  1017 0000B582 8B3C24              <1> 	mov	edi, [esp]
  1018                              <1> 
  1019 0000B585 B10C                <1> 	mov	cl, 12 ; file name length (max.)
  1020                              <1> 	; 06/03/2016
  1021                              <1> 	; Directory entry name limit (11 bytes) check for
  1022                              <1> 	; 'rename_directory_entry' procedure.
  1023                              <1> 	; (EDI points to Directory Entry)
  1024                              <1> 	; (If the file name would not contain a dot
  1025                              <1> 	; and file name length would be 12, this would cause to
  1026                              <1> 	; overwrite the attributes byte of the directory entry.)
  1027                              <1> 	;
  1028 0000B587 B50B                <1> 	mov	ch, 11 ; directory entry's name length
  1029                              <1> loc_check_first_dot:
  1030 0000B589 8A06                <1> 	mov	al, [esi]
  1031 0000B58B 3C2E                <1> 	cmp	al, 2Eh
  1032 0000B58D 750C                <1> 	jne	short pass_check_first_dot
  1033 0000B58F 8807                <1> 	mov	[edi], al
  1034 0000B591 47                  <1> 	inc	edi
  1035 0000B592 46                  <1> 	inc	esi
  1036 0000B593 FEC9                <1> 	dec	cl
  1037 0000B595 75F2                <1> 	jnz	short loc_check_first_dot
  1038                              <1> 	;;(ecx <= 12)
  1039                              <1> 	;;loop	loc_check_first_dot 
  1040 0000B597 EB30                <1> 	jmp	short stop_convert_file
  1041                              <1> 
  1042                              <1> loc_get_fchar:
  1043 0000B599 8A06                <1> 	mov	al, [esi]
  1044                              <1> pass_check_first_dot:
  1045 0000B59B 3C61                <1> 	cmp	al, 61h ; 'a'
  1046 0000B59D 7208                <1> 	jb	short pass_name_capitalize
  1047 0000B59F 3C7A                <1> 	cmp	al, 7Ah ; 'z'
  1048 0000B5A1 7704                <1> 	ja	short pass_name_capitalize
  1049 0000B5A3 24DF                <1> 	and	al, 0DFh
  1050 0000B5A5 8806                <1> 	mov	[esi], al
  1051                              <1> pass_name_capitalize:
  1052 0000B5A7 3C21                <1> 	cmp	al, 21h
  1053 0000B5A9 721E                <1> 	jb	short stop_convert_file
  1054 0000B5AB 3C2E                <1> 	cmp	al, 2Eh ; '.'
  1055 0000B5AD 750C                <1> 	jne	short pass_dot_space
  1056                              <1> add_dot_space: 
  1057 0000B5AF 80F904              <1> 	cmp	cl, 4
  1058 0000B5B2 760E                <1> 	jna	short inc_and_loop
  1059 0000B5B4 47                  <1> 	inc	edi
  1060 0000B5B5 FECD                <1> 	dec	ch ; 06/03/2016
  1061 0000B5B7 FEC9                <1> 	dec	cl
  1062 0000B5B9 EBF4                <1> 	jmp	short add_dot_space
  1063                              <1> 	
  1064                              <1> 	;mov	al, 4
  1065                              <1> 	;cmp	cl, al
  1066                              <1> 	;jna	short inc_and_loop
  1067                              <1> 	;sub	cl, al
  1068                              <1> 	;add	edi, ecx
  1069                              <1> 	;mov	cl, al
  1070                              <1> 	;jmp	short inc_and_loop	
  1071                              <1> 
  1072                              <1> pass_dot_space:
  1073 0000B5BB 8807                <1> 	mov	[edi], al
  1074                              <1> loc_after_double_dot:
  1075                              <1> 	; 06/03/2016
  1076 0000B5BD FECD                <1> 	dec	ch ; count down for 11 bytes dir entry limit
  1077 0000B5BF 740A                <1> 	jz	short stop_convert_file_x
  1078 0000B5C1 47                  <1> 	inc	edi
  1079                              <1> inc_and_loop:
  1080 0000B5C2 FEC9                <1> 	dec	cl ; count down for 12 bytes filename limit 
  1081 0000B5C4 7403                <1> 	jz	short stop_convert_file	
  1082 0000B5C6 46                  <1> 	inc	esi
  1083                              <1> 	;;(ecx <= 12)
  1084                              <1> 	;;loop	loc_get_fchar
  1085 0000B5C7 EBD0                <1> 	jmp	short loc_get_fchar
  1086                              <1> 
  1087                              <1> stop_convert_file:
  1088                              <1> 	; 06/03/2016
  1089 0000B5C9 30ED                <1> 	xor	ch, ch
  1090                              <1> 	; ECX < 256 ; 'find_first_file' -> xor cl, cl
  1091                              <1> stop_convert_file_x:
  1092 0000B5CB 5F                  <1> 	pop	edi
  1093 0000B5CC 5E                  <1> 	pop	esi
  1094 0000B5CD C3                  <1> 	retn
  1095                              <1>  
  1096                              <1> save_longname_sub_component:
  1097                              <1> 	; 13/02/2016
  1098                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
  1099                              <1> 	; 28/02/2010
  1100                              <1> 	; 17/10/2009
  1101                              <1> 	; INPUT ->
  1102                              <1> 	;	EDI = Directory Entry    
  1103                              <1> 	;     	// This procedure is called
  1104                              <1> 	;	// from 'find_directory_entry' procedure.
  1105                              <1> 	;	// If the last entry returns with
  1106                              <1> 	;	// a non-zero LongnameFound value and
  1107                              <1> 	;	// if LFN_CheckSum value is equal to
  1108                              <1> 	;	// the next shortname checksum,
  1109                              <1> 	;	// long name is valid.
  1110                              <1> 	;	// If a longname is longer than 65 bytes,
  1111                              <1> 	;	// it is invalid for trdos. (>45h)
  1112                              <1>  
  1113 0000B5CE 57                  <1> 	push	edi
  1114 0000B5CF 56                  <1> 	push	esi
  1115                              <1> 	;push	ebx
  1116                              <1> 	;push	ecx
  1117                              <1> 	;push	edx
  1118 0000B5D0 50                  <1> 	push	eax
  1119                              <1>            
  1120 0000B5D1 29C9                <1> 	sub	ecx, ecx
  1121                              <1> 	;sub	eax, eax
  1122 0000B5D3 B11A                <1> 	mov	cl, 26
  1123                              <1> 
  1124 0000B5D5 0FB607              <1> 	movzx	eax, byte [edi] ; LDIR_Order
  1125 0000B5D8 3C41                <1> 	cmp	al, 41h  ; 40h (last long entry sign) + 1
  1126 0000B5DA 722B                <1> 	jb	short pass_pslnsc_last_long_entry
  1127                              <1> 
  1128 0000B5DC 88C4                <1> 	mov	ah, al
  1129 0000B5DE 80EC40              <1> 	sub	ah, 40h
  1130 0000B5E1 8825[528A0100]      <1> 	mov	[LFN_EntryLength], ah
  1131                              <1> 	
  1132 0000B5E7 3C45                <1> 	cmp	al, 45h  ; 40h (last long entry sign) + 5
  1133                              <1>  		; Max 130 byte length is usable in TRDOS
  1134                              <1> ; 26*5 = 130
  1135 0000B5E9 7753                <1> 	ja	short loc_pslnsc_retn
  1136                              <1> 
  1137 0000B5EB 2407                <1> 	and	al, 07h ; 0Fh
  1138 0000B5ED A2[518A0100]        <1> 	mov	[LongNameFound], al
  1139                              <1> 
  1140 0000B5F2 FEC8                <1> 	dec	al
  1141                              <1> 	;mov	cl, 26
  1142 0000B5F4 F6E1                <1> 	mul	cl
  1143                              <1> 
  1144 0000B5F6 89C6                <1> 	mov	esi, eax
  1145 0000B5F8 01CE                <1> 	add	esi, ecx
  1146                              <1> 		; to make is an ASCIIZ string
  1147                              <1> 		; with ax+26 bytes length
  1148 0000B5FA 81C6[548A0100]      <1> 	add	esi, LongFileName
  1149 0000B600 66C7060000          <1> 	mov	word [esi], 0   
  1150 0000B605 EB16                <1> 	jmp	short loc_pslsc_move_ldir_name2 
  1151                              <1> 
  1152                              <1> pass_pslnsc_last_long_entry:
  1153 0000B607 3C04                <1> 	cmp	al, 04h
  1154 0000B609 7733                <1> 	ja	short loc_pslnsc_retn
  1155 0000B60B FE0D[518A0100]      <1> 	dec	byte [LongNameFound]
  1156 0000B611 3A05[518A0100]      <1> 	cmp	al, [LongNameFound]
  1157 0000B617 7525                <1> 	jne	short loc_pslnsc_retn
  1158                              <1> 
  1159                              <1> loc_pslsc_move_ldir_name1:
  1160 0000B619 FEC8                <1> 	dec	al
  1161                              <1> 	;mov	cl, 26
  1162 0000B61B F6E1                <1> 	mul	cl
  1163                              <1> 
  1164                              <1> loc_pslsc_move_ldir_name2:
  1165 0000B61D 8A4F0D              <1> 	mov	cl, [edi+0Dh] ; long name checksum
  1166 0000B620 880D[538A0100]      <1> 	mov	[LFN_CheckSum], cl 
  1167 0000B626 89FE                <1> 	mov	esi, edi ; LDIR_Order
  1168 0000B628 BF[548A0100]        <1> 	mov	edi, LongFileName
  1169 0000B62D 01C7                <1> 	add	edi, eax
  1170 0000B62F 46                  <1> 	inc	esi
  1171 0000B630 B105                <1> 	mov	cl, 5 ; chars 1 to 5
  1172 0000B632 F366A5              <1> 	rep	movsw
  1173 0000B635 83C603              <1> 	add	esi, 3
  1174 0000B638 A5                  <1> 	movsd	; char 6 & 7 
  1175 0000B639 A5                  <1> 	movsd	; char 8 & 9
  1176 0000B63A A5                  <1> 	movsd	; char 10 & 11
  1177 0000B63B 46                  <1> 	inc	esi
  1178 0000B63C 46                  <1> 	inc	esi 
  1179 0000B63D A5                  <1> 	movsd   ; char 12 & 13 
  1180                              <1> 
  1181                              <1> loc_pslnsc_retn:
  1182 0000B63E 58                  <1>  	pop	eax
  1183                              <1> 	;pop	edx
  1184                              <1> 	;pop	ecx
  1185                              <1> 	;pop	ebx
  1186 0000B63F 5E                  <1> 	pop	esi  
  1187 0000B640 5F                  <1> 	pop	edi
  1188                              <1>  
  1189 0000B641 C3                  <1>     	retn
  1190                              <1> 
  1191                              <1> parse_path_name:
  1192                              <1> 	; 10/02/2016
  1193                              <1> 	; 08/02/2016 (TRDOS 386 = TRDOS v2.0)
  1194                              <1> 	; 10/009/2011 ('proc_parse_pathname')
  1195                              <1> 	; 27/11/2009
  1196                              <1> 	; 05/12/2004
  1197                              <1> 	;
  1198                              <1> 	; INPUT ->
  1199                              <1> 	;	ESI = Beginning of ASCIIZ pathname string
  1200                              <1> 	;       EDI = Destination Address
  1201                              <1> 	;	      (which is TR-DOS FindFile data buffer)
  1202                              <1> 	; OUTPUT ->
  1203                              <1> 	;	CF = 1 -> Error
  1204                              <1> 	;	     EAX = Error Code (AL)
  1205                              <1> 	;
  1206                              <1> 	; (Modified registers: eax, ecx, esi, edi) 
  1207                              <1> 	
  1208                              <1> 	; Clear the pathname bytes in TR-DOS Findfile data buffer 
  1209 0000B642 57                  <1> 	push	edi
  1210 0000B643 B914000000          <1> 	mov	ecx, 20  ; 80 bytes
  1211 0000B648 31C0                <1> 	xor	eax, eax
  1212 0000B64A F3AB                <1> 	rep	stosd 
  1213 0000B64C 5F                  <1> 	pop	edi
  1214                              <1> 
  1215 0000B64D 668B06              <1> 	mov	ax, [esi]
  1216 0000B650 80FC3A              <1> 	cmp	ah, ':'
  1217 0000B653 741C                <1> 	je	short loc_ppn_change_drive
  1218 0000B655 A0[56820100]        <1> 	mov	al, [Current_Drv]
  1219 0000B65A EB33                <1> 	jmp	short pass_ppn_change_drive
  1220                              <1> 
  1221                              <1> pass_ppn_cdir:
  1222 0000B65C 8B35[768B0100]      <1> 	mov	esi, [First_Path_Pos]
  1223 0000B662 AC                  <1> 	lodsb
  1224                              <1> loc_ppn_get_filename:
  1225 0000B663 83C741              <1> 	add	edi, 65 ; FindFile_Name location
  1226                              <1> 	; TRDOS Filename length must not be more than 12 bytes
  1227                              <1> 	;mov	ecx, 12
  1228 0000B666 B10C                <1> 	mov	cl, 12
  1229                              <1> loc_ppn_get_fnchar_next:
  1230 0000B668 AA                  <1> 	stosb
  1231 0000B669 AC                  <1> 	lodsb
  1232 0000B66A 3C21                <1> 	cmp	al, 21h
  1233 0000B66C 7274                <1> 	jb	short loc_ppn_clc_return 
  1234 0000B66E E2F8                <1>         loop    loc_ppn_get_fnchar_next
  1235                              <1> loc_ppn_return:
  1236 0000B670 C3                  <1> 	retn
  1237                              <1> 
  1238                              <1> loc_ppn_change_drive:
  1239 0000B671 24DF                <1> 	and	al, 0DFh
  1240 0000B673 2C41                <1> 	sub	al, 'A'; A:
  1241 0000B675 726F                <1> 	jc	short loc_ppn_invalid_drive
  1242 0000B677 3805[22380100]      <1> 	cmp	[Last_DOS_DiskNo], al
  1243 0000B67D 7267                <1> 	jb	short loc_ppn_invalid_drive
  1244                              <1> 
  1245 0000B67F 46                  <1> 	inc	esi
  1246 0000B680 46                  <1> 	inc	esi
  1247 0000B681 8A26                <1> 	mov	ah, [esi]
  1248 0000B683 80FC21              <1> 	cmp	ah, 21h
  1249 0000B686 7307                <1> 	jnb	short pass_ppn_change_drive
  1250                              <1> 
  1251                              <1> loc_ppn_cmd_failed:
  1252                              <1> 	; File or directory name is not existing
  1253 0000B688 8807                <1> 	mov	[edi], al ; Drv 
  1254 0000B68A 66B80100            <1> 	mov	ax, 1 ; eax = 1
  1255                              <1> 	; TR-DOS Error Code 01h = Bad Command Argument
  1256                              <1> 	; MS-DOS Error Code 01h : Invalid Function Number
  1257                              <1> 	;stc
  1258                              <1> 	; (MainProg ErrMsg: "Bad command or file name!")
  1259 0000B68E C3                  <1> 	retn
  1260                              <1> 
  1261                              <1> pass_ppn_change_drive:
  1262 0000B68F 8935[768B0100]      <1> 	mov	[First_Path_Pos], esi
  1263 0000B695 C705[7A8B0100]0000- <1> 	mov	dword [Last_Slash_Pos], 0
  1263 0000B69D 0000                <1>
  1264 0000B69F AA                  <1> 	stosb
  1265 0000B6A0 8A06                <1> 	mov	al, [esi]
  1266                              <1> loc_scan_ppn_dslash:
  1267 0000B6A2 3C2F                <1> 	cmp	al, '/'
  1268 0000B6A4 7506                <1>   	jne	short loc_scan_next_slash_pos
  1269 0000B6A6 8935[7A8B0100]      <1> 	mov	[Last_Slash_Pos], esi
  1270                              <1> loc_scan_next_slash_pos:
  1271 0000B6AC 46                  <1> 	inc	esi
  1272 0000B6AD 8A06                <1> 	mov	al, [esi]
  1273 0000B6AF 3C20                <1> 	cmp	al, 20h
  1274 0000B6B1 77EF                <1> 	ja	short loc_scan_ppn_dslash
  1275 0000B6B3 833D[7A8B0100]00    <1> 	cmp	dword [Last_Slash_Pos], 0
  1276 0000B6BA 76A0                <1> 	jna	short pass_ppn_cdir
  1277                              <1> 	
  1278 0000B6BC 8B0D[7A8B0100]      <1> 	mov	ecx, [Last_Slash_Pos]
  1279 0000B6C2 8B35[768B0100]      <1> 	mov	esi, [First_Path_Pos]
  1280 0000B6C8 29F1                <1> 	sub	ecx, esi
  1281 0000B6CA 41                  <1> 	inc	ecx
  1282                              <1> 	;cmp	ecx, 64
  1283 0000B6CB 80F940              <1> 	cmp	cl, 64
  1284 0000B6CE 7715                <1> 	ja	short loc_ppn_invalid_drive_stc
  1285                              <1> 
  1286 0000B6D0 89F8                <1> 	mov	eax, edi ; Dest Dir String Location (65 byte)
  1287 0000B6D2 F3A4                <1> 	rep	movsb
  1288                              <1> 	;mov	[edi], cl ; 0, End of Dir String
  1289 0000B6D4 8B35[7A8B0100]      <1> 	mov	esi, [Last_Slash_Pos]
  1290 0000B6DA 46                  <1> 	inc	esi
  1291 0000B6DB 89C7                <1> 	mov	edi, eax
  1292 0000B6DD AC                  <1> 	lodsb
  1293 0000B6DE 3C21                <1> 	cmp	al, 21h
  1294 0000B6E0 7381                <1> 	jnb	short loc_ppn_get_filename
  1295                              <1> loc_ppn_clc_return:
  1296                              <1> 	;clc
  1297 0000B6E2 31C0                <1> 	xor	eax, eax
  1298 0000B6E4 C3                  <1> 	retn
  1299                              <1> 
  1300                              <1> loc_ppn_invalid_drive_stc:
  1301 0000B6E5 F5                  <1> 	cmc	 ; stc
  1302                              <1> loc_ppn_invalid_drive:
  1303                              <1> 	; cf = 1
  1304                              <1> 	; The Drive Letter/Char < "A" or > "Z"
  1305 0000B6E6 66B80F00            <1> 	mov	ax, 0Fh
  1306                              <1> 	; MS-DOS Error Code 0Fh = Disk Drive Invalid 
  1307                              <1> 	; (MainProg ErrMsg: "Drive not ready or read error!")
  1308 0000B6EA C3                  <1> 	retn
  1309                              <1> 
  1310                              <1> find_longname:
  1311                              <1> 	; 13/02/2016 (TRDOS 386 = TRDOS v2.0)
  1312                              <1> 	; 24/01/2010 (DIR.ASM, 'proc_find_longname')
  1313                              <1> 	; 17/10/2009
  1314                              <1> 	
  1315                              <1> 	; INPUT -> 
  1316                              <1> 	;	ESI = DOS short file name address
  1317                              <1> 	; 	for example: "filename.ext"
  1318                              <1> 	;
  1319                              <1> 	; OUTPUT ->
  1320                              <1> 	; 	ESI = ASCIIZ longname address (cf = 0)
  1321                              <1> 	;	cf = 1 -> error number returns in EAX (AL)
  1322                              <1> 	;	AL = 0 & CF=1 -> longname not found
  1323                              <1> 	;	     the file/directory has no longname
  1324                              <1> 	; 	cf = 0 -> AL = FAT Type 
  1325                              <1>  
  1326                              <1> 	; 17/10/2009
  1327                              <1> 	; ASCIIZ string will be returned
  1328                              <1> 	; as LongFileName
  1329                              <1> 	; clearing/reset is not needed
  1330                              <1> 	;mov	ecx, 33
  1331                              <1> 	;mov	edi, LongFileName
  1332                              <1> 	;sub	ax, ax ; 0
  1333                              <1> 	;rep	stosw
  1334                              <1> 
  1335                              <1> 	;mov	byte [LongNameFound], 0
  1336                              <1> 
  1337                              <1> 	; ESI = ASCIIZ file/directory name address
  1338                              <1> 	;   AL = Attributes AND mask 
  1339                              <1> 	;	(Result of AND must be equal to AL)
  1340                              <1> 	;   AH = Negative attributes mask 
  1341                              <1> 	;	(Result of AND must be ZERO)
  1342 0000B6EB 66B80008            <1> 	mov	ax, 0800h 
  1343                              <1> 		; it must not be volume name or longname
  1344 0000B6EF E87DDDFFFF          <1> 	call	find_first_file
  1345 0000B6F4 7216                <1> 	jc	short loc_fln_retn
  1346                              <1>  
  1347                              <1> loc_fln_check_FAT_Type:
  1348 0000B6F6 803D[55820100]01    <1> 	cmp	byte [Current_FATType], 1
  1349 0000B6FD 7306                <1> 	jnb	short loc_fln_check_longname_yes_sign
  1350                              <1> 
  1351 0000B6FF E839000000          <1> 	call	get_fs_longname
  1352 0000B704 C3                  <1> 	retn
  1353                              <1> 
  1354                              <1> loc_fln_check_longname_yes_sign:
  1355 0000B705 08FF                <1> 	or	bh, bh
  1356 0000B707 7504                <1> 	jnz	short loc_fln_check_longnamefound_number
  1357                              <1> loc_fln_longname_not_found_retn:
  1358 0000B709 31C0                <1> 	xor	eax, eax 
  1359                              <1> 	; cf = 1 & al = 0 -> longname not found
  1360 0000B70B F9                  <1> 	stc
  1361                              <1> loc_fln_retn:
  1362 0000B70C C3                  <1> 	retn
  1363                              <1> 
  1364                              <1> loc_fln_check_longnamefound_number:
  1365                              <1> 	; 'LongNameFound' is set by
  1366                              <1>         ; by 'save_longname_sub_component'
  1367                              <1> 	; which is called from
  1368                              <1> 	; 'find_directory_entry' 
  1369                              <1> 	; which is called from 
  1370                              <1> 	; 'find_first_file'
  1371                              <1> 	; It must 1 if the longname is valid
  1372 0000B70D 803D[518A0100]01    <1>         cmp     byte [LongNameFound], 1
  1373 0000B714 75F3                <1> 	jne	short loc_fln_longname_not_found_retn
  1374                              <1>              
  1375                              <1> loc_fln_calculate_checksum: 
  1376 0000B716 E813000000          <1> 	call	calculate_checksum
  1377                              <1> 	; AL = shortname checksum
  1378                              <1> 
  1379                              <1> loc_fln_longname_validation:
  1380                              <1> 	; 'LFN_CheckSum' has been set already
  1381                              <1> 	; by 'save_longname_sub_component'
  1382                              <1> 	; which is called from
  1383                              <1> 	; 'find_directory_entry' 
  1384                              <1> 	; which is called from 
  1385                              <1> 	; 'find_first_file'
  1386 0000B71B 3805[538A0100]      <1> 	cmp	[LFN_CheckSum], al
  1387 0000B721 75E6                <1> 	jne	short loc_fln_longname_not_found_retn
  1388                              <1> 
  1389 0000B723 BE[548A0100]        <1> 	mov	esi, LongFileName
  1390 0000B728 A0[55820100]        <1> 	mov	al, [Current_FATType]
  1391 0000B72D C3                  <1> 	retn
  1392                              <1> 
  1393                              <1> calculate_checksum:
  1394                              <1> 	; 13/02/2016 (TRDOS 386 = TRDOS v2.0)
  1395                              <1> 	; 17/10/2009 (DIR.ASM, 'proc_calculate_checksum')
  1396                              <1>         ;    
  1397                              <1> 	; INPUT ->
  1398                              <1> 	;	ESI = 11 byte DOS File Name location
  1399                              <1> 	;	(in DOS Directory Entry Format)
  1400                              <1> 	; OUTPUT ->
  1401                              <1> 	;	 AL = 8 bit checksum (CRC) value
  1402                              <1> 	;
  1403                              <1> 	; (Modified registers: EAX, ECX, ESI)
  1404                              <1> 
  1405                              <1> 	; Erdogan Tan [ 17-10-2009 ]
  1406                              <1> 	;  'ror al, 1' instruction
  1407                              <1> 
  1408                              <1> 	; Erdogan Tan [ 20-06-2004 ]
  1409                              <1> 	; This 8086 assembly code is an original code
  1410                              <1> 	; which is adapted from C code in
  1411                              <1> 	; Microsoft FAT32 File System Specification
  1412                              <1> 	; Version 1.03, December 6, 2000
  1413                              <1> 	; Page 28
  1414                              <1> 
  1415 0000B72E 30C0                <1> 	xor	al, al
  1416 0000B730 B90B000000          <1> 	mov	ecx, 11
  1417                              <1> loc_next_sum:
  1418                              <1> 	;xor	ah, ah
  1419                              <1> 	;test	al, 1
  1420                              <1> 	;jz	short pass_ah_80h
  1421                              <1> 	;mov	ah, 80h
  1422                              <1> ;pass_ah_80h:
  1423                              <1> 	;shr	al, 1
  1424 0000B735 D0C8                <1> 	ror	al, 1 ; 17/10/2009  
  1425 0000B737 0206                <1> 	add	al, [esi]
  1426 0000B739 46                  <1> 	inc	esi
  1427                              <1> 	;add	al, ah
  1428 0000B73A E2F9                <1> 	loop	loc_next_sum
  1429 0000B73C C3                  <1> 	retn
  1430                              <1> 
  1431                              <1> get_fs_longname:
  1432                              <1> 	; temporary (13/02/2016)
  1433 0000B73D 31C0                <1> 	xor eax, eax
  1434 0000B73F F9                  <1> 	stc
  1435 0000B740 C3                  <1> 	retn
  1436                              <1> 
  1437                              <1> make_sub_directory:
  1438                              <1> 	; 16/10/2016
  1439                              <1> 	; 02/03/2016, 03/03/2016
  1440                              <1> 	; 26/02/2016, 27/02/2016
  1441                              <1> 	; 21/02/2016 (TRDOS 386 = TRDOS v2.0)
  1442                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_make_directory')
  1443                              <1> 	; 10/07/2010
  1444                              <1> 	; INPUT ->
  1445                              <1> 	; 	ESI = ASCIIZ Directory Name
  1446                              <1> 	;	CL = Directory Attributes
  1447                              <1> 	; OUTPUT ->
  1448                              <1> 	;	EAX = New sub dir's first cluster
  1449                              <1> 	;	ESI = Logical Dos Drv Descr. Table Addr.
  1450                              <1> 	;	CF = 1 -> error code in AL (EAX)
  1451                              <1> 
  1452                              <1> 	;test	cl, 10h  ; directory
  1453                              <1> 	;jz	short loc_make_directory_access_denied
  1454                              <1> 	;test	cl, 08h ; volume name
  1455                              <1> 	;jnz	short loc_make_directory_access_denied
  1456                              <1> 
  1457 0000B741 80E107              <1> 	and	cl, 07h
  1458 0000B744 880D[D08B0100]      <1> 	mov	byte [mkdir_attrib], cl
  1459                              <1> 
  1460 0000B74A 56                  <1> 	push	esi
  1461 0000B74B 31DB                <1> 	xor	ebx, ebx
  1462 0000B74D 8A3D[56820100]      <1> 	mov	bh, [Current_Drv]
  1463 0000B753 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1464 0000B758 01DE                <1> 	add	esi, ebx
  1465 0000B75A 5B                  <1> 	pop	ebx
  1466                              <1> 
  1467                              <1> 	; 10/07/2010 -> 1st writable disk check for trdos
  1468                              <1> 	; LD_DiskType = 0 for write protection (read only) 
  1469 0000B75B 807E0101            <1> 	cmp	byte [esi+LD_DiskType], 1 ; 0 = Invalid
  1470 0000B75F 730B                <1> 	jnb	short loc_mkdir_check_file_sytem
  1471                              <1> 	; 16/10/2016 (13h -> 30)
  1472 0000B761 B81E000000          <1> 	mov	eax, 30 ; 'Disk write-protected' error
  1473 0000B766 BA00000000          <1> 	mov	edx, 0
  1474                              <1> 	; err retn: EDX = 0, EBX = Dir name offset
  1475                              <1> 	;ESI = Logical DOS drive description table address
  1476 0000B76B C3                  <1> 	retn
  1477                              <1> 
  1478                              <1> ;loc_make_directory_access_denied:
  1479                              <1> 	;mov	ax, 05h ; access denied (invalid attributes input)
  1480                              <1> 	;stc
  1481                              <1> 	;retn
  1482                              <1> 
  1483                              <1> loc_mkdir_check_file_sytem:
  1484 0000B76C 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  1485 0000B770 730B                <1> 	jnb	short loc_mkdir_check_free_sectors
  1486                              <1> 
  1487                              <1> loc_make_fs_directory:
  1488 0000B772 A1[50820100]        <1> 	mov	eax, [Current_Dir_FCluster]
  1489                              <1> 	; EAX = Parent directory DDT Address
  1490                              <1> 	; ESI = Logical DOS Drive DT Address
  1491                              <1> 	; EBX = Directory name offset (as ASCIIZ name)
  1492 0000B777 E8D5150000          <1> 	call	make_fs_directory
  1493 0000B77C C3                  <1> 	retn
  1494                              <1> 
  1495                              <1> loc_mkdir_check_free_sectors:
  1496 0000B77D 0FB64613            <1>         movzx   eax, byte [esi+LD_BPB+SecPerClust]
  1497 0000B781 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  1498 0000B784 39C1                <1> 	cmp	ecx, eax
  1499 0000B786 7255                <1> 	jb	short loc_mkdir_insufficient_disk_space
  1500                              <1> 
  1501                              <1> loc_make_fat_directory:
  1502 0000B788 891D[C08B0100]      <1> 	mov	[mkdir_DirName_Offset], ebx
  1503 0000B78E 890D[CC8B0100]      <1> 	mov	[mkdir_FreeSectors], ecx
  1504                              <1> 
  1505                              <1> 	;mov	al, [esi+LD_BPB+SecPerClust]
  1506 0000B794 A2[D28B0100]        <1> 	mov	byte [mkdir_SecPerClust], al
  1507                              <1> 
  1508                              <1> loc_mkdir_gffc_1:
  1509 0000B799 E80F180000          <1> 	call	get_first_free_cluster
  1510 0000B79E 722A                <1> 	jc	short loc_mkdir_gffc_retn
  1511                              <1> 
  1512                              <1> ;loc_mkdir_gffc_1_cont: 
  1513                              <1> 	;cmp	eax, 2
  1514                              <1> 	;jb	short loc_mkdir_gffc_insufficient_disk_space
  1515                              <1> 
  1516                              <1> ;loc_mkdir_gffc_1_save_fcluster:  
  1517 0000B7A0 A3[C48B0100]        <1> 	mov	[mkdir_FFCluster], eax
  1518                              <1> 
  1519                              <1> loc_mkdir_locate_ffe:
  1520                              <1> 	; Current directory fcluster <> Directory buffer cluster
  1521                              <1> 	; Current directory will be reloaded by
  1522                              <1> 	; 'locate_current_dir_file' procedure
  1523                              <1> 	;
  1524                              <1> 	; ESI = Logical DOS Drive Description Table Address 
  1525                              <1> 	;push	esi ; 27/02/2016
  1526 0000B7A5 31C0                <1> 	xor	eax, eax
  1527 0000B7A7 89C1                <1>         mov	ecx, eax
  1528 0000B7A9 6649                <1> 	dec	cx ; FFFFh  
  1529                              <1> 	; CX = FFFFh -> find first deleted or free entry
  1530                              <1> 	; ESI would be ASCIIZ filename address if the call
  1531                              <1> 	; would not be for first free or deleted dir entry
  1532 0000B7AB E8D0FAFFFF          <1> 	call	locate_current_dir_file
  1533 0000B7B0 734C                <1> 	jnc	short loc_mkdir_set_ff_dir_entry_1
  1534                              <1> 	;pop	esi 
  1535                              <1> 	; ESI = Logical DOS Drive Description Table Address 
  1536 0000B7B2 83F802              <1> 	cmp	eax, 2  ; cmp al, 2 ; File/Dir not found !
  1537 0000B7B5 752B                <1> 	jne	short loc_mkdir_stc_return
  1538                              <1> 
  1539                              <1> loc_mkdir_add_new_cluster:
  1540 0000B7B7 3805[55820100]      <1> 	cmp	byte [Current_FATType], al ; 2
  1541                              <1> 	;cmp	byte ptr [esi+LD_FATType], 2
  1542 0000B7BD 770C                <1> 	ja	short loc_mkdir_add_new_cluster_check_fsc
  1543 0000B7BF 803D[54820100]01    <1> 	cmp	byte [Current_Dir_Level], 1
  1544                              <1> 	;cmp	byte [esi+LD_CDirLevel], 1
  1545 0000B7C6 7303                <1> 	jnb	short loc_mkdir_add_new_cluster_check_fsc
  1546                              <1> 
  1547 0000B7C8 B00C                <1> 	mov	al, 12 ; No more files 
  1548                              <1> loc_mkdir_gffc_retn:
  1549 0000B7CA C3                  <1> 	retn
  1550                              <1> 
  1551                              <1> loc_mkdir_add_new_cluster_check_fsc:
  1552 0000B7CB 8B0D[CC8B0100]      <1> 	mov	ecx, [mkdir_FreeSectors]
  1553                              <1> 	;movzx	eax, byte [mkdir_SecPerClust]
  1554 0000B7D1 A0[D28B0100]        <1> 	mov	al, [mkdir_SecPerClust]
  1555 0000B7D6 66D1E0              <1> 	shl	ax, 1 ; AX = 2 * AX
  1556 0000B7D9 39C1                <1> 	cmp	ecx, eax
  1557 0000B7DB 7350                <1> 	jnb	short loc_mkdir_add_new_subdir_cluster
  1558                              <1> 
  1559                              <1> loc_mkdir_insufficient_disk_space:
  1560                              <1> 	;mov	edx, ecx
  1561                              <1> ;loc_mkdir_gffc_insufficient_disk_space:
  1562 0000B7DD 66B82700            <1> 	mov	ax, 27h ; MSDOS err => insufficient disk space
  1563                              <1> 	; err retn: EDX = Free sectors, EBX = Dir name offset
  1564                              <1>         ; ESI -> Dos drive description table address
  1565                              <1> 	;; ecx = edx
  1566                              <1> 	;
  1567 0000B7E1 C3                  <1> 	retn
  1568                              <1> 
  1569                              <1> loc_mkdir_stc_return:
  1570 0000B7E2 F9                  <1> 	stc
  1571 0000B7E3 C3                  <1> 	retn 
  1572                              <1> 
  1573                              <1> loc_mkdir_gffc_2:
  1574 0000B7E4 E8C4170000          <1> 	call	get_first_free_cluster
  1575 0000B7E9 72DF                <1> 	jc	short loc_mkdir_gffc_retn
  1576                              <1> 
  1577                              <1> ;loc_mkdir_gffc_1_cont: 
  1578                              <1> 	;cmp	eax, 2
  1579                              <1> 	;jb	short loc_mkdir_gffc_insufficient_disk_space
  1580                              <1> 
  1581                              <1> ;loc_mkdir_gffc_2_save_fcluster:  
  1582 0000B7EB A3[C48B0100]        <1> 	mov	[mkdir_FFCluster], eax
  1583                              <1> 
  1584 0000B7F0 A1[C88B0100]        <1> 	mov	eax, [mkdir_LastDirCluster]
  1585                              <1> 
  1586 0000B7F5 E842170000          <1> 	call	load_FAT_sub_directory 
  1587 0000B7FA 72CE                <1> 	jc	short loc_mkdir_gffc_retn
  1588                              <1> 
  1589 0000B7FC 31FF                <1> 	xor	edi, edi
  1590                              <1> loc_mkdir_set_ff_dir_entry_1:
  1591                              <1> 	; 27/02/2016
  1592 0000B7FE 56                  <1> 	push	esi ; Logical DOS Drv Desc. Tbl. address
  1593                              <1> 	; EDI = Directory Entry Address
  1594 0000B7FF 8B35[C08B0100]      <1> 	mov	esi, [mkdir_DirName_Offset]
  1595 0000B805 A1[C48B0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1596                              <1> 
  1597 0000B80A 66B91000            <1> 	mov	cx, 10h	; CL = Directory attribute
  1598                              <1> 			; CH = 0 -> File size is 0
  1599 0000B80E 0A0D[D08B0100]      <1> 	or	cl, [mkdir_attrib] ; S, H, R  
  1600 0000B814 E8B0010000          <1> 	call	make_directory_entry
  1601                              <1> 
  1602 0000B819 5E                  <1> 	pop	esi
  1603                              <1> 
  1604 0000B81A C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1605 0000B821 E880020000          <1> 	call	save_directory_buffer
  1606 0000B826 0F83DA000000        <1>         jnc     loc_mkdir_set_ff_dir_entry_2
  1607                              <1> 
  1608                              <1> loc_mkdir_return:
  1609 0000B82C C3                  <1> 	retn
  1610                              <1> 
  1611                              <1> loc_mkdir_add_new_subdir_cluster:
  1612 0000B82D 8B15[81890100]      <1> 	mov	edx, [DirBuff_Cluster]
  1613 0000B833 8915[C88B0100]      <1> 	mov	[mkdir_LastDirCluster], edx       
  1614                              <1> 
  1615 0000B839 A1[C48B0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1616 0000B83E E8F9160000          <1> 	call	load_FAT_sub_directory 
  1617 0000B843 72E7                <1> 	jc	short loc_mkdir_return
  1618                              <1> 	; eax = 0
  1619                              <1> 	; ecx =  directory buffer sector count (<= 128)
  1620                              <1> 
  1621                              <1> pass_mkdir_add_new_subdir_cluster:
  1622 0000B845 29FF                <1> 	sub	edi, edi ; 0
  1623                              <1> 	;mov	al, 128 ; double word
  1624                              <1> 	;mul	ecx ; ecx =  directory buffer sector count
  1625                              <1> 	;mov	ecx, eax
  1626                              <1> 	;shl	cx, 7 ; 128 * sector count	
  1627 0000B847 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec] ; 512
  1628 0000B84B 66C1E802            <1> 	shr	ax, 2 ; 'byte count / 4' for 'stosd'
  1629 0000B84F 66F7E1              <1> 	mul	cx ; max = 128*(512/4) -> 16384 (stosd)
  1630 0000B852 6689C1              <1> 	mov	cx, ax
  1631 0000B855 6629C0              <1> 	sub	ax, ax ; 0
  1632 0000B858 F3AB                <1> 	rep	stosd ; clear directory buffer
  1633                              <1> 
  1634 0000B85A C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1635 0000B861 E840020000          <1> 	call	save_directory_buffer 
  1636 0000B866 72C4                <1> 	jc	short loc_mkdir_return
  1637                              <1> 
  1638                              <1> loc_mkdir_save_added_cluster:
  1639 0000B868 A1[C88B0100]        <1> 	mov	eax, [mkdir_LastDirCluster]
  1640 0000B86D 8B0D[C48B0100]      <1> 	mov	ecx, [mkdir_FFCluster]
  1641                              <1> 	; 01/03/2016
  1642 0000B873 31D2                <1> 	xor	edx, edx
  1643 0000B875 8915[72890100]      <1> 	mov	[FAT_ClusterCounter], edx ; 0 ; reset
  1644 0000B87B E800180000          <1> 	call	update_cluster
  1645 0000B880 7304                <1> 	jnc	short loc_mkdir_save_fat_buffer_0
  1646 0000B882 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1647 0000B884 7518                <1> 	jnz	short loc_mkdir_save_fat_buffer_stc_retn
  1648                              <1> 
  1649                              <1> loc_mkdir_save_fat_buffer_0:
  1650 0000B886 A1[C48B0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1651 0000B88B A3[C88B0100]        <1> 	mov	[mkdir_LastDirCluster], eax
  1652                              <1> 
  1653 0000B890 31C9                <1> 	xor	ecx, ecx
  1654 0000B892 49                  <1> 	dec	ecx ; FFFFFFFFh
  1655                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1656 0000B893 E8E8170000          <1> 	call	update_cluster
  1657 0000B898 731A                <1> 	jnc	short loc_mkdir_save_fat_buffer_1
  1658 0000B89A 09C0                <1> 	or	eax, eax
  1659 0000B89C 7416                <1> 	jz	short loc_mkdir_save_fat_buffer_1
  1660                              <1> 
  1661                              <1> loc_mkdir_save_fat_buffer_stc_retn:
  1662                              <1> 	; 01/03/2016
  1663 0000B89E 803D[72890100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1664 0000B8A5 720C                <1> 	jb	short loc_mkdir_save_fat_buffer_retn
  1665                              <1> 
  1666 0000B8A7 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space (BL = 0)
  1667                              <1> 			   ; (BH = FFh -> Use ESI as Drv Param. Tbl.)
  1668 0000B8AB 50                  <1> 	push	eax
  1669 0000B8AC E8211B0000          <1> 	call	calculate_fat_freespace
  1670 0000B8B1 58                  <1> 	pop	eax
  1671 0000B8B2 F9                  <1> 	stc
  1672                              <1> loc_mkdir_save_fat_buffer_retn:
  1673 0000B8B3 C3                  <1> 	retn
  1674                              <1> 
  1675                              <1> loc_mkdir_save_fat_buffer_1:
  1676                              <1> 	; byte [FAT_BuffValidData] = 2 
  1677 0000B8B4 E8841A0000          <1> 	call	save_fat_buffer
  1678 0000B8B9 72E3                <1> 	jc	short loc_mkdir_save_fat_buffer_stc_retn
  1679                              <1> 
  1680                              <1> 	; 01/03/2016
  1681 0000B8BB 803D[72890100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1682 0000B8C2 721B                <1> 	jb	short loc_mkdir_save_fat_buffer_2
  1683                              <1> 
  1684                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1685 0000B8C4 A1[72890100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1686 0000B8C9 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  1687 0000B8CD E8001B0000          <1> 	call	calculate_fat_freespace
  1688                              <1> 
  1689                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  1690                              <1> 	;jnz	short loc_mkdir_save_fat_buffer_2
  1691                              <1> 
  1692                              <1> 	; ecx > 0 -> Recalculation is needed
  1693 0000B8D2 09C9                <1> 	or	ecx, ecx 
  1694 0000B8D4 7409                <1> 	jz	short loc_mkdir_save_fat_buffer_2
  1695                              <1> 
  1696 0000B8D6 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  1697 0000B8DA E8F31A0000          <1> 	call	calculate_fat_freespace
  1698                              <1> 
  1699                              <1> loc_mkdir_save_fat_buffer_2:
  1700 0000B8DF C605[D38B0100]01    <1> 	mov	byte [mkdir_add_new_cluster], 1
  1701 0000B8E6 E9C4000000          <1> 	jmp	loc_mkdir_upd_parent_dir_lmdt
  1702                              <1> 
  1703                              <1> loc_mkdir_update_sub_dir_cluster:
  1704 0000B8EB A1[C48B0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1705 0000B8F0 29C9                <1> 	sub	ecx, ecx ; 0
  1706                              <1> 	; 01/03/2016
  1707 0000B8F2 890D[72890100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; Reset
  1708 0000B8F8 49                  <1> 	dec	ecx ; 0FFFFFFFFh
  1709                              <1> 
  1710                              <1> 	; ESI = Logical DOS Drive Descisption Table address  
  1711 0000B8F9 E882170000          <1> 	call	update_cluster
  1712 0000B8FE 7379                <1> 	jnc	short loc_mkdir_save_fat_buffer_3
  1713 0000B900 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1714 0000B902 7475                <1> 	jz	short loc_mkdir_save_fat_buffer_3
  1715                              <1> 	; 01/03/2016
  1716 0000B904 EB98                <1> 	jmp	short loc_mkdir_save_fat_buffer_stc_retn
  1717                              <1> 
  1718                              <1> loc_mkdir_set_ff_dir_entry_2:
  1719                              <1> 	; ESI = Logical DOS Drive Description Table address  
  1720 0000B906 A1[C48B0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1721                              <1> 	; Load disk sectors as a directory cluster
  1722 0000B90B E82C160000          <1> 	call	load_FAT_sub_directory 
  1723 0000B910 7266                <1> 	jc	short retn_make_fat_directory
  1724                              <1> 	
  1725                              <1> 	; eax = 0
  1726                              <1> 	; ecx =  directory buffer sector count (<= 128)
  1727                              <1> 
  1728 0000B912 BF40000800          <1> 	mov	edi, Directory_Buffer + 64 ; 26/02/2016
  1729                              <1> 
  1730                              <1> 	; 02/03/2016
  1731 0000B917 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec] ; 512
  1732 0000B91B 66C1E802            <1> 	shr	ax, 2 ; 'byte count / 4' for 'stosd'
  1733 0000B91F F7E1                <1> 	mul 	ecx
  1734 0000B921 89C1                <1> 	mov	ecx, eax
  1735 0000B923 6629C0              <1> 	sub	ax, ax
  1736 0000B926 F3AB                <1> 	rep	stosd
  1737                              <1> 
  1738                              <1> 	;;mov	al, 128 ; double word
  1739                              <1> 	;;mul	ecx ; ecx =  directory buffer sector count
  1740                              <1> 	;;mov	ecx, eax
  1741                              <1> 	;shl	cx, 7 ; 128 * sector count	
  1742                              <1> 	;;sub	eax, eax
  1743                              <1> 	;;sub	al, al ; 0
  1744                              <1> 	;rep	stosd ; clear directory buffer
  1745                              <1> 
  1746 0000B928 BF00000800          <1> 	mov	edi, Directory_Buffer ; 26/02/2016
  1747                              <1> 	
  1748 0000B92D 56                  <1> 	push	esi
  1749                              <1> 
  1750 0000B92E BE[D48B0100]        <1> 	mov	esi, mkdir_Name
  1751 0000B933 66C7062E00          <1> 	mov	word [esi], 2Eh ; db '.', '0'
  1752                              <1> 
  1753 0000B938 A1[C48B0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1754 0000B93D 66B91000            <1> 	mov	cx, 10h ; CL = Directory attribute
  1755                              <1> 			; CH = 0 -> File size is 0
  1756 0000B941 E883000000          <1> 	call	make_directory_entry
  1757                              <1> 
  1758 0000B946 BF20000800          <1> 	mov	edi, Directory_Buffer + 32 ; 26/02/2016
  1759                              <1> 
  1760                              <1> 	; 03/03/2016
  1761                              <1> 	; Following modification has been done according to 
  1762                              <1> 	; 'Microsoft Extensible Firmware Initiative
  1763                              <1> 	; FAT32 File System Specification' document,
  1764                              <1> 	; 'FAT: General Overview of On-Disk FormatPage 25'.
  1765                              <1> 	; "Finally, you set DIR_FstClusLO and DIR_FstClusHI
  1766                              <1> 	; for the dotdot entry (the second entry) to the
  1767                              <1> 	; first cluster number of the directory in which you 
  1768                              <1> 	; just created the directory (value is 0 if this directory
  1769                              <1> 	; is the root directory even for FAT32 volumes)."
  1770                              <1> 	; (Correctness of this modification has been verified
  1771                              <1> 	;  by using Windows 98 'scandisk.exe'.)
  1772                              <1> 
  1773 0000B94B 29C0                <1> 	sub	eax, eax
  1774 0000B94D 3805[54820100]      <1> 	cmp	byte [Current_Dir_Level], al ; 0
  1775 0000B953 7605                <1> 	jna	short loc_mkdir_set_ff_dir_entry_3
  1776 0000B955 A1[50820100]        <1> 	mov	eax, [Current_Dir_FCluster] ; parent dir
  1777                              <1> loc_mkdir_set_ff_dir_entry_3:
  1778 0000B95A 66C746012E00        <1> 	mov	word [esi+1], 2Eh ; db '.', '0'
  1779                              <1> 
  1780                              <1> 	;mov	cx, 10h
  1781 0000B960 E864000000          <1> 	call	make_directory_entry
  1782                              <1> 
  1783 0000B965 5E                  <1> 	pop	esi
  1784                              <1> 
  1785 0000B966 C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1786 0000B96D E834010000          <1> 	call	save_directory_buffer
  1787 0000B972 0F8373FFFFFF        <1>         jnc     loc_mkdir_update_sub_dir_cluster
  1788                              <1>  
  1789                              <1> retn_make_fat_directory:
  1790 0000B978 C3                  <1> 	retn
  1791                              <1> 
  1792                              <1> loc_mkdir_save_fat_buffer_3:
  1793                              <1> 	; 01/03/2016
  1794                              <1> 	; byte [FAT_BuffValidData] = 2 
  1795 0000B979 E8BF190000          <1> 	call	save_fat_buffer
  1796 0000B97E 0F821AFFFFFF        <1>         jc      loc_mkdir_save_fat_buffer_stc_retn
  1797                              <1> 
  1798 0000B984 803D[72890100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1799 0000B98B 721B                <1> 	jb	short loc_mkdir_save_fat_buffer_4
  1800                              <1> 
  1801                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1802 0000B98D A1[72890100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1803 0000B992 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  1804 0000B996 E8371A0000          <1> 	call	calculate_fat_freespace
  1805                              <1> 
  1806                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  1807                              <1>         ;jnz    short loc_mkdir_save_fat_buffer_4
  1808                              <1> 
  1809                              <1> 	; ecx > 0 -> Recalculation is needed
  1810 0000B99B 09C9                <1> 	or	ecx, ecx 
  1811 0000B99D 7409                <1>         jz      short loc_mkdir_save_fat_buffer_4
  1812                              <1> 
  1813 0000B99F 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space
  1814 0000B9A3 E82A1A0000          <1> 	call	calculate_fat_freespace
  1815                              <1> 
  1816                              <1> loc_mkdir_save_fat_buffer_4:	
  1817 0000B9A8 C605[D38B0100]00    <1> 	mov	byte [mkdir_add_new_cluster], 0
  1818                              <1> 
  1819                              <1> loc_mkdir_upd_parent_dir_lmdt:
  1820 0000B9AF E88D010000          <1> 	call	update_parent_dir_lmdt
  1821                              <1> 
  1822                              <1> 	; 01/03/2016
  1823 0000B9B4 803D[D38B0100]00    <1> 	cmp	byte [mkdir_add_new_cluster], 0
  1824 0000B9BB 0F8723FEFFFF        <1>         ja      loc_mkdir_gffc_2
  1825                              <1> 
  1826                              <1> loc_mkdir_retn_new_dir_cluster:
  1827 0000B9C1 A1[C48B0100]        <1> 	mov	eax, [mkdir_FFCluster]
  1828 0000B9C6 31D2                <1> 	xor	edx, edx
  1829                              <1> loc_mkdir_retn:
  1830 0000B9C8 C3                  <1> 	retn
  1831                              <1> 
  1832                              <1> make_directory_entry:
  1833                              <1> 	; 02/03/2016
  1834                              <1> 	; 21/02/2016 (TRDOS 386 = TRDOS v2.0)
  1835                              <1> 	; 09/08/2010 (DIR.ASM, 'proc_make_directory_entry')
  1836                              <1> 	; 17/07/2010
  1837                              <1> 	; INPUT ->
  1838                              <1> 	; 	EDI = Directory Entry Address
  1839                              <1> 	;	ESI = Dot File Name Location
  1840                              <1> 	;	EAX = First Cluster
  1841                              <1> 	;	File Size = 0 (Must be set later)
  1842                              <1> 	;	CL = Attributes
  1843                              <1> 	;	CH = 0 (File size = 0) 
  1844                              <1> 	;	(If CH>0, File size is in dword [EBX]) (*)
  1845                              <1> 	; OUTPUT -> 
  1846                              <1> 	;	EDI = Directory Entry Address
  1847                              <1> 	;	ESI = Dot File Name Location (Capitalized)
  1848                              <1> 	;	If CH input = 0, File Size = 0
  1849                              <1> 	;	Otherwise file size is as dword [EBX] (*)
  1850                              <1> 	;	DX = Date, AX = Time in DOS Dir Entry format
  1851                              <1> 	;	EBX = same
  1852                              <1> 	;	ECX = same
  1853                              <1> 
  1854 0000B9C9 51                  <1> 	push	ecx
  1855                              <1> 
  1856 0000B9CA 884F0B              <1> 	mov	[edi+11], cl ; Attributes
  1857 0000B9CD 6689471A            <1> 	mov	[edi+26], ax ; FClusterLw, 26
  1858 0000B9D1 C1E810              <1> 	shr	eax, 16
  1859 0000B9D4 66894714            <1> 	mov	[edi+20], ax ; FClusterHw, 20
  1860 0000B9D8 6631C0              <1> 	xor	ax, ax 
  1861 0000B9DB 6689470C            <1> 	mov	[edi+12], ax ; NTReserved, 12
  1862                              <1> 			     ; CrtTimeTenth, 13
  1863 0000B9DF 08ED                <1> 	or	ch, ch
  1864 0000B9E1 7402                <1> 	jz	short loc_make_direntry_set_filesize
  1865                              <1> 
  1866 0000B9E3 8B03                <1> 	mov	eax, [ebx]
  1867                              <1>         
  1868                              <1> loc_make_direntry_set_filesize:
  1869 0000B9E5 89471C              <1> 	mov	[edi+28], eax ; FileSize, 28
  1870                              <1> 	
  1871 0000B9E8 E88AFBFFFF          <1> 	call	convert_file_name
  1872                              <1> 	;EDI = Dir Entry Format File Name Location
  1873                              <1> 	;ESI = Dot File Name Location (capitalized)
  1874                              <1> 
  1875 0000B9ED E816000000          <1> 	call	convert_current_date_time
  1876                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  1877                              <1>         ; 	    AX = Time in dos dir entry format
  1878 0000B9F2 6689470E            <1> 	mov	[edi+14], ax ; CrtTime, 14
  1879 0000B9F6 66895710            <1> 	mov	[edi+16], dx ; CrtDate, 16
  1880 0000B9FA 66895712            <1> 	mov	[edi+18], dx ; LastAccDate, 18
  1881 0000B9FE 66894716            <1> 	mov	[edi+22], ax ; WrtTime, 14
  1882 0000BA02 66895718            <1> 	mov	[edi+24], dx ; WrtDate, 16
  1883 0000BA06 59                  <1> 	pop	ecx
  1884                              <1> 
  1885 0000BA07 C3                  <1> 	retn
  1886                              <1> 
  1887                              <1> convert_current_date_time:
  1888                              <1> 	; 21/02/2016 (TRDOS 386 = TRDOS v2.0)
  1889                              <1> 	; 13/06/2010 (DIR.ASM, 'proc_convert_current_date_time')
  1890                              <1> 	; converts date&time to dos dir entry format
  1891                              <1> 	; INPUT -> none
  1892                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  1893                              <1> 	;           AX = Time in dos dir entry format
  1894                              <1>  
  1895 0000BA08 B404                <1> 	mov	ah, 04h ; Return Current Date
  1896 0000BA0A E81DB0FFFF          <1> 	call	int1Ah 
  1897                              <1> 
  1898 0000BA0F 88E8                <1> 	mov	al, ch ; <- century BCD
  1899 0000BA11 240F                <1> 	and	al, 0Fh
  1900 0000BA13 88EC                <1> 	mov	ah, ch
  1901 0000BA15 C0EC04              <1> 	shr	ah, 4
  1902 0000BA18 D50A                <1> 	aad
  1903 0000BA1A 88C5                <1> 	mov	ch, al ; -> century 
  1904                              <1> 
  1905 0000BA1C 88C8                <1> 	mov	al, cl ; <- year BCD
  1906 0000BA1E 240F                <1> 	and	al, 0Fh
  1907 0000BA20 88CC                <1> 	mov	ah, cl
  1908 0000BA22 C0EC04              <1> 	shr	ah, 4
  1909 0000BA25 D50A                <1> 	aad
  1910 0000BA27 88C1                <1> 	mov	cl, al ; -> year
  1911                              <1> 
  1912 0000BA29 88E8                <1> 	mov	al, ch
  1913 0000BA2B B464                <1> 	mov	ah, 100
  1914 0000BA2D F6E4                <1> 	mul	ah
  1915 0000BA2F 30ED                <1> 	xor	ch, ch
  1916 0000BA31 6601C8              <1> 	add	ax, cx
  1917 0000BA34 662DBC07            <1> 	sub	ax, 1980 ; ms-dos epoch
  1918 0000BA38 6689C1              <1> 	mov	cx, ax
  1919                              <1> 
  1920 0000BA3B 88F0                <1> 	mov	al, dh ; <- month in bcd
  1921 0000BA3D 240F                <1> 	and	al, 0Fh
  1922 0000BA3F 88F4                <1> 	mov	ah, dh
  1923 0000BA41 C0EC04              <1> 	shr	ah, 4
  1924 0000BA44 D50A                <1> 	aad
  1925 0000BA46 88C6                <1> 	mov	dh, al ; -> month
  1926                              <1> 
  1927 0000BA48 88D0                <1> 	mov	al, dl ; <- day BCD
  1928 0000BA4A 240F                <1> 	and	al, 0Fh
  1929 0000BA4C 88D4                <1> 	mov	ah, dl
  1930 0000BA4E C0EC04              <1> 	shr	ah, 4
  1931 0000BA51 D50A                <1> 	aad
  1932 0000BA53 88C2                <1> 	mov	dl, al ; -> day
  1933                              <1> 
  1934 0000BA55 88C8                <1> 	mov	al, cl ; count of years from 1980
  1935 0000BA57 66C1E004            <1> 	shl	ax, 4
  1936 0000BA5B 08F0                <1> 	or	al, dh ; month of year, 1 to 12
  1937 0000BA5D 66C1E005            <1> 	shl	ax, 5
  1938 0000BA61 08D0                <1> 	or	al, dl ; day of year, 1 to 31
  1939                              <1> 	
  1940 0000BA63 6650                <1> 	push	ax ; push date
  1941                              <1> 
  1942 0000BA65 B402                <1> 	mov	ah, 02h ; Return Current Time
  1943 0000BA67 E8C0AFFFFF          <1> 	call	int1Ah
  1944                              <1> 
  1945 0000BA6C 88E8                <1> 	mov	al, ch ; <- hours BCD
  1946 0000BA6E 240F                <1> 	and	al, 0Fh
  1947 0000BA70 88EC                <1> 	mov	ah, ch
  1948 0000BA72 C0EC04              <1> 	shr	ah, 4
  1949 0000BA75 D50A                <1> 	aad
  1950 0000BA77 88C5                <1> 	mov	ch, al ; -> hours
  1951                              <1> 
  1952 0000BA79 88C8                <1> 	mov	al, cl ; <- minutes BCD
  1953 0000BA7B 240F                <1> 	and	al, 0Fh
  1954 0000BA7D 88CC                <1> 	mov	ah, cl
  1955 0000BA7F C0EC04              <1> 	shr	ah, 4
  1956 0000BA82 D50A                <1> 	aad
  1957 0000BA84 88C1                <1> 	mov	cl, al ; -> minutes
  1958                              <1> 
  1959 0000BA86 88F0                <1> 	mov	al, dh ; <- seconds BCD
  1960 0000BA88 240F                <1> 	and	al, 0Fh
  1961 0000BA8A 88F4                <1> 	mov	ah, dh
  1962 0000BA8C C0EC04              <1> 	shr	ah, 4
  1963 0000BA8F D50A                <1> 	aad
  1964 0000BA91 88C6                <1> 	mov	dh, al ; -> seconds
  1965                              <1> 
  1966 0000BA93 88E8                <1> 	mov	al, ch ; hours
  1967 0000BA95 66C1E006            <1> 	shl	ax, 6
  1968 0000BA99 08C8                <1> 	or	al, cl ; minutes
  1969 0000BA9B 66C1E005            <1> 	shl	ax, 5
  1970 0000BA9F D0EE                <1> 	shr	dh, 1 ; 2 seconds
  1971                              <1> 	; There is a bug in TRDOS v1 here !
  1972                              <1> 	; it was 'or al, dl' ! 
  1973 0000BAA1 08F0                <1> 	or	al, dh ; seconds
  1974                              <1> 
  1975 0000BAA3 665A                <1> 	pop	dx ; pop date
  1976                              <1> 	
  1977 0000BAA5 C3                  <1> 	retn
  1978                              <1> 
  1979                              <1> save_directory_buffer:
  1980                              <1> 	; 15/10/2016
  1981                              <1> 	; 23/03/2016
  1982                              <1> 	; 26/02/2016
  1983                              <1> 	; 22/02/2016 (TRDOS 386 = TRDOS v2.0)
  1984                              <1> 	; 01/08/2011
  1985                              <1> 	; 14/03/2010
  1986                              <1> 	; INPUT ->
  1987                              <1> 	; 	 none
  1988                              <1> 	; OUTPUT ->
  1989                              <1> 	;  cf = 0 -> write OK...
  1990                              <1> 	;  cf = 1 -> error code in AL (EAX)
  1991                              <1> 	;  cf = 1 & AL = 0Dh => CH & CL = FS & FAT type
  1992                              <1> 	;  EBX = Directory Buffer Address
  1993                              <1> 	;
  1994                              <1> 	;  (EAX, ECX, EDX will be modified)
  1995                              <1>  
  1996 0000BAA6 BB00000800          <1> 	mov	ebx, Directory_Buffer
  1997 0000BAAB 803D[7C890100]02    <1> 	cmp	byte [DirBuff_ValidData], 2
  1998 0000BAB2 7403                <1> 	je	short loc_save_dir_buffer
  1999 0000BAB4 31C0                <1> 	xor	eax, eax
  2000 0000BAB6 C3                  <1> 	retn            
  2001                              <1> 
  2002                              <1> loc_save_dir_buffer:
  2003 0000BAB7 56                  <1> 	push	esi
  2004 0000BAB8 31DB                <1> 	xor	ebx, ebx 
  2005 0000BABA 8A3D[7A890100]      <1>         mov     bh, [DirBuff_DRV]
  2006 0000BAC0 80EF41              <1> 	sub	bh, 'A'
  2007 0000BAC3 BE00010900          <1>         mov     esi, Logical_DOSDisks
  2008 0000BAC8 01DE                <1> 	add	esi, ebx
  2009 0000BACA 668B4E03            <1>         mov     cx, [esi+LD_FATType]
  2010                              <1> 	; CH = FS Type (A1h for FS)
  2011                              <1> 	; CL = FAT Type (0 for FS)
  2012 0000BACE 08C9                <1> 	or	cl, cl
  2013 0000BAD0 7433                <1> 	jz	short loc_save_dir_buff_stc_retn
  2014                              <1> 
  2015                              <1> loc_save_dir_buffer_check_cluster_no:    
  2016 0000BAD2 A1[81890100]        <1> 	mov	eax, [DirBuff_Cluster]
  2017 0000BAD7 28FF                <1> 	sub	bh, bh ; ebx = 0
  2018 0000BAD9 09C0                <1> 	or	eax, eax
  2019 0000BADB 7540                <1> 	jnz	short loc_save_sub_dir_buffer
  2020 0000BADD 8A25[7B890100]      <1> 	mov	ah, [DirBuff_FATType]
  2021 0000BAE3 FEC3                <1> 	inc	bl ;  bl = 1
  2022 0000BAE5 38DC                <1> 	cmp	ah, bl
  2023 0000BAE7 721D                <1> 	jb	short loc_save_dir_buff_inv_data_retn
  2024 0000BAE9 FEC3                <1> 	inc	bl ; bl = 2
  2025 0000BAEB 38E3                <1> 	cmp	bl, ah
  2026 0000BAED 7217                <1> 	jb	short loc_save_dir_buff_inv_data_retn
  2027                              <1> 
  2028                              <1> loc_save_root_dir_buffer:
  2029 0000BAEF 668B5E17            <1> 	mov	bx, [esi+LD_BPB+RootDirEnts]
  2030 0000BAF3 6683C30F            <1> 	add	bx, 15
  2031 0000BAF7 66C1EB04            <1> 	shr	bx, 4 ; 16 dir entries per sector
  2032 0000BAFB 6609DB              <1> 	or	bx, bx
  2033 0000BAFE 7405                <1> 	jz	short loc_save_dir_buff_stc_retn
  2034                              <1> 	;mov	ecx, ebx 
  2035 0000BB00 8B4664              <1> 	mov	eax, [esi+LD_ROOTBegin] ; 26/02/2016
  2036 0000BB03 EB23                <1> 	jmp	short loc_write_directory_to_disk
  2037                              <1> 
  2038                              <1> loc_save_dir_buff_stc_retn:
  2039 0000BB05 F9                  <1> 	stc
  2040                              <1> loc_save_dir_buff_inv_data_retn:
  2041                              <1> 	; 15/10/2016 (0Dh -> 29)
  2042 0000BB06 B01D                <1> 	mov	al, 29 ; Invalid data !
  2043 0000BB08 C605[7C890100]00    <1> 	mov	byte [DirBuff_ValidData], 0
  2044 0000BB0F EB05                <1> 	jmp	short loc_save_dir_buff_retn 
  2045                              <1> 
  2046                              <1> loc_write_directory_to_disk_err:
  2047                              <1> 	; 15/10/2016 (disk write error code, 1Dh -> 18)
  2048 0000BB11 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error 
  2049                              <1> 
  2050                              <1> loc_save_dir_buff_retn:
  2051 0000BB16 BB00000800          <1> 	mov	ebx, Directory_Buffer
  2052 0000BB1B 5E                  <1> 	pop	esi
  2053 0000BB1C C3                  <1> 	retn
  2054                              <1>  
  2055                              <1> loc_save_sub_dir_buffer:
  2056                              <1> 	; ebx  = 0
  2057 0000BB1D 83E802              <1> 	sub	eax, 2
  2058 0000BB20 8A5E13              <1> 	mov	bl, [esi+LD_BPB+SecPerClust]
  2059 0000BB23 F7E3                <1> 	mul	ebx
  2060 0000BB25 034668              <1>         add     eax, [esi+LD_DATABegin]
  2061                              <1>  	;mov	ecx, ebx
  2062                              <1> 
  2063                              <1> loc_write_directory_to_disk:
  2064 0000BB28 89D9                <1>  	mov	ecx, ebx
  2065 0000BB2A BB00000800          <1> 	mov	ebx, Directory_Buffer
  2066 0000BB2F E8DA670000          <1> 	call	disk_write
  2067 0000BB34 72DB                <1> 	jc	short loc_write_directory_to_disk_err
  2068                              <1> 
  2069                              <1> loc_save_dir_buff_validate_retn:
  2070 0000BB36 C605[7C890100]01    <1> 	mov	byte [DirBuff_ValidData], 1
  2071 0000BB3D 31C0                <1> 	xor	eax, eax
  2072                              <1> 	; 26/02/2016
  2073 0000BB3F EBD5                <1> 	jmp	short loc_save_dir_buff_retn
  2074                              <1> 
  2075                              <1> update_parent_dir_lmdt:
  2076                              <1> 	; 29/12/2017
  2077                              <1> 	; 22/02/2016 (TRDOS 386 = TRDOS v2.0)
  2078                              <1> 	; 01/08/2011
  2079                              <1> 	; 16/10/2010 
  2080                              <1> 	; 
  2081                              <1> 	; INPUT -> 
  2082                              <1> 	;	none
  2083                              <1>  	; OUTPUT ->
  2084                              <1> 	;	(last modification date & time of the parent dir
  2085                              <1> 	;	will be changed/updated)
  2086                              <1> 	;
  2087                              <1> 	; (EAX, EBX, ECX, EDX, EDI will be changed)
  2088                              <1> 
  2089 0000BB41 29C0                <1> 	sub	eax, eax
  2090 0000BB43 8A25[54820100]      <1> 	mov	ah, [Current_Dir_Level]
  2091 0000BB49 A0[55820100]        <1> 	mov	al, [Current_FATType]
  2092 0000BB4E 3C01                <1> 	cmp	al, 1
  2093 0000BB50 723A                <1> 	jb	short loc_UPDLMDT_proc_retn
  2094                              <1>     
  2095                              <1> loc_update_parent_dir_lm_date_time:
  2096 0000BB52 08E4                <1> 	or	ah, ah
  2097 0000BB54 7436                <1> 	jz	short loc_UPDLMDT_proc_retn
  2098                              <1> 
  2099 0000BB56 56                  <1> 	push	esi ; *
  2100 0000BB57 8825[F48B0100]      <1> 	mov	[UPDLMDT_CDirLevel], ah
  2101 0000BB5D 8B15[50820100]      <1> 	mov	edx, [Current_Dir_FCluster]
  2102 0000BB63 8915[F58B0100]      <1> 	mov	[UPDLMDT_CDirFCluster], edx
  2103                              <1> 
  2104 0000BB69 FECC                <1> 	dec	ah
  2105 0000BB6B B90C000000          <1> 	mov	ecx, 12
  2106 0000BB70 BE[B3890100]        <1>         mov     esi, PATH_Array
  2107                              <1> 
  2108 0000BB75 8825[54820100]      <1> 	mov	[Current_Dir_Level], ah
  2109 0000BB7B 08E4                <1> 	or	ah, ah
  2110 0000BB7D 750E                <1> 	jnz	short loc_update_parent_dir_lmdt_load_sub_dir_1
  2111 0000BB7F 803D[55820100]02    <1> 	cmp	byte [Current_FATType], 2
  2112 0000BB86 770B                <1> 	ja	short loc_update_parent_dir_lmdt_load_sub_dir_2
  2113 0000BB88 28C0                <1> 	sub	al, al ; eax = 0
  2114 0000BB8A EB0A                <1> 	jmp	short loc_update_parent_dir_lmdt_load_sub_dir_3
  2115                              <1> 
  2116                              <1> loc_UPDLMDT_proc_retn:
  2117 0000BB8C C3                  <1> 	retn
  2118                              <1>          
  2119                              <1> loc_update_parent_dir_lmdt_load_sub_dir_1:
  2120 0000BB8D B010                <1> 	mov	al, 16
  2121 0000BB8F F6E4                <1> 	mul	ah 
  2122 0000BB91 01C6                <1> 	add	esi, eax
  2123                              <1> 
  2124                              <1> loc_update_parent_dir_lmdt_load_sub_dir_2:  
  2125 0000BB93 8B460C              <1> 	mov	eax, [esi+12] ; Parent Dir First Cluster
  2126                              <1> 
  2127                              <1> loc_update_parent_dir_lmdt_load_sub_dir_3:
  2128 0000BB96 A3[50820100]        <1> 	mov	[Current_Dir_FCluster], eax
  2129                              <1> 
  2130 0000BB9B 83C610              <1> 	add	esi, 16
  2131 0000BB9E 66BF[DA8A]          <1> 	mov	di, Dir_File_Name  
  2132 0000BBA2 F3A4                <1> 	rep	movsb
  2133                              <1> 	
  2134 0000BBA4 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2135 0000BBA9 29DB                <1> 	sub	ebx, ebx
  2136 0000BBAB 8A3D[56820100]      <1> 	mov	bh, [Current_Drv]
  2137 0000BBB1 01DE                <1> 	add	esi, ebx
  2138 0000BBB3 E88FF7FFFF          <1> 	call	reload_current_directory
  2139 0000BBB8 7230                <1> 	jc	short loc_update_parent_dir_lmdt_restore_cdirlevel
  2140                              <1> 
  2141                              <1> loc_update_parent_dir_lmdt_locate_dir: 
  2142 0000BBBA BE[DA8A0100]        <1> 	mov	esi, Dir_File_Name        
  2143 0000BBBF 6631C9              <1> 	xor	cx, cx
  2144 0000BBC2 66B81008            <1> 	mov	ax, 0810h ; Only directories
  2145 0000BBC6 E8B5F6FFFF          <1>         call    locate_current_dir_file
  2146                              <1> 	; EDI = DirBuff Directory Entry Address
  2147 0000BBCB 721D                <1> 	jc	short loc_update_parent_dir_lmdt_restore_cdirlevel
  2148                              <1> 
  2149 0000BBCD E836FEFFFF          <1> 	call	convert_current_date_time
  2150 0000BBD2 66895712            <1> 	mov	[edi+18], dx ; Last Access Date
  2151 0000BBD6 66895718            <1> 	mov	[edi+24], dx ; Last Write Date
  2152 0000BBDA 66894716            <1> 	mov	[edi+22], ax ; Last Write Time
  2153                              <1> 
  2154 0000BBDE C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  2155 0000BBE5 E8BCFEFFFF          <1> 	call	save_directory_buffer
  2156                              <1> 	; 29/12/2017
  2157                              <1> 	;jc	short loc_update_parent_dir_lmdt_restore_cdirlevel
  2158                              <1> 	;xor	al, al 
  2159                              <1> loc_update_parent_dir_lmdt_restore_cdirlevel:
  2160                              <1>  	;current directory level restoration
  2161 0000BBEA 8A25[F48B0100]      <1> 	mov	ah, [UPDLMDT_CDirLevel]
  2162 0000BBF0 8825[54820100]      <1> 	mov	[Current_Dir_Level], ah
  2163 0000BBF6 8B15[F58B0100]      <1>         mov     edx, [UPDLMDT_CDirFCluster]
  2164 0000BBFC 8915[50820100]      <1> 	mov	[Current_Dir_FCluster], edx
  2165                              <1> 
  2166 0000BC02 5E                  <1> 	pop	esi ; *
  2167 0000BC03 C3                  <1> 	retn
  2168                              <1> 
  2169                              <1> delete_longname:
  2170                              <1> 	; 27/02/2016 (TRDOS 386 = TRDOS v2.0)
  2171                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_delete_longname')
  2172                              <1> 	; 14/03/2010
  2173                              <1> 	; INPUT ->
  2174                              <1> 	; 	EAX = Directory Entry (Index) Number (< 65536)
  2175                              <1> 	; OUTPUT ->
  2176                              <1> 	;	cf = 0 -> OK  (EAX = 0)
  2177                              <1> 	; 	cf = 1 -> error code in EAX (AL)
  2178                              <1> 	;
  2179                              <1> 	; (Modified registers: EAX, EDX, ECX, EBX, EDI) 
  2180                              <1> 
  2181 0000BC04 66A3[248C0100]      <1> 	mov	[DLN_EntryNumber], ax
  2182 0000BC0A C605[268C0100]40    <1>         mov     byte [DLN_40h], 40h
  2183                              <1> 
  2184 0000BC11 E858000000          <1> 	call	locate_current_dir_entry
  2185 0000BC16 7308                <1> 	jnc	short loc_dln_check_attributes
  2186 0000BC18 C3                  <1> 	retn
  2187                              <1> 
  2188                              <1> loc_dln_longname_not_found:
  2189 0000BC19 B802000000          <1> 	mov	eax, 2
  2190 0000BC1E F9                  <1> 	stc
  2191 0000BC1F C3                  <1> 	retn
  2192                              <1> 
  2193                              <1> loc_dln_check_attributes:
  2194 0000BC20 B00F                <1> 	mov	al, 0Fh  ; long name
  2195 0000BC22 8A670B              <1> 	mov	ah, [edi+0Bh] ; dir entry attributes
  2196 0000BC25 38C4                <1> 	cmp	ah, al
  2197 0000BC27 75F0                <1> 	jne	short loc_dln_longname_not_found
  2198 0000BC29 8A27                <1> 	mov	ah, [edi]
  2199 0000BC2B 2A25[268C0100]      <1> 	sub	ah, [DLN_40h]
  2200 0000BC31 76E6                <1> 	jna	short loc_dln_longname_not_found         
  2201 0000BC33 80FC14              <1> 	cmp	ah, 14h ; 84-64=20 -> 20*13=260 bytes
  2202 0000BC36 77E1                <1> 	ja	short loc_dln_longname_not_found
  2203                              <1>              
  2204 0000BC38 C607E5              <1> 	mov	byte [edi], 0E5h  ; deleted sign
  2205 0000BC3B C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2 ; changed/write sign
  2206 0000BC42 C605[268C0100]00    <1> 	mov	byte [DLN_40h], 0 ; 40h -> 0
  2207                              <1> 	  
  2208                              <1> loc_dln_delete_next_ln_entry:
  2209 0000BC49 80FC01              <1> 	cmp	ah, 1
  2210 0000BC4C 7616                <1> 	jna	short loc_dln_longname_retn
  2211                              <1> loc_dln_delete_next_ln_entry_0:
  2212 0000BC4E 66FF05[248C0100]    <1> 	inc	word [DLN_EntryNumber]
  2213 0000BC55 0FB705[248C0100]    <1> 	movzx	eax, word [DLN_EntryNumber] 
  2214 0000BC5C E80D000000          <1> 	call	locate_current_dir_entry
  2215 0000BC61 73BD                <1> 	jnc	short loc_dln_check_attributes
  2216                              <1> 
  2217                              <1> loc_dln_longname_stc_retn:
  2218 0000BC63 C3                  <1> 	retn 
  2219                              <1> 	   
  2220                              <1> loc_dln_longname_retn:
  2221                              <1> 	;cmp	byte [DirBuff_ValidData], 2
  2222                              <1> 	;jne	short loc_dln_longname_retn_xor_eax
  2223 0000BC64 E83DFEFFFF          <1> 	call	save_directory_buffer
  2224 0000BC69 72F8                <1> 	jc	short loc_dln_longname_stc_retn
  2225                              <1> 
  2226                              <1> loc_dln_longname_retn_xor_eax:
  2227 0000BC6B 31C0                <1> 	xor	eax, eax
  2228 0000BC6D C3                  <1> 	retn
  2229                              <1> 
  2230                              <1> locate_current_dir_entry:
  2231                              <1> 	; 16/10/2016
  2232                              <1> 	; 15/10/2016
  2233                              <1> 	; 23/03/2016
  2234                              <1> 	; 27/02/2016 (TRDOS 386 = TRDOS v2.0)
  2235                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_locate_current_dir_entry')
  2236                              <1> 	; 07/03/2010
  2237                              <1> 	; INPUT ->
  2238                              <1> 	;	EAX = Directory Entry (Index) Number (< 65536) 
  2239                              <1> 	; OUTPUT ->
  2240                              <1> 	;	EDI = Directory Entry Address
  2241                              <1> 	; 	EAX = Cluster Number of Directory Buffer
  2242                              <1> 	;	EBX = Directory Buffer Entry Offset
  2243                              <1> 	;	ECX = DirBuff Valid Data identifier (CL)
  2244                              <1> 	;   	If CF = 0 and CL = 2 then
  2245                              <1> 	;	   directory buffer modified and
  2246                              <1> 	;	   must be written to disk.
  2247                              <1> 	; 	If CF = 0  and CL = 1 then
  2248                              <1> 	;	   dir buffer has been written to disk, already.
  2249                              <1> 	;	CF = 1 -> Error code in EAX (AL)
  2250                              <1> 	;
  2251                              <1> 	; (Modified registers: EAX, EDX, ECX, EBX, EDI) 
  2252                              <1> 
  2253                              <1> loc_locate_current_dir_entry:
  2254 0000BC6E 56                  <1> 	push	esi
  2255 0000BC6F 89C1                <1> 	mov	ecx, eax
  2256 0000BC71 BA20000000          <1> 	mov	edx, 32
  2257 0000BC76 F7E2                <1> 	mul	edx 
  2258 0000BC78 A3[308C0100]        <1> 	mov	[LCDE_ByteOffset], eax
  2259 0000BC7D 31DB                <1> 	xor	ebx, ebx
  2260 0000BC7F 8A3D[56820100]      <1> 	mov	bh, [Current_Drv]
  2261 0000BC85 A0[7A890100]        <1>         mov     al, [DirBuff_DRV]
  2262 0000BC8A 2C41                <1> 	sub	al, 'A'
  2263 0000BC8C BE00010900          <1>         mov     esi, Logical_DOSDisks
  2264 0000BC91 01DE                <1> 	add	esi, ebx
  2265 0000BC93 38C7                <1> 	cmp	bh, al
  2266 0000BC95 0F8592000000        <1>         jne     loc_lcde_reload_current_directory
  2267                              <1> loc_lcde_cdl_check:
  2268 0000BC9B 803D[54820100]00    <1> 	cmp	byte [Current_Dir_Level], 0
  2269 0000BCA2 772A                <1> 	ja	short loc_lcde_calc_dirbuff_cluster_offset
  2270                              <1> 	; 27/02/2016
  2271                              <1> 	; TRDOS v1 has bug here for FAT32 fs !
  2272                              <1> 	; (Root Directory Entries for FAT32 = 0)
  2273 0000BCA4 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3  ; FAT32
  2274 0000BCA8 7324                <1> 	jnb	short loc_lcde_calc_dirbuff_cluster_offset
  2275                              <1> 
  2276                              <1> loc_lcde_cdl_check_FAT12_16:
  2277 0000BCAA 668B4617            <1> 	mov	ax, [esi+LD_BPB+RootDirEnts]
  2278 0000BCAE 6648                <1> 	dec	ax
  2279                              <1> 	;xor	dx, dx  
  2280 0000BCB0 6639C8              <1> 	cmp	ax, cx ; cx = Directory Entry (Index) Number
  2281 0000BCB3 720E                <1> 	jb	short loc_lcde_stc_12h_retn
  2282 0000BCB5 66890D[288C0100]    <1> 	mov	[LCDE_EntryIndex], cx
  2283 0000BCBC 31C0                <1> 	xor	eax, eax
  2284 0000BCBE E993000000          <1>         jmp     loc_lcde_check_dir_buffer_cluster
  2285                              <1> 
  2286                              <1> loc_lcde_stc_12h_retn:
  2287 0000BCC3 5E                  <1> 	pop	esi
  2288 0000BCC4 89CB                <1> 	mov	ebx, ecx
  2289 0000BCC6 89D1                <1> 	mov	ecx, edx
  2290                              <1> 	; 16/10/2016 (12h -> 12)
  2291 0000BCC8 B80C000000          <1> 	mov	eax, 12 ; No more files
  2292 0000BCCD C3                  <1> 	retn 
  2293                              <1> 
  2294                              <1> loc_lcde_calc_dirbuff_cluster_offset:
  2295 0000BCCE 8A5E13              <1> 	mov	bl, [esi+LD_BPB+SecPerClust]
  2296 0000BCD1 30FF                <1> 	xor	bh, bh
  2297 0000BCD3 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec]
  2298 0000BCD7 66F7E3              <1> 	mul	bx
  2299 0000BCDA 6609D2              <1>  	or	dx, dx ; If bytes per cluster > 32KB it is invalid
  2300 0000BCDD 755D                <1> 	jnz	short loc_lcde_invalid_format
  2301                              <1> 	;mov	ecx, eax
  2302 0000BCDF 6689C1              <1> 	mov	cx, ax ; BYTES PER CLUSTER
  2303 0000BCE2 A1[308C0100]        <1> 	mov	eax, [LCDE_ByteOffset]
  2304                              <1> 	;sub	edx, edx
  2305 0000BCE7 F7F1                <1> 	div	ecx
  2306 0000BCE9 3DFFFF0000          <1> 	cmp	eax, 65535
  2307 0000BCEE 774C                <1> 	ja	short loc_lcde_invalid_format
  2308                              <1> 
  2309                              <1> 	; cluster sequence number of directory (< 65536)
  2310 0000BCF0 66A3[2A8C0100]      <1> 	mov	[LCDE_ClusterSN], ax 
  2311                              <1> 
  2312 0000BCF6 6689D0              <1> 	mov	ax, dx ; byte offset in cluster (directory buffer)
  2313 0000BCF9 66BB2000            <1> 	mov	bx, 32 ; ; 1 dir entry = 32 bytes
  2314 0000BCFD 6629D2              <1>         sub     dx, dx  ; 0
  2315 0000BD00 66F7F3              <1> 	div	bx 
  2316 0000BD03 66A3[288C0100]      <1> 	mov	[LCDE_EntryIndex], ax ; dir entry index/sequence number
  2317                              <1> 				      ; (in directory buffer/cluster)	  
  2318                              <1> loc_lcde_get_current_sub_dir_fcluster:
  2319 0000BD09 A1[50820100]        <1> 	mov	eax, [Current_Dir_FCluster]
  2320                              <1> 
  2321                              <1> loc_lcde_get_next_cluster:
  2322 0000BD0E 66833D[2A8C0100]00  <1> 	cmp	word [LCDE_ClusterSN], 0
  2323 0000BD16 763E                <1> 	jna	short loc_lcde_check_dir_buffer_cluster
  2324 0000BD18 A3[2C8C0100]        <1> 	mov	[LCDE_Cluster], eax
  2325 0000BD1D E834100000          <1> 	call	get_next_cluster
  2326 0000BD22 7220                <1> 	jc	short loc_lcde_check_gnc_error
  2327 0000BD24 66FF0D[2A8C0100]    <1>   	dec	word [LCDE_ClusterSN]
  2328 0000BD2B EBE1                <1> 	jmp	short loc_lcde_get_next_cluster
  2329                              <1> 
  2330                              <1> loc_lcde_reload_current_directory:
  2331 0000BD2D 51                  <1> 	push	ecx
  2332 0000BD2E E814F6FFFF          <1> 	call	reload_current_directory
  2333 0000BD33 59                  <1> 	pop	ecx
  2334 0000BD34 0F8361FFFFFF        <1>         jnc     loc_lcde_cdl_check
  2335 0000BD3A 5E                  <1> 	pop	esi
  2336 0000BD3B C3                  <1> 	retn
  2337                              <1> 
  2338                              <1> loc_lcde_invalid_format:
  2339                              <1> 	; 15/10/2016 (0Bh -> 28)
  2340 0000BD3C B81C000000          <1> 	mov	eax, 28 ; Invalid Format !
  2341                              <1> loc_lcde_drive_not_ready_read_err:
  2342 0000BD41 F9                  <1> 	stc
  2343 0000BD42 5E                  <1> 	pop	esi 
  2344 0000BD43 C3                  <1> 	retn  
  2345                              <1> 
  2346                              <1> loc_lcde_check_gnc_error:
  2347 0000BD44 09C0                <1> 	or	eax, eax
  2348 0000BD46 75F9                <1> 	jnz	short loc_lcde_drive_not_ready_read_err
  2349 0000BD48 66FF0D[2A8C0100]    <1> 	dec	word [LCDE_ClusterSN]
  2350 0000BD4F 75EB                <1> 	jnz	short loc_lcde_invalid_format 
  2351 0000BD51 A1[2C8C0100]        <1> 	mov	eax, [LCDE_Cluster]
  2352                              <1> 
  2353                              <1> loc_lcde_check_dir_buffer_cluster:
  2354 0000BD56 3B05[81890100]      <1> 	cmp	eax, [DirBuff_Cluster]
  2355 0000BD5C 755C                <1> 	jne	short loc_lcde_load_dir_cluster
  2356 0000BD5E 803D[7C890100]00    <1> 	cmp	byte [DirBuff_ValidData], 0
  2357 0000BD65 7727                <1> 	ja	short lcde_check_dir_buffer_cluster_next
  2358 0000BD67 803D[54820100]00    <1> 	cmp	byte [Current_Dir_Level], 0    
  2359 0000BD6E 775F                <1> 	ja	short loc_lcde_load_dir_cluster_0
  2360                              <1> 	; 27/02/2016
  2361                              <1> 	; TRDOS v1 has bug here for FAT32 fs !
  2362 0000BD70 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3  ; FAT32
  2363 0000BD74 7359                <1> 	jnb	short loc_lcde_load_dir_cluster_0
  2364                              <1> 	;
  2365 0000BD76 0FB74E17            <1> 	movzx	ecx, word [esi+LD_BPB+RootDirEnts]
  2366 0000BD7A 6683C10F            <1> 	add	cx, 15 ; round up (16 entries per sector)
  2367 0000BD7E 66C1E904            <1> 	shr	cx, 4 ; 1 sector contains 16 dir entries	
  2368                              <1> 
  2369 0000BD82 8B4664              <1>         mov     eax, [esi+LD_ROOTBegin]
  2370 0000BD85 EB54                <1> 	jmp	short loc_lcde_load_dir_cluster_1 
  2371                              <1> 
  2372                              <1> loc_lcde_validate_dirBuff:
  2373 0000BD87 C605[7C890100]01    <1> 	mov	byte [DirBuff_ValidData], 1
  2374                              <1> 
  2375                              <1> lcde_check_dir_buffer_cluster_next:
  2376 0000BD8E 0FB71D[288C0100]    <1> 	movzx	ebx, word [LCDE_EntryIndex]
  2377 0000BD95 663B1D[7F890100]    <1> 	cmp	bx, [DirBuff_LastEntry]
  2378 0000BD9C 779E                <1> 	ja	short loc_lcde_invalid_format 
  2379 0000BD9E B820000000          <1> 	mov	eax, 32
  2380 0000BDA3 F7E3                <1> 	mul	ebx
  2381                              <1> 	;or	edx, edx
  2382                              <1> 	;jnz	short loc_lcde_invalid_format
  2383                              <1> 
  2384 0000BDA5 BF00000800          <1> 	mov	edi, Directory_Buffer  
  2385 0000BDAA 01C7                <1> 	add	edi, eax ; add entry offset to buffer address
  2386                              <1> 
  2387                              <1> loc_lcde_dir_buffer_last_check:
  2388 0000BDAC A1[81890100]        <1> 	mov	eax, [DirBuff_Cluster]
  2389 0000BDB1 0FB60D[7C890100]    <1> 	movzx	ecx, byte [DirBuff_ValidData]
  2390                              <1> 
  2391                              <1> loc_lcde_retn:
  2392 0000BDB8 5E                  <1> 	pop	esi
  2393 0000BDB9 C3                  <1> 	retn
  2394                              <1> 
  2395                              <1> loc_lcde_load_dir_cluster:
  2396                              <1> 	;cmp	byte [DirBuff_ValidData], 2
  2397                              <1> 	;jne	short loc_lcde_load_dir_cluster_n2
  2398 0000BDBA 50                  <1> 	push	eax
  2399 0000BDBB E8E6FCFFFF          <1> 	call	save_directory_buffer
  2400 0000BDC0 58                  <1> 	pop	eax
  2401 0000BDC1 72F5                <1> 	jc	short loc_lcde_retn
  2402                              <1> 
  2403                              <1> loc_lcde_load_dir_cluster_n2:
  2404 0000BDC3 C605[7C890100]00    <1> 	mov	byte [DirBuff_ValidData], 0
  2405 0000BDCA A3[81890100]        <1> 	mov	[DirBuff_Cluster], eax
  2406                              <1> 
  2407                              <1> loc_lcde_load_dir_cluster_0:
  2408 0000BDCF 83E802              <1> 	sub	eax, 2
  2409 0000BDD2 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  2410 0000BDD6 F7E1                <1> 	mul	ecx
  2411 0000BDD8 034668              <1>         add     eax, [esi+LD_DATABegin]
  2412                              <1> 
  2413                              <1> loc_lcde_load_dir_cluster_1:
  2414 0000BDDB BB00000800          <1> 	mov	ebx, Directory_Buffer
  2415                              <1> 	; ecx = sector count
  2416 0000BDE0 E838650000          <1> 	call	disk_read
  2417 0000BDE5 73A0                <1> 	jnc	short loc_lcde_validate_dirBuff
  2418                              <1> 
  2419                              <1> 	; 15/10/2016 
  2420                              <1> 	; (Disk read error instead of drv not ready err)
  2421 0000BDE7 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
  2422 0000BDEC EBCA                <1> 	jmp	short loc_lcde_retn
  2423                              <1> 
  2424                              <1> 
  2425                              <1> remove_file:
  2426                              <1> 	; 15/10/2016
  2427                              <1> 	; 28/02/2016 (TRDOS 386 = TRDOS v2.0)
  2428                              <1> 	; 10/04/2011 (FILE.ASM, 'proc_delete_file')
  2429                              <1> 	; 09/08/2010
  2430                              <1> 	; INPUT ->
  2431                              <1> 	;	EDI = Directory Buffer Entry Address
  2432                              <1> 	;	 CX = Directory Buffer Entry Counter/Index
  2433                              <1> 	;	 BL = Longname Entry Length
  2434                              <1> 	;	 BH = Logical DOS Drive Number 
  2435                              <1> 
  2436 0000BDEE 29C0                <1> 	sub	eax, eax
  2437 0000BDF0 88FC                <1> 	mov	ah, bh
  2438 0000BDF2 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2439 0000BDF7 01C6                <1> 	add	esi, eax
  2440                              <1> 
  2441 0000BDF9 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  2442 0000BDFD 7312                <1> 	jnb	short loc_del_fat_file 
  2443                              <1>               
  2444 0000BDFF 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  2445 0000BE03 7406                <1> 	je	short loc_del_fs_file
  2446                              <1> 
  2447                              <1> loc_del_file_invalid_format:
  2448 0000BE05 30E4                <1> 	xor	ah, ah
  2449                              <1> 	; 15/10/2016 (0Bh -> 28)
  2450 0000BE07 B01C                <1> 	mov	al, 28  ; Invalid Format
  2451 0000BE09 F9                  <1> 	stc 
  2452 0000BE0A C3                  <1> 	retn
  2453                              <1> 
  2454                              <1> loc_del_fs_file:
  2455 0000BE0B E83F0F0000          <1> 	call	delete_fs_file
  2456 0000BE10 C3                  <1> 	retn
  2457                              <1> 
  2458                              <1> loc_del_fat_file:
  2459 0000BE11 E808000000          <1> 	call	delete_directory_entry
  2460 0000BE16 7205                <1> 	jc	short loc_del_file_err_retn 
  2461                              <1> 
  2462                              <1> loc_delfile_unlink_cluster_chain:
  2463 0000BE18 E863170000          <1> 	call	truncate_cluster_chain
  2464                              <1> 	;jc	short loc_del_file_err_retn
  2465                              <1> 
  2466                              <1> loc_delfile_return:
  2467                              <1> loc_del_file_err_retn:
  2468 0000BE1D C3                  <1> 	retn
  2469                              <1> 
  2470                              <1> delete_directory_entry:
  2471                              <1> 	; 15/10/2016
  2472                              <1> 	; 28/02/2016 (TRDOS 386 = TRDOS v2.0)
  2473                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_delete_directory_entry')
  2474                              <1> 	; 10/04/2011 
  2475                              <1> 	; INPUT ->
  2476                              <1> 	; 	ESI = Logical Dos Drive Descripton Table Address 
  2477                              <1> 	;	EDI = Directory Buffer Entry Address
  2478                              <1> 	;	 CX = Directory Buffer Entry Counter/Index
  2479                              <1> 	;	 BL = Longname Entry Length
  2480                              <1> 	; OUTPUT ->
  2481                              <1> 	; 	ESI = Logical dos drive descripton table address 
  2482                              <1> 	;	EAX = First cluster to be truncated/unlinked
  2483                              <1> 	;       CF = 1 -> Error code in EAX (AL)
  2484                              <1> 	;       CF = 0 & BH <> 0 -> LMDT write error  (BH = 1)
  2485                              <1> 	;       CF = 0 & BL <> 0 -> Long name delete error (BL = FFh) 
  2486                              <1> 	;
  2487                              <1> 	;  (EDI, EBX, ECX register contents will be changed)
  2488                              <1> 
  2489 0000BE1E 881D[BE8B0100]      <1> 	mov	[DelFile_LNEL], bl
  2490 0000BE24 66890D[BC8B0100]    <1> 	mov	[DelFile_EntryCounter], cx
  2491                              <1> 
  2492 0000BE2B 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  2493 0000BE2F C1E010              <1> 	shl	eax, 16
  2494 0000BE32 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  2495                              <1> 
  2496 0000BE36 A3[B88B0100]        <1> 	mov	[DelFile_FCluster], eax
  2497                              <1> 
  2498                              <1> loc_del_short_name:
  2499 0000BE3B C607E5              <1> 	mov	byte [edi], 0E5h  ; Deleted sign
  2500                              <1> 
  2501 0000BE3E C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  2502 0000BE45 E85CFCFFFF          <1> 	call	save_directory_buffer
  2503 0000BE4A 723D                <1> 	jc	short loc_delete_direntry_err_return
  2504                              <1>  
  2505                              <1> loc_del_long_name:
  2506 0000BE4C 0FB615[BE8B0100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  2507 0000BE53 08D2                <1> 	or	dl, dl
  2508 0000BE55 7416                <1> 	jz	short loc_del_dir_entry_update_parent_dir_lm_date
  2509                              <1> 
  2510 0000BE57 8835[BE8B0100]      <1> 	mov	byte [DelFile_LNEL], dh ; 0              
  2511                              <1>   
  2512 0000BE5D 0FB705[BC8B0100]    <1> 	movzx	eax,  word [DelFile_EntryCounter]
  2513 0000BE64 29D0                <1> 	sub	eax, edx
  2514                              <1> 	;jnc	short loc_del_long_name_continue
  2515 0000BE66 7205                <1> 	jc	short loc_del_dir_entry_update_parent_dir_lm_date   
  2516                              <1> 
  2517                              <1> ;loc_del_direntry_inv_data_return: ; 15/10/2016 (0Dh -> 29)
  2518                              <1> ;	mov	eax, 29 ; 0Dh (TRDOS 8086) ; Invalid data
  2519                              <1> ;	retn
  2520                              <1> 
  2521                              <1> loc_del_long_name_continue: 
  2522                              <1> 	; AX = Directory Entry Number of the long name last entry
  2523 0000BE68 E897FDFFFF          <1> 	call	delete_longname
  2524                              <1> 	;jc	short loc_delete_direntry_err_return
  2525                              <1> 
  2526                              <1> loc_del_dir_entry_update_parent_dir_lm_date:
  2527 0000BE6D 801D[BE8B0100]00    <1> 	sbb	byte [DelFile_LNEL], 0 ; 0FFh if cf = 1
  2528                              <1> 
  2529 0000BE74 E8C8FCFFFF          <1> 	call	update_parent_dir_lmdt
  2530 0000BE79 B700                <1> 	mov	bh, 0
  2531 0000BE7B 80D700              <1> 	adc	bh, 0
  2532                              <1> 
  2533 0000BE7E 8A1D[BE8B0100]      <1> 	mov	bl, byte [DelFile_LNEL]
  2534                              <1>  
  2535                              <1> loc_delete_direntry_return:
  2536 0000BE84 A1[B88B0100]        <1> 	mov	eax, [DelFile_FCluster]
  2537                              <1> loc_delete_direntry_err_return:
  2538 0000BE89 C3                  <1> 	retn
  2539                              <1> 
  2540                              <1> rename_directory_entry:
  2541                              <1> 	; 13/11/2017
  2542                              <1> 	; 15/10/2016
  2543                              <1> 	; 06/03/2016 (TRDOS 386 = TRDOS v2.0)
  2544                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_rename_directory_entry')
  2545                              <1> 	; 19/11/2010
  2546                              <1> 	; INPUT -> (Current Directory)
  2547                              <1> 	;	CX = Directory Entry Number
  2548                              <1> 	;      EAX = First Cluster number of file or directory
  2549                              <1> 	;      EBX = Longname Length (dir entry count) (< 256)
  2550                              <1> 	;      ESI = New file (or directory) name (no path).
  2551                              <1> 	;           (ASCIIZ string)  
  2552                              <1> 	; OUTPUT -> 
  2553                              <1> 	;      CF = 0 -> successfull
  2554                              <1> 	;      CF = 1 -> error code in EAX (AL)
  2555                              <1> 	;
  2556                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI will be changed)
  2557                              <1> 
  2558 0000BE8A 803D[55820100]00    <1> 	cmp	byte [Current_FATType], 0
  2559 0000BE91 7706                <1> 	ja	short loc_rename_directory_entry
  2560                              <1> 
  2561 0000BE93 E8B80E0000          <1> 	call	rename_fs_file_or_directory
  2562 0000BE98 C3                  <1> 	retn 
  2563                              <1> 	
  2564                              <1> loc_rename_directory_entry:
  2565 0000BE99 881D[BE8B0100]      <1> 	mov	[DelFile_LNEL], bl
  2566 0000BE9F 66890D[BC8B0100]    <1> 	mov	[DelFile_EntryCounter], cx
  2567 0000BEA6 A3[B88B0100]        <1> 	mov	[DelFile_FCluster], eax
  2568                              <1> 
  2569 0000BEAB 0FB7C1              <1> 	movzx	eax, cx
  2570 0000BEAE E8BBFDFFFF          <1> 	call	locate_current_dir_entry
  2571 0000BEB3 7308                <1> 	jnc	short loc_rename_direntry_check_fcluster
  2572                              <1> 
  2573                              <1> loc_rename_direntry_pop_retn:
  2574 0000BEB5 C3                  <1> 	retn
  2575                              <1> 
  2576                              <1> loc_rename_direntry_pop_invd_retn:
  2577 0000BEB6 F9                  <1> 	stc
  2578                              <1> loc_rename_direntry_invd_retn:
  2579                              <1> 	; 15/10/2016 (0Dh -> 29)
  2580 0000BEB7 B81D000000          <1> 	mov	eax, 29 ; Invalid data
  2581                              <1> loc_rename_retn:
  2582 0000BEBC C3                  <1> 	retn 
  2583                              <1> 
  2584                              <1> loc_rename_direntry_check_fcluster:
  2585 0000BEBD 668B5714            <1> 	mov	dx, [edi+20] ; First Cluster HW
  2586 0000BEC1 C1E210              <1> 	shl	edx, 16 ; 13/11/2017
  2587 0000BEC4 668B571A            <1> 	mov	dx, [edi+26] ; First Cluster LW
  2588 0000BEC8 3B15[B88B0100]      <1> 	cmp	edx, [DelFile_FCluster]
  2589 0000BECE 75E6                <1> 	jne	short loc_rename_direntry_pop_invd_retn
  2590                              <1> 	; ESI = New file (or directory) name. (ASCIIZ string)
  2591                              <1> 	; 06/03/2016
  2592                              <1> 	; TRDOS v2 - NOTE: 'convert_file_name' procedure
  2593                              <1> 	; has been modified for eliminating following situation.
  2594                              <1> 	; 
  2595                              <1> 	; TRDOS v1 - NOTE: If file/dir name is more than 11 bytes
  2596                              <1> 	; without a dot, attributes (edi+11) byte will be overwritten !
  2597                              <1> 	; (Dot file name input must be proper for 11 byte dir entry
  2598                              <1> 	;  type file name output.) 
  2599 0000BED0 E8A2F6FFFF          <1> 	call	convert_file_name
  2600                              <1> 
  2601 0000BED5 C605[7C890100]02    <1>         mov     byte [DirBuff_ValidData], 2
  2602 0000BEDC E8C5FBFFFF          <1> 	call	save_directory_buffer
  2603 0000BEE1 72D9                <1> 	jc	short loc_rename_retn
  2604                              <1> 
  2605                              <1> loc_rename_direntry_del_ln:
  2606 0000BEE3 0FB615[BE8B0100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  2607 0000BEEA 08D2                <1> 	or	dl, dl
  2608 0000BEEC 7410                <1> 	jz	short loc_rename_direntry_update_parent_dir_lm_date
  2609                              <1> 
  2610 0000BEEE 0FB705[BC8B0100]    <1> 	movzx	eax, word [DelFile_EntryCounter]
  2611 0000BEF5 29D0                <1> 	sub	eax, edx
  2612 0000BEF7 72BE                <1> 	jc	short loc_rename_direntry_invd_retn
  2613                              <1> 
  2614                              <1> loc_rename_direntry_del_ln_continue: 
  2615                              <1> 	; EAX = Directory Entry Number of the long name last entry
  2616 0000BEF9 E806FDFFFF          <1> 	call	delete_longname
  2617                              <1> 
  2618                              <1> loc_rename_direntry_update_parent_dir_lm_date:
  2619 0000BEFE E83EFCFFFF          <1> 	call	update_parent_dir_lmdt
  2620 0000BF03 31C0                <1> 	xor	eax, eax 
  2621 0000BF05 C3                  <1> 	retn
  2622                              <1> 
  2623                              <1> move_source_file_to_destination_file:
  2624                              <1> 	; 15/10/2016
  2625                              <1> 	; 11/03/2016
  2626                              <1> 	; 10/03/2016 (TRDOS 386 = TRDOS v2.0)
  2627                              <1> 	; 01/08/2011 (FILE.ASM)
  2628                              <1> 	; 04/08/2010
  2629                              <1> 	;
  2630                              <1> 	;   Phase 1 -> Check destination file, 
  2631                              <1> 	;              'not found' is required
  2632                              <1> 	;   Phase 2 -> Check source file
  2633                              <1> 	;              'found' and proper attributes is required
  2634                              <1> 	;   Phase 3 -> Make destination directory entry,
  2635                              <1> 	;           add new dir cluster or section if it is required
  2636                              <1> 	;   Phase 4 -> Delete source directory entry.
  2637                              <1> 	;       cf = 1 causes to return before the phase 4.
  2638                              <1> 	;    (source file protection against any possible errors)    
  2639                              <1> 	;
  2640                              <1> 	; 08/05/2011 major modification
  2641                              <1> 	;            -> destination file deleting is removed   
  2642                              <1> 	;            for msdos move/rename compatibility.
  2643                              <1> 	;            (Access denied error will return if
  2644                              <1> 	;            the destination file is found...)
  2645                              <1> 	; INPUT ->
  2646                              <1> 	;	 ESI = Source File Pathname (Asciiz)
  2647                              <1> 	;        EDI = Destination File Pathname (Asciiz)
  2648                              <1> 	;        AL = 0 --> Interrupt (System call)
  2649                              <1> 	;        AL > 0 --> Command Interpreter (Question)
  2650                              <1> 	;        AL = 1 --> Question Phase
  2651                              <1> 	;        AL = 2 --> Progress Phase        
  2652                              <1> 	; OUTPUT -> 
  2653                              <1> 	;	 cf = 0 -> OK
  2654                              <1> 	;        EAX = Destination directory first cluster
  2655                              <1> 	;        ESI = Logical DOS drive description table 
  2656                              <1> 	;        EBX = Destination file structure offset
  2657                              <1> 	;        CX = 0 (CX > 0 --> calculate free space error)
  2658                              <1> 	;        cf = 1 -> Error code in EAX (AL) 
  2659                              <1> 	;
  2660                              <1> 	;  (EDX, ECX, EBX, ESI, EDI will be changed)
  2661                              <1> 
  2662 0000BF06 3C02                <1> 	cmp	al, 2
  2663 0000BF08 0F847F010000        <1> 	je	msftdf_df2_check_directory
  2664 0000BF0E A2[3E8D0100]        <1> 	mov	[move_cmd_phase], al
  2665                              <1> 
  2666                              <1> msftdf_parse_sf_path:
  2667                              <1> 	; ESI = ASCIIZ pathname (Source)
  2668 0000BF13 57                  <1> 	push	edi 
  2669 0000BF14 BF[3C8C0100]        <1> 	mov	edi, SourceFile_Drv
  2670 0000BF19 E824F7FFFF          <1> 	call	parse_path_name
  2671 0000BF1E 5E                  <1> 	pop	esi
  2672 0000BF1F 7211                <1> 	jc	short msftdf_psf_retn
  2673                              <1> 
  2674                              <1> msftdf_parse_df_path:
  2675                              <1> 	; ESI = ASCIIZ pathname	(Destination)
  2676 0000BF21 BF[BC8C0100]        <1> 	mov	edi, DestinationFile_Drv
  2677 0000BF26 E817F7FFFF          <1> 	call	parse_path_name
  2678 0000BF2B 7306                <1> 	jnc	short msftdf_check_sf_drv
  2679                              <1> 
  2680 0000BF2D 3C01                <1> 	cmp	al, 1 ; File or directory name is not existing
  2681 0000BF2F 7602                <1> 	jna	short msftdf_check_sf_drv
  2682                              <1> 
  2683                              <1> msftdf_stc_retn:
  2684 0000BF31 F9                  <1> 	stc
  2685                              <1> msftdf_psf_retn:
  2686 0000BF32 C3                  <1> 	retn 
  2687                              <1> 
  2688                              <1> msftdf_check_sf_drv:
  2689 0000BF33 A0[3C8C0100]        <1> 	mov	al, [SourceFile_Drv]
  2690                              <1> 
  2691                              <1> msftdf_check_df_drv:
  2692 0000BF38 8A15[BC8C0100]      <1> 	mov	dl, [DestinationFile_Drv]
  2693                              <1> 
  2694                              <1> msftdf_compare_sf_df_drv:
  2695 0000BF3E 29DB                <1> 	sub	ebx, ebx
  2696 0000BF40 8A3D[56820100]      <1> 	mov	bh, [Current_Drv]
  2697 0000BF46 38C2                <1> 	cmp	dl, al
  2698 0000BF48 7409                <1> 	je	short msftdf_check_sf_df_drv_ok
  2699                              <1> 
  2700                              <1> msftdf_not_same_drv:
  2701                              <1>         ; DL = source file's drive number
  2702 0000BF4A 88C6                <1> 	mov	dh, al ; destination file's drive number
  2703                              <1> 	; 15/10/2016 (11h -> 21)
  2704 0000BF4C B815000000          <1> 	mov	eax, 21 ; Not the same drive
  2705 0000BF51 F9                  <1> 	stc
  2706 0000BF52 C3                  <1> 	retn 
  2707                              <1> 
  2708                              <1> msftdf_check_sf_df_drv_ok:
  2709 0000BF53 8815[3F8D0100]      <1> 	mov	[msftdf_sf_df_drv], dl
  2710                              <1> 
  2711 0000BF59 29C0                <1>         sub	eax, eax
  2712 0000BF5B 88D4                <1> 	mov	ah, dl
  2713 0000BF5D 0500010900          <1> 	add	eax, Logical_DOSDisks
  2714 0000BF62 A3[408D0100]        <1> 	mov	[msftdf_drv_offset], eax
  2715                              <1> 
  2716 0000BF67 38FA                <1> 	cmp	dl, bh ; byte [Current_Drv]
  2717 0000BF69 7407                <1> 	je	short msftdf_df_check_directory
  2718                              <1> 
  2719                              <1> msftdf_change_drv:
  2720 0000BF6B E85EC1FFFF          <1> 	call 	change_current_drive
  2721 0000BF70 726D                <1> 	jc	short msftdf_df_error_retn
  2722                              <1> 	  
  2723                              <1> msftdf_check_destination_file:
  2724                              <1> msftdf_df_check_directory:
  2725 0000BF72 BE[BD8C0100]        <1> 	mov	esi, DestinationFile_Directory
  2726 0000BF77 803E20              <1> 	cmp	byte [esi], 20h
  2727 0000BF7A 760F                <1> 	jna	short msftdf_df_find_1
  2728                              <1> 
  2729                              <1> msftdf_df_change_directory:
  2730 0000BF7C FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  2731 0000BF82 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2732 0000BF84 E8A3F0FFFF          <1> 	call	change_current_directory
  2733 0000BF89 7254                <1> 	jc	short msftdf_df_error_retn
  2734                              <1> 
  2735                              <1> ;msftdf_df_change_prompt_dir_string:
  2736                              <1> ;	call 	change_prompt_dir_string
  2737                              <1> 
  2738                              <1> msftdf_df_find_1:
  2739 0000BF8B BE[FE8C0100]        <1>         mov     esi, DestinationFile_Name
  2740 0000BF90 803E20              <1> 	cmp	byte [esi], 20h
  2741 0000BF93 7631                <1> 	jna	short msftdf_df_copy_sf_name
  2742                              <1> 
  2743                              <1> msftdf_df_find_2:
  2744 0000BF95 6631C0              <1> 	xor	ax, ax ; DestinationFile_AttributesMask -> any/zero
  2745 0000BF98 E8D4D4FFFF          <1> 	call	find_first_file
  2746 0000BF9D 0F838D000000        <1> 	jnc	msftdf_permission_denied_retn
  2747                              <1> 
  2748                              <1> msftdf_df_check_error_code:
  2749                              <1> 	;cmp	eax, 2 ; File not found error
  2750 0000BFA3 3C02                <1> 	cmp	al, 2
  2751 0000BFA5 7537                <1> 	jne	short msftdf_df_stc_retn
  2752                              <1>               
  2753                              <1> msftdf_df_check_fname:
  2754                              <1> 	; 15/10/2016
  2755 0000BFA7 BE[FE8C0100]        <1> 	mov	esi, DestinationFile_Name ; *
  2756 0000BFAC E87ED8FFFF          <1> 	call	check_filename
  2757 0000BFB1 7307                <1> 	jnc	short msftdf_convert_df_direntry_name
  2758                              <1> 	; invalid file name chars !
  2759 0000BFB3 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME  ; 26
  2760 0000BFB8 EB24                <1> 	jmp	short msftdf_df_stc_retn
  2761                              <1> 
  2762                              <1> msftdf_convert_df_direntry_name:
  2763                              <1> 	; mov	esi, DestinationFile_Name ; *
  2764 0000BFBA BF[0E8D0100]        <1> 	mov	edi, DestinationFile_DirEntry
  2765 0000BFBF E8B3F5FFFF          <1> 	call	convert_file_name
  2766 0000BFC4 EB1A                <1>   	jmp	short msftdf_restore_current_dir_1
  2767                              <1> 
  2768                              <1> msftdf_df_copy_sf_name:
  2769 0000BFC6 89F7                <1> 	mov	edi, esi
  2770 0000BFC8 57                  <1> 	push	edi 
  2771 0000BFC9 BE[7E8C0100]        <1>         mov     esi, SourceFile_Name
  2772 0000BFCE B90C000000          <1> 	mov	ecx, 12
  2773                              <1> msftdf_df_copy_sf_name_loop:
  2774 0000BFD3 AC                  <1> 	lodsb
  2775 0000BFD4 AA                  <1>         stosb
  2776 0000BFD5 08C0                <1> 	or	al, al
  2777 0000BFD7 7402                <1> 	jz	short msftdf_df_copy_sf_name_ok	
  2778 0000BFD9 E2F8                <1>         loop    msftdf_df_copy_sf_name_loop
  2779                              <1> msftdf_df_copy_sf_name_ok:	
  2780 0000BFDB 5E                  <1> 	pop	esi  
  2781 0000BFDC EBB7                <1> 	jmp	short msftdf_df_find_2
  2782                              <1> 
  2783                              <1> msftdf_df_stc_retn:
  2784 0000BFDE F9                  <1> 	stc
  2785                              <1> msftdf_restore_cdir_failed:
  2786                              <1> msftdf_df_error_retn:
  2787 0000BFDF C3                  <1> 	retn
  2788                              <1> 
  2789                              <1> msftdf_restore_current_dir_1:
  2790 0000BFE0 803D[23380100]00    <1> 	cmp	byte [Restore_CDIR], 0
  2791 0000BFE7 760D                <1> 	jna	short msftdf_sf_check_directory
  2792 0000BFE9 8B35[408D0100]      <1> 	mov	esi, [msftdf_drv_offset] 
  2793 0000BFEF E891C1FFFF          <1> 	call	restore_current_directory
  2794 0000BFF4 72E9                <1> 	jc	short msftdf_restore_cdir_failed
  2795                              <1> 
  2796                              <1> msftdf_sf_check_directory:
  2797 0000BFF6 BE[3D8C0100]        <1> 	mov	esi, SourceFile_Directory
  2798 0000BFFB 803E20              <1> 	cmp	byte [esi], 20h
  2799 0000BFFE 760F                <1> 	jna	short msftdf_sf_find
  2800                              <1> msftdf_sf_change_directory:
  2801 0000C000 FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  2802 0000C006 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2803 0000C008 E81FF0FFFF          <1> 	call	change_current_directory
  2804 0000C00D 7227                <1> 	jc	short msftdf_return
  2805                              <1> 
  2806                              <1> ;msftdf_sf_change_prompt_dir_string:
  2807                              <1> ;	call	change_prompt_dir_string
  2808                              <1> 
  2809                              <1> msftdf_sf_find:
  2810 0000C00F BE[7E8C0100]        <1>         mov     esi, SourceFile_Name  ; Offset 66
  2811 0000C014 66B80018            <1> 	mov	ax, 1800h ; Only files
  2812 0000C018 E854D4FFFF          <1> 	call	find_first_file
  2813 0000C01D 7217                <1> 	jc	short msftdf_return
  2814                              <1> 
  2815                              <1> msftdf_sf_ambgfn_check:
  2816 0000C01F 6609D2              <1> 	or	dx, dx ; Ambiguous filename chars used sign (DX>0)
  2817 0000C022 7407                <1> 	jz	short msftdf_sf_found
  2818                              <1> 
  2819                              <1> msftdf_ambiguous_file_name_error:
  2820 0000C024 B802000000          <1> 	mov	eax, 2 ; File not found error
  2821 0000C029 F9                  <1> 	stc
  2822 0000C02A C3                  <1> 	retn
  2823                              <1> 
  2824                              <1> msftdf_sf_found:
  2825 0000C02B 80E31F              <1> 	and	bl, 1Fh ; Attributes, D-V-S-H-R
  2826 0000C02E 7416                <1> 	jz	short msftdf_save_sf_structure
  2827                              <1> 
  2828                              <1> msftdf_permission_denied_retn:
  2829 0000C030 B805000000          <1> 	mov	eax, 05h ; Access (Permission) denied !
  2830 0000C035 F9                  <1> 	stc
  2831                              <1> msftdf_rest_cdir_err_retn:
  2832                              <1> msftdf_return:
  2833 0000C036 C3                  <1> 	retn
  2834                              <1> 
  2835                              <1> msftdf_phase_1_return:
  2836 0000C037 31C0                <1> 	xor	eax, eax
  2837 0000C039 A2[3E8D0100]        <1> 	mov	[move_cmd_phase], al ; 0
  2838 0000C03E FEC0                <1> 	inc	al ; mov al, 1
  2839 0000C040 BB[8DC00000]        <1> 	mov	ebx, msftdf_df2_check_directory
  2840                              <1> 	;mov	edx, 0FFFFFFFFh 
  2841 0000C045 C3                  <1> 	retn
  2842                              <1> 
  2843                              <1> msftdf_save_sf_structure:
  2844 0000C046 BE[488B0100]        <1> 	mov	esi, FindFile_DirEntry
  2845 0000C04B BF[8E8C0100]        <1> 	mov	edi, SourceFile_DirEntry
  2846 0000C050 B908000000          <1> 	mov	ecx, 8
  2847 0000C055 F3A5                <1> 	rep	movsd
  2848                              <1> 
  2849                              <1> msftdf_df_copy_sf_parameters:
  2850 0000C057 BE0B000000          <1> 	mov	esi, 11
  2851 0000C05C 89F7                <1> 	mov	edi, esi
  2852 0000C05E 81C6[8E8C0100]      <1> 	add	esi, SourceFile_DirEntry
  2853 0000C064 81C7[0E8D0100]      <1> 	add	edi, DestinationFile_DirEntry
  2854                              <1> 	;mov	ecx, 21
  2855 0000C06A B115                <1> 	mov	cl, 21
  2856 0000C06C F3A4                <1> 	rep	movsb
  2857                              <1> 
  2858                              <1> msftdf_restore_current_dir_2:
  2859 0000C06E 803D[23380100]00    <1> 	cmp	byte [Restore_CDIR], 0
  2860 0000C075 760D                <1> 	jna	short msftdf_df2_check_move_cmd_phase
  2861 0000C077 8B35[408D0100]      <1>  	mov	esi, [msftdf_drv_offset]
  2862 0000C07D E803C1FFFF          <1> 	call	restore_current_directory
  2863 0000C082 72B2                <1> 	jc	short msftdf_rest_cdir_err_retn
  2864                              <1> 
  2865                              <1> msftdf_df2_check_move_cmd_phase:
  2866 0000C084 803D[3E8D0100]01    <1> 	cmp	byte [move_cmd_phase], 1
  2867 0000C08B 74AA                <1> 	je	short msftdf_phase_1_return
  2868                              <1> 
  2869                              <1> msftdf_df2_check_directory:
  2870 0000C08D BE[BD8C0100]        <1> 	mov	esi, DestinationFile_Directory
  2871 0000C092 803E20              <1> 	cmp	byte [esi], 20h
  2872 0000C095 760F                <1> 	jna	short msftdf_make_dfde_locate_ffe_on_directory
  2873                              <1> msftdf_df2_change_directory:
  2874 0000C097 FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  2875 0000C09D 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2876 0000C09F E888EFFFFF          <1> 	call	change_current_directory
  2877 0000C0A4 7290                <1> 	jc	short msftdf_return
  2878                              <1> 
  2879                              <1> ;msftdf_df2_change_prompt_dir_string:
  2880                              <1> ;	call	change_prompt_dir_string
  2881                              <1> 
  2882                              <1> msftdf_make_dfde_locate_ffe_on_directory:
  2883                              <1> 	; Current directory fcluster <> Directory buffer cluster
  2884                              <1> 	; Current directory will be reloaded by
  2885                              <1> 	; 'locate_current_dir_file' procedure
  2886                              <1> 	;
  2887                              <1> 	;xor	ax, ax
  2888 0000C0A6 31C0                <1> 	xor	eax, eax
  2889 0000C0A8 89C1                <1> 	mov	ecx, eax
  2890 0000C0AA 6649                <1> 	dec	cx ; FFFFh  
  2891                              <1> 		; CX = FFFFh -> find first deleted or free entry
  2892                              <1> 		; ESI would be ASCIIZ filename address if the call
  2893                              <1> 		; would not be for first free or deleted dir entry  
  2894 0000C0AC E8CFF1FFFF          <1> 	call	locate_current_dir_file
  2895 0000C0B1 733F                <1> 	jnc	msftdf_make_dfde_set_ff_dir_entry
  2896                              <1> 	
  2897                              <1> 	;cmp	eax, 2
  2898 0000C0B3 3C02                <1>         cmp	al, 2
  2899 0000C0B5 7537                <1> 	jne	short msftdf_error_retn
  2900                              <1> 
  2901                              <1> msftdf_add_new_dir_entry_check_fs:
  2902 0000C0B7 8B35[408D0100]      <1> 	mov	esi, [msftdf_drv_offset]
  2903 0000C0BD A1[81890100]        <1> 	mov 	eax, [DirBuff_Cluster]
  2904 0000C0C2 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2905 0000C0C6 7711                <1> 	ja	short msftdf_add_new_subdir_cluster
  2906                              <1> 
  2907                              <1> msftdf_add_new_fs_subdir_section:
  2908                              <1> 	;CL=0, CH=E5h --> deleted entry, CH=0 --> free entry
  2909                              <1>         ;xor	cx, cx
  2910 0000C0C8 30ED                <1> 	xor	ch, ch ; cx = 0 --> add a new subdir section
  2911 0000C0CA E8830C0000          <1> 	call	add_new_fs_section
  2912 0000C0CF 721E                <1>         jc	short msftdf_dsfde_error_retn
  2913                              <1> 	;mov	[createfile_LastDirCluster], eax
  2914                              <1> 
  2915 0000C0D1 E8A30E0000          <1> 	call	load_FS_sub_directory 
  2916                              <1> 	;mov	ebx, Directory_Buffer 
  2917 0000C0D6 7318                <1> 	jnc	short msftdf_add_new_fs_subdir_section_ok
  2918 0000C0D8 C3                  <1> 	retn	 
  2919                              <1> 
  2920                              <1> msftdf_add_new_subdir_cluster:
  2921 0000C0D9 E881150000          <1> 	call	add_new_cluster
  2922 0000C0DE 720F                <1> 	jc	short msftdf_dsfde_error_retn
  2923                              <1> 	
  2924                              <1> 	;mov	[createfile_LastDirCluster], eax
  2925                              <1> 
  2926 0000C0E0 E8570E0000          <1> 	call	load_FAT_sub_directory
  2927 0000C0E5 7309                <1> 	jnc	short msftdf_add_new_subdir_cluster_ok
  2928                              <1> 	; EBX = Directory buffer address
  2929                              <1> 
  2930                              <1> msftdf_ansdc_update_parent_dir_lmdt:
  2931                              <1> msftdf_make_dfde_err_upd_pdir_lmdt:
  2932 0000C0E7 50                  <1> 	push	eax
  2933 0000C0E8 E854FAFFFF          <1> 	call	update_parent_dir_lmdt
  2934 0000C0ED 58                  <1> 	pop	eax
  2935                              <1> 
  2936                              <1> msftdf_error_retn:
  2937 0000C0EE F9                  <1> 	stc
  2938                              <1> msftdf_dsfde_restore_cdir_failed:
  2939                              <1> msftdf_dsfde_error_retn:
  2940 0000C0EF C3                  <1> 	retn
  2941                              <1> 
  2942                              <1> msftdf_add_new_fs_subdir_section_ok:
  2943                              <1> msftdf_add_new_subdir_cluster_ok:
  2944 0000C0F0 89DF                <1> 	mov	edi, ebx ; Directory buffer address
  2945                              <1> 
  2946                              <1> msftdf_make_dfde_set_ff_dir_entry:
  2947 0000C0F2 8B15[50820100]      <1> 	mov	edx, [Current_Dir_FCluster]
  2948 0000C0F8 8915[A48D0100]      <1> 	mov	[createfile_FFCluster], edx
  2949                              <1> 	; EDI = Directory entry offset
  2950 0000C0FE BE[0E8D0100]        <1> 	mov	esi, DestinationFile_DirEntry
  2951 0000C103 B908000000          <1> 	mov	ecx, 8
  2952 0000C108 F3A5                <1> 	rep	movsd
  2953                              <1> 
  2954 0000C10A C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  2955 0000C111 E890F9FFFF          <1> 	call	save_directory_buffer
  2956 0000C116 72CF                <1> 	jc	short msftdf_make_dfde_err_upd_pdir_lmdt
  2957                              <1> 
  2958                              <1> msftdf_make_dfde_update_pdir_lmdt:
  2959 0000C118 E824FAFFFF          <1> 	call	update_parent_dir_lmdt
  2960                              <1> 
  2961                              <1> msftdf_dsfde_restore_current_dir_1:
  2962 0000C11D 803D[23380100]00    <1> 	cmp	byte [Restore_CDIR], 0
  2963 0000C124 760D                <1> 	jna	short msftdf_dsfde_check_directory
  2964 0000C126 8B35[408D0100]      <1>  	mov	esi, [msftdf_drv_offset]
  2965 0000C12C E854C0FFFF          <1> 	call	restore_current_directory
  2966 0000C131 72BC                <1> 	jc	short msftdf_dsfde_restore_cdir_failed
  2967                              <1> 
  2968                              <1> msftdf_dsfde_check_directory:
  2969 0000C133 BE[3D8C0100]        <1> 	mov	esi, SourceFile_Directory
  2970 0000C138 803E20              <1> 	cmp	byte [esi], 20h
  2971 0000C13B 760F                <1> 	jna	short msftdf_dsfde_find_file
  2972                              <1> 
  2973                              <1> msftdf_dsfde_change_directory:
  2974 0000C13D FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  2975 0000C143 28E4                <1> 	sub	ah, ah ; CD_COMMAND sign -> 0 
  2976 0000C145 E8E2EEFFFF          <1> 	call	change_current_directory
  2977 0000C14A 72A3                <1> 	jc	short msftdf_dsfde_error_retn
  2978                              <1> 
  2979                              <1> ;msftdf_dsfde_sf_change_prompt_dir_string:
  2980                              <1> ;	call	change_prompt_dir_string
  2981                              <1> 
  2982                              <1> msftdf_dsfde_find_file:
  2983 0000C14C BE[7E8C0100]        <1> 	mov	esi, SourceFile_Name  ; Offset 66
  2984 0000C151 668B460E            <1> 	mov	ax, [esi+14] ; 80 -> SourceFile_AttributesMask
  2985 0000C155 E817D3FFFF          <1> 	call	find_first_file
  2986 0000C15A 7293                <1> 	jc	short msftdf_dsfde_error_retn
  2987                              <1> 
  2988                              <1> msftdf_dsfde_delete_direntry:
  2989 0000C15C 8B35[408D0100]      <1> 	mov	esi, [msftdf_drv_offset]
  2990                              <1> 	
  2991 0000C162 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2992 0000C166 770A                <1> 	ja	short msftdf_delete_FAT_direntry
  2993                              <1> 	
  2994 0000C168 30DB                <1> 	xor	bl, bl
  2995                              <1> 	; BL = 0 -> File
  2996                              <1> 	; EDI -> Directory buffer entry offset/address 
  2997 0000C16A E8E40B0000          <1> 	call	delete_fs_directory_entry
  2998 0000C16F 7315                <1> 	jnc	short msftdf_dsfde_restore_current_dir_2
  2999 0000C171 C3                  <1> 	retn
  3000                              <1> 
  3001                              <1> msftdf_delete_FAT_direntry:	
  3002 0000C172 8A1D[458B0100]      <1> 	mov	bl, [FindFile_LongNameEntryLength]
  3003 0000C178 668B0D[708B0100]    <1> 	mov	cx, [FindFile_DirEntryNumber]
  3004                              <1> 	; ESI = Logical DOS drive description table address
  3005                              <1> 	; EDI = Directory buffer entry offset/address 
  3006 0000C17F E89AFCFFFF          <1> 	call	delete_directory_entry
  3007 0000C184 721C                <1> 	jc	short msftdf_retn
  3008                              <1> 
  3009                              <1> msftdf_dsfde_restore_current_dir_2:
  3010 0000C186 803D[23380100]00    <1> 	cmp	byte [Restore_CDIR], 0
  3011 0000C18D 7607                <1> 	jna	short msftdf_new_dir_fcluster_retn
  3012                              <1> 	;mov	esi, [msftdf_drv_offset]
  3013 0000C18F E8F1BFFFFF          <1> 	call	restore_current_directory
  3014 0000C194 720C                <1> 	jc	short msftdf_retn
  3015                              <1> 
  3016                              <1> msftdf_new_dir_fcluster_retn:
  3017 0000C196 31C9                <1> 	xor	ecx, ecx 
  3018 0000C198 A1[A48D0100]        <1> 	mov	eax, [createfile_FFCluster]
  3019 0000C19D BB[BC8C0100]        <1> 	mov	ebx, DestinationFile_Drv
  3020                              <1> 
  3021                              <1> msftdf_retn:
  3022 0000C1A2 C3                  <1> 	retn
  3023                              <1> 
  3024                              <1> 
  3025                              <1> copy_source_file_to_destination_file:
  3026                              <1> 	; 17/10/2016
  3027                              <1> 	; 16/10/2016
  3028                              <1> 	; 15/10/2016
  3029                              <1> 	; 30/03/2016, 31/03/2016
  3030                              <1> 	; 24/03/2016, 25/03/2016, 28/03/2016
  3031                              <1> 	; 21/03/2016, 22/03/2016, 23/03/2016
  3032                              <1> 	; 16/03/2016, 17/03/2016, 18/03/2016
  3033                              <1> 	; 15/03/2016 (TRDOS 386 = TRDOS v2.0)
  3034                              <1> 	; 02/09/2011 (FILE.ASM 'copy_source_file_to_destination_file')
  3035                              <1> 	; 01/08/2010 - 18/05/2011
  3036                              <1> 	;
  3037                              <1> 	;   Command Interpreter phase 1 enter ->
  3038                              <1> 	;           AL = 1 -> Caller is command interpreter
  3039                              <1> 	;           AL = 2 -> The second call, re-enter/continue
  3040                              <1> 	;   Phase 1 -> Check source file
  3041                              <1> 	;              'found' is required
  3042                              <1> 	;   Phase 2 -> Check destination file, 
  3043                              <1> 	;              save 'found' or 'not found' status
  3044                              <1> 	;              'permission denied' error will be return
  3045                              <1> 	;              if attributes have not for ordinary file 
  3046                              <1> 	;              without readonly attribute
  3047                              <1> 	;   Command Interpreter phase 1 return ->
  3048                              <1> 	;              DH = Source file attributes
  3049                              <1> 	;              DL = Destination file found status
  3050                              <1> 	;              EAX = 0 
  3051                              <1> 	;   Command Interpreter phase 2 enter ->
  3052                              <1> 	;              AL = 2 -> Continue from the last position
  3053                              <1> 	;              AH = 
  3054                              <1> 	;   Phase 3 -> Load source file or use read/write cluster method
  3055                              <1> 	;   Phase 4 -> Create destination file if it is not found
  3056                              <1> 	;   Phase 5 -> Open destination file
  3057                              <1> 	;   Phase 6 -> Read from source and write to destination
  3058                              <1> 	;   Phase 7 -> Unload source file, if it is loaded at memory
  3059                              <1> 	;       cf = 1 causes to return before the phase 7
  3060                              <1> 	;              but loaded file will be unloaded
  3061                              <1> 	;	       (allocated memory block will be deallocated) 
  3062                              <1> 	;
  3063                              <1> 	; INPUT -> 
  3064                              <1> 	;	 ESI = Source File Pathname (Asciiz)
  3065                              <1> 	;        EDI = Destination File Pathname (Asciiz)
  3066                              <1> 	;        AL = 0 --> Interrupt (System call)
  3067                              <1> 	;        AL > 0 --> Command Interpreter (Question)
  3068                              <1> 	;        AL = 1 --> Question Phase
  3069                              <1> 	;        AL = 2 --> Progress Phase        
  3070                              <1> 	;
  3071                              <1> 	; OUTPUT -> 
  3072                              <1> 	;	cf = 0 -> OK
  3073                              <1> 	;	EAX = Destination file first cluster
  3074                              <1> 	;
  3075                              <1> 	;        CL > 0 if there is file reading error before EOF
  3076                              <1> 	;	        (incomplete copy) 
  3077                              <1> 	;        CH > 0 if file is (full) loaded at memory
  3078                              <1> 	;
  3079                              <1> 	;	cf = 1 -> Error code in AL (EAX) 
  3080                              <1> 	;
  3081                              <1> 	; (EBX, ECX, ESI, EDI register contents will be changed)           
  3082                              <1> 
  3083                              <1> 
  3084 0000C1A3 3C02                <1> 	cmp	al, 2
  3085 0000C1A5 0F845A020000        <1> 	je	csftdf2_check_cdrv
  3086                              <1> 
  3087                              <1> ; Phase 1
  3088                              <1> 
  3089 0000C1AB A2[648D0100]        <1> 	mov	byte [copy_cmd_phase], al
  3090                              <1> 
  3091 0000C1B0 57                  <1> 	push	edi ; *
  3092                              <1> 
  3093                              <1> csftdf_parse_sf_path:
  3094 0000C1B1 BF[3C8C0100]        <1> 	mov	edi, SourceFile_Drv
  3095 0000C1B6 E887F4FFFF          <1> 	call	parse_path_name
  3096 0000C1BB 721C                <1> 	jc	short csftdf_parse_sf_path_failed
  3097                              <1> 
  3098                              <1> csftdf_parse_df_path:	
  3099 0000C1BD 5E                  <1> 	pop	esi ; * (pushed edi) 
  3100                              <1> 
  3101                              <1> csftdf_sf_check_filename_exists:
  3102 0000C1BE 803D[7E8C0100]21    <1> 	cmp	byte [SourceFile_Name], 21h
  3103 0000C1C5 7215                <1> 	jb	short csftdf_sf_file_not_found_error
  3104                              <1> 
  3105 0000C1C7 BF[BC8C0100]        <1> 	mov	edi, DestinationFile_Drv
  3106 0000C1CC E871F4FFFF          <1> 	call	parse_path_name
  3107 0000C1D1 7310                <1> 	jnc	short csftdf_check_sf_cdrv
  3108                              <1> 	
  3109 0000C1D3 3C01                <1> 	cmp	al, 1 ; File or directory name is not existing
  3110 0000C1D5 760C                <1> 	jna	short csftdf_check_sf_cdrv
  3111                              <1> 
  3112                              <1> csftdf_parse_df_path_failed:
  3113 0000C1D7 F9                  <1> 	stc 
  3114                              <1> csftdf_sf_error_retn: 
  3115 0000C1D8 C3                  <1> 	retn
  3116                              <1> 
  3117                              <1> csftdf_parse_sf_path_failed:	
  3118 0000C1D9 5F                  <1> 	pop	edi ; *
  3119 0000C1DA EBFC                <1> 	jmp	short csftdf_sf_error_retn
  3120                              <1> 
  3121                              <1> csftdf_sf_file_not_found_error:
  3122 0000C1DC B802000000          <1> 	mov	eax, 2 ; File not found 
  3123 0000C1E1 EBF5                <1> 	jmp	short csftdf_sf_error_retn
  3124                              <1> 
  3125                              <1> csftdf_check_sf_cdrv:
  3126 0000C1E3 8A3D[56820100]      <1> 	mov	bh, [Current_Drv]
  3127                              <1> 
  3128 0000C1E9 883D[678D0100]      <1> 	mov	[csftdf_cdrv], bh ; 23/03/2016
  3129                              <1> 
  3130 0000C1EF 8A15[3C8C0100]      <1> 	mov	dl, [SourceFile_Drv]
  3131 0000C1F5 38FA                <1> 	cmp	dl, bh ; byte [Current_Drv]
  3132 0000C1F7 7407                <1> 	je	short csftdf_sf_check_directory
  3133                              <1> 
  3134 0000C1F9 E8D0BEFFFF          <1> 	call	change_current_drive
  3135 0000C1FE 72D8                <1> 	jc	short csftdf_sf_error_retn
  3136                              <1> 
  3137                              <1> csftdf_sf_check_directory:
  3138 0000C200 BE[3D8C0100]        <1> 	mov	esi, SourceFile_Directory
  3139 0000C205 803E20              <1> 	cmp	byte [esi], 20h
  3140 0000C208 760F                <1> 	jna	short csftdf_find_sf
  3141                              <1> 
  3142                              <1> csftdf_sf_change_directory:
  3143 0000C20A FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  3144 0000C210 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3145 0000C212 E815EEFFFF          <1> 	call	change_current_directory
  3146 0000C217 72BF                <1> 	jc	short csftdf_sf_error_retn
  3147                              <1> 
  3148                              <1> ;csftdf_sf_change_prompt_dir_string:
  3149                              <1> ;	call	change_prompt_dir_string
  3150                              <1> 
  3151                              <1> csftdf_find_sf:
  3152 0000C219 BE[7E8C0100]        <1> 	mov	esi, SourceFile_Name
  3153 0000C21E 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  3154 0000C222 E84AD2FFFF          <1> 	call	find_first_file
  3155 0000C227 72AF                <1> 	jc	short csftdf_sf_error_retn
  3156                              <1> 
  3157                              <1> csftdf_sf_ambgfn_check:
  3158 0000C229 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3159 0000C22C 7407                <1> 	jz	short csftdf_sf_found
  3160                              <1> 
  3161                              <1> csftdf_ambiguous_file_name_error:
  3162 0000C22E B802000000          <1> 	mov	eax, 2 ; File not found error
  3163 0000C233 F9                  <1> 	stc
  3164 0000C234 C3                  <1> 	retn
  3165                              <1> 
  3166                              <1> csftdf_sf_found:
  3167 0000C235 A3[688D0100]        <1> 	mov	[csftdf_filesize], eax
  3168                              <1> 
  3169 0000C23A 09C0                <1> 	or	eax, eax
  3170 0000C23C 7507                <1> 	jnz	short csftdf_set_source_file_direntry
  3171                              <1> 
  3172                              <1> csftdf_sf_file_size_zero:
  3173 0000C23E B814000000          <1> 	mov	eax, 20 ; TRDOS zero length (file size) error
  3174 0000C243 F9                  <1> 	stc
  3175 0000C244 C3                  <1> 	retn
  3176                              <1> 
  3177                              <1> csftdf_set_source_file_direntry:
  3178 0000C245 BE[488B0100]        <1> 	mov	esi, FindFile_DirEntry
  3179 0000C24A BF[8E8C0100]        <1> 	mov	edi, SourceFile_DirEntry
  3180 0000C24F B908000000          <1> 	mov	ecx, 8
  3181 0000C254 F3A5                <1> 	rep	movsd
  3182                              <1> 
  3183                              <1> csftdf_sf_restore_cdrv:
  3184                              <1> 	; 22/03/2016
  3185 0000C256 8A15[678D0100]      <1> 	mov	dl, [csftdf_cdrv]
  3186 0000C25C 3A15[56820100]      <1> 	cmp	dl, [Current_Drv]
  3187 0000C262 7407                <1> 	je	short csftdf_sf_restore_cdir
  3188 0000C264 E865BEFFFF          <1> 	call	change_current_drive 
  3189 0000C269 724F                <1> 	jc	short csftdf_df_error_retn ; 30/03/2016
  3190                              <1> 
  3191                              <1> csftdf_sf_restore_cdir:
  3192 0000C26B 803D[23380100]00    <1> 	cmp	byte [Restore_CDIR], 0
  3193 0000C272 7612                <1> 	jna	short csftdf_df_check_filename_exists
  3194 0000C274 29C0                <1> 	sub	eax, eax
  3195 0000C276 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3196 0000C27B 88D4                <1> 	mov	ah, dl ; byte [csftdf_cdrv]
  3197 0000C27D 01C6                <1> 	add	esi, eax
  3198 0000C27F E801BFFFFF          <1> 	call	restore_current_directory
  3199 0000C284 7234                <1> 	jc	short csftdf_df_error_retn
  3200                              <1>   
  3201                              <1> csftdf_df_check_filename_exists:
  3202 0000C286 803D[FE8C0100]20    <1> 	cmp	byte [DestinationFile_Name], 20h
  3203 0000C28D 7716                <1> 	ja	short csftdf_check_df_cdrv
  3204                              <1> 
  3205                              <1> csftdf_copy_sf_name:
  3206 0000C28F BF[FE8C0100]        <1> 	mov	edi, DestinationFile_Name
  3207 0000C294 BE[7E8C0100]        <1> 	mov	esi, SourceFile_Name
  3208 0000C299 B10C                <1> 	mov	cl, 12
  3209                              <1> 
  3210                              <1> csftdf_df_copy_sf_name_loop:
  3211 0000C29B AC                  <1> 	lodsb
  3212 0000C29C AA                  <1> 	stosb
  3213 0000C29D 08C0                <1> 	or	al, al
  3214 0000C29F 7404                <1> 	jz	short csftdf_check_df_cdrv             
  3215 0000C2A1 FEC9                <1> 	dec	cl
  3216 0000C2A3 75F6                <1> 	jnz	csftdf_df_copy_sf_name_loop
  3217                              <1> 
  3218                              <1> csftdf_check_df_cdrv:
  3219 0000C2A5 8A15[BC8C0100]      <1> 	mov	dl, [DestinationFile_Drv]
  3220 0000C2AB 3A15[56820100]      <1> 	cmp	dl, [Current_Drv]
  3221 0000C2B1 7408                <1> 	je	short csftdf_df_check_directory
  3222                              <1> 
  3223 0000C2B3 E816BEFFFF          <1> 	call	change_current_drive
  3224 0000C2B8 7301                <1> 	jnc	short csftdf_df_check_directory
  3225                              <1> 
  3226                              <1> csftdf_df_error_retn:
  3227 0000C2BA C3                  <1> 	retn
  3228                              <1> 
  3229                              <1> csftdf_df_check_directory:
  3230 0000C2BB BE[BD8C0100]        <1> 	mov	esi, DestinationFile_Directory
  3231 0000C2C0 803E20              <1>         cmp     byte [esi], 20h
  3232 0000C2C3 760F                <1> 	jna	short csftdf_find_df
  3233                              <1> 
  3234                              <1> csftdf_df_change_directory:
  3235 0000C2C5 FE05[23380100]      <1> 	inc	byte [Restore_CDIR]
  3236 0000C2CB 28E4                <1> 	sub	ah, ah ; CD_COMMAND sign -> 0 
  3237 0000C2CD E85AEDFFFF          <1> 	call	change_current_directory
  3238 0000C2D2 72E6                <1> 	jc	short csftdf_df_error_retn
  3239                              <1> 
  3240                              <1> ;csftdf_df_change_prompt_dir_string:
  3241                              <1> ;	call	change_prompt_dir_string
  3242                              <1> 
  3243                              <1> csftdf_find_df:
  3244                              <1> 	; 23/03/2016
  3245 0000C2D4 29DB                <1> 	sub	ebx, ebx
  3246 0000C2D6 8A3D[BC8C0100]      <1> 	mov	bh,  [DestinationFile_Drv]
  3247 0000C2DC 81C300010900        <1> 	add	ebx, Logical_DOSDisks
  3248 0000C2E2 891D[948D0100]      <1> 	mov	[csftdf_df_drv_dt], ebx
  3249                              <1> 
  3250 0000C2E8 BE[FE8C0100]        <1> 	mov	esi, DestinationFile_Name
  3251 0000C2ED 6631C0              <1> 	xor	ax, ax 
  3252                              <1> 		; DestinationFile_AttributesMask -> any/zero
  3253 0000C2F0 E87CD1FFFF          <1> 	call	find_first_file
  3254 0000C2F5 7218                <1> 	jc	short csftdf_df_check_error_code
  3255                              <1> 
  3256                              <1> csftdf_df_ambgfn_check:
  3257 0000C2F7 6609D2              <1> 	or	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3258 0000C2FA 752A                <1> 	jnz	short csftdf_df_error_inv_fname
  3259                              <1> 	
  3260                              <1> csftdf_df_found:
  3261 0000C2FC C605[668D0100]01    <1> 	mov	byte [DestinationFileFound], 1
  3262                              <1> 	; 17/10/2016 (cl -> bl)
  3263 0000C303 80E31F              <1> 	and	bl, 1Fh ; Attributes, D-V-S-H-R
  3264 0000C306 745F                <1> 	jz	short csftdf_df_save_first_cluster
  3265                              <1> 
  3266                              <1> csftdf_df_permission_denied_retn:	 
  3267 0000C308 B805000000          <1> 	mov	eax, 05h ; Access/Permission denied.
  3268                              <1> csftdf_df_error_stc_retn:
  3269 0000C30D F9                  <1> 	stc
  3270 0000C30E C3                  <1> 	retn
  3271                              <1> 
  3272                              <1> csftdf_df_check_error_code:
  3273                              <1> 	;cmp	eax, 2
  3274 0000C30F 3C02                <1> 	cmp	al, 2
  3275 0000C311 75FA                <1> 	jne	short csftdf_df_error_stc_retn
  3276                              <1> 
  3277 0000C313 C605[668D0100]00    <1> 	mov	byte [DestinationFileFound], 0
  3278                              <1> 
  3279                              <1> 	; 15/10/2016
  3280 0000C31A BE[388B0100]        <1> 	mov	esi, FindFile_Name ; *
  3281 0000C31F E80BD5FFFF          <1> 	call	check_filename
  3282 0000C324 7307                <1> 	jnc	short csftdf_df_valid_fname
  3283                              <1> csftdf_df_error_inv_fname: ; 'invalid file name !'
  3284 0000C326 B81A000000          <1> 	mov 	eax, ERR_INV_FILE_NAME  ; 26
  3285 0000C32B F9                  <1> 	stc	
  3286 0000C32C C3                  <1> 	retn
  3287                              <1> 
  3288                              <1> csftdf_df_valid_fname:	
  3289                              <1> 	; 21/03/2016
  3290                              <1> 	; (Capitalized file name)
  3291                              <1> 	;mov	esi, FindFile_Name ; * ; 15/10/2016
  3292 0000C32D BF[FE8C0100]        <1> 	mov	edi, DestinationFile_Name
  3293 0000C332 A5                  <1> 	movsd
  3294 0000C333 A5                  <1> 	movsd	
  3295 0000C334 A5                  <1> 	movsd
  3296                              <1> 	;movsb
  3297                              <1> 
  3298                              <1> csftdf_check_disk_free_size_0:
  3299 0000C335 A1[AA8C0100]        <1> 	mov	eax, [SourceFile_DirEntry+DirEntry_FileSize]
  3300                              <1> 
  3301                              <1> csftdf_check_disk_free_size_1:
  3302                              <1> 	;sub	ebx, ebx
  3303                              <1> 	;mov 	esi, Logical_DOSDisks
  3304                              <1> 	;mov	bh,  [DestinationFile_Drv]
  3305                              <1> 	;add	esi, ebx
  3306                              <1> 	
  3307 0000C33A 8B35[948D0100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 23/03/2016
  3308                              <1> 
  3309 0000C340 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec] ; 17, LD_BPB + 0Bh
  3310 0000C344 01C8                <1> 	add	eax, ecx
  3311 0000C346 48                  <1> 	dec	eax  ; file size (additional bytes) + 511 (round up)
  3312                              <1> csftdf_check_disk_free_size_3: ; 16/03/2016
  3313 0000C347 29D2                <1> 	sub	edx, edx
  3314 0000C349 F7F1                <1> 	div	ecx ; bytes per sector
  3315                              <1> 
  3316                              <1> csftdf_check_disk_free_size:
  3317 0000C34B 3B4674              <1> 	cmp	eax, [esi+LD_FreeSectors]
  3318 0000C34E 0F8294000000        <1>         jb      csftdf_check_disk_free_size_ok
  3319 0000C354 770A                <1> 	ja	short csftdf_df_insufficient_disk_space
  3320                              <1> 
  3321 0000C356 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0 ; FS needs FDT sector also.
  3322 0000C35A 0F8788000000        <1>         ja      csftdf_check_disk_free_size_ok 
  3323                              <1> 
  3324                              <1> csftdf_df_insufficient_disk_space:
  3325 0000C360 B827000000          <1> 	mov	eax, 27h ; insufficient disk space
  3326 0000C365 EBA6                <1> 	jmp	short csftdf_df_error_stc_retn
  3327                              <1> 
  3328                              <1> csftdf_df_save_first_cluster:
  3329                              <1> 	; ESI = FindFile_DirEntry (for the old destination file)
  3330                              <1> 	; EAX = Old destination file size
  3331                              <1> 	; 24/03/2016
  3332                              <1> 	; EDI = Directory entry address (within Dir Buffer boundaries)
  3333 0000C367 81EF00000800        <1> 	sub	edi, Directory_Buffer  ; (<65536)
  3334 0000C36D 66C1EF05            <1> 	shr	di, 5 ; Convert entry offset to entry index/number
  3335 0000C371 66893D[368D0100]    <1> 	mov	[DestinationFile_DirEntryNumber], di ; (<2048)
  3336                              <1> 
  3337                              <1> csftdf_df_check_sf_df_fcluster:
  3338 0000C378 668B5614            <1> 	mov	dx, [esi+DirEntry_FstClusHI]
  3339 0000C37C C1E210              <1> 	shl	edx, 16
  3340 0000C37F 668B561A            <1> 	mov	dx, [esi+DirEntry_FstClusLO]
  3341 0000C383 8915[788D0100]      <1> 	mov	[csftdf_df_cluster], edx
  3342                              <1> csftdf_df_check_sf_df_fcluster_1:
  3343 0000C389 668B15[A28C0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusHI]
  3344 0000C390 C1E210              <1> 	shl	edx, 16
  3345 0000C393 668B15[A88C0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusLO]
  3346 0000C39A 3B15[788D0100]      <1> 	cmp	edx, [csftdf_df_cluster]
  3347 0000C3A0 7512                <1> 	jne	short csftdf_df_check_sf_df_fcluster_ok
  3348                              <1> csftdf_df_check_sf_df_drv:
  3349 0000C3A2 8A15[3C8C0100]      <1> 	mov	dl, [SourceFile_Drv]
  3350 0000C3A8 3A15[BC8C0100]      <1> 	cmp	dl, [DestinationFile_Drv]
  3351 0000C3AE 7504                <1> 	jne	short csftdf_df_check_sf_df_fcluster_ok
  3352                              <1> 
  3353                              <1> 	; source and destination files are same !
  3354                              <1> 	; (they have same first cluster value on same logical disk)
  3355                              <1> 
  3356 0000C3B0 31C0                <1> 	xor	eax, eax ; mov eax, 0 -> Bad command or file name !
  3357 0000C3B2 F9                  <1> 	stc
  3358 0000C3B3 C3                  <1> 	retn 
  3359                              <1>    
  3360                              <1> csftdf_df_check_sf_df_fcluster_ok:
  3361                              <1> csftdf_df_move_findfile_struct:
  3362                              <1> 	; mov	esi, FindFile_DirEntry
  3363 0000C3B4 BF[0E8D0100]        <1> 	mov	edi, DestinationFile_DirEntry
  3364 0000C3B9 B908000000          <1> 	mov	ecx, 8
  3365 0000C3BE F3A5                <1> 	rep	movsd
  3366                              <1> 	
  3367                              <1> csftdf_check_disk_free_size_2:
  3368 0000C3C0 89C2                <1> 	mov	edx, eax ; Old destination file size
  3369                              <1> 
  3370                              <1> 	;mov	eax, [SourceFile_DirEntry+DirEntry_FileSize]
  3371 0000C3C2 A1[688D0100]        <1> 	mov	eax, [csftdf_filesize] ; 23/03/2016
  3372                              <1> 
  3373                              <1> 	;;sub	ecx, ecx ; 0
  3374                              <1> 	;mov 	esi, Logical_DOSDisks
  3375                              <1> 	;mov	ch,  [DestinationFile_Drv]
  3376                              <1> 	;add	esi, ecx
  3377                              <1> 	;
  3378                              <1> 	;mov	[csftdf_df_drv_dt], esi
  3379                              <1> 
  3380 0000C3C7 8B35[948D0100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 23/03/2016
  3381                              <1> 
  3382 0000C3CD 668B4E11            <1> 	mov	cx, [esi+LD_BPB+BytesPerSec] ; 17, LD_BPB + 0Bh
  3383 0000C3D1 01CA                <1> 	add	edx, ecx ; + 512
  3384 0000C3D3 01C8                <1> 	add	eax, ecx ; + 512
  3385 0000C3D5 4A                  <1> 	dec	edx ; old file size + 511 (round up)
  3386 0000C3D6 48                  <1> 	dec	eax ; new file size + 511 (round up)
  3387 0000C3D7 F7D9                <1> 	neg	ecx ; -512 ; 0FFFFFE00h
  3388 0000C3D9 21CA                <1> 	and	edx, ecx ; = old sector count * 512 
  3389 0000C3DB 21C8                <1> 	and	eax, ecx ; = new sector count * 512 
  3390                              <1> 
  3391 0000C3DD 29D0                <1> 	sub	eax, edx ; new file size - old file size (on disk)
  3392 0000C3DF 7607                <1> 	jna	short csftdf_check_disk_free_size_ok
  3393                              <1> 
  3394 0000C3E1 F7D9                <1> 	neg	ecx ; 512 (bytes per sector) ; 200h
  3395                              <1> 	; check free space for additional sectors
  3396                              <1> 	; eax = number of additional sectors * bytes per sector
  3397                              <1> 	; esi = Logical DOS drive number (of destination disk)
  3398 0000C3E3 E95FFFFFFF          <1>         jmp     csftdf_check_disk_free_size_3
  3399                              <1>  
  3400                              <1> csftdf_check_disk_free_size_ok:
  3401                              <1> 	; 18/03/2016
  3402                              <1> csftdf_df_check_copy_cmd_phase:
  3403 0000C3E8 A0[648D0100]        <1> 	mov	al, [copy_cmd_phase]
  3404 0000C3ED 3C01                <1> 	cmp	al, 1
  3405 0000C3EF 7514                <1> 	jne	short csftdf2_check_cdrv
  3406                              <1> 	
  3407 0000C3F1 31C0                <1> 	xor	eax, eax
  3408 0000C3F3 A2[648D0100]        <1> 	mov	[copy_cmd_phase], al ; 0
  3409                              <1> 
  3410 0000C3F8 8A15[668D0100]      <1> 	mov	dl, [DestinationFileFound]            
  3411 0000C3FE 8A35[998C0100]      <1> 	mov	dh, [SourceFile_DirEntry+11] ; Attributes
  3412                              <1>  
  3413                              <1> csftdf_return:	
  3414 0000C404 C3                  <1> 	retn
  3415                              <1> 
  3416                              <1> ; Phase 2
  3417                              <1> 
  3418                              <1> csftdf2_check_cdrv:
  3419                              <1> 	; 18/03/2016
  3420                              <1> 	; Here, destination drive and directory are ready !
  3421                              <1> 	; (checking/restoring is not needed)
  3422                              <1> 	; (Since at the end of the phase 1)
  3423                              <1> 
  3424                              <1> ;	mov	dl, [DestinationFile_Drv]
  3425                              <1> ;	cmp	dl, [Current_Drv]
  3426                              <1> ;	je	short csftdf2_df_check_directory
  3427                              <1> ;
  3428                              <1> ;	call	change_current_drive
  3429                              <1> ;	jc	short csftdf2_read_error
  3430                              <1> ;
  3431                              <1> ;csftdf2_df_check_directory:
  3432                              <1> ;	mov	esi, DestinationFile_Directory  
  3433                              <1> ;	cmp	byte [esi], 20h
  3434                              <1> ;	jna	short csftdf2_df_check_found_or_not
  3435                              <1> ;
  3436                              <1> ;csftdf2_df_change_directory:
  3437                              <1> ;	inc	byte [Restore_CDIR]
  3438                              <1> ;	xor	ah, ah ; CD_COMMAND sign -> 0 
  3439                              <1> ;	call	change_current_directory
  3440                              <1> ;	jc	short csftdf2_stc_return
  3441                              <1> ;
  3442                              <1> ;;csftdf2_df_change_prompt_dir_string:
  3443                              <1> ;;	call	change_prompt_dir_string
  3444                              <1> 
  3445                              <1> csftdf2_df_check_found_or_not:
  3446                              <1> 	; 21/03/2016
  3447 0000C405 803D[668D0100]00    <1> 	cmp	byte [DestinationFileFound], 0 
  3448 0000C40C 7739                <1> 	ja	short csftdf2_set_sf_percentage
  3449                              <1> 
  3450                              <1> csftdf2_create_file:
  3451 0000C40E BE[FE8C0100]        <1> 	mov	esi, DestinationFile_Name
  3452 0000C413 A1[688D0100]        <1> 	mov	eax, [csftdf_filesize]
  3453 0000C418 30C9                <1> 	xor	cl, cl ; 0
  3454                              <1> 
  3455 0000C41A 31DB                <1> 	xor	ebx, ebx ; 0
  3456 0000C41C 4B                  <1> 	dec	ebx ; 0FFFFFFFFh 
  3457                              <1> 
  3458                              <1> 	; INPUT ->
  3459                              <1> 	; 	EAX -> File Size
  3460                              <1> 	; 	ESI = ASCIIZ File name
  3461                              <1> 	;	 CL = File attributes
  3462                              <1> 	;	EBX = FFFFFFFFh -> empty file sign for FAT fs
  3463                              <1> 	;	EBX <> FFFFFFFFh -> use file size for FAT fs 
  3464                              <1> 	;
  3465                              <1> 	; OUTPUT ->
  3466                              <1> 	;	EAX = New file's first cluster
  3467                              <1> 	;	ESI = Logical Dos Drv Descr. Table Addr.
  3468                              <1> 	;	EBX = CreateFile_Size address
  3469                              <1> 	;	ECX = Sectors per cluster (<256)
  3470                              <1> 	;	EDX = Directory Entry Index/Number (<65536)
  3471                              <1> 	;		
  3472                              <1> 	;	cf = 1 -> error code in AL (EAX)
  3473                              <1> 
  3474 0000C41D E8EC050000          <1> 	call	create_file
  3475                              <1> 	;pop	esi
  3476 0000C422 0F82A3050000        <1>         jc      csftdf2_rw_error
  3477                              <1> 
  3478                              <1> csftdf2_create_file_OK:
  3479 0000C428 A3[788D0100]        <1> 	mov	[csftdf_df_cluster], eax
  3480                              <1> 	
  3481                              <1> 	; 24/03/2016
  3482 0000C42D 668915[368D0100]    <1> 	mov	[DestinationFile_DirEntryNumber], dx 
  3483                              <1> 
  3484                              <1> 	; 21/03/2016
  3485 0000C434 BE00000800          <1> 	mov	esi, Directory_Buffer
  3486 0000C439 C1E205              <1> 	shl	edx, 5 ; 32 * index number
  3487 0000C43C 01D6                <1> 	add	esi, edx
  3488 0000C43E BF[0E8D0100]        <1> 	mov	edi, DestinationFile_DirEntry	
  3489 0000C443 B108                <1> 	mov	cl, 8 ; 32 bytes
  3490 0000C445 F3A5                <1> 	rep	movsd
  3491                              <1> 
  3492                              <1> csftdf2_set_sf_percentage:
  3493                              <1> 	; 17/03/2016
  3494 0000C447 31C0                <1> 	xor	eax, eax	
  3495 0000C449 A2[8C8D0100]        <1> 	mov 	[csftdf_percentage], al ; 0, reset
  3496                              <1> 
  3497 0000C44E A3[848D0100]        <1> 	mov	[csftdf_sf_rbytes], eax ; 0, reset
  3498 0000C453 A3[888D0100]        <1> 	mov	[csftdf_df_wbytes], eax ; 0, reset
  3499                              <1> 
  3500 0000C458 8A25[3C8C0100]      <1> 	mov	ah, [SourceFile_Drv]	
  3501 0000C45E BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3502 0000C463 01C6                <1> 	add	esi, eax
  3503                              <1> 	
  3504 0000C465 8935[908D0100]      <1> 	mov	[csftdf_sf_drv_dt], esi ; 23/03/2016
  3505                              <1> 
  3506 0000C46B 668B15[A28C0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusHI]
  3507 0000C472 C1E210              <1> 	shl	edx, 16
  3508 0000C475 668B15[A88C0100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusLO]
  3509 0000C47C 8915[748D0100]      <1> 	mov	[csftdf_sf_cluster], edx
  3510                              <1> 
  3511                              <1> 	; 16/03/2016
  3512                              <1> 	; Note: Singlix FS boot sector parameters (for cluster
  3513                              <1> 	;	related calculations) has same offset
  3514                              <1> 	;	values from LD_BPB as in FAT file system.
  3515                              <1> 	;	[esi+LD_BPB+SecPerClust] is 1 for Singlix FS.
  3516                              <1> 	;	
  3517 0000C482 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  3518 0000C486 880D[BA8C0100]      <1> 	mov	[SourceFile_SecPerClust], cl
  3519                              <1> 
  3520                              <1> 	; 17/03/2016
  3521 0000C48C 386E03              <1> 	cmp	[esi+LD_FATType], ch ; 0
  3522 0000C48F 7707                <1> 	ja	short csftdf2_set_sf_percent_rsize1
  3523                              <1> 
  3524 0000C491 B800000100          <1> 	mov	eax, 65536 ; read/write buffer size for Singlix FS
  3525 0000C496 EB06                <1> 	jmp	short csftdf2_set_sf_percent_rsize2	
  3526                              <1>  
  3527                              <1> csftdf2_set_sf_percent_rsize1:
  3528 0000C498 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec]
  3529 0000C49C F7E1                <1> 	mul	ecx
  3530                              <1> 	;sub	edx, edx
  3531                              <1> csftdf2_set_sf_percent_rsize2:
  3532 0000C49E A3[7C8D0100]        <1> 	mov	[csftdf_r_size], eax
  3533                              <1> 
  3534                              <1> csftdf2_set_df_percentage:
  3535                              <1> 	;sub	eax, eax
  3536                              <1> 	;mov	ah, [DestinationFile_Drv]	
  3537                              <1> 	;mov	edi, Logical_DOSDisks
  3538                              <1> 	;add	edi, eax
  3539                              <1> 	;mov	[csftdf_df_drv_dt], edi ; 17/03/2016
  3540                              <1> 
  3541 0000C4A3 8B3D[948D0100]      <1> 	mov	edi, [csftdf_df_drv_dt] ; 23/03/2016
  3542                              <1> 
  3543                              <1> 	; 16/03/2016
  3544                              <1> 	; Note: Singlix FS boot sector parameters (for cluster
  3545                              <1> 	;	related calculations) has same offset
  3546                              <1> 	;	values from LD_BPB as in FAT file system.
  3547                              <1> 	;	[edi+LD_BPB+SecPerClust] is 1 for Singlix FS.
  3548                              <1> 	;	
  3549                              <1> 	;movzx	ecx, byte [edi+LD_BPB+SecPerClust]
  3550 0000C4A9 8A4F13              <1> 	mov	cl, [edi+LD_BPB+SecPerClust]
  3551 0000C4AC 880D[3A8D0100]      <1> 	mov	[DestinationFile_SecPerClust], cl
  3552                              <1> 
  3553                              <1> 	; 17/03/2016
  3554 0000C4B2 386F03              <1> 	cmp	[edi+LD_FATType], ch ; 0
  3555 0000C4B5 7707                <1> 	ja	short csftdf2_set_df_percent_wsize1
  3556                              <1> 	
  3557 0000C4B7 B800000100          <1> 	mov	eax, 65536 ; read/write buffer size for Singlix FS
  3558 0000C4BC EB06                <1> 	jmp	short csftdf2_set_df_percent_wsize2	
  3559                              <1> 
  3560                              <1> csftdf2_set_df_percent_wsize1:
  3561 0000C4BE 0FB74711            <1> 	movzx	eax, word [edi+LD_BPB+BytesPerSec]
  3562 0000C4C2 F7E1                <1> 	mul	ecx
  3563                              <1> 	;sub	edx, edx
  3564                              <1> csftdf2_set_df_percent_wsize2:
  3565 0000C4C4 A3[808D0100]        <1> 	mov	[csftdf_w_size], eax
  3566                              <1> 
  3567 0000C4C9 A1[688D0100]        <1> 	mov	eax, [csftdf_filesize]
  3568                              <1> 
  3569 0000C4CE 3D00000100          <1> 	cmp	eax, 65536 ; 64KB	; small file
  3570 0000C4D3 721F                <1> 	jb	short csftdf2_load_file ; do not display percentage
  3571                              <1> 	
  3572                              <1> csftdf2_reset_wf_percent_ptr_chk_64k:
  3573 0000C4D5 B201                <1> 	mov	dl, 1 ; 25/03/2016
  3574                              <1> 
  3575 0000C4D7 3D00000400          <1> 	cmp	eax, 65536*4 ; 256KB
  3576 0000C4DC 7310                <1> 	jnb	short csftdf2_enable_percentage_display ; big file
  3577                              <1> 
  3578                              <1> 	; 64-128KB file size for floppy disks
  3579 0000C4DE 3815[3C8C0100]      <1> 	cmp	byte [SourceFile_Drv], dl ; 1 ; read from floppy disk ?
  3580 0000C4E4 7608                <1> 	jna	short csftdf2_enable_percentage_display
  3581                              <1> 
  3582 0000C4E6 3815[BC8C0100]      <1> 	cmp	byte [DestinationFile_Drv], dl ; 1 ; write to floppy disk ?
  3583 0000C4EC 7706                <1> 	ja	short csftdf2_load_file
  3584                              <1> 
  3585                              <1> csftdf2_enable_percentage_display:	
  3586 0000C4EE 8815[8C8D0100]      <1> 	mov	[csftdf_percentage], dl ; 1	
  3587                              <1> 	
  3588                              <1> csftdf2_load_file:
  3589                              <1> 	; 13/05/2016
  3590                              <1> 	; 19/03/2016
  3591                              <1> 	; 18/03/2016
  3592                              <1> 	; 17/03/2016
  3593 0000C4F4 B40F                <1> 	mov	ah, 0Fh
  3594 0000C4F6 E86E52FFFF          <1> 	call	_int10h
  3595                              <1> 	; 13/05/2016
  3596 0000C4FB 883D[8D8D0100]      <1> 	mov	[csftdf_videopage], bh ; active video page
  3597 0000C501 B403                <1> 	mov	ah, 03h
  3598 0000C503 E86152FFFF          <1> 	call	_int10h
  3599 0000C508 668915[8E8D0100]    <1> 	mov	[csftdf_cursorpos], dx
  3600                              <1> 
  3601 0000C50F 29C0                <1> 	sub	eax, eax
  3602 0000C511 A2[658D0100]        <1> 	mov	[csftdf_rw_err], al ; 0 
  3603                              <1> 
  3604                              <1> ; ///
  3605                              <1> csftdf_sf_amb: ; 15/03/2016
  3606 0000C516 8B0D[688D0100]      <1> 	mov	ecx, [csftdf_filesize]	; 23/03/2016
  3607                              <1> 
  3608                              <1> 	; TRDOS 386 (TRDOS v2.0)
  3609                              <1> 	; Allocate contiguous memory block for loading the file
  3610                              <1> 	
  3611                              <1> 	;mov	ecx, [SourceFile_DirEntry+DirEntry_FileSize]
  3612                              <1> 	
  3613                              <1> 	;sub	eax, eax ; First free memory aperture
  3614                              <1> 	
  3615                              <1> 	; eax = 0 (Allocate memory from the beginning)
  3616                              <1> 	; ecx = File (Allocation) size in bytes
  3617                              <1> 	
  3618 0000C51C E8529FFFFF          <1> 	call	allocate_memory_block
  3619 0000C521 7304                <1> 	jnc	short loc_check_sf_save_loading_parms
  3620                              <1> 
  3621 0000C523 29C0                <1> 	sub	eax, eax
  3622 0000C525 29C9                <1> 	sub	ecx, ecx
  3623                              <1> 	
  3624                              <1> loc_check_sf_save_loading_parms:
  3625 0000C527 A3[6C8D0100]        <1> 	mov	[csftdf_sf_mem_addr], eax ; loading address
  3626 0000C52C 890D[708D0100]      <1> 	mov	[csftdf_sf_mem_bsize], ecx ; block size
  3627                              <1> ; ///   
  3628                              <1> 	; 19/03/2016
  3629 0000C532 8B35[908D0100]      <1> 	mov	esi, [csftdf_sf_drv_dt] ; logical dos drv desc. tbl.
  3630                              <1> 
  3631                              <1> 	; 17/03/2016
  3632 0000C538 09C0                <1> 	or	eax, eax ; contiguous free memory block address 
  3633 0000C53A 0F845B010000        <1>         jz      csftdf2_read_sf_cluster
  3634                              <1> 
  3635                              <1> 	; 18/03/2016
  3636 0000C540 8B1D[6C8D0100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  3637                              <1> 
  3638 0000C546 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3639 0000C54A 0F8605020000        <1>         jna     csftdf2_load_fs_file
  3640                              <1> 
  3641                              <1> csftdf2_load_fat_file:
  3642 0000C550 53                  <1> 	push	ebx ; *
  3643                              <1> 
  3644                              <1> csftdf2_load_fat_file_next:
  3645 0000C551 BE[733E0100]        <1> 	mov	esi, msg_reading
  3646 0000C556 E8EAAFFFFF          <1> 	call	print_msg
  3647                              <1> 
  3648 0000C55B 803D[8C8D0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3649 0000C562 7605                <1> 	jna	short csftdf2_load_fat_file_1
  3650                              <1> 	
  3651 0000C564 E87C000000          <1> 	call	csftdf2_print_percentage ; 19/03/2016
  3652                              <1> 
  3653                              <1> csftdf2_load_fat_file_1:
  3654 0000C569 8B35[908D0100]      <1> 	mov	esi, [csftdf_sf_drv_dt]	
  3655 0000C56F 5B                  <1> 	pop	ebx ; *
  3656                              <1> 
  3657                              <1> csftdf2_load_fat_file_2:
  3658 0000C570 E8B8000000          <1> 	call	csftdf2_read_fat_file_sectors ; 19/03/2016
  3659 0000C575 0F8250040000        <1>         jc      csftdf2_rw_error ; eocc! or disk error! 
  3660                              <1> 
  3661 0000C57B 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3662 0000C57D 7520                <1> 	jnz	short csftdf2_load_fat_file_ok
  3663                              <1> 
  3664 0000C57F 803D[8C8D0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3665 0000C586 76E8                <1> 	jna	short csftdf2_load_fat_file_2
  3666                              <1> 
  3667 0000C588 53                  <1> 	push	ebx ; *	
  3668                              <1> 
  3669                              <1> 	; Set cursor position
  3670                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  3671 0000C589 8A3D[8D8D0100]      <1> 	mov	bh, [csftdf_videopage]
  3672 0000C58F 668B15[8E8D0100]    <1> 	mov	dx, [csftdf_cursorpos]
  3673 0000C596 B402                <1> 	mov	ah, 2
  3674 0000C598 E8CC51FFFF          <1> 	call	_int10h
  3675 0000C59D EBB2                <1> 	jmp	short csftdf2_load_fat_file_next
  3676                              <1> 	
  3677                              <1> csftdf2_load_fat_file_ok:
  3678 0000C59F 803D[8C8D0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3679 0000C5A6 0F8651020000        <1>         jna     csftdf2_save_file ; 25/03/2016
  3680                              <1> 	
  3681                              <1> 	; "Reading... 100%"
  3682 0000C5AC BF[8B3E0100]        <1> 	mov	edi, percentagestr
  3683 0000C5B1 B031                <1> 	mov	al, '1'
  3684 0000C5B3 AA                  <1> 	stosb
  3685 0000C5B4 B030                <1> 	mov	al, '0'
  3686 0000C5B6 AA                  <1> 	stosb
  3687 0000C5B7 AA                  <1> 	stosb
  3688                              <1> 
  3689 0000C5B8 8A3D[8D8D0100]      <1> 	mov	bh, [csftdf_videopage]
  3690 0000C5BE 668B15[8E8D0100]    <1> 	mov	dx, [csftdf_cursorpos]
  3691 0000C5C5 B402                <1> 	mov	ah, 2
  3692 0000C5C7 E89D51FFFF          <1> 	call	_int10h
  3693                              <1> 
  3694 0000C5CC BE[733E0100]        <1> 	mov	esi, msg_reading
  3695 0000C5D1 E86FAFFFFF          <1> 	call	print_msg
  3696                              <1> 	
  3697 0000C5D6 BE[8B3E0100]        <1> 	mov	esi, percentagestr
  3698 0000C5DB E865AFFFFF          <1> 	call	print_msg
  3699                              <1> 
  3700 0000C5E0 E918020000          <1>         jmp     csftdf2_save_file ; 25/03/2016
  3701                              <1> 
  3702                              <1> csftdf2_print_percentage:
  3703                              <1> 	; 09/12/2017
  3704                              <1> 	; 19/03/2016
  3705                              <1> 	; 18/03/2016
  3706 0000C5E5 B020                <1> 	mov	al, 20h
  3707 0000C5E7 BF[8B3E0100]        <1> 	mov	edi, percentagestr
  3708 0000C5EC AA                  <1> 	stosb
  3709 0000C5ED AA                  <1> 	stosb
  3710 0000C5EE A1[848D0100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  3711 0000C5F3 BA64000000          <1> 	mov	edx, 100
  3712 0000C5F8 F7E2                <1> 	mul	edx
  3713 0000C5FA 8B0D[688D0100]      <1> 	mov	ecx, [csftdf_filesize]	
  3714 0000C600 F7F1                <1> 	div	ecx
  3715 0000C602 B10A                <1> 	mov	cl, 10
  3716 0000C604 F6F1                <1> 	div	cl
  3717 0000C606 80C430              <1> 	add	ah, '0'
  3718 0000C609 8827                <1> 	mov	[edi], ah
  3719 0000C60B 20C0                <1> 	and	al, al
  3720 0000C60D 740A                <1> 	jz	short csftdf2_print_percent_1
  3721 0000C60F 4F                  <1> 	dec	edi
  3722                              <1> 	;cbw
  3723 0000C610 28E4                <1> 	sub	ah, ah ; 09/12/2017
  3724 0000C612 F6F1                <1> 	div	cl
  3725 0000C614 80C430              <1> 	add	ah, '0'
  3726 0000C617 8827                <1> 	mov	[edi], ah
  3727                              <1> 	;and	al, al
  3728                              <1> 	;jz	short csftdf2_print_percent_1
  3729                              <1> 	;dec	edi
  3730                              <1> 	;mov	[edi], '1' ; 100%		
  3731                              <1> 
  3732                              <1> csftdf2_print_percent_1:
  3733 0000C619 BE[8B3E0100]        <1> 	mov	esi, percentagestr
  3734                              <1> 	;call	print_msg
  3735                              <1> 	;retn
  3736 0000C61E E922AFFFFF          <1> 	jmp	print_msg
  3737                              <1> 
  3738                              <1> csftdf2_read_file_sectors:
  3739                              <1> 	; 19/03/2016
  3740 0000C623 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3741 0000C627 0F8627070000        <1>         jna     csftdf2_read_fs_file_sectors
  3742                              <1> 
  3743                              <1> csftdf2_read_fat_file_sectors:
  3744                              <1> 	; 19/03/2016
  3745                              <1> 	; 18/03/2016
  3746                              <1> 	; return:
  3747                              <1> 	;   CF = 0 & EDX > 0 -> END OF FILE
  3748                              <1> 	;   CF = 0 & EDX = 0 -> not EOF
  3749                              <1> 	;   CF = 1 -> read error (error code in AL)	
  3750                              <1> 
  3751                              <1> csftdf2_read_fat_file_secs_0:
  3752 0000C62D 8B15[688D0100]      <1> 	mov	edx, [csftdf_filesize]
  3753 0000C633 2B15[848D0100]      <1> 	sub	edx, [csftdf_sf_rbytes]
  3754 0000C639 3B15[7C8D0100]      <1> 	cmp	edx, [csftdf_r_size]	
  3755 0000C63F 7306                <1> 	jnb	short csftdf2_read_fat_file_secs_1
  3756 0000C641 8915[7C8D0100]      <1> 	mov	[csftdf_r_size], edx
  3757                              <1> 		
  3758                              <1> csftdf2_read_fat_file_secs_1:
  3759 0000C647 A1[7C8D0100]        <1> 	mov	eax, [csftdf_r_size]
  3760 0000C64C 29D2                <1> 	sub	edx, edx
  3761 0000C64E 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  3762 0000C652 01C8                <1> 	add	eax, ecx
  3763 0000C654 48                  <1> 	dec	eax
  3764 0000C655 F7F1                <1> 	div	ecx
  3765 0000C657 89C1                <1> 	mov	ecx, eax ; sector count
  3766 0000C659 A1[748D0100]        <1> 	mov	eax, [csftdf_sf_cluster]
  3767                              <1> 
  3768                              <1> 	; EBX = memory block address (current)
  3769                              <1> 	
  3770 0000C65E E821090000          <1> 	call	read_fat_file_sectors
  3771 0000C663 7235                <1> 	jc	short csftdf2_read_fat_file_secs_3
  3772                              <1> 
  3773                              <1> 	; EBX = next memory address
  3774                              <1> 
  3775 0000C665 A1[848D0100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  3776 0000C66A 0305[7C8D0100]      <1> 	add	eax, [csftdf_r_size]
  3777 0000C670 8B15[688D0100]      <1> 	mov	edx, [csftdf_filesize]
  3778 0000C676 39D0                <1> 	cmp	eax, edx
  3779 0000C678 7320                <1> 	jnb	short csftdf2_read_fat_file_secs_3 ; edx > 0
  3780 0000C67A A3[848D0100]        <1> 	mov	[csftdf_sf_rbytes], eax
  3781                              <1> 
  3782 0000C67F 53                  <1> 	push	ebx ; *
  3783                              <1> 	; get next cluster (csftdf_r_size! bytes)
  3784 0000C680 A1[748D0100]        <1> 	mov	eax, [csftdf_sf_cluster]
  3785 0000C685 E8CC060000          <1> 	call	get_next_cluster
  3786 0000C68A 5B                  <1> 	pop	ebx ; *
  3787 0000C68B 7306                <1> 	jnc	short csftdf2_read_fat_file_secs_2
  3788                              <1> 
  3789                              <1> 	; 15/10/2016
  3790                              <1> 	;Disk read error instad of drv not ready err
  3791 0000C68D B811000000          <1> 	mov	eax, 17 ; Read error !
  3792 0000C692 C3                  <1> 	retn
  3793                              <1> 
  3794                              <1> csftdf2_read_fat_file_secs_2:
  3795 0000C693 29D2                <1> 	sub	edx, edx ; 0
  3796 0000C695 A3[748D0100]        <1> 	mov	[csftdf_sf_cluster], eax ; next cluster
  3797                              <1> 
  3798                              <1> csftdf2_read_fat_file_secs_3:
  3799 0000C69A C3                  <1> 	retn
  3800                              <1> 
  3801                              <1> csftdf2_read_sf_cluster:
  3802                              <1> 	; 19/03/2016
  3803 0000C69B BB00000700          <1> 	mov	ebx, Cluster_Buffer ; buffer address (64KB)
  3804                              <1> 
  3805 0000C6A0 803D[8C8D0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3806 0000C6A7 760D                <1> 	jna	short csftdf2_read_sf_clust_2
  3807                              <1> 
  3808 0000C6A9 53                  <1> 	push	ebx ; *	
  3809                              <1> 
  3810                              <1> csftdf2_read_sf_clust_next:
  3811 0000C6AA E836FFFFFF          <1> 	call	csftdf2_print_percentage
  3812                              <1> 
  3813                              <1> csftdf2_read_sf_clust_0:
  3814 0000C6AF 8B35[908D0100]      <1> 	mov	esi, [csftdf_sf_drv_dt]	
  3815                              <1> csftdf2_read_sf_clust_1:
  3816 0000C6B5 5B                  <1> 	pop	ebx ; *
  3817                              <1> 
  3818                              <1> csftdf2_read_sf_clust_2:
  3819 0000C6B6 89DA                <1> 	mov	edx, ebx
  3820 0000C6B8 0315[7C8D0100]      <1> 	add	edx, [csftdf_r_size]
  3821 0000C6BE 81FA00000800        <1> 	cmp	edx, Cluster_Buffer + 65536
  3822 0000C6C4 772F                <1> 	ja	short csftdf2_write_df_cluster
  3823                              <1> 
  3824 0000C6C6 E858FFFFFF          <1> 	call	csftdf2_read_file_sectors ; 19/03/2016
  3825 0000C6CB 0F8280020000        <1>         jc      csftdf2_save_fat_file_err2 ; eocc! or disk error! 
  3826                              <1> 
  3827 0000C6D1 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3828 0000C6D3 7520                <1> 	jnz	short csftdf2_write_df_cluster
  3829                              <1> 
  3830 0000C6D5 803D[8C8D0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3831 0000C6DC 76D8                <1> 	jna	short csftdf2_read_sf_clust_2
  3832                              <1> 
  3833 0000C6DE 53                  <1> 	push	ebx ; *	
  3834                              <1> 
  3835                              <1> 	; Set cursor position
  3836                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  3837 0000C6DF 8A3D[8D8D0100]      <1> 	mov	bh, [csftdf_videopage]
  3838 0000C6E5 668B15[8E8D0100]    <1> 	mov	dx, [csftdf_cursorpos]
  3839 0000C6EC B402                <1> 	mov	ah, 2
  3840 0000C6EE E87650FFFF          <1> 	call	_int10h
  3841 0000C6F3 EBB5                <1> 	jmp	short csftdf2_read_sf_clust_next
  3842                              <1> 
  3843                              <1> csftdf2_write_df_cluster:
  3844                              <1> 	; 19/03/2016
  3845 0000C6F5 8B35[948D0100]      <1> 	mov	esi, [csftdf_df_drv_dt]	
  3846 0000C6FB BB00000700          <1> 	mov	ebx, Cluster_Buffer ; buffer address (64KB)
  3847                              <1> 
  3848                              <1> csftdf2_write_df_clust_next:
  3849 0000C700 E855000000          <1> 	call	csftdf2_write_file_sectors ; 19/03/2016
  3850 0000C705 0F8246020000        <1>         jc      csftdf2_save_fat_file_err2 ; eocc! or disk error! 
  3851                              <1> 
  3852 0000C70B 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3853 0000C70D 750A                <1> 	jnz	short csftdf2_rw_f_clust_ok
  3854                              <1> 
  3855 0000C70F 81FB00000800        <1> 	cmp	ebx, Cluster_Buffer + 65536
  3856 0000C715 72E9                <1> 	jb	short csftdf2_write_df_clust_next
  3857                              <1> 	
  3858 0000C717 EB82                <1> 	jmp	short csftdf2_read_sf_cluster
  3859                              <1>  
  3860                              <1> csftdf2_rw_f_clust_ok:
  3861 0000C719 803D[8C8D0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3862 0000C720 0F86B2010000        <1>         jna     csftdf2_save_fat_file_4 ; 25/03/2016
  3863                              <1> 
  3864                              <1> 	; "100%"
  3865 0000C726 BF[8B3E0100]        <1> 	mov	edi, percentagestr
  3866 0000C72B B031                <1> 	mov	al, '1'
  3867 0000C72D AA                  <1> 	stosb
  3868 0000C72E B030                <1> 	mov	al, '0'
  3869 0000C730 AA                  <1> 	stosb
  3870 0000C731 AA                  <1> 	stosb
  3871                              <1> 
  3872 0000C732 8A3D[8D8D0100]      <1> 	mov	bh, [csftdf_videopage]
  3873 0000C738 668B15[8E8D0100]    <1> 	mov	dx, [csftdf_cursorpos]
  3874 0000C73F B402                <1> 	mov	ah, 2
  3875 0000C741 E82350FFFF          <1> 	call	_int10h
  3876                              <1> 
  3877 0000C746 BE[8B3E0100]        <1> 	mov	esi, percentagestr
  3878 0000C74B E8F5ADFFFF          <1> 	call	print_msg
  3879                              <1> 
  3880 0000C750 E983010000          <1>         jmp     csftdf2_save_fat_file_4
  3881                              <1> 
  3882                              <1> csftdf2_load_fs_file:
  3883                              <1> 	; temporary - 18/03/2016
  3884 0000C755 E96F020000          <1>         jmp     csftdf2_read_error
  3885                              <1> 
  3886                              <1> csftdf2_write_file_sectors:
  3887                              <1> 	; 19/03/2016
  3888 0000C75A 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3889 0000C75E 0F86F1050000        <1>         jna     csftdf2_write_fs_file_sectors
  3890                              <1> 
  3891                              <1> csftdf2_write_fat_file_sectors:
  3892                              <1> 	; 19/03/2016
  3893                              <1> 	; 18/03/2016
  3894                              <1> 	; return:
  3895                              <1> 	;   CF = 0 & EDX > 0 -> END OF FILE
  3896                              <1> 	;   CF = 0 & EDX = 0 -> not EOF
  3897                              <1> 	;   CF = 1 -> write error (error code in AL)	
  3898                              <1> 
  3899                              <1> csftdf2_write_fat_file_secs_0:
  3900 0000C764 8B15[688D0100]      <1> 	mov	edx, [csftdf_filesize]
  3901 0000C76A 2B15[888D0100]      <1> 	sub	edx, [csftdf_df_wbytes]
  3902 0000C770 3B15[808D0100]      <1> 	cmp	edx, [csftdf_w_size]	
  3903 0000C776 7306                <1> 	jnb	short csftdf2_write_fat_file_secs_1
  3904 0000C778 8915[808D0100]      <1> 	mov	[csftdf_w_size], edx		
  3905                              <1> 
  3906                              <1> csftdf2_write_fat_file_secs_1:
  3907 0000C77E A1[808D0100]        <1> 	mov	eax, [csftdf_w_size]
  3908 0000C783 29D2                <1> 	sub	edx, edx
  3909 0000C785 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  3910 0000C789 01C8                <1> 	add	eax, ecx
  3911 0000C78B 48                  <1> 	dec	eax
  3912 0000C78C F7F1                <1> 	div	ecx
  3913 0000C78E 89C1                <1> 	mov	ecx, eax ; sector count
  3914 0000C790 A1[788D0100]        <1> 	mov	eax, [csftdf_df_cluster]
  3915                              <1> 
  3916                              <1> 	; EBX = memory block address (current)	
  3917                              <1> 
  3918 0000C795 E8A20F0000          <1> 	call	write_fat_file_sectors
  3919 0000C79A 7259                <1> 	jc	short csftdf2_write_fat_file_secs_4
  3920                              <1> 
  3921                              <1> 	; EBX = next memory address
  3922                              <1> 
  3923 0000C79C A1[888D0100]        <1> 	mov	eax, [csftdf_df_wbytes]
  3924 0000C7A1 0305[808D0100]      <1> 	add	eax, [csftdf_w_size]
  3925 0000C7A7 8B15[688D0100]      <1> 	mov	edx, [csftdf_filesize]
  3926 0000C7AD 39D0                <1> 	cmp	eax, edx
  3927 0000C7AF 7344                <1> 	jnb	short csftdf2_write_fat_file_secs_4
  3928 0000C7B1 A3[888D0100]        <1> 	mov	[csftdf_df_wbytes], eax
  3929                              <1> 	;
  3930 0000C7B6 A3[2A8D0100]        <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], eax
  3931                              <1> 
  3932 0000C7BB 53                  <1> 	push	ebx ; *
  3933                              <1> 
  3934 0000C7BC 803D[668D0100]01    <1> 	cmp	byte [DestinationFileFound], 1
  3935 0000C7C3 7210                <1> 	jb	short csftdf2_write_fat_file_secs_2
  3936                              <1> 
  3937                              <1> 	; get next cluster (csftdf_w_size! bytes)
  3938 0000C7C5 A1[788D0100]        <1> 	mov	eax, [csftdf_df_cluster]
  3939 0000C7CA E887050000          <1> 	call	get_next_cluster
  3940 0000C7CF 731C                <1> 	jnc	short csftdf2_write_fat_file_secs_3
  3941                              <1> 
  3942 0000C7D1 21C0                <1> 	and	eax, eax ; end of cluster chain!?
  3943 0000C7D3 7521                <1> 	jnz	short csftdf2_write_fat_file_secs_5 ; disk error !
  3944                              <1> 
  3945                              <1> csftdf2_write_fat_file_secs_2:
  3946 0000C7D5 A1[788D0100]        <1> 	mov	eax, [csftdf_df_cluster] ; last cluster
  3947 0000C7DA E8800E0000          <1> 	call	add_new_cluster		
  3948 0000C7DF 7215                <1> 	jc	short csftdf2_write_fat_file_secs_5
  3949                              <1> 
  3950                              <1> 	; NOTE: Destination file size may be bigger than
  3951                              <1> 	; source file size when the last reading fails after here.
  3952                              <1> 	; (The last -empty- cluster of destination file must be 
  3953                              <1> 	; truncated and LMDT must be current date&time for partial
  3954                              <1> 	; copy result!) 
  3955 0000C7E1 8B15[808D0100]      <1> 	mov	edx, [csftdf_w_size] ; bytes per cluster
  3956 0000C7E7 0115[2A8D0100]      <1> 	add	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  3957                              <1> 
  3958                              <1> csftdf2_write_fat_file_secs_3:
  3959 0000C7ED 5B                  <1> 	pop	ebx ; *
  3960 0000C7EE 29D2                <1> 	sub	edx, edx ; 0
  3961 0000C7F0 A3[788D0100]        <1> 	mov	[csftdf_df_cluster], eax ; next cluster
  3962                              <1> 
  3963                              <1> csftdf2_write_fat_file_secs_4:
  3964 0000C7F5 C3                  <1> 	retn
  3965                              <1> 
  3966                              <1> csftdf2_write_fat_file_secs_5:
  3967 0000C7F6 5B                  <1> 	pop	ebx ; *
  3968                              <1> 	; 16/10/2016 (1Dh -> 18)
  3969 0000C7F7 B812000000          <1> 	mov	eax, 18 ; Write error !
  3970 0000C7FC C3                  <1> 	retn
  3971                              <1> 
  3972                              <1> csftdf2_save_file:
  3973                              <1> 	; 09/12/2017
  3974                              <1> 	; 25/03/2016
  3975                              <1> 	; 19/03/2016
  3976                              <1> 	; 18/03/2016
  3977 0000C7FD 8B35[948D0100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; logical dos drv desc. tbl.
  3978                              <1> 
  3979 0000C803 8B1D[6C8D0100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  3980                              <1> 
  3981 0000C809 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3982 0000C80D 0F86F4010000        <1>         jna     csftdf2_save_fs_file
  3983                              <1> 
  3984                              <1> csftdf2_save_fat_file:
  3985 0000C813 53                  <1> 	push	ebx; *
  3986                              <1> 
  3987 0000C814 803D[8C8D0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3988 0000C81B 7724                <1> 	ja	short csftdf2_save_fat_file_0
  3989                              <1> 
  3990                              <1> 	; Set cursor position
  3991                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  3992 0000C81D 8A3D[8D8D0100]      <1> 	mov	bh, [csftdf_videopage]
  3993 0000C823 668B15[8E8D0100]    <1> 	mov	dx, [csftdf_cursorpos]
  3994 0000C82A B402                <1> 	mov	ah, 2
  3995 0000C82C E8384FFFFF          <1> 	call	_int10h
  3996                              <1> 	
  3997 0000C831 BE[7F3E0100]        <1> 	mov	esi, msg_writing
  3998 0000C836 E80AADFFFF          <1> 	call	print_msg
  3999                              <1> 
  4000                              <1> csftdf2_save_fat_file_next:
  4001 0000C83B 8B35[948D0100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 25/03/2016
  4002                              <1> 
  4003                              <1> csftdf2_save_fat_file_0:
  4004 0000C841 5B                  <1> 	pop	ebx ; *
  4005                              <1> 
  4006                              <1> csftdf2_save_fat_file_1:
  4007 0000C842 E813FFFFFF          <1> 	call	csftdf2_write_file_sectors ; 19/03/2016	
  4008 0000C847 0F827E010000        <1>         jc      csftdf2_rw_error ; eocc! or disk error! 
  4009                              <1> 
  4010 0000C84D 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  4011 0000C84F 756D                <1>         jnz     short csftdf2_save_fat_file_3 ; 25/03/2016
  4012                              <1> 
  4013 0000C851 803D[8C8D0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  4014 0000C858 76E8                <1> 	jna	short csftdf2_save_fat_file_1
  4015                              <1> 
  4016 0000C85A B020                <1> 	mov	al, 20h
  4017 0000C85C BF[8B3E0100]        <1> 	mov	edi, percentagestr
  4018 0000C861 AA                  <1> 	stosb
  4019 0000C862 AA                  <1> 	stosb
  4020 0000C863 A1[888D0100]        <1> 	mov	eax, [csftdf_df_wbytes]
  4021 0000C868 BA64000000          <1> 	mov	edx, 100
  4022 0000C86D F7E2                <1> 	mul	edx
  4023 0000C86F 8B0D[688D0100]      <1> 	mov	ecx, [csftdf_filesize]	
  4024 0000C875 F7F1                <1> 	div	ecx
  4025 0000C877 B10A                <1> 	mov	cl, 10
  4026 0000C879 F6F1                <1> 	div	cl
  4027 0000C87B 80C430              <1> 	add	ah, '0'
  4028 0000C87E 8827                <1> 	mov	[edi], ah
  4029 0000C880 20C0                <1> 	and	al, al
  4030 0000C882 740A                <1> 	jz	short csftdf2_save_fat_file_2
  4031 0000C884 4F                  <1> 	dec	edi
  4032                              <1> 	;cbw
  4033 0000C885 30E4                <1> 	xor	ah, ah ; 09/12/2017
  4034 0000C887 F6F1                <1> 	div	cl
  4035 0000C889 80C430              <1> 	add	ah, '0'
  4036 0000C88C 8827                <1> 	mov	[edi], ah
  4037                              <1> 	;and	al, al
  4038                              <1> 	;jz	short csftdf2_save_fat_file_2
  4039                              <1> 	;dec	edi
  4040                              <1> 	;mov	[edi], '1' ; 100%		
  4041                              <1> 
  4042                              <1> csftdf2_save_fat_file_2:
  4043 0000C88E 53                  <1> 	push	ebx ; *
  4044                              <1> 
  4045 0000C88F E802000000          <1> 	call	csftdf2_print_wr_percentage ; 25/03/2016
  4046                              <1> 
  4047 0000C894 EBA5                <1>         jmp     csftdf2_save_fat_file_next
  4048                              <1> 
  4049                              <1> csftdf2_print_wr_percentage:
  4050                              <1> 	; Set cursor position
  4051                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  4052 0000C896 8A3D[8D8D0100]      <1> 	mov	bh, [csftdf_videopage]
  4053 0000C89C 668B15[8E8D0100]    <1> 	mov	dx, [csftdf_cursorpos]
  4054 0000C8A3 B402                <1> 	mov	ah, 2
  4055 0000C8A5 E8BF4EFFFF          <1> 	call	_int10h
  4056                              <1> 
  4057 0000C8AA BE[7F3E0100]        <1> 	mov	esi, msg_writing
  4058 0000C8AF E891ACFFFF          <1> 	call	print_msg
  4059                              <1> 
  4060 0000C8B4 BE[8B3E0100]        <1> 	mov	esi, percentagestr
  4061                              <1> 	;call	print_msg
  4062                              <1> 	;retn
  4063 0000C8B9 E987ACFFFF          <1> 	jmp	print_msg
  4064                              <1> 
  4065                              <1> csftdf2_save_fat_file_3:
  4066 0000C8BE 803D[8C8D0100]00    <1> 	cmp	byte [csftdf_percentage], 0
  4067 0000C8C5 7611                <1>         jna     csftdf2_save_fat_file_4 ; 25/03/2016
  4068                              <1> 
  4069                              <1> 	; "100%"
  4070 0000C8C7 BF[8B3E0100]        <1> 	mov	edi, percentagestr
  4071 0000C8CC B031                <1> 	mov	al, '1'
  4072 0000C8CE AA                  <1> 	stosb
  4073 0000C8CF B030                <1> 	mov	al, '0'
  4074 0000C8D1 AA                  <1> 	stosb
  4075 0000C8D2 AA                  <1> 	stosb
  4076                              <1> 
  4077 0000C8D3 E8BEFFFFFF          <1> 	call	csftdf2_print_wr_percentage
  4078                              <1> 
  4079                              <1> csftdf2_save_fat_file_4:
  4080 0000C8D8 803D[668D0100]00    <1> 	cmp	byte [DestinationFileFound], 0
  4081 0000C8DF 7647                <1> 	jna	short csftdf2_save_fat_file_6
  4082                              <1> 
  4083 0000C8E1 8B35[948D0100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 31/03/2016	
  4084                              <1> 
  4085 0000C8E7 A1[788D0100]        <1> 	mov	eax, [csftdf_df_cluster] ; last cluster
  4086 0000C8EC E865040000          <1> 	call	get_next_cluster
  4087 0000C8F1 7235                <1> 	jc	short csftdf2_save_fat_file_6 ; eocc! or disk error!
  4088                              <1> 
  4089 0000C8F3 A1[788D0100]        <1> 	mov	eax, [csftdf_df_cluster] ; last cluster
  4090                              <1> 	;xor	ecx, ecx
  4091                              <1> 	;mov	[FAT_ClusterCounter], ecx ; 0 ; reset
  4092                              <1> 	;dec	ecx ; 0FFFFFFFFh
  4093                              <1> 	;shr	ecx, 4 ; 28 bit ; 0FFFFFFFh
  4094 0000C8F8 B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh
  4095 0000C8FD E87E070000          <1> 	call	update_cluster
  4096 0000C902 7224                <1> 	jc	short csftdf2_save_fat_file_6 ; really last cluster!?
  4097                              <1> 
  4098 0000C904 A3[788D0100]        <1> 	mov	[csftdf_df_cluster], eax ; next cluster
  4099                              <1> 	
  4100                              <1> 	; byte [FAT_BuffValidData] = 2 
  4101 0000C909 E82F0A0000          <1> 	call	save_fat_buffer
  4102 0000C90E 730E                <1> 	jnc	short csftdf2_save_fat_file_5
  4103                              <1> 	
  4104 0000C910 8B15[688D0100]      <1> 	mov	edx, [csftdf_filesize]
  4105 0000C916 8915[2A8D0100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  4106 0000C91C EB58                <1> 	jmp	short csftdf2_save_fat_file_err3
  4107                              <1> 
  4108                              <1> csftdf2_save_fat_file_5:
  4109 0000C91E A1[788D0100]        <1> 	mov	eax, [csftdf_df_cluster]
  4110                              <1> 
  4111                              <1> 	; EAX = First cluster to be truncated/unlinked
  4112                              <1> 	; ESI = Logical dos drive description table address
  4113 0000C923 E8580C0000          <1> 	call	truncate_cluster_chain
  4114                              <1> 
  4115                              <1> csftdf2_save_fat_file_6:
  4116                              <1> 	; 28/03/2016
  4117 0000C928 BE[998C0100]        <1> 	mov	esi, SourceFile_DirEntry+DirEntry_Attr ; +11 to + 18
  4118 0000C92D BF[198D0100]        <1> 	mov	edi, DestinationFile_DirEntry+DirEntry_Attr ; +11 to + 18
  4119 0000C932 A4                  <1> 	movsb ; +11
  4120 0000C933 A5                  <1> 	movsd ; +12 .. +15
  4121 0000C934 66A5                <1> 	movsw ; +16 .. +17
  4122                              <1> 		; + 18
  4123 0000C936 83C604              <1> 	add	esi, 4
  4124 0000C939 83C704              <1> 	add	edi, 4
  4125 0000C93C A5                  <1> 	movsd	; DirEntry_WrtTime ; +22 .. +25
  4126                              <1> 
  4127 0000C93D 8B15[688D0100]      <1> 	mov	edx, [csftdf_filesize]
  4128 0000C943 8915[2A8D0100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  4129                              <1> 
  4130 0000C949 E8BAF0FFFF          <1> 	call	convert_current_date_time
  4131                              <1> 	; DX = Date in dos dir entry format
  4132                              <1> 	; AX = Time in dos dir entry format
  4133 0000C94E EB4D                <1> 	jmp	short csftdf2_save_fat_file_7
  4134                              <1> 
  4135                              <1> csftdf2_save_fat_file_err1:
  4136 0000C950 5B                  <1> 	pop	ebx ; *	
  4137                              <1> csftdf2_save_fat_file_err2:
  4138 0000C951 A1[888D0100]        <1> 	mov	eax, [csftdf_df_wbytes]
  4139 0000C956 8B15[2A8D0100]      <1> 	mov	edx, [DestinationFile_DirEntry+DirEntry_FileSize]
  4140 0000C95C 39C2                <1> 	cmp	edx, eax
  4141 0000C95E 7616                <1> 	jna	short csftdf2_save_fat_file_err3
  4142 0000C960 A1[788D0100]        <1> 	mov	eax, [csftdf_df_cluster] ; last (empty) cluster
  4143                              <1> 	; ESI = Logical dos drive description table address
  4144 0000C965 E8160C0000          <1> 	call	truncate_cluster_chain
  4145 0000C96A 720A                <1> 	jc	short csftdf2_save_fat_file_err3
  4146 0000C96C A1[888D0100]        <1> 	mov	eax, [csftdf_df_wbytes]	
  4147 0000C971 A3[2A8D0100]        <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], eax
  4148                              <1> csftdf2_save_fat_file_err3:
  4149 0000C976 E88DF0FFFF          <1> 	call	convert_current_date_time
  4150                              <1> 	; DX = Date in dos dir entry format
  4151                              <1> 	; AX = Time in dos dir entry format
  4152 0000C97B C605[1B8D0100]00    <1> 	mov	byte [DestinationFile_DirEntry+DirEntry_CrtTimeTenth], 0
  4153 0000C982 66A3[1C8D0100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_CrtTime], ax
  4154 0000C988 668915[1E8D0100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_CrtDate], dx		
  4155 0000C98F 66A3[248D0100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_WrtTime], ax
  4156 0000C995 668915[268D0100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_WrtDate], dx
  4157 0000C99C F9                  <1> 	stc
  4158                              <1> csftdf2_save_fat_file_7:
  4159 0000C99D 9C                  <1> 	pushf
  4160 0000C99E 668915[208D0100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_LastAccDate], dx
  4161 0000C9A5 BE[0E8D0100]        <1> 	mov	esi, DestinationFile_DirEntry
  4162 0000C9AA BF00000800          <1> 	mov	edi, Directory_Buffer
  4163 0000C9AF 0FB70D[368D0100]    <1> 	movzx	ecx, word [DestinationFile_DirEntryNumber] ; (<2048)
  4164 0000C9B6 66C1E105            <1> 	shl	cx, 5 ; 32 * directory entry number
  4165 0000C9BA 01CF                <1> 	add	edi, ecx
  4166                              <1> 	;mov	ecx, 8
  4167 0000C9BC 66B90800            <1> 	mov	cx, 8
  4168 0000C9C0 F3A5                <1> 	rep	movsd
  4169 0000C9C2 9D                  <1> 	popf
  4170 0000C9C3 730B                <1> 	jnc	short csftdf2_write_file_OK
  4171                              <1> 	 		
  4172                              <1> csftdf2_write_error:
  4173                              <1> 	; 18/03/2016
  4174 0000C9C5 B01D                <1> 	mov	al, 1Dh ; write error
  4175 0000C9C7 EB02                <1> 	jmp	short csftdf2_rw_error
  4176                              <1> 
  4177                              <1> 	; 16/03/2016
  4178                              <1> csftdf2_read_error:
  4179 0000C9C9 B011                <1> 	mov	al, 17 ; ; Drive not ready or read error!
  4180                              <1> csftdf2_rw_error:
  4181 0000C9CB A2[658D0100]        <1> 	mov	[csftdf_rw_err], al 
  4182                              <1> 
  4183                              <1> csftdf2_write_file_OK:
  4184                              <1> 	; 18/03/2016
  4185 0000C9D0 C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  4186 0000C9D7 E8CAF0FFFF          <1> 	call	save_directory_buffer
  4187                              <1> 
  4188                              <1>  	; Update last modification date&time of destination
  4189                              <1> 	; file's (parent) directory
  4190 0000C9DC E860F1FFFF          <1> 	call	update_parent_dir_lmdt
  4191                              <1> 	;
  4192 0000C9E1 A1[6C8D0100]        <1> 	mov	eax, [csftdf_sf_mem_addr] ; start address
  4193                              <1> 
  4194 0000C9E6 21C0                <1> 	and	eax, eax
  4195 0000C9E8 750E                <1> 	jnz	short csftdf2_dealloc_mblock
  4196                              <1> 
  4197 0000C9EA 88C5                <1> 	mov	ch, al ; 0 (Cluster r/w, not full loading)
  4198                              <1> csftdf2_dealloc_retn:
  4199 0000C9EC 8A0D[658D0100]      <1> 	mov	cl, [csftdf_rw_err]
  4200 0000C9F2 A1[788D0100]        <1> 	mov	eax, [csftdf_df_cluster]
  4201 0000C9F7 C3                  <1> 	retn
  4202                              <1> 
  4203                              <1> csftdf2_dealloc_mblock:
  4204 0000C9F8 8B0D[708D0100]      <1> 	mov	ecx, [csftdf_sf_mem_bsize] ; block size	
  4205 0000C9FE E87D9CFFFF          <1> 	call	deallocate_memory_block
  4206 0000CA03 B5FF                <1>         mov     ch, 0FFh ; (File was full loaded at memory)
  4207 0000CA05 EBE5                <1> 	jmp	short csftdf2_dealloc_retn
  4208                              <1> 
  4209                              <1> csftdf2_save_fs_file:
  4210                              <1> 	; 16/10/2016 (1Dh -> 18)
  4211                              <1> 	; temporary - (21/03/2016)
  4212 0000CA07 B812000000          <1> 	mov	eax, 18 ; write error
  4213 0000CA0C F9                  <1> 	stc
  4214 0000CA0D C3                  <1> 	retn
  4215                              <1> 
  4216                              <1> create_file:
  4217                              <1> 	; 16/10/2016
  4218                              <1> 	; 24/03/2016, 31/03/2016
  4219                              <1> 	; 20/03/2016, 21/03/2016, 23/03/2016
  4220                              <1> 	; 19/03/2016 (TRDOS 396 = TRDOS v2.0)
  4221                              <1> 	; 03/09/2011 (FILE.ASM, 'proc_create_file')
  4222                              <1> 	; 09/08/2010
  4223                              <1> 	;
  4224                              <1> 	; INPUT ->
  4225                              <1> 	; 	EAX = File Size
  4226                              <1> 	; 	ESI = ASCIIZ File Name
  4227                              <1> 	; 	CL = File Attributes 
  4228                              <1> 	;	EBX = FFFFFFFFh -> create empty file 
  4229                              <1> 	;			 (only for FAT fs) 
  4230                              <1> 	; OUTPUT ->
  4231                              <1> 	;     CF = 0 ->
  4232                              <1> 	;	EAX = New file's first cluster
  4233                              <1> 	; 	ESI = Logical Dos Drv Descr. Table Addr.
  4234                              <1> 	; 	EBX = offset CreateFile_Size
  4235                              <1> 	; 	ECX = Sectors per cluster (<256) 
  4236                              <1> 	; 	EDX = Directory entry index/number (<65536)
  4237                              <1> 	;     CF = 1 -> error code in AL
  4238                              <1> 
  4239                              <1> ;	test	cl, 18h (directory or volume name)
  4240                              <1> ;	jnz	short loc_createfile_access_denied
  4241 0000CA0E 80E107              <1> 	and	cl, 07h ; S, H, R
  4242 0000CA11 880D[B48D0100]      <1>         mov     [createfile_attrib], cl 
  4243                              <1> 
  4244 0000CA17 89D9                <1> 	mov	ecx, ebx
  4245 0000CA19 89F3                <1> 	mov	ebx, esi ; ASCIIZ File Name address
  4246 0000CA1B 29D2                <1> 	sub	edx, edx
  4247 0000CA1D 8A35[56820100]      <1>         mov     dh, [Current_Drv]
  4248 0000CA23 BE00010900          <1>         mov     esi, Logical_DOSDisks
  4249 0000CA28 01D6                <1> 	add	esi, edx
  4250                              <1> 
  4251 0000CA2A 8815[BF8D0100]      <1> 	mov	[createfile_UpdatePDir], dl ; 0 ; 31/03/2016 
  4252                              <1> 
  4253                              <1> 	; LD_DiskType = 0 for write protection (read only) 
  4254 0000CA30 807E0101            <1> 	cmp	byte [esi+LD_DiskType], 1 ; 0 = Invalid
  4255 0000CA34 730A                <1> 	jnb	short loc_createfile_check_file_sytem
  4256                              <1> 	; 16/10/2016 (TRDOS Error code: 30, disk write protected) 
  4257 0000CA36 B81E000000          <1> 	mov	eax, 30 ; 13h, MSDOS err : Disk write-protected 
  4258 0000CA3B 66BA0000            <1> 	mov	dx, 0
  4259                              <1> 	; err retn: EDX = 0, EBX = File name offset
  4260                              <1> 	; ESI -> Dos drive description table address	
  4261 0000CA3F C3                  <1> 	retn
  4262                              <1> 
  4263                              <1> ;loc_createfile_access_denied:
  4264                              <1> ;	mov	eax, 05h ; access denied (invalid attributes input)
  4265                              <1> ;	stc
  4266                              <1> ;	retn
  4267                              <1> 
  4268                              <1> loc_createfile_check_file_sytem:
  4269 0000CA40 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  4270 0000CA44 730A                <1> 	jnb	short loc_createfile_chk_empty_FAT_file_sign1
  4271                              <1> 
  4272 0000CA46 A3[A08D0100]        <1> 	mov	[createfile_size], eax
  4273                              <1> 	; ESI = Logical Dos Drive Description Table address
  4274                              <1> 	; EBX = ASCIIZ File Name address
  4275 0000CA4B E9FE020000          <1> 	jmp	create_fs_file
  4276                              <1> 
  4277                              <1> loc_createfile_chk_empty_FAT_file_sign1:
  4278                              <1> 	; ECX = FFFFFFFFh -> create empty file if drive has FAT fs
  4279 0000CA50 41                  <1> 	inc	ecx
  4280 0000CA51 7506                <1> 	jnz	short loc_createfile_chk_empty_FAT_file_sign2
  4281 0000CA53 890D[A08D0100]      <1> 	mov	[createfile_size], ecx ; 0 ; empty file
  4282                              <1> 
  4283                              <1> loc_createfile_chk_empty_FAT_file_sign2:
  4284                              <1> 	; 23/03/2016
  4285 0000CA59 668B4E11            <1> 	mov	cx, [esi+LD_BPB+BytesPerSec]
  4286 0000CA5D 66890D[BC8D0100]    <1> 	mov	[createfile_BytesPerSec], cx
  4287                              <1> 	
  4288                              <1> 	; EBX = ASCIIZ File Name address
  4289 0000CA64 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
  4290 0000CA68 8815[B58D0100]      <1> 	mov	[createfile_SecPerClust], dl
  4291 0000CA6E 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  4292 0000CA71 39D1                <1> 	cmp	ecx, edx ; byte [createfile_SecPerClust]
  4293 0000CA73 7306                <1> 	jnb	short loc_create_fat_file
  4294                              <1> 	  
  4295                              <1> loc_createfile_insufficient_disk_space:
  4296 0000CA75 B827000000          <1> 	mov	eax, 27h
  4297                              <1> loc_createfile_gffc_retn:
  4298 0000CA7A C3                  <1> 	retn
  4299                              <1> 
  4300                              <1> loc_create_fat_file:
  4301 0000CA7B 891D[988D0100]      <1> 	mov	[createfile_Name_Offset], ebx
  4302 0000CA81 890D[9C8D0100]      <1> 	mov	[createfile_FreeSectors], ecx
  4303                              <1> 
  4304                              <1> loc_createfile_gffc_1:
  4305 0000CA87 E821050000          <1> 	call	get_first_free_cluster
  4306 0000CA8C 72EC                <1> 	jc	short loc_createfile_gffc_retn
  4307                              <1> 
  4308 0000CA8E A3[A48D0100]        <1> 	mov	[createfile_FFCluster], eax
  4309                              <1> 
  4310                              <1> loc_createfile_locate_ffe_on_directory:
  4311                              <1> 	; Current directory fcluster <> Directory buffer cluster
  4312                              <1> 	; Current directory will be reloaded by
  4313                              <1> 	; 'locate_current_dir_file' procedure
  4314                              <1> 	;
  4315                              <1> 	; ESI = Logical Dos Drv Desc. Table Adress
  4316 0000CA93 56                  <1> 	push	esi ; *
  4317 0000CA94 31C0                <1> 	xor	eax, eax
  4318                              <1> 
  4319 0000CA96 A3[72890100]        <1> 	mov	dword [FAT_ClusterCounter], eax ; 0
  4320                              <1> 	; 21/03/2016
  4321 0000CA9B A2[BE8D0100]        <1> 	mov	byte [createfile_wfc], al ; 0 
  4322                              <1> 
  4323 0000CAA0 89C1                <1>  	mov	ecx, eax
  4324 0000CAA2 6649                <1> 	dec	cx ; FFFFh  
  4325                              <1> 	; CX = FFFFh -> find first deleted or free entry
  4326                              <1> 	; ESI would be ASCIIZ filename address if the call
  4327                              <1> 	; would not be for first free or deleted dir entry  
  4328 0000CAA4 E8D7E7FFFF          <1> 	call	locate_current_dir_file
  4329 0000CAA9 0F83EE000000        <1> 	jnc	loc_createfile_set_ff_dir_entry
  4330 0000CAAF 5E                  <1> 	pop	esi ; *
  4331                              <1> 	 ; ESI = Logical DOS Drv. Description Table Address 
  4332 0000CAB0 83F802              <1> 	cmp	eax, 2
  4333 0000CAB3 7402                <1> 	je	short loc_createfile_add_new_cluster
  4334                              <1> loc_createfile_locate_file_stc_retn:
  4335 0000CAB5 F9                  <1> 	stc
  4336 0000CAB6 C3                  <1> 	retn
  4337                              <1> 
  4338                              <1> loc_createfile_add_new_cluster:
  4339 0000CAB7 803D[55820100]02    <1> 	cmp	byte [Current_FATType], 2
  4340                              <1> 	;cmp	byte [esi+LD_FATType], 2
  4341 0000CABE 770C                <1> 	ja	short loc_createfile_add_new_cluster_check_fsc
  4342 0000CAC0 803D[54820100]01    <1> 	cmp	byte [Current_Dir_Level], 1
  4343                              <1> 	;cmp	byte [esi+LD_CDirLevel], 1
  4344 0000CAC7 7303                <1> 	jnb	short loc_createfile_add_new_cluster_check_fsc
  4345                              <1> 	
  4346                              <1> 	;mov	eax, 12
  4347 0000CAC9 B00C                <1> 	mov	al, 12 ; No more files 
  4348                              <1> 
  4349                              <1> loc_createfile_anc_retn:
  4350 0000CACB C3                  <1> 	retn
  4351                              <1> 
  4352                              <1> loc_createfile_add_new_cluster_check_fsc:
  4353 0000CACC 8B0D[9C8D0100]      <1> 	mov	ecx, [createfile_FreeSectors]
  4354 0000CAD2 0FB605[B58D0100]    <1> 	movzx	eax, byte [createfile_SecPerClust]
  4355 0000CAD9 66D1E0              <1> 	shl	ax, 1 ; AX = 2 * AX
  4356 0000CADC 39C1                <1> 	cmp	ecx, eax
  4357 0000CADE 7295                <1>         jb	short loc_createfile_insufficient_disk_space
  4358                              <1> 
  4359                              <1> loc_createfile_add_new_subdir_cluster:
  4360 0000CAE0 8B15[81890100]      <1> 	mov	edx, [DirBuff_Cluster]
  4361 0000CAE6 8915[A88D0100]      <1> 	mov	[createfile_LastDirCluster], edx	
  4362                              <1> 
  4363 0000CAEC A1[A48D0100]        <1> 	mov	eax, [createfile_FFCluster]
  4364 0000CAF1 E846040000          <1> 	call	load_FAT_sub_directory 
  4365 0000CAF6 72D3                <1> 	jc	short loc_createfile_anc_retn
  4366                              <1> 
  4367                              <1> pass_createfile_add_new_subdir_cluster:
  4368                              <1> 	;movzx	eax, word [esi+LD_BPB+BytesPerSec]
  4369 0000CAF8 0FB705[BC8D0100]    <1> 	movzx	eax, word [createfile_BytesPerSec] ; 23/03/2016
  4370 0000CAFF F7E1                <1> 	mul	ecx ; ecx = directory buffer sector count
  4371 0000CB01 89C1                <1> 	mov	ecx, eax
  4372 0000CB03 C1E902              <1> 	shr	ecx, 2 ; dword count
  4373 0000CB06 29C0                <1> 	sub	eax, eax ; 0
  4374 0000CB08 F3AB                <1> 	rep	stosd 
  4375                              <1> 	;
  4376 0000CB0A C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  4377 0000CB11 E890EFFFFF          <1> 	call	save_directory_buffer
  4378 0000CB16 72B3                <1> 	jc	short loc_createfile_anc_retn
  4379                              <1> 
  4380                              <1> loc_createfile_save_added_subdir_cluster:
  4381 0000CB18 A1[A88D0100]        <1> 	mov	eax, [createfile_LastDirCluster]
  4382 0000CB1D 8B0D[A48D0100]      <1> 	mov	ecx, [createfile_FFCluster]
  4383 0000CB23 E858050000          <1> 	call	update_cluster
  4384 0000CB28 7304                <1> 	jnc	short loc_createfile_save_fat_buffer_0
  4385 0000CB2A 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4386 0000CB2C 751A                <1> 	jnz	short loc_createfile_save_fat_buffer_stc_retn
  4387                              <1> 
  4388                              <1> loc_createfile_save_fat_buffer_0:
  4389 0000CB2E A1[A48D0100]        <1> 	mov	eax, [createfile_FFCluster]
  4390 0000CB33 A3[A88D0100]        <1> 	mov	[createfile_LastDirCluster], eax
  4391 0000CB38 B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh ; 28 bit
  4392 0000CB3D E83E050000          <1> 	call	update_cluster
  4393 0000CB42 7306                <1> 	jnc	short loc_createfile_save_fat_buffer_1
  4394 0000CB44 09C0                <1> 	or	eax, eax ; Was it free cluster
  4395 0000CB46 7402                <1> 	jz	short loc_createfile_save_fat_buffer_1
  4396                              <1> 
  4397                              <1> loc_createfile_save_fat_buffer_stc_retn:
  4398 0000CB48 F9                  <1> 	stc
  4399                              <1> loc_createfile_save_fat_buffer_retn:
  4400                              <1> loc_createfile_gffc_2_stc_retn:
  4401 0000CB49 C3                  <1> 	retn
  4402                              <1> 
  4403                              <1> loc_createfile_save_fat_buffer_1:
  4404                              <1> 	; byte [FAT_BuffValidData] = 2 
  4405 0000CB4A E8EE070000          <1> 	call	save_fat_buffer
  4406 0000CB4F 72F8                <1> 	jc	short loc_createfile_save_fat_buffer_retn
  4407                              <1> 
  4408 0000CB51 803D[72890100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  4409 0000CB58 7222                <1> 	jb	short loc_createfile_save_fat_buffer_2
  4410                              <1> 
  4411                              <1> 	; ESI = Logical DOS Drive Description Table address 
  4412 0000CB5A A1[72890100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4413                              <1> 
  4414 0000CB5F C605[72890100]00    <1> 	mov	byte [FAT_ClusterCounter], 0 ; 21/03/2016
  4415                              <1> 
  4416 0000CB66 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  4417 0000CB6A E863080000          <1> 	call	calculate_fat_freespace
  4418                              <1> 
  4419                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  4420                              <1> 	;jnz	short loc_createfile_save_fat_buffer_2
  4421                              <1> 
  4422                              <1> 	; ecx > 0 -> Recalculation is needed
  4423 0000CB6F 09C9                <1> 	or	ecx, ecx 
  4424 0000CB71 7409                <1> 	jz	short loc_createfile_save_fat_buffer_2
  4425                              <1> 
  4426 0000CB73 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  4427 0000CB77 E856080000          <1> 	call	calculate_fat_freespace
  4428                              <1> 
  4429                              <1> loc_createfile_save_fat_buffer_2:
  4430                              <1> 	;call	update_parent_dir_lmdt
  4431                              <1> 
  4432                              <1> loc_createfile_gffc_2:
  4433 0000CB7C E82C040000          <1> 	call	get_first_free_cluster
  4434 0000CB81 72C6                <1> 	jc	short loc_createfile_gffc_2_stc_retn
  4435                              <1> 
  4436 0000CB83 A3[A48D0100]        <1> 	mov	[createfile_FFCluster], eax
  4437                              <1> 
  4438 0000CB88 A1[A88D0100]        <1> 	mov	eax, [createfile_LastDirCluster]
  4439                              <1> 	
  4440 0000CB8D E8AA030000          <1> 	call	load_FAT_sub_directory 
  4441 0000CB92 72B5                <1> 	jc	short loc_createfile_gffc_2_stc_retn
  4442                              <1> 
  4443 0000CB94 BF00000800          <1> 	mov	edi, Directory_Buffer
  4444                              <1> 
  4445 0000CB99 6629DB              <1> 	sub	bx, bx ; directory entry index/number = 0
  4446                              <1> 
  4447 0000CB9C 56                  <1> 	push	esi ; * ; 23/03/2016
  4448                              <1> 
  4449                              <1> loc_createfile_set_ff_dir_entry:
  4450 0000CB9D 66891D[B68D0100]    <1> 	mov	[createfile_DirIndex], bx
  4451                              <1> 
  4452                              <1>         ; EDI = Directory entry address
  4453 0000CBA4 8B35[988D0100]      <1> 	mov	esi, [createfile_Name_Offset]
  4454 0000CBAA A1[A48D0100]        <1> 	mov	eax, [createfile_FFCluster]
  4455 0000CBAF A3[AC8D0100]        <1> 	mov	[createfile_Cluster], eax ; 24/03/2016
  4456 0000CBB4 B5FF                <1> 	mov	ch, 0FFh
  4457 0000CBB6 8A0D[B48D0100]      <1>         mov	cl, [createfile_attrib] ; file attributes
  4458                              <1> 	; CH > 0 -> File size is in [EBX]
  4459 0000CBBC BB[A08D0100]        <1> 	mov	ebx, createfile_size
  4460                              <1>   
  4461 0000CBC1 E803EEFFFF          <1> 	call	make_directory_entry
  4462                              <1> 	
  4463 0000CBC6 5E                  <1> 	pop	esi ; * ; ESI = Logical Dos Drv Desc. Table address
  4464                              <1> 
  4465 0000CBC7 C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  4466 0000CBCE E8D3EEFFFF          <1> 	call	save_directory_buffer
  4467 0000CBD3 7221                <1> 	jc	short loc_createfile_set_ff_dir_entry_retn
  4468                              <1> 
  4469 0000CBD5 C605[BF8D0100]01    <1> 	mov	byte [createfile_UpdatePDir], 1 ; 31/03/2016 
  4470                              <1> 
  4471                              <1> loc_createfile_get_set_write_file_cluster:
  4472 0000CBDC A1[A08D0100]        <1> 	mov	eax, [createfile_size]
  4473 0000CBE1 09C0                <1> 	or	eax, eax
  4474 0000CBE3 7570                <1> 	jnz	short loc_createfile_get_set_wfc_cont
  4475 0000CBE5 40                  <1> 	inc	eax
  4476                              <1> 	; 23/03/2016
  4477 0000CBE6 0FB61D[B58D0100]    <1> 	movzx	ebx, byte [createfile_SecPerClust]
  4478                              <1> 	;movzx	ecx, word [esi+LD_BPB+BytesPerSec] ; 512
  4479 0000CBED 0FB70D[BC8D0100]    <1>         movzx   ecx, word [createfile_BytesPerSec] ; 512
  4480 0000CBF4 EB7C                <1> 	jmp	loc_createfile_set_cluster_count 
  4481                              <1> 
  4482                              <1> loc_createfile_set_ff_dir_entry_retn:
  4483 0000CBF6 C3                  <1> 	retn
  4484                              <1> 
  4485                              <1> loc_createfile_write_fcluster_to_disk:
  4486 0000CBF7 034668              <1> 	add	eax, [esi+LD_DATABegin] ; convert to physical address
  4487 0000CBFA BB00000700          <1> 	mov	ebx, Cluster_Buffer
  4488                              <1> 	; ESI = Logical DOS Drv. Desc. Tbl. address
  4489                              <1> 	; EAX = Disk address
  4490                              <1> 	; EBX = Sector Buffer
  4491                              <1> 	; ECX = sectors per cluster
  4492 0000CBFF E80A570000          <1> 	call	disk_write
  4493 0000CC04 7211                <1> 	jc	short loc_createfile_dsk_wr_err
  4494                              <1> 
  4495                              <1> loc_createfile_update_fat_cluster:
  4496                              <1> 	; 21/03/2016	
  4497 0000CC06 803D[BE8D0100]00    <1> 	cmp	byte [createfile_wfc], 0 
  4498 0000CC0D 7712                <1> 	ja	short loc_createfile_update_fat_cluster_n1
  4499                              <1> 
  4500 0000CC0F FE05[BE8D0100]      <1> 	inc	byte [createfile_wfc] ; 1
  4501 0000CC15 EB24                <1> 	jmp	short loc_createfile_update_fat_cluster_n2
  4502                              <1> 
  4503                              <1> loc_createfile_dsk_wr_err:
  4504                              <1> 	; 16/10/2016 (1Dh -> 18)
  4505                              <1> 	; 23/03/2016
  4506 0000CC17 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error !
  4507 0000CC1C E9BD000000          <1> 	jmp	loc_createfile_stc_retn
  4508                              <1> 
  4509                              <1> loc_createfile_update_fat_cluster_n1:
  4510 0000CC21 A1[B08D0100]        <1> 	mov	eax, [createfile_PCluster]
  4511 0000CC26 8B0D[AC8D0100]      <1> 	mov	ecx, [createfile_Cluster]
  4512 0000CC2C E84F040000          <1> 	call	update_cluster
  4513 0000CC31 7308                <1> 	jnc	short loc_createfile_update_fat_cluster_n2
  4514 0000CC33 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4515 0000CC35 0F85A3000000        <1> 	jnz	loc_createfile_stc_retn
  4516                              <1> 
  4517                              <1> loc_createfile_update_fat_cluster_n2:
  4518 0000CC3B A1[AC8D0100]        <1>         mov	eax, [createfile_Cluster]
  4519 0000CC40 B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh
  4520 0000CC45 E836040000          <1> 	call	update_cluster
  4521 0000CC4A 734E                <1> 	jnc	short loc_createfile_save_fat_buffer_3
  4522 0000CC4C 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4523 0000CC4E 744A                <1> 	jz	short loc_createfile_save_fat_buffer_3
  4524                              <1> 
  4525                              <1> loc_createfile_upd_fat_fcluster_stc_retn:
  4526 0000CC50 E989000000          <1> 	jmp	loc_createfile_stc_retn
  4527                              <1> 
  4528                              <1> loc_createfile_get_set_wfc_cont:
  4529                              <1> 	;movzx	ecx, word [esi+LD_BPB+BytesPerSec] ; 512	
  4530 0000CC55 0FB70D[BC8D0100]    <1> 	movzx	ecx, word [createfile_BytesPerSec] ; 512
  4531 0000CC5C 01C8                <1> 	add	eax, ecx
  4532 0000CC5E 48                  <1> 	dec	eax  ; add eax, 511
  4533 0000CC5F 29D2                <1> 	sub	edx, edx
  4534 0000CC61 F7F1                <1> 	div	ecx
  4535 0000CC63 0FB61D[B58D0100]    <1> 	movzx	ebx, byte [createfile_SecPerClust]
  4536 0000CC6A 01D8                <1> 	add	eax, ebx
  4537 0000CC6C 48                  <1> 	dec	eax  ; add eax, SecPerClust - 1
  4538 0000CC6D 6631D2              <1> 	xor	dx, dx
  4539 0000CC70 F7F3                <1> 	div	ebx
  4540                              <1> 
  4541                              <1> loc_createfile_set_cluster_count:
  4542 0000CC72 A3[B88D0100]        <1> 	mov 	[createfile_CCount], eax
  4543                              <1> 	
  4544 0000CC77 BF00000700          <1> 	mov	edi, Cluster_Buffer
  4545 0000CC7C 89C8                <1> 	mov	eax, ecx ; Bytes per Sector
  4546 0000CC7E F7E3                <1> 	mul	ebx ; Sectors per Cluster 
  4547                              <1> 	; EAX = Bytes per Cluster
  4548 0000CC80 89C1                <1> 	mov	ecx, eax
  4549 0000CC82 C1E902              <1> 	shr	ecx, 2 ; dword count
  4550 0000CC85 31C0                <1> 	xor	eax, eax
  4551 0000CC87 F3AB                <1> 	rep	stosd ; clear cluster buffer
  4552                              <1> 
  4553 0000CC89 A1[AC8D0100]        <1> 	mov	eax, [createfile_Cluster] ; 24/03/2016
  4554                              <1> 
  4555 0000CC8E 89D9                <1> 	mov	ecx, ebx
  4556                              <1> 
  4557                              <1> loc_createfile_get_set_wf_fclust_cont:
  4558 0000CC90 83E802              <1> 	sub	eax, 2
  4559 0000CC93 F7E1                <1> 	mul	ecx
  4560                              <1> 	; EAX = Logical DOS disk address (offset)
  4561 0000CC95 E95DFFFFFF          <1>         jmp     loc_createfile_write_fcluster_to_disk
  4562                              <1> 
  4563                              <1> loc_createfile_save_fat_buffer_3:
  4564                              <1> 	; byte [FAT_BuffValidData] = 2
  4565 0000CC9A E89E060000          <1> 	call	save_fat_buffer
  4566 0000CC9F 723D                <1> 	jc	loc_createfile_stc_retn
  4567                              <1> 
  4568                              <1> 	; 21/03/2016
  4569 0000CCA1 803D[72890100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  4570 0000CCA8 721B                <1> 	jb	short loc_createfile_save_fat_buffer_4
  4571                              <1> 
  4572                              <1> 	; ESI = Logical DOS Drive Description Table address 
  4573 0000CCAA A1[72890100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4574 0000CCAF 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  4575 0000CCB3 E81A070000          <1> 	call	calculate_fat_freespace
  4576                              <1> 
  4577                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  4578                              <1> 	;jnz	short loc_createfile_save_fat_buffer_4
  4579                              <1> 
  4580                              <1> 	; ecx > 0 -> Recalculation is needed
  4581 0000CCB8 09C9                <1> 	or	ecx, ecx 
  4582 0000CCBA 7409                <1> 	jz	short loc_createfile_save_fat_buffer_4
  4583                              <1> 
  4584 0000CCBC 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  4585 0000CCC0 E80D070000          <1> 	call	calculate_fat_freespace
  4586                              <1> 
  4587                              <1> loc_createfile_save_fat_buffer_4:
  4588 0000CCC5 FF0D[B88D0100]      <1> 	dec	dword [createfile_CCount]
  4589                              <1> 	;jz	short loc_createfile_upd_dir_modif_date_time
  4590 0000CCCB 743F                <1> 	jz	short loc_createfile_stc_retn_cc ; 31/03/2016
  4591                              <1> 
  4592                              <1> loc_createfile_get_set_write_next_cluster:
  4593 0000CCCD E8DB020000          <1> 	call	get_first_free_cluster
  4594 0000CCD2 720A                <1> 	jc	short loc_createfile_stc_retn
  4595                              <1> 
  4596                              <1> loc_createfile_get_set_write_next_cluster_1:
  4597 0000CCD4 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh
  4598 0000CCD7 7213                <1> 	jb	short loc_createfile_get_set_write_next_cluster_2
  4599                              <1> 
  4600                              <1> loc_createfile_wnc_insufficient_disk_space:	
  4601 0000CCD9 B827000000          <1> 	mov	eax, 27h ; Insufficient disk space
  4602                              <1> 
  4603                              <1> loc_createfile_stc_retn:
  4604 0000CCDE 803D[BE8D0100]01    <1> 	cmp	byte [createfile_wfc], 1
  4605 0000CCE5 7324                <1> 	jnb	short loc_createfile_err_retn
  4606 0000CCE7 C3                  <1> 	retn
  4607                              <1> 
  4608                              <1> loc_createfile_wnc_inv_format_retn:
  4609                              <1> 	;mov	eax, 28
  4610 0000CCE8 B01C                <1> 	mov	al, 28 ; Invalid format
  4611 0000CCEA EBF2                <1> 	jmp	short loc_createfile_stc_retn
  4612                              <1> 	         
  4613                              <1> loc_createfile_get_set_write_next_cluster_2:
  4614 0000CCEC 83F802              <1> 	cmp	eax, 2
  4615 0000CCEF 72F7                <1> 	jb	short loc_createfile_wnc_inv_format_retn
  4616                              <1> 
  4617                              <1> loc_createfile_get_set_write_next_cluster_3:
  4618 0000CCF1 8B0D[AC8D0100]      <1> 	mov	ecx, [createfile_Cluster]
  4619 0000CCF7 A3[AC8D0100]        <1> 	mov	[createfile_Cluster], eax
  4620 0000CCFC 890D[B08D0100]      <1> 	mov	[createfile_PCluster], ecx
  4621 0000CD02 0FB60D[B58D0100]    <1> 	movzx	ecx, byte [createfile_SecPerClust]
  4622 0000CD09 EB85                <1> 	jmp	short loc_createfile_get_set_wf_fclust_cont
  4623                              <1> 
  4624                              <1> loc_createfile_err_retn:
  4625 0000CD0B F9                  <1> 	stc
  4626                              <1> 
  4627                              <1> ;loc_createfile_upd_dir_modif_date_time:
  4628                              <1> loc_createfile_stc_retn_cc: ; 31/03/2016
  4629 0000CD0C 9C                  <1> 	pushf	; cpu is here for an error return or completion 
  4630 0000CD0D 50                  <1> 	push	eax ; error code if cf = 1
  4631                              <1> 
  4632                              <1> 	;call	update_parent_dir_lmdt
  4633                              <1> 
  4634                              <1> ;loc_createfile_stc_retn_cc:
  4635 0000CD0E A1[72890100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4636 0000CD13 09C0                <1> 	or	eax, eax
  4637 0000CD15 741A                <1> 	jz	short loc_createfile_stc_retn_pop_eax
  4638 0000CD17 8A3D[56820100]      <1> 	mov	bh, [Current_Drv]
  4639 0000CD1D B301                <1> 	mov	bl, 01h ; BL = 1 -> add clusters
  4640                              <1> 	; NOTE: EAX value will be added to Free Cluster Count
  4641                              <1> 	; (If EAX value is negative, Free Cluster Count will be decreased)
  4642 0000CD1F E8AE060000          <1>   	call	calculate_fat_freespace
  4643                              <1>         ; ESI = Logical DOS Drive Description Table Address 
  4644                              <1>         ;jc	short loc_createfile_stc_retn_pop_eax_cf
  4645 0000CD24 21C9                <1> 	and	ecx, ecx ; cx = 0 -> valid free sector count
  4646 0000CD26 7409                <1> 	jz	short loc_createfile_stc_retn_pop_eax
  4647                              <1> 
  4648                              <1> loc_createfile_stc_retn_recalc_FAT_freespace:
  4649 0000CD28 66BB00FF            <1> 	mov	bx, 0FF00h ; bh = 0FFh -> 
  4650                              <1> 	; ESI = Logical DOS Drv DT Addr
  4651                              <1> 	; BL = 0 -> Recalculate 
  4652 0000CD2C E8A1060000          <1> 	call	calculate_fat_freespace
  4653                              <1> 
  4654                              <1> loc_createfile_stc_retn_pop_eax:
  4655 0000CD31 58                  <1> 	pop	eax
  4656 0000CD32 9D                  <1> 	popf
  4657 0000CD33 7218                <1> 	jc	short loc_createfile_retn
  4658                              <1> 
  4659                              <1> loc_createfile_retn_fcluster:
  4660 0000CD35 A1[A48D0100]        <1> 	mov	eax, [createfile_FFCluster]
  4661 0000CD3A BB[A08D0100]        <1> 	mov	ebx, createfile_size
  4662                              <1> 	;movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  4663 0000CD3F 0FB60D[B58D0100]    <1> 	movzx	ecx, byte [createfile_SecPerClust] ; 23/03/2016
  4664 0000CD46 0FB715[B68D0100]    <1> 	movzx	edx, word [createfile_DirIndex]
  4665                              <1> 
  4666                              <1> loc_createfile_retn:
  4667 0000CD4D C3                  <1> 	retn
  4668                              <1> 
  4669                              <1> create_fs_file:
  4670                              <1> 	; temporary (21/03/2016)
  4671 0000CD4E C3                  <1> 	retn
  4672                              <1> 
  4673                              <1> delete_fs_file:
  4674                              <1> 	; temporary (28/02/2016)
  4675 0000CD4F C3                  <1> 	retn
  4676                              <1> 
  4677                              <1> rename_fs_file_or_directory:
  4678 0000CD50 C3                  <1> 	retn
  4679                              <1> 
  4680                              <1> make_fs_directory:
  4681                              <1> 	; temporary (21/02/2016)
  4682 0000CD51 C3                  <1> 	retn
  4683                              <1> 
  4684                              <1> add_new_fs_section:
  4685                              <1> 	; temporary (11/03/2016)
  4686 0000CD52 C3                  <1> 	retn
  4687                              <1> 
  4688                              <1> delete_fs_directory_entry:
  4689                              <1> 	; temporary (11/03/2016)
  4690 0000CD53 C3                  <1> 	retn
  4691                              <1> 
  4692                              <1> csftdf2_read_fs_file_sectors:
  4693                              <1> 	; temporary (19/03/2016)
  4694 0000CD54 C3                  <1> 	retn
  4695                              <1> 
  4696                              <1> csftdf2_write_fs_file_sectors:
  4697                              <1> 	; temporary (19/03/2016)
  4698 0000CD55 C3                  <1> 	retn
  3083                                  %include 'trdosk5.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - File System Procedures : trdosk5s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 23/10/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; DRV_FAT.ASM (21/08/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; DRV_FAT.ASM (c) 2005-2011 Erdogan TAN [ 07/07/2009 ] Last Update: 21/08/2011
    14                              <1> 
    15                              <1> get_next_cluster:
    16                              <1> 	; 15/10/2016
    17                              <1> 	; 23/03/2016
    18                              <1> 	; 01/02/2016 (TRDOS 386 =  TRDOS v2.0)
    19                              <1> 	; 05/07/2011
    20                              <1> 	; 07/07/2009
    21                              <1> 	; 2005
    22                              <1> 	; INPUT ->
    23                              <1> 	;	EAX = Cluster Number (32 bit)
    24                              <1> 	;	ESI = Logical DOS Drive Parameters Table
    25                              <1> 	; OUTPUT ->
    26                              <1> 	;	cf = 0 -> No Error, EAX valid
    27                              <1> 	;	cf = 1 & EAX = 0 -> End Of Cluster Chain
    28                              <1> 	;	cf = 1 & EAX > 0 -> Error
    29                              <1> 	;	ECX = Current/Previous cluster (if CF = 0)
    30                              <1> 	;	EAX = Next Cluster Number (32 bit)
    31                              <1> 	;
    32                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
    33                              <1> 
    34 0000CD56 A3[66890100]        <1> 	mov	[FAT_CurrentCluster], eax
    35                              <1> check_next_cluster_fat_type:
    36 0000CD5B 29D2                <1> 	sub	edx, edx ; 0
    37 0000CD5D 807E0302            <1>         cmp     byte [esi+LD_FATType], 2
    38 0000CD61 7250                <1> 	jb	short get_FAT12_next_cluster
    39 0000CD63 0F87AF000000        <1>         ja      get_FAT32_next_cluster
    40                              <1> get_FAT16_next_cluster:
    41 0000CD69 BB00030000          <1> 	mov	ebx, 300h ;768
    42 0000CD6E F7F3                <1> 	div	ebx
    43                              <1> 	; EAX = Count of 3 FAT sectors
    44                              <1> 	; EDX = Cluster Offset (< 768)
    45 0000CD70 66D1E2              <1> 	shl	dx, 1 ; Multiply by 2
    46 0000CD73 89D3                <1> 	mov	ebx, edx ; Byte Offset
    47 0000CD75 81C3001C0900        <1> 	add	ebx, FAT_Buffer
    48 0000CD7B 66BA0300            <1> 	mov	dx, 3
    49 0000CD7F F7E2                <1> 	mul	edx  
    50                              <1> 	; EAX = FAT Sector (<= 256)
    51                              <1> 	; EDX = 0
    52 0000CD81 8A0E                <1> 	mov	cl, [esi+LD_Name]
    53 0000CD83 803D[6A890100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
    54 0000CD8A 0F86CC000000        <1>         jna     load_FAT_sectors0
    55 0000CD90 3A0D[6B890100]      <1> 	cmp	cl, [FAT_BuffDrvName]
    56 0000CD96 0F85C0000000        <1>         jne     load_FAT_sectors0
    57 0000CD9C 3B05[6E890100]      <1> 	cmp	eax, [FAT_BuffSector]
    58 0000CDA2 0F85BA000000        <1>         jne     load_FAT_sectors1
    59                              <1> 	;movzx	eax, word [ebx]
    60 0000CDA8 668B03              <1> 	mov	ax, [ebx]
    61                              <1> 	; 01/02/2016
    62                              <1> 	; DRV_FAT.ASM (21/08/2011) had a FATal bug here !
    63                              <1> 	; (cmp ah, 0Fh) ! (ax >= FF7h)
    64                              <1> 	; (how can i do a such mistake!?)
    65                              <1> 	;cmp	al, 0F7h
    66                              <1> 	;jb	short loc_pass_gnc_FAT16_eoc_check
    67                              <1> 	;cmp	ah, 0FFh
    68                              <1> 	;jb	short loc_pass_gnc_FAT16_eoc_check
    69 0000CDAB 6683F8F7            <1> 	cmp	ax, 0FFF7h
    70 0000CDAF 725A                <1> 	jb	short loc_pass_gnc_FAT16_eoc_check
    71                              <1> 	; ax >= FFF7h (cluster 0002h to FFF6h is valid, in use)
    72 0000CDB1 EB56                <1> 	jmp	short loc_pass_gnc_FAT16_eoc_check_xor_eax
    73                              <1> 
    74                              <1> get_FAT12_next_cluster:
    75 0000CDB3 BB00040000          <1> 	mov	ebx, 400h ;1024
    76 0000CDB8 F7F3                <1> 	div	ebx
    77                              <1> 	; EAX = Count of 3 FAT sectors
    78                              <1> 	; EDX = Cluster Offset (< 1024)
    79 0000CDBA 6650                <1> 	push	ax
    80 0000CDBC 66B80300            <1> 	mov	ax, 3	
    81 0000CDC0 66F7E2              <1> 	mul	dx    	; Multiply by 3
    82 0000CDC3 66D1E8              <1> 	shr	ax, 1	; Divide by 2
    83 0000CDC6 6689C3              <1>         mov	bx, ax 	; Byte Offset
    84 0000CDC9 81C3001C0900        <1> 	add	ebx, FAT_Buffer
    85 0000CDCF 6658                <1> 	pop	ax
    86 0000CDD1 66BA0300            <1> 	mov	dx, 3
    87 0000CDD5 F7E2                <1> 	mul	edx 
    88                              <1> 	; EAX = FAT Sector (<= 12)
    89                              <1> 	; EDX = 0
    90 0000CDD7 8A0E                <1> 	mov	cl, [esi+LD_Name]
    91 0000CDD9 803D[6A890100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
    92 0000CDE0 767A                <1> 	jna	short load_FAT_sectors0
    93 0000CDE2 3A0D[6B890100]      <1> 	cmp	cl, [FAT_BuffDrvName]
    94 0000CDE8 7572                <1> 	jne	short load_FAT_sectors0
    95 0000CDEA 3B05[6E890100]      <1> 	cmp	eax, [FAT_BuffSector]
    96 0000CDF0 7570                <1> 	jne	short load_FAT_sectors1
    97 0000CDF2 A1[66890100]        <1> 	mov	eax, [FAT_CurrentCluster]
    98 0000CDF7 66D1E8              <1> 	shr	ax, 1
    99                              <1> 	;movzx	eax, word [ebx]
   100 0000CDFA 668B03              <1> 	mov	ax, [ebx]
   101 0000CDFD 7314                <1> 	jnc	short get_FAT12_nc_even
   102 0000CDFF 66C1E804            <1> 	shr	ax, 4
   103                              <1> loc_gnc_fat12_eoc_check:
   104                              <1> 	;cmp	al, 0F7h
   105                              <1> 	;jb	short loc_pass_gnc_FAT16_eoc_check
   106                              <1> 	;cmp	ah, 0Fh
   107                              <1> 	;jb	short loc_pass_gnc_FAT16_eoc_check
   108 0000CE03 663DF70F            <1> 	cmp	ax, 0FF7h
   109 0000CE07 7202                <1> 	jb	short loc_pass_gnc_FAT16_eoc_check
   110                              <1> 	; ax >= FF7h (cluster 0002h to FF6h is valid, in use)
   111                              <1> 
   112                              <1> loc_pass_gnc_FAT16_eoc_check_xor_eax:
   113 0000CE09 31C0                <1> 	xor	eax, eax ; 0
   114                              <1> loc_pass_gnc_FAT16_eoc_check:
   115                              <1> loc_pass_gnc_FAT32_eoc_check:
   116 0000CE0B 8B0D[66890100]      <1> 	mov	ecx, [FAT_CurrentCluster]
   117 0000CE11 F5                  <1> 	cmc
   118 0000CE12 C3                  <1> 	retn
   119                              <1> 
   120                              <1> get_FAT12_nc_even:
   121 0000CE13 80E40F              <1> 	and	ah, 0Fh
   122 0000CE16 EBEB                <1> 	jmp	short loc_gnc_fat12_eoc_check
   123                              <1> 
   124                              <1> get_FAT32_next_cluster:
   125 0000CE18 BB80010000          <1> 	mov	ebx, 180h ;384
   126 0000CE1D F7F3                <1> 	div	ebx
   127                              <1> 	; EAX = Count of 3 FAT sectors
   128                              <1> 	; EDX = Cluster Offset (< 384)
   129 0000CE1F 66C1E202            <1> 	shl	dx, 2	; Multiply by 4
   130 0000CE23 89D3                <1> 	mov	ebx, edx ; Byte Offset
   131 0000CE25 81C3001C0900        <1> 	add	ebx, FAT_Buffer
   132 0000CE2B 66BA0300            <1> 	mov	dx, 3
   133 0000CE2F F7E2                <1> 	mul	edx	
   134                              <1>         ; EAX = FAT Sector (<= 2097152) ; (FFFFFF7h * 4) / 512
   135                              <1> 	; 	for 32KB cluster size:
   136                              <1> 	;	EAX <= 1024 = (4GB / 32KB) * 4) / 512 	
   137                              <1> 	; EDX = 0
   138 0000CE31 8A0E                <1> 	mov	cl, [esi+LD_Name]
   139 0000CE33 803D[6A890100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
   140 0000CE3A 7620                <1> 	jna	short load_FAT_sectors0
   141 0000CE3C 3A0D[6B890100]      <1> 	cmp	cl, [FAT_BuffDrvName]
   142 0000CE42 7518                <1> 	jne	short load_FAT_sectors0
   143 0000CE44 3B05[6E890100]      <1> 	cmp	eax, [FAT_BuffSector] ; 0, 3, 6, 9 ...
   144 0000CE4A 7516                <1> 	jne	short load_FAT_sectors1
   145 0000CE4C 8B03                <1> 	mov	eax, [ebx]
   146 0000CE4E 25FFFFFF0F          <1>  	and	eax, 0FFFFFFFh ; 28 bit Cluster
   147 0000CE53 3DF7FFFF0F          <1> 	cmp	eax, 0FFFFFF7h
   148 0000CE58 72B1                <1> 	jb	short loc_pass_gnc_FAT32_eoc_check
   149                              <1> 	; eax >= FFFFFF7h (cluster 0002h to FFFFFF6h is valid)
   150 0000CE5A EBAD                <1> 	jmp	short loc_pass_gnc_FAT16_eoc_check_xor_eax
   151                              <1> 
   152                              <1> load_FAT_sectors0:
   153 0000CE5C 880D[6B890100]      <1> 	mov	[FAT_BuffDrvName], cl
   154                              <1> load_FAT_sectors1:
   155 0000CE62 A3[6E890100]        <1> 	mov	[FAT_BuffSector], eax
   156 0000CE67 89C3                <1> 	mov	ebx, eax
   157 0000CE69 034660              <1>         add     eax, [esi+LD_FATBegin]
   158 0000CE6C 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
   159 0000CE70 7706                <1>         ja      short load_FAT_sectors3
   160 0000CE72 0FB74E1C            <1> 	movzx	ecx, word [esi+LD_BPB+BPB_FATSz16]
   161 0000CE76 EB03                <1> 	jmp	short load_FAT_sectors4
   162                              <1> load_FAT_sectors3:
   163 0000CE78 8B4E2A              <1> 	mov	ecx, [esi+LD_BPB+BPB_FATSz32]
   164                              <1> load_FAT_sectors4:
   165 0000CE7B 29D9                <1> 	sub	ecx, ebx ; [FAT_BuffSector]
   166 0000CE7D 83F903              <1>         cmp     ecx, 3
   167 0000CE80 7605                <1>         jna     short load_FAT_sectors5
   168 0000CE82 B903000000          <1> 	mov	ecx, 3
   169                              <1> load_FAT_sectors5:
   170 0000CE87 BB001C0900          <1> 	mov	ebx, FAT_Buffer
   171 0000CE8C E88C540000          <1> 	call	disk_read
   172 0000CE91 730D                <1> 	jnc	short load_FAT_sectors_ok
   173                              <1> 	; 15/10/2016 (15h -> 17)
   174                              <1> 	; 23/03/2016 (15h)
   175 0000CE93 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
   176 0000CE98 C605[6A890100]00    <1> 	mov	byte [FAT_BuffValidData], 0
   177 0000CE9F C3                  <1> 	retn
   178                              <1> load_FAT_sectors_ok:
   179 0000CEA0 C605[6A890100]01    <1> 	mov	byte [FAT_BuffValidData], 1
   180 0000CEA7 A1[66890100]        <1> 	mov	eax, [FAT_CurrentCluster]
   181 0000CEAC E9AAFEFFFF          <1>         jmp     check_next_cluster_fat_type
   182                              <1> 
   183                              <1> load_FAT_root_directory:
   184                              <1> 	; 23/10/2016
   185                              <1> 	; 15/10/2016
   186                              <1> 	; 07/02/2016
   187                              <1> 	; 02/02/2016
   188                              <1> 	; 01/02/2016 (TRDOS 386 =  TRDOS v2.0)
   189                              <1> 	; 21/05/2011
   190                              <1> 	; 22/08/2009
   191                              <1> 	;
   192                              <1> 	; INPUT ->
   193                              <1> 	;	ESI = Logical DOS Drive Description Table
   194                              <1> 	; OUTPUT ->
   195                              <1> 	;	cf = 1 -> Root directory could not be loaded
   196                              <1> 	;	    EAX > 0 -> Error number
   197                              <1> 	;	cf = 0 -> EAX = 0
   198                              <1> 	;	ECX = Directory buffer size in sectors (CL)
   199                              <1> 	;	EBX = Directory buffer address
   200                              <1> 	; 	NOTE: DirBuffer_Size is in bytes ! (word)
   201                              <1> 	;
   202                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
   203                              <1> 
   204                              <1> 	; NOTE: Only for FAT12 and FAT16 file systems !
   205                              <1> 	; (FAT32 fs root dir must be loaded as sub directory)
   206                              <1> 
   207 0000CEB1 8A1E                <1> 	mov	bl, [esi+LD_Name]
   208 0000CEB3 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   209                              <1> 
   210                              <1> 	;mov	[DirBuff_DRV], bl
   211                              <1> 	;mov	[DirBuff_FATType], bh
   212 0000CEB6 66891D[7A890100]    <1> 	mov	[DirBuff_DRV], bx
   213                              <1> 	
   214                              <1> 	;cmp	bh, 2
   215                              <1> 	;ja	short load_FAT32_root_dir0 ; FAT32 root dir
   216                              <1> 
   217                              <1> load_FAT_root_dir0: ; 23/10/2016
   218 0000CEBD 0FB75617            <1> 	movzx	edx, word [esi+LD_BPB+RootDirEnts]
   219                              <1> 
   220                              <1> 	;or	dx, dx ; 0 for FAT32 file systems
   221                              <1> 	;jz	short load_FAT32_root_dir0 ; FAT32 root dir
   222                              <1> 
   223 0000CEC1 6681FA0002          <1> 	cmp	dx, 512 ; Number of Root Dir Entries
   224 0000CEC6 7414                <1> 	je	short lrd_mov_ecx_32
   225 0000CEC8 89D0                <1> 	mov	eax, edx
   226                              <1> 	; 23/10/2016
   227 0000CECA 89C1                <1> 	mov	ecx, eax
   228 0000CECC 6683C10F            <1> 	add	cx, 15 ; round up 
   229 0000CED0 66C1E904            <1> 	shr	cx, 4  ; 16 entries per sector (512/32)
   230                              <1> 	; ecx = Root directory size in sectors
   231 0000CED4 66C1E005            <1> 	shl	ax, 5 ; Root directory size in bytes
   232 0000CED8 664A                <1> 	dec	dx    ; Last entry number of root dir
   233                              <1> 	; cx = Dir Buffer sector count             
   234 0000CEDA EB0B                <1> 	jmp	short lrd_check_dir_buffer
   235                              <1> 
   236                              <1> lrd_mov_ecx_32:
   237 0000CEDC B920000000          <1> 	mov	ecx, 32
   238 0000CEE1 664A                <1> 	dec	dx ; 511
   239 0000CEE3 66B80040            <1> 	mov	ax, 32*512 
   240                              <1>  
   241                              <1> lrd_check_dir_buffer:
   242 0000CEE7 29DB                <1> 	sub	ebx, ebx ; 0
   243 0000CEE9 881D[7C890100]      <1> 	mov	[DirBuff_ValidData], bl ; 0
   244 0000CEEF 668915[7F890100]    <1> 	mov	[DirBuff_LastEntry], dx
   245 0000CEF6 891D[81890100]      <1> 	mov	[DirBuff_Cluster], ebx ; 0
   246 0000CEFC 66A3[85890100]      <1> 	mov	[DirBuffer_Size], ax
   247                              <1> 
   248 0000CF02 8B4664              <1> 	mov	eax, [esi+LD_ROOTBegin]
   249                              <1> read_directory:
   250 0000CF05 BB00000800          <1> 	mov	ebx, Directory_Buffer
   251 0000CF0A 51                  <1> 	push	ecx ; Directory buffer sector count
   252 0000CF0B 53                  <1> 	push	ebx
   253 0000CF0C E80C540000          <1> 	call	disk_read
   254 0000CF11 5B                  <1> 	pop	ebx
   255 0000CF12 720B                <1> 	jc	short load_DirBuff_error
   256                              <1> 
   257                              <1> validate_DirBuff_and_return:
   258 0000CF14 59                  <1> 	pop	ecx ; Number of loaded sectors
   259 0000CF15 C605[7C890100]01    <1> 	mov	byte [DirBuff_ValidData], 1
   260 0000CF1C 31C0                <1> 	xor	eax, eax ; 0 = no error
   261 0000CF1E C3                  <1> 	retn
   262                              <1> 
   263                              <1> load_DirBuff_error:
   264 0000CF1F 89C8                <1> 	mov	eax, ecx ; remaining sectors
   265 0000CF21 59                  <1> 	pop	ecx ; sector count
   266 0000CF22 29C1                <1> 	sub	ecx, eax ; Number of loaded sectors
   267                              <1> 	; 15/10/2016 (15h -> 17)
   268 0000CF24 B811000000          <1> 	mov	eax, 17 ; DRV NOT READY OR READ ERROR !
   269 0000CF29 F9                  <1> 	stc
   270 0000CF2A C3                  <1>         retn
   271                              <1> 
   272                              <1> load_FAT32_root_directory:
   273                              <1> 	; 02/02/2016 (TRDOS 386 =  TRDOS v2.0)
   274                              <1> 	;
   275                              <1> 	; INPUT ->
   276                              <1> 	;	ESI = Logical DOS Drive Description Table
   277                              <1> 	; OUTPUT ->
   278                              <1> 	;	cf = 1 -> Root directory could not be loaded
   279                              <1> 	;	    EAX > 0 -> Error number
   280                              <1> 	;	cf = 0 -> EAX = 0
   281                              <1> 	;	ECX = Directory buffer size in sectors (CL)
   282                              <1> 	;	EBX = Directory buffer address
   283                              <1> 	; 	NOTE: DirBuffer_Size is in bytes ! (word)
   284                              <1> 	;
   285                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
   286                              <1> 
   287                              <1> 
   288 0000CF2B 8A1E                <1> 	mov	bl, [esi+LD_Name]
   289 0000CF2D 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   290                              <1> 
   291                              <1> 	;mov	[DirBuff_DRV], bl
   292                              <1> 	;mov	[DirBuff_FATType], bh
   293 0000CF30 66891D[7A890100]    <1> 	mov	[DirBuff_DRV], bx
   294                              <1> 
   295                              <1> load_FAT32_root_dir0:
   296 0000CF37 8B4632              <1> 	mov	eax, [esi+LD_BPB+FAT32_RootFClust]
   297 0000CF3A EB0C                <1> 	jmp	short load_FAT_sub_dir0
   298                              <1> 	
   299                              <1> load_FAT_sub_directory:
   300                              <1> 	; 01/02/2016 (TRDOS 386 =  TRDOS v2.0)
   301                              <1> 	; 05/07/2011
   302                              <1> 	; 23/08/2009
   303                              <1> 	;
   304                              <1> 	; INPUT ->
   305                              <1> 	;	ESI = Logical DOS Drive Description Table
   306                              <1> 	;	EAX = Cluster Number
   307                              <1> 	; OUTPUT ->
   308                              <1> 	;	cf = 1 -> Sub directory could not be loaded
   309                              <1> 	;	    EAX > 0 -> Error number
   310                              <1> 	;	cf = 0 -> EAX = 0
   311                              <1> 	;	ECX = Directory buffer size in sectors (CL)
   312                              <1> 	;	EBX = Directory buffer address
   313                              <1> 	;
   314                              <1> 	; 	NOTE: DirBuffer_Size is in bytes ! (word)
   315                              <1> 	;
   316                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
   317                              <1> 
   318 0000CF3C 8A1E                <1> 	mov	bl, [esi+LD_Name]
   319 0000CF3E 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   320                              <1> 
   321                              <1> 	;mov	[DirBuff_DRV], bl
   322                              <1> 	;mov	[DirBuff_FATType], bh
   323 0000CF41 66891D[7A890100]    <1> 	mov	[DirBuff_DRV], bx
   324                              <1> 
   325                              <1> load_FAT_sub_dir0:
   326 0000CF48 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
   327                              <1> 
   328 0000CF4C 882D[7C890100]      <1> 	mov	[DirBuff_ValidData], ch ; 0
   329 0000CF52 A3[81890100]        <1> 	mov	[DirBuff_Cluster], eax
   330                              <1> 
   331 0000CF57 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
   332 0000CF5B F7E1                <1> 	mul	ecx
   333 0000CF5D C1E805              <1> 	shr	eax, 5 ; directory entry count (dir size / 32)
   334 0000CF60 6648                <1> 	dec	ax ; last entry
   335 0000CF62 66A3[7F890100]      <1> 	mov	[DirBuff_LastEntry], ax
   336                              <1> 
   337 0000CF68 A1[81890100]        <1> 	mov	eax, [DirBuff_Cluster]
   338 0000CF6D 83E802              <1> 	sub	eax, 2
   339 0000CF70 F7E1                <1> 	mul	ecx
   340 0000CF72 034668              <1> 	add	eax, [esi+LD_DATABegin]
   341                              <1> 	; ecx = sector per cluster (dir buffer size = 32 sectors)
   342 0000CF75 EB8E                <1> 	jmp	short read_directory
   343                              <1> 
   344                              <1> ; DRV_FS.ASM
   345                              <1> 
   346                              <1> load_current_FS_directory:
   347 0000CF77 C3                  <1> 	retn
   348                              <1> load_FS_root_directory:
   349 0000CF78 C3                  <1> 	retn
   350                              <1> load_FS_sub_directory:
   351 0000CF79 C3                  <1> 	retn
   352                              <1> 
   353                              <1> read_cluster:
   354                              <1> 	; 15/10/2016
   355                              <1> 	; 18/03/2016
   356                              <1> 	; 16/03/2016
   357                              <1> 	; 17/02/2016
   358                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
   359                              <1> 	;
   360                              <1> 	; INPUT ->
   361                              <1> 	;	EAX = Cluster Number (Sector index for SINGLIX FS)
   362                              <1> 	;	ESI = Logical DOS Drive Description Table address
   363                              <1> 	;	EBX = Cluster (File R/W) Buffer address (max. 64KB)
   364                              <1> 	;	Only for SINGLIX FS:
   365                              <1> 	;	EDX = File Number (The 1st FDT address) 
   366                              <1> 	; OUTPUT ->
   367                              <1> 	;	cf = 1 -> Cluster can not be loaded at the buffer
   368                              <1> 	;	    EAX > 0 -> Error number
   369                              <1> 	;	cf = 0 -> Cluster has been loaded at the buffer
   370                              <1> 	;
   371                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
   372                              <1> 	
   373 0000CF7A 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+BPB_SecPerClust] 
   374                              <1> 	; CL = 1 = [esi+LD_FS_Reserved2] ; SectPerClust for Singlix FS
   375                              <1> 
   376                              <1> read_file_sectors: ; 16/03/2016
   377 0000CF7E 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
   378 0000CF82 761C                <1> 	jna	short read_fs_cluster
   379                              <1> 
   380                              <1> read_fat_file_sectors: ; 18/03/2016
   381 0000CF84 83E802              <1> 	sub	eax, 2 ; Beginning cluster number is always 2
   382 0000CF87 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+BPB_SecPerClust] ; 18/03/2016 
   383 0000CF8B F7E2                <1> 	mul	edx
   384 0000CF8D 034668              <1> 	add	eax, [esi+LD_DATABegin] ; absolute address of the cluster
   385                              <1> 
   386                              <1> 	; EAX = Disk sector address
   387                              <1> 	; ECX = Sector count
   388                              <1> 	; EBX = Buffer address
   389                              <1> 	; (EDX = 0)
   390                              <1> 	; ESI = Logical DOS drive description table address	
   391                              <1> 
   392 0000CF90 E888530000          <1> 	call	disk_read
   393 0000CF95 7306                <1> 	jnc	short rclust_retn
   394                              <1> 	
   395                              <1> 	; 15/10/2016 (15h -> 17)
   396 0000CF97 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
   397 0000CF9C C3                  <1> 	retn
   398                              <1> 
   399                              <1> rclust_retn:
   400 0000CF9D 29C0                <1> 	sub	eax, eax ; 0
   401 0000CF9F C3                  <1> 	retn
   402                              <1> 
   403                              <1> read_fs_cluster:
   404                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
   405                              <1> 	; Singlix FS
   406                              <1> 	
   407                              <1> 	; EAX = Cluster number is sector index number of the file (eax)
   408                              <1> 	
   409                              <1> 	; EDX = File number is the first File Descriptor Table address 
   410                              <1> 	;	of the file. (Absolute address of the FDT).
   411                              <1> 	
   412                              <1> 	; eax = sector index (0 for the first sector)
   413                              <1> 	; edx = FDT0 address
   414                              <1> 		; 64 KB buffer = 128 sectors (limit) 
   415 0000CFA0 B980000000          <1> 	mov	ecx, 128 ; maximum count of sectors (before eof) 
   416 0000CFA5 E801000000          <1> 	call	read_fs_sectors
   417 0000CFAA C3                  <1> 	retn
   418                              <1> 
   419                              <1> read_fs_sectors:
   420                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
   421 0000CFAB F9                  <1> 	stc
   422 0000CFAC C3                  <1> 	retn
   423                              <1> 
   424                              <1> get_first_free_cluster:
   425                              <1> 	; 02/03/2016
   426                              <1> 	; 21/02/2016 (TRDOS 386 =  TRDOS v2.0)
   427                              <1> 	; 26/10/2010 (DRV_FAT.ASM, 'proc_get_first_free_cluster')
   428                              <1> 	; 10/07/2010
   429                              <1> 	; INPUT ->
   430                              <1> 	;	ESI = Logical DOS Drive Description Table address
   431                              <1> 	; OUTPUT ->
   432                              <1> 	;	cf = 1 -> Error code in AL (EAX)
   433                              <1> 	;	cf = 0 -> 
   434                              <1> 	;	  EAX = Cluster number 
   435                              <1> 	;	  If EAX = FFFFFFFFh -> no free space
   436                              <1> 	;	If the drive has FAT32 fs:
   437                              <1> 	;	  EBX = FAT32 FSI sector buffer address (if > 0)
   438                              <1> 
   439 0000CFAD 8B4678              <1> 	mov	eax, [esi+LD_Clusters]
   440 0000CFB0 40                  <1> 	inc	eax ; add eax, 1
   441 0000CFB1 A3[048C0100]        <1> 	mov	[gffc_last_free_cluster], eax
   442                              <1> 
   443 0000CFB6 31DB                <1> 	xor	ebx, ebx ; 0 ; 02/03/2016
   444                              <1> 
   445 0000CFB8 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
   446 0000CFBC 760E                <1> 	jna	short loc_gffc_get_first_fat_free_cluster0
   447                              <1> 
   448                              <1> loc_gffc_get_first_fat32_free_cluster:
   449                              <1> 	; 02/03/2016
   450 0000CFBE E844060000          <1> 	call	get_fat32_fsinfo_sector_parms
   451 0000CFC3 7207                <1> 	jc	short loc_gffc_get_first_fat_free_cluster0 
   452                              <1> 
   453                              <1> loc_gffc_check_fsinfo_parms:
   454                              <1> 	;;mov	ebx, DOSBootSectorBuff
   455                              <1> 	;cmp	dword [ebx], 41615252h
   456                              <1> 	;jne	short loc_gffc_fat32_fsinfo_err
   457                              <1> 	;cmp	dword [ebx+484], 61417272h
   458                              <1> 	;jne	short loc_gffc_fat32_fsinfo_err
   459                              <1> 	;mov	eax, [ebx+492] ; FSI_Next_Free
   460                              <1> 	;EAX = First free cluster 
   461                              <1> 	;(from FAT32 FSInfo sector)
   462 0000CFC5 89D0                <1> 	mov	eax, edx ; FSI_Next_Free (First Free Cluster)
   463 0000CFC7 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh ; invalid (unknown) !
   464 0000CFCA 7205                <1> 	jb	short loc_gffc_get_first_fat_free_cluster1
   465                              <1> 
   466                              <1> 	; Start from the 1st cluster of the FAT(32) file system
   467                              <1> loc_gffc_get_first_fat_free_cluster0:
   468 0000CFCC B802000000          <1> 	mov	eax, 2
   469                              <1> 	;xor	edx, edx
   470                              <1> 
   471                              <1> loc_gffc_get_first_fat_free_cluster1:
   472 0000CFD1 53                  <1> 	push	ebx ; 02/03/2016 
   473                              <1> 
   474                              <1> loc_gffc_get_first_fat_free_cluster2:   
   475 0000CFD2 A3[008C0100]        <1> 	mov	[gffc_first_free_cluster], eax
   476 0000CFD7 A3[FC8B0100]        <1> 	mov	[gffc_next_free_cluster], eax
   477                              <1> 
   478                              <1> 	; EBX = FAT32 FSINFO sector buffer address
   479                              <1> 	; (EBX = 0, if the drive has not got FAT32 fs or
   480                              <1> 	; FAT32 FSINFO sector buffer is invalid.)
   481                              <1> 
   482                              <1> loc_gffc_get_first_fat_free_cluster3:
   483 0000CFDC E875FDFFFF          <1> 	call	get_next_cluster
   484 0000CFE1 7307                <1> 	jnc	short loc_gffc_get_first_fat_free_cluster4
   485 0000CFE3 09C0                <1> 	or	eax, eax
   486 0000CFE5 740B                <1> 	jz	short loc_gffc_first_free_fat_cluster_next
   487 0000CFE7 5B                  <1> 	pop	ebx ; 02/03/2016
   488 0000CFE8 F5                  <1> 	cmc 	; stc
   489 0000CFE9 C3                  <1> 	retn
   490                              <1> 
   491                              <1> loc_gffc_get_first_fat_free_cluster4:
   492 0000CFEA 21C0                <1> 	and	eax, eax ; next cluster value
   493 0000CFEC 7504                <1> 	jnz	short loc_gffc_first_free_fat_cluster_next
   494 0000CFEE 89C8                <1> 	mov	eax, ecx ; current (previous cluster) value
   495 0000CFF0 EB22                <1> 	jmp	short loc_gffc_check_for_set
   496                              <1>  
   497                              <1> loc_gffc_first_free_fat_cluster_next:
   498 0000CFF2 A1[FC8B0100]        <1> 	mov	eax, [gffc_next_free_cluster]
   499 0000CFF7 3B05[048C0100]      <1> 	cmp	eax, [gffc_last_free_cluster]
   500 0000CFFD 7308                <1> 	jnb	short retn_stc_from_get_first_free_cluster
   501                              <1> pass_gffc_last_cluster_eax_check:
   502 0000CFFF 40                  <1> 	inc	eax ; add eax, 1
   503 0000D000 A3[FC8B0100]        <1> 	mov	[gffc_next_free_cluster], eax
   504 0000D005 EBD5                <1> 	jmp	short loc_gffc_get_first_fat_free_cluster3
   505                              <1> 
   506                              <1> retn_stc_from_get_first_free_cluster:
   507 0000D007 A1[008C0100]        <1> 	mov	eax, [gffc_first_free_cluster]
   508 0000D00C 83F802              <1> 	cmp	eax, 2
   509 0000D00F 7709                <1> 	ja	short loc_gffc_check_previous_clusters
   510 0000D011 29C0                <1> 	sub	eax, eax
   511 0000D013 48                  <1> 	dec	eax ; FFFFFFFFh
   512                              <1> 
   513                              <1> loc_gffc_check_for_set:
   514                              <1> 	; 02/03/2016
   515 0000D014 5B                  <1> 	pop	ebx
   516                              <1> 
   517                              <1> 	; EBX = FAT32 FSINFO sector buffer address
   518                              <1> 	; (EBX = 0, if the drive has not got FAT32 fs or
   519                              <1> 	; FAT32 FSINFO sector buffer is invalid.)
   520                              <1> 
   521 0000D015 09DB                <1> 	or	ebx, ebx
   522 0000D017 750E                <1> 	jnz	short loc_gffc_set_ffree_fat32_cluster
   523                              <1> 
   524                              <1> 	;cmp	byte [esi+LD_FATType], 3
   525                              <1> 	;jnb	short loc_gffc_set_ffree_fat32_cluster
   526                              <1> 
   527                              <1> 	;xor	ebx, ebx ; 0
   528                              <1> 
   529                              <1> loc_gffc_retn:
   530 0000D019 C3                  <1> 	retn
   531                              <1> 
   532                              <1> loc_gffc_check_previous_clusters:
   533 0000D01A 48                  <1> 	dec	eax ; sub eax, 1
   534 0000D01B A3[048C0100]        <1> 	mov	[gffc_last_free_cluster], eax 
   535 0000D020 B802000000          <1> 	mov	eax, 2
   536                              <1> 	;xor	edx, edx
   537 0000D025 EBAB                <1> 	jmp	short loc_gffc_get_first_fat_free_cluster2
   538                              <1> 
   539                              <1> loc_gffc_set_ffree_fat32_cluster:
   540                              <1> 	;call	set_first_free_cluster
   541                              <1> 	;retn
   542                              <1> 	;jmp	short set_first_free_cluster	
   543                              <1> 
   544                              <1> set_first_free_cluster:
   545                              <1> 	; 15/10/2016
   546                              <1> 	; 23/03/2016
   547                              <1> 	; 02/03/2016
   548                              <1> 	; 29/02/2016
   549                              <1> 	; 26/02/2016
   550                              <1> 	; 21/02/2016 (TRDOS 386 =  TRDOS v2.0)
   551                              <1> 	; 21/08/2011 (DRV_FAT.ASM, 'proc_set_first_free_cluster')
   552                              <1> 	; 11/07/2010
   553                              <1> 	; INPUT -> 
   554                              <1> 	;	ESI = Logical DOS Drive Description Table address
   555                              <1> 	;	EAX = First free cluster
   556                              <1> 	;	EBX = FSINFO sector buffer address
   557                              <1> 	;  	;;If EBX > 0, it is FSINFO sector buffer address
   558                              <1> 	;	;;EBX = 0, if FSINFO sector is not loaded
   559                              <1> 	; OUTPUT->
   560                              <1> 	;	ESI = Logical DOS Drive Description Table address
   561                              <1> 	;  	If EBX > 0, it is FSINFO sector buffer address
   562                              <1> 	;	EBX = 0, if FSINFO sector could not be loaded
   563                              <1> 	; 	CF = 1 -> Error code in AL (EAX)
   564                              <1> 	;	CF = 0 -> first free cluster is successfully updated 
   565                              <1> 
   566                              <1> 	;cmp	byte [esi+LD_FATType], 3
   567                              <1> 	;jb	short loc_sffc_invalid_drive
   568                              <1> 
   569                              <1> 	; Save First Free Cluster value for 'update_cluster'
   570 0000D027 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; First free Cluster	
   571                              <1> 
   572                              <1> 	;or	ebx, ebx
   573                              <1> 	;jnz	short loc_sffc_read_fsinfo_sector
   574                              <1> 
   575 0000D02A 813B52526141        <1> 	cmp     dword [ebx], 41615252h
   576 0000D030 7540                <1> 	jne	short loc_sffc_read_fsinfo_sector
   577 0000D032 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
   577 0000D03B 61                  <1>
   578 0000D03C 7534                <1> 	jne	short loc_sffc_read_fsinfo_sector
   579                              <1> 
   580 0000D03E 3B83EC010000        <1> 	cmp	eax, [ebx+492]  ; FSI_Next_Free
   581 0000D044 741F                <1> 	je	short loc_sffc_retn
   582                              <1> 
   583                              <1> loc_sffc_write_fsinfo_sector:
   584                              <1> 	; EBX = FSINFO sector buffer
   585                              <1> 	; [CFS_FAT32FSINFOSEC] is set in 'get_fat32_fsinfo_sector_parms'
   586 0000D046 8983EC010000        <1> 	mov	[ebx+492], eax
   587 0000D04C A1[148C0100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC] 
   588 0000D051 B901000000          <1> 	mov	ecx, 1
   589 0000D056 53                  <1> 	push	ebx
   590 0000D057 E8B2520000          <1> 	call	disk_write
   591 0000D05C 7208                <1> 	jc      short loc_sffc_read_fsinfo_sector_err1
   592 0000D05E 5B                  <1> 	pop	ebx
   593                              <1> 
   594 0000D05F 8B83EC010000        <1> 	mov	eax, [ebx+492] ; First (Next) Free Cluster
   595                              <1> 
   596                              <1> loc_sffc_retn:
   597 0000D065 C3                  <1> 	retn
   598                              <1> 
   599                              <1> ;loc_sffc_invalid_drive:
   600                              <1> ;	mov	eax, 0Fh ; MSDOS Error : Invalid drive
   601                              <1> ;	push	edx
   602                              <1> 
   603                              <1> loc_sffc_read_fsinfo_sector_err1:
   604 0000D066 BB00000000          <1> 	mov	ebx, 0
   605                              <1> 	; 15/10/2016 (1Dh -> 18)
   606                              <1> 	; 23/03/2016 (1Dh)
   607 0000D06B B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error
   608                              <1> 
   609                              <1> loc_sffc_read_fsinfo_sector_err2:
   610 0000D070 5A                  <1> 	pop	edx
   611 0000D071 C3                  <1> 	retn
   612                              <1> 	
   613                              <1> loc_sffc_read_fsinfo_sector:
   614 0000D072 50                  <1> 	push	eax
   615                              <1> 
   616 0000D073 E88F050000          <1> 	call	get_fat32_fsinfo_sector_parms
   617 0000D078 72F6                <1> 	jc	short loc_sffc_read_fsinfo_sector_err2
   618                              <1> 
   619 0000D07A 58                  <1> 	pop	eax
   620                              <1> 	; EDX = First (Next) Free Cluster value from FSINFO sector
   621                              <1> 	; EAX = First Free Cluster value from 'get_next_cluster'
   622                              <1> 	; (edx = old value)
   623 0000D07B 39D0                <1> 	cmp	eax, edx ; First free Cluster (eax = new value) 
   624 0000D07D 75C7                <1> 	jne	short loc_sffc_write_fsinfo_sector
   625                              <1> 
   626 0000D07F C3                  <1> 	retn	
   627                              <1> 
   628                              <1> update_cluster:
   629                              <1> 	; 23/10/2016
   630                              <1> 	; 23/03/2016
   631                              <1> 	; 02/03/2016
   632                              <1> 	; 01/03/2016
   633                              <1> 	; 29/02/2016
   634                              <1> 	; 27/02/2016
   635                              <1> 	; 26/02/2016
   636                              <1> 	; 22/02/2016 (TRDOS 386 =  TRDOS v2.0)
   637                              <1> 	; 11/08/2011  
   638                              <1> 	; 09/02/2005
   639                              <1> 	; INPUT ->
   640                              <1> 	;	EAX = Cluster Number
   641                              <1> 	;	ECX = New Cluster Value
   642                              <1> 	;	ESI = Logical Dos Drive Parameters Table
   643                              <1> 	;
   644                              <1> 	;	/// dword [FAT_ClusterCounter] ///
   645                              <1> 	;
   646                              <1> 	; OUTPUT ->
   647                              <1> 	;	cf = 0 -> No Error, EAX is valid
   648                              <1> 	;	cf = 1 & EAX = 0 -> End Of Cluster Chain
   649                              <1> 	; 	cf = 1 & EAX > 0 -> Error
   650                              <1> 	;		(ECX -> any value)
   651                              <1> 	; 	EAX = Next Cluster
   652                              <1> 	;	ECX = New Cluster Value
   653                              <1> 	;
   654                              <1> 	;	/// [FAT_ClusterCounter] is updated,
   655                              <1> 	;	/// decreased when a free cluster is assigned,
   656                              <1> 	;	/// increased if an assigned cluster is freed.	
   657                              <1> 	;		
   658                              <1> 	;
   659                              <1> 	; (Modified registers: EAX, EBX, -ECX-, EDX)
   660                              <1> 	
   661 0000D080 A3[66890100]        <1> 	mov	[FAT_CurrentCluster], eax
   662 0000D085 890D[088C0100]      <1> 	mov	[ClusterValue], ecx
   663                              <1> 
   664                              <1> loc_update_cluster_check_fat_buffer:
   665 0000D08B 8A1E                <1> 	mov	bl, [esi+LD_Name]
   666 0000D08D 381D[6B890100]      <1> 	cmp	[FAT_BuffDrvName], bl
   667 0000D093 741A                <1> 	je	short loc_update_cluster_check_fat_type
   668 0000D095 803D[6A890100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
   669 0000D09C 0F84C2000000        <1>         je      loc_uc_save_fat_buffer
   670                              <1> 
   671                              <1> loc_uc_reset_fat_buffer_validation:
   672 0000D0A2 C605[6A890100]00    <1> 	mov	byte [FAT_BuffValidData], 0
   673                              <1> 
   674                              <1> loc_uc_check_fat_type_reset_drvname:
   675 0000D0A9 881D[6B890100]      <1> 	mov	[FAT_BuffDrvName], bl
   676                              <1> 
   677                              <1> loc_update_cluster_check_fat_type:
   678 0000D0AF 29D2                <1> 	sub	edx, edx ; 26/02/2016
   679 0000D0B1 8A5E03              <1> 	mov	bl, [esi+LD_FATType]
   680 0000D0B4 83F802              <1> 	cmp	eax, 2
   681 0000D0B7 0F82BE000000        <1>         jb      update_cluster_inv_data
   682 0000D0BD 80FB02              <1> 	cmp	bl, 2 
   683 0000D0C0 0F877A010000        <1>         ja      update_fat32_cluster
   684                              <1> 	;cmp	bl, 1
   685                              <1> 	;jb	short update_cluster_inv_data
   686 0000D0C6 8B4E78              <1> 	mov	ecx, [esi+LD_Clusters]
   687 0000D0C9 41                  <1> 	inc	ecx  
   688 0000D0CA 890D[76890100]      <1> 	mov	[LastCluster], ecx
   689 0000D0D0 39C8                <1> 	cmp	eax, ecx ; dword [LastCluster]
   690 0000D0D2 0F87A6000000        <1>         ja      return_uc_fat_stc
   691                              <1> 	; TRDOS v1 has a FATal bug here ! 
   692                              <1> 		; or bl, bl ; cmp bl, 0
   693                              <1> 		; jz short update_fat12_cluster
   694                              <1> 	; !! It would destroy FAT12 floppy disk fs here !!
   695                              <1> 	; ('A:' disks of TRDOS v1 operating system project
   696                              <1> 	; had 'singlix fs', so, I could not differ this mistake
   697                              <1> 	; on a drive 'A:')
   698 0000D0D8 80FB01              <1> 	cmp	bl, 1 ; correct comparison is this !
   699 0000D0DB 0F86A2000000        <1>         jna     update_fat12_cluster 
   700                              <1> 
   701                              <1> update_fat16_cluster:
   702                              <1> pass_uc_fat16_errc:
   703                              <1> 	;sub	edx, edx
   704 0000D0E1 BB00030000          <1> 	mov	ebx, 300h ;768
   705 0000D0E6 F7F3                <1> 	div	ebx
   706                              <1> 	; EAX = Count of 3 FAT sectors
   707                              <1> 	; DX = Cluster offset in FAT buffer
   708 0000D0E8 6689D3              <1> 	mov	bx, dx  
   709 0000D0EB 66D1E3              <1> 	shl	bx, 1 ; Multiply by 2
   710 0000D0EE 66BA0300            <1> 	mov	dx, 3
   711 0000D0F2 F7E2                <1> 	mul	edx  
   712                              <1> 	; EAX = FAT Sector
   713                              <1> 	; EDX = 0
   714                              <1> 	; EBX = Byte offset in FAT buffer
   715 0000D0F4 8A0D[6A890100]      <1> 	mov	cl, [FAT_BuffValidData]
   716 0000D0FA 80F902              <1> 	cmp	cl, 2
   717 0000D0FD 750A                <1> 	jne	short loc_uc_check_fat16_buff_sector_load
   718                              <1> 
   719                              <1> loc_uc_check_fat16_buff_sector_save:
   720 0000D0FF 3B05[6E890100]      <1> 	cmp	eax, [FAT_BuffSector]
   721 0000D105 755D                <1> 	jne	short loc_uc_save_fat_buffer
   722 0000D107 EB15                <1> 	jmp	short loc_update_fat16_cell
   723                              <1> 
   724                              <1> loc_uc_check_fat16_buff_sector_load:
   725 0000D109 80F901              <1> 	cmp	cl, 1 ; byte [FAT_BuffValidData]
   726 0000D10C 0F85FB010000        <1>         jne     loc_uc_load_fat_sectors
   727 0000D112 3B05[6E890100]      <1> 	cmp	eax, [FAT_BuffSector]
   728 0000D118 0F85EF010000        <1>         jne     loc_uc_load_fat_sectors
   729                              <1> 
   730                              <1> loc_update_fat16_cell:
   731                              <1> loc_update_fat16_buffer:
   732 0000D11E 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   733                              <1> 	;movzx	eax, word [ebx]
   734 0000D124 668B03              <1> 	mov	ax, [ebx]
   735                              <1> 	; 01/03/2016
   736 0000D127 89C2                <1> 	mov	edx, eax ; old value of the cluster
   737 0000D129 A3[66890100]        <1> 	mov	[FAT_CurrentCluster], eax
   738 0000D12E 8B0D[088C0100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   739 0000D134 66890B              <1> 	mov	[ebx], cx ; 16 bits !
   740                              <1> 
   741 0000D137 C605[6A890100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   742                              <1> 	
   743 0000D13E 6683F802            <1> 	cmp	ax, 2
   744 0000D142 723A                <1> 	jb	short return_uc_fat_stc
   745 0000D144 3B05[76890100]      <1> 	cmp	eax, [LastCluster]
   746 0000D14A 7732                <1> 	ja	short return_uc_fat_stc
   747                              <1> 
   748                              <1> loc_fat_buffer_updated:
   749                              <1> 	; 01/03/2016
   750 0000D14C F8                  <1> 	clc
   751                              <1> loc_fat_buffer_stc_1:
   752 0000D14D 9C                  <1> 	pushf
   753 0000D14E 21C9                <1> 	and	ecx, ecx
   754 0000D150 7506                <1> 	jnz	short loc_fat_buffer_updated_1
   755                              <1> 
   756                              <1> 	; 01/03/2016 
   757                              <1> 	; new value of the cluster = 0 (free)
   758                              <1> 	; increase free(d) cluster count
   759 0000D152 FF05[72890100]      <1> 	inc	dword [FAT_ClusterCounter]
   760                              <1> 
   761                              <1> loc_fat_buffer_updated_1: ; new value of the cluster > 0
   762 0000D158 09D2                <1> 	or	edx, edx ; 02/03/2016
   763 0000D15A 7506                <1> 	jnz	short loc_fat_buffer_updated_2
   764                              <1> 	; old value of the cluster = 0 (it was free cluster)
   765                              <1> 	; decrease free(d) cluster count
   766 0000D15C FF0D[72890100]      <1> 	dec	dword [FAT_ClusterCounter] ; it may be negative number
   767                              <1> 
   768                              <1> loc_fat_buffer_updated_2:
   769 0000D162 9D                  <1> 	popf
   770 0000D163 C3                  <1> 	retn
   771                              <1> 
   772                              <1> loc_uc_save_fat_buffer:
   773                              <1> 	; byte [FAT_BuffValidData] = 2 
   774 0000D164 E8D4010000          <1> 	call	save_fat_buffer
   775 0000D169 0F8297010000        <1>         jc      loc_fat_sectors_rw_error2
   776                              <1> 	;mov	byte [FAT_BuffValidData], 1
   777 0000D16F A1[66890100]        <1> 	mov	eax, [FAT_CurrentCluster]
   778                              <1> 	;mov	ecx, [ClusterValue]
   779                              <1> 	;jmp	short loc_update_cluster_check_fat_buffer
   780 0000D174 8A1E                <1> 	mov	bl, [esi+LD_Name] ; 01/03/2016
   781 0000D176 E927FFFFFF          <1>         jmp     loc_uc_reset_fat_buffer_validation
   782                              <1> 
   783                              <1> update_cluster_inv_data:
   784                              <1> 	;mov	eax, 0Dh
   785 0000D17B B00D                <1> 	mov	al, 0Dh  ; Invalid Data
   786 0000D17D C3                  <1> 	retn 
   787                              <1> 
   788                              <1> return_uc_fat_stc:
   789                              <1> 	; 01/03/2016
   790 0000D17E 31C0                <1> 	xor	eax, eax
   791 0000D180 F9                  <1> 	stc
   792 0000D181 EBCA                <1> 	jmp	short loc_fat_buffer_stc_1
   793                              <1> 
   794                              <1> update_fat12_cluster:
   795                              <1> pass_uc_fat12_errc:
   796                              <1> 	;sub	edx, edx
   797 0000D183 BB00040000          <1> 	mov	ebx, 400h ;1024
   798 0000D188 F7F3                <1> 	div	ebx
   799                              <1> 	; EAX = Count of 3 FAT sectors
   800                              <1> 	; DX = Cluster offset in FAT buffer
   801 0000D18A 66B90300            <1> 	mov	cx, 3
   802 0000D18E 6689C3              <1> 	mov	bx, ax
   803 0000D191 6689C8              <1> 	mov	ax, cx ; 3
   804 0000D194 66F7E2              <1> 	mul	dx     ; Multiply by 3
   805 0000D197 66D1E8              <1> 	shr	ax, 1  ; Divide by 2
   806 0000D19A 6693                <1> 	xchg	bx, ax
   807                              <1> 	; EAX = Count of 3 FAT sectors
   808                              <1> 	; EBX = Byte Offset in FAT buffer   
   809 0000D19C 66F7E1              <1> 	mul	cx  ; 3 * AX
   810                              <1> 	; EAX = FAT Beginning Sector
   811                              <1> 	; EDX = 0
   812 0000D19F 8A0D[6A890100]      <1> 	mov	cl, [FAT_BuffValidData]
   813                              <1> 	; TRDOS v1 has a FATal bug here ! 
   814                              <1> 	; (it does not have 'cmp cl, 2' instruction here !
   815                              <1> 	;  while 'jne' is existing !)
   816 0000D1A5 80F902              <1> 	cmp	cl, 2 ; 2 = dirty buffer (must be written to disk)
   817 0000D1A8 750A                <1> 	jne	short loc_uc_check_fat12_buff_sector_load
   818                              <1> 
   819                              <1> loc_uc_check_fat12_buff_sector_save:
   820 0000D1AA 3B05[6E890100]      <1> 	cmp	eax, [FAT_BuffSector]
   821 0000D1B0 75B2                <1>         jne     short loc_uc_save_fat_buffer
   822 0000D1B2 EB15                <1> 	jmp	short loc_update_fat12_cell
   823                              <1> 
   824                              <1> loc_uc_check_fat12_buff_sector_load:
   825 0000D1B4 80F901              <1> 	cmp	cl, 1 ; byte ptr [FAT_BuffValidData]
   826 0000D1B7 0F8550010000        <1>         jne     loc_uc_load_fat_sectors
   827 0000D1BD 3B05[6E890100]      <1> 	cmp	eax, [FAT_BuffSector]
   828 0000D1C3 0F8544010000        <1>         jne     loc_uc_load_fat_sectors
   829                              <1> 
   830                              <1> loc_update_fat12_cell:
   831 0000D1C9 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   832 0000D1CF 668B0D[66890100]    <1> 	mov	cx, [FAT_CurrentCluster]
   833 0000D1D6 66D1E9              <1> 	shr	cx, 1
   834 0000D1D9 668B03              <1> 	mov	ax, [ebx]
   835 0000D1DC 6689C2              <1> 	mov	dx, ax
   836 0000D1DF 7344                <1> 	jnc	short uc_fat12_nc_even
   837                              <1> 
   838 0000D1E1 6683E00F            <1> 	and	ax, 0Fh
   839 0000D1E5 8B0D[088C0100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   840 0000D1EB 66C1E104            <1> 	shl	cx, 4
   841 0000D1EF 6609C1              <1> 	or	cx, ax
   842 0000D1F2 6689D0              <1> 	mov	ax, dx
   843 0000D1F5 66890B              <1> 	mov	[ebx], cx  ; 16 bits !
   844 0000D1F8 66C1E804            <1> 	shr	ax, 4 ; al(bit4..7)+ah(bit0..7)
   845                              <1> 
   846                              <1> update_fat12_buffer:
   847 0000D1FC A3[66890100]        <1> 	mov	[FAT_CurrentCluster], eax
   848 0000D201 89C2                <1> 	mov	edx, eax ; 01/03/2016
   849 0000D203 C605[6A890100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   850 0000D20A 6683F802            <1> 	cmp	ax, 2
   851 0000D20E 0F826AFFFFFF        <1>         jb      return_uc_fat_stc
   852 0000D214 3B05[76890100]      <1> 	cmp	eax, [LastCluster]
   853 0000D21A 0F875EFFFFFF        <1>         ja      return_uc_fat_stc
   854 0000D220 E927FFFFFF          <1>         jmp     loc_fat_buffer_updated
   855                              <1> 
   856                              <1> uc_fat12_nc_even:
   857 0000D225 662500F0            <1> 	and	ax, 0F000h
   858 0000D229 8B0D[088C0100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   859 0000D22F 80E50F              <1> 	and	ch, 0Fh
   860 0000D232 6609C1              <1> 	or	cx, ax
   861 0000D235 6689D0              <1> 	mov	ax, dx
   862 0000D238 66890B              <1> 	mov	[ebx], cx ; 16 bits !
   863 0000D23B 80E40F              <1> 	and	ah, 0Fh ; al(bit0..7)+ah(bit0..3)
   864 0000D23E EBBC                <1> 	jmp	short update_fat12_buffer
   865                              <1> 
   866                              <1> update_fat32_cluster:
   867 0000D240 8B4E78              <1> 	mov	ecx, [esi+LD_Clusters]
   868 0000D243 41                  <1> 	inc	ecx
   869 0000D244 890D[76890100]      <1> 	mov	[LastCluster], ecx
   870                              <1> 
   871 0000D24A 39C8                <1> 	cmp	eax, ecx
   872 0000D24C 0F872CFFFFFF        <1>         ja      return_uc_fat_stc
   873                              <1> 
   874                              <1> pass_uc_fat32_errc:
   875                              <1> 	;sub	edx, edx
   876 0000D252 BB80010000          <1> 	mov	ebx, 180h ;384
   877 0000D257 F7F3                <1> 	div	ebx
   878                              <1> 	; EAX = Count of 3 FAT sectors
   879                              <1> 	; DX = Cluster offset in FAT buffer
   880 0000D259 89D3                <1> 	mov	ebx, edx
   881 0000D25B C1E302              <1> 	shl	ebx, 2 ; Multiply by 4
   882 0000D25E BA03000000          <1> 	mov	edx, 3	
   883 0000D263 F7E2                <1> 	mul	edx
   884                              <1> 	; EBX = Cluster Offset in FAT buffer
   885                              <1> 	; EAX = FAT Sector
   886                              <1> 	; EDX = 0
   887 0000D265 8A0D[6A890100]      <1> 	mov	cl, [FAT_BuffValidData]
   888 0000D26B 80F902              <1> 	cmp	cl, 2
   889 0000D26E 750E                <1> 	jne	short loc_uc_check_fat32_buff_sector_load
   890                              <1> 
   891                              <1> loc_uc_check_fat32_buff_sector_save:
   892 0000D270 3B05[6E890100]      <1> 	cmp	eax, [FAT_BuffSector]
   893 0000D276 0F85E8FEFFFF        <1>         jne     loc_uc_save_fat_buffer
   894 0000D27C EB11                <1> 	jmp	short loc_update_fat32_cell
   895                              <1> 
   896                              <1> loc_uc_check_fat32_buff_sector_load:
   897 0000D27E 80F901              <1> 	cmp	cl, 1 ; byte [FAT_BuffValidData]
   898 0000D281 0F8586000000        <1>         jne     loc_uc_load_fat_sectors
   899 0000D287 3B05[6E890100]      <1> 	cmp	eax, [FAT_BuffSector]
   900 0000D28D 757E                <1>         jne     loc_uc_load_fat_sectors
   901                              <1> 
   902                              <1> loc_update_fat32_cell:
   903                              <1> loc_update_fat32_buffer:
   904 0000D28F 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   905 0000D295 8B03                <1> 	mov	eax, [ebx]
   906 0000D297 25FFFFFF0F          <1> 	and	eax, 0FFFFFFFh ; 28 bit cluster value
   907                              <1> 	
   908 0000D29C 8B15[66890100]      <1> 	mov	edx, [FAT_CurrentCluster] ; 01/03/2016
   909                              <1> 
   910 0000D2A2 A3[66890100]        <1> 	mov 	[FAT_CurrentCluster], eax
   911 0000D2A7 8B0D[088C0100]      <1> 	mov	ecx, [ClusterValue]
   912 0000D2AD 890B                <1> 	mov	[ebx], ecx ; 29/02/2016 
   913                              <1> 
   914 0000D2AF C605[6A890100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   915                              <1> 
   916                              <1> 	; 01/03/2016
   917 0000D2B6 21C0                <1> 	and	eax, eax ; was it free cluster ?
   918 0000D2B8 7514                <1> 	jnz	short loc_upd_fat32_c0
   919                              <1> 
   920                              <1> 	;or	ecx, ecx ; it will be left free ?!
   921                              <1> 	;jz	short loc_upd_fat32_c3
   922                              <1> 
   923 0000D2BA 3B563E              <1> 	cmp	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free cluster
   924 0000D2BD 7520                <1> 	jne	short loc_upd_fat32_c3
   925                              <1> 
   926 0000D2BF 3B15[76890100]      <1> 	cmp	edx, [LastCluster]
   927 0000D2C5 7207                <1> 	jb	short loc_upd_fat32_c0
   928                              <1> 
   929 0000D2C7 BA02000000          <1> 	mov	edx, 2 ; rewind !
   930 0000D2CC EB0E                <1> 	jmp	short loc_upd_fat32_c2
   931                              <1> 
   932                              <1> loc_upd_fat32_c0:
   933 0000D2CE FF463E              <1> 	inc	dword [esi+LD_BPB+BPB_Reserved+4] ; set it to next cluster		
   934 0000D2D1 EB0C                <1> 	jmp	short loc_upd_fat32_c3
   935                              <1> 
   936                              <1> loc_upd_fat32_c1:
   937 0000D2D3 09C9                <1> 	or	ecx, ecx ; will it be free cluster ?
   938 0000D2D5 7508                <1> 	jnz	short loc_upd_fat32_c3
   939                              <1> 
   940 0000D2D7 3B563E              <1> 	cmp	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free cluster
   941 0000D2DA 7303                <1> 	jnb	short loc_upd_fat32_c3
   942                              <1> 
   943                              <1> loc_upd_fat32_c2:	
   944 0000D2DC 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx			
   945                              <1> 
   946                              <1> loc_upd_fat32_c3:
   947 0000D2DF 89C2                <1> 	mov	edx, eax
   948                              <1> 
   949                              <1> loc_upd_fat32_c4:
   950 0000D2E1 83F802              <1> 	cmp	eax, 2
   951 0000D2E4 0F8294FEFFFF        <1>         jb      return_uc_fat_stc
   952                              <1> 
   953                              <1> pass_uc_fat32_c_zero_check_2:
   954 0000D2EA 3B05[76890100]      <1> 	cmp	eax, [LastCluster]
   955 0000D2F0 0F8788FEFFFF        <1>         ja      return_uc_fat_stc
   956                              <1> 	
   957 0000D2F6 E951FEFFFF          <1> 	jmp     loc_fat_buffer_updated
   958                              <1> 
   959                              <1> loc_fat_sectors_rw_error1:
   960                              <1> 	;mov	byte [FAT_BuffValidData], 0
   961                              <1> 	; 23/10/2016 (15h -> 17)
   962                              <1> 	; 23/03/2016
   963 0000D2FB B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
   964 0000D300 8825[6A890100]      <1> 	mov	[FAT_BuffValidData], ah ; 0
   965                              <1> 
   966                              <1> loc_fat_sectors_rw_error2:
   967                              <1> 	;mov	eax, error code
   968                              <1> 	;mov	edx, 0
   969 0000D306 8B0D[088C0100]      <1> 	mov	ecx, [ClusterValue]
   970 0000D30C C3                  <1> 	retn
   971                              <1> 
   972                              <1> loc_uc_load_fat_sectors:
   973 0000D30D A3[6E890100]        <1> 	mov	[FAT_BuffSector], eax
   974                              <1> 
   975                              <1> load_uc_fat_sectors_zero:
   976 0000D312 034660              <1> 	add	eax, [esi+LD_FATBegin]
   977 0000D315 BB001C0900          <1> 	mov	ebx, FAT_Buffer
   978 0000D31A B903000000          <1> 	mov	ecx, 3
   979 0000D31F E8F94F0000          <1> 	call	disk_read
   980 0000D324 72D5                <1> 	jc	short loc_fat_sectors_rw_error1
   981                              <1> 
   982 0000D326 C605[6A890100]01    <1>         mov     byte [FAT_BuffValidData], 1
   983 0000D32D A1[66890100]        <1> 	mov 	eax, [FAT_CurrentCluster]
   984 0000D332 8B0D[088C0100]      <1> 	mov	ecx, [ClusterValue]
   985 0000D338 E972FDFFFF          <1>         jmp     loc_update_cluster_check_fat_type
   986                              <1> 
   987                              <1> save_fat_buffer:
   988                              <1> 	; 15/10/2016
   989                              <1> 	; 01/03/2016
   990                              <1> 	; 22/02/2016 (TRDOS 386 =  TRDOS v2.0)
   991                              <1> 	; 11/08/2011
   992                              <1> 	; 09/02/2005 
   993                              <1> 	; INPUT ->
   994                              <1> 	;	None
   995                              <1> 	; OUTPUT ->
   996                              <1> 	;	cf = 0 -> OK.
   997                              <1> 	;	cf = 1 -> error code in AL (EAX)
   998                              <1> 	;
   999                              <1> 	;	EBX = FAT_Buffer address
  1000                              <1> 	;
  1001                              <1> 	; (EAX, EDX, ECX will be modified)
  1002                              <1> 
  1003                              <1> 	;cmp	byte [FAT_BuffValidData], 2 
  1004                              <1> 	;je	short loc_save_fat_buff
  1005                              <1> 
  1006                              <1> ;loc_save_fat_buffer_retn:
  1007                              <1> ;	xor	eax, eax
  1008                              <1> ;	retn
  1009                              <1> 
  1010                              <1> loc_save_fat_buff:
  1011 0000D33D 31D2                <1> 	xor	edx, edx
  1012 0000D33F 8A35[6B890100]      <1> 	mov	dh, [FAT_BuffDrvName]
  1013 0000D345 80FE41              <1> 	cmp	dh, 'A'
  1014 0000D348 722E                <1> 	jb	short loc_save_fat_buffer_inv_data_retn
  1015 0000D34A 80EE41              <1> 	sub	dh, 'A'
  1016 0000D34D 56                  <1> 	push	esi ; *
  1017 0000D34E BE00010900          <1>         mov     esi, Logical_DOSDisks
  1018 0000D353 01D6                <1> 	add	esi, edx
  1019                              <1> 	
  1020 0000D355 8A5603              <1> 	mov	dl, [esi+LD_FATType]
  1021 0000D358 20D2                <1> 	and	dl, dl
  1022 0000D35A 741B                <1> 	jz	short loc_save_fat_buffer_inv_data_pop_retn 
  1023                              <1> 
  1024 0000D35C A1[6E890100]        <1> 	mov	eax, [FAT_BuffSector]
  1025 0000D361 80FA02              <1> 	cmp	dl, 2
  1026 0000D364 770A                <1> 	ja	short loc_save_fat32_buff
  1027                              <1> 
  1028                              <1> loc_save_fat_12_16_buff:
  1029                              <1> 	; 01/03/2016
  1030                              <1> 	; TRDOS v1 has a FATal bug here!
  1031                              <1> 	; Correct code: mov dx, word ptr [FAT_BuffSector]+2
  1032                              <1> 	; (DX:AX in TRDOS v1 -> EAX in TRDOS v2)
  1033                              <1> 	;
  1034 0000D366 0FB74E1C            <1> 	movzx	ecx, word [esi+LD_BPB+FATSecs] 
  1035 0000D36A 29C1                <1> 	sub	ecx, eax
  1036                              <1> 	; TRDOS v1 has a bug here... ('pop esi' was forgotten!)
  1037                              <1> 	;jna	short loc_save_fat_buffer_inv_data_retn ; wrong addr!
  1038 0000D36C 7609                <1> 	jna	short loc_save_fat_buffer_inv_data_pop_retn ; correct addr.
  1039 0000D36E EB15                <1> 	jmp	short loc_save_fat_buffer_check_rs3
  1040                              <1> 
  1041                              <1> loc_save_fat32_buff:
  1042 0000D370 8B4E2A              <1> 	mov	ecx, [esi+LD_BPB+FAT32_FAT_Size]
  1043 0000D373 29C1                <1> 	sub	ecx, eax
  1044 0000D375 770E                <1> 	ja	short loc_save_fat_buffer_check_rs3
  1045                              <1> 
  1046                              <1> loc_save_fat_buffer_inv_data_pop_retn:
  1047 0000D377 5E                  <1> 	pop	esi ; *
  1048                              <1> loc_save_fat_buffer_inv_data_retn:
  1049 0000D378 B80D000000          <1> 	mov	eax, 0Dh ; Invalid DATA
  1050 0000D37D C3                  <1> 	retn
  1051                              <1> 
  1052                              <1> loc_save_fat_buff_remain_sectors_3:
  1053 0000D37E B903000000          <1> 	mov	ecx, 3
  1054 0000D383 EB05                <1> 	jmp	short loc_save_fat_buff_continue
  1055                              <1> 
  1056                              <1> loc_save_fat_buffer_check_rs3:
  1057 0000D385 83F903              <1> 	cmp	ecx, 3
  1058 0000D388 77F4                <1> 	ja	short loc_save_fat_buff_remain_sectors_3
  1059                              <1> 
  1060                              <1> loc_save_fat_buff_continue:
  1061 0000D38A BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1062 0000D38F 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1063 0000D392 51                  <1> 	push	ecx
  1064 0000D393 E8764F0000          <1> 	call	disk_write
  1065 0000D398 59                  <1> 	pop	ecx
  1066 0000D399 722B                <1> 	jc	short loc_save_FAT_buff_write_err
  1067                              <1> 	
  1068 0000D39B 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1069 0000D39F 7605                <1> 	jna	short loc_calc_2nd_fat12_16_addr
  1070                              <1> 
  1071                              <1> loc_calc_2nd_fat32_addr:
  1072 0000D3A1 8B462A              <1> 	mov	eax, [esi+LD_BPB+FAT32_FAT_Size]
  1073 0000D3A4 EB04                <1> 	jmp	short loc_calc_2nd_fat_addr
  1074                              <1> 
  1075                              <1> loc_calc_2nd_fat12_16_addr:
  1076 0000D3A6 0FB7461C            <1> 	movzx	eax, word [esi+LD_BPB+FATSecs]
  1077                              <1> 
  1078                              <1> loc_calc_2nd_fat_addr:
  1079 0000D3AA 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1080 0000D3AD 0305[6E890100]      <1> 	add	eax, [FAT_BuffSector]
  1081 0000D3B3 BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1082                              <1> 	; ecx = 1 to 3
  1083 0000D3B8 E8514F0000          <1> 	call	disk_write
  1084 0000D3BD 7207                <1> 	jc	short loc_save_FAT_buff_write_err
  1085                              <1>  	; Valid  buffer (1 = valid but do not save)
  1086 0000D3BF C605[6A890100]01    <1> 	mov	byte [FAT_BuffValidData], 1
  1087                              <1> 
  1088                              <1> loc_save_FAT_buff_write_err:
  1089 0000D3C6 5E                  <1> 	pop	esi ; *
  1090 0000D3C7 BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1091                              <1> 	; 15/10/2016 (1Dh -> 18)
  1092                              <1> 	; 23/03/2016 (1Dh)
  1093 0000D3CC B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error
  1094 0000D3D1 C3                  <1> 	retn
  1095                              <1> 
  1096                              <1> calculate_fat_freespace:
  1097                              <1> 	; 23/03/2016
  1098                              <1> 	; 02/03/2016
  1099                              <1> 	; 01/03/2016
  1100                              <1> 	; 29/02/2016
  1101                              <1> 	; 22/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1102                              <1> 	; 30/04/2011
  1103                              <1> 	; 03/04/2010
  1104                              <1> 	; 2005
  1105                              <1> 	; INPUT ->
  1106                              <1> 	;	EAX = Cluster count to be added or subtracted
  1107                              <1> 	; 	If BH = FFh, ESI = TR-DOS Logical Drive Description Table
  1108                              <1> 	; 	If BH < FFh, BH = TR-DOS Logical Drive Number
  1109                              <1> 	; 	BL: 
  1110                              <1> 	;	0 = Calculate, 1 = Add, 2 = Subtract, 3 = Get (Not Set/Calc)
  1111                              <1> 	; OUTPUT ->
  1112                              <1> 	;	EAX = Free Space in sectors
  1113                              <1> 	;	ESI = Logical Dos Drive Description Table address
  1114                              <1> 	;	BH = Logical Dos Drive Number (same with input value of BH)
  1115                              <1> 	;	BL = Type of operation (same with input value of BL)
  1116                              <1> 	;	ECX = 0 -> valid
  1117                              <1> 	;	ECX > 0 -> error or invalid
  1118                              <1> 	;	If EAX = FFFFFFFFh, it is 're-calculation needed'
  1119                              <1> 	;			          sign due to r/w error   
  1120                              <1> 
  1121 0000D3D2 66891D[0E8C0100]    <1> 	mov	[CFS_OPType], bx
  1122 0000D3D9 A3[108C0100]        <1> 	mov	[CFS_CC], eax
  1123                              <1> 	
  1124 0000D3DE 80FFFF              <1> 	cmp	bh, 0FFh
  1125 0000D3E1 740B                <1> 	je	short pass_calculate_freespace_get_drive_dt_offset
  1126                              <1> 
  1127                              <1> loc_calculate_freespace_get_drive_dt_offset:     
  1128 0000D3E3 31C0                <1> 	xor	eax, eax
  1129 0000D3E5 88FC                <1>         mov     ah, bh
  1130 0000D3E7 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1131 0000D3EC 01C6                <1>         add     esi, eax
  1132                              <1> 
  1133                              <1> pass_calculate_freespace_get_drive_dt_offset:
  1134 0000D3EE 08DB                <1> 	or	bl, bl
  1135 0000D3F0 7435                <1> 	jz	short loc_reset_fcc
  1136                              <1> 	
  1137                              <1> loc_get_free_sectors:
  1138 0000D3F2 8B4674              <1> 	mov	eax, [esi+LD_FreeSectors]
  1139                              <1> 
  1140                              <1> 	;xor	ecx, ecx
  1141                              <1> 	;dec	ecx ; 0FFFFFFFFh
  1142                              <1> 	;cmp	eax, ecx ; 29/02/2016
  1143                              <1> 	;je	short loc_get_free_sectors_retn ; recalculation is needed!
  1144                              <1> 	
  1145                              <1> 	; 23/03/2016
  1146 0000D3F5 8B4E70              <1> 	mov	ecx, [esi+LD_TotalSectors]
  1147 0000D3F8 39C1                <1> 	cmp	ecx, eax ; Total sectors must be greater than Free sectors !
  1148 0000D3FA 7707                <1> 	ja	short loc_get_free_sectors_check_optype
  1149                              <1> 	
  1150 0000D3FC 31C0                <1> 	xor	eax, eax
  1151 0000D3FE 48                  <1> 	dec	eax ; 0FFFFFFFFh  ; recalculation is needed!
  1152 0000D3FF 894674              <1> 	mov	[esi+LD_FreeSectors], eax ; reset (for recalculation)
  1153                              <1> 		
  1154                              <1> loc_get_free_sectors_retn:
  1155 0000D402 C3                  <1> 	retn
  1156                              <1> 	
  1157                              <1> loc_get_free_sectors_check_optype:
  1158 0000D403 80FB03              <1> 	cmp	bl, 3
  1159 0000D406 7203                <1> 	jb	short loc_set_fcc
  1160                              <1> 
  1161 0000D408 29C9                <1> 	sub	ecx, ecx ; 0
  1162                              <1> 
  1163 0000D40A C3                  <1> 	retn	
  1164                              <1> 
  1165                              <1> loc_set_fcc:
  1166 0000D40B 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1167 0000D40F 0F87DF000000        <1>         ja      loc_update_FAT32_fs_info_fcc
  1168                              <1> 
  1169                              <1> 	;mov	eax, [esi+LD_FreeSectors]
  1170 0000D415 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  1171 0000D419 29D2                <1> 	sub	edx, edx
  1172 0000D41B F7F1                <1> 	div	ecx
  1173                              <1> 	;or	dx, dx 
  1174                              <1> 	;	; DX -> Remain sectors < SecPerClust
  1175                              <1> 	;	; DX > 0 -> invalid free sector count
  1176                              <1> 	;jnz	short loc_reset_fcc 
  1177                              <1> 
  1178                              <1> ;pass_set_fcc_div32:
  1179 0000D41D A3[87890100]        <1> 	mov	[FreeClusterCount], eax
  1180 0000D422 E988000000          <1>         jmp     loc_set_free_sectors_FAT12_FAT16
  1181                              <1> 
  1182                              <1> loc_reset_fcc:
  1183 0000D427 31C0                <1> 	xor	eax, eax
  1184 0000D429 A3[87890100]        <1> 	mov	[FreeClusterCount], eax ; 0
  1185 0000D42E 8B5678              <1> 	mov	edx, [esi+LD_Clusters]
  1186 0000D431 42                  <1> 	inc	edx
  1187 0000D432 8915[76890100]      <1> 	mov	[LastCluster], edx
  1188                              <1> 
  1189 0000D438 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1190 0000D43C 7647                <1> 	jna	short loc_count_free_fat_clusters_0  
  1191                              <1> 
  1192 0000D43E 48                  <1> 	dec	eax ; FFFFFFFFh
  1193 0000D43F A3[188C0100]        <1> 	mov	[CFS_FAT32FC], eax
  1194                              <1> 
  1195                              <1> 	; 29/02/2016
  1196 0000D444 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; reset
  1197 0000D447 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; reset
  1198                              <1> 	
  1199 0000D44A B802000000          <1> 	mov 	eax, 2
  1200                              <1> 
  1201                              <1> loc_count_fc_next_cluster_0:
  1202 0000D44F 50                  <1> 	push	eax
  1203 0000D450 E801F9FFFF          <1> 	call	get_next_cluster
  1204 0000D455 7310                <1> 	jnc	short loc_check_fat32_ff_cluster
  1205 0000D457 09C0                <1> 	or	eax, eax
  1206 0000D459 741E                <1> 	jz	short pass_inc_cfs_fcc_0
  1207                              <1> 
  1208                              <1> loc_put_fcc_unknown_sign:
  1209 0000D45B 58                  <1> 	pop	eax
  1210                              <1> 	; "Free count is Unknown" sign
  1211                              <1> 	;mov	dword [FreeClusterCount], 0FFFFFFFFh
  1212                              <1> 
  1213                              <1> 	; 29/02/2016
  1214                              <1> 	; Save Free Cluster Count value in FAT32 'BPB_Reserved' area
  1215                              <1> 	;mov	[esi+LD_BPB+BPB_Reserved], 0FFFFFFFFh ; unknown!
  1216 0000D45C 8B15[188C0100]      <1> 	mov	edx, [CFS_FAT32FC] ; First Free Cluster
  1217                              <1> 	; Save First Free Cluster value in FAT32 'BPB_Reserved+4' area
  1218 0000D462 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx
  1219                              <1> 	
  1220 0000D465 EB7D                <1>         jmp     loc_put_fcc_invalid_sign
  1221                              <1> 
  1222                              <1> loc_check_fat32_ff_cluster:
  1223 0000D467 09C0                <1> 	or	eax, eax
  1224 0000D469 750E                <1> 	jnz	short pass_inc_cfs_fcc_0
  1225 0000D46B 58                  <1> 	pop	eax
  1226 0000D46C A3[188C0100]        <1> 	mov	[CFS_FAT32FC], eax
  1227                              <1> 	;mov	dword [FreeClusterCount], 1
  1228 0000D471 FF05[87890100]      <1> 	inc	dword [FreeClusterCount]
  1229 0000D477 EB27                <1> 	jmp	short pass_inc_cfs_fcc_1
  1230                              <1> 
  1231                              <1> pass_inc_cfs_fcc_0:
  1232 0000D479 58                  <1> 	pop	eax
  1233                              <1> 
  1234                              <1> pass_inc_cfs_fcc_0c:
  1235 0000D47A 40                  <1> 	inc	eax ; add eax, 1
  1236 0000D47B 3B05[76890100]      <1> 	cmp	eax, [LastCluster]
  1237 0000D481 76CC                <1> 	jna 	short loc_count_fc_next_cluster_0
  1238 0000D483 EB6F                <1> 	jmp	short loc_update_FAT32_fs_info_fcc
  1239                              <1> 
  1240                              <1> loc_count_free_fat_clusters_0:
  1241                              <1> 	;mov	eax, 2
  1242 0000D485 B002                <1> 	mov	al, 2
  1243                              <1> 
  1244                              <1> loc_count_fc_next_cluster:
  1245 0000D487 50                  <1> 	push	eax
  1246 0000D488 E8C9F8FFFF          <1> 	call	get_next_cluster
  1247 0000D48D 720C                <1> 	jc	short loc_count_fcc_stc
  1248                              <1> 
  1249                              <1> loc_count_free_clusters_1:
  1250 0000D48F 21C0                <1> 	and	eax, eax
  1251 0000D491 750C                <1> 	jnz	short pass_inc_cfs_fcc
  1252                              <1> 
  1253 0000D493 FF05[87890100]      <1> 	inc	dword [FreeClusterCount]
  1254 0000D499 EB04                <1> 	jmp	short pass_inc_cfs_fcc
  1255                              <1> 
  1256                              <1> loc_count_fcc_stc:
  1257 0000D49B 09C0                <1> 	or	eax, eax
  1258 0000D49D 75BC                <1> 	jnz	short loc_put_fcc_unknown_sign ; 29/02/2016
  1259                              <1> 
  1260                              <1> pass_inc_cfs_fcc:
  1261 0000D49F 58                  <1> 	pop	eax
  1262                              <1> 
  1263                              <1> pass_inc_cfs_fcc_1:
  1264 0000D4A0 40                  <1> 	inc	eax ; add eax, 1
  1265 0000D4A1 3B05[76890100]      <1> 	cmp	eax, [LastCluster]
  1266 0000D4A7 76DE                <1> 	jna	short loc_count_fc_next_cluster
  1267                              <1> 
  1268                              <1> loc_set_free_sectors:
  1269 0000D4A9 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1270 0000D4AD 7745                <1> 	ja	short loc_update_FAT32_fs_info_fcc
  1271                              <1> 
  1272                              <1> loc_set_free_sectors_FAT12_FAT16:
  1273 0000D4AF 803D[0E8C0100]00    <1> 	cmp	byte [CFS_OPType], 0
  1274 0000D4B6 761C                <1> 	jna	short pass_FAT_add_sub_fcc
  1275 0000D4B8 A1[108C0100]        <1> 	mov	eax, [CFS_CC]
  1276 0000D4BD 803D[0E8C0100]01    <1> 	cmp	byte [CFS_OPType], 1
  1277 0000D4C4 7708                <1> 	ja	short pass_FAT_add_fcc
  1278 0000D4C6 0105[87890100]      <1> 	add 	[FreeClusterCount], eax
  1279 0000D4CC EB06                <1> 	jmp	short pass_FAT_add_sub_fcc
  1280                              <1> 
  1281                              <1> pass_FAT_add_fcc:
  1282 0000D4CE 2905[87890100]      <1> 	sub	[FreeClusterCount], eax
  1283                              <1> 
  1284                              <1> pass_FAT_add_sub_fcc:
  1285 0000D4D4 0FB64613            <1> 	movzx	eax, byte [esi+LD_BPB+SecPerClust]
  1286 0000D4D8 8B15[87890100]      <1> 	mov	edx, [FreeClusterCount]
  1287 0000D4DE F7E2                <1> 	mul	edx
  1288                              <1> 
  1289 0000D4E0 31C9                <1> 	xor	ecx, ecx 
  1290 0000D4E2 EB05                <1> 	jmp	short loc_cfs_retn_params
  1291                              <1> 
  1292                              <1> loc_put_fcc_invalid_sign:
  1293 0000D4E4 29C0                <1>        	sub	eax, eax ; 0
  1294 0000D4E6 48                  <1> 	dec	eax ; FFFFFFFFh
  1295                              <1> loc_fat32_ffc_recalc_needed:
  1296 0000D4E7 89C1                <1> 	mov	ecx, eax
  1297                              <1> 
  1298                              <1> loc_cfs_retn_params:
  1299 0000D4E9 894674              <1> 	mov 	[esi+LD_FreeSectors], eax
  1300 0000D4EC 0FB71D[0E8C0100]    <1> 	movzx	ebx, word [CFS_OPType]
  1301 0000D4F3 C3                  <1> 	retn
  1302                              <1> 
  1303                              <1> loc_update_FAT32_fs_info_fcc:
  1304                              <1> loc_check_fcc_FSINFO_op:
  1305                              <1> 	; 29/02/2016
  1306                              <1> 	; EAX = Free cluster count (before this update) ; value from disk
  1307                              <1> 	; EDX = First Free Cluster (before this update) ; value from disk
  1308 0000D4F4 803D[0E8C0100]01    <1> 	cmp	byte [CFS_OPType], 1
  1309 0000D4FB 7221                <1> 	jb	short loc_cfs_FAT32_get_rcalc_parms ; 0 = recalculated
  1310 0000D4FD 7406                <1> 	je	short loc_check_fcc_FSINFO_op1 ; 1 = add
  1311                              <1> loc_check_fcc_FSINFO_op2: ; subtract
  1312 0000D4FF F71D[108C0100]      <1> 	neg	dword [CFS_CC] ; prepare to subtract ; 2 = sub (add negative)
  1313                              <1> loc_check_fcc_FSINFO_op1:
  1314                              <1> 	; 01/03/2016
  1315 0000D505 31D2                <1> 	xor	edx, edx ; 0
  1316 0000D507 4A                  <1> 	dec	edx ; 0FFFFFFFFh
  1317 0000D508 8B463A              <1> 	mov	eax, [esi+LD_BPB+BPB_Reserved]
  1318 0000D50B 39D0                <1> 	cmp	eax, edx
  1319 0000D50D 73D5                <1> 	jnb	short loc_put_fcc_invalid_sign
  1320 0000D50F 0305[108C0100]      <1>         add     eax, [CFS_CC] ; free cluster count on disk + current count
  1321 0000D515 72CD                <1> 	jc	short loc_put_fcc_invalid_sign
  1322                              <1> 	
  1323 0000D517 A3[87890100]        <1> 	mov	[FreeClusterCount], eax
  1324 0000D51C EB0E                <1> 	jmp	short loc_cfs_write_FSINFO_sector
  1325                              <1> 
  1326                              <1> loc_cfs_FAT32_get_rcalc_parms:
  1327 0000D51E 8B15[188C0100]      <1> 	mov	edx, [CFS_FAT32FC]
  1328 0000D524 A1[87890100]        <1> 	mov	eax, [FreeClusterCount]
  1329 0000D529 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx ; First Free Cluster
  1330                              <1> loc_cfs_write_FSINFO_sector:
  1331 0000D52C 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count
  1332                              <1> 	; 01/03/2016
  1333 0000D52F E8AA000000          <1> 	call	set_fat32_fsinfo_sector_parms
  1334 0000D534 72AE                <1>         jc      short loc_put_fcc_invalid_sign
  1335                              <1> 
  1336                              <1> loc_set_FAT32_free_sectors:
  1337                              <1> 	; 29/02/2016
  1338                              <1> 	;mov	eax, [FreeClusterCount]
  1339                              <1> 	;mov	ecx, eax
  1340                              <1> 	;cmp	eax, 0FFFFFFFFh ; Invalid !
  1341                              <1> 	;je	short loc_cfs_retn_params
  1342                              <1> 	;
  1343 0000D536 8B0D[87890100]      <1> 	mov	ecx, [FreeClusterCount]
  1344 0000D53C 0FB64613            <1> 	movzx	eax, byte [esi+LD_BPB+SecPerClust]
  1345 0000D540 F7E1                <1> 	mul	ecx
  1346                              <1> 	; 29/02/2016
  1347 0000D542 31C9                <1> 	xor	ecx, ecx ; 0
  1348 0000D544 09D2                <1> 	or	edx, edx ; 0 ?
  1349 0000D546 759C                <1>         jnz     loc_put_fcc_invalid_sign
  1350 0000D548 394670              <1> 	cmp	[esi+LD_TotalSectors], eax ; Volume size in sectors
  1351 0000D54B 7697                <1>         jna     short loc_put_fcc_invalid_sign
  1352                              <1> 	;
  1353                              <1> loc_set_FAT32_free_sectors_ok:
  1354 0000D54D 31D2                <1> 	xor	edx, edx ; 0
  1355 0000D54F EB98                <1>         jmp     short loc_cfs_retn_params 
  1356                              <1> 	;
  1357                              <1> 
  1358                              <1> get_last_cluster:
  1359                              <1> 	; 22/10/2016
  1360                              <1> 	; 27/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1361                              <1> 	; 12/06/2010 (DRV_FAT.ASM, 'proc_get_last_custer')
  1362                              <1> 	; 06/06/2010
  1363                              <1> 	; INPUT ->
  1364                              <1> 	;	EAX = First Cluster Number
  1365                              <1> 	; 	ESI = Logical Dos Drive Parameters Table
  1366                              <1> 	; OUTPUT ->
  1367                              <1> 	;	cf = 0 -> No Error, EAX is valid
  1368                              <1> 	;	cf = 1 -> EAX > 0 -> Error
  1369                              <1> 	;	EAX = Last Cluster Number
  1370                              <1> 	;       ECX = Previous Cluster -just before the last cluster-
  1371                              <1> 	;       ; 22/10/2016
  1372                              <1> 	;	[glc_index] = cluster index number of the last cluster	
  1373                              <1> 	;
  1374                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
  1375                              <1> 
  1376 0000D551 89C1                <1> 	mov	ecx, eax
  1377                              <1> 
  1378 0000D553 C705[208C0100]FFFF- <1> 	mov	dword [glc_index], 0FFFFFFFFh ; 22/10/2016	
  1378 0000D55B FFFF                <1>
  1379                              <1> 
  1380                              <1> loc_glc_get_next_cluster_1:
  1381 0000D55D 890D[1C8C0100]      <1> 	mov	[glc_prevcluster], ecx
  1382                              <1>  	; 22/10/2016
  1383 0000D563 FF05[208C0100]      <1> 	inc	dword [glc_index]
  1384                              <1> 
  1385                              <1> loc_glc_get_next_cluster_2:
  1386 0000D569 E8E8F7FFFF          <1> 	call	get_next_cluster
  1387                              <1> 	; ecx = current/previous cluster 
  1388                              <1> 	; eax = next/last cluster
  1389 0000D56E 73ED                <1> 	jnc	short loc_glc_get_next_cluster_1
  1390                              <1> 
  1391 0000D570 09C0                <1> 	or	eax, eax
  1392 0000D572 7509                <1> 	jnz	short loc_glc_stc_retn
  1393                              <1> 
  1394                              <1> 	; ecx = previous cluster
  1395 0000D574 89C8                <1>         mov	eax, ecx
  1396                              <1> 
  1397                              <1> 	; previous cluster becomes last cluster (ecx -> eax)
  1398                              <1> 	; previous of previous cluster becomes previous cluster (ecx)
  1399                              <1> 
  1400                              <1> loc_glc_prev_cluster_retn:
  1401 0000D576 8B0D[1C8C0100]      <1> 	mov	ecx, [glc_prevcluster] 
  1402 0000D57C C3                  <1> 	retn
  1403                              <1> 
  1404                              <1> loc_glc_stc_retn:
  1405 0000D57D F5                  <1> 	cmc	;stc
  1406 0000D57E EBF6                <1>         jmp	short loc_glc_prev_cluster_retn
  1407                              <1> 
  1408                              <1> truncate_cluster_chain:
  1409                              <1> 	; 01/03/2016
  1410                              <1> 	; 28/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1411                              <1> 	; 22/01/2011 (DRV_FAT.ASM, 'proc_truncate_cluster_chain')
  1412                              <1> 	; 11/09/2010
  1413                              <1> 	; INPUT ->
  1414                              <1> 	;	ESI = Logical dos drive description table address
  1415                              <1> 	;	EAX = First cluster to be truncated/unlinked 
  1416                              <1> 	; OUTPUT ->
  1417                              <1> 	;	ESI = Logical dos drive description table address
  1418                              <1> 	; 	ECX = Count of truncated/removed clusters
  1419                              <1> 	; 	CF = 0 -> EAX = Free sectors
  1420                              <1> 	; 	CF = 1 -> Error code in EAX (AL)
  1421                              <1> 
  1422                              <1> 	; NOTE: This procedure does not update lm date&time ! 
  1423                              <1> 
  1424                              <1> loc_truncate_cc:	
  1425 0000D580 31C9                <1> 	xor	ecx, ecx ; mov ecx, 0
  1426                              <1> 	;mov	byte [FAT_BuffValidData], 0
  1427 0000D582 890D[72890100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; reset
  1428                              <1> 
  1429                              <1> loc_tcc_unlink_clusters:
  1430 0000D588 E8F3FAFFFF          <1> 	call	update_cluster
  1431                              <1> 	; EAX = Next Cluster
  1432                              <1> 	; ECX = Cluster Value
  1433                              <1> 	; Note:
  1434                              <1> 	; Returns count of unlinked clusters in
  1435                              <1> 	; dword ptr FAT_ClusterCounter
  1436 0000D58D 73F9                <1> 	jnc short loc_tcc_unlink_clusters
  1437                              <1> 
  1438                              <1> pass_tcc_unlink_clusters:
  1439 0000D58F A2[278C0100]        <1> 	mov	byte [TCC_FATErr], al
  1440 0000D594 803D[6A890100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
  1441 0000D59B 750E                <1> 	jne	short loc_tcc_calculate_FAT_freespace
  1442 0000D59D E89BFDFFFF          <1> 	call	save_fat_buffer
  1443 0000D5A2 7307                <1> 	jnc	short loc_tcc_calculate_FAT_freespace
  1444 0000D5A4 A2[278C0100]        <1> 	mov	byte [TCC_FATErr], al ; Error
  1445                              <1> 	;mov	byte [FAT_BuffValidData], 0
  1446                              <1> 
  1447                              <1> 	; 01/03/2016
  1448 0000D5A9 EB12                <1> 	jmp	short loc_tcc_recalculate_FAT_freespace
  1449                              <1> 
  1450                              <1> loc_tcc_calculate_FAT_freespace:
  1451 0000D5AB A1[72890100]        <1> 	mov	eax, [FAT_ClusterCounter] ; signed (+-) number
  1452 0000D5B0 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> ESI = Dos drv desc. table
  1453                              <1> 			   ; BL = 1 -> add cluster
  1454 0000D5B4 E819FEFFFF          <1> 	call	calculate_fat_freespace
  1455 0000D5B9 21C9                <1> 	and	ecx, ecx ; cx = 0 -> valid free sector count
  1456 0000D5BB 7409                <1> 	jz	short pass_truncate_cc_recalc_FAT_freespace
  1457                              <1> 
  1458                              <1> loc_tcc_recalculate_FAT_freespace:
  1459 0000D5BD 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate !
  1460 0000D5C1 E80CFEFFFF          <1> 	call	calculate_fat_freespace
  1461                              <1>               
  1462                              <1> loc_tcc_calculate_FAT_freespace_err:
  1463                              <1> pass_truncate_cc_recalc_FAT_freespace:
  1464 0000D5C6 8B0D[72890100]      <1> 	mov	ecx, [FAT_ClusterCounter]
  1465                              <1> 
  1466 0000D5CC 803D[278C0100]00    <1> 	cmp	byte [TCC_FATErr], 0
  1467 0000D5D3 7608                <1> 	jna	short loc_tcc_unlink_clusters_retn
  1468                              <1> 
  1469                              <1> loc_tcc_unlink_clusters_error:
  1470 0000D5D5 0FB605[278C0100]    <1> 	movzx	eax, byte [TCC_FATErr]
  1471 0000D5DC F9                  <1> 	stc
  1472                              <1> loc_tcc_unlink_clusters_retn:
  1473 0000D5DD C3                  <1> 	retn
  1474                              <1> 
  1475                              <1> set_fat32_fsinfo_sector_parms:
  1476                              <1> 	; 15/10/2016
  1477                              <1> 	; 23/03/2016
  1478                              <1> 	; 29/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1479                              <1> 	; INPUT ->
  1480                              <1> 	;	ESI = Logical dos drive description table address
  1481                              <1> 	;	[esi+LD_BPB+BPB_Reserved] = Free Cluster Count
  1482                              <1> 	;	[esi+LD_BPB+BPB_Reserved+4] = First Free Cluster 
  1483                              <1> 	; OUTPUT ->
  1484                              <1> 	;	ESI = Logical dos drive description table address
  1485                              <1> 	; 	CF = 0 -> OK..
  1486                              <1> 	; 	CF = 1 -> Error code in EAX (AL)
  1487                              <1> 	;
  1488                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX)
  1489                              <1> 
  1490 0000D5DE E824000000          <1> 	call	get_fat32_fsinfo_sector_parms
  1491 0000D5E3 7221                <1> 	jc	short update_fat32_fsinfo_sector_retn
  1492                              <1> 
  1493 0000D5E5 8B463A              <1> 	mov	eax, [esi+LD_BPB+BPB_Reserved] ; Free Cluster Count
  1494 0000D5E8 8B563E              <1> 	mov	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free Cluster	
  1495                              <1> 
  1496                              <1>         ;mov	ebx, DOSBootSectorBuff
  1497 0000D5EB 8983E8010000        <1> 	mov	[ebx+488], eax
  1498 0000D5F1 8993EC010000        <1> 	mov	[ebx+492], edx	
  1499                              <1> 
  1500 0000D5F7 A1[148C0100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC]
  1501 0000D5FC B901000000          <1> 	mov	ecx, 1
  1502 0000D601 E8084D0000          <1> 	call	disk_write
  1503                              <1> 	;jnc     short update_fat32_fsinfo_sector_retn
  1504                              <1> 
  1505                              <1> 	; 15/10/2016 (1Dh -> 18)
  1506                              <1> 	; 23/03/2016 (1Dh)
  1507                              <1> 	;mov	eax, 18 ; Drive not ready or write error
  1508                              <1> 
  1509                              <1> update_fat32_fsinfo_sector_retn:
  1510 0000D606 C3                  <1> 	retn
  1511                              <1> 
  1512                              <1> get_fat32_fsinfo_sector_parms:
  1513                              <1> 	; 15/10/2016
  1514                              <1> 	; 23/03/2016
  1515                              <1> 	; 01/03/2016
  1516                              <1> 	; 29/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1517                              <1> 	; INPUT ->
  1518                              <1> 	;	ESI = Logical dos drive description table address
  1519                              <1> 	; OUTPUT ->
  1520                              <1> 	;	ESI = Logical dos drive description table address
  1521                              <1> 	;	EBX = FSINFO sector buffer address (DOSBootSectorBuff)	
  1522                              <1> 	;	CF = 0 -> OK..
  1523                              <1> 	;	   EAX = FsInfo sector address
  1524                              <1> 	;	   ECX = Free cluster count
  1525                              <1> 	;	   EDX = First free cluster 	
  1526                              <1> 	;	CF = 1 -> Error code in AL (EAX)
  1527                              <1> 	;	   EBX = 0
  1528                              <1> 	;	
  1529                              <1> 	;	[CFS_FAT32FSINFOSEC] = FAT32 FSINFO sector address
  1530                              <1>         ;
  1531                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX)
  1532                              <1> 
  1533 0000D607 0FB74636            <1> 	movzx	eax, word [esi+LD_BPB+FAT32_FSInfoSec]
  1534 0000D60B 03466C              <1> 	add	eax, [esi+LD_StartSector]
  1535 0000D60E A3[148C0100]        <1> 	mov	[CFS_FAT32FSINFOSEC], eax
  1536                              <1> 	
  1537 0000D613 BB[66870100]        <1>         mov     ebx, DOSBootSectorBuff
  1538 0000D618 B901000000          <1> 	mov	ecx, 1
  1539 0000D61D E8FB4C0000          <1> 	call	disk_read
  1540 0000D622 7232                <1> 	jc	short loc_read_FAT32_fsinfo_sec_err
  1541                              <1> 
  1542 0000D624 BB[66870100]        <1> 	mov	ebx, DOSBootSectorBuff
  1543                              <1> 
  1544 0000D629 813B52526141        <1> 	cmp	dword [ebx], 41615252h
  1545 0000D62F 751E                <1> 	jne	short loc_read_FAT32_fsinfo_sec_stc
  1546                              <1> 
  1547 0000D631 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
  1547 0000D63A 61                  <1>
  1548 0000D63B 7512                <1> 	jne	short loc_read_FAT32_fsinfo_sec_stc
  1549                              <1> 
  1550 0000D63D A1[148C0100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC]
  1551 0000D642 8B8BE8010000        <1> 	mov	ecx, [ebx+488] ; free cluster count
  1552 0000D648 8B93EC010000        <1> 	mov	edx, [ebx+492] ; first (next) free cluster	
  1553                              <1> 
  1554 0000D64E C3                  <1> 	retn
  1555                              <1> 
  1556                              <1> loc_read_FAT32_fsinfo_sec_stc: 
  1557                              <1> 	; 15/10/2016 (0Bh -> 28)
  1558 0000D64F B81C000000          <1> 	mov	eax, 28 ; Invalid format!
  1559 0000D654 EB05                <1> 	jmp	short loc_read_FAT32_fsinfo_sec_stc_retn
  1560                              <1> 
  1561                              <1> loc_read_FAT32_fsinfo_sec_err:
  1562                              <1> 	; 15/10/2016 (15h -> 17)
  1563                              <1> 	; 23/03/2016 (15h)
  1564 0000D656 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
  1565                              <1> 
  1566                              <1> loc_read_FAT32_fsinfo_sec_stc_retn:
  1567 0000D65B 29DB                <1> 	sub	ebx, ebx ; 0
  1568 0000D65D F9                  <1> 	stc
  1569 0000D65E C3                  <1> 	retn
  1570                              <1> 
  1571                              <1> add_new_cluster:
  1572                              <1> 	; 15/10/2016
  1573                              <1> 	; 16/05/2016
  1574                              <1> 	; 18/03/2016, 24/03/2016
  1575                              <1> 	; 11/03/2016 (TRDOS 386 =  TRDOS v2.0)
  1576                              <1> 	; 30/07/2011 (DRV_FAT.ASM)
  1577                              <1> 	; 11/09/2010
  1578                              <1> 	; INPUT ->
  1579                              <1> 	;	ESI = Logical dos drv desc. table address
  1580                              <1> 	;	EAX = Last cluster
  1581                              <1> 	; OUTPUT ->
  1582                              <1> 	;	ESI = Logical dos drv desc. table address
  1583                              <1> 	;	EAX = New Last cluster (next cluster)
  1584                              <1> 	;	cf = 1 -> error code in EAX (AL)
  1585                              <1> 	;	cf = 1 -> DX = sectors per cluster
  1586                              <1> 	;	ECX = Free sectors
  1587                              <1> 	; NOTE:
  1588                              <1> 	; This procedure does not update lm date&time !
  1589                              <1> 	;
  1590                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, EDI)
  1591                              <1> 	;
  1592                              <1> 
  1593 0000D65F A3[448D0100]        <1> 	mov	[FAT_anc_LCluster], eax
  1594                              <1> 	
  1595 0000D664 E844F9FFFF          <1> 	call	get_first_free_cluster
  1596 0000D669 720B                <1> 	jc	short loc_add_new_cluster_retn
  1597                              <1> 	; EAX >= 2 and EAX < FFFFFFFFh is valid
  1598                              <1> 
  1599 0000D66B 89C2                <1> 	mov	edx, eax
  1600                              <1> 
  1601 0000D66D 42                  <1> 	inc	edx
  1602                              <1> 	;jnz	short loc_add_new_cluster_check_ffc_eax
  1603 0000D66E 7516                <1> 	jnz	short loc_add_new_cluster_save_fcc
  1604                              <1> 
  1605                              <1> loc_add_new_cluster_no_disk_space_retn:
  1606 0000D670 B827000000          <1> 	mov	eax, 27h ; MSDOS err => insufficient disk space
  1607                              <1> loc_add_new_cluster_stc_retn:
  1608 0000D675 F9                  <1> 	stc
  1609                              <1> loc_add_new_cluster_retn:
  1610 0000D676 0FB65E13            <1> 	movzx	ebx, byte [esi+LD_BPB+SecPerClust]
  1611 0000D67A 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  1612                              <1> 	;xor	edx, edx
  1613                              <1> 	;stc
  1614 0000D67D C3                  <1> 	retn
  1615                              <1> 
  1616                              <1> loc_anc_invalid_format_stc_retn:
  1617 0000D67E F9                  <1> 	stc
  1618                              <1> loc_add_new_cluster_invalid_format_retn:
  1619                              <1> 	; 15/10/2016 (0Bh -> 28)
  1620 0000D67F B81C000000          <1> 	mov	eax, 28 ; Invalid format
  1621 0000D684 EBF0                <1> 	jmp	short loc_add_new_cluster_retn 
  1622                              <1> 
  1623                              <1> ;loc_add_new_cluster_check_ffc_eax:
  1624                              <1> ;	cmp	eax, 2
  1625                              <1> ;	jb	short loc_add_new_cluster_invalid_format_retn
  1626                              <1> 
  1627                              <1> loc_add_new_cluster_save_fcc:  
  1628 0000D686 A3[488D0100]        <1> 	mov	[FAT_anc_FFCluster], eax
  1629                              <1> 
  1630 0000D68B 83E802              <1> 	sub	eax, 2
  1631 0000D68E 0FB65E13            <1>         movzx   ebx, byte [esi+LD_BPB+SecPerClust]
  1632 0000D692 F7E3                <1> 	mul	ebx
  1633 0000D694 09D2                <1> 	or	edx, edx
  1634 0000D696 75E6                <1> 	jnz	short loc_anc_invalid_format_stc_retn
  1635                              <1> 
  1636                              <1> loc_add_new_cluster_allocate_cluster:
  1637                              <1> 	; 18/03/2016
  1638 0000D698 92                  <1> 	xchg	edx, eax ; eax = 0
  1639                              <1> 	; 16/05/2016
  1640                              <1> 	;cmp	[ClusterBuffer_Valid], al ; 0
  1641                              <1> 	;jna	short loc_anc_clear_cluster_buffer
  1642                              <1> 	;; 'copy' command, 
  1643                              <1> 	;; writing destination file clust after reading source file clust
  1644                              <1> 	;mov	[ClusterBuffer_Valid], al ; 0 ; reset
  1645                              <1> 	;jmp	short loc_add_new_cluster_write_nc_to_disk
  1646                              <1> 
  1647                              <1> loc_anc_clear_cluster_buffer:
  1648                              <1> 	; 11/03/2016
  1649                              <1> 	; Clear buffer
  1650 0000D699 BF00000700          <1> 	mov	edi, Cluster_Buffer ; 70000h (for current TRDOS 386 version)
  1651 0000D69E 89D9                <1> 	mov	ecx, ebx ; sector count
  1652 0000D6A0 C1E107              <1> 	shl	ecx, 7 ; 1 sector = 512 bytes -> 128 double words
  1653                              <1> 	;xor	eax, eax ; 0
  1654 0000D6A3 F3AB                <1> 	rep	stosd
  1655                              <1> 
  1656                              <1> loc_add_new_cluster_write_nc_to_disk:
  1657                              <1> 	; 11/03/2016
  1658                              <1> 	;xchg	eax, edx ; edx = 0, eax = sector offset
  1659 0000D6A5 89D0                <1> 	mov	eax, edx
  1660 0000D6A7 034668              <1>         add     eax, [esi+LD_DATABegin]
  1661 0000D6AA 72D3                <1> 	jc	short loc_add_new_cluster_invalid_format_retn 
  1662                              <1> 		
  1663 0000D6AC 89D9                <1> 	mov	ecx, ebx ; ECX = sectors per cluster (<256)
  1664 0000D6AE BB00000700          <1> 	mov	ebx, Cluster_Buffer
  1665 0000D6B3 E8564C0000          <1> 	call	disk_write
  1666 0000D6B8 7307                <1> 	jnc	short loc_add_new_cluster_update_fat_nlc
  1667                              <1> 	
  1668                              <1> 	; 15/10/2016 (1Dh -> 18)
  1669 0000D6BA B812000000          <1> 	mov	eax, 18 ; Write Error
  1670 0000D6BF EBB4                <1> 	jmp	short loc_add_new_cluster_stc_retn
  1671                              <1> 
  1672                              <1> loc_add_new_cluster_update_fat_nlc:
  1673 0000D6C1 A1[488D0100]        <1> 	mov	eax, [FAT_anc_FFCluster]
  1674 0000D6C6 31C9                <1> 	xor	ecx, ecx
  1675 0000D6C8 890D[72890100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; reset
  1676 0000D6CE 49                  <1> 	dec	ecx ; 0FFFFFFFFh
  1677 0000D6CF E8ACF9FFFF          <1> 	call	update_cluster
  1678 0000D6D4 7304                <1> 	jnc	short loc_add_new_cluster_update_fat_plc
  1679 0000D6D6 09C0                <1> 	or	eax, eax ;EAX = 0 -> cluster value is 0 or eocc
  1680 0000D6D8 759B                <1> 	jnz	short loc_add_new_cluster_stc_retn
  1681                              <1> 
  1682                              <1> loc_add_new_cluster_update_fat_plc:
  1683 0000D6DA A1[448D0100]        <1> 	mov	eax, [FAT_anc_LCluster]
  1684 0000D6DF 8B0D[488D0100]      <1> 	mov	ecx, [FAT_anc_FFCluster]
  1685 0000D6E5 E896F9FFFF          <1> 	call	update_cluster
  1686 0000D6EA 7314                <1> 	jnc	short loc_add_new_cluster_save_fat_buffer
  1687 0000D6EC 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1688 0000D6EE 7410                <1> 	jz	short loc_add_new_cluster_save_fat_buffer
  1689                              <1> 
  1690                              <1> loc_anc_save_fat_buffer_err_retn:
  1691                              <1> 	;cmp	byte [FAT_ClusterCounter], 1
  1692                              <1> 	;jb	short loc_add_new_cluster_retn
  1693                              <1> 
  1694 0000D6F0 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space (BL = 0)
  1695                              <1> 			   ; (BH = FFh -> Use ESI as Drv Param. Tbl.)
  1696 0000D6F4 50                  <1> 	push	eax
  1697 0000D6F5 E8D8FCFFFF          <1> 	call	calculate_fat_freespace
  1698 0000D6FA 58                  <1> 	pop	eax
  1699 0000D6FB E975FFFFFF          <1>         jmp     loc_add_new_cluster_stc_retn
  1700                              <1> 
  1701                              <1> loc_add_new_cluster_save_fat_buffer:
  1702                              <1> 	;cmp	byte [FAT_BuffValidData], 2
  1703                              <1> 	;jne	short loc_add_new_cluster_calc_FAT_freespace 
  1704                              <1> 	;Byte [FAT_BuffValidData] =  2 
  1705 0000D700 E838FCFFFF          <1> 	call	save_fat_buffer
  1706 0000D705 72E9                <1> 	jc	short loc_anc_save_fat_buffer_err_retn
  1707                              <1> 
  1708                              <1> loc_add_new_cluster_calc_FAT_freespace:
  1709                              <1> 	;mov	eax, 1 ; Only one Cluster
  1710 0000D707 A1[72890100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1711 0000D70C 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> ESI -> Dos drv desc. table
  1712                              <1> 		; BL = 1 -> add cluster
  1713 0000D710 B301                <1> 	mov	bl, 01h ; BL = 1 -> add clusters
  1714                              <1> 	; NOTE: EAX value will be added to Free Cluster Count
  1715                              <1> 	; (Free Cluster Count is decreased when EAX value is negative)
  1716 0000D712 E8BBFCFFFF          <1>         call    calculate_fat_freespace
  1717                              <1> 	;ECX = 0 -> no error, ECX > 0 -> error or invalid return
  1718 0000D717 21C9                <1> 	and	ecx, ecx ; ECX = 0 -> valid free sector count
  1719 0000D719 7409                <1> 	jz	short loc_add_new_cluster_return_cluster_number
  1720                              <1> 
  1721                              <1> loc_add_new_cluster_recalc_FAT_freespace:
  1722 0000D71B 66BB00FF            <1> 	mov	bx, 0FF00h  ; recalculate free space
  1723 0000D71F E8AEFCFFFF          <1>         call    calculate_fat_freespace
  1724                              <1> 	; cf = 0
  1725                              <1> loc_add_new_cluster_return_cluster_number:
  1726 0000D724 89C1                <1> 	mov	ecx, eax ; Free sector count
  1727 0000D726 A1[488D0100]        <1> 	mov	eax, [FAT_anc_FFCluster]
  1728 0000D72B 0FB65E13            <1> 	movzx	ebx, byte [esi+LD_BPB+SecPerClust]
  1729                              <1> 	;mov	edi, Cluster_Buffer
  1730 0000D72F 31D2                <1> 	xor	edx, edx
  1731 0000D731 C3                  <1>         retn
  1732                              <1> 
  1733                              <1> write_cluster:
  1734                              <1> 	; 15/10/2016
  1735                              <1> 	; 21/03/2016 (TRDOS 386 =  TRDOS v2.0)
  1736                              <1> 	;
  1737                              <1> 	; INPUT ->
  1738                              <1> 	;	EAX = Cluster Number (Sector index for SINGLIX FS)
  1739                              <1> 	;	ESI = Logical DOS Drive Description Table address
  1740                              <1> 	;	EBX = Cluster (File R/W) Buffer address (max. 64KB)
  1741                              <1> 	;	Only for SINGLIX FS:
  1742                              <1> 	;	EDX = File Number (The 1st FDT address) 
  1743                              <1> 	; OUTPUT ->
  1744                              <1> 	;	cf = 1 -> Cluster can not be written onto disk
  1745                              <1> 	;	    EAX > 0 -> Error number
  1746                              <1> 	;	cf = 0 -> Cluster has been written successfully
  1747                              <1> 	;
  1748                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
  1749                              <1> 	
  1750 0000D732 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+BPB_SecPerClust] 
  1751                              <1> 	; CL = 1 = [esi+LD_FS_Reserved2] ; SectPerClust for Singlix FS
  1752                              <1> 
  1753                              <1> write_file_sectors: ; 16/03/2016
  1754 0000D736 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  1755 0000D73A 761C                <1> 	jna	short write_fs_cluster
  1756                              <1> 
  1757                              <1> write_fat_file_sectors: 
  1758 0000D73C 83E802              <1> 	sub	eax, 2 ; Beginning cluster number is always 2
  1759 0000D73F 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+BPB_SecPerClust] ; 18/03/2016 
  1760 0000D743 F7E2                <1> 	mul	edx
  1761 0000D745 034668              <1> 	add	eax, [esi+LD_DATABegin] ; absolute address of the cluster
  1762                              <1> 
  1763                              <1> 	; EAX = Disk sector address
  1764                              <1> 	; ECX = Sector count
  1765                              <1> 	; EBX = Buffer address
  1766                              <1> 	; (EDX = 0)
  1767                              <1> 	; ESI = Logical DOS drive description table address	
  1768                              <1> 
  1769 0000D748 E8C14B0000          <1> 	call	disk_write
  1770 0000D74D 7306                <1> 	jnc	short wclust_retn
  1771                              <1> 	
  1772                              <1> 	; 15/10/2016 (1Dh -> 18)
  1773 0000D74F B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error !
  1774 0000D754 C3                  <1> 	retn
  1775                              <1> 
  1776                              <1> wclust_retn:
  1777 0000D755 29C0                <1> 	sub	eax, eax ; 0
  1778 0000D757 C3                  <1> 	retn
  1779                              <1> 
  1780                              <1> write_fs_cluster:
  1781                              <1> 	; 21/03/2016 (TRDOS 386 =  TRDOS v2.0)
  1782                              <1> 	; Singlix FS
  1783                              <1> 	
  1784                              <1> 	; EAX = Cluster number is sector index number of the file (eax)
  1785                              <1> 	
  1786                              <1> 	; EDX = File number is the first File Descriptor Table address 
  1787                              <1> 	;	of the file. (Absolute address of the FDT).
  1788                              <1> 	
  1789                              <1> 	; eax = sector index (0 for the first sector)
  1790                              <1> 	; edx = FDT0 address
  1791                              <1> 		; 64 KB buffer = 128 sectors (limit) 
  1792 0000D758 B980000000          <1> 	mov	ecx, 128 ; maximum count of sectors (before eof) 
  1793 0000D75D E801000000          <1> 	call	write_fs_sectors
  1794 0000D762 C3                  <1> 	retn
  1795                              <1> 
  1796                              <1> write_fs_sectors:
  1797                              <1> 	; 21/03/2016 (TRDOS 386 =  TRDOS v2.0)
  1798 0000D763 F9                  <1> 	stc
  1799 0000D764 C3                  <1> 	retn
  1800                              <1> 
  1801                              <1> get_cluster_by_index:
  1802                              <1> 	; 29/04/2016 (TRDOS 386 =  TRDOS v2.0)
  1803                              <1> 	; INPUT ->
  1804                              <1> 	; 	EAX = Beginning cluster
  1805                              <1> 	; 	EDX = Sector index in disk/file section
  1806                              <1> 	;	      (Only for SINGLIX file system!)
  1807                              <1> 	; 	ECX = Cluster sequence number after the beginning cluster
  1808                              <1> 	; 	ESI = Logical DOS Drive Description Table address
  1809                              <1> 	; OUTPUT ->
  1810                              <1> 	;	EAX = Cluster number 
  1811                              <1> 	;	cf = 1 -> Error code in AL (EAX)
  1812                              <1> 	;
  1813                              <1> 	;(Modified registers: EAX, ECX, EBX, EDX)
  1814                              <1> 	;	
  1815 0000D765 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  1816 0000D769 721E                <1>         jb      short get_fs_section_by_index 
  1817                              <1> 
  1818 0000D76B 3B4E78              <1> 	cmp	ecx, [esi+LD_Clusters]
  1819 0000D76E 7207                <1> 	jb	short gcbi_1
  1820                              <1> gcbi_0:
  1821 0000D770 F9                  <1> 	stc
  1822 0000D771 B823000000          <1> 	mov	eax, 23h ; Cluster not available ! 
  1823                              <1> 			 ; MSDOS error code: FCB unavailable
  1824 0000D776 C3                  <1> 	retn
  1825                              <1> gcbi_1:
  1826 0000D777 51                  <1> 	push	ecx
  1827 0000D778 E8D9F5FFFF          <1> 	call	get_next_cluster
  1828 0000D77D 59                  <1> 	pop	ecx
  1829 0000D77E 7203                <1> 	jc	short gcbi_3
  1830 0000D780 E2F5                <1> 	loop	gcbi_1
  1831                              <1> gcbi_2:
  1832 0000D782 C3                  <1> 	retn
  1833                              <1> gcbi_3:
  1834 0000D783 09C0                <1> 	or	eax, eax
  1835 0000D785 74E9                <1> 	jz	short gcbi_0
  1836 0000D787 F5                  <1> 	cmc 	; stc
  1837 0000D788 C3                  <1> 	retn
  1838                              <1> 
  1839                              <1> get_fs_section_by_index:
  1840                              <1> 	; 29/04/2016 (TRDOS 386 =  TRDOS v2.0)
  1841                              <1> 	; INPUT ->
  1842                              <1> 	; 	EAX = Beginning FDT number/address
  1843                              <1> 	; 	EDX = Sector index in disk/file section
  1844                              <1> 	; 	ECX = Sector sequence number after the beginning FDT
  1845                              <1> 	; 	ESI = Logical DOS Drive Description Table address
  1846                              <1> 	; OUTPUT ->
  1847                              <1> 	; 	EAX = FDT number/address
  1848                              <1> 	; 	EDX = Sector index of the section (0,1,2,3,4...)
  1849                              <1> 	;	cf = 1 -> Error code in AL (EAX)
  1850                              <1> 	;
  1851                              <1> 	;(Modified registers: EAX, ECX, EBX, EDX)
  1852                              <1> 	;
  1853 0000D789 B8FFFFFFFF          <1> 	mov	eax, 0FFFFFFFFh
  1854 0000D78E C3                  <1> 	retn
  1855                              <1> 
  1856                              <1> get_last_section:
  1857                              <1> 	; 22/10/2016 (TRDOS 386 =  TRDOS v2.0)	
  1858                              <1> 	; INPUT ->
  1859                              <1> 	; 	EAX = (The 1st) FDT number/address
  1860                              <1> 	; 	ESI = Logical DOS Drive Description Table address
  1861                              <1> 	; OUTPUT ->
  1862                              <1> 	; 	EAX = FDT number/address of the last section
  1863                              <1> 	; 	EDX = Last sector of the section (0,1,2,3,4...)
  1864                              <1> 	;	[glc_index] = sector index number of the last sector
  1865                              <1> 	;		      (for file, not for the last section)  	
  1866                              <1> 	;		   	
  1867                              <1> 	;	cf = 1 -> Error code in AL (EAX)
  1868                              <1> 	;
  1869                              <1> 	;(Modified registers: EAX, ECX, EBX, EDX)
  1870                              <1> 	;
  1871 0000D78F B800000000          <1> 	mov	eax, 0
  1872 0000D794 BA00000000          <1> 	mov	edx, 0
  1873 0000D799 C3                  <1> 	retn
  3084                                  %include 'trdosk6.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.3) - MAIN PROGRAM : trdosk6.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 24/01/2021
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.15 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    11                              <1> ; u1.s (27/17/2015), u2.s (03/01/2016)
    12                              <1> ; ****************************************************************************
    13                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    14                              <1> ; TRDOS2.ASM (09/11/2011)
    15                              <1> ; ----------------------------------------------------------------------------
    16                              <1> ; INT_21H.ASM (c) 2009-2011 Erdogan TAN  [14/11/2009] Last Update: 08/11/2011
    17                              <1> 
    18                              <1> sysent: ; < enter to system call >
    19                              <1> 	; 17/03/2017
    20                              <1> 	; 03/03/2017
    21                              <1> 	; 19/02/2017
    22                              <1> 	; 13/01/2017
    23                              <1> 	; 06/06/2016
    24                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
    25                              <1> 	; 16/04/2015 - 19/10/2015 (Retro UNIX 386 v1)
    26                              <1> 	; 10/04/2013 - 18/01/2014 (Retro UNIX 8086 v1)
    27                              <1> 	;
    28                              <1> 	; 'unkni' or 'sysent' is sytem entry from various traps. 
    29                              <1> 	; The trap type is determined and an indirect jump is made to 
    30                              <1> 	; the appropriate system call handler. If there is a trap inside
    31                              <1> 	; the system a jump to panic is made. All user registers are saved 
    32                              <1> 	; and u.sp points to the end of the users stack. The sys (trap)
    33                              <1> 	; instructor is decoded to get the the system code part (see
    34                              <1> 	; trap instruction in the PDP-11 handbook) and from this 
    35                              <1> 	; the indirect jump address is calculated. If a bad system call is
    36                              <1> 	; made, i.e., the limits of the jump table are exceeded, 'badsys'
    37                              <1> 	; is called. If the call is legitimate control passes to the
    38                              <1> 	; appropriate system routine.
    39                              <1> 	;
    40                              <1> 	; Calling sequence:
    41                              <1> 	;	Through a trap caused by any sys call outside the system.
    42                              <1> 	; Arguments:
    43                              <1> 	;	Arguments of particular system call.	
    44                              <1> 	; ...............................................................
    45                              <1> 	;	
    46                              <1> 	; Retro UNIX 8086 v1 modification: 
    47                              <1> 	;       System call number is in EAX register.
    48                              <1> 	;
    49                              <1> 	;       Other parameters are in EDX, EBX, ECX, ESI, EDI, EBP
    50                              <1> 	;	registers depending of function details.
    51                              <1>   	;
    52                              <1> 	; 16/04/2015
    53 0000D79A 368925[5C030300]    <1>         mov     [ss:u.sp], esp ; Kernel stack points to return address
    54                              <1> 
    55                              <1> 	; save user registers
    56 0000D7A1 1E                  <1> 	push	ds
    57 0000D7A2 06                  <1> 	push	es
    58 0000D7A3 0FA0                <1> 	push	fs
    59 0000D7A5 0FA8                <1> 	push	gs
    60 0000D7A7 60                  <1> 	pushad  ; eax, ecx, edx, ebx, esp -before pushad-, ebp, esi, edi
    61                              <1> 	;
    62                              <1> 	; ESPACE = [ss:u.sp] - esp ; 4*12 = 48 ; 17/09/2015 ; 06/06/2016
    63                              <1> 	; 	(ESPACE is size of space in kernel stack 
    64                              <1> 	;	for saving/restoring user registers.)
    65                              <1> 	;
    66 0000D7A8 50                  <1> 	push	eax ; 01/07/2015
    67 0000D7A9 66B81000            <1> 	mov     ax, KDATA
    68 0000D7AD 8ED8                <1>         mov     ds, ax
    69 0000D7AF 8EC0                <1>         mov     es, ax
    70 0000D7B1 8EE0                <1>         mov     fs, ax
    71 0000D7B3 8EE8                <1>         mov     gs, ax
    72 0000D7B5 A1[90810100]        <1> 	mov	eax, [k_page_dir]
    73 0000D7BA 0F22D8              <1> 	mov	cr3, eax
    74 0000D7BD 58                  <1> 	pop	eax ; 01/07/2015
    75                              <1> 	; 19/10/2015
    76 0000D7BE FC                  <1> 	cld
    77                              <1> 	;
    78 0000D7BF FE05[5B030300]      <1> 	inc	byte [sysflg]
    79                              <1> 		; incb sysflg / indicate a system routine is in progress
    80 0000D7C5 FB                  <1>         sti 	; 18/01/2014
    81 0000D7C6 0F85DF9DFFFF        <1> 	jnz     panic ; 24/05/2013
    82                              <1> 		; beq 1f
    83                              <1> 		; jmp panic ; / called if trap inside system
    84                              <1> ;1:
    85                              <1> 	; 17/03/2017
    86 0000D7CC 80642438FE          <1> 	and	byte [esp+ESPACE+8], ~1 ; clear carry flag
    87                              <1> 
    88                              <1> 	; 16/04/2015
    89 0000D7D1 A3[64030300]        <1> 	mov	[u.r0], eax
    90 0000D7D6 8925[60030300]      <1> 	mov	[u.usp], esp ; kernel stack points to user's registers
    91                              <1> 
    92                              <1> 	; 13/01/2017 (TRDOS 386 Feaure only !)
    93 0000D7DC 803D[D4030300]00    <1> 	cmp	byte [u.t_lock], 0 ; timer interrupt lock ?
    94 0000D7E3 0F879D010000        <1> 	ja	sysrele		   ; yes, sys release only !!!
    95                              <1> 
    96                              <1> 		; mov $s.syst+2,clockp
    97                              <1> 		; mov r0,-(sp) / save user registers 
    98                              <1> 		; mov sp,u.r0 / pointer to bottom of users stack 
    99                              <1> 			   ; / in u.r0
   100                              <1> 		; mov r1,-(sp)
   101                              <1> 		; mov r2,-(sp)
   102                              <1> 		; mov r3,-(sp)
   103                              <1> 		; mov r4,-(sp)
   104                              <1> 		; mov r5,-(sp)
   105                              <1> 		; mov ac,-(sp) / "accumulator" register for extended
   106                              <1> 		             ; / arithmetic unit
   107                              <1> 		; mov mq,-(sp) / "multiplier quotient" register for the
   108                              <1> 		             ; / extended arithmetic unit
   109                              <1> 		; mov sc,-(sp) / "step count" register for the extended
   110                              <1> 		             ; / arithmetic unit
   111                              <1> 		; mov sp,u.sp / u.sp points to top of users stack
   112                              <1> 		; mov 18.(sp),r0 / store pc in r0
   113                              <1> 		; mov -(r0),r0 / sys inst in r0      10400xxx
   114                              <1> 		; sub $sys,r0 / get xxx code
   115 0000D7E9 C1E002              <1> 	shl	eax, 2
   116                              <1> 		; asl r0 / multiply by 2 to jump indirect in bytes
   117 0000D7EC 3DB8000000          <1> 	cmp	eax, end_of_syscalls - syscalls
   118                              <1> 		; cmp r0,$2f-1f / limit of table (35) exceeded
   119                              <1> 	;jnb	short badsys
   120                              <1> 		; bhis badsys / yes, bad system call
   121 0000D7F1 F5                  <1> 	cmc
   122 0000D7F2 9C                  <1> 	pushf	
   123 0000D7F3 50                  <1> 	push	eax
   124 0000D7F4 8B2D[5C030300]      <1>  	mov 	ebp, [u.sp] ; Kernel stack at the beginning of sys call
   125 0000D7FA B0FE                <1> 	mov	al, 0FEh ; 11111110b
   126 0000D7FC 1400                <1> 	adc	al, 0 ; al = al + cf
   127 0000D7FE 204508              <1> 	and	[ebp+8], al ; flags (reset carry flag)
   128                              <1> 		; bic $341,20.(sp) / set users processor priority to 0 
   129                              <1> 				 ; / and clear carry bit
   130 0000D801 5D                  <1> 	pop	ebp ; eax
   131 0000D802 9D                  <1> 	popf
   132 0000D803 0F8208020000        <1>         jc      badsys
   133 0000D809 A1[64030300]        <1> 	mov	eax, [u.r0]
   134                              <1> 	; system call registers: EAX, EDX, ECX, EBX, ESI, EDI
   135 0000D80E FFA5[14D80000]      <1> 	jmp	dword [ebp+syscalls]
   136                              <1> 		; jmp *1f(r0) / jump indirect thru table of addresses
   137                              <1> 		            ; / to proper system routine.
   138                              <1> syscalls: ; 1:
   139                              <1> 	; 31/12/2017
   140                              <1> 	; 28/02/2017
   141                              <1> 	; 20/02/2017
   142                              <1> 	; 19/02/2017
   143                              <1> 	; 15/10/2016
   144                              <1> 	; 20/05/2016
   145                              <1> 	; 19/05/2016
   146                              <1> 	; 16/05/2016
   147                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   148                              <1> 	; 21/09/2015
   149                              <1> 	; 01/07/2015
   150                              <1> 	; 16/04/2015 (32 bit address modification) 
   151 0000D814 [08120100]          <1> 	dd sysver	; 0 ; Get TRDOS 386 version number (v2.0)	
   152 0000D818 [73DA0000]          <1> 	dd sysexit 	; 1
   153 0000D81C [48DC0000]          <1> 	dd sysfork 	; 2
   154 0000D820 [7BE00000]          <1> 	dd sysread 	; 3
   155 0000D824 [9AE00000]          <1> 	dd syswrite 	; 4
   156 0000D828 [31DE0000]          <1> 	dd sysopen 	; 5
   157 0000D82C [52E00000]          <1> 	dd sysclose 	; 6
   158 0000D830 [CADB0000]          <1> 	dd syswait 	; 7
   159 0000D834 [60DD0000]          <1> 	dd syscreat 	; 8
   160 0000D838 [5C200100]          <1> 	dd sysrename	; 9  ; TRDOS 386, Rename File (31/12/2017)
   161 0000D83C [D71B0100]          <1> 	dd sysdelete	; 10 ; TRDOS 386, Delete File (29/12/2017)
   162 0000D840 [A5050100]          <1> 	dd sysexec 	; 11
   163 0000D844 [011D0100]          <1> 	dd syschdir 	; 12
   164 0000D848 [C61E0100]          <1> 	dd systime 	; 13 ; TRDOS 386, Get Sys Date&Time (30/12/2017)
   165 0000D84C [14E00000]          <1> 	dd sysmkdir 	; 14
   166 0000D850 [351D0100]          <1> 	dd syschmod 	; 15 ; TRDOS 386, Change Attributes (30/12/2017) 
   167 0000D854 [3E1C0100]          <1> 	dd sysrmdir 	; 16 ; TRDOS 386, Remove Directory (29/12/2017)
   168 0000D858 [80080100]          <1> 	dd sysbreak 	; 17
   169 0000D85C [1B1E0100]          <1> 	dd sysdrive 	; 18 ; TRDOS 386, Get/Set Current Drv (30/12/2017) 
   170 0000D860 [C1080100]          <1> 	dd sysseek 	; 19
   171 0000D864 [D3080100]          <1> 	dd systell 	; 20
   172 0000D868 [7D210100]          <1> 	dd sysmem 	; 21 ; TRDOS 386, Get Total&Free Mem (31/12/2017)
   173 0000D86C [B3210100]          <1> 	dd sysprompt 	; 22 ; TRDOS 386, Change Cmd Prompt (31/12/2017)
   174 0000D870 [F5210100]          <1> 	dd syspath 	; 23 ; TRDOS 386, Get/Set Run Path (31/12/2017)
   175 0000D874 [62220100]          <1> 	dd sysenv 	; 24 ; TRDOS 386, Get/Set Env Vars (31/12/2017)
   176 0000D878 [471F0100]          <1> 	dd sysstime 	; 25 ; TRDOS 386, Set Sys Date&Time (30/12/2017)
   177 0000D87C [39090100]          <1> 	dd sysquit 	; 26
   178 0000D880 [2D090100]          <1> 	dd sysintr 	; 27
   179 0000D884 [6A1E0100]          <1> 	dd sysdir 	; 28 ; TRDOS 386, Get Curr Drive&Dir (30/12/2017) 
   180 0000D888 [31E10000]          <1> 	dd sysemt 	; 29
   181 0000D88C [A51E0100]          <1> 	dd sysldrvt	; 30 ; TRDOS 386, Get Logical DOS DDT (30/12/2017)
   182 0000D890 [E2E20000]          <1> 	dd sysvideo 	; 31 ; TRDOS 386 Video Functions (16/05/2016)
   183 0000D894 [2C2C0100]          <1> 	dd sysaudio 	; 32 ; TRDOS 386 Audio Functions (16/05/2016)
   184 0000D898 [4AE10000]          <1> 	dd systimer 	; 33 ; TRDOS 386 Timer Functions (18/05/2016)
   185 0000D89C [7A090100]          <1> 	dd syssleep 	; 34 ; Retro UNIX 8086 v1 feature only !
   186                              <1> 			     ; 11/06/2014
   187 0000D8A0 [A9090100]          <1> 	dd sysmsg	; 35 ; Retro UNIX 386 v1 feature only !
   188                              <1> 			     ; 01/07/2015
   189 0000D8A4 [C60A0100]          <1> 	dd sysgeterr	; 36 ; Retro UNIX 386 v1 feature only !
   190                              <1> 			     ; 21/09/2015 - get last error number
   191 0000D8A8 [AE1B0100]          <1> 	dd sysfpstat	; 37 ; TRDOS 386 FPU state option (28/02/2017)
   192 0000D8AC [17120100]          <1> 	dd syspri 	; 38 ; change priority - TRDOS 386 (20/05/2016)
   193 0000D8B0 [86D90000]          <1> 	dd sysrele	; 39 ; TRDOS 386 (19/05/2016) (0 -> 39)
   194 0000D8B4 [4A130100]          <1> 	dd sysfff	; 40 ; Find First File - TRDOS 386 (15/10/2016)
   195 0000D8B8 [29140100]          <1> 	dd sysfnf	; 41 ; Find Next File - TRDOS 386 (15/10/2016)
   196 0000D8BC [991A0100]          <1> 	dd sysalloc	; 42 ; Allocate contiguous memory block/pages
   197                              <1> 			     ; TRDOS 386 (19/02/2017) DMA buff fuctions		
   198 0000D8C0 [571B0100]          <1> 	dd sysdalloc	; 43 ; Deallocate contiguous memory block/pages
   199                              <1> 			     ; TRDOS 386 (19/02/2017) DMA buff fuctions
   200 0000D8C4 [921B0100]          <1> 	dd syscalbac	; 44 ; IRQ Callback and Signal Response Byte
   201                              <1> 			     ; service setup - TRDOS 386 (20/02/2017)
   202                              <1> 			     ; 28/08/2017 (20/08/2017)	
   203 0000D8C8 [BD340100]          <1> 	dd sysdma	; 45 ; TRDOS 386 - (ISA) DMA service
   204                              <1> 	
   205                              <1> end_of_syscalls:
   206                              <1> 
   207                              <1> error:
   208                              <1> 	; 18/05/2016
   209                              <1> 	; 13/05/2016
   210                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   211                              <1> 	; 16/04/2015 - 17/09/2015 (Retro UNIX 386 v1)
   212                              <1> 	; 10/04/2013 - 07/08/2013 (Retro UNIX 8086 v1)
   213                              <1> 	;
   214                              <1> 	; 'error' merely sets the error bit off the processor status (c-bit)
   215                              <1> 	; then falls right into the 'sysret', 'sysrele' return sequence.
   216                              <1> 	;
   217                              <1> 	; INPUTS -> none
   218                              <1> 	; OUTPUTS ->
   219                              <1> 	;	processor status - carry (c) bit is set (means error)
   220                              <1> 	;
   221                              <1> 	; 26/05/2013 (Stack pointer must be reset here! 
   222                              <1> 	; 	      Because, jumps to error procedure
   223                              <1> 	;	      disrupts push-pop nesting balance)
   224                              <1> 	;
   225 0000D8CC 8B2D[5C030300]      <1> 	mov	ebp, [u.sp] ; interrupt (system call) return (iretd) address
   226 0000D8D2 804D0801            <1> 	or	byte [ebp+8], 1  ; set carry bit of flags register
   227                              <1> 				 ; (system call will return with cf = 1)
   228                              <1> 		; bis $1,20.(r1) / set c bit in processor status word below
   229                              <1> 		               ; / users stack
   230                              <1> 	; 17/09/2015
   231 0000D8D6 83ED30              <1> 	sub	ebp, ESPACE ; 48 ; total size of stack frame ('sysdefs.inc')
   232                              <1> 				 ; for saving/restoring user registers	
   233                              <1> 	;cmp	ebp, [u.usp]
   234                              <1> 	;je	short err0	
   235 0000D8D9 892D[60030300]      <1> 	mov	[u.usp], ebp
   236                              <1> ;err0:
   237                              <1> 	; 01/09/2015
   238 0000D8DF 8B25[60030300]      <1> 	mov	esp, [u.usp] 	    ; Retro Unix 8086 v1 modification!
   239                              <1> 				    ; 10/04/2013
   240                              <1> 				    ; (If an I/O error occurs during disk I/O,
   241                              <1> 				    ; related procedures will jump to 'error'
   242                              <1> 				    ; procedure directly without returning to 
   243                              <1> 				    ; the caller procedure. So, stack pointer
   244                              <1>                                     ; must be restored here.)
   245                              <1> 	; 13/05/2016
   246                              <1> 	; NOTE: (The last) error code is in 'u.error', it can be retrieved by
   247                              <1> 	;	'get last error' system call later. 	
   248                              <1> 
   249                              <1> 	; 03/09/2015 - 09/06/2015 - 07/08/2013
   250 0000D8E5 C605[C6030300]00    <1> 	mov 	byte [u.kcall], 0 ; namei_r, mkdir_w reset
   251                              <1> 
   252                              <1> sysret: ; < return from system call>
   253                              <1> 	; 01/03/2017
   254                              <1> 	; 28/02/2017
   255                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   256                              <1> 	; 16/04/2015 - 10/09/2015 (Retro UNIX 386 v1)
   257                              <1> 	; 10/04/2013 - 23/02/2014 (Retro UNIX 8086 v1)
   258                              <1> 	;
   259                              <1> 	; 'sysret' first checks to see if process is about to be 
   260                              <1> 	; terminated (u.bsys). If it is, 'sysexit' is called.
   261                              <1> 	; If not, following happens:	 
   262                              <1> 	; 	1) The user's stack pointer is restored.
   263                              <1> 	;	2) r1=0 and 'iget' is called to see if last mentioned
   264                              <1> 	;	   i-node has been modified. If it has, it is written out
   265                              <1> 	;	   via 'ppoke'.
   266                              <1> 	;	3) If the super block has been modified, it is written out
   267                              <1> 	;	   via 'ppoke'.				
   268                              <1> 	;	4) If the dismountable file system's super block has been
   269                              <1> 	;	   modified, it is written out to the specified device
   270                              <1> 	;	   via 'ppoke'.
   271                              <1> 	;	5) A check is made if user's time quantum (uquant) ran out
   272                              <1> 	;	   during his execution. If so, 'tswap' is called to give
   273                              <1> 	;	   another user a chance to run.
   274                              <1> 	;	6) 'sysret' now goes into 'sysrele'. 
   275                              <1> 	;	    (See 'sysrele' for conclusion.)		
   276                              <1> 	;
   277                              <1> 	; Calling sequence:
   278                              <1> 	;	jump table or 'br sysret'
   279                              <1> 	; Arguments: 
   280                              <1> 	;	-	
   281                              <1> 	; ...............................................................
   282                              <1> 	;	
   283                              <1> 	; ((AX=r1 for 'iget' input))
   284                              <1> 	;	
   285 0000D8EC 31C0                <1> 	xor	eax, eax ; 28/02/2017
   286                              <1> sysret0: ; 29/07/2015 (eax = 0, jump from sysexec)
   287 0000D8EE FEC0                <1> 	inc	al ; 04/05/2013
   288 0000D8F0 3805[B2030300]      <1> 	cmp	[u.bsys], al ; 1
   289                              <1> 		; tstb u.bsys / is a process about to be terminated because
   290 0000D8F6 0F8377010000        <1>         jnb     sysexit ; 04/05/2013
   291                              <1> 		; bne sysexit / of an error? yes, go to sysexit
   292                              <1> 	;mov	esp, [u.usp] ; 24/05/2013 (that is not needed here)
   293                              <1> 		; mov u.sp,sp / no point stack to users stack
   294 0000D8FC FEC8                <1> 	dec 	al ; mov ax, 0
   295                              <1> 		; clr r1 / zero r1 to check last mentioned i-node
   296 0000D8FE E80A4A0000          <1> 	call	iget
   297                              <1> 		; jsr r0,iget / if last mentioned i-node has been modified
   298                              <1> 		            ; / it is written out
   299                              <1> 	; 10/01/2017
   300                              <1> 	; 09/01/2017
   301                              <1> ;sysrele: ; < release >
   302                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   303                              <1> 	; 16/04/2015 - 14/10/2015 (Retro UNIX 386 v1)
   304                              <1> 	; 10/04/2013 - 07/03/2014 (Retro UNIX 8086 v1)
   305                              <1> 	;
   306                              <1> 	; 'sysrele' first calls 'tswap' if the time quantum for a user is
   307                              <1> 	;  zero (see 'sysret'). It then restores the user's registers and
   308                              <1> 	; turns off the system flag. It then checked to see if there is
   309                              <1> 	; an interrupt from the user by calling 'isintr'. If there is, 
   310                              <1> 	; the output gets flashed (see isintr) and interrupt action is
   311                              <1> 	; taken by a branch to 'intract'. If there is no interrupt from
   312                              <1> 	; the user, a rti is made.
   313                              <1> 	;
   314                              <1> 	; Calling sequence:
   315                              <1> 	;	Fall through a 'bne' in 'sysret' & ?
   316                              <1> 	; Arguments:
   317                              <1> 	;	-	
   318                              <1> 	; ...............................................................
   319                              <1> 	;	
   320                              <1> 	; 23/02/2014 (swapret)
   321                              <1> 	; 22/09/2013
   322                              <1> sysrel0: ;1:
   323 0000D903 803D[A8030300]00    <1> 	cmp	byte [u.quant], 0 ; 16/05/2013
   324                              <1> 		; tstb uquant / is the time quantum 0?
   325 0000D90A 7705                <1>         ja      short swapret
   326                              <1> 		; bne 1f / no, don't swap it out
   327                              <1> sysrelease: ; 07/12/2013 (jump from 'clock')
   328 0000D90C E8BF370000          <1> 	call	tswap
   329                              <1> 		; jsr r0,tswap / yes, swap it out
   330                              <1> 	
   331                              <1> ; Retro Unix 8086 v1 feature: return from 'swap' to 'swapret' address.
   332                              <1> swapret: ;1:
   333                              <1> 	; 10/09/2015
   334                              <1> 	; 01/09/2015
   335                              <1> 	; 14/05/2015
   336                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - 32 bit, pm modifications)
   337                              <1> 	; 26/05/2013 (Retro UNIX 8086 v1)
   338                              <1> 	; cli
   339                              <1> 	; 24/07/2015
   340                              <1> 	;
   341                              <1> 	;; 'esp' must be already equal to '[u.usp]' here ! 
   342                              <1> 	;; mov	esp, [u.usp]
   343                              <1> 
   344                              <1> 	; 22/09/2013
   345 0000D911 E8F7490000          <1> 	call	isintr
   346                              <1> 	; 20/10/2013
   347 0000D916 7405                <1> 	jz	short sysrel1
   348 0000D918 E83F010000          <1> 	call	intract
   349                              <1> 		; jsr r0,isintr / is there an interrupt from the user
   350                              <1> 		;     br intract / yes, output gets flushed, take interrupt
   351                              <1> 		               ; / action
   352                              <1> sysrel1:
   353 0000D91D FA                  <1> 	cli	; 14/10/2015
   354                              <1> sysrel2:
   355                              <1> 	; 28/02/2017
   356                              <1> 	; Check if there is a (delayed) callback for current user/process
   357 0000D91E A0[D7030300]        <1> 	mov	al, [u.irqwait]
   358 0000D923 240F                <1> 	and	al, 0Fh ; is there a waiting IRQ callback service ?
   359 0000D925 7444                <1> 	jz	short sysrel8 ; no
   360                              <1> 
   361                              <1> 	; Set return to IRQ callback service and return from the service
   362 0000D927 0FB6D8              <1> 	movzx	ebx, al
   363 0000D92A 883D[D7030300]      <1> 	mov 	[u.irqwait], bh ; 0 ; reset
   364 0000D930 8A9B[58410100]      <1> 	mov	bl, [ebx+IRQenum] ; (available) IRQ index +1 (1 to 9)
   365                              <1> 	; 01/03/2017
   366 0000D936 FECB                <1> 	dec	bl ; IRQ index number, 0 to 8
   367 0000D938 7831                <1> 	js	short sysrel8 ; 0 -> FFh (not in use!?) 
   368                              <1> 	;
   369 0000D93A A0[B3030300]        <1> 	mov 	al, [u.uno] ; current process (user) number 
   370 0000D93F 3883[C2930100]      <1> 	cmp	[ebx+IRQ.owner], al
   371 0000D945 7524                <1> 	jne	short sysrel8 ; it is not the current user/process !?
   372 0000D947 F683[D4930100]01    <1> 	test	byte [ebx+IRQ.method], 1 ; callback ?
   373 0000D94E 741B                <1> 	jz	short sysrel8 ; not a callback method !?
   374                              <1> 
   375 0000D950 8B93[E6930100]      <1> 	mov	edx, [ebx+IRQ.addr] ; IRQ callback service address (virtual)
   376 0000D956 C605[D8030300]01    <1> 	mov	byte [u.r_lock], 1 ; IRQ callback service in progress flag
   377                              <1> 
   378 0000D95D E816380000          <1> 	call	wswap ; save user's registers & status 
   379                              <1> 		      ;	(for return from IRQ callback service)
   380                              <1> 
   381 0000D962 8B2D[5C030300]      <1> 	mov	ebp, [u.sp]; kernel's stack, points to EIP (user)
   382 0000D968 895500              <1> 	mov	[ebp], edx ; IRQ call back service address
   383                              <1> sysrel8:
   384 0000D96B FE0D[5B030300]      <1> 	dec	byte [sysflg]
   385                              <1> 		; decb sysflg / turn system flag off
   386                              <1> 	
   387 0000D971 A1[B8030300]        <1> 	mov	eax, [u.pgdir]	
   388 0000D976 0F22D8              <1> 	mov	cr3, eax  ; 1st PDE points to Kernel Page Table 0 (1st 4 MB)
   389                              <1> 			  ; (others are different than kernel page tables) 
   390                              <1> 	; 10/09/2015
   391 0000D979 61                  <1> 	popad ; edi, esi, ebp, temp (icrement esp by 4), ebx, edx, ecx, eax
   392                              <1> 		; mov (sp)+,sc / restore user registers
   393                              <1> 		; mov (sp)+,mq
   394                              <1> 		; mov (sp)+,ac
   395                              <1> 		; mov (sp)+,r5
   396                              <1> 		; mov (sp)+,r4
   397                              <1> 		; mov (sp)+,r3
   398                              <1> 		; mov (sp)+,r2
   399                              <1> 	;
   400 0000D97A A1[64030300]        <1> 	mov	eax, [u.r0]  ; ((return value in EAX))
   401 0000D97F 0FA9                <1> 	pop	gs
   402 0000D981 0FA1                <1> 	pop	fs
   403 0000D983 07                  <1> 	pop	es
   404 0000D984 1F                  <1> 	pop	ds
   405                              <1> 	;or	word [esp+8], 200h ; 22/01/2017 ; force enabling interrupts
   406 0000D985 CF                  <1> 	iretd	
   407                              <1> 		; rti / no, return from interrupt
   408                              <1> 
   409                              <1> sysrele:
   410                              <1> 	; 24/03/2017
   411                              <1> 	; 28/02/2017
   412                              <1> 	; 27/02/2017
   413                              <1> 	; 29/01/2017
   414                              <1> 	; 14/01/2017
   415                              <1> 	; 13/01/2017
   416                              <1> 	; 09/01/2017, 10/01/2017, 12/01/2017
   417                              <1> 	; Major modification for TRDOS 386 (CallBack return)
   418                              <1> 	;
   419                              <1> 	; 'sysrele' system call restores previously saved
   420                              <1> 	; registers and addresses of the process
   421                              <1> 	; (Main purpose -in TRDOS 386- is to return from
   422                              <1> 	; timer callback service routine in ring 3 -user mode-.)
   423                              <1> 	;
   424                              <1> 	; check if the process is in timer callback phase
   425 0000D986 803D[D4030300]00    <1> 	cmp	byte [u.t_lock], 0 ; TIMER INT LOCK
   426                              <1> 	;je	short sysrel0 ; classic (Retro UNIX 386 type) sysrele
   427 0000D98D 7734                <1> 	ja	short sysrel3
   428                              <1> 	; 27/02/2017
   429 0000D98F 803D[D8030300]00    <1> 	cmp	byte [u.r_lock], 0 ; IRQ callback lock	
   430 0000D996 0F8667FFFFFF        <1> 	jna	sysrel0 ; classic sysrele ; 24/03/2017
   431 0000D99C E859000000          <1> 	call	sysrel7
   432 0000D9A1 803D[D8030300]00    <1> 	cmp	byte [u.r_lock], 0 ; IRQ callback service lock
   433 0000D9A8 7628                <1> 	jna	short sysrel4
   434 0000D9AA C605[D8030300]00    <1> 	mov	byte [u.r_lock], 0 ; reset
   435                              <1> 	;mov	byte [u.irqwait], 0 ; reset ; 28/02/2017
   436 0000D9B1 A0[D9030300]        <1> 	mov	al, [u.r_mode]
   437 0000D9B6 08C0                <1> 	or	al, al
   438 0000D9B8 7518                <1> 	jnz	short sysrel4
   439 0000D9BA FEC8                <1> 	dec	al
   440 0000D9BC A2[D9030300]        <1> 	mov	[u.r_mode], al ; 0FFh ; not necessary !?
   441 0000D9C1 EB32                <1> 	jmp	short sysrel6		
   442                              <1> sysrel3:
   443                              <1> 	; 27/02/2017
   444 0000D9C3 E832000000          <1> 	call	sysrel7
   445                              <1> 	; 14/01/2017
   446 0000D9C8 28C0                <1> 	sub	al, al
   447 0000D9CA 3805[D4030300]      <1> 	cmp	[u.t_lock], al ; 0 ; TIMER INT LOCK
   448 0000D9D0 770E                <1> 	ja	short sysrel5 ; yes
   449                              <1> sysrel4:
   450                              <1> 	; 29/01/2017
   451 0000D9D2 8B44241C            <1> 	mov	eax, [esp+28] ; eax
   452 0000D9D6 A3[64030300]        <1> 	mov	[u.r0], eax
   453 0000D9DB E93EFFFFFF          <1> 	jmp	sysrel2
   454                              <1> sysrel5:
   455 0000D9E0 A2[D4030300]        <1> 	mov	[u.t_lock], al ; 0 ; reset
   456 0000D9E5 A0[D5030300]        <1> 	mov	al, [u.t_mode]
   457 0000D9EA 20C0                <1> 	and	al, al
   458                              <1> 	;jnz	short sysrel2 ; 0FFh ; user mode
   459 0000D9EC 75E4                <1> 	jnz	short sysrel4 ; 29/01/2017
   460 0000D9EE FEC8                <1> 	dec	al
   461 0000D9F0 A2[D5030300]        <1> 	mov	[u.t_mode], al ; 0FFh ; not necessary !?
   462                              <1> sysrel6:
   463                              <1> 	; cpu will continue from the interrupted sytem call addr
   464 0000D9F5 61                  <1> 	popad		; edi, esi, ebp, esp, ebx, edx, ecx, eax
   465 0000D9F6 83C410              <1> 	add	esp, 16	; pass segment segisters: ds, es, fs, gs		
   466 0000D9F9 CF                  <1> 	iretd		; eip, cs, eflags
   467                              <1> 
   468                              <1> sysrel7:
   469 0000D9FA 0FB61D[B3030300]    <1> 	movzx	ebx, byte [u.uno] ; current process number
   470 0000DA01 66C1E302            <1> 	shl	bx, 2
   471                              <1> 	;cmp	[ebx+p.tcb-4], eax ; 0 ; is there callback address ?
   472                              <1> 	;jna	short sysrel0 
   473                              <1> 	; yes, reset callback address then restore process registers 
   474                              <1> 	;mov	[ebx+p.tcb-4], eax ; 0 ; reset
   475 0000DA05 8B83[BC000300]      <1> 	mov     eax, [ebx+p.upage-4] ; UPAGE address
   476 0000DA0B FA                  <1> 	cli	; disable interrupts till 'iretd'
   477 0000DA0C E99F370000          <1> 	jmp	rswap ; restore process 'u' structure
   478                              <1>  
   479                              <1> badsys:
   480                              <1> 	; 25/12/2016
   481                              <1> 	; 18/04/2016 (TRDOS 386 = TRDOS v2.0)
   482                              <1> 	; 17/04/2011 (TRDOS v1.0, 'IFC.ASM')
   483                              <1> 	; 03/02/2011 ('trdos_ifc_routine')
   484                              <1> 	;
   485                              <1> 	; 16/04/2015 (Retro UNIX 386 v1, 'badsys')
   486                              <1> 	; (EIP, EAX values will be shown on screen with error message)
   487                              <1> 	; (EIP = 'CD 40h' instruction address -INT 40h-)
   488                              <1> 	; (EAX = Function number)  
   489                              <1> 	;
   490 0000DA11 FE05[B2030300]      <1> 	inc	byte [u.bsys]
   491                              <1> 	;
   492 0000DA17 8B1D[5C030300]      <1> 	mov	ebx, [u.sp] ; esp at the beginning of 'sysent'
   493 0000DA1D 8B03                <1> 	mov	eax, [ebx] ; EIP (return address, not 'INT 30h' address)
   494 0000DA1F 83E802              <1> 	sub	eax, 2 ; CDh, ##h
   495 0000DA22 E8DC68FFFF          <1> 	call	dwordtohex
   496 0000DA27 8915[313F0100]      <1> 	mov	[eip_str], edx
   497 0000DA2D A3[353F0100]        <1> 	mov	[eip_str+4], eax
   498 0000DA32 A1[64030300]        <1> 	mov	eax, [u.r0]
   499 0000DA37 E8C768FFFF          <1> 	call	dwordtohex
   500 0000DA3C 8915[203F0100]      <1> 	mov	[eax_str], edx
   501 0000DA42 A3[243F0100]        <1> 	mov	[eax_str+4], eax
   502                              <1> 
   503 0000DA47 66C705[153F0100]34- <1> 	mov	word [int_num_str], SYSCALL_INT_NUM ; 25/12/2016
   503 0000DA4F 30                  <1>
   504                              <1> 
   505 0000DA50 BE[E73E0100]        <1> 	mov	esi, ifc_msg ; "invalid funtion call !" msg (trdosk9.s)
   506 0000DA55 E8EB9AFFFF          <1> 	call	print_msg
   507                              <1> 
   508 0000DA5A EB17                <1> 	jmp	sysexit
   509                              <1> 
   510                              <1> intract: ; / interrupt action
   511                              <1> 	; 14/10/2015
   512                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - Beginning)
   513                              <1> 	; 09/05/2013 - 07/12/2013 (Retro UNIX 8086 v1)
   514                              <1> 	;
   515                              <1> 	; Retro UNIX 8086 v1 modification !
   516                              <1> 	; (Process/task switching and quit routine by using
   517                              <1> 	; Retro UNIX 8086 v1 keyboard interrupt output.))
   518                              <1> 	;
   519                              <1> 	; input -> 'u.quit'  (also value of 'u.intr' > 0)
   520                              <1> 	; output -> If value of 'u.quit' = FFFFh ('ctrl+brk' sign)
   521                              <1> 	;		'intract' will jump to 'sysexit'.
   522                              <1> 	;	    Intract will return to the caller 
   523                              <1> 	;		if value of 'u.quit' <> FFFFh. 	 
   524                              <1> 	; 14/10/2015
   525 0000DA5C FB                  <1> 	sti
   526                              <1> 	; 07/12/2013	
   527 0000DA5D 66FF05[AC030300]    <1> 	inc 	word [u.quit]
   528 0000DA64 7408                <1> 	jz	short intrct0 ; FFFFh -> 0
   529 0000DA66 66FF0D[AC030300]    <1> 	dec	word [u.quit]
   530                              <1> 	; 16/04/2015
   531 0000DA6D C3                  <1> 	retn
   532                              <1> intrct0:	
   533 0000DA6E 58                  <1> 	pop	eax ; call intract -> retn
   534                              <1> 	;
   535 0000DA6F 31C0                <1> 	xor 	eax, eax
   536 0000DA71 FEC0                <1> 	inc	al  ; mov ax, 1
   537                              <1> ;;;
   538                              <1> 	; UNIX v1 original 'intract' routine... 
   539                              <1> 	; / interrupt action
   540                              <1> 		;cmp *(sp),$rti / are you in a clock interrupt?
   541                              <1> 		; bne 1f / no, 1f
   542                              <1> 		; cmp (sp)+,(sp)+ / pop clock pointer
   543                              <1> 	; 1: / now in user area
   544                              <1> 		; mov r1,-(sp) / save r1
   545                              <1> 		; mov u.ttyp,r1 
   546                              <1> 			; / pointer to tty buffer in control-to r1
   547                              <1> 		; cmpb 6(r1),$177
   548                              <1> 			; / is the interrupt char equal to "del"
   549                              <1> 		; beq 1f / yes, 1f
   550                              <1> 		; clrb 6(r1) 
   551                              <1> 		        ; / no, clear the byte 
   552                              <1> 			; / (must be a quit character)
   553                              <1> 		; mov (sp)+,r1 / restore r1
   554                              <1> 		; clr u.quit / clear quit flag
   555                              <1> 		; bis $20,2(sp) 
   556                              <1> 		    	; / set trace for quit (sets t bit of 
   557                              <1> 			; / ps-trace trap)
   558                              <1> 		; rti   ;  / return from interrupt
   559                              <1> 	; 1: / interrupt char = del
   560                              <1> 		; clrb 6(r1) / clear the interrupt byte 
   561                              <1> 			   ; / in the buffer
   562                              <1> 		; mov (sp)+,r1 / restore r1
   563                              <1> 		; cmp u.intr,$core / should control be 
   564                              <1> 				; / transferred to loc core?
   565                              <1> 		; blo 1f
   566                              <1> 		; jmp *u.intr / user to do rti yes, 
   567                              <1> 				; / transfer to loc core
   568                              <1> 	; 1:
   569                              <1> 		; sys 1 / exit
   570                              <1> 
   571                              <1> sysexit: ; <terminate process>
   572                              <1> 	; 14/11/2017
   573                              <1> 	; 27/05/2017
   574                              <1> 	; 10/04/2017
   575                              <1> 	; 26/02/2017, 28/02/2017
   576                              <1> 	; 02/01/2017, 23/01/2017
   577                              <1> 	; 06/06/2016, 10/06/2016
   578                              <1> 	; 19/05/2016, 23/05/2016
   579                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   580                              <1> 	; 16/04/2015 - 01/09/2015 (Retro UNIX 386 v1)
   581                              <1> 	; 19/04/2013 - 14/02/2014 (Retro UNIX 8086 v1)
   582                              <1> 	;
   583                              <1> 	; 'sysexit' terminates a process. First each file that
   584                              <1> 	; the process has opened is closed by 'flose'. The process
   585                              <1> 	; status is then set to unused. The 'p.pid' table is then
   586                              <1> 	; searched to find children of the dying process. If any of
   587                              <1> 	; children are zombies (died by not waited for), they are
   588                              <1> 	; set free. The 'p.pid' table is then searched to find the
   589                              <1> 	; dying process's parent. When the parent is found, it is
   590                              <1> 	; checked to see if it is free or it is a zombie. If it is
   591                              <1> 	; one of these, the dying process just dies. If it is waiting
   592                              <1> 	; for a child process to die, it notified that it doesn't 
   593                              <1> 	; have to wait anymore by setting it's status from 2 to 1
   594                              <1> 	; (waiting to active). It is awakened and put on runq by
   595                              <1> 	; 'putlu'. The dying process enters a zombie state in which
   596                              <1> 	; it will never be run again but stays around until a 'wait'
   597                              <1> 	; is completed by it's parent process. If the parent is not
   598                              <1> 	; found, process just dies. This means 'swap' is called with
   599                              <1> 	; 'u.uno=0'. What this does is the 'wswap' is not called
   600                              <1> 	; to write out the process and 'rswap' reads the new process
   601                              <1> 	; over the one that dies..i.e., the dying process is 
   602                              <1> 	; overwritten and destroyed.	
   603                              <1>  	;
   604                              <1> 	; Calling sequence:
   605                              <1> 	;	sysexit or conditional branch.
   606                              <1> 	; Arguments:
   607                              <1> 	;	-	
   608                              <1> 	; ...............................................................
   609                              <1> 	;	
   610                              <1> 	; Retro UNIX 8086 v1 modification: 
   611                              <1> 	;       System call number (=1) is in EAX register.
   612                              <1> 	;
   613                              <1> 	;       Other parameters are in EDX, EBX, ECX, ESI, EDI, EBP
   614                              <1> 	;       registers depending of function details.
   615                              <1> 	;
   616                              <1> 	; ('swap' procedure is mostly different than original UNIX v1.)
   617                              <1> 	;
   618                              <1> ; / terminate process
   619                              <1> 	; AX = 1
   620 0000DA73 6648                <1> 	dec 	ax ; 0
   621 0000DA75 66A3[AA030300]      <1> 	mov	[u.intr], ax ; 0
   622                              <1> 		; clr u.intr / clear interrupt control word
   623                              <1> 		; clr r1 / clear r1
   624                              <1> sysexit_0:
   625                              <1> 	; 23/01/2017
   626                              <1> 	; 02/01/2017
   627                              <1> 	; 10/06/2016
   628                              <1> 	; 06/06/2016
   629                              <1> 	; 23/05/2016
   630                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
   631                              <1> 	; Check and stop/clear timer event(s) of this (dying) process
   632                              <1> 	; if there is.
   633                              <1> 
   634                              <1> 	; 02/01/2017 
   635 0000DA7B FA                  <1> 	cli	; disable interrupts
   636                              <1> 	; 23/01/2017 - reset timer frequency (to 18.2Hz)
   637 0000DA7C B036                <1> 	mov	al, 00110110b ; 36h
   638 0000DA7E E643                <1>  	out	43h, al
   639 0000DA80 28C0                <1> 	sub	al, al ; 0
   640 0000DA82 E640                <1> 	out	40h, al ; LB
   641 0000DA84 E640                <1> 	out	40h, al ; HB
   642                              <1>  	; 
   643 0000DA86 0FB61D[B3030300]    <1> 	movzx	ebx, byte [u.uno]
   644                              <1> 	;mov	bl, [u.uno] ; process number of dying process
   645 0000DA8D 3883[FF000300]      <1> 	cmp	byte [ebx+p.timer-1], al ; 0
   646 0000DA93 763A                <1> 	jna	short sysexit_12 ; no timer events for this process
   647 0000DA95 8883[FF000300]      <1> 	mov	byte [ebx+p.timer-1], al ; 0 ; reset
   648                              <1> 	;mov	al, [timer_events]
   649                              <1> 	;or	al, al
   650                              <1>  	;jz	short sysexit_12 ; no timer events
   651                              <1> 	;mov	cl, al
   652 0000DA9B 8A0D[238E0100]      <1> 	mov	cl, [timer_events] ; 14/11/2017
   653                              <1> 	;cli	; disable interrupts 
   654 0000DAA1 B410                <1> 	mov	ah, 16 ; number of available timer events
   655 0000DAA3 BE[60040300]        <1> 	mov	esi, timer_set ; beginning address of timer events
   656                              <1> sysexit_7:
   657 0000DAA8 8A06                <1> 	mov	al, [esi] ; process number (of timer event)
   658 0000DAAA 38D8                <1> 	cmp	al, bl ; process number comparison
   659 0000DAAC 7411                <1> 	je	short sysexit_10
   660 0000DAAE 20C0                <1> 	and	al, al
   661 0000DAB0 7404                <1> 	jz	short sysexit_9
   662                              <1> sysexit_8:
   663 0000DAB2 FEC9                <1> 	dec	cl
   664 0000DAB4 7416                <1> 	jz	short sysexit_11
   665                              <1> sysexit_9:
   666 0000DAB6 FECC                <1> 	dec	ah
   667 0000DAB8 7415                <1> 	jz	short sysexit_12
   668 0000DABA 83C610              <1> 	add	esi, 16
   669 0000DABD EBE9                <1> 	jmp	short sysexit_7
   670                              <1> 
   671                              <1> sysexit_10:
   672                              <1> 	;mov	byte [esi], 0
   673 0000DABF 66C7060000          <1> 	mov	word [esi], 0
   674                              <1> 	;mov	dword [esi+12], 0
   675                              <1> 	;
   676 0000DAC4 FE0D[238E0100]      <1> 	dec	byte [timer_events] ; 02/01/2017
   677                              <1> 	;
   678 0000DACA EBE6                <1> 	jmp	short sysexit_8
   679                              <1> 
   680                              <1> sysexit_11:
   681 0000DACC 6629C0              <1> 	sub	ax, ax ; 0 ; 26/02/2017
   682                              <1> sysexit_12:
   683                              <1> 	; 26/02/2017 (Unlink IRQ callbacks belong to the user)
   684 0000DACF 803D[D6030300]00    <1> 	cmp	byte [u.irqc], 0 ; Count of IRQ callbacks
   685 0000DAD6 7E2E                <1> 	jng	short sysexit_16 ; zero or invalid
   686                              <1> 	; 28/02/2017
   687                              <1> 	; clear IRQ callback flags (for 'sysrele' and 'sysret')
   688 0000DAD8 A2[D7030300]        <1> 	mov	[u.irqwait], al ; 0 ; force to clear waiting flag
   689 0000DADD A2[D8030300]        <1> 	mov	[u.r_lock], al ; 0 ; force to clear busy flag
   690 0000DAE2 BE[C2930100]        <1> 	mov	esi, IRQ.owner
   691                              <1> sysexit_13:	
   692 0000DAE7 AC                  <1> 	lodsb
   693 0000DAE8 3A05[B3030300]      <1> 	cmp	al, [u.uno] ; owner = current user ?
   694 0000DAEE 750C                <1> 	jne	short sysexit_14
   695 0000DAF0 C646FF00            <1> 	mov	byte [esi-1], 0 ; owner = 0 : Free
   696 0000DAF4 FE0D[D6030300]      <1> 	dec	byte [u.irqc]
   697 0000DAFA 7408                <1> 	jz	short sysexit_15
   698                              <1> sysexit_14:
   699 0000DAFC 81FE[CA930100]      <1> 	cmp	esi, IRQ.owner + 8 ; the last IRQ index number ?
   700 0000DB02 76E3                <1> 	jna	short sysexit_13 ; no
   701                              <1> sysexit_15:
   702 0000DB04 30C0                <1> 	xor	al, al ; 0
   703                              <1> sysexit_16: ; 2:
   704 0000DB06 FB                  <1> 	sti	; enable interrupts 
   705                              <1> 	;
   706                              <1> 	; AX = 0
   707                              <1> sysexit_1: ; 1:
   708                              <1> 	; AX = File descriptor
   709                              <1> 		; / r1 has file descriptor (index to u.fp list)
   710                              <1> 		; / Search the whole list
   711 0000DB07 E8912C0000          <1> 	call	fclose
   712                              <1> 		; jsr r0,fclose / close all files the process opened
   713                              <1> 	;; ignore error return
   714                              <1> 		; br .+2 / ignore error return
   715                              <1> 	;inc	ax
   716 0000DB0C FEC0                <1> 	inc	al
   717                              <1> 		; inc r1 / increment file descriptor
   718                              <1> 	;cmp	ax, 10
   719 0000DB0E 3C0A                <1> 	cmp	al, 10
   720                              <1> 		; cmp r1,$10. / end of u.fp list?
   721 0000DB10 72F5                <1> 	jb	short sysexit_1
   722                              <1> 		; blt 1b / no, go back
   723                              <1> 	;movzx	ebx, byte [u.uno]
   724 0000DB12 8A1D[B3030300]      <1> 	mov	bl, [u.uno] ; 02/01/2017
   725                              <1> 		; movb	u.uno,r1 / yes, move dying process's number to r1
   726 0000DB18 88A3[AF000300]      <1> 	mov	[ebx+p.stat-1], ah ; 0, SFREE
   727                              <1> 		; clrb p.stat-1(r1) / free the process
   728                              <1> 	; 10/04/2017
   729 0000DB1E 381D[39940100]      <1> 	cmp	[audio_user], bl
   730 0000DB24 7518                <1> 	jne	short sysexit_17
   731                              <1> 	; reset audio device (current) owner and 'initializated' flag
   732 0000DB26 883D[39940100]      <1> 	mov	[audio_user], bh ; 0
   733                              <1> 	; 27/05/2017
   734 0000DB2C 8B0D[24940100]      <1> 	mov	ecx,  [audio_buffer]
   735 0000DB32 09C9                <1> 	or	ecx, ecx
   736 0000DB34 7408                <1> 	jz	short sysexit_17
   737                              <1> 	; 'deallocate_user_pages' is not necessary in sysexit !!!
   738                              <1> 	;push	ebx
   739                              <1> 	;mov	ebx, ecx
   740                              <1> 	;mov	ecx, [audio_buff_size]
   741                              <1> 	;call	deallocate_user_pages
   742                              <1> 	;; (Modified Registers -> EAX, EDX, ESI, EDI, EBX, ECX, EBP)
   743 0000DB36 29C9                <1> 	sub	ecx, ecx
   744 0000DB38 890D[24940100]      <1> 	mov	[audio_buffer], ecx ; 0
   745                              <1> 	;pop	ebx
   746                              <1> sysexit_17:
   747                              <1> 	;shl	bx, 1
   748 0000DB3E D0E3                <1> 	shl	bl, 1
   749                              <1> 		; asl r1 / use r1 for index into the below tables
   750 0000DB40 668B8B[1E000300]    <1> 	mov	cx, [ebx+p.pid-2]
   751                              <1> 		; mov p.pid-2(r1),r3 / move dying process's name to r3
   752 0000DB47 668B93[3E000300]    <1> 	mov	dx, [ebx+p.ppid-2]
   753                              <1> 		; mov p.ppid-2(r1),r4 / move its parents name to r4
   754                              <1> 	; xor 	bx, bx ; 0
   755 0000DB4E 30DB                <1> 	xor	bl, bl ; 0
   756                              <1> 		; clr r2
   757 0000DB50 31F6                <1> 	xor	esi, esi ; 0
   758                              <1> 		; clr r5 / initialize reg
   759                              <1> sysexit_2: ; 1:
   760                              <1> 	        ; / find children of this dying process, 
   761                              <1> 		; / if they are zombies, free them
   762                              <1> 	;add	bx, 2
   763 0000DB52 80C302              <1> 	add	bl, 2
   764                              <1> 		; add $2,r2 / search parent process table 
   765                              <1> 		          ; / for dying process's name
   766 0000DB55 66398B[3E000300]    <1> 	cmp	[ebx+p.ppid-2], cx
   767                              <1> 		; cmp p.ppid-2(r2),r3 / found it?
   768 0000DB5C 7513                <1> 	jne	short sysexit_4
   769                              <1> 		; bne 3f / no
   770                              <1> 	;shr	bx, 1
   771 0000DB5E D0EB                <1> 	shr	bl, 1
   772                              <1> 		; asr r2 / yes, it is a parent
   773 0000DB60 80BB[AF000300]03    <1> 	cmp	byte [ebx+p.stat-1], 3 ; SZOMB
   774                              <1> 		; cmpb p.stat-1(r2),$3 / is the child of this 
   775                              <1> 				     ; / dying process a zombie
   776 0000DB67 7506                <1> 	jne	short sysexit_3 
   777                              <1> 		; bne 2f / no
   778 0000DB69 88A3[AF000300]      <1> 	mov	[ebx+p.stat-1], ah ; 0, SFREE
   779                              <1> 		; clrb p.stat-1(r2) / yes, free the child process
   780                              <1> sysexit_3: ; 2:
   781                              <1> 	;shr	bx, 1
   782 0000DB6F D0E3                <1> 	shl	bl, 1
   783                              <1> 		; asl r2
   784                              <1> sysexit_4: ; 3:
   785                              <1> 		; / search the process name table 
   786                              <1> 		; / for the dying process's parent
   787 0000DB71 663993[1E000300]    <1> 	cmp	[ebx+p.pid-2], dx
   788                              <1> 		; cmp p.pid-2(r2),r4 / found it?
   789 0000DB78 7502                <1> 	jne	short sysexit_5
   790                              <1> 		; bne 3f / no
   791 0000DB7A 89DE                <1> 	mov	esi, ebx
   792                              <1> 		; mov r2,r5 / yes, put index to p.pid table (parents
   793                              <1> 		          ; / process # x2) in r5
   794                              <1> sysexit_5: ; 3:
   795                              <1> 	;cmp	bx, nproc + nproc
   796 0000DB7C 80FB20              <1> 	cmp	bl, nproc + nproc
   797                              <1> 		; cmp r2,$nproc+nproc / has whole table been searched?
   798 0000DB7F 72D1                <1> 	jb	short sysexit_2
   799                              <1> 		; blt 1b / no, go back
   800                              <1> 		; mov r5,r1 / yes, r1 now has parents process # x2
   801 0000DB81 21F6                <1> 	and	esi, esi ; r5=r1
   802 0000DB83 7436                <1> 	jz	short sysexit_6
   803                              <1> 		; beq 2f / no parent has been found. 
   804                              <1> 		       ; / The process just dies
   805 0000DB85 66D1EE              <1> 	shr	si, 1
   806                              <1> 		; asr r1 / set up index to p.stat
   807 0000DB88 8A86[AF000300]      <1> 	mov	al, [esi+p.stat-1]
   808                              <1> 		; movb p.stat-1(r1),r2 / move status of parent to r2
   809 0000DB8E 20C0                <1> 	and	al, al
   810 0000DB90 7429                <1> 	jz	short sysexit_6
   811                              <1> 		; beq 2f / if its been freed, 2f
   812 0000DB92 3C03                <1> 	cmp	al, 3
   813                              <1> 		; cmp r2,$3 / is parent a zombie?
   814 0000DB94 7425                <1> 	je	short sysexit_6
   815                              <1> 		; beq 2f / yes, 2f
   816                              <1> 	; BH = 0
   817 0000DB96 8A1D[B3030300]      <1> 	mov	bl, [u.uno]
   818                              <1> 		; movb u.uno,r3 / move dying process's number to r3
   819 0000DB9C C683[AF000300]03    <1> 	mov	byte [ebx+p.stat-1], 3  ; SZOMB
   820                              <1> 		; movb $3,p.stat-1(r3) / make the process a zombie
   821 0000DBA3 3C01                <1> 	cmp	al, 1 ; SRUN
   822 0000DBA5 7414                <1> 	je	short sysexit_6
   823                              <1> 	;cmp	al, 2
   824                              <1> 		; cmp r2,$2 / is the parent waiting for 
   825                              <1> 			  ; / this child to die
   826                              <1> 	;jne	short sysexit_6	
   827                              <1> 		; bne 2f / yes, notify parent not to wait any more
   828                              <1> 	; p.stat = 2 --> waiting
   829                              <1> 	; p.stat = 4 --> sleeping
   830 0000DBA7 C686[AF000300]01    <1> 	mov	byte [esi+p.stat-1], 1 ; SRUN
   831                              <1> 	;dec	byte [esi+p.stat-1]
   832                              <1> 		; decb	p.stat-1(r1) / awaken it by putting it (parent)
   833 0000DBAE 6689F0              <1> 	mov	ax, si ; r1  (process number in AL)
   834                              <1> 	; 
   835                              <1> 	;mov	ebx, runq + 4
   836                              <1> 		; mov $runq+4,r2 / on the runq
   837 0000DBB1 BB[54030300]        <1> 	mov	ebx, runq+2 ; normal run queue ; 02/01/2017
   838 0000DBB6 E82D360000          <1> 	call	putlu
   839                              <1> 		; jsr r0, putlu
   840                              <1> sysexit_6: 
   841                              <1> 		; / the process dies
   842 0000DBBB C605[B3030300]00    <1> 	mov	byte [u.uno], 0
   843                              <1> 		; clrb u.uno / put zero as the process number, 
   844                              <1> 	           ; / so "swap" will
   845 0000DBC2 E823350000          <1> 	call	swap
   846                              <1> 		; jsr r0,swap / overwrite process with another process
   847                              <1> hlt_sys:
   848                              <1> 	;sti
   849                              <1> hlts0:
   850 0000DBC7 F4                  <1> 	hlt
   851 0000DBC8 EBFD                <1> 	jmp	short hlts0
   852                              <1> 		; 0 / and thereby kill it; halt?
   853                              <1> 
   854                              <1> syswait: ; < wait for a processs to die >
   855                              <1> 	; 17/09/2015
   856                              <1> 	; 02/09/2015
   857                              <1> 	; 01/09/2015
   858                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - Beginning)
   859                              <1> 	; 24/05/2013 - 05/02/2014 (Retro UNIX 8086 v1)
   860                              <1> 	;
   861                              <1> 	; 'syswait' waits for a process die. 
   862                              <1> 	; It works in following way:
   863                              <1> 	;    1) From the parent process number, the parent's 
   864                              <1> 	; 	process name is found. The p.ppid table of parent
   865                              <1> 	;	names is then searched for this process name.
   866                              <1> 	;	If a match occurs, r2 contains child's process
   867                              <1> 	;	number. The child status is checked to see if it is
   868                              <1> 	;	a zombie, i.e; dead but not waited for (p.stat=3)
   869                              <1> 	;	If it is, the child process is freed and it's name
   870                              <1> 	;	is put in (u.r0). A return is then made via 'sysret'.
   871                              <1> 	;	If the child is not a zombie, nothing happens and
   872                              <1> 	;	the search goes on through the p.ppid table until
   873                              <1> 	;	all processes are checked or a zombie is found.
   874                              <1> 	;    2) If no zombies are found, a check is made to see if
   875                              <1> 	;	there are any children at all. If there are none,
   876                              <1> 	;	an error return is made. If there are, the parent's
   877                              <1> 	;	status is set to 2 (waiting for child to die),
   878                              <1> 	;	the parent is swapped out, and a branch to 'syswait'
   879                              <1> 	;	is made to wait on the next process.
   880                              <1> 	;
   881                              <1> 	; Calling sequence:
   882                              <1> 	;	?
   883                              <1> 	; Arguments:
   884                              <1> 	;	-
   885                              <1> 	; Inputs: - 
   886                              <1> 	; Outputs: if zombie found, it's name put in u.r0.	
   887                              <1> 	; ...............................................................
   888                              <1> 	;				
   889                              <1> 	
   890                              <1> ; / wait for a process to die
   891                              <1> 
   892                              <1> syswait_0:
   893 0000DBCA 0FB61D[B3030300]    <1> 	movzx	ebx, byte [u.uno] ; 01/09/2015
   894                              <1> 		; movb u.uno,r1 / put parents process number in r1
   895 0000DBD1 D0E3                <1> 	shl	bl, 1
   896                              <1> 	;shl	bx, 1
   897                              <1> 		; asl r1 / x2 to get index into p.pid table
   898 0000DBD3 668B83[1E000300]    <1> 	mov	ax, [ebx+p.pid-2]
   899                              <1> 		; mov p.pid-2(r1),r1 / get the name of this process
   900 0000DBDA 31F6                <1> 	xor	esi, esi
   901                              <1> 		; clr r2
   902 0000DBDC 31C9                <1> 	xor	ecx, ecx ; 30/10/2013
   903                              <1> 	;xor 	cl, cl
   904                              <1> 		; clr r3 / initialize reg 3
   905                              <1> syswait_1: ; 1:
   906 0000DBDE 6683C602            <1> 	add	si, 2
   907                              <1> 		; add $2,r2 / use r2 for index into p.ppid table
   908                              <1> 			  ; / search table of parent processes 
   909                              <1> 			  ; / for this process name
   910 0000DBE2 663B86[3E000300]    <1> 	cmp	ax, [esi+p.ppid-2]
   911                              <1> 		; cmp p.ppid-2(r2),r1 / r2 will contain the childs 
   912                              <1> 			            ; / process number
   913 0000DBE9 7535                <1> 	jne	short syswait_3
   914                              <1> 		;bne 3f / branch if no match of parent process name
   915                              <1> 	;inc	cx
   916 0000DBEB FEC1                <1> 	inc	cl
   917                              <1> 		;inc r3 / yes, a match, r3 indicates number of children
   918 0000DBED 66D1EE              <1> 	shr	si, 1
   919                              <1> 		; asr r2 / r2/2 to get index to p.stat table
   920                              <1> 	; The possible states ('p.stat' values) of a process are:
   921                              <1> 	;	0 = free or unused
   922                              <1> 	;	1 = active
   923                              <1> 	;	2 = waiting for a child process to die
   924                              <1> 	;	3 = terminated, but not yet waited for (zombie).	
   925 0000DBF0 80BE[AF000300]03    <1> 	cmp	byte [esi+p.stat-1], 3 ; SZOMB, 05/02/2014
   926                              <1> 		; cmpb p.stat-1(r2),$3 / is the child process a zombie?
   927 0000DBF7 7524                <1> 	jne	short syswait_2
   928                              <1> 		; bne 2f / no, skip it
   929 0000DBF9 88BE[AF000300]      <1> 	mov	[esi+p.stat-1], bh ; 0
   930                              <1> 		; clrb p.stat-1(r2) / yes, free it
   931 0000DBFF 66D1E6              <1> 	shl	si, 1
   932                              <1> 		; asl r2 / r2x2 to get index into p.pid table
   933 0000DC02 0FB786[1E000300]    <1> 	movzx	eax, word [esi+p.pid-2]
   934 0000DC09 A3[64030300]        <1> 	mov	[u.r0], eax
   935                              <1> 		; mov p.pid-2(r2),*u.r0 
   936                              <1> 			      ; / put childs process name in (u.r0)
   937                              <1> 	;
   938                              <1> 	; Retro UNIX 386 v1 modification ! (17/09/2015)
   939                              <1> 	;
   940                              <1> 	; Parent process ID -p.ppid- field (of the child process)
   941                              <1> 	; must be cleared in order to prevent infinitive 'syswait'
   942                              <1> 	; system call loop from the application/program if it calls
   943                              <1> 	; 'syswait' again (mistakenly) while there is not a zombie
   944                              <1> 	; or running child process to wait. ('forktest.s', 17/09/2015)
   945                              <1> 	;
   946                              <1> 	; Note: syswait will return with error if there is not a
   947                              <1> 	;       zombie or running process to wait.	
   948                              <1> 	;
   949 0000DC0E 6629C0              <1> 	sub	ax, ax
   950 0000DC11 668986[3E000300]    <1> 	mov 	[esi+p.ppid-2], ax ; 0 ; 17/09/2015
   951 0000DC18 E9D1FCFFFF          <1> 	jmp	sysret0 ; ax = 0
   952                              <1> 	;
   953                              <1> 	;jmp	sysret
   954                              <1> 		; br sysret1 / return cause child is dead
   955                              <1> syswait_2: ; 2:
   956 0000DC1D 66D1E6              <1> 	shl	si, 1
   957                              <1> 		; asl r2 / r2x2 to get index into p.ppid table
   958                              <1> syswait_3: ; 3:
   959 0000DC20 6683FE20            <1> 	cmp	si, nproc+nproc
   960                              <1> 		; cmp r2,$nproc+nproc / have all processes been checked?
   961 0000DC24 72B8                <1> 	jb	short syswait_1
   962                              <1> 		; blt 1b / no, continue search
   963                              <1> 	;and	cx, cx
   964 0000DC26 20C9                <1> 	and	cl, cl
   965                              <1> 		; tst r3 / one gets here if there are no children 
   966                              <1> 		       ; / or children that are still active
   967                              <1> 	; 30/10/2013
   968 0000DC28 750B                <1> 	jnz	short syswait_4
   969                              <1> 	;jz	error
   970                              <1> 		; beq error1 / there are no children, error
   971 0000DC2A 890D[64030300]      <1> 	mov	[u.r0], ecx ; 0
   972 0000DC30 E997FCFFFF          <1> 	jmp	error
   973                              <1> syswait_4:
   974 0000DC35 8A1D[B3030300]      <1> 	mov	bl, [u.uno]
   975                              <1> 		; movb u.uno,r1 / there are children so put 
   976                              <1> 			      ; / parent process number in r1
   977 0000DC3B FE83[AF000300]      <1> 	inc	byte [ebx+p.stat-1] ; 2, SWAIT, 05/02/2014
   978                              <1> 		; incb p.stat-1(r1) / it is waiting for 
   979                              <1> 				  ; / other children to die
   980                              <1> 	; 04/11/2013
   981 0000DC41 E8A4340000          <1> 	call	swap
   982                              <1> 		; jsr r0,swap / swap it out, because it's waiting
   983 0000DC46 EB82                <1> 	jmp	syswait_0
   984                              <1> 		; br syswait / wait on next process
   985                              <1> 
   986                              <1> sysfork: ; < create a new process >
   987                              <1> 	; 02/01/2017 (TRDOS 386 modification)
   988                              <1> 	; 04/09/2015, 18/05/2015
   989                              <1> 	; 28/08/2015, 01/09/2015, 02/09/2015
   990                              <1> 	; 09/05/2015, 10/05/2015, 14/05/2015
   991                              <1> 	; 06/05/2015 (Retro UNIX 386 v1 - Beginning)
   992                              <1> 	; 24/05/2013 - 14/02/2014 (Retro UNIX 8086 v1)
   993                              <1> 	;
   994                              <1> 	; 'sysfork' creates a new process. This process is referred
   995                              <1> 	; to as the child process. This new process core image is
   996                              <1> 	; a copy of that of the caller of 'sysfork'. The only
   997                              <1> 	; distinction is the return location and the fact that (u.r0)
   998                              <1> 	; in the old process (parent) contains the process id (p.pid)
   999                              <1> 	; of the new process (child). This id is used by 'syswait'.
  1000                              <1> 	; 'sysfork' works in the following manner: 	
  1001                              <1> 	;    1) The process status table (p.stat) is searched to find
  1002                              <1> 	;	a process number that is unused. If none are found
  1003                              <1> 	;	an error occurs.
  1004                              <1> 	;    2) when one is found, it becomes the child process number
  1005                              <1> 	;	and it's status (p.stat) is set to active.
  1006                              <1> 	;    3) If the parent had a control tty, the interrupt 
  1007                              <1> 	;	character in that tty buffer is cleared.
  1008                              <1> 	;    4) The child process is put on the lowest priority run 
  1009                              <1> 	;	queue via 'putlu'.
  1010                              <1> 	;    5) A new process name is gotten from 'mpid' (actually 
  1011                              <1> 	;	it is a unique number) and is put in the child's unique
  1012                              <1> 	;	identifier; process id (p.pid).
  1013                              <1> 	;    6) The process name of the parent is then obtained and
  1014                              <1> 	;	placed in the unique identifier of the parent process
  1015                              <1> 	;	name is then put in 'u.r0'.	
  1016                              <1> 	;    7) The child process is then written out on disk by
  1017                              <1> 	;	'wswap',i.e., the parent process is copied onto disk
  1018                              <1> 	;	and the child is born. (The child process is written 
  1019                              <1> 	;	out on disk/drum with 'u.uno' being the child process
  1020                              <1> 	;	number.)
  1021                              <1> 	;    8) The parent process number is then restored to 'u.uno'.
  1022                              <1> 	;    9) The child process name is put in 'u.r0'.
  1023                              <1> 	;   10) The pc on the stack sp + 18 is incremented by 2 to
  1024                              <1> 	;	create the return address for the parent process.
  1025                              <1> 	;   11) The 'u.fp' list as then searched to see what files
  1026                              <1> 	;	the parent has opened. For each file the parent has
  1027                              <1> 	;	opened, the corresponding 'fsp' entry must be updated
  1028                              <1> 	;	to indicate that the child process also has opened
  1029                              <1> 	;	the file. A branch to 'sysret' is then made.	 			 				
  1030                              <1> 	;
  1031                              <1> 	; Calling sequence:
  1032                              <1> 	;	from shell ?
  1033                              <1> 	; Arguments:
  1034                              <1> 	;	-
  1035                              <1> 	; Inputs: -
  1036                              <1> 	; Outputs: *u.r0 - child process name
  1037                              <1> 	; ...............................................................
  1038                              <1> 	;	
  1039                              <1> 	; Retro UNIX 8086 v1 modification: 
  1040                              <1> 	;	AX = r0 = PID (>0) (at the return of 'sysfork')
  1041                              <1> 	;	= process id of child a parent process returns
  1042                              <1> 	;	= process id of parent when a child process returns
  1043                              <1> 	;
  1044                              <1> 	;       In original UNIX v1, sysfork is called and returns as
  1045                              <1> 	;	in following manner: (with an example: c library, fork)
  1046                              <1> 	;	
  1047                              <1> 	;	1:
  1048                              <1> 	;		sys	fork
  1049                              <1> 	;			br 1f  / child process returns here
  1050                              <1> 	;		bes	2f     / parent process returns here
  1051                              <1> 	;		/ pid of new process in r0
  1052                              <1> 	;		rts	pc
  1053                              <1> 	;	2: / parent process condionally branches here
  1054                              <1> 	;		mov	$-1,r0 / pid = -1 means error return
  1055                              <1> 	;		rts	pc
  1056                              <1> 	;
  1057                              <1> 	;	1: / child process brances here
  1058                              <1> 	;		clr	r0   / pid = 0 in child process
  1059                              <1> 	;		rts	pc
  1060                              <1> 	;
  1061                              <1> 	;	In UNIX v7x86 (386) by Robert Nordier (1999)
  1062                              <1> 	;		// pid = fork();
  1063                              <1> 	;		//
  1064                              <1> 	;		// pid == 0 in child process; 
  1065                              <1> 	;		// pid == -1 means error return
  1066                              <1> 	;		// in child, 
  1067                              <1> 	;		//	parents id is in par_uid if needed
  1068                              <1> 	;		
  1069                              <1> 	;		_fork:
  1070                              <1> 	;			mov	$.fork,eax
  1071                              <1> 	;			int	$0x30
  1072                              <1> 	;			jmp	1f
  1073                              <1> 	;			jnc	2f
  1074                              <1> 	;			jmp	cerror
  1075                              <1> 	;		1:
  1076                              <1> 	;			mov	eax,_par_uid
  1077                              <1> 	;			xor	eax,eax
  1078                              <1> 	;		2:
  1079                              <1> 	;			ret
  1080                              <1> 	;
  1081                              <1> 	;	In Retro UNIX 8086 v1,
  1082                              <1> 	;	'sysfork' returns in following manner:
  1083                              <1> 	;	
  1084                              <1> 	;		mov	ax, sys_fork
  1085                              <1> 	;		mov	bx, offset @f ; routine for child
  1086                              <1> 	;		int	20h
  1087                              <1> 	;		jc	error
  1088                              <1> 	;		
  1089                              <1> 	;	; Routine for parent process here (just after 'jc')
  1090                              <1> 	;		mov	word ptr [pid_of_child], ax
  1091                              <1> 	;		jmp	next_routine_for_parent	
  1092                              <1> 	;
  1093                              <1> 	;	@@: ; routine for child process here				
  1094                              <1> 	;		....	
  1095                              <1> 	;	NOTE: 'sysfork' returns to specified offset
  1096                              <1> 	;	       for child process by using BX input.
  1097                              <1> 	;	      (at first, parent process will return then 
  1098                              <1> 	;	      child process will return -after swapped in-
  1099                              <1> 	;	      'syswait' is needed in parent process
  1100                              <1> 	;	      if return from child process will be waited for.)
  1101                              <1> 	;	  				
  1102                              <1> 	
  1103                              <1> ; / create a new process
  1104                              <1> 	; EBX = return address for child process 
  1105                              <1> 	     ; (Retro UNIX 8086 v1 modification !)
  1106 0000DC48 31F6                <1> 	xor 	esi, esi
  1107                              <1> 		; clr r1
  1108                              <1> sysfork_1: ; 1: / search p.stat table for unused process number
  1109 0000DC4A 46                  <1> 	inc	esi
  1110                              <1> 		; inc r1
  1111 0000DC4B 80BE[AF000300]00    <1> 	cmp	byte [esi+p.stat-1], 0 ; SFREE, 05/02/2014
  1112                              <1> 		; tstb p.stat-1(r1) / is process active, unused, dead
  1113 0000DC52 760B                <1> 	jna	short sysfork_2	
  1114                              <1> 		; beq 1f / it's unused so branch
  1115 0000DC54 6683FE10            <1> 	cmp	si, nproc
  1116                              <1> 		; cmp r1,$nproc / all processes checked
  1117 0000DC58 72F0                <1> 	jb	short sysfork_1
  1118                              <1> 		; blt 1b / no, branch back
  1119                              <1> 	;
  1120                              <1> 	; Retro UNIX 8086 v1. modification:
  1121                              <1> 	;	Parent process returns from 'sysfork' to address 
  1122                              <1> 	;	which is just after 'sysfork' system call in parent
  1123                              <1> 	;	process. Child process returns to address which is put
  1124                              <1> 	;	in BX register by parent process for 'sysfork'. 
  1125                              <1> 	;
  1126                              <1> 		;add $2,18.(sp) / add 2 to pc when trap occured, points
  1127                              <1> 		             ; / to old process return
  1128                              <1> 		; br error1 / no room for a new process
  1129 0000DC5A E96DFCFFFF          <1> 	jmp	error
  1130                              <1> sysfork_2: ; 1:
  1131 0000DC5F E8657FFFFF          <1> 	call	allocate_page
  1132 0000DC64 0F8262FCFFFF        <1> 	jc	error
  1133 0000DC6A 50                  <1> 	push	eax   ; UPAGE (user structure page) address
  1134                              <1> 	; Retro UNIX 386 v1 modification!
  1135 0000DC6B E86881FFFF          <1> 	call	duplicate_page_dir
  1136                              <1> 		; EAX = New page directory 
  1137 0000DC70 730B                <1> 	jnc	short sysfork_3
  1138 0000DC72 58                  <1> 	pop	eax   ; UPAGE (user structure page) address
  1139 0000DC73 E82F81FFFF          <1> 	call 	deallocate_page
  1140 0000DC78 E94FFCFFFF          <1> 	jmp	error
  1141                              <1> sysfork_3:
  1142                              <1> 	; Retro UNIX 386 v1 modification !
  1143 0000DC7D 56                  <1> 	push	esi
  1144 0000DC7E E8F5340000          <1> 	call	wswap ; save current user (u) structure, user registers
  1145                              <1> 		      ; and interrupt return components (for IRET)
  1146 0000DC83 8705[B8030300]      <1> 	xchg	eax, [u.pgdir] ; page directory of the child process
  1147 0000DC89 A3[BC030300]        <1> 	mov	[u.ppgdir], eax ; page directory of the parent process
  1148 0000DC8E 5E                  <1> 	pop	esi
  1149 0000DC8F 58                  <1> 	pop	eax   ; UPAGE (user structure page) address
  1150                              <1> 		; [u.usp] = esp
  1151 0000DC90 89F7                <1> 	mov	edi, esi
  1152 0000DC92 66C1E702            <1> 	shl	di, 2
  1153 0000DC96 8987[BC000300]      <1> 	mov	[edi+p.upage-4], eax ; memory page for 'user' struct
  1154 0000DC9C A3[B4030300]        <1> 	mov	[u.upage], eax ; memory page for 'user' struct (child)
  1155                              <1> 	; 28/08/2015
  1156 0000DCA1 0FB605[B3030300]    <1> 	movzx	eax, byte [u.uno] ; parent process number
  1157                              <1> 		; movb u.uno,-(sp) / save parent process number
  1158 0000DCA8 89C7                <1> 	mov	edi, eax
  1159 0000DCAA 50                  <1>         push	eax ; ** 
  1160 0000DCAB 8A87[7F000300]      <1> 	mov     al, [edi+p.ttyc-1] ; console tty (parent)
  1161                              <1> 	; 18/09/2015
  1162                              <1> 	;mov     [esi+p.ttyc-1], al ; set child's console tty
  1163                              <1> 	;mov     [esi+p.waitc-1], ah ; 0 ; reset child's wait channel
  1164 0000DCB1 668986[7F000300]    <1> 	mov     [esi+p.ttyc-1], ax ; al - set child's console tty
  1165                              <1> 				   ; ah - reset child's wait channel	
  1166 0000DCB8 89F0                <1> 	mov	eax, esi
  1167 0000DCBA A2[B3030300]        <1> 	mov	[u.uno], al ; child process number
  1168                              <1> 		;movb r1,u.uno / set child process number to r1
  1169 0000DCBF FE86[AF000300]      <1>         inc     byte [esi+p.stat-1] ; 1, SRUN, 05/02/2014
  1170                              <1> 		; incb p.stat-1(r1) / set p.stat entry for child 
  1171                              <1> 				; / process to active status
  1172                              <1> 		; mov u.ttyp,r2 / put pointer to parent process' 
  1173                              <1> 			      ; / control tty buffer in r2
  1174                              <1>                 ; beq 2f / branch, if no such tty assigned
  1175                              <1> 		; clrb 6(r2) / clear interrupt character in tty buffer
  1176                              <1> 	; 2:
  1177 0000DCC5 53                  <1> 	push	ebx  ; * return address for the child process
  1178                              <1> 		     ; * Retro UNIX 8086 v1 feature only !	
  1179                              <1> 	; (Retro UNIX 8086 v1 modification!)
  1180                              <1> 		; mov $runq+4,r2
  1181 0000DCC6 BB[54030300]        <1> 	mov	ebx, runq+2 ; normal run queue ; 02/01/2017  
  1182 0000DCCB E818350000          <1> 	call	putlu
  1183                              <1>  		; jsr r0,putlu / put child process on lowest priority 
  1184                              <1> 			   ; / run queue
  1185 0000DCD0 66D1E6              <1> 	shl	si, 1
  1186                              <1> 		; asl r1 / multiply r1 by 2 to get index 
  1187                              <1> 		       ; / into p.pid table
  1188 0000DCD3 66FF05[4E030300]    <1> 	inc	word [mpid]
  1189                              <1> 		; inc mpid / increment m.pid; get a new process name
  1190 0000DCDA 66A1[4E030300]      <1> 	mov	ax, [mpid]
  1191 0000DCE0 668986[1E000300]    <1> 	mov	[esi+p.pid-2], ax
  1192                              <1> 		;mov mpid,p.pid-2(r1) / put new process name 
  1193                              <1> 				    ; / in child process' name slot
  1194 0000DCE7 5A                  <1> 	pop	edx  ; * return address for the child process
  1195                              <1> 		     ; * Retro UNIX 8086 v1 feature only !	
  1196 0000DCE8 5B                  <1>   	pop	ebx  ; **
  1197                              <1> 	;mov	ebx, [esp] ; ** parent process number
  1198                              <1> 		; movb (sp),r2 / put parent process number in r2
  1199 0000DCE9 66D1E3              <1> 	shl 	bx, 1
  1200                              <1> 		;asl r2 / multiply by 2 to get index into below tables
  1201                              <1> 	;movzx eax, word [ebx+p.pid-2]
  1202 0000DCEC 668B83[1E000300]    <1> 	mov	ax, [ebx+p.pid-2]
  1203                              <1> 		; mov p.pid-2(r2),r2 / get process name of parent
  1204                              <1> 				   ; / process
  1205 0000DCF3 668986[3E000300]    <1> 	mov	[esi+p.ppid-2], ax
  1206                              <1> 		; mov r2,p.ppid-2(r1) / put parent process name 
  1207                              <1> 			  ; / in parent process slot for child
  1208 0000DCFA A3[64030300]        <1> 	mov	[u.r0], eax	
  1209                              <1> 		; mov r2,*u.r0 / put parent process name on stack 
  1210                              <1> 			     ; / at location where r0 was saved
  1211 0000DCFF 8B2D[5C030300]      <1> 	mov 	ebp, [u.sp] ; points to return address (EIP for IRET)
  1212 0000DD05 895500              <1> 	mov	[ebp], edx ; *, CS:EIP -> EIP
  1213                              <1> 			   ; * return address for the child process
  1214                              <1> 		; mov $sysret1,-(sp) /
  1215                              <1> 		; mov sp,u.usp / contents of sp at the time when 
  1216                              <1> 			      ; / user is swapped out
  1217                              <1> 		; mov $sstack,sp / point sp to swapping stack space
  1218                              <1> 	; 04/09/2015 - 01/09/2015
  1219                              <1> 	; [u.usp] = esp
  1220 0000DD08 68[ECD80000]        <1> 	push	sysret ; ***
  1221 0000DD0D 8925[60030300]      <1> 	mov	[u.usp], esp ; points to 'sysret' address (***)
  1222                              <1> 			     ; (for child process)	
  1223 0000DD13 31C0                <1> 	xor 	eax, eax
  1224 0000DD15 66A3[94030300]      <1> 	mov 	[u.ttyp], ax ; 0
  1225                              <1> 	;
  1226 0000DD1B E858340000          <1> 	call	wswap ; Retro UNIX 8086 v1 modification !
  1227                              <1> 		;jsr r0,wswap / put child process out on drum
  1228                              <1> 		;jsr r0,unpack / unpack user stack
  1229                              <1> 		;mov u.usp,sp / restore user stack pointer
  1230                              <1> 		; tst (sp)+ / bump stack pointer
  1231                              <1> 	; Retro UNIX 386 v1 modification !
  1232 0000DD20 58                  <1> 	pop	eax ; ***
  1233 0000DD21 66D1E3              <1> 	shl	bx, 1
  1234 0000DD24 8B83[BC000300]      <1> 	mov     eax, [ebx+p.upage-4] ; UPAGE address ; 14/05/2015
  1235 0000DD2A E881340000          <1> 	call	rswap ; restore parent process 'u' structure, 
  1236                              <1> 		      ; registers and return address (for IRET)
  1237                              <1> 		;movb (sp)+,u.uno / put parent process number in u.uno
  1238 0000DD2F 0FB705[4E030300]    <1>         movzx   eax, word [mpid]
  1239 0000DD36 A3[64030300]        <1> 	mov	[u.r0], eax
  1240                              <1> 		; mov mpid,*u.r0 / put child process name on stack 
  1241                              <1> 			       ; / where r0 was saved
  1242                              <1> 		; add $2,18.(sp) / add 2 to pc on stack; gives parent
  1243                              <1> 			          ; / process return
  1244                              <1> 	;xor	ebx, ebx
  1245 0000DD3B 31F6                <1> 	xor     esi, esi
  1246                              <1> 		;clr r1
  1247                              <1> sysfork_4: ; 1: / search u.fp list to find the files 
  1248                              <1> 	      ; / opened by the parent process
  1249                              <1> 	; 01/09/2015
  1250                              <1> 	;xor	bh, bh
  1251                              <1> 	;mov 	bl, [esi+u.fp]
  1252 0000DD3D 8A86[6A030300]      <1> 	mov 	al, [esi+u.fp]
  1253                              <1> 		; movb u.fp(r1),r2 / get an open file for this process
  1254                              <1>         ;or      bl, bl
  1255 0000DD43 08C0                <1> 	or	al, al
  1256 0000DD45 740D                <1> 	jz	short sysfork_5	
  1257                              <1> 		; beq 2f / file has not been opened by parent, 
  1258                              <1> 		       ; / so branch
  1259 0000DD47 B40A                <1> 	mov	ah, 10 ; Retro UNIX 386 v1 fsp structure size = 10 bytes
  1260 0000DD49 F6E4                <1> 	mul	ah
  1261                              <1> 	;movzx	ebx, ax
  1262 0000DD4B 6689C3              <1> 	mov	bx, ax
  1263                              <1> 	;shl     bx, 3
  1264                              <1> 		; asl r2 / multiply by 8
  1265                              <1>        		; asl r2 / to get index into fsp table
  1266                              <1>        		; asl r2
  1267 0000DD4E FE83[4E010300]      <1>   	inc     byte [ebx+fsp-2]
  1268                              <1> 		; incb fsp-2(r2) / increment number of processes
  1269                              <1> 			     ; / using file, because child will now be
  1270                              <1> 			     ; / using this file
  1271                              <1> sysfork_5: ; 2:
  1272 0000DD54 46                  <1>         inc     esi
  1273                              <1> 		; inc r1 / get next open file
  1274 0000DD55 6683FE0A            <1>         cmp     si, 10
  1275                              <1> 		; cmp r1,$10. / 10. files is the maximum number which
  1276                              <1> 			  ; / can be opened
  1277 0000DD59 72E2                <1> 	jb	short sysfork_4	
  1278                              <1> 		; blt 1b / check next entry
  1279 0000DD5B E98CFBFFFF          <1> 	jmp	sysret
  1280                              <1> 		; br sysret1
  1281                              <1> 
  1282                              <1> syscreat: ; < create file >
  1283                              <1> 	; 13/11/2017
  1284                              <1> 	; 27/10/2016
  1285                              <1> 	; 25/10/2016, 26/10/2016
  1286                              <1> 	; 15/10/2016, 16/10/2016, 17/10/2016
  1287                              <1> 	; 10/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1288                              <1> 	;	     -derived from INT_21H.ASM-
  1289                              <1> 	;            ("loc_INT21h_create_file")
  1290                              <1>         ; 	10/07/2011 (12/03/2011)
  1291                              <1>         ;	INT 21h Function AH = 3Ch
  1292                              <1>         ;	Create File
  1293                              <1>         ;	INPUT
  1294                              <1>         ;	   CX = Attributes
  1295                              <1>         ;          DS:DX= Address of zero terminaned path name
  1296                              <1>         ;
  1297                              <1> 	; 27/12/2015 (Retro UNIX 386 v1.1)
  1298                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1299                              <1> 	; 27/05/2013 (Retro UNIX 8086 v1)
  1300                              <1> 	;
  1301                              <1> 	; 'syscreat' called with two arguments; name and mode.
  1302                              <1> 	; u.namep points to name of the file and mode is put
  1303                              <1> 	; on the stack. 'namei' is called to get i-number of the file.		
  1304                              <1> 	; If the file aready exists, it's mode and owner remain 
  1305                              <1> 	; unchanged, but it is truncated to zero length. If the file
  1306                              <1> 	; did not exist, an i-node is created with the new mode via
  1307                              <1> 	; 'maknod' whether or not the file already existed, it is
  1308                              <1> 	; open for writing. The fsp table is then searched for a free
  1309                              <1> 	; entry. When a free entry is found, proper data is placed
  1310                              <1> 	; in it and the number of this entry is put in the u.fp list.
  1311                              <1> 	; The index to the u.fp (also know as the file descriptor)
  1312                              <1> 	; is put in the user's r0. 			
  1313                              <1> 	;
  1314                              <1> 	; Calling sequence:
  1315                              <1> 	;	syscreate; name; mode
  1316                              <1> 	; Arguments:
  1317                              <1> 	;	name - name of the file to be created
  1318                              <1> 	;	mode - mode of the file to be created
  1319                              <1> 	; Inputs: (arguments)
  1320                              <1> 	; Outputs: *u.r0 - index to u.fp list 
  1321                              <1> 	;		   (the file descriptor of new file)
  1322                              <1> 	; ...............................................................
  1323                              <1> 	;				
  1324                              <1> 	; Retro UNIX 8086 v1 modification: 
  1325                              <1> 	;       'syscreate' system call has two arguments; so,
  1326                              <1> 	;	* 1st argument, name is pointed to by BX register
  1327                              <1> 	;	* 2nd argument, mode is in CX register
  1328                              <1> 	;
  1329                              <1> 	;	AX register (will be restored via 'u.r0') will return
  1330                              <1> 	;	to the user with the file descriptor/number 
  1331                              <1> 	;	(index to u.fp list).
  1332                              <1> 	;
  1333                              <1> 	;call	arg2
  1334                              <1> 	; * name - 'u.namep' points to address of file/path name
  1335                              <1> 	;          in the user's program segment ('u.segmnt')
  1336                              <1> 	;          with offset in BX register (as sysopen argument 1).
  1337                              <1> 	; * mode - sysopen argument 2 is in CX register 
  1338                              <1> 	;          which is on top of stack.
  1339                              <1> 	;
  1340                              <1> 	; TRDOS 386 (10/10/2016)
  1341                              <1> 	;	
  1342                              <1>         ; INPUT ->
  1343                              <1>         ;	   CL = File Attributes
  1344                              <1> 	;     	      bit 0 (1) - Read only file (R)
  1345                              <1> 	;             bit 1 (1) - Hidden file (H)
  1346                              <1>         ;             bit 2 (1) - System file (R)
  1347                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1348                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1349                              <1> 	;	      bit 5 (1) - File has been archived (A)	 	
  1350                              <1>         ;          EBX = Pointer to filename (ASCIIZ) -path-
  1351                              <1> 	;	
  1352                              <1> 	; OUTPUT ->
  1353                              <1> 	;          eax = File/Device Handle/Number (index) (AL)
  1354                              <1> 	;          cf = 1 -> Error code in AL
  1355                              <1> 	;
  1356                              <1> 	; Modified Registers: EAX (at the return of system call)
  1357                              <1> 	;  
  1358                              <1> 	; Note: If the file is existing and it has not any one
  1359                              <1> 	;	of S,H,R,V,D attributes, it will be truncated 
  1360                              <1> 	;	to zero length; otherwise, access error will be 
  1361                              <1> 	;	returned. 
  1362                              <1> 
  1363                              <1> sysmkdir_0:
  1364 0000DD60 F6C108              <1> 	test	cl, 08h ; Volume name 
  1365 0000DD63 740A                <1> 	jz	short syscreat_0
  1366                              <1> 
  1367                              <1> 	; Volume name or long name creation
  1368                              <1> 	; is not permitted (in TRDOS 386)!
  1369 0000DD65 B80B000000          <1> 	mov	eax, ERR_FILE_ACCESS  ; 11 ; 'permission denied !'
  1370 0000DD6A E926020000          <1>         jmp	sysopen_dev_err
  1371                              <1> 
  1372                              <1> syscreat_0:
  1373                              <1>         ;mov	[u.namep], ebx
  1374 0000DD6F 51                  <1> 	push	ecx
  1375 0000DD70 89DE                <1> 	mov	esi, ebx
  1376                              <1> 	; file name is forced, change directory as temporary
  1377                              <1> 	;mov	ax, 1
  1378                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
  1379                              <1> 	;call	set_working_path 
  1380 0000DD72 E8C9490000          <1> 	call	set_working_path_x ; 17/10/2016	
  1381 0000DD77 0F82D7000000        <1> 	jc	syscreat_err
  1382                              <1> 
  1383                              <1> 	; 16/10/2016
  1384 0000DD7D 803D[478E0100]00    <1> 	cmp	byte [SWP_inv_fname], 0
  1385 0000DD84 776C                <1> 	ja	short  syscreat_inv_fname ; invalid file name !
  1386                              <1> 
  1387                              <1> 	; Here, we have a valid path and also a valid file name
  1388                              <1> 	; (Working dir has been changed if the path
  1389                              <1> 	;  -file name string- had contained a dir name.)
  1390                              <1> 
  1391 0000DD86 6631C0              <1> 	xor	ax, ax 
  1392                              <1> 	;mov	esi, FindFile_Name
  1393 0000DD89 E8E3B6FFFF          <1> 	call	find_first_file
  1394 0000DD8E 59                  <1> 	pop	ecx
  1395                              <1> 		; ESI = Directory Entry (FindFile_DirEntry) Location
  1396                              <1> 		; EDI = Directory Buffer Directory Entry Location
  1397                              <1> 		; EAX = File Size
  1398                              <1> 		;  BL = Attributes of The File/Directory
  1399                              <1> 		;  BH = Long Name Yes/No Status (>0 is YES)
  1400                              <1> 		;  DX > 0 : Ambiguous filename chars are used
  1401 0000DD8F 7269                <1> 	jc	short syscreat_1 ; file not found (the good!) 
  1402                              <1> 				 ; or another error (the bad') 
  1403                              <1> 
  1404                              <1> 	; (& the uggly!) truncate file to zero length before open
  1405                              <1> 
  1406                              <1> 	;'*' and '?' already checked at 'set_working_path' stage
  1407                              <1> 	;and	dx, dx
  1408                              <1> 	;jnz	short sysmkdir_err ; permission denied 
  1409                              <1> 				   ; invalid filename chars
  1410                              <1> 
  1411                              <1> 	;test	cl, 10h ; subdirectory ?
  1412                              <1> 	;jnz	short sysmkdir_err	
  1413                              <1> 
  1414                              <1> 	; BL = File Attributes:	
  1415                              <1> 	;     	      bit 0 (1) - Read only file (R)
  1416                              <1> 	;             bit 1 (1) - Hidden file (H)
  1417                              <1>         ;             bit 2 (1) - System file (R)
  1418                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1419                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1420                              <1> 	;	      bit 5 (1) - File has been archived	 	
  1421                              <1> 
  1422                              <1> 	; * existing directory must not be truncated
  1423                              <1> 	;   (we don't know it is empty or not, at this stage) 
  1424                              <1> 	; * existing volume name (or a long name) can not be
  1425                              <1> 	;   re-created or truncated by 'syscreat' 	
  1426                              <1> 	; * A file with S, H, R attributes must not be truncated
  1427                              <1> 	;   (change attributes to normal, if you need truncate it)
  1428                              <1> 
  1429 0000DD91 F6C31F              <1> 	test	bl, 00011111b  ; check attributes of existing file
  1430 0000DD94 754E                <1> 	jnz	short sysmkdir_err
  1431                              <1> 
  1432                              <1> 	;; normal file, OK to continue...
  1433                              <1> 
  1434                              <1> 	; ESI = FindFile_DirEntry
  1435 0000DD96 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI] ; 20
  1436 0000DD9A C1E010              <1> 	shl	eax, 16 ; 13/11/2017
  1437 0000DD9D 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO] ; 26 
  1438                              <1> 	; EAX = First cluster to be truncated/unlinked
  1439 0000DDA1 57                  <1> 	push	edi
  1440 0000DDA2 51                  <1> 	push	ecx
  1441 0000DDA3 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1442 0000DDA8 29C9                <1> 	sub	ecx, ecx
  1443 0000DDAA 8A2D[56820100]      <1> 	mov	ch, [Current_Drv]
  1444 0000DDB0 01CE                <1> 	add	esi, ecx
  1445                              <1> 	; ESI = Logical dos drive description table address
  1446 0000DDB2 E8C9F7FFFF          <1> 	call	truncate_cluster_chain
  1447 0000DDB7 59                  <1> 	pop	ecx
  1448 0000DDB8 5F                  <1> 	pop	edi
  1449 0000DDB9 7230                <1> 	jc	short syscreate_truncate_err
  1450                              <1> 
  1451                              <1> 	; 26/10/2016
  1452                              <1> 	; EDI = Directory entry address in directory buffer
  1453                              <1> 	; Update directory entry
  1454 0000DDBB E848DCFFFF          <1> 	call	convert_current_date_time
  1455                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  1456                              <1>         ; 	    AX = Time in dos dir entry format	
  1457 0000DDC0 66894716            <1> 	mov	[edi+DirEntry_WrtTime], ax
  1458 0000DDC4 66895718            <1> 	mov	[edi+DirEntry_WrtDate], dx	
  1459 0000DDC8 66895712            <1> 	mov	[edi+DirEntry_LastAccDate], dx
  1460 0000DDCC 31C0                <1> 	xor	eax, eax ; file size = 0 
  1461 0000DDCE 89471C              <1> 	mov	[edi+DirEntry_FileSize], eax ; 0
  1462 0000DDD1 C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2 ; data changed sign	
  1463 0000DDD8 BE[488B0100]        <1> 	mov	esi, FindFile_DirEntry
  1464 0000DDDD B201                <1> 	mov	dl, 1 ; open file for writing
  1465 0000DDDF E9AA000000          <1> 	jmp	sysopen_2
  1466                              <1> 
  1467                              <1> sysmkdir_err:
  1468                              <1> 	; 1 = write, 2 = read & write, >2 = invalid
  1469 0000DDE4 B80B000000          <1>         mov	eax, ERR_FILE_ACCESS  ; 11 ; 'permission denied !'
  1470 0000DDE9 EB73                <1>         jmp	short sysopen_err
  1471                              <1> 
  1472                              <1> syscreate_truncate_err:
  1473 0000DDEB B812000000          <1> 	mov	eax, ERR_DRV_WRITE ; 18 ; 'disk write error !'
  1474 0000DDF0 EB6C                <1>         jmp	short sysopen_err
  1475                              <1> 
  1476                              <1> syscreat_inv_fname:  ; invalid file name chars 
  1477                              <1> 	; 16/10/2016
  1478 0000DDF2 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME  ; 26 ; invalid file name chars 
  1479 0000DDF7 59                  <1> 	pop	ecx
  1480 0000DDF8 EB64                <1> 	jmp	sysopen_err
  1481                              <1> 
  1482                              <1> syscreat_1:
  1483                              <1> 	; Error code in EAX
  1484 0000DDFA 3C02                <1>         cmp	al, 02h ; 'File not found' error
  1485 0000DDFC 7560                <1>         jne	sysopen_err
  1486                              <1> 
  1487 0000DDFE F6C110              <1> 	test	cl, 10h ; Directory
  1488 0000DE01 0F852C020000        <1> 	jnz	sysmkdir_2
  1489                              <1> 
  1490                              <1> syscreat_2:
  1491 0000DE07 BE[388B0100]        <1> 	mov	esi, FindFile_Name 
  1492                              <1>         ;xor	edx, edx
  1493 0000DE0C 31C0                <1>         xor	eax, eax ; File Size  = 0
  1494 0000DE0E 31DB                <1> 	xor	ebx, ebx
  1495 0000DE10 4B                  <1> 	dec 	ebx ; FFFFFFFFh -> create empty file 
  1496                              <1> 	            ;              (only for FAT fs) 
  1497                              <1> 	; CL = File Attributes
  1498 0000DE11 E8F8EBFFFF          <1> 	call	create_file
  1499 0000DE16 7246                <1> 	jc	sysopen_err
  1500                              <1> 		; EAX = New file's first cluster
  1501                              <1> 		; ESI = Logical Dos Drv Descr. Table Addr.
  1502                              <1> 		; EBX = offset CreateFile_Size
  1503                              <1> 		; ECX = Sectors per cluster (<256) 
  1504                              <1> 		; EDX = Directory entry index/number (<65536)
  1505                              <1> 	; 26/10/2016
  1506                              <1> 	;mov	esi, Directory_Buffer
  1507                              <1> 	;shl	dx, 5 ; *32
  1508                              <1> 	;add	esi, edx
  1509                              <1> 	;; esi = directory entry address in directory buffer
  1510                              <1> 
  1511                              <1> 	; Here, directory entry has been created but last
  1512                              <1> 	; modification date & time of the parent dir has not
  1513                              <1> 	; been updated, yet! 
  1514                              <1> 	; (Note: Directory and FAT buffers have been updated...)
  1515                              <1>  	
  1516 0000DE18 E824DDFFFF          <1> 	call	update_parent_dir_lmdt ; now, it is OK too!
  1517                              <1> 
  1518                              <1> 	; 25/10/2016
  1519 0000DE1D 66B80018            <1> 	mov	ax, 1800h
  1520 0000DE21 BE[388B0100]        <1> 	mov	esi, FindFile_Name
  1521 0000DE26 E846B6FFFF          <1> 	call	find_first_file
  1522 0000DE2B 7231                <1> 	jc	short sysopen_err
  1523                              <1> 
  1524                              <1> 	; Only possible error after here is 
  1525                              <1> 	; "too many open files !" error.
  1526                              <1> 	;
  1527                              <1> 	; If "syscreat" will return with that error,
  1528                              <1> 	; (the file has been created but it could not be opened)
  1529                              <1> 	; the user must retry to open this file again
  1530                              <1> 	; or must close another file before using 
  1531                              <1> 	; "sysopen" system call.
  1532                              <1> 
  1533 0000DE2D B201                <1> 	mov	dl, 1 ; open file for writing
  1534                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
  1535                              <1> 	; EAX = File Size (= 0)
  1536 0000DE2F EB5D                <1> 	jmp	short sysopen_2
  1537                              <1> 
  1538                              <1> sysopen: ;<open file>
  1539                              <1> 	; 26/10/2016
  1540                              <1> 	; 24/10/2016
  1541                              <1> 	; 17/10/2016
  1542                              <1> 	; 15/10/2016
  1543                              <1> 	; 06/10/2016, 07/10/2016, 08/10/2016
  1544                              <1> 	; 05/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1545                              <1> 	;	     -derived from INT_21H.ASM-
  1546                              <1> 	;            ("loc_INT21h_open_file")
  1547                              <1>         ; 	26/02/2011 
  1548                              <1>         ;	INT 21h Function AH = 3Dh
  1549                              <1>         ;	Open File
  1550                              <1>         ;	INPUT
  1551                              <1>         ;	   AL= File Access Value
  1552                              <1> 	;     	     0- Open for reading
  1553                              <1> 	;            1- Open for writing
  1554                              <1>         ;            2- Open for reading and writing
  1555                              <1>         ;          DS:DX= Pointer to filename (ASCIIZ)
  1556                              <1>         ;
  1557                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1558                              <1> 	; 22/05/2013 - 27/05/2013 (Retro UNIX 8086 v1)
  1559                              <1> 	;
  1560                              <1> 	; 'sysopen' opens a file in following manner:
  1561                              <1> 	;    1) The second argument in a sysopen says whether to
  1562                              <1> 	;	open the file ro read (0) or write (>0).
  1563                              <1> 	;    2) I-node of the particular file is obtained via 'namei'.
  1564                              <1> 	;    3) The file is opened by 'iopen'.
  1565                              <1> 	;    4) Next housekeeping is performed on the fsp table
  1566                              <1> 	;	and the user's open file list - u.fp.
  1567                              <1> 	;	a) u.fp and fsp are scanned for the next available slot.
  1568                              <1> 	;	b) An entry for the file is created in the fsp table.
  1569                              <1> 	;	c) The number of this entry is put on u.fp list.
  1570                              <1> 	;	d) The file descriptor index to u.fp list is pointed
  1571                              <1> 	;	   to by u.r0.
  1572                              <1> 	;
  1573                              <1> 	; Calling sequence:
  1574                              <1> 	;	sysopen; name; mode
  1575                              <1> 	; Arguments:
  1576                              <1> 	;	name - file name or path name
  1577                              <1> 	;	mode - 0 to open for reading
  1578                              <1> 	;	       1 to open for writing
  1579                              <1> 	; Inputs: (arguments)
  1580                              <1> 	; Outputs: *u.r0 - index to u.fp list (the file descriptor)
  1581                              <1> 	;		  is put into r0's location on the stack.	
  1582                              <1> 	; ...............................................................
  1583                              <1> 	;				
  1584                              <1> 	; Retro UNIX 8086 v1 modification: 
  1585                              <1> 	;       'sysopen' system call has two arguments; so,
  1586                              <1> 	;	* 1st argument, name is pointed to by BX register
  1587                              <1> 	;	* 2nd argument, mode is in CX register
  1588                              <1> 	;
  1589                              <1> 	;	AX register (will be restored via 'u.r0') will return
  1590                              <1> 	;	to the user with the file descriptor/number 
  1591                              <1> 	;	(index to u.fp list).
  1592                              <1> 	;
  1593                              <1> 	;call	arg2
  1594                              <1> 	; * name - 'u.namep' points to address of file/path name
  1595                              <1> 	;          in the user's program segment ('u.segmnt')
  1596                              <1> 	;          with offset in BX register (as sysopen argument 1).
  1597                              <1> 	; * mode - sysopen argument 2 is in CX register 
  1598                              <1> 	;          which is on top of stack.
  1599                              <1> 	;
  1600                              <1> 	; jsr r0,arg2 / get sys args into u.namep and on stack
  1601                              <1> 	;
  1602                              <1>        	; system call registers: ebx, ecx (through 'sysenter')
  1603                              <1> 	;
  1604                              <1> 	; TRDOS 386 (05/10/2016)
  1605                              <1> 	;	
  1606                              <1>         ; INPUT ->
  1607                              <1>         ;	   CL = File Access Value (Open Mode)
  1608                              <1> 	;     	      0 - Open file for reading
  1609                              <1> 	;             1 - Open file for writing
  1610                              <1>         ;             2 - Open device for reading
  1611                              <1> 	;	      3 - Open device for writing
  1612                              <1>         ;          EBX = Pointer to filename/devicename (ASCIIZ)
  1613                              <1> 	; OUTPUT ->
  1614                              <1> 	;          eax = File/Device Handle/Number (index) (AL)
  1615                              <1> 	;          cf = 1 -> Error code in AL
  1616                              <1> 	;
  1617                              <1> 	; Modified Registers: EAX (at the return of system call)
  1618                              <1> 	;  
  1619                              <1> 
  1620 0000DE31 80F901              <1> 	cmp	cl, 1 ; read file (0), write file (1)
  1621 0000DE34 7614                <1> 	jna	short sysopen_0
  1622                              <1> 
  1623 0000DE36 80F903              <1> 	cmp	cl, 3
  1624 0000DE39 0F8640010000        <1> 	jna	sysopen_device
  1625                              <1> 
  1626                              <1> 	; Invalid access code
  1627 0000DE3F B817000000          <1> 	mov	eax, ERR_INV_PARAMETER
  1628 0000DE44 0F874B010000        <1> 	ja	sysopen_dev_err
  1629                              <1> 
  1630                              <1> sysopen_0:
  1631                              <1> 	;mov	[u.namep], ebx
  1632 0000DE4A 51                  <1> 	push	ecx
  1633 0000DE4B 89DE                <1> 	mov	esi, ebx
  1634                              <1> 	; file name is forced, change directory as temporary
  1635                              <1> 	;mov	ax, 1
  1636                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
  1637                              <1> 	;call	set_working_path 
  1638 0000DE4D E8EE480000          <1> 	call	set_working_path_x ; 17/10/2016	
  1639 0000DE52 731E                <1> 	jnc	short sysopen_1
  1640                              <1> 
  1641                              <1> syscreat_err: ; ecx = file attributes (for 'syscreat')
  1642 0000DE54 59                  <1> 	pop	ecx ; open mode  
  1643 0000DE55 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  1644 0000DE57 7505                <1> 	jnz	short sysopen_err
  1645                              <1> 	; eax = 0
  1646 0000DE59 B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
  1647                              <1> sysopen_err:
  1648 0000DE5E A3[64030300]        <1> 	mov	[u.r0], eax
  1649 0000DE63 A3[C8030300]        <1> 	mov	[u.error], eax
  1650 0000DE68 E8A8490000          <1> 	call 	reset_working_path
  1651 0000DE6D E95AFAFFFF          <1> 	jmp	error
  1652                              <1> 
  1653                              <1> sysopen_1:
  1654                              <1> 	;mov	esi, FindFile_Name
  1655 0000DE72 66B80018            <1>         mov	ax, 1800h ; Only files 
  1656 0000DE76 E8F6B5FFFF          <1> 	call	find_first_file
  1657 0000DE7B 5A                  <1> 	pop	edx
  1658 0000DE7C 72E0                <1> 	jc	short sysopen_err ; eax = 2 (File not found !)
  1659                              <1> 
  1660                              <1> 	; check_open_file_attr_access_code
  1661                              <1> 
  1662 0000DE7E F6C307              <1>         test	bl, 7  ; system, hidden, readonly 
  1663 0000DE81 740B                <1>         jz	short sysopen_2
  1664                              <1> 
  1665 0000DE83 20D2                <1> 	and	dl, dl ; 0 = read mode
  1666 0000DE85 7407                <1> 	jz	short sysopen_2
  1667                              <1> 
  1668                              <1> 	; 1 = write, 2 = read & write, >2 = invalid
  1669 0000DE87 B80B000000          <1>         mov	eax, ERR_FILE_ACCESS  ; 11 = 'permission denied !'
  1670 0000DE8C EBD0                <1>         jmp	short sysopen_err
  1671                              <1> 
  1672                              <1> sysopen_2:
  1673                              <1> 	; esi = Directory Entry (FindFile_DirEntry) Location
  1674 0000DE8E 89F3                <1> 	mov	ebx, esi
  1675 0000DE90 31F6                <1>         xor     esi, esi ; 0
  1676 0000DE92 31FF                <1>         xor     edi, edi ; 0
  1677                              <1> sysopen_3: ; scan the list of entries in fsp table
  1678 0000DE94 80BE[6A030300]00    <1>         cmp     byte [esi+u.fp], 0
  1679 0000DE9B 760F                <1>         jna     short sysopen_4 ; empty slot
  1680 0000DE9D 6646                <1>         inc     si
  1681 0000DE9F 6683FE0A            <1>         cmp     si, 10
  1682 0000DEA3 72EF                <1> 	jb	short sysopen_3
  1683                              <1> toomanyf:
  1684 0000DEA5 B80D000000          <1> 	mov	eax, ERR_TOO_MANY_FILES ; too many open files !
  1685 0000DEAA EBB2                <1> 	jmp	short sysopen_err
  1686                              <1> 
  1687                              <1> sysopen_4: 
  1688 0000DEAC 80BF[B6910100]00    <1>         cmp     byte [edi+OF_MODE], 0 ; Scan open files table 
  1689 0000DEB3 760A                <1> 	jna     short sysopen_5
  1690 0000DEB5 6647                <1> 	inc	di
  1691 0000DEB7 6683FF0A            <1> 	cmp     di, OPENFILES ; max. number of open files (=10)
  1692 0000DEBB 72EF                <1> 	jb	short sysopen_4
  1693 0000DEBD EBE6                <1> 	jmp	short toomanyf
  1694                              <1> 
  1695                              <1> sysopen_5:
  1696 0000DEBF FEC2                <1> 	inc	dl
  1697 0000DEC1 8897[B6910100]      <1>         mov     [edi+OF_MODE], dl
  1698 0000DEC7 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
  1699 0000DECD 8897[AC910100]      <1>         mov     [edi+OF_DRIVE], dl ; Logical DOS drive number
  1700 0000DED3 66C1E702            <1> 	shl	di, 2 ; *4 (dword offset)
  1701                              <1> 
  1702 0000DED7 8987[FC910100]      <1> 	mov	[edi+OF_SIZE], eax ; File size in bytes
  1703                              <1> 
  1704 0000DEDD 668B4314            <1>         mov 	ax, [ebx+DirEntry_FstClusHI]
  1705 0000DEE1 C1E010              <1> 	shl	eax, 16
  1706 0000DEE4 668B431A            <1> 	mov 	ax, [ebx+DirEntry_FstClusLO]
  1707 0000DEE8 8987[84910100]      <1> 	mov     [edi+OF_FCLUSTER], eax ; First cluster
  1708 0000DEEE 8987[9C920100]      <1> 	mov     [edi+OF_CCLUSTER], eax ; Current cluster
  1709                              <1> 
  1710 0000DEF4 31DB                <1>         xor	ebx, ebx
  1711 0000DEF6 899F[D4910100]      <1>         mov     [edi+OF_POINTER], ebx ; offset pointer (0)
  1712 0000DEFC 899F[C4920100]      <1>         mov     [edi+OF_CCINDEX], ebx ; cluster index (0)
  1713                              <1> 
  1714 0000DF02 A1[688B0100]        <1> 	mov	eax, [FindFile_DirFirstCluster]
  1715 0000DF07 8987[24920100]      <1> 	mov	[edi+OF_DIRFCLUSTER], eax
  1716                              <1> 
  1717 0000DF0D A1[6C8B0100]        <1> 	mov	eax, [FindFile_DirCluster]
  1718 0000DF12 8987[4C920100]      <1> 	mov	[edi+OF_DIRCLUSTER], eax
  1719                              <1> 
  1720                              <1> 	; Get (& Save) Volume ID 
  1721                              <1> 	; Important for files of removable drives
  1722                              <1> 	; (In order to check the drive has same volume/disk)
  1723 0000DF18 88D7                <1> 	mov	bh, dl
  1724 0000DF1A 81C300010900        <1>         add	ebx, Logical_DOSDisks
  1725 0000DF20 8A4303              <1>         mov	al, [ebx+LD_FATType]
  1726 0000DF23 3C01                <1>         cmp	al, 1
  1727 0000DF25 7209                <1>         jb	short sysopen_6_fs
  1728 0000DF27 3C02                <1>         cmp	al, 2
  1729 0000DF29 770A                <1>         ja	short sysopen_6_fat32
  1730                              <1> sysopen_6_fat:
  1731 0000DF2B 8B432D              <1>         mov	eax, [ebx+LD_BPB+VolumeID]
  1732 0000DF2E EB08                <1>         jmp	short sysopen_7
  1733                              <1> sysopen_6_fs:
  1734 0000DF30 8B4328              <1>         mov	eax, [ebx+LD_FS_VolumeSerial]
  1735 0000DF33 EB03                <1>         jmp	short sysopen_7
  1736                              <1> sysopen_6_fat32:
  1737 0000DF35 8B4349              <1>         mov	eax, [ebx+LD_BPB+FAT32_VolID]
  1738                              <1> sysopen_7:
  1739 0000DF38 A3[4C820100]        <1>         mov	[Current_VolSerial], eax
  1740                              <1> 
  1741 0000DF3D 8987[74920100]      <1> 	mov	[edi+OF_VOLUMEID], eax
  1742                              <1> 
  1743                              <1> 	; 24/10/2016
  1744 0000DF43 66D1EF              <1> 	shr	di, 1 ; 4/2, word offset
  1745 0000DF46 668B1D[708B0100]    <1> 	mov	bx, [FindFile_DirEntryNumber]
  1746 0000DF4D 66899F[EC920100]    <1> 	mov	[edi+OF_DIRENTRY], bx
  1747                              <1> 
  1748 0000DF54 31D2                <1> 	xor	edx, edx
  1749                              <1> 	;shr	di, 2 ; /4 (byte offset)
  1750 0000DF56 66D1EF              <1> 	shr	di, 1 ; 2/2, byte offset
  1751 0000DF59 8897[CA910100]      <1> 	mov	byte [edi+OF_OPENCOUNT], dl ; 0
  1752 0000DF5F 8897[C0910100]      <1> 	mov	byte [edi+OF_STATUS], dl ; 0
  1753                              <1> 
  1754 0000DF65 89FB                <1> 	mov	ebx, edi
  1755 0000DF67 FEC3                <1> 	inc	bl
  1756                              <1> 
  1757 0000DF69 889E[6A030300]      <1>         mov     [esi+u.fp], bl ; Open File Entry Number
  1758 0000DF6F 8935[64030300]      <1> 	mov     [u.r0], esi ; move index to u.fp list 
  1759                              <1> 			    ; into eax on stack
  1760                              <1> 
  1761 0000DF75 E89B480000          <1>         call 	reset_working_path
  1762                              <1>         
  1763 0000DF7A E96DF9FFFF          <1> 	jmp	sysret
  1764                              <1> 
  1765                              <1> 	; (Retro UNIX 386 v1.0)
  1766                              <1> 	; 'fsp' table (10 bytes/entry)
  1767                              <1> 	; bit 15				   bit 0
  1768                              <1> 	; ---|-------------------------------------------
  1769                              <1> 	; r/w|		i-number of open file
  1770                              <1> 	; ---|-------------------------------------------
  1771                              <1> 	;		   device number
  1772                              <1> 	; -----------------------------------------------
  1773                              <1> 	; offset pointer, r/w pointer to file (bit 0-15)
  1774                              <1> 	; -----------------------------------------------
  1775                              <1> 	; offset pointer, r/w pointer to file (bit 16-31)
  1776                              <1> 	; ----------------------|------------------------
  1777                              <1> 	;  flag that says file 	| number of processes
  1778                              <1> 	;   has been deleted	| that have file open 
  1779                              <1> 	; ----------------------|------------------------
  1780                              <1> 
  1781                              <1> sysopen_device:
  1782                              <1> 	; 15/10/2016
  1783                              <1> 	; 08/10/2016
  1784                              <1> 	; 07/10/2016 (TRDOS 386 = TRDOS v2.0)
  1785 0000DF7F 51                  <1> 	push	ecx ; open mode
  1786 0000DF80 89E5                <1> 	mov	ebp, esp
  1787 0000DF82 B910000000          <1> 	mov	ecx, 16 ; transfer length = 16 bytes 
  1788 0000DF87 29CC                <1> 	sub	esp, ecx
  1789 0000DF89 89E7                <1> 	mov	edi, esp ; destination address 
  1790 0000DF8B 89DE                <1> 	mov 	esi, ebx ; dev name in user's memory space
  1791 0000DF8D E87C330000          <1> 	call	transfer_from_user_buffer
  1792 0000DF92 7310                <1> 	jnc	short sysopen_dev_0
  1793                              <1> 	; eax = ERR_OUT_OF_MEMORY = 4 = ERR_MINOR_IM
  1794 0000DF94 59                  <1> 	pop	ecx
  1795                              <1> sysopen_dev_err:
  1796 0000DF95 A3[64030300]        <1> 	mov	[u.r0], eax
  1797 0000DF9A A3[C8030300]        <1> 	mov	[u.error], eax
  1798 0000DF9F E928F9FFFF          <1> 	jmp	error
  1799                              <1> sysopen_dev_0:
  1800 0000DFA4 89FE                <1> 	mov	esi, edi ; Device name addr (max. 16 bytes, ASCIIZ) 
  1801                              <1> 			 ; for example: "tty, TTY, /dev/tty"
  1802 0000DFA6 E8104B0000          <1> 	call	get_device_number
  1803 0000DFAB 89EC                <1> 	mov	esp, ebp
  1804 0000DFAD 59                  <1> 	pop	ecx
  1805 0000DFAE 7307                <1> 	jnc	short sysopen_dev_1
  1806 0000DFB0 B818000000          <1> 	mov	eax, ERR_INV_DEV_NAME ; 24 ; 'invalid device name !'
  1807 0000DFB5 EBDE                <1> 	jmp	short sysopen_dev_err
  1808                              <1> sysopen_dev_1:
  1809                              <1> 	; eax = Device Number (AL)
  1810                              <1> 	;  cl = Open mode (2 = device read, 3 = device write)
  1811 0000DFB7 31DB                <1>         xor     ebx, ebx ; 0
  1812                              <1> sysopen_dev_2: ; scan the list of entries
  1813 0000DFB9 389B[6A030300]      <1>         cmp     [ebx+u.fp], bl ; 0
  1814 0000DFBF 760E                <1>         jna     short sysopen_dev_3 ; empty slot
  1815 0000DFC1 FEC3                <1>         inc     bl
  1816 0000DFC3 80FB0A              <1>         cmp     bl, 10
  1817 0000DFC6 72F1                <1> 	jb	short sysopen_dev_2
  1818                              <1> 	;
  1819 0000DFC8 B80D000000          <1> 	mov	eax, ERR_TOO_MANY_FILES ; too many open files !
  1820 0000DFCD EBC6                <1> 	jmp	short sysopen_dev_err
  1821                              <1> sysopen_dev_3:
  1822 0000DFCF 891D[64030300]      <1> 	mov 	[u.r0], ebx ; File/Device index/handle/descriptor
  1823                              <1> 	; eax = device number (entry offset)
  1824 0000DFD5 8AA8[488F0100]      <1> 	mov	ch, [eax+DEV_ACCESS] ; bit 0 = accessable by users
  1825                              <1> 				     ; bit 1 = read access perm
  1826                              <1> 				     ; bit 2 = write access perm
  1827                              <1> 				     ; bit 3 = IOCTL permit to users
  1828                              <1> 				     ; bit 4 = block device if set
  1829                              <1> 				     ; bit 5 = 16 bit or 1024 byte
  1830                              <1> 				     ; bit 6 = 32 bit or 2048 byte
  1831                              <1> 				     ; bit 7 = installable device drv
  1832 0000DFDB F6C501              <1> 	test 	ch, 1 ; accessable by normal users (except root)
  1833 0000DFDE 7510                <1> 	jnz	short sysopen_dev_4 ; yes, permission has been given
  1834 0000DFE0 803D[B0030300]00    <1> 	cmp	byte [u.uid], 0 ; root?
  1835 0000DFE7 7607                <1> 	jna	short sysopen_dev_4 ; superuser can open all devices
  1836                              <1> sysopen_dev_perm_err:
  1837 0000DFE9 B80B000000          <1> 	mov	eax, ERR_DEV_ACCESS  ; 11 = 'permission denied !'
  1838 0000DFEE EBA5                <1> 	jmp	short sysopen_dev_err
  1839                              <1> sysopen_dev_4:
  1840 0000DFF0 D0ED                <1> 	shr	ch, 1 ; result: 1 = read, 2 = write, 3 = r & w 
  1841 0000DFF2 FEC9                <1> 	dec	cl  ; result: 1 = read, 2 = write
  1842 0000DFF4 84E9                <1> 	test	cl, ch
  1843 0000DFF6 74F1                <1> 	jz	short sysopen_dev_perm_err 
  1844                              <1> 
  1845 0000DFF8 D0E5                <1> 	shl	ch, 1 ; bit 0 = 0
  1846                              <1> 	; eax = device number (entry offset)
  1847 0000DFFA E8D84B0000          <1> 	call	device_open
  1848 0000DFFF 72E8                <1> 	jc	short sysopen_dev_perm_err 
  1849                              <1> 
  1850                              <1> 	; eax = device number (entry offset)
  1851 0000E001 0C80                <1> 	or	al, 80h ; set device bit (set bit 7 to 1)
  1852 0000E003 8B1D[64030300]      <1> 	mov	ebx, [u.r0]
  1853 0000E009 8883[6A030300]      <1> 	mov	[ebx+u.fp], al	; bit 7 (=1) points to device	
  1854                              <1> 	
  1855 0000E00F E9D8F8FFFF          <1> 	jmp	sysret
  1856                              <1> 
  1857                              <1> sysmkdir: ; < make directory >
  1858                              <1> 	; 15/10/2016
  1859                              <1> 	; 10/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1860                              <1> 	;	     -derived from INT_21H.ASM-
  1861                              <1> 	;            ("loc_INT21h_create_file")
  1862                              <1>         ; 	10/07/2011 (12/03/2011)
  1863                              <1>         ;	INT 21h Function AH = 3Ch
  1864                              <1>         ;	Create File
  1865                              <1>         ;	INPUT
  1866                              <1>         ;	   CX = Attributes
  1867                              <1>         ;          DS:DX= Address of zero terminaned path name
  1868                              <1>         ;
  1869                              <1>         ;
  1870                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1871                              <1> 	; 27/05/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  1872                              <1> 	;
  1873                              <1> 	; 'sysmkdir' creates an empty directory whose name is
  1874                              <1> 	; pointed to by arg 1. The mode of the directory is arg 2.	
  1875                              <1> 	; The special entries '.' and '..' are not present.
  1876                              <1> 	; Errors are indicated if the directory already exists or		
  1877                              <1> 	; user is not the super user. 
  1878                              <1> 	;
  1879                              <1> 	; Calling sequence:
  1880                              <1> 	;	sysmkdir; name; mode
  1881                              <1> 	; Arguments:
  1882                              <1> 	;	name - points to the name of the directory
  1883                              <1> 	;	mode - mode of the directory
  1884                              <1> 	; Inputs: (arguments)
  1885                              <1> 	; Outputs: -
  1886                              <1> 	;    (sets 'directory' flag to 1; 
  1887                              <1> 	;    'set user id on execution' and 'executable' flags to 0)
  1888                              <1> 	; ...............................................................
  1889                              <1> 	;				
  1890                              <1> 	; Retro UNIX 8086 v1 modification: 
  1891                              <1> 	;       'sysmkdir' system call has two arguments; so,
  1892                              <1> 	;	* 1st argument, name is pointed to by BX register
  1893                              <1> 	;	* 2nd argument, mode is in CX register
  1894                              <1> 	;
  1895                              <1> 	; TRDOS 386 (10/10/2016)
  1896                              <1> 	;	
  1897                              <1>         ; INPUT ->
  1898                              <1>         ;	   CL = Directory Attributes
  1899                              <1> 	;     	      bit 0 (1) - Read only file/dir (R)
  1900                              <1> 	;             bit 1 (1) - Hidden file/dir (H)
  1901                              <1>         ;             bit 2 (1) - System file/dir (R)
  1902                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1903                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1904                              <1> 	;	      bit 5 (1) - File/Dir has been archived (A)
  1905                              <1> 	;	   CX = 0 -> create normal directory	 	
  1906                              <1>         ;          EBX = Pointer to directory name (ASCIIZ) -path-
  1907                              <1> 	;	
  1908                              <1> 	; OUTPUT ->
  1909                              <1> 	;          eax = First cluster of the new directory
  1910                              <1> 	;          cf = 1 -> Error code in AL
  1911                              <1> 	;
  1912                              <1> 	; Modified Registers: EAX (at the return of system call)
  1913                              <1> 	;  
  1914                              <1> 	; Note: If the file or directory is existing
  1915                              <1> 	;	an access error will be returned. 
  1916                              <1> 
  1917 0000E014 6621C9              <1> 	and	cx, cx ; if cx = 0 -> create a normal subdir
  1918 0000E017 7413                <1> 	jz	short sysmkdir_1
  1919                              <1> 
  1920 0000E019 F6C110              <1> 	test	cl, 10h ; if dir flags set, also use other flags
  1921 0000E01C 0F853EFDFFFF        <1> 	jnz	sysmkdir_0 ; jump to head of 'syscreat'
  1922                              <1> 
  1923                              <1> 	; CX has wrong flags
  1924 0000E022 B817000000          <1> 	mov 	eax, ERR_INV_FLAGS
  1925 0000E027 E969FFFFFF          <1> 	jmp	sysopen_dev_err
  1926                              <1> 
  1927                              <1> sysmkdir_1:
  1928 0000E02C B110                <1> 	mov	cl, 10h ; set subdir flag and reset other flags
  1929 0000E02E E92DFDFFFF          <1> 	jmp	sysmkdir_0 ; jump to head of 'syscreat'
  1930                              <1> sysmkdir_2: 
  1931                              <1> 	; jump from 'syscreat' ; from 'syscreat_1'
  1932                              <1> 	;  CL = Directory attributes/flags  
  1933 0000E033 BE[388B0100]        <1> 	mov	esi, FindFile_Name 
  1934 0000E038 E804D7FFFF          <1> 	call	make_sub_directory
  1935 0000E03D 0F821BFEFFFF        <1> 	jc	sysopen_err       ; NOTE: Old type (TRDOS 8086)
  1936                              <1> 				  ; error codes must be modified
  1937                              <1> 				  ; for next TRDOS 386 versions
  1938                              <1> 				  ; (10/10/2016)
  1939                              <1> 				  ; Old (MSDOS type)
  1940                              <1> 				  ; error codes (2011):
  1941                              <1> 				  ;  2 = file not found
  1942                              <1> 				  ;  3 = directory not found
  1943                              <1> 				  ;  5 = access denied
  1944                              <1> 				  ; 12 = no more files
  1945                              <1> 			          ; 19 = disk write protected   
  1946                              <1> 				  ; 39 = insufficient disk space
  1947                              <1> 				  ; 'sysdefs.s' ; 10/10/2016  	
  1948                              <1> 	
  1949 0000E043 A3[64030300]        <1> 	mov	[u.r0], eax ; New sub dir's first cluster
  1950                              <1> 
  1951 0000E048 E8C8470000          <1>         call 	reset_working_path
  1952                              <1> 
  1953 0000E04D E99AF8FFFF          <1> 	jmp	sysret	
  1954                              <1> 
  1955                              <1> sysclose: ;<close file>
  1956                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1957                              <1> 	;
  1958                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1959                              <1> 	; 22/05/2013 - 26/05/2013 (Retro UNIX 8086 v1)
  1960                              <1> 	;
  1961                              <1> 	; 'sysclose', given a file descriptor in 'u.r0', closes the
  1962                              <1> 	; associated file. The file descriptor (index to 'u.fp' list)
  1963                              <1> 	; is put in r1 and 'fclose' is called.
  1964                              <1> 	;
  1965                              <1> 	; Calling sequence:
  1966                              <1> 	;	sysclose
  1967                              <1> 	; Arguments:
  1968                              <1> 	;	-  
  1969                              <1> 	; Inputs: *u.r0 - file descriptor
  1970                              <1> 	; Outputs: -
  1971                              <1> 	; ...............................................................
  1972                              <1> 	;				
  1973                              <1> 	; Retro UNIX 8086 v1 modification:
  1974                              <1> 	;	 The user/application program puts file descriptor
  1975                              <1> 	;        in BX register as 'sysclose' system call argument.
  1976                              <1> 	; 	 (argument transfer method 1)
  1977                              <1> 
  1978                              <1> 	; TRDOS 386 (06/10/2016)
  1979                              <1> 	;	
  1980                              <1>         ; INPUT ->
  1981                              <1>         ;	   EBX = File Handle/Number (file index) (AL)
  1982                              <1> 	; OUTPUT ->
  1983                              <1> 	;          cf = 0 -> EAX = 0
  1984                              <1> 	;          cf = 1 -> Error code in EAX (ERR_FILE_NOT_OPEN)
  1985                              <1> 	;
  1986                              <1> 	; Modified Registers: EAX (at the return of system call)
  1987                              <1> 	;  
  1988                              <1> 
  1989 0000E052 89D8                <1> 	mov 	eax, ebx
  1990 0000E054 31DB                <1> 	xor	ebx, ebx	
  1991 0000E056 891D[64030300]      <1> 	mov	[u.r0], ebx ; 0  ; return value of EAX
  1992 0000E05C E83C270000          <1> 	call 	fclose
  1993 0000E061 0F8385F8FFFF        <1> 	jnc	sysret
  1994 0000E067 B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN ; file not open !
  1995 0000E06C A3[C8030300]        <1> 	mov	[u.error], eax ;
  1996 0000E071 A3[64030300]        <1> 	mov	[u.r0], eax ; ! invalid handle !
  1997 0000E076 E951F8FFFF          <1> 	jmp	error
  1998                              <1> 
  1999                              <1> sysread: ; < read from file >
  2000                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  2001                              <1> 	;	     -derived from INT_21H.ASM-
  2002                              <1> 	;            ("loc_INT21h_read_file")
  2003                              <1>         ; 	13/03/2011 (05/03/2011)
  2004                              <1>         ;	INT 21h Function AH = 3Fh
  2005                              <1>         ;	Read from a File
  2006                              <1>         ;	INPUT
  2007                              <1> 	;	   BX = File Handle
  2008                              <1>         ;	   CX = Number of bytes to read
  2009                              <1>         ;          DS:DX= Buffer address
  2010                              <1>         ;
  2011                              <1> 	; Note: TRDOS 386 'sysread' has been derived from 
  2012                              <1> 	;	Retro UNIX 386 v1 'sysread', except a few 
  2013                              <1> 	;	code modifications.
  2014                              <1> 	;
  2015                              <1> 	; 13/05/2015 (Retro UNIX 386 v1)
  2016                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  2017                              <1> 	; 23/05/2013 (Retro UNIX 8086 v1)
  2018                              <1> 	;
  2019                              <1> 	; 'sysread' is given a buffer to read into and the number of
  2020                              <1> 	; characters to be read. If finds the file from the file
  2021                              <1> 	; descriptor located in *u.r0 (r0). This file descriptor
  2022                              <1> 	; is returned from a successful open call (sysopen).
  2023                              <1> 	; The i-number of file is obtained via 'rw1' and the data
  2024                              <1> 	; is read into core via 'readi'.
  2025                              <1> 	;
  2026                              <1> 	; Calling sequence:
  2027                              <1> 	;	sysread; buffer; nchars
  2028                              <1> 	; Arguments:
  2029                              <1> 	;	buffer - location of contiguous bytes where 
  2030                              <1> 	;		 input will be placed.
  2031                              <1> 	;	nchars - number of bytes or characters to be read.
  2032                              <1> 	; Inputs: *u.r0 - file descriptor (& arguments)
  2033                              <1> 	; Outputs: *u.r0 - number of bytes read.	
  2034                              <1> 	; ...............................................................
  2035                              <1> 	;				
  2036                              <1> 	; Retro UNIX 8086 v1 modification: 
  2037                              <1> 	;       'sysread' system call has three arguments; so,
  2038                              <1> 	;	* 1st argument, file descriptor is in BX register
  2039                              <1> 	;	* 2nd argument, buffer address/offset in CX register
  2040                              <1> 	;	* 3rd argument, number of bytes is in DX register
  2041                              <1> 	;
  2042                              <1> 	;	AX register (will be restored via 'u.r0') will return
  2043                              <1> 	;	to the user with number of bytes read. 
  2044                              <1> 	;
  2045                              <1> 	; TRDOS 386 (05/10/2016)
  2046                              <1> 	;	
  2047                              <1>         ; INPUT ->
  2048                              <1>         ;	   EBX = File handle (descriptor/index)
  2049                              <1> 	;	   ECX = Buffer address		
  2050                              <1>         ;          EDX = Number of bytes
  2051                              <1> 	; OUTPUT ->
  2052                              <1> 	;          EAX = Number of bytes have been read
  2053                              <1> 	;          cf = 1 -> Error code in AL
  2054                              <1> 	;
  2055                              <1> 	; Modified Registers: EAX (at the return of system call)
  2056                              <1> 	; 
  2057                              <1> 
  2058                              <1> 	; EBX = File descriptor
  2059 0000E07B E86B270000          <1> 	call	getf1 
  2060 0000E080 7277                <1> 	jc	short device_read ; read data from device
  2061                              <1> 	; EAX = First cluster of the file
  2062                              <1> 
  2063 0000E082 E83F000000          <1> 	call	rw1
  2064 0000E087 730A                <1> 	jnc	short sysread_0
  2065                              <1> 
  2066 0000E089 A3[64030300]        <1> 	mov	[u.r0], eax ; error code
  2067 0000E08E E939F8FFFF          <1> 	jmp	error
  2068                              <1> 	 
  2069                              <1> sysread_0:
  2070 0000E093 E8622D0000          <1> 	call	readi
  2071 0000E098 EB1D                <1> 	jmp	short rw0
  2072                              <1> 
  2073                              <1> syswrite: ; < write to file >
  2074                              <1> 	; 23/10/2016
  2075                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  2076                              <1> 	;	     -derived from INT_21H.ASM-
  2077                              <1> 	;            ("loc_INT21h_write_file")
  2078                              <1>         ; 	13/03/2011 (05/03/2011)
  2079                              <1>         ;	INT 21h Function AH = 40h
  2080                              <1>         ;	Write to a File
  2081                              <1>         ;	INPUT
  2082                              <1> 	;	   BX = File Handle
  2083                              <1>         ;	   CX = Number of bytes to write
  2084                              <1>         ;          DS:DX= Buffer address
  2085                              <1>         ;
  2086                              <1> 	; Note: TRDOS 386 'sysrwrite' has been derived from 
  2087                              <1> 	;	Retro UNIX 386 v1 'syswrite', except a few 
  2088                              <1> 	;	code modifications.
  2089                              <1> 	;
  2090                              <1> 
  2091                              <1> 	; 13/05/2015 (Retro UNIX 386 v1)
  2092                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  2093                              <1> 	; 23/05/2013 (Retro UNIX 8086 v1)
  2094                              <1> 	;
  2095                              <1> 	; 'syswrite' is given a buffer to write onto an output file
  2096                              <1> 	; and the number of characters to write. If finds the file
  2097                              <1> 	; from the file descriptor located in *u.r0 (r0). This file 
  2098                              <1> 	; descriptor is returned from a successful open or create call
  2099                              <1> 	; (sysopen or syscreat). The i-number of file is obtained via
  2100                              <1> 	; 'rw1' and buffer is written on the output file via 'write'.
  2101                              <1> 	;
  2102                              <1> 	; Calling sequence:
  2103                              <1> 	;	syswrite; buffer; nchars
  2104                              <1> 	; Arguments:
  2105                              <1> 	;	buffer - location of contiguous bytes to be writtten.
  2106                              <1> 	;	nchars - number of characters to be written.
  2107                              <1> 	; Inputs: *u.r0 - file descriptor (& arguments)
  2108                              <1> 	; Outputs: *u.r0 - number of bytes written.	
  2109                              <1> 	; ...............................................................
  2110                              <1> 	;				
  2111                              <1> 	; Retro UNIX 8086 v1 modification: 
  2112                              <1> 	;       'syswrite' system call has three arguments; so,
  2113                              <1> 	;	* 1st argument, file descriptor is in BX register
  2114                              <1> 	;	* 2nd argument, buffer address/offset in CX register
  2115                              <1> 	;	* 3rd argument, number of bytes is in DX register
  2116                              <1> 	;
  2117                              <1> 	;	AX register (will be restored via 'u.r0') will return
  2118                              <1> 	;	to the user with number of bytes written. 
  2119                              <1> 	;
  2120                              <1> 	; INPUT ->
  2121                              <1>         ;	   EBX = File handle (descriptor/index)
  2122                              <1> 	;	   ECX = Buffer address		
  2123                              <1>         ;          EDX = Number of bytes
  2124                              <1> 	; OUTPUT ->
  2125                              <1> 	;          EAX = Number of bytes have been written
  2126                              <1> 	;          cf = 1 -> Error code in AL
  2127                              <1> 	;
  2128                              <1> 	; Modified Registers: EAX (at the return of system call)
  2129                              <1> 	;  
  2130                              <1> 
  2131                              <1> 	; EBX = File descriptor
  2132 0000E09A E84C270000          <1> 	call	getf1 
  2133 0000E09F 7274                <1> 	jc	short device_write ; write data to device
  2134                              <1> 	; EAX = First cluster of the file
  2135                              <1> 	; EBX = File number  (Open file number) ; 23/10/2016
  2136                              <1> 
  2137 0000E0A1 E820000000          <1> 	call	rw1
  2138 0000E0A6 730A                <1> 	jnc	short syswrite_0
  2139 0000E0A8 A3[64030300]        <1> 	mov	[u.r0], eax ; error code
  2140 0000E0AD E91AF8FFFF          <1> 	jmp	error
  2141                              <1> 	 
  2142                              <1> syswrite_0:
  2143 0000E0B2 E86F340000          <1> 	call	writei
  2144                              <1> rw0: ; 1:
  2145 0000E0B7 A1[8C030300]        <1>         mov	eax, [u.nread]
  2146 0000E0BC A3[64030300]        <1> 	mov	[u.r0], eax
  2147 0000E0C1 E926F8FFFF          <1> 	jmp	sysret
  2148                              <1> 
  2149                              <1> rw1:	
  2150                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  2151                              <1> 	; 14/05/2015 (Retro UNIX 386 v1)
  2152                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  2153                              <1> 	; 23/05/2013 - 24/05/2013 (Retro UNIX 8086 v1)
  2154                              <1> 	; System call registers: ebx, ecx, edx (through 'sysenter')
  2155                              <1> 	;
  2156                              <1> 	; EBX = File descriptor
  2157                              <1> 	;call	getf1 ; calling point in 'getf' from 'rw1'
  2158                              <1> 	;jc	short device_rw ; read/write data from/to device
  2159                              <1> 	; EAX = First cluster of the file
  2160                              <1> 
  2161 0000E0C6 83F802              <1> 	cmp 	eax, 2
  2162 0000E0C9 7217                <1> 	jb	short rw2
  2163                              <1> 	;
  2164 0000E0CB 890D[84030300]      <1> 	mov	[u.base], ecx 	; buffer address/offset 
  2165                              <1> 				;(in the user's virtual memory space)
  2166 0000E0D1 8915[88030300]      <1> 	mov	[u.count], edx 
  2167                              <1> 
  2168 0000E0D7 C705[C8030300]0000- <1>         mov     dword [u.error], 0 ; reset the last error code
  2168 0000E0DF 0000                <1>
  2169 0000E0E1 C3                  <1> 	retn
  2170                              <1> 
  2171                              <1> rw2:
  2172 0000E0E2 B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN ; file not open !
  2173 0000E0E7 A3[C8030300]        <1> 	mov	dword [u.error], eax
  2174 0000E0EC C3                  <1> 	retn
  2175                              <1> rw3: 
  2176 0000E0ED B80B000000          <1> 	mov	eax, ERR_FILE_ACCESS ; permission denied !
  2177 0000E0F2 A3[C8030300]        <1> 	mov	dword [u.error], eax
  2178 0000E0F7 F9                  <1> 	stc
  2179 0000E0F8 C3                  <1> 	retn
  2180                              <1> 
  2181                              <1> device_read:
  2182                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0)
  2183                              <1> 	; cl = DEV_OPENMODE ; open mode
  2184                              <1> 	; ch = DEV_ACCESS   ; access flags   
  2185                              <1> 	; al = DEV_DRIVER   ; device number (eax)
  2186                              <1> 
  2187 0000E0F9 F6C101              <1> 	test	cl, 1 ; 1 = read, 2 = write, 3 = read&write
  2188 0000E0FC 74EF                <1> 	jz	short rw3
  2189                              <1> 
  2190 0000E0FE 89C3                <1> 	mov	ebx, eax
  2191 0000E100 66C1E302            <1> 	shl	bx, 2 ; *4
  2192                              <1> 
  2193 0000E104 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  2194 0000E107 7406                <1> 	jz	short d_read_2 ; Kernel device
  2195                              <1> 	; installable device
  2196                              <1> d_read_1:
  2197 0000E109 FFA3[048F0100]      <1>         jmp	dword [ebx+IDEV_RADDR-4]
  2198                              <1> d_read_2:
  2199 0000E10F FFA3[A0400100]      <1> 	jmp	dword [ebx+KDEV_RADDR-4]
  2200                              <1> 
  2201                              <1> device_write:
  2202                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0)
  2203                              <1> 	; cl = DEV_OPENMODE ; open mode
  2204                              <1> 	; ch = DEV_ACCESS   ; access flags   
  2205                              <1> 	; al = DEV_DRIVER   ; device number (eax)
  2206                              <1> 
  2207 0000E115 F6C102              <1> 	test	cl, 2 ; 1 = read, 2 = write, 3 = read&write
  2208 0000E118 74D3                <1> 	jz	short rw3	
  2209                              <1> 
  2210 0000E11A 89C3                <1> 	mov	ebx, eax
  2211 0000E11C 66C1E302            <1> 	shl	bx, 2 ; *4
  2212                              <1> 
  2213 0000E120 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  2214 0000E123 7406                <1> 	jz	short d_write_2 ; Kernel device
  2215                              <1> 	; installable device
  2216                              <1> d_write_1:
  2217 0000E125 FFA3[248F0100]      <1>         jmp	dword [ebx+IDEV_WADDR-4]
  2218                              <1> d_write_2:
  2219 0000E12B FFA3[F0400100]      <1> 	jmp	dword [ebx+KDEV_WADDR-4]
  2220                              <1> 
  2221                              <1> 
  2222                              <1> sysemt: ; enable (or disable) multi tasking -time sharing-
  2223                              <1> 	;
  2224                              <1> 	; 23/05/2016 - TRDOS 386 (TRDOS v2.0)
  2225                              <1> 	; 14/05/2015 (Retro UNIX 386 v1)
  2226                              <1> 	; 10/12/2013 - 20/04/2014 (Retro UNIX 8086 v1)
  2227                              <1> 	;
  2228                              <1> 	; Retro UNIX 8086 v1 modification: 
  2229                              <1> 	;	'Enable Multi Tasking'  system call instead 
  2230                              <1> 	;	of 'Emulator Trap' in original UNIX v1 for PDP-11.
  2231                              <1> 	;
  2232                              <1> 	; Retro UNIX 8086 v1 feature only!
  2233                              <1> 	;	Using purpose: Kernel will start without time-out
  2234                              <1> 	;	(internal clock/timer) functionality.
  2235                              <1> 	;	Then etc/init will enable clock/timer for
  2236                              <1> 	;	multi tasking. 
  2237                              <1> 	;
  2238                              <1> 	; INPUT ->
  2239                              <1> 	;	BL = 0 -> disable multi tasking
  2240                              <1> 	;	BL > 1 -> enable multi tasking (time sharing) 
  2241                              <1> 	; OUTPUT ->
  2242                              <1> 	;	none	
  2243                              <1> 	;
  2244                              <1> 	;  Note: Multi tasking is disabled during system
  2245                              <1> 	;	 initialization, it must be enabled by using
  2246                              <1> 	;	 this system call. (Otherwise, running proces 
  2247                              <1> 	;	 will not be changed by another process within
  2248                              <1> 	;	 run time sequence/schedule, if running process
  2249                              <1> 	;	 will not 'release' itself. Only 'wakeup' procedure
  2250                              <1> 	;	 for waiting processes and programmed timer events
  2251                              <1> 	;	 for other processes can change running process 
  2252                              <1> 	;	 while multi tasking is disabled.) ** 23/05/2016 **
  2253                              <1> 
  2254 0000E131 803D[B0030300]00    <1> 	cmp	byte [u.uid], 0 ; root ?
  2255                              <1> 	;ja	error
  2256 0000E138 0F87D3F8FFFF        <1> 	ja	badsys ; 14/05/2015
  2257                              <1> 	;
  2258 0000E13E FA                  <1> 	cli
  2259 0000E13F 881D[228E0100]      <1> 	mov	[multi_tasking], bl ; 0 to disable, >0 to enable
  2260 0000E145 E9A2F7FFFF          <1> 	jmp	sysret
  2261                              <1> 
  2262                              <1> systimer:
  2263                              <1> 	; 02/01/2017
  2264                              <1> 	; 21/12/2016
  2265                              <1> 	; 19/12/2016
  2266                              <1> 	; 10/12/2016 (callback)
  2267                              <1> 	; 10/06/2016
  2268                              <1> 	; 07/06/2016
  2269                              <1> 	; 06/06/2016
  2270                              <1> 	; 21/05/2016
  2271                              <1> 	; 19/05/2016
  2272                              <1> 	; 18/05/2016 - TRDOS 386 (TRDOS v2.0)
  2273                              <1> 	; (TRDOS 386 feature only!)
  2274                              <1> 	;
  2275                              <1> 	; (start or stop timer event(s))	
  2276                              <1> 	;
  2277                              <1> 	; INPUT ->
  2278                              <1> 	;	BL = Signal return byte (response byte)
  2279                              <1> 	;	     (Any requested value between 0 and 255)
  2280                              <1> 	;	     (Kernel will put it at the requested address)    	
  2281                              <1> 	;	BH = Time count unit
  2282                              <1> 	;	     0 = Stop timer event
  2283                              <1> 	;	     1 = 18.2 ticks per second
  2284                              <1> 	;	     2 = 10 milliseconds  		
  2285                              <1> 	;	     3 = 1 second (for real time clock interrupt) 	 
  2286                              <1> 	;	     4 = time/tick count in current time count unit
  2287                              <1> 	;	    // 10/12/2016			
  2288                              <1> 	;	    80h = Stop timer event (callback method)
  2289                              <1> 	;	    81h = 18.2 ticks per second, callback method
  2290                              <1> 	;	    82h = 10 milliseconds, callback method 	
  2291                              <1> 	;	    83h = 1 second (for RTC int), callback method 	
  2292                              <1> 	;	    84h = current time count unit, callback method
  2293                              <1> 	;
  2294                              <1> 	;	    Note: Only 03h or 83h will set real time clock
  2295                              <1> 	;		  (RTC) events (Others are for PIT events)! 	
  2296                              <1> 	;	
  2297                              <1> 	;	NOTE: If callback (user service) method is used,
  2298                              <1> 	;	    EDX will point to the return address (of service
  2299                              <1> 	;	    procedure) in user's space instead of signal 
  2300                              <1> 	;	    response byte address. (TRDOS 386 kernel will
  2301                              <1> 	;	    direct the cpu to that address -in user's space-
  2302                              <1> 	;	    at the return of system call or interrupt 
  2303                              <1> 	;	    just after the adjusted count/time is elapsed.)
  2304                              <1> 	;	    User's sevice routine must be ended with a
  2305                              <1> 	;	    'iret'. Normal return addresses from system 
  2306                              <1> 	;	    calls or and interrupts will be kept same except
  2307                              <1> 	;	    the timer returns. 			
  2308                              <1>      	;
  2309                              <1> 	;	BH = 0 -> Stop timer event
  2310                              <1> 	;	BL = Timer event number (1 to 255) if BH = 0     	
  2311                              <1> 	;	     If BL = 0, all timer events (which are belongs
  2312                              <1> 	;	      to running process) will be stopped 		    
  2313                              <1> 	;	ECX = Time/Tick count (depending on time count unit)
  2314                              <1> 	;	EDX = Signal return (Response) byte address
  2315                              <1> 	;	      (virtual address in user's memory space)
  2316                              <1> 	; OUTPUT ->
  2317                              <1> 	;	AL = Timer event number	(1 to 255) (max. value = 16)
  2318                              <1> 	;	IF BH Input = 0 & CF = 0 & AL = 0 -> 
  2319                              <1> 	;	     timer event(s) has/have been stopped/finished
  2320                              <1> 	;	CF = 1 & AL = 0 -> no timer setting space to set
  2321                              <1> 	;	CF = 1 & AL > 0 -> timer count unit is not usable
  2322                              <1> 	;
  2323                              <1> 	;	NOTE: To modify a time count for a user function,
  2324                              <1> 	;	      at first, current timer event must be stopped
  2325                              <1> 	;	      then a new timer event (which is related with
  2326                              <1> 	;	      same user function) must be started.
  2327                              <1> 	;		
  2328                              <1> 	;	      Signal return (response) byte may be used for 
  2329                              <1> 	;	      several purposes. Kernel will put this value 
  2330                              <1> 	;	      to requested address during timer interrupt,
  2331                              <1> 	;	      program/user can check this value to understand
  2332                              <1> 	;	      which event has been occurred and what is changed.
  2333                              <1> 	;	      (Multi timer events can share same signal address)
  2334                              <1> 	;	
  2335                              <1> 	;	NOTE: If the process is running while the time count
  2336                              <1> 	;	      is reached, kernel will put signal return (response)
  2337                              <1> 	;	      byte value at requested address during timer
  2338                              <1> 	;	      interrupt and the process will continue to run.
  2339                              <1> 	;	      Program/process must call (jump to) it's timer event
  2340                              <1> 	;	      function as required, for checking the timer event
  2341                              <1> 	;	      status via signal return (response) byte address. 
  2342                              <1> 	;
  2343                              <1> 	;	      If the process is not running (waiting or sleeping
  2344                              <1> 	;	      or released) while the time count is reached,
  2345                              <1> 	;	      it is restarted from where it left, to ensure
  2346                              <1> 	;	      proper multi media (video, audio, clock, timer)
  2347                              <1> 	;	      functionality.
  2348                              <1> 	;
  2349                              <1> 	;	      (It is better to use 'syswait' or 'syssleep',
  2350                              <1> 	;	      or 'sysrele' system call just after the timer
  2351                              <1> 	;	      function. Otherwise, timer events may block other
  2352                              <1> 	;	      processes which are not using timer events.)  	 		 			 		 	
  2353                              <1> 	;	     	      		 			
  2354                              <1> 	; Timer Event Structure: (max. 16 timer events, 16*16 bytes)
  2355                              <1> 	;       Owner:	        resb 1 ; 0 = free
  2356                              <1> 	;		  	       ;>0 = process number (u.uno)
  2357                              <1> 	;	Calback:	resb 1 ; 1 = callback, 0 = response byte
  2358                              <1> 	;	Interrupt:      resb 1 ; 0 = Timer interrupt (or none)
  2359                              <1> 	;		   	       ; 1 = Real Time Clock interrupt 
  2360                              <1> 	;	Response:       resb 1 ; 0 to 255, signal return value
  2361                              <1> 	;	Count Limit:	resd 1 ; count of ticks (total/set)
  2362                              <1> 	;	Current Count: 	resd 1 ; count of ticks (current)
  2363                              <1> 	;	Response Addr:  resd 1 ; response byte (pointer) address
  2364                              <1> 	;
  2365                              <1> 
  2366                              <1> 	; 19/12/2016 (timer callback)
  2367 0000E14A C605[60930100]00    <1> 	mov	byte [tcallback], 0 
  2368 0000E151 C605[61930100]00    <1> 	mov	byte [trtc], 0
  2369 0000E158 C705[D0030300]0000- <1> 	mov	dword [u.tcb], 0 ; this is not necessary...
  2369 0000E160 0000                <1>
  2370                              <1> 
  2371 0000E162 80FF80              <1> 	cmp	bh, 80h
  2372 0000E165 7225                <1> 	jb	short systimer_cb2
  2373 0000E167 7704                <1> 	ja	short systimer_cb0
  2374                              <1> 
  2375 0000E169 31D2                <1> 	xor	edx, edx ; 0, reset callback address
  2376 0000E16B EB0B                <1> 	jmp	short systimer_cb1
  2377                              <1> 
  2378                              <1> systimer_cb0:
  2379 0000E16D 80FF84              <1> 	cmp	bh, 84h	
  2380 0000E170 7764                <1> 	ja	short systimer_5 ;  undefined, error
  2381                              <1> 
  2382                              <1> 	;mov	byte [tcallback], 1 ; 19/12/2016
  2383 0000E172 FE05[60930100]      <1> 	inc	byte [tcallback]
  2384                              <1> 
  2385                              <1> systimer_cb1:
  2386 0000E178 0FB635[B3030300]    <1> 	movzx	esi, byte [u.uno] ; process number
  2387 0000E17F 66C1E602            <1> 	shl	si, 2	
  2388 0000E183 8996[0C010300]      <1> 	mov	[esi+p.tcb-4], edx ; set process timer callback address
  2389                              <1> 				   ; (overwrite prev value if it is set!)
  2390 0000E189 80E77F              <1> 	and	bh, 7Fh
  2391                              <1> 
  2392                              <1> systimer_cb2:
  2393 0000E18C 80FF02              <1> 	cmp	bh, 2
  2394 0000E18F 7445                <1>         je      short systimer_5  ; only 18.2 ticks per second is usable
  2395                              <1> 				  ; 10 milliseconds (100 Hertz) timer 
  2396                              <1> 				  ; will be set later (18/05/2016)
  2397 0000E191 774B                <1>         ja      short systimer_6 
  2398                              <1> 
  2399 0000E193 20FF                <1> 	and	bh, bh
  2400 0000E195 0F84BA000000        <1>         jz      systimer_9        ; stop timer event(s)
  2401                              <1> 
  2402                              <1> 	; bh = 1 (timer interrupt, 18.2 Hz, IBM PC/AT ROMBIOS default)
  2403                              <1> 
  2404                              <1> systimer_19:
  2405 0000E19B B00A                <1> 	mov	al, 10 ; (*)
  2406                              <1> 
  2407                              <1> systimer_0:
  2408 0000E19D B710                <1> 	mov	bh, 16
  2409                              <1> 	;
  2410 0000E19F 383D[238E0100]      <1> 	cmp	[timer_events], bh ; 16 ; 07/06/2016
  2411 0000E1A5 7319                <1> 	jnb 	short systimer_3  ; max. 16 timer events
  2412                              <1> 	;
  2413 0000E1A7 50                  <1> 	push	eax ; (*)
  2414                              <1> 
  2415 0000E1A8 BF[60040300]        <1> 	mov	edi, timer_set  ; beginning address of timer events
  2416                              <1> 				; setting space
  2417 0000E1AD 30C0                <1> 	xor	al, al ; 0
  2418                              <1> systimer_1:
  2419 0000E1AF FEC0                <1> 	inc	al
  2420 0000E1B1 803F00              <1> 	cmp	byte [edi], 0 	; is it free space ?
  2421 0000E1B4 7639                <1> 	jna	short systimer_7 ; yes
  2422 0000E1B6 FECF                <1> 	dec	bh
  2423 0000E1B8 7405                <1> 	jz	short systimer_2
  2424 0000E1BA 83C710              <1> 	add	edi, 16
  2425 0000E1BD EBF0                <1> 	jmp	short  systimer_1 ; next event space
  2426                              <1> 
  2427                              <1> systimer_2:
  2428 0000E1BF 58                  <1> 	pop	eax ; (*) discard
  2429                              <1> systimer_3:
  2430 0000E1C0 C605[64030300]00    <1> 	mov	byte [u.r0], 0
  2431                              <1> systimer_4:
  2432 0000E1C7 C705[C8030300]1B00- <1>         mov     dword [u.error], ERR_MISC
  2432 0000E1CF 0000                <1>
  2433                              <1>                                 ; one of miscellaneous/other errors
  2434 0000E1D1 E9F6F6FFFF          <1> 	jmp	error ; cf -> 1
  2435                              <1> 
  2436                              <1> systimer_5:
  2437 0000E1D6 883D[64030300]      <1> 	mov	[u.r0], bh ; Time count unit (=2 or >3)
  2438 0000E1DC EBE9                <1> 	jmp	short systimer_4 ; 07/06/2016
  2439                              <1> 
  2440                              <1> systimer_6:
  2441 0000E1DE 80FF04              <1> 	cmp	bh, 4
  2442 0000E1E1 77F3                <1>         ja      short systimer_5  ; undefined time count unit
  2443                              <1> 	;jb	short systimer_16	
  2444                              <1> 
  2445                              <1> 	;mov	al, 1	; default (use current timer unit)
  2446                              <1> 			; countdown value is in ECX ! 
  2447                              <1> 			; max. value of ecx = 4294967296/10
  2448                              <1>         ;jmp    short systimer_0
  2449                              <1> 	;jmp	short systimer_19	
  2450 0000E1E3 74B6                <1> 	je	short systimer_19
  2451                              <1> 
  2452                              <1> systimer_16:
  2453                              <1> 	; bh = 3
  2454                              <1> 	; timer event via real time clock interrupt
  2455                              <1> 	; interrupt/update frequency: 1 Hz (1 tick per second)
  2456                              <1> 	
  2457 0000E1E5 B0B6                <1> 	mov	al, 182 ; (*) ; 18.2 * 10
  2458 0000E1E7 FE05[61930100]      <1> 	inc	byte [trtc] ; timer event via real time clock
  2459 0000E1ED EBAE                <1>         jmp     short systimer_0
  2460                              <1> 
  2461                              <1> systimer_7:
  2462 0000E1EF A2[64030300]        <1> 	mov	[u.r0], al ; timer event number
  2463                              <1> 	;
  2464                              <1> 	; edi = address of empty timer event area
  2465 0000E1F4 A0[B3030300]        <1> 	mov	al, [u.uno]
  2466 0000E1F9 FA                  <1> 	cli 	; disable interrupts 
  2467 0000E1FA AA                  <1> 	stosb	; process number
  2468 0000E1FB A0[60930100]        <1> 	mov	al, [tcallback] ; timer callback flag
  2469 0000E200 AA                  <1> 	stosb 	; 1= callback method, 0= signal response byte method
  2470 0000E201 A0[61930100]        <1> 	mov	al, [trtc] ; timer interrupt type
  2471 0000E206 AA                  <1> 	stosb	; 1= real time clock, 0= programmable interval timer
  2472 0000E207 88D8                <1> 	mov	al, bl ; Signal return (Response) value
  2473 0000E209 AA                  <1> 	stosb   ; response byte
  2474 0000E20A 58                  <1> 	pop	eax ; (*) ; 10 or 182
  2475 0000E20B 89D3                <1> 	mov	ebx, edx ; virtual address for response/signal byte
  2476 0000E20D F7E1                <1> 	mul	ecx
  2477                              <1> 	; (eax = 10 * count of 18.2 Hz timer ticks)
  2478                              <1> 	; (count down step = 10)
  2479 0000E20F AB                  <1> 	stosd  ; count limit (reset value)
  2480 0000E210 AB                  <1> 	stosd  ; current count value
  2481                              <1> 
  2482                              <1> 	; 19/12/2016
  2483 0000E211 803D[60930100]00    <1> 	cmp	byte [tcallback], 0 ; timer callback method ?
  2484 0000E218 7604                <1> 	jna	short systimer_17 ; no	
  2485 0000E21A 89D8                <1> 	mov	eax, ebx ; virtual address for callback routine 
  2486 0000E21C EB0D                <1> 	jmp	short systimer_18
  2487                              <1> 
  2488                              <1> systimer_17: ; signal response byte method
  2489                              <1> 	; ebx = virtual address
  2490                              <1> 	; [u.pgdir] = page directory's physical address
  2491                              <1> 	; 20/02/2017
  2492 0000E21E FE05[62930100]      <1> 	inc	 byte [no_page_swap] ; 1 
  2493                              <1> 			; Do not add this page to swap queue
  2494                              <1> 			; and remove it from swap queue if it is
  2495                              <1> 			; on the queue.
  2496 0000E224 E8B580FFFF          <1> 	call	get_physical_addr
  2497 0000E229 721A                <1> 	jc	short systimer_8 ; 07/06/2016
  2498                              <1> 	; eax = physical address of the virtual address in user's space
  2499                              <1> systimer_18:
  2500 0000E22B AB                  <1> 	stosd	; response addr (physical) or callback addr (virtual)
  2501 0000E22C FE05[238E0100]      <1> 	inc	byte [timer_events] ; 07/06/201
  2502                              <1> 	; 02/01/2017
  2503 0000E232 0FB605[B3030300]    <1> 	movzx	eax, byte [u.uno]
  2504 0000E239 FE80[FF000300]      <1> 	inc	byte [eax+p.timer-1]	
  2505                              <1> 	;
  2506 0000E23F FB                  <1> 	sti 	; enable interrupts
  2507 0000E240 E9A7F6FFFF          <1> 	jmp	sysret
  2508                              <1> 
  2509                              <1> systimer_8:
  2510                              <1> 	; 10/06/2016
  2511                              <1> 	; 07/06/2016
  2512 0000E245 28C0                <1> 	sub	al, al ; 0
  2513 0000E247 8847F4              <1> 	mov	[edi-12], al ; clear process number (free timer event)
  2514                              <1> 	;mov	dword [edi], eax ; 0
  2515 0000E24A FB                  <1> 	sti
  2516 0000E24B A2[64030300]        <1> 	mov	[u.r0], al ; 0
  2517 0000E250 E977F6FFFF          <1> 	jmp	error
  2518                              <1> 
  2519                              <1> systimer_9:
  2520                              <1> 	; 10/06/2016
  2521                              <1> 	; 07/06/2016
  2522 0000E255 28C0                <1> 	sub	al, al
  2523 0000E257 A2[64030300]        <1> 	mov	byte [u.r0], al ; 0
  2524 0000E25C 3805[238E0100]      <1> 	cmp     byte [timer_events], al ;  0
  2525 0000E262 7631                <1> 	jna	short systimer_12
  2526                              <1> 
  2527                              <1> 	; Note: ecx and edx are undefined here
  2528                              <1> 	;	(for stop timer function)
  2529                              <1> 
  2530 0000E264 BE[60040300]        <1> 	mov	esi, timer_set  ; beginning address of timer events
  2531                              <1> 				; setting space	 
  2532 0000E269 A0[B3030300]        <1> 	mov	al, [u.uno]
  2533                              <1> 	
  2534 0000E26E B710                <1> 	mov	bh, 16
  2535                              <1> 
  2536 0000E270 08DB                <1> 	or	bl, bl
  2537 0000E272 7544                <1> 	jnz	short systimer_15
  2538                              <1> 
  2539                              <1> 	; clear timer event areas belong to current process
  2540                              <1> 	; (for stopping all timer events belong to current process) 
  2541 0000E274 FA                  <1> 	cli 	; disable interrupts
  2542                              <1> systimer_10:
  2543                              <1> 	; 10/06/2016
  2544                              <1> 	; 07/06/2016 	
  2545 0000E275 8A26                <1> 	mov	ah, [esi]
  2546 0000E277 08E4                <1> 	or	ah, ah ; 0 ?
  2547 0000E279 7411                <1> 	jz	short systimer_11
  2548 0000E27B 38C4                <1> 	cmp	ah, al ; is the process number (owner) same ?
  2549 0000E27D 750D                <1>         jne     short systimer_11 ; no
  2550                              <1> 
  2551                              <1> 	;mov	byte [esi], 0
  2552 0000E27F 66C7060000          <1> 	mov	word [esi], 0 ; clear
  2553                              <1> 	;mov	dword [esi+12], 0 ; clear
  2554                              <1> 
  2555 0000E284 FE0D[238E0100]      <1> 	dec	byte [timer_events]
  2556 0000E28A 7409                <1> 	jz	short systimer_12
  2557                              <1> 
  2558                              <1> systimer_11:
  2559 0000E28C FECF                <1> 	dec	bh
  2560 0000E28E 7405                <1> 	jz	short systimer_12
  2561 0000E290 83C610              <1> 	add	esi, 16
  2562 0000E293 EBE0                <1> 	jmp	short systimer_10
  2563                              <1> 
  2564                              <1> systimer_12:
  2565 0000E295 0FB635[B3030300]    <1> 	movzx	esi, byte [u.uno]
  2566 0000E29C 08DB                <1> 	or	bl, bl ; all timer events or one timer event ?
  2567 0000E29E 740C                <1> 	jz	short systimer_13
  2568 0000E2A0 8A9E[FF000300]      <1> 	mov	bl, [esi+p.timer-1]
  2569 0000E2A6 20DB                <1> 	and	bl, bl	; previous number of timer events for the process
  2570 0000E2A8 7408                <1> 	jz	short systimer_14
  2571 0000E2AA FECB                <1> 	dec	bl  ; previous number of timer events for the process - 1
  2572                              <1> systimer_13:
  2573 0000E2AC 889E[FF000300]      <1> 	mov	[esi+p.timer-1], bl ; 0 ; no timer events for process
  2574                              <1> systimer_14:
  2575 0000E2B2 FB                  <1> 	sti	; enable interrupts
  2576 0000E2B3 E934F6FFFF          <1> 	jmp	sysret
  2577                              <1> 
  2578                              <1> systimer_15:
  2579 0000E2B8 38FB                <1> 	cmp	bl, bh ; 16
  2580 0000E2BA 0F8707FFFFFF        <1>         ja      systimer_4      ; max. 16 timer events !
  2581                              <1> 	;
  2582 0000E2C0 88DA                <1> 	mov	dl, bl
  2583 0000E2C2 FECA                <1> 	dec	dl  ; 16 -> 15 ... 1 -> 0 
  2584 0000E2C4 C0E204              <1> 	shl	dl, 4 ; * 16
  2585 0000E2C7 0FB6FA              <1> 	movzx	edi, dl
  2586 0000E2CA 01F7                <1> 	add	edi, esi ; timer_set 
  2587                              <1> 	
  2588 0000E2CC 3A07                <1> 	cmp	al, [edi] ; process number
  2589 0000E2CE 0F85F3FEFFFF        <1>         jne     systimer_4
  2590                              <1> 	
  2591                              <1> 	; same process ID
  2592 0000E2D4 FA                  <1> 	cli	; disable interrupts
  2593                              <1>  	; 10/06/2016 ; 02/01/2017
  2594                              <1> 	;mov	byte [edi], 0 
  2595 0000E2D5 66C7070000          <1> 	mov	word [edi], 0 ; clear
  2596                              <1> 	;mov	dword [edi+12], 0 ; clear
  2597 0000E2DA FE0D[238E0100]      <1> 	dec	byte [timer_events]
  2598 0000E2E0 EBB3                <1> 	jmp	short systimer_12
  2599                              <1> 
  2600                              <1> sysvideo: ; VIDEO DATA TRANSFER FUNCTIONS
  2601                              <1> 	; 24/01/2021
  2602                              <1> 	; 23/01/2021
  2603                              <1> 	; 22/01/2021
  2604                              <1> 	; 18/01/2021, 19/01/2021
  2605                              <1> 	; 04/01/2021, 10/01/2021, 11/01/2021
  2606                              <1> 	; 01/01/2021, 02/01/2021, 03/01/2021
  2607                              <1> 	; 28/12/2020, 29/12/2020, 30/12/2020
  2608                              <1> 	; 25/12/2020, 26/12/2020
  2609                              <1> 	; 21/12/2020, 23/12/2020
  2610                              <1> 	; 12/12/2020, 14/12/2020
  2611                              <1> 	; 10/12/2020, 11/12/2020
  2612                              <1> 	; 03/12/2020, 04/12/2020
  2613                              <1> 	; 22/11/2020, 23/11/2020
  2614                              <1> 	; 21/11/2020 (TRDOS 386 v2.0.3)
  2615                              <1> 	; 12/05/2017
  2616                              <1> 	; 11/07/2016
  2617                              <1> 	; 13/06/2016
  2618                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  2619                              <1> 	;
  2620                              <1> 	; VIDEO DATA TRANSFER FUNCTIONS:
  2621                              <1> 	;
  2622                              <1> 	; Inputs:
  2623                              <1> 	;	BH = 0 = VIDEO BIOS Mode 3, tty/text mode data transfers
  2624                              <1> 	;	     BL = 
  2625                              <1> 	;		Bits 0&1, Transfer direction
  2626                              <1> 	;	     	 	0 - System to system
  2627                              <1> 	;			1 - User to system
  2628                              <1> 	;			2 - System to user
  2629                              <1> 	;			3 - User to user (undefined)
  2630                              <1> 	;		Bits 2&3, Transfer Type
  2631                              <1> 	;			0 - Display page transfer	
  2632                              <1> 	;	     		1 - Display page window transfer
  2633                              <1> 	;	     		2 - Frame/Viewport/Window address transfer
  2634                              <1> 	;			3 - Window handle transfer (undefined)
  2635                              <1> 	;		; 23/11/2020
  2636                              <1> 	;		Bits 4..7 - Reserved, undefined (must be 0)
  2637                              <1> 	;
  2638                              <1> 	;	     /// BL = 0 -> System to system (display page) transfer
  2639                              <1> 	;		 CL = Source page 
  2640                              <1> 	;		 DL = Destination page
  2641                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2642                              <1> 	;		 ECX = User' buffer address
  2643                              <1> 	;		 DL = Video page
  2644                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2645                              <1> 	;		(system window is in current/active display page)	 	 		
  2646                              <1> 	;		 ESI = User's buffer address
  2647                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2648                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2649                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2650                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2651                              <1>         ;                If BL = 5 ->
  2652                              <1> 	;		 EDI = Swap address (in user's memory space)
  2653                              <1> 	;		 (If swap address > 0, previous content of the window
  2654                              <1> 	;		 will be saved into swap area in user's memory space)		
  2655                              <1> 	;	     /// BL = 4 -> system to system transfer
  2656                              <1> 	;		 ESI = System's source buffer (video page) address
  2657                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2658                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2659                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2660                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2661                              <1> 	;		 EDI = System's destination buffer (video page) address
  2662                              <1> 	;		; 22/11/2020
  2663                              <1> 	;	     /// BL = 9&10 -> user to system, system to user transfer 
  2664                              <1> 	;		(system window is in current/active display page)	 	 		
  2665                              <1> 	;		 ESI = User's buffer address
  2666                              <1> 	;		  CX = offset in video page (char position in 80*25)
  2667                              <1> 	;		  DX = transfer count (character count, max. 80*25)
  2668                              <1>         ;                If BL = 5 ->
  2669                              <1> 	;		 EDI = Swap address (in user's memory space)
  2670                              <1> 	;		 (If swap address > 0, previous content of the window
  2671                              <1> 	;		 will be saved into swap area in user's memory space)	
  2672                              <1> 	;	     /// BL = 8 -> system to system transfer
  2673                              <1> 	;		 ESI = System's source buffer (video page) address
  2674                              <1> 	;		  CX = offset in video page (char position in 80*25)
  2675                              <1> 	;		  DX = transfer count (character count, max. 80*25)
  2676                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2677                              <1> 	;		 EDI = System's destination buffer (video page) address
  2678                              <1> 	;
  2679                              <1> 	;		; 23/11/2020 (major modification)
  2680                              <1> 	;		; 22/11/2020 (bugfixes and extensions)
  2681                              <1> 	;	BH = 1 = VGA Graphics (0A0000h) data transfers
  2682                              <1> 	;	     BL = 
  2683                              <1> 	;	     	x0h = Fill color (color in CL) (64K)
  2684                              <1> 	;		x1h = User to system display page transfer
  2685                              <1> 	;		x2h = System to user display page transfer
  2686                              <1> 	;		x3h = NOT bits in window (ECX, EDX)
  2687                              <1> 	;		x4h = Window copy (system to system)	
  2688                              <1> 	;	     	x5h = User to system window transfer
  2689                              <1> 	;	     	x6h = System to user window transfer
  2690                              <1> 	;		x7h = AND display page bytes with CL
  2691                              <1> 	;		x8h = OR display page bytes with CL
  2692                              <1> 	;		x9h = XOR display page bytes with CL
  2693                              <1> 	;		; 22/11/2020 (TRDOS v2.0.3)
  2694                              <1> 	;	        xAh = INC display page bytes
  2695                              <1> 	;	        xBh = DEC display page bytes
  2696                              <1> 	;	        xCh = NEG display page bytes
  2697                              <1> 	;	        xDh = NOT display page bytes
  2698                              <1> 	;		; 01/01/2021
  2699                              <1> 	;		xEh = masked window write
  2700                              <1> 	;		; 02/01/2021
  2701                              <1> 	;		xFh = write character (font)
  2702                              <1> 	;
  2703                              <1> 	;		x = 0 -> screen width = 320
  2704                              <1> 	;		x = 1 -> screen width = 640
  2705                              <1> 	;		x = 2 -> screen width = 800
  2706                              <1> 	;
  2707                              <1> 	;	     /// BL = 0 -> Fill color (all screen pixels)
  2708                              <1> 	;		 CL = Color value, 
  2709                              <1> 	;		 If CH > 0, color in CL will be mixed with pixel color  
  2710                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2711                              <1> 	;		 ECX = User buffer
  2712                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2713                              <1> 	;		(window in current display page and in current mode)		 		
  2714                              <1> 	;		 ESI = User's buffer address
  2715                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2716                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2717                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2718                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2719                              <1>        	;	     /// BL = 4 -> system to system (window) transfer 
  2720                              <1> 	;		 ESI = System's source buffer (video page) address
  2721                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2722                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2723                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2724                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2725                              <1> 	;		 EDI = System's destination buffer (video page) address
  2726                              <1> 	;	     /// BL = 3 -> NOT byte in display page/memory 
  2727                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2728                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2729                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2730                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2731                              <1> 	;	     /// BL = 7,8,9 -> Display page pixel operations
  2732                              <1> 	;				(and, or, xor)
  2733                              <1> 	;		 CL = color
  2734                              <1> 	;		; 22/11/2020	
  2735                              <1> 	;	     /// BL = 10..13 -> Display page pixel operations
  2736                              <1> 	;				(inc, dec, neg, not)
  2737                              <1> 	;	     /// BL = 14 -> Masked color change
  2738                              <1> 	;		 ESI = User's mask buffer address
  2739                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2740                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2741                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2742                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2743                              <1> 	;		 EDI = (Mask) Color
  2744                              <1> 	;		    EBX bit 16 to 18 -> mask operation/option
  2745                              <1> 	;			0 = new color (in edi)
  2746                              <1> 	;			1 = add color (in edi) -up to 0FFh-
  2747                              <1> 	;			2 = average color (in edi) -(current+edi)/2-
  2748                              <1> 	;			3 = sub color (in edi) -down to 0-
  2749                              <1> 	;			4 = inc	color -up to 0FFh-
  2750                              <1> 	;			5 = dec	color -down to 0-
  2751                              <1> 	;			6 = not color
  2752                              <1> 	;			7 = neg color
  2753                              <1> 	;	     /// BL = 15 -> Write character (font) -in current mode-
  2754                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2755                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2756                              <1> 	;		  DL = Character's ASCII code
  2757                              <1> 	;		  DH = Character's color
  2758                              <1> 	;		    EBX bit 16 -> character size option
  2759                              <1> 	;			0 = 8x16 character font
  2760                              <1> 	;			1 = 8x8 character font
  2761                              <1> 	;		    EBX bit 17 & 18 -> scale	
  2762                              <1> 	;			0 = 1/1 (8 pixels per char row)
  2763                              <1> 	;			1 = 2/1 (16 pixels per char row)
  2764                              <1> 	;			2 = 4/1 (32 pixels per char row) 
  2765                              <1> 	;			3 = 8/1 (64 pixels per char row)
  2766                              <1> 	;		; 05/01/2021
  2767                              <1> 	;		    EBX bit 19 -> user font option (1 = user font)
  2768                              <1> 	;	
  2769                              <1> 	;	BH = 2 = Super VGA, LINEAR FRAME BUFFER data transfers
  2770                              <1> 	;	     BL = 
  2771                              <1> 	;	     	0 = Fill color (color in ECX) (vbe mode screen size)
  2772                              <1> 	;		1 = User to system display page transfer
  2773                              <1> 	;		2 = System to user display page transfer
  2774                              <1> 	;		3 = NOT bits in window (ECX, EDX)
  2775                              <1> 	;		4 = Window copy (system to system)	
  2776                              <1> 	;	     	5 = User to system window transfer
  2777                              <1> 	;	     	6 = System to user window transfer
  2778                              <1> 	;		7 = AND display page bytes with ECX
  2779                              <1> 	;		8 = OR display page bytes with ECX
  2780                              <1> 	;		9 = XOR display page bytes with ECX
  2781                              <1> 	;		; 22/11/2020 (TRDOS v2.0.3)
  2782                              <1> 	;	        10 = INC display page bytes
  2783                              <1> 	;	        11 = DEC display page bytes
  2784                              <1> 	;	        12 = NEG display page bytes
  2785                              <1> 	;	        13 = NOT display page bytes
  2786                              <1> 	;		; 01/01/2021
  2787                              <1> 	;		14 = masked window write
  2788                              <1> 	;		; 02/01/2021
  2789                              <1> 	;		15 = write character (font)
  2790                              <1> 	;
  2791                              <1> 	;		; 25/12/2020	
  2792                              <1> 	;		High word of EBX contain VESA VBE mode for resolution
  2793                              <1> 	;		(if hw of ebx = 0, current vesa vbe mode will be used)
  2794                              <1> 	;
  2795                              <1> 	;	     /// BL = 0 -> Fill color (all screen pixels)
  2796                              <1> 	;		 CL = Color value, 
  2797                              <1> 	;		 If CH > 0, color in CL will be mixed with pixel color 
  2798                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2799                              <1> 	;		 ECX = User buffer
  2800                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2801                              <1> 	;		(window in current display page and in current mode)	 	 		
  2802                              <1> 	;		 ESI = User's buffer address
  2803                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2804                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2805                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2806                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2807                              <1> 	;	     /// BL = 4 -> system to system (window) transfer 
  2808                              <1> 	;		 ESI = System's source buffer (video page) address
  2809                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2810                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2811                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2812                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2813                              <1> 	;		 EDI = System's destination buffer (video page) address
  2814                              <1> 	;	     /// BL = 3 -> NOT byte in display page/memory 
  2815                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2816                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2817                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2818                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2819                              <1> 	;	     /// BL = 7,8,9 -> Display page pixel operations
  2820                              <1> 	;				(and, or, xor)
  2821                              <1> 	;		 CL = color (for 8bpp)
  2822                              <1> 	;		 CX = color (for 16bpp)
  2823                              <1> 	;		ECX = color (for 24bpp, 24 bits of ECX are used)	 	
  2824                              <1> 	;		ECX = color (for 32bpp)
  2825                              <1> 	;		; 22/11/2020	
  2826                              <1> 	;	     /// BL = 10..13 -> Display page pixel operations
  2827                              <1> 	;				(inc, dec, neg, not)
  2828                              <1> 	;	     /// BL = 14 -> Masked color change
  2829                              <1> 	;		 ESI = User's mask buffer address
  2830                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2831                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2832                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2833                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2834                              <1> 	;		 EDI = (Mask) Color
  2835                              <1> 	;		    EBX bit 16 to 18 -> mask operation/option
  2836                              <1> 	;			0 = new color (in edi)
  2837                              <1> 	;			1 = add color (in edi) -up to 0FFFFFFFFh-
  2838                              <1> 	;			2 = average color (in edi) -(current+edi)/2-
  2839                              <1> 	;			3 = sub color (in edi) -down to 0-
  2840                              <1> 	;			4 = inc	color -up to 0FFFFFFFFh-
  2841                              <1> 	;			5 = dec	color -down to 0-
  2842                              <1> 	;			6 = not color
  2843                              <1> 	;			7 = neg color
  2844                              <1> 	;	     /// BL = 15 -> Write character (font) -in current mode-
  2845                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2846                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2847                              <1> 	;		  DL = Character's ASCII code
  2848                              <1> 	;		  DH = Character's color
  2849                              <1> 	;		    EBX bit 16 -> character size option
  2850                              <1> 	;			0 = 8x16 character font
  2851                              <1> 	;			1 = 8x8 character font
  2852                              <1> 	;		    EBX bit 17 & 18 -> scale	
  2853                              <1> 	;			0 = 1/1 (8 pixels per char row)
  2854                              <1> 	;			1 = 2/1 (16 pixels per char row)
  2855                              <1> 	;			2 = 4/1 (32 pixels per char row) 
  2856                              <1> 	;			3 = 8/1 (64 pixels per char row)
  2857                              <1> 	;		; 05/01/2021
  2858                              <1> 	;		    EBX bit 19 -> user font option (1 = user font)
  2859                              <1> 	;
  2860                              <1> 	;		Example: (21/11/2020)
  2861                              <1> 	;			esi = 0B0000h (window start value)
  2862                              <1> 	;			ecx = 00000000h (start at row 0, column 0) 
  2863                              <1> 	;			edx = 0018004Fh (end at row 24,column 79)
  2864                              <1> 	;			row count= 25, column count = 80
  2865                              <1> 	;			(end) byte offset = (80*2)*24+(79*2) = 3998	
  2866                              <1> 	;			end value of esi = 0B8F9Eh (last word of page)
  2867                              <1> 	;			(! end address is included to transfer !)
  2868                              <1> 	;			((just as line start and line end coordinates)) 
  2869                              <1> 	;
  2870                              <1> 	; Outputs:
  2871                              <1> 	;	EAX = transfer/byte count
  2872                              <1> 	;
  2873                              <1> 	;	NOTE: If the source or destination address passes out of
  2874                              <1> 	;	video pages (display memory limits), data will not be transferred
  2875                              <1> 	;	and EAX will return as 0.
  2876                              <1> 	;
  2877                              <1> 	; 04/01/2021
  2878                              <1> 	; PIXEL READ/WRITE (in current/active video mode)
  2879                              <1> 	;
  2880                              <1> 	;	BH = 3 = Read/Write pixel(s) -for all graphics modes-
  2881                              <1> 	;	     BL = 
  2882                              <1> 	;		0 = Read pixel
  2883                              <1> 	;		1 = Write pixel
  2884                              <1> 	;	     	2 = swap pixel colors
  2885                              <1> 	;		3 = mix pixel colors
  2886                              <1> 	;
  2887                              <1> 	;	      > 3 = invalid/unimplemented	
  2888                              <1> 	;		
  2889                              <1> 	;	     CL = color for writing pixel(s) or
  2890                              <1>  	;	     ECX = color for writing pixel(s) in true color modes
  2891                              <1> 	;
  2892                              <1> 	;	     EDX = Offset from start of video memory (0A0000h)
  2893                              <1> 	;		   or start of linear frame buffer
  2894                              <1> 	; Note:
  2895                              <1> 	;	Pixel read/write will be performed in current video mode. 
  2896                              <1> 	;	If [CRT_MODE] < 0FFh, 0A0000h will be used 
  2897                              <1> 	;	   as video memory and limit will be 65536
  2898                              <1> 	;	   (new/mix pixel color will be in CL)  	
  2899                              <1> 	;	if [CRT_MODE] = 0FFh (VESA VBE video mode)
  2900                              <1> 	;	   LFB base address will be used as video memory
  2901                              <1> 	;	   and limit will be video page size
  2902                              <1> 	;	   (new/mix pixel color will be in CL)  
  2903                              <1> 	;
  2904                              <1> 	; Outputs:
  2905                              <1> 	;	EAX = pixel color (according to BL and ECX input)
  2906                              <1> 	;	EAX = 0 (pixel color is 0 or there is an error)
  2907                              <1> 	;	     (BL will return as 0FFh if there is an error) 	
  2908                              <1> 	;
  2909                              <1> 	; DIRECT (STANDARD VGA/CGA) DISPLAY MEMORY ACCESS FUNCTIONS:
  2910                              <1> 	;
  2911                              <1> 	;	BH = 4 = CGA direct video memory (0B8000h, 32K) access
  2912                              <1> 	;		Page directory & page tables of the user's
  2913                              <1> 	;		program will be updated to direct access to
  2914                              <1> 	;		0B8000h (32K) video (CGA, color) memory; if
  2915                              <1> 	;		there is not a permission conflict or lock!  
  2916                              <1> 	;	        (User's program/process will have permission to
  2917                              <1> 	;		access locked display memory if the owner is
  2918                              <1> 	;		it's parent.)
  2919                              <1>         ;
  2920                              <1> 	;	    Screen width = 320	
  2921                              <1> 	;
  2922                              <1> 	;	BH = 5 = VGA direct video memory (0A0000h, 64K) access
  2923                              <1> 	;		Page directory & page tables of the user's
  2924                              <1> 	;		program will be updated to direct access to
  2925                              <1> 	;		0A0000h (64K) video (VGA) memory; if there is not
  2926                              <1> 	;		a permission conflict or lock!  
  2927                              <1> 	;	        (User's program/process will have permission to
  2928                              <1> 	;		access locked display memory if the owner is
  2929                              <1> 	;		it's parent.)
  2930                              <1> 	;	
  2931                              <1> 	;	    ; 23/11/2020		
  2932                              <1> 	;	    Screen width options = 320, 640, 800 
  2933                              <1> 	;			
  2934                              <1> 	; Outputs:
  2935                              <1> 	;	EAX = Display memory address for direct access
  2936                              <1> 	;	      0A0000h for VGA, 0B8000h for CGA	
  2937                              <1> 	;	(Display memory size: 32K for CGA, 64K for VGA)
  2938                              <1> 	; 	EAX = 0 if display page access permission has been denied. 
  2939                              <1> 	;	      (Locked!) 	
  2940                              <1> 	;	      	 	
  2941                              <1> 	; LINEAR FRAME BUFFER ACCESS FUNCTIONS:
  2942                              <1> 	;
  2943                              <1> 	;	BH = 6 = Linear Frame Buffer direct video memory access
  2944                              <1> 	;
  2945                              <1> 	;		Page directory & page tables of the user's
  2946                              <1> 	;		program will be updated to direct access to
  2947                              <1> 	;		the configured LFB (Linear Frame Buffer) address,
  2948                              <1> 	;		if there is not a permission conflict or lock!  
  2949                              <1> 	;	        (User's program/process will have permission to
  2950                              <1> 	;		access locked display memory if the owner is
  2951                              <1> 	;		it's parent.)
  2952                              <1> 	;
  2953                              <1> 	;	   ; 10/12/2020
  2954                              <1> 	;	   BL = 0FFh -> Direct LFB access for current video mode
  2955                              <1> 	;	   BL = XXh < 0FFh -> Direct LFB access
  2956                              <1> 	; 			      for VESA video mode 1XXh	
  2957                              <1> 	;		
  2958                              <1> 	;		Return: EAX = Linear Frame Buffer address
  2959                              <1> 	;			(EAX = 0 -> error)
  2960                              <1> 	;		     If EAX > 0
  2961                              <1> 	;			EDX = Frame Buffer Size in bytes
  2962                              <1> 	;		         BH = Requested Video Mode - 100h
  2963                              <1> 	;		              (VESA VBE video modes)	
  2964                              <1> 	;		         BL = bits per pixel
  2965                              <1> 	;			      8 = 256 colors, 8
  2966                              <1> 	;		             16 = 65536 colors, 5-6(G)-5 
  2967                              <1> 	;		             24 = RGB, 16M colors, 8-8-8
  2968                              <1> 	;		             32 = RGB + alpha bytes, 8-8-8-8
  2969                              <1> 	;		     If BH = 0FFh
  2970                              <1> 	;		        BL = VGA/CGA video mode (also EAX = 0)
  2971                              <1> 	;
  2972                              <1> 	;		** Function will return with EAX = 0 if the mode
  2973                              <1> 	;		is not a valid VESA VBE video mode as 1??h ** 	
  2974                              <1> 	;
  2975                              <1> 	;		ECX = Pixel resolution
  2976                              <1> 	;		      CX = Width (320, 640, 800, 1024, 1366, 1920)
  2977                              <1> 	;		      High 16 bits of ECX = Height 
  2978                              <1> 	;
  2979                              <1> 	; 	23/11/2020
  2980                              <1> 	; ***	GET VIDEO MODE & LINEAR FRAME BUFFER INFO   
  2981                              <1> 	;	(This function -7- also is used for VGA and CGA modes)
  2982                              <1> 	; 	
  2983                              <1> 	;	BH = 7 = Get Linear Frame Buffer info
  2984                              <1> 	;
  2985                              <1> 	;	   ; 22/01/2021	
  2986                              <1> 	;	   ; 10/12/2020
  2987                              <1> 	;	   BL = any -not used- (22/01/2021)
  2988                              <1> 	;	
  2989                              <1> 	;		Return:
  2990                              <1> 	;		EAX = Frame Buffer Address (0 = is not in use)
  2991                              <1> 	;		EDX = Frame Buffer Size in bytes
  2992                              <1> 	;		 BH = Current Video Mode - 100h  ; 22/01/2021
  2993                              <1> 	;		     (VESA VBE video modes)	
  2994                              <1> 	;		 BL = bits per pixel
  2995                              <1> 	;			8 = 256 colors, 8
  2996                              <1> 	;		       16 = 65536 colors, 5-6(G)-5 
  2997                              <1> 	;		       24 = RGB, 16M colors, 8-8-8
  2998                              <1> 	;		       32 = RGB + alpha bytes, 8-8-8-8
  2999                              <1> 	;		If BH = 0FFh
  3000                              <1> 	;		   BL = VGA/CGA video mode (also EAX = 0)						
  3001                              <1> 	;
  3002                              <1> 	;		Note:	
  3003                              <1> 	;		Alpha byte will be used as virtual color index.
  3004                              <1> 	;		(32 bit pixel colors.. byte 0,1,2 rgb and 3 alpha)
  3005                              <1> 	;
  3006                              <1> 	;		** Function will return with EAX = 0 if the mode
  3007                              <1> 	;		is not a valid VESA VBE video mode as 1??h ** 	
  3008                              <1> 	;
  3009                              <1> 	;		ECX = Pixel resolution
  3010                              <1> 	;		      CX = Width (320, 640, 800, 1024, 1366, 1920)
  3011                              <1> 	;		      High 16 bits of ECX = Height  
  3012                              <1> 	;
  3013                              <1> 	;	NOTE: Each process will have it's own frame buffer
  3014                              <1> 	;	      address and resolution parameters in 'u' area.
  3015                              <1> 	;	      Then, if the current frame buffer & resolution
  3016                              <1> 	;	      is different, frame buffer r/w functions
  3017                              <1> 	;	      will use scale factor to convert process's
  3018                              <1>         ;             pixel coordinates to actual screen coordinates.                            
  3019                              <1> 	;	      resolution -> dimensional scale
  3020                              <1> 	;	      color size -> color scale
  3021                              <1> 	;	     * RGB (TRUE) colors to 256 colors conversion:	
  3022                              <1>         ;             TRUE Colors -> 8,8,8 (R,G,B; byte 0 is R)            
  3023                              <1> 	;	      256 colors -> 2,2,2,2 (R,G,B,L; bit 0&1 is R)
  3024                              <1> 	; 		  bit 6&7 -> luminosity base level (0,1,2,3)
  3025                              <1> 	;		  bit 4&5 -> blue level (0,1,2,3)
  3026                              <1> 	;		  bit 2%3 -> green level (0,1,2,3)
  3027                              <1> 	;		  bit 0&1 -> red level (0,1,2,3)
  3028                              <1> 	;	      Example: total red level : luminosity + red level   				
  3029                              <1> 	;	      Luminosity base level: 0 -> 16
  3030                              <1> 	;		 		     1 -> 32
  3031                              <1> 	;				     2 -> 64
  3032                              <1> 	;				     3 -> 128
  3033                              <1> 	;	      Color level:	
  3034                              <1> 	;				    0 -> 0
  3035                              <1> 	;				    1 -> luminosity level
  3036                              <1> 	;				    2 -> luminosity level + 64
  3037                              <1> 	;				    3 -> 255
  3038                              <1> 	;	     Luminosity base level = min (R,G,B)
  3039                              <1> 	;			if it is <16, it will be set to 16
  3040                              <1> 	;	     Color levels: Color values are fixed to (nearest) 
  3041                              <1> 	;		   one of all possible set level (step) values
  3042                              <1> 	;		   (according to luminosity base level); then
  3043                              <1> 	;		   color levels are set to R-L, G-L, B-L.
  3044                              <1> 	;	 For example: If luminosity base level is 32
  3045                              <1> 	;		  all possible set values are 0, 32, 96, 255. 	 			
  3046                              <1> 	;
  3047                              <1> 	;	    * RGB (TRUE) colors to 16 colors conversion:
  3048                              <1> 	;	    16 colors: R,B,G,L bits (4 bits)
  3049                              <1> 	;	    	   If any one of R,G,B >= 128 L = 1 		     	
  3050                              <1>  	;		   If max. value of (R,G,B) >= 32, it is 1
  3051                              <1> 	;		      else all color bits (R&G&B&L) are 0
  3052                              <1> 	;		   If the second value >= max. value / 2
  3053                              <1> 	;		      it is 1
  3054                              <1> 	;		   If third value value >= max. value / 2
  3055                              <1> 	;		      it is 1
  3056                              <1> 	;	    Example: R = 132, G = 64, B = 78
  3057                              <1> 	;		     L = 1, R = 1
  3058                              <1> 	;		     G < 66 --> G = 0
  3059                              <1> 	;		     B >= 66 --> B = 1
  3060                              <1> 	;
  3061                              <1> 	; 10/12/2020
  3062                              <1> 	; SET VIDEO MODE (& RETURN LFB INFO for VESA VBE VIDEO MODES) 	
  3063                              <1> 	;	
  3064                              <1> 	;	BH = 8 = Set Video Mode
  3065                              <1> 	;		
  3066                              <1> 	;		BL = Requested Video Mode (method)
  3067                              <1> 	;		If BL = 0FFh
  3068                              <1> 	;		   CX = VESA VBE Video Mode
  3069                              <1> 	;		   ; 11/12/2020
  3070                              <1> 	;		   If EDX > 0 -> LFB INFO (user) buffer addr	
  3071                              <1> 	;		If BL < 0FFh, it is VGA/CGA video mode and
  3072                              <1> 	;			CX & EDX will not be used
  3073                              <1> 	;
  3074                              <1> 	;	    NOTE: The last VESA VBE video mode is 11Bh but
  3075                              <1> 	;	    TRDOS 386 will permit to set video mode upto 11Fh.
  3076                              <1> 	;	    Above 11Fh, from 140h to 1FEh, it will be accepted
  3077                              <1> 	;	    as Bochs/Plex86 emulator video mode and it will be
  3078                              <1> 	;	    used only if [vbe3] = 2 and detected
  3079                              <1> 	;	    video bios is BOCHS/PLEX86/QEMU/VIRTUALBOX vbios.
  3080                              <1> 	;	 	  	 		 	
  3081                              <1> 	; Outputs:
  3082                              <1> 	;	EAX = Requested (Proper) video mode number + 1
  3083                              <1> 	;	      ("dec eax" by user will give requested video mode),
  3084                              <1> 	;
  3085                              <1> 	;	If BL input is 0FFh
  3086                              <1> 	;	   EDX = LFBINFO table/structure (in user's buffer addr)	
  3087                              <1> 	;	   EDX = 0 -> Invalid LFBINFO (do not use it)
  3088                              <1> 	;
  3089                              <1> 	;	EAX = 0 -> Error (but EDX will not be changed)
  3090                              <1> 	;
  3091                              <1> 	; 03/12/2020
  3092                              <1> 	; VESA VBE3 VIDEO BIOS (32 bit) PROTECTED MODE INTERFACE SETTINGS
  3093                              <1> 	;	
  3094                              <1> 	;	BH = 9 = set/get VBE3 Protected Mode Interface parameters
  3095                              <1> 	;		
  3096                              <1> 	;		BL = 0 - Disable protected mode interface
  3097                              <1> 	;			([pmi32] = 0)
  3098                              <1> 	;		 	Return: AL = 1	
  3099                              <1> 	;		BL = 1 - Enable protected mode Interface
  3100                              <1> 	;			([pmi32] = 1)
  3101                              <1> 	;			Return: AL = 2
  3102                              <1> 	;		BL = 2 - Get protected mode interface status
  3103                              <1> 	;			Return: AL = [pmi32] + 1 (AL = 1 or 2)
  3104                              <1> 	;
  3105                              <1> 	;		If [vbe3] <> 3 --> AL = 0
  3106                              <1> 	;
  3107                              <1> 	;		; 17/01/2021
  3108                              <1> 	;		BL = 3 - Disable/Cancel restore permission to user
  3109                              <1> 	;			Return: AL = 1 (if disabled) or 0
  3110                              <1> 	;		BL = 4 - Enable/Give restore permission to user
  3111                              <1> 	;			Return: AL = 2 (if enabled) or 0
  3112                              <1> 	;		BL = 5 - Get video state save/restore status
  3113                              <1> 	;			 (permission status)
  3114                              <1> 	;		        Return: AL = Status (enabled = 1)
  3115                              <1> 	;				; 22/01/2021
  3116                              <1> 	;				AH = state options ([srvso])
  3117                              <1> 	;		BL = 6 - Return VESA VBE number/status
  3118                              <1> 	;		        Return: AX = status
  3119                              <1> 	;			      if AH =  2, AL > 0 : Emulator
  3120                              <1> 	;				 AH =  3, VESA VBE3 video bios			 	 
  3121                              <1> 	;
  3122                              <1> 	;		BL > 6 : not implemented (17/01/2021)
  3123                              <1> 	;
  3124                              <1> 	;	; 19/01/2021 ([u.uid] check)	
  3125                              <1> 	;	Note: Enabling/Disabling are done by root ([u.uid] = 0)
  3126                              <1> 	;	      while [multi_tasking] = 0.
  3127                              <1> 	;
  3128                              <1>     	; 23/12/2020
  3129                              <1> 	; VIDEO MEMORY MAPPING:
  3130                              <1> 	;	BH = 10 = Map video memory to user's buffer
  3131                              <1> 	;
  3132                              <1> 	;	   BL = 0 : CGA memory (0B8000h) map (32K)
  3133                              <1> 	;	   BL = 1 : VGA memory (0A0000h) map (64K)
  3134                              <1> 	;	   BL = 2 : SVGA memory (LFB) map to user's buffer
  3135                              <1> 	;
  3136                              <1> 	;	ECX = User's buffer addr (low 12 bits will be cleared)
  3137                              <1> 	;	EDX = Buffer size in bytes (if BL = 2)
  3138                              <1> 	;		(will be trimmed if LFB size < EDX)
  3139                              <1> 	; Return:				
  3140                              <1>         ;	EAX = physical address of video memory (buffer)
  3141                              <1> 	;	EBX = mapped (actual) size of video memory (bytes)
  3142                              <1> 	;	ECX = virtual start address of user's video buffer 
  3143                              <1> 	;	EDX is same with EDX input
  3144                              <1> 	;
  3145                              <1> 	;	(Note: Memory page boundaries will be applied 
  3146                              <1> 	;	 to buffer size and buff start addr by rounding down.
  3147                              <1> 	;	 Rounded size & address values must not be zero.) 
  3148                              <1> 	;	-Normally, it is expected to request mapping by using
  3149                              <1> 	;	 correct buffer size of current or desired video mode-
  3150                              <1> 	;
  3151                              <1> 	;	EAX = 0 -> error ! memory can not mapped to user
  3152                              <1> 	;
  3153                              <1> 	; 04/01/2021
  3154                              <1> 	; SET/READ COLOR PALETTE (set/read DAC color registers)
  3155                              <1> 	;	((256 colors (8bpp) VGA/CGA video hardware feature))
  3156                              <1> 	;
  3157                              <1> 	;	BH = 11 = Set/Read DAC color registers
  3158                              <1> 	;
  3159                              <1> 	;	   (B<4 Original method for std VGA video hardware)
  3160                              <1> 	;	   BL = 0 : Read all DAC color registers (256 colors)
  3161                              <1> 	;	       (6 bit colors, in RGB order)	
  3162                              <1> 	;	   BL = 1 : Set all DAC color registers (256 colors)
  3163                              <1> 	;	       (6 bit colors, in RGB order)
  3164                              <1> 	;	   BL = 2 : Read single DAC color register
  3165                              <1> 	;	       (6 bit color, in RGB order)
  3166                              <1> 	;		((EAX will return with color value))
  3167                              <1> 	;		CL = DAC color register (index)
  3168                              <1> 	;	   BL = 3 : Set/Write single DAC color register
  3169                              <1> 	;	       (6 bit color, in RGB order, bit 6&7 are 0)
  3170                              <1> 	;		ECX byte 0 - DAC color register
  3171                              <1> 	;		ECX byte 1 - Red (6 bit)
  3172                              <1> 	;		ECX byte 2 - Green (6 bit)
  3173                              <1> 	;		ECX byte 3 - Blue (6 bit)
  3174                              <1> 	;	   (BL>3 Alternative method for BMP files etc.)	
  3175                              <1> 	;	   BL = 4 : Read all DAC color registers (256 colors)
  3176                              <1> 	;	       (8 bit colors, in BGR order, bit 0&1 is 0)	
  3177                              <1> 	;	   BL = 5 : Set all DAC color registers (256 colors)
  3178                              <1> 	;	       (8 bit colors, in BGR order, bit 0&1 is 0)
  3179                              <1> 	;	   BL = 6 : Read single DAC color register
  3180                              <1> 	;	       (8 bit color, in BGR order, bit 0&1 is 0)
  3181                              <1> 	;		((EAX will return with color value))
  3182                              <1> 	;		CL = DAC color register (index)
  3183                              <1> 	;	   BL = 7 : Set/Write single DAC color register
  3184                              <1> 	;	       (8 bit color, bit 0&1 are 0)
  3185                              <1> 	;		ECX byte 0 - DAC color register
  3186                              <1> 	;		ECX byte 1 - Blue (8 bit)
  3187                              <1> 	;		ECX byte 2 - Green (8 bit)
  3188                              <1> 	;		ECX byte 3 - Red (8 bit)
  3189                              <1> 	;
  3190                              <1> 	;	  BL > 7 : invalid (not implemented)
  3191                              <1> 	;
  3192                              <1> 	;   if BL bit 2 is 1, 6 bit colors converted to 8 bit colors
  3193                              <1> 	;	(low two bits of color bytes will be 0)
  3194                              <1> 	;     ((color byte 00111111b will be converted to 11111100b))
  3195                              <1> 	;	and RGB byte order will be 
  3196                              <1> 	;		byte 0 - Blue (low 2 bits ares 0)
  3197                              <1> 	;		byte 1 - Green (low 2 bits are 0)		
  3198                              <1> 	;		byte 2 - Red (low 2 bits are 0)
  3199                              <1> 	;		byte 3 - pad (or zero byte)
  3200                              <1> 	;	and 256 colors buffer size must be 256*4 = 1024 bytes
  3201                              <1> 	;   if BL bit 2 is 0, 6 bit colors will be used directly
  3202                              <1> 	;	  (high two bits of 8 bit color bytes will be 0)
  3203                              <1> 	;     ((dac color 111111b will be converted to 00111111b))	
  3204                              <1> 	;		byte 0 - Red (high 2 bits are 0)
  3205                              <1> 	;		byte 1 - Green (high 2 bits are 0)		
  3206                              <1> 	;		byte 2 - Blue (high 2 bits are 0)
  3207                              <1> 	;	and 256 colors buffer size must be 256*3 = 768 bytes
  3208                              <1> 	;
  3209                              <1> 	;	ECX = User's buffer addr (256*3 = 768 bytes) or
  3210                              <1> 	;	      Color 
  3211                              <1> 	;
  3212                              <1> 	; Return:				
  3213                              <1>         ;	EAX = buffer size (for BL input = 0,1,4,5)
  3214                              <1> 	;	      or color value (for BL input = 2,3,6,7)
  3215                              <1> 	;
  3216                              <1> 	; 10/01/2021
  3217                              <1> 	; SET/READ FONT DATA
  3218                              <1> 	;
  3219                              <1> 	;	BH = 12 = Set/Read Character Font Data
  3220                              <1> 	;
  3221                              <1> 	;	   BL = 0 : Disable system font overwrite
  3222                              <1> 	;	   BL = 1 : Enable system font overwrite
  3223                              <1> 	;	   BL = 2 : Read system font 8x8
  3224                              <1> 	;	   BL = 3 : Read system font 8x14
  3225                              <1> 	;	   BL = 4 : Read system font 8x16
  3226                              <1> 	;	   BL = 5 : Read user defined font 8x8
  3227                              <1> 	;	   BL = 6 : Read user defined font 8x16
  3228                              <1> 	;	   BL = 7 : Write system font 8x8
  3229                              <1> 	;	   BL = 8 : Write system font 8x14
  3230                              <1> 	;	   BL = 9 : Write system font 8x16
  3231                              <1> 	;	   BL = 10 : Write user defined font 8x8
  3232                              <1> 	;	   BL = 11 : Write user defined font 8x16
  3233                              <1> 	;
  3234                              <1> 	;	  BL > 11 : invalid (not implemented)
  3235                              <1> 	;
  3236                              <1> 	;	For BL = 1 to 11
  3237                              <1> 	;	   ECX = number of characters (>= 256)
  3238                              <1> 	;	   EDX = first character (ascii code in DL)
  3239                              <1> 	;	   ESI = user's buffer address
  3240                              <1> 	;
  3241                              <1> 	; Return:				
  3242                              <1>         ;	EAX = number of characters (ecx input)
  3243                              <1> 	;	EAX = 0 -> error
  3244                              <1> 	;	(EAX = 256 for BL = 0 and 1 if successful)
  3245                              <1> 	;	
  3246                              <1> 	; Note: system font overwrite permission will be
  3247                              <1> 	;       given if [multi_tasking] = 0 
  3248                              <1> 	;	and [u.uid] = 0 (BL = 1) ; 19/01/2021     	
  3249                              <1> 	;       and if [ufont] bit 7 is 1 (BL = 7,8,9)
  3250                              <1> 	;
  3251                              <1> 	; 18/01/2021
  3252                              <1> 	; SAVE/RESTORE STANDARD VGA VIDEO STATE
  3253                              <1> 	;
  3254                              <1> 	;	BH = 13 = Save/Restore std VGA video state
  3255                              <1> 	;
  3256                              <1> 	;	   BL = 0 : Save VGA state (without DAC regs)
  3257                              <1> 	;		Return: EAX = VideoStateID (>0)
  3258                              <1> 	;			EAX = 0 (failed!)
  3259                              <1> 	;	       (size: 110 bytes for TRDOS 386 v2.0.3)  
  3260                              <1> 	;	   BL = 1 : Restore VGA state (without DAC regs)
  3261                              <1> 	;		ECX = VideoStateID (to be verified)
  3262                              <1> 	;	        Return: EAX = Restore size (>0)
  3263                              <1> 	;	   BL = 2 : Save VGA state (complete)
  3264                              <1> 	;		Return: EAX = VideoStateID (>0)
  3265                              <1> 	;			EAX = 0 (failed!)
  3266                              <1> 	;	       (size: 882 bytes for TRDOS 386 v2.0.3) 
  3267                              <1> 	;	   BL = 3 : Restore VGA state (complete)
  3268                              <1> 	;		ECX = VideoStateID (to be verified)
  3269                              <1> 	;	        Return: EAX = Restore size (>0)
  3270                              <1> 	;
  3271                              <1> 	;	* Above options are for saving
  3272                              <1> 	;	*       video state to system memory
  3273                              <1> 	;	*	(location: VBE3VIDEOSTATE, 2048 bytes)
  3274                              <1> 	;	
  3275                              <1> 	;	   BL = 4 : Save VGA state (without DAC regs)
  3276                              <1> 	;		ECX = buffer address  
  3277                              <1> 	;		Return: EAX = transfer count
  3278                              <1> 	;	       (size: 110 bytes for TRDOS 386 v2.0.3)
  3279                              <1> 	;		ECX = buffer address  
  3280                              <1> 	;	   BL = 5 : Restore VGA state (without DAC regs)
  3281                              <1> 	;		ECX = buffer address  
  3282                              <1> 	;	        Return: EAX = transfer count
  3283                              <1> 	;	   BL = 6 : Save VGA state (complete)
  3284                              <1> 	;		ECX = buffer address  
  3285                              <1> 	;		Return: EAX = transfer count
  3286                              <1> 	;	       (size: 882 bytes for TRDOS 386 v2.0.3)
  3287                              <1> 	;	   BL = 7 : Restore VGA state (complete)
  3288                              <1> 	;		ECX = buffer address  
  3289                              <1> 	;	        Return: EAX = transfer count
  3290                              <1> 	;
  3291                              <1> 	;	* Above options are for saving
  3292                              <1> 	;	*       video state to user's buffer
  3293                              <1> 	;	*	(buffer size: 110 bytes or 882 bytes)
  3294                              <1> 	;
  3295                              <1> 	;	  BL > 7 : invalid (not implemented)
  3296                              <1> 	;
  3297                              <1> 	; 18/01/2021
  3298                              <1> 	; SAVE/RESTORE SUPER VGA (VESA VBE 2/3) VIDEO STATE
  3299                              <1> 	;
  3300                              <1> 	;	BH = 14 = Save/Restore SVGA video state
  3301                              <1> 	;
  3302                              <1> 	;	   BL = options
  3303                              <1> 	;		bit 0 - Save (0) or Restore (1)	
  3304                              <1> 	;		bit 1 - controller hardware state
  3305                              <1> 	;		bit 2 - BIOS data state
  3306                              <1> 	;		bit 3 - DAC state
  3307                              <1> 	;		bit 4 - (extended) Register state
  3308                              <1> 	;		bit 5 - system (0) or user (1) memory
  3309                              <1> 	;		bit 6 - verify without transfer
  3310                              <1> 	;		bit 7 - not used (must be 0)
  3311                              <1> 	;			
  3312                              <1> 	;	     if bit 0 = 0 and bit 5 = 0
  3313                              <1> 	;		Return:	EAX = VideoStateID (>0)	
  3314                              <1> 	;	     if bit 0 = 1		    			
  3315                              <1> 	;		ECX = VideoStateID (bit 5 = 0)
  3316                              <1> 	;		Return: EAX = restore (transfer) size
  3317                              <1> 	;	     if bit 5 = 1
  3318                              <1> 	;		ECX = Buffer address
  3319                              <1> 	;		Return: EAX = transfer count (size)
  3320                              <1> 	;
  3321                              <1> 	;	     ECX = Buffer address or VideoStateID
  3322                              <1> 	;
  3323                              <1> 	;	  BL > 127 : invalid (not implemented)
  3324                              <1> 	;
  3325                              <1> 	;  Note: Required buffer size may be > 2048 bytes
  3326                              <1> 	;	 (function fails when buff size > 2048 bytes)
  3327                              <1> 	;	 proper option must be used
  3328                              <1> 	;
  3329                              <1> 	; 18/01/2021
  3330                              <1> 	; READ VESA EDID (EXTENDED DISPLAY IDENTIFICATION DATA)
  3331                              <1> 	;
  3332                              <1> 	;	BH = 15 = Read VESA EDID for connected monitor  
  3333                              <1> 	;		  (copy EDID to user)	
  3334                              <1> 	;
  3335                              <1> 	;	   BL = any
  3336                              <1> 	;
  3337                              <1> 	;	Input:
  3338                              <1> 	;	    ECX = user's (EDID) buffer address 
  3339                              <1> 	;		 (buffer size: 128 bytes)
  3340                              <1> 	;	Output:
  3341                              <1> 	;	    EAX = 128 (EDID size)
  3342                              <1> 	;	    or EAX = 0 -> Error!
  3343                              <1> 	;	       (EDID not ready or buffer addr error)	
  3344                              <1> 	;
  3345                              <1>  	
  3346                              <1> 	; 16/05/2016
  3347 0000E2E2 31C0                <1> 	xor	eax, eax
  3348 0000E2E4 A3[64030300]        <1> 	mov	[u.r0], eax
  3349 0000E2E9 20FF                <1> 	and	bh, bh
  3350 0000E2EB 0F8586020000        <1> 	jnz	sysvideo_13 ; 11/07/2016
  3351                              <1> 
  3352                              <1> 	;; 21/11/2020 (TRDOS 386 v2.0.3)
  3353                              <1> 	;; tty/text mode transfers are only for video mode 3
  3354                              <1> 
  3355                              <1> 	; 22/11/2020
  3356                              <1> 	;cmp	byte [CRT_MODE], 3 ; 80x25 text, 16 colors
  3357                              <1> 	;jne	sysret ; invalid (nothing to do), [u.r0] = 0	
  3358                              <1> 	
  3359                              <1> 	; 23/11/2020
  3360                              <1> 	; bit 7,6,5,4 of BL are reserved and it must be 0
  3361                              <1> 	;	 	 for current 'sysvideo' version
  3362 0000E2F1 F6C3F0              <1> 	test	bl, 0F0h
  3363 0000E2F4 0F85F2F5FFFF        <1> 	jnz	sysret ; invalid (undefined) ! 
  3364                              <1> 
  3365                              <1> 	; Video mode 0, 80*25 text mode, CGA 16 colors  ; [CRT_MODE] = 3
  3366 0000E2FA 88DF                <1> 	mov	bh, bl
  3367 0000E2FC C0EF02              <1> 	shr	bh, 2 ; 4..7 -> 1, 8..11 -> 2, 12..15 -> 3
  3368                              <1> 	; 21/11/2020
  3369                              <1> 	;and	bh, bh
  3370 0000E2FF 0F8592000000        <1>         jnz	sysvideo_4  ; Display page window transfer etc.
  3371                              <1> 
  3372                              <1> 	; Display page (complete) transfer
  3373                              <1> 
  3374 0000E305 BF00800B00          <1> 	mov	edi, 0B8000h
  3375                              <1> 	; dl = display page number, destination
  3376 0000E30A 66B80010            <1> 	mov	ax, 4096 ; 21/11/2020
  3377 0000E30E 20D2                <1> 	and	dl, dl
  3378 0000E310 7413                <1> 	jz	short sysvideo_1
  3379 0000E312 80FA07              <1> 	cmp	dl, 7
  3380 0000E315 0F87D1F5FFFF        <1> 	ja	sysret ; invalid (nothing to do), [u.r0] = 0
  3381                              <1> sysvideo_0:
  3382                              <1> 	; page lenght = 4096 bytes (but page content is 80*25*2 bytes)
  3383 0000E31B 81C700100000        <1> 	add	edi, 4096 ; 21//11/2020 ([CRT_LEN] = 1000h for mode 3)
  3384 0000E321 FECA                <1> 	dec	dl
  3385 0000E323 75F6                <1> 	jnz	short sysvideo_0	
  3386                              <1> sysvideo_1:	
  3387 0000E325 80E303              <1> 	and	bl, 3
  3388 0000E328 752A                <1> 	jnz	short sysvideo_2 ; user to system display page transfer
  3389                              <1> 	; cl = display page number, source
  3390 0000E32A 80F907              <1> 	cmp	cl, 7
  3391 0000E32D 0F87B9F5FFFF        <1> 	ja	sysret ; invalid (nothing to do), [u.r0] = 0
  3392                              <1> 	; system to system video/display page transfer (mode 0)
  3393                              <1> 	; 21/11/2020
  3394                              <1> 	;mov	esi, 0B8000h
  3395                              <1> 	;movzx	eax, cl
  3396                              <1> 	;mov	edx, 4096 ; [CRT_LEN] = 1000h for video mode 3
  3397                              <1> 	;mov	ecx, edx
  3398                              <1> 	;mul	edx
  3399                              <1> 	;add	esi, eax
  3400 0000E333 0FB6F1              <1> 	movzx	esi, cl
  3401 0000E336 66C1E60C            <1> 	shl	si, 12 ; * 4096
  3402 0000E33A 81C600800B00        <1> 	add	esi, 0B8000h 
  3403                              <1> 
  3404                              <1> 	; 21/11/2020
  3405                              <1> 	;mov	ecx, 4096
  3406 0000E340 89C1                <1> 	mov	ecx, eax ; 4096
  3407                              <1> 	;mov	[u.r0], ecx ; 4096 bytes
  3408 0000E342 66890D[64030300]    <1> 	mov	[u.r0], cx
  3409                              <1> 
  3410 0000E349 66C1E902            <1> 	shr	cx, 2 ; / 4
  3411 0000E34D F3A5                <1> 	rep	movsd
  3412 0000E34F E998F5FFFF          <1> 	jmp	sysret	
  3413                              <1> sysvideo_2:  
  3414 0000E354 80FB02              <1> 	cmp	bl, 2
  3415 0000E357 0F878FF5FFFF        <1>         ja      sysret; invalid (user to user), [u.r0] = 0
  3416 0000E35D 721D                <1> 	jb	short sysvideo_3 ; user to system
  3417                              <1> 	; system to user video/display page transfer (mode 0)
  3418 0000E35F 89FE                <1> 	mov	esi, edi
  3419 0000E361 89CF                <1> 	mov	edi, ecx ; user buffer
  3420                              <1> 	; 21/11/2020
  3421 0000E363 89C1                <1> 	mov	ecx, eax ; 4096
  3422 0000E365 E85A2F0000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3423 0000E36A 0F827CF5FFFF        <1> 	jc	sysret ; [u.r0] = 0
  3424                              <1> 	; 21/11/2020
  3425                              <1> 	;mov	[u.r0], ecx
  3426 0000E370 66890D[64030300]    <1> 	mov	[u.r0], cx
  3427 0000E377 E970F5FFFF          <1> 	jmp	sysret	
  3428                              <1> sysvideo_3: 
  3429                              <1> 	; user to system video/display page transfer (mode 0)	
  3430 0000E37C 89CE                <1> 	mov	esi, ecx ; user buffer
  3431                              <1> 	; edi = video page address
  3432                              <1> 	; 21/11/2020
  3433 0000E37E 89C1                <1> 	mov	ecx, eax ; 4096
  3434 0000E380 E8892F0000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3435 0000E385 0F8261F5FFFF        <1> 	jc	sysret ; [u.r0] = 0
  3436                              <1> 	; 21/11/2020
  3437                              <1> 	;mov	[u.r0], ecx
  3438 0000E38B 66890D[64030300]    <1> 	mov	[u.r0], cx
  3439 0000E392 E955F5FFFF          <1> 	jmp	sysret
  3440                              <1> 
  3441                              <1> sysvideo_4:
  3442                              <1> 	; 23/11/2020 (TRDOS 386 v2.0.3)
  3443                              <1> 
  3444                              <1> 	; Display page window transfer etc.
  3445 0000E397 80E303              <1> 	and	bl, 3
  3446 0000E39A 0F85F7000000        <1>         jnz     sysvideo_9 ; user to system or system to user
  3447                              <1> 	; 21/11/2020
  3448                              <1> 	; system to system video/display page window transfer (mode 0)
  3449 0000E3A0 81FE00800B00        <1> 	cmp	esi, 0B8000h	; source buffer address (system)
  3450 0000E3A6 0F8240F5FFFF        <1> 	jb	sysret
  3451 0000E3AC 81FE00000C00        <1> 	cmp	esi, 0B8000h+(4096*8)
  3452 0000E3B2 0F8334F5FFFF        <1> 	jnb	sysret
  3453 0000E3B8 81FF00800B00        <1> 	cmp	edi, 0B8000h	; destination buffer address (system)	
  3454 0000E3BE 0F8228F5FFFF        <1> 	jb	sysret
  3455 0000E3C4 81FF00000C00        <1>         cmp     edi, 0B8000h+(4096*8)
  3456 0000E3CA 0F831CF5FFFF        <1> 	jnb	sysret
  3457                              <1> 	;
  3458 0000E3D0 51                  <1> 	push	ecx ; X1 and Y1 position - top left column, row
  3459 0000E3D1 0FB7C1              <1> 	movzx	eax, cx ; top left column
  3460                              <1> 	; 21/11/2020
  3461 0000E3D4 C1E910              <1> 	shr	ecx, 16 ; top row
  3462 0000E3D7 740E                <1> 	jz	short sysvideo_4_0 ; bypass following code
  3463 0000E3D9 52                  <1> 	push	edx ; X2 and Y2 position - bottom right column, row
  3464 0000E3DA 50                  <1> 	push	eax
  3465 0000E3DB 66B8A000            <1> 	mov	ax, 80*2 ; 80 colums, 160 bytes per row
  3466 0000E3DF F7E1                <1> 	mul	ecx
  3467                              <1> 		; eax = offset for start row number 
  3468 0000E3E1 01C6                <1> 	add	esi, eax
  3469 0000E3E3 01C7                <1> 	add	edi, eax
  3470 0000E3E5 58                  <1> 	pop	eax
  3471 0000E3E6 5A                  <1> 	pop	edx
  3472                              <1> sysvideo_4_0:
  3473 0000E3E7 66D1E0              <1> 	shl	ax, 1 ; * 2 ; convert start column number to offset
  3474 0000E3EA 7404                <1> 	jz	short sysvideo_4_1	
  3475 0000E3EC 01C6                <1> 	add	esi, eax
  3476 0000E3EE 01C7                <1> 	add	edi, eax
  3477                              <1> 		; esi = source page window start offset
  3478                              <1> 		; edi = destination page window start offset
  3479                              <1> sysvideo_4_1:
  3480 0000E3F0 59                  <1> 	pop	ecx
  3481                              <1> 	;mov	eax, 0B8000h+(80*25*2*8)
  3482                              <1> 	; 21/11/2020
  3483 0000E3F1 B800000C00          <1> 	mov	eax, 0B8000h+(4096*8)
  3484 0000E3F6 39C6                <1> 	cmp	esi, eax
  3485 0000E3F8 0F83EEF4FFFF        <1> 	jnb	sysret ; out of video page
  3486 0000E3FE 39C6                <1> 	cmp	esi, eax
  3487 0000E400 0F83E6F4FFFF        <1> 	jnb	sysret  ;out of video page	
  3488                              <1> 
  3489 0000E406 56                  <1> 	push	esi ; ****
  3490 0000E407 57                  <1> 	push	edi ; ***
  3491 0000E408 52                  <1> 	push	edx ; **
  3492 0000E409 51                  <1> 	push	ecx ; *
  3493 0000E40A C1E910              <1> 	shr	ecx, 16 ; top row
  3494 0000E40D C1EA10              <1> 	shr	edx, 16 ; bottom row
  3495                              <1> 	; 21/11/2020
  3496                              <1> 	;cmp	ecx, 24 ; max. 25 rows
  3497 0000E410 6683F918            <1> 	cmp	cx, 24
  3498 0000E414 7778                <1> 	ja	short sysvideo_6 ; invalid, [u.r0] = 0
  3499                              <1> 	;cmp	edx, 24 ; max. 25 rows
  3500 0000E416 6683FA18            <1> 	cmp	dx, 24
  3501 0000E41A 7772                <1> 	ja	short sysvideo_6 ; invalid, [u.r0] = 0		
  3502 0000E41C 28CA                <1> 	sub	dl, cl ; end >= start
  3503 0000E41E 726E                <1> 	jc	short sysvideo_6 ; invalid, [u.r0] = 0
  3504                              <1> 	; 21/11/2020
  3505 0000E420 89D3                <1> 	mov	ebx, edx ; row count - 1
  3506 0000E422 7415                <1> 	jz	short sysvideo_4_2
  3507 0000E424 50                  <1> 	push	eax ; *****
  3508 0000E425 B8A0000000          <1> 	mov	eax, 80*2 ; bytes per row
  3509 0000E42A F7E3                <1> 	mul	ebx ; 21/11/2020
  3510                              <1> 		; eax = window end offset 
  3511                              <1> 		; (for the last row, before adding column bytes)
  3512 0000E42C 01C6                <1> 	add	esi, eax
  3513 0000E42E 01C7                <1> 	add	edi, eax
  3514 0000E430 58                  <1> 	pop	eax ; ***** ; mode 3 video memory end (0C000h)
  3515 0000E431 39C6                <1> 	cmp	esi, eax
  3516                              <1> 	;ja	short sysvideo_6 ; invalid, [u.r0] = 0
  3517 0000E433 7359                <1> 	jnb	short sysvideo_6 ; 21/11/2020
  3518 0000E435 39C7                <1> 	cmp	edi, eax
  3519                              <1> 	;ja	short sysvideo_6 ; invalid, [u.r0] = 0
  3520 0000E437 7355                <1> 	jnb	short sysvideo_6 ; 21/11/2020
  3521                              <1> sysvideo_4_2:
  3522 0000E439 59                  <1> 	pop	ecx ; *
  3523 0000E43A 5A                  <1> 	pop	edx ; **
  3524 0000E43B 81E1FFFF0000        <1> 	and	ecx, 0FFFFh
  3525 0000E441 81E2FFFF0000        <1> 	and	edx, 0FFFFh
  3526                              <1> 	; 21/11/2020
  3527                              <1> 	;cmp	ecx, 79 ; max. 80 columns
  3528 0000E447 6683F94F            <1> 	cmp	cx, 79
  3529 0000E44B 7743                <1> 	ja	short sysvideo_7 ; invalid, [u.r0] = 0
  3530                              <1> 	;cmp	edx, 79 ; max. 80 columns
  3531 0000E44D 6683FA4F            <1> 	cmp	dx, 79 
  3532 0000E451 773D                <1> 	ja	short sysvideo_7 ; invalid, [u.r0] = 0
  3533 0000E453 28CA                <1> 	sub	dl, cl
  3534 0000E455 7639                <1> 	jna	short sysvideo_7 ; invalid, [u.r0] = 0
  3535                              <1> 	; 21/11/2020
  3536 0000E457 740E                <1> 	jz	short sysvideo_4_3 
  3537                              <1> 	; edx = column count (width) - 1
  3538 0000E459 D0E2                <1> 	shl	dl, 1 ; * 2 ; byte offset (in end row)
  3539 0000E45B 01D6                <1> 	add	esi, edx
  3540 0000E45D 01D7                <1> 	add	edi, edx
  3541                              <1> 		; esi = source page window end offset
  3542                              <1> 		; edi = destination page window end offset
  3543 0000E45F 39C6                <1> 	cmp	esi, eax ; video memory end
  3544                              <1> 	;ja	short sysvideo_7
  3545 0000E461 732D                <1> 	jnb	short sysvideo_7 ; 21/11/2020
  3546 0000E463 39C7                <1> 	cmp	edi, eax ; video memory end
  3547                              <1> 	;ja	short sysvideo_7
  3548 0000E465 7329                <1> 	jnb	short sysvideo_7 ; 21/11/2020
  3549                              <1> sysvideo_4_3:
  3550 0000E467 5F                  <1> 	pop	edi ; ***
  3551 0000E468 5E                  <1> 	pop	esi ; ****
  3552 0000E469 FEC3                <1> 	inc	bl ; row count - 1 -> row count	
  3553 0000E46B FEC2                <1> 	inc	dl ; column count
  3554 0000E46D 88D7                <1> 	mov	bh, dl
  3555 0000E46F D0E2                <1> 	shl	dl, 1 ; convert column count to byte offset
  3556                              <1> 	; 21/11/2020
  3557                              <1> 	; esi = source page window start offset
  3558                              <1> 	; edi = destination page window start offset
  3559 0000E471 B8A0000000          <1> 	mov	eax, 80*2 ; bytes per row
  3560                              <1> 	; Note: 160 bytes per row (even if move count < 160)
  3561                              <1> sysvideo_5:	
  3562 0000E476 88F9                <1> 	mov	cl, bh ; move/transfer -word- count per row
  3563 0000E478 0115[64030300]      <1> 	add	[u.r0], edx ; transfer count in bytes
  3564 0000E47E F366A5              <1> 	rep	movsw
  3565 0000E481 01C6                <1> 	add	esi, eax ; + 160 bytes to next row
  3566 0000E483 01C7                <1> 	add	edi, eax ; + 160 bytes to next row
  3567 0000E485 FECB                <1> 	dec	bl ; remain count of rows
  3568 0000E487 75ED                <1> 	jnz	short sysvideo_5
  3569 0000E489 E95EF4FFFF          <1> 	jmp	sysret
  3570                              <1> 
  3571                              <1> sysvideo_6:
  3572 0000E48E 59                  <1> 	pop	ecx ; *
  3573 0000E48F 5A                  <1> 	pop	edx ; **
  3574                              <1> sysvideo_7:	
  3575 0000E490 5F                  <1> 	pop	edi ; ***
  3576 0000E491 5E                  <1> 	pop	esi ; ****
  3577                              <1> sysvideo_8:
  3578 0000E492 E955F4FFFF          <1> 	jmp	sysret
  3579                              <1> 
  3580                              <1> sysvideo_9:
  3581                              <1> 	; user to system or system to user window transfer
  3582 0000E497 80FB02              <1> 	cmp	bl, 2
  3583                              <1> 	;ja	sysret	; user to user transfer is invalid
  3584                              <1> 			; [u.r0] = 0
  3585 0000E49A 77F6                <1> 	ja	short sysvideo_8 ; 26/12/2020
  3586                              <1> 
  3587 0000E49C 56                  <1> 	push	esi ; ****
  3588 0000E49D 57                  <1> 	push	edi ; ***
  3589 0000E49E 52                  <1> 	push	edx ; **
  3590 0000E49F 51                  <1> 	push	ecx ; *
  3591                              <1> 
  3592 0000E4A0 C1E910              <1> 	shr	ecx, 16 ; top row
  3593 0000E4A3 C1EA10              <1> 	shr	edx, 16 ; bottom row
  3594                              <1> 	
  3595                              <1> 	; 21/11/2020
  3596                              <1> 	;cmp	ecx, 24 ; max. 25 rows
  3597 0000E4A6 6683F918            <1> 	cmp	cx, 24
  3598 0000E4AA 77E2                <1> 	ja	short sysvideo_6 ; invalid, [u.r0] = 0
  3599                              <1> 	;cmp	edx, 24 ; max. 25 rows
  3600 0000E4AC 6683FA18            <1> 	cmp	dx, 24
  3601 0000E4B0 77DC                <1> 	ja	short sysvideo_6 ; invalid, [u.r0] = 0	
  3602 0000E4B2 28CA                <1> 	sub	dl, cl
  3603 0000E4B4 72D8                <1> 	jc	short sysvideo_6 ; invalid, [u.r0] = 0
  3604                              <1> 
  3605                              <1> 	;mov	ch, cl ; top row
  3606                              <1> 	;mov	cl, [ACTIVE_PAGE]
  3607                              <1> 
  3608                              <1> 	;mov	edi, 80*25*2 ; 4000
  3609                              <1> 	; 21/11/2020
  3610                              <1> 	;mov	edi, 4096 ; [CRT_LEN = 4096 for video mode 3 
  3611                              <1> 	;shl	edi, cl  ; ! wrong for page 2 to page 7 !
  3612                              <1> 	;;add	edi, 0B8000h - 80*25*2
  3613                              <1> 	;add	edi, 0B8000h - 1000h ; - 4096
  3614                              <1> 	
  3615                              <1> 	; 21/11/2020
  3616                              <1> 	;xor	eax, eax
  3617                              <1> 	;mov	edi, 0B8000h
  3618                              <1> 	;and	cl, cl ; is video page = 0 ?
  3619                              <1> 	;jz	short sysvideo_9_1 ; yes
  3620                              <1> 	; eax = 0
  3621                              <1> 
  3622                              <1> ;sysvideo_9_0:
  3623                              <1> 	;add	ax, 4096
  3624                              <1> 	;dec	cl
  3625                              <1> 	;jnz	short sysvideo_9_0
  3626                              <1> 	;add	edi, eax
  3627                              <1> 	;	; edi = video page start address
  3628                              <1> 
  3629                              <1> 	; 21/11/2020
  3630 0000E4B6 BF00800B00          <1> 	mov	edi, 0B8000h
  3631 0000E4BB 803D[BE810100]00    <1> 	cmp	byte [ACTIVE_PAGE], 0
  3632 0000E4C2 760C                <1> 	jna	short sysvideo_9_1
  3633                              <1> stsvideo_9_0:
  3634 0000E4C4 B010                <1> 	mov	al, 16 ; 4096/256
  3635 0000E4C6 F625[BE810100]      <1> 	mul	byte [ACTIVE_PAGE] 
  3636 0000E4CC 86E0                <1> 	xchg	ah, al ; * 256
  3637 0000E4CE 01C7                <1> 	add	edi, eax
  3638                              <1> 		; edi = video page start address
  3639                              <1> sysvideo_9_1:
  3640                              <1> 	; bl = transfer direction 
  3641                              <1> 	;     ( 1 = from user, 2 = to user)
  3642 0000E4D0 88D7                <1> 	mov	bh, dl ; row count - 1
  3643                              <1> 	;mov	dl, ch ; top row
  3644                              <1> 	; 21/11/2020
  3645 0000E4D2 08C9                <1> 	or	cl, cl ; top row number
  3646 0000E4D4 7408                <1> 	jz	short sysvideo_9_2
  3647                              <1> 
  3648                              <1> 	;mov	eax, 80*2
  3649 0000E4D6 66B8A000            <1> 	mov	ax, 80*2 ; 160, bytes per row
  3650 0000E4DA F7E1                <1> 	mul	ecx ; 22/11/2020
  3651 0000E4DC 01C7                <1> 	add	edi, eax
  3652                              <1> 		; edi = window start address for top row
  3653                              <1> sysvideo_9_2:
  3654 0000E4DE 59                  <1> 	pop	ecx ; *
  3655 0000E4DF 5A                  <1> 	pop	edx ; **
  3656 0000E4E0 81E1FFFF0000        <1> 	and	ecx, 0FFFFh
  3657 0000E4E6 81E2FFFF0000        <1> 	and	edx, 0FFFFh
  3658                              <1> 	; 21/11/2020
  3659                              <1> 	;cmp	ecx, 79 ; max. 80 columns
  3660 0000E4EC 6683F94F            <1> 	cmp	cx, 79
  3661 0000E4F0 779E                <1> 	ja	short sysvideo_7 ; invalid, [u.r0] = 0
  3662                              <1> 	;cmp	edx, 79 ; max. 80 columns
  3663 0000E4F2 6683FA4F            <1> 	cmp	dx, 79
  3664 0000E4F6 7798                <1> 	ja	short sysvideo_7 ; invalid, [u.r0] = 0
  3665                              <1> 	
  3666 0000E4F8 28CA                <1> 	sub	dl, cl
  3667 0000E4FA 7294                <1> 	jc	short sysvideo_7 ; invalid, [u.r0] = 0
  3668                              <1> 	
  3669 0000E4FC 08C9                <1> 	or	cl, cl ; left column 
  3670 0000E4FE 7404                <1> 	jz	short sysvideo_9_3 ; 0
  3671                              <1> 
  3672                              <1> 	; 21/11/2020
  3673 0000E500 D0E1                <1> 	shl	cl, 1  ; column * 2
  3674 0000E502 01CF                <1> 	add	edi, ecx
  3675                              <1> 		; edi = window start addr for top left column
  3676                              <1> sysvideo_9_3:
  3677 0000E504 88D1                <1> 	mov	cl, dl
  3678 0000E506 FEC1                <1> 	inc	cl ; column count
  3679 0000E508 D0E1                <1> 	shl	cl, 1 ; column count * 2
  3680                              <1> 		; ecx = tranfer count per row
  3681                              <1> 
  3682 0000E50A 58                  <1> 	pop	eax ; *** (swap address)
  3683 0000E50B 5E                  <1> 	pop	esi ; ****
  3684                              <1> 
  3685 0000E50C FEC7                <1> 	inc	bh  ; row count	
  3686                              <1> 	
  3687                              <1> 	;mov	edx, 80*2
  3688 0000E50E B2A0                <1> 	mov	dl, 80*2  ; bytes per row
  3689                              <1> 	;
  3690 0000E510 80FB01              <1> 	cmp	bl, 1 ; transfer direction
  3691 0000E513 7742                <1> 	ja	short sysvideo_11 ; system to user transfer
  3692                              <1> 
  3693                              <1> 	; user to system video/display page window transfer (mode 0)	
  3694 0000E515 21C0                <1> 	and	eax, eax ; swap address
  3695 0000E517 7420                <1> 	jz	short sysvideo_10 ; no window swap
  3696                              <1> 	; save previous window content in user's buffer (swap address)
  3697 0000E519 56                  <1> 	push	esi ; user buffer
  3698 0000E51A 57                  <1> 	push	edi ; beginning address of the window
  3699                              <1> 	; 21/11/2020
  3700 0000E51B 53                  <1> 	push	ebx ; save bh
  3701 0000E51C 89FE                <1> 	mov	esi, edi
  3702 0000E51E 89C7                <1> 	mov	edi, eax
  3703                              <1> sysvideo_9_4:
  3704 0000E520 E89F2D0000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3705 0000E525 7208                <1> 	jc	short sysvideo_9_5
  3706                              <1> 	; ecx = actual transfer count (must be same with input)
  3707 0000E527 01D6                <1> 	add	esi, edx ; next row address of (video page) window 
  3708 0000E529 01CF                <1> 	add	edi, ecx ; next row address of user's window
  3709                              <1> 		; Note: ecx may be less than row length of video page
  3710                              <1> 		; user's window uses offset according to window width
  3711 0000E52B FECF                <1> 	dec	bh
  3712 0000E52D 75F1                <1> 	jnz	short sysvideo_9_4 ; repeat for next row
  3713                              <1> sysvideo_9_5:
  3714 0000E52F 5B                  <1> 	pop	ebx ; restore bh
  3715 0000E530 5F                  <1> 	pop	edi
  3716 0000E531 5E                  <1> 	pop	esi
  3717 0000E532 7305                <1> 	jnc	short sysvideo_10
  3718 0000E534 E9B3F3FFFF          <1> 	jmp	sysret ; [u.r0] = 0
  3719                              <1> sysvideo_10: 
  3720                              <1> 	; user to system video/display page window transfer (mode 0)	
  3721                              <1> 	; esi =	user buffer
  3722 0000E539 E8D02D0000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3723 0000E53E 0F82A8F3FFFF        <1> 	jc	sysret
  3724                              <1> 	; ecx = actual transfer count (must be same with input)
  3725 0000E544 010D[64030300]      <1> 	add	[u.r0], ecx ; actual transfer count
  3726 0000E54A 01D7                <1> 	add	edi, edx ; next row address of (ivdeo page) window 
  3727 0000E54C 01CE                <1> 	add	esi, ecx ; next row address of user's window
  3728                              <1> 		; Note: ecx may be less than row length of video page
  3729                              <1> 		; user's window uses offset according to window width
  3730 0000E54E FECF                <1> 	dec	bh
  3731 0000E550 75E7                <1> 	jnz	short sysvideo_10 ; repeat for next row
  3732 0000E552 E995F3FFFF          <1> 	jmp	sysret
  3733                              <1> 	
  3734                              <1> sysvideo_11:
  3735                              <1> 	; system to user video/display page window transfer (mode 0)
  3736 0000E557 87FE                <1> 	xchg	edi, esi
  3737                              <1> sysvideo_12:
  3738                              <1> 	; esi = beginning addr of the (screen, video page) window
  3739                              <1> 	; edi =	user's buffer	
  3740 0000E559 E8662D0000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3741 0000E55E 0F8288F3FFFF        <1> 	jc	sysret
  3742                              <1> 	; ecx = actual transfer count (must be same with input)
  3743 0000E564 010D[64030300]      <1> 	add	[u.r0], ecx
  3744 0000E56A 01D6                <1> 	add	esi, edx ; next row (edx = 160)
  3745 0000E56C 01CF                <1> 	add	edi, ecx ; next row of the user's window 
  3746                              <1> 			 ; (ecx <= 160)
  3747 0000E56E FECF                <1> 	dec	bh
  3748 0000E570 75E7                <1> 	jnz	short sysvideo_12
  3749                              <1> sysvideo_12_0:
  3750 0000E572 E975F3FFFF          <1> 	jmp	sysret
  3751                              <1> 
  3752                              <1> sysvideo_13:
  3753                              <1> 	; 28/12/2020
  3754 0000E577 80FF01              <1> 	cmp	bh, 1
  3755 0000E57A 7733                <1>         ja      short sysvideo_15 ; 23/11/2020
  3756                              <1> 
  3757                              <1> 	;cmp	bl, 13
  3758                              <1> 	; 02/01/2021
  3759 0000E57C 80FB0F              <1> 	cmp	bl, 15
  3760 0000E57F 77F1                <1> 	ja	short sysvideo_12_0 ; invalid (unknown) sub function
  3761                              <1> 
  3762                              <1> 	; 23/11/2020 (TRDOS 386 v2.0.3)
  3763                              <1> 	; (major modification, from mode 13h to all VGA modes,
  3764                              <1> 	;  except super VGA modes and liner frame buffer method)
  3765                              <1> 
  3766                              <1> 	; BH = 1 = VGA Graphics mode (0A0000h) data transfers
  3767                              <1> 
  3768                              <1> 	; 23/11/2020
  3769                              <1> 	; screen width will be saved into EBP register
  3770                              <1> 
  3771 0000E581 88DC                <1> 	mov	ah, bl
  3772                              <1> 	;and	bl, 0Fh	
  3773 0000E583 C0EC04              <1> 	shr	ah, 4
  3774 0000E586 BD40010000          <1> 	mov	ebp, 320 ; 320*200, 320*240
  3775 0000E58B 20E4                <1> 	and	ah, ah
  3776                              <1> 	;jz	short sysvideo_13_0
  3777 0000E58D 740E                <1> 	jz	short sysvideo_14 ; 28/12/2020
  3778 0000E58F D1E5                <1> 	shl	ebp, 1 ; 640*200, 640*400, 640*480
  3779 0000E591 80FC02              <1> 	cmp	ah, 2
  3780                              <1> 	;jb	short sysvideo_13_0		
  3781 0000E594 7207                <1> 	jb	short sysvideo_14 ; 28/12/2020
  3782                              <1> 	;;ja	sysret ; invalid
  3783 0000E596 77DA                <1> 	ja	short sysvideo_12_0 ; 26/12/2020
  3784                              <1> 	; 800*600
  3785 0000E598 6681C5A000          <1> 	add	bp, 160 ; 800
  3786                              <1> 
  3787                              <1> ;sysvideo_13_0:
  3788                              <1> sysvideo_14:
  3789                              <1> 	; 28/12/2020
  3790                              <1> 	; ebp = screen width (320, 640, 800)
  3791 0000E59D B800000A00          <1> 	mov	eax, 0A0000h ; Video memory
  3792 0000E5A2 50                  <1>  	push	eax ; * ; save linear frame buffer address
  3793 0000E5A3 B800000100          <1> 	mov	eax, 65536   ; video memory size
  3794 0000E5A8 B708                <1> 	mov	bh, 8  ; 02/01/2020
  3795 0000E5AA E992000000          <1> 	jmp	sysvideo_15_6_0
  3796                              <1> 
  3797                              <1> sysvideo_15:
  3798                              <1> 	; 28/12/2020
  3799                              <1> 
  3800 0000E5AF 80FF02              <1> 	cmp	bh, 2
  3801 0000E5B2 0F87B8160000        <1>         ja      sysvideo_16
  3802                              <1> 
  3803                              <1> 	; 01/01/2021
  3804                              <1> 	; 27/12/2020
  3805                              <1> 	; 26/12/2020
  3806                              <1> 	; 25/12/2020 (TRDOS 386 v2.0.3)
  3807                              <1> 	;
  3808                              <1> 	; BH = 2 = SVGA (VESA VBE) Graphics mode (LFB) data transfers
  3809                              <1> 
  3810                              <1> 	; 25/12/2020
  3811                              <1> 	; resolution table entry will be saved into EBP register
  3812                              <1> 
  3813                              <1> 	;cmp	bl, 13
  3814                              <1> 	; 01/01/2021
  3815 0000E5B8 80FB0F              <1> 	cmp	bl, 15 ; cmp bl,0Fh
  3816 0000E5BB 77B5                <1> 	ja	short sysvideo_12_0 ; invalid (unknown) sub function
  3817                              <1> 
  3818 0000E5BD 803D[54090000]02    <1> 	cmp	byte [vbe3], 2 ; VESA VBE 3 video bios 
  3819                              <1> 			  ; or BOCHS/QEMU/VIRTUALBOX emu video bios
  3820 0000E5C4 7243                <1> 	jb	short sysvideo_15_4 ; no, nothing to do !
  3821 0000E5C6 770B                <1> 	ja	short sysvideo_15_0 ; yes
  3822                              <1> 
  3823                              <1> 	; Only Bochs/Plex86 (emu) vbe2 video bios is usable in pmid
  3824                              <1> 	; (if [vbe3] = 2) 
  3825 0000E5C8 A0[55090000]        <1> 	mov	al, [vbe2bios] ; Bochs vbios sign is from C0h to C5h
  3826 0000E5CD 24F0                <1> 	and	al, 0F0h
  3827 0000E5CF 3CC0                <1> 	cmp	al, 0C0h
  3828 0000E5D1 7536                <1> 	jne	short sysvideo_15_4 ; unknown (vbe2) video bios
  3829                              <1> sysvideo_15_0:
  3830                              <1> 	; 01/01/2021
  3831 0000E5D3 80FB0E              <1> 	cmp	bl, 14
  3832 0000E5D6 7307                <1> 	jnb	short sysvideo_15_0_0
  3833                              <1> 	;
  3834 0000E5D8 89D8                <1> 	mov	eax, ebx ; hw of ebx is vesa vbe video mode
  3835 0000E5DA C1E810              <1> 	shr	eax, 16 ; ax = vesa vbe video mode
  3836 0000E5DD 7513                <1> 	jnz	short sysvideo_15_2 
  3837                              <1> 	; ax = 0
  3838                              <1> sysvideo_15_0_0:
  3839                              <1> 	; check & use current video mode
  3840 0000E5DF 803D[BA6F0000]FF    <1> 	cmp	byte [CRT_MODE], 0FFh ; extended (SVGA) mode ?
  3841 0000E5E6 7521                <1> 	jne	short sysvideo_15_4 ; no
  3842                              <1> sysvideo_15_1:
  3843                              <1> 	; use current vbe (svga) video mode
  3844 0000E5E8 66A1[1E120300]      <1> 	mov	ax, [video_mode] ; extended (SVGA, VESA VBE) mode
  3845 0000E5EE 6625FF01            <1> 	and	ax, 1FFh ; vesa vbe video mode: 1XXh
  3846                              <1> sysvideo_15_2:
  3847 0000E5F2 56                  <1> 	push	esi
  3848 0000E5F3 BE[46730000]        <1> 	mov	esi, b_vbe_modes ; vbe mode table (in 'vidata.s')
  3849                              <1> sysvideo_15_3:
  3850 0000E5F8 663B06              <1> 	cmp	ax, [esi]
  3851 0000E5FB 7411                <1> 	je	short sysvideo_15_5
  3852 0000E5FD 83C608              <1> 	add	esi, 8 ; vbe mode table entry size
  3853 0000E600 81FE[06740000]      <1> 	cmp	esi, end_of_b_vbe_modes
  3854 0000E606 72F0                <1>  	jb	short sysvideo_15_3	
  3855 0000E608 5E                  <1> 	pop	esi
  3856                              <1> sysvideo_15_4:
  3857                              <1> 	; desired video mode is not a valid (implemented)
  3858                              <1> 	;	  extended (VESA VBE, SVGA) video mode
  3859                              <1> 	;
  3860                              <1> 	; nothing to do !
  3861                              <1> 
  3862                              <1>  	; [u.r0] = 0  ; return value of EAX
  3863 0000E609 E9DEF2FFFF          <1>  	jmp	sysret
  3864                              <1> 
  3865                              <1> sysvideo_15_5:
  3866 0000E60E 89F5                <1> 	mov	ebp, esi
  3867                              <1> 		
  3868 0000E610 5E                  <1> 	pop	esi
  3869                              <1> 	
  3870                              <1> 	; get LFB address
  3871 0000E611 A1[2C120300]        <1> 	mov	eax, [LFB_ADDR] ; [LFB_Info+LFBINFO.LFB_addr]
  3872 0000E616 09C0                <1> 	or	eax, eax
  3873 0000E618 7509                <1> 	jnz	short sysvideo_15_6
  3874 0000E61A 66A1[E30E0000]      <1> 	mov	ax, [def_LFB_addr] ; default LFB addr 
  3875                              <1> 				   ; (for vbe mode 118h)
  3876 0000E620 C1E010              <1> 	shl	eax, 16
  3877                              <1> 	; 27/12/2020
  3878                              <1> 	;jz	short sysvideo_15_4
  3879                              <1> sysvideo_15_6:
  3880 0000E623 50                  <1> 	push	eax ; * ; save linear frame buffer address
  3881                              <1> 
  3882                              <1> 	; 27/12/2020
  3883                              <1> 	; 26/12/2020
  3884 0000E624 8B4502              <1> 	mov	eax, [ebp+2] ; width, height
  3885                              <1> 	; 28/12/2020
  3886 0000E627 8A7D06              <1> 	mov	bh, byte [ebp+6] ; bpp
  3887 0000E62A 0FB7E8              <1> 	movzx	ebp, ax	; width 
  3888                              <1> 
  3889 0000E62D 52                  <1> 	push	edx ; ***
  3890 0000E62E 0FB7D0              <1> 	movzx	edx, ax  ; width
  3891 0000E631 C1E810              <1> 	shr	eax, 16  ; height
  3892 0000E634 F7E2                <1> 	mul	edx
  3893                              <1> 	; eax = linear frame buffer size (pixels)
  3894 0000E636 5A                  <1> 	pop	edx ; ***
  3895                              <1> 	;mov	bh, byte [ebp+6] ; bpp
  3896                              <1> 
  3897 0000E637 80FF08              <1> 	cmp	bh, 8
  3898 0000E63A 7405                <1> 	je	short sysvideo_15_6_0
  3899                              <1> 
  3900 0000E63C E935020000          <1> 	jmp	sysvideo_15_39 ; 16, 24, 32 bpp
  3901                              <1> 
  3902                              <1> sysvideo_15_6_0:
  3903                              <1> 	; eax = linear frame buffer (VIDEO PAGE) size
  3904                              <1> 	; bh = bits per pixel (bpp) = 8
  3905                              <1> 
  3906 0000E641 08DB                <1> 	or	bl, bl
  3907 0000E643 750E                <1> 	jnz	short sysvideo_15_7
  3908                              <1> 	
  3909 0000E645 5F                  <1> 	pop	edi ; * ; LFB address
  3910                              <1> 
  3911 0000E646 A3[64030300]        <1> 	mov	[u.r0], eax
  3912                              <1> 
  3913                              <1> 	; BL = 0 = Fill color (color in CL)
  3914 0000E64B 91                  <1> 	xchg	eax, ecx ; al = color, ecx = byte count
  3915                              <1> 
  3916                              <1> 	; 8 bit pixels
  3917 0000E64C F3AA                <1> 	rep	stosb
  3918                              <1> sysvideo_15_6_1:
  3919                              <1> 	; [u.r0] = transfer (fill) count in bytes
  3920 0000E64E E999F2FFFF          <1> 	jmp	sysret
  3921                              <1> 
  3922                              <1> sysvideo_15_7:
  3923                              <1> 	; eax = linear frame buffer (VIDEO PAGE) size
  3924                              <1> 
  3925 0000E653 80FB02              <1> 	cmp	bl, 2	
  3926 0000E656 7725                <1> 	ja	short sysvideo_15_10
  3927 0000E658 7217                <1> 	jb	short sysvideo_15_9
  3928                              <1> 
  3929                              <1> 	; BL = 2 = system to user video/display page transfer
  3930 0000E65A 5E                  <1> 	pop	esi ; * ; LFB address
  3931 0000E65B 89CF                <1> 	mov	edi, ecx ; user's buffer
  3932                              <1> sysvideo_15_7_0:
  3933 0000E65D 89C1                <1> 	mov	ecx, eax ; LFB video page size (< LFB size)
  3934 0000E65F E8602C0000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3935                              <1> sysvideo_15_8:
  3936                              <1> 	;jc	sysret ; [u.r0] = 0
  3937 0000E664 72E8                <1> 	jc	short sysvideo_15_6_1
  3938 0000E666 890D[64030300]      <1> 	mov	[u.r0], ecx ; actual transfer count		
  3939 0000E66C E97BF2FFFF          <1> 	jmp	sysret
  3940                              <1> 
  3941                              <1> sysvideo_15_9:
  3942                              <1> 	; BL = 1 = user to system video/display page transfer
  3943 0000E671 5F                  <1> 	pop	edi ; * ; LFB address
  3944 0000E672 89CE                <1> 	mov	esi, ecx ; user's buffer
  3945                              <1> sysvideo_15_9_0:
  3946 0000E674 89C1                <1> 	mov	ecx, eax ; LFB video page size (< LFB size)
  3947 0000E676 E8932C0000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3948 0000E67B EBE7                <1> 	jmp	short sysvideo_15_8
  3949                              <1> 
  3950                              <1> sysvideo_15_10:
  3951 0000E67D 80FB03              <1> 	cmp	bl, 3
  3952 0000E680 7762                <1> 	ja	short sysvideo_15_16
  3953                              <1> 
  3954                              <1> 	; BL = 3 = NOT bits in window (ECX, EDX)
  3955 0000E682 5E                  <1> 	pop	esi ; * ; LFB address
  3956                              <1> 
  3957 0000E683 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3958 0000E685 7318                <1> 	jnb	short sysvideo_15_12 ; window
  3959                              <1> 
  3960 0000E687 09D2                <1> 	or	edx, edx
  3961 0000E689 7554                <1> 	jnz	short sysvideo_15_15  ; invalid !
  3962                              <1> 
  3963                              <1> 	; full screen (update) ; edx = 0, ecx > 0
  3964 0000E68B 89C1                <1> 	mov	ecx, eax ; LFB page size (byte count)
  3965 0000E68D C1E902              <1> 	shr	ecx, 2  ; dword 'NOT'
  3966 0000E690 A3[64030300]        <1> 	mov	[u.r0], eax
  3967                              <1> sysvideo_15_11:
  3968 0000E695 F716                <1> 	not	dword [esi]
  3969 0000E697 AD                  <1> 	lodsd	; add esi, 4
  3970 0000E698 E2FB                <1> 	loop	sysvideo_15_11
  3971 0000E69A E94DF2FFFF          <1> 	jmp	sysret
  3972                              <1> 
  3973                              <1> sysvideo_15_12:
  3974                              <1> 	; 29/12/2020
  3975                              <1> 	; fix dx to bp-1 if dx >= bp
  3976 0000E69F E885140000          <1> 	call	sysvideo_15_200
  3977                              <1> 	;
  3978                              <1> 	; 29/12/2020	
  3979 0000E6A4 89F7                <1> 	mov	edi, esi
  3980 0000E6A6 01C7                <1> 	add	edi, eax ; end byte of video page + 1
  3981 0000E6A8 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3982 0000E6AB 6629C8              <1> 	sub	ax, cx  ; - top left column
  3983 0000E6AE 722F                <1>         jb      short sysvideo_15_15 ; invalid
  3984 0000E6B0 40                  <1> 	inc	eax ; same column no == 1 column	 
  3985 0000E6B1 50                  <1> 	push	eax ; byte count per window row
  3986 0000E6B2 52                  <1> 	push	edx
  3987                              <1> 	;;movzx	ebx, word [ebp+2] ; screen width
  3988                              <1> 	;; 28/12/2020
  3989                              <1> 	;mov	ebx, ebp ; screen width
  3990                              <1> 	;mov	eax, ecx
  3991                              <1> 	;shr	eax, 16	; top row
  3992                              <1> 	;mul	ebx
  3993                              <1> 	;mov	dx, cx ; top left column
  3994                              <1> 	;add	eax, edx
  3995                              <1> 	; 30/12/2020
  3996                              <1> 	; calculate start offset
  3997 0000E6B3 E87C140000          <1> 	call	sysvideo_15_202
  3998 0000E6B8 01C6                <1> 	add	esi, eax ; start address 
  3999 0000E6BA 59                  <1> 	pop	ecx ; edx
  4000                              <1> 	;mov	eax, ecx
  4001                              <1> 	;shr	eax, 16 ; bottom row  ; zero based
  4002                              <1> 	;mul	ebx
  4003                              <1> 	;mov	dx, cx ; bottom right column ; 0 based
  4004                              <1> 	;add	eax, edx
  4005                              <1> 	; 30/12/2020
  4006                              <1> 	; calculate start offset
  4007 0000E6BB E876140000          <1> 	call	sysvideo_15_203
  4008 0000E6C0 5A                  <1> 	pop	edx ; byte count per window row
  4009                              <1> 	; eax = the last byte to be converted 
  4010 0000E6C1 01F0                <1> 	add	eax, esi
  4011 0000E6C3 39C7                <1> 	cmp	edi, eax
  4012 0000E6C5 7618                <1> 	jna	short sysvideo_15_15 ; out of video page
  4013 0000E6C7 89C7                <1> 	mov	edi, eax ; stop address
  4014 0000E6C9 29D3                <1> 	sub	ebx, edx ; screen width - window width
  4015 0000E6CB 4E                  <1> 	dec	esi 
  4016                              <1> sysvideo_15_13:
  4017 0000E6CC 89D1                <1> 	mov	ecx, edx ; window width (pixel count)
  4018                              <1> sysvideo_15_14:
  4019 0000E6CE 46                  <1> 	inc	esi
  4020 0000E6CF F616                <1> 	not	byte [esi]
  4021 0000E6D1 E2FB                <1> 	loop	sysvideo_15_14
  4022 0000E6D3 0115[64030300]      <1> 	add	[u.r0], edx
  4023 0000E6D9 01DE                <1> 	add	esi, ebx ; add difference for next row
  4024                              <1> 	;
  4025 0000E6DB 39FE                <1> 	cmp	esi, edi ; stop address (included in loop)
  4026 0000E6DD 76ED                <1> 	jna	short sysvideo_15_13
  4027                              <1> 	;jb	short sysvideo_15_13
  4028                              <1> sysvideo_15_15:
  4029 0000E6DF E908F2FFFF          <1> 	jmp	sysret	
  4030                              <1> 
  4031                              <1> sysvideo_15_16:
  4032 0000E6E4 80FB04              <1> 	cmp	bl, 4
  4033 0000E6E7 7771                <1>         ja	short sysvideo_15_20
  4034                              <1> 
  4035                              <1> 	; BL = 4 = window copy (system to system)
  4036                              <1> 
  4037                              <1> 	; eax = LFB page size in bytes
  4038                              <1> 
  4039 0000E6E9 5B                  <1> 	pop	ebx ; * ; LFB address
  4040                              <1> 
  4041 0000E6EA 39DE                <1> 	cmp	esi, ebx
  4042 0000E6EC 72F1                <1> 	jb	short sysvideo_15_15
  4043                              <1> 
  4044 0000E6EE 39DF                <1> 	cmp	edi, ebx
  4045 0000E6F0 72ED                <1> 	jb	short sysvideo_15_15
  4046 0000E6F2 01C3                <1> 	add	ebx, eax ; **
  4047 0000E6F4 39DE                <1> 	cmp	esi, ebx
  4048 0000E6F6 73E7                <1> 	jnb	short sysvideo_15_15
  4049 0000E6F8 39DF                <1> 	cmp	edi, ebx
  4050 0000E6FA 73E3                <1> 	jnb	short sysvideo_15_15
  4051                              <1> 	
  4052 0000E6FC 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  4053 0000E6FE 7312                <1> 	jnb	short sysvideo_15_17 ; window
  4054                              <1> 
  4055 0000E700 09D2                <1> 	or	edx, edx
  4056 0000E702 75DB                <1> 	jnz	short sysvideo_15_15 ; invalid !
  4057                              <1> 
  4058 0000E704 A3[64030300]        <1> 	mov	[u.r0], eax
  4059 0000E709 89C1                <1> 	mov	ecx, eax ; pixel (byte) count
  4060                              <1> 	; full screen copy ; edx = 0, ecx > 0
  4061 0000E70B F3A4                <1> 	rep	movsb
  4062 0000E70D E9DAF1FFFF          <1> 	jmp	sysret
  4063                              <1> sysvideo_15_17:
  4064                              <1> 	; 29/12/2020
  4065                              <1> 	; fix dx to bp-1 if dx >= bp
  4066 0000E712 E812140000          <1> 	call	sysvideo_15_200
  4067                              <1> 	;
  4068                              <1> 	; 29/12/2020
  4069 0000E717 6639CA              <1> 	cmp	dx, cx
  4070 0000E71A 72C3                <1> 	jb	short sysvideo_15_15 ; invalid
  4071                              <1> 
  4072 0000E71C 53                  <1> 	push	ebx ; the last byte of LFB + 1 
  4073 0000E71D 29C3                <1> 	sub	ebx, eax ; **
  4074 0000E71F 53                  <1> 	push	ebx ; LFB start/base address
  4075                              <1> 
  4076 0000E720 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  4077 0000E723 6629C8              <1> 	sub	ax, cx  ; - top left column
  4078 0000E726 40                  <1> 	inc	eax ; same column no == 1 column	 
  4079 0000E727 50                  <1> 	push	eax ; byte (pixel) count per window row
  4080 0000E728 52                  <1> 	push	edx
  4081                              <1> 	;;movzx	ebx, word [ebp+2] ; screen width
  4082                              <1> 	;; 28/12/2020
  4083                              <1> 	;mov	ebx, ebp ; screen width
  4084                              <1> 	;mov	eax, ecx
  4085                              <1> 	;shr	eax, 16	; top row
  4086                              <1> 	;mul	ebx
  4087                              <1> 	;mov	dx, cx ; top left column
  4088                              <1> 	;add	eax, edx
  4089                              <1> 	; 30/12/2020
  4090                              <1> 	; calculate start offset
  4091 0000E729 E806140000          <1> 	call	sysvideo_15_202
  4092 0000E72E 01C7                <1> 	add	edi, eax ; start address 
  4093 0000E730 01C6                <1> 	add	esi, eax
  4094 0000E732 59                  <1> 	pop	ecx ; edx
  4095                              <1> 	;mov	eax, ecx
  4096                              <1> 	;shr	eax, 16 ; bottom row  ; zero based
  4097                              <1> 	;mul	ebx
  4098                              <1> 	;mov	dx, cx ; bottom right column ; 0 based
  4099                              <1> 	;add	eax, edx
  4100                              <1> 	; 30/12/2020
  4101                              <1> 	; calculate start offset
  4102 0000E733 E8FE130000          <1> 	call	sysvideo_15_203
  4103 0000E738 5A                  <1> 	pop	edx ; byte (pixel) count per window row
  4104 0000E739 59                  <1> 	pop	ecx ; LFB start/base address
  4105 0000E73A 01C8                <1> 	add	eax, ecx ; stop address
  4106 0000E73C 59                  <1> 	pop	ecx ; the last byte of LFB + 1
  4107 0000E73D 39C8                <1> 	cmp	eax, ecx
  4108 0000E73F 739E                <1> 	jnb	short sysvideo_15_15
  4109                              <1> 	
  4110                              <1> 	;push	edi ; start address
  4111                              <1> 	;push	eax ; stop address (included)
  4112 0000E741 29D3                <1> 	sub	ebx, edx ; screen width - window width
  4113                              <1> sysvideo_15_18:
  4114 0000E743 89D1                <1> 	mov	ecx, edx
  4115 0000E745 F3A4                <1> 	rep	movsb
  4116 0000E747 0115[64030300]      <1> 	add	[u.r0], edx ; window width (byte count)
  4117                              <1> 	;or	ebx, ebx
  4118                              <1> 	;jz	short sysvideo_15_19
  4119 0000E74D 01DF                <1> 	add	edi, ebx ; add difference (for next row) 
  4120 0000E74F 01DE                <1> 	add	esi, ebx
  4121                              <1> ;sysvideo_15_19:
  4122                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  4123 0000E751 39C7                <1> 	cmp	edi, eax
  4124 0000E753 76EE                <1> 	jna	short sysvideo_15_18
  4125                              <1> sysvideo_15_19:
  4126                              <1> 	;pop	ebx ; stop address
  4127                              <1> 	;pop	edi ; start address
  4128 0000E755 E992F1FFFF          <1> 	jmp	sysret
  4129                              <1> 
  4130                              <1> sysvideo_15_20:
  4131 0000E75A 80FB05              <1> 	cmp	bl, 5
  4132 0000E75D 7752                <1>         ja      short sysvideo_15_25
  4133                              <1> 
  4134                              <1> 	; BL = 5 = window copy (user to system)
  4135                              <1> 
  4136                              <1> 	; eax = LFB page size in bytes
  4137                              <1> 
  4138 0000E75F 5F                  <1> 	pop	edi ; * ; LFB address
  4139                              <1> 
  4140                              <1> 	; esi = user buffer (in user's memory space)
  4141 0000E760 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  4142 0000E762 7309                <1>       	jnb	short sysvideo_15_21 ; window
  4143                              <1> 
  4144 0000E764 09D2                <1> 	or	edx, edx
  4145                              <1> 	;jnz	sysret  ; invalid !
  4146 0000E766 75ED                <1> 	jnz	short sysvideo_15_19
  4147                              <1> 
  4148                              <1> 	; full screen copy ; edx = 0, ecx > 0
  4149 0000E768 E907FFFFFF          <1> 	jmp	sysvideo_15_9_0 ; full screen copy
  4150                              <1> 
  4151                              <1> sysvideo_15_21:
  4152                              <1> 	; 29/12/2020
  4153                              <1> 	; fix dx to bp-1 if dx >= bp
  4154 0000E76D E8B7130000          <1> 	call	sysvideo_15_200
  4155                              <1> 	;
  4156                              <1> 	; 29/12/2020
  4157 0000E772 6639CA              <1> 	cmp	dx, cx ; righ pos >= left pos
  4158 0000E775 72DE                <1> 	jb	short sysvideo_15_19 ; wrong pos input
  4159                              <1> 
  4160                              <1> 	; 01/01/2021
  4161 0000E777 01F8                <1> 	add	eax, edi
  4162 0000E779 50                  <1> 	push	eax ; the last byte of LFB + 1 
  4163 0000E77A 57                  <1> 	push	edi ; LFB start/base address
  4164                              <1> 
  4165 0000E77B 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  4166 0000E77E 6629C8              <1> 	sub	ax, cx  ; - top left column
  4167 0000E781 40                  <1> 	inc	eax ; same column no == 1 column	 
  4168 0000E782 50                  <1> 	push	eax ; byte count per window row
  4169                              <1> 
  4170 0000E783 52                  <1> 	push	edx
  4171                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  4172                              <1> 	; 30/12/2020
  4173                              <1> 	; calculate start offset
  4174                              <1> 	;mov	ebx, ebp ; screen width
  4175                              <1> 	;mov	eax, ecx
  4176                              <1> 	;shr	eax, 16  ; top row
  4177                              <1> 	;mul	ebx
  4178                              <1> 	;mov	dx, cx ; top left column
  4179                              <1> 	;add	eax, edx
  4180 0000E784 E8AB130000          <1> 	call	sysvideo_15_202
  4181 0000E789 01C7                <1> 	add	edi, eax ; start address 
  4182 0000E78B 59                  <1> 	pop	ecx ; edx
  4183                              <1> 	;mov	eax, ecx
  4184                              <1> 	;shr	eax, 16 ; bottom row
  4185                              <1> 	;mul	ebx
  4186                              <1> 	;mov	dx, cx ; bottom right column
  4187                              <1> 	;add	eax, edx
  4188                              <1> 	; 30/12/2020
  4189                              <1> 	; calculate end offset
  4190 0000E78C E8A5130000          <1> 	call	sysvideo_15_203
  4191 0000E791 5A                  <1> 	pop	edx ; byte count per window row
  4192 0000E792 59                  <1> 	pop	ecx ; LFB start/base address
  4193 0000E793 01C8                <1> 	add	eax, ecx ; stop address
  4194 0000E795 59                  <1> 	pop	ecx ; the last byte of LFB + 1
  4195                              <1> 	; 29/12/2020
  4196 0000E796 39C8                <1> 	cmp	eax, ecx ; row >= vertical resolution ?
  4197 0000E798 7312                <1> 	jnb	short sysvideo_15_24 ; yes !, wrong !
  4198                              <1> 
  4199                              <1> 	;push	edi ; start address 
  4200 0000E79A 50                  <1> 	push	eax ; stop address (included)
  4201                              <1> sysvideo_15_22:
  4202 0000E79B 89D1                <1> 	mov	ecx, edx ; byte count
  4203                              <1> 	; user to system video/display page window transfer
  4204                              <1> 	; esi =	user buffer
  4205 0000E79D E86C2B0000          <1> 	call	transfer_from_user_buffer ; fast transfer
  4206 0000E7A2 7207                <1> 	jc	short sysvideo_15_23
  4207                              <1> 		; ecx = actual transfer count (= ecx input) 
  4208                              <1> 	;add	[u.r0], ecx
  4209                              <1> 	;add	edi, ebx ; next row in video memory window
  4210                              <1> 	;add	esi, ecx ; next window row in user's buffer
  4211                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  4212                              <1> 	; 30/12/2020
  4213 0000E7A4 E89A130000          <1> 	call	sysvideo_15_204
  4214 0000E7A9 76F0                <1> 	jna	short sysvideo_15_22
  4215                              <1> sysvideo_15_23:
  4216 0000E7AB 5B                  <1> 	pop	ebx ; stop address
  4217                              <1> 	;pop	edi ; start address
  4218                              <1> sysvideo_15_24:
  4219 0000E7AC E93BF1FFFF          <1> 	jmp	sysret
  4220                              <1> 
  4221                              <1> sysvideo_15_25:
  4222 0000E7B1 80FB06              <1> 	cmp	bl, 6
  4223 0000E7B4 7752                <1> 	ja	short sysvideo_15_28
  4224                              <1> 
  4225                              <1> 	; BL = 6 = window copy (system to user)
  4226                              <1> 
  4227                              <1> 	; eax = LFB page size in bytes
  4228                              <1> 
  4229 0000E7B6 89F7                <1> 	mov	edi, esi ; user buffer
  4230                              <1> 
  4231 0000E7B8 5E                  <1> 	pop	esi ; * ; LFB address
  4232                              <1> 
  4233                              <1> 	; edi = user buffer (in user's memory space)
  4234 0000E7B9 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  4235 0000E7BB 7309                <1>         jnb     short sysvideo_15_26
  4236                              <1> 	
  4237 0000E7BD 21D2                <1> 	and	edx, edx
  4238                              <1> 	;jnz	sysret	; invalid !
  4239 0000E7BF 75EB                <1> 	jnz	short sysvideo_15_24
  4240                              <1> 
  4241                              <1> 	; full screen copy  ; edx = 0, ecx > 0
  4242 0000E7C1 E997FEFFFF          <1> 	jmp	sysvideo_15_7_0
  4243                              <1> 
  4244                              <1> sysvideo_15_26:
  4245                              <1> 	; 29/12/2020
  4246                              <1> 	; fix dx to bp-1 if dx >= bp
  4247 0000E7C6 E85E130000          <1> 	call	sysvideo_15_200
  4248                              <1> 	;
  4249                              <1> 	; 29/12/2020
  4250 0000E7CB 6639CA              <1> 	cmp	dx, cx ; righ pos >= left pos
  4251 0000E7CE 72DC                <1> 	jb	short sysvideo_15_24 ; wrong pos input
  4252                              <1> 
  4253 0000E7D0 89F3                <1> 	mov	ebx, esi ; LFB address
  4254 0000E7D2 01D8                <1> 	add	eax, ebx
  4255 0000E7D4 50                  <1> 	push	eax ; the last byte of LFB + 1 
  4256 0000E7D5 53                  <1> 	push	ebx ; LFB start/base address
  4257                              <1> 
  4258 0000E7D6 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  4259 0000E7D9 6629C8              <1> 	sub	ax, cx  ; - top left column
  4260 0000E7DC 40                  <1>       	inc	eax ; same column no == 1 column	 
  4261 0000E7DD 50                  <1> 	push	eax ; byte count per window row
  4262                              <1> 
  4263 0000E7DE 52                  <1> 	push	edx
  4264                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  4265                              <1> 	; 30/12/2020
  4266                              <1> 	; calculate start offset
  4267                              <1> 	;mov	ebx, ebp ; screen width
  4268                              <1> 	;mov	eax, ecx
  4269                              <1> 	;shr	eax, 16  ; top row
  4270                              <1> 	;mul	ebx
  4271                              <1> 	;mov	dx, cx ; top left column
  4272                              <1> 	;add	eax, edx
  4273 0000E7DF E850130000          <1> 	call	sysvideo_15_202
  4274 0000E7E4 01C6                <1> 	add	esi, eax ; start address 
  4275 0000E7E6 59                  <1> 	pop	ecx ; edx
  4276                              <1> 	;mov	eax, ecx
  4277                              <1> 	;shr	eax, 16 ; bottom row
  4278                              <1> 	;mul	ebx
  4279                              <1> 	;mov	dx, cx ; bottom right column
  4280                              <1> 	;add	eax, edx
  4281                              <1> 	; 30/12/2020
  4282                              <1> 	; calculate end offset
  4283 0000E7E7 E84A130000          <1> 	call	sysvideo_15_203
  4284 0000E7EC 5A                  <1> 	pop	edx ; byte count per window row
  4285 0000E7ED 59                  <1> 	pop	ecx ; LFB start/base address
  4286 0000E7EE 01C8                <1> 	add	eax, ecx ; stop address
  4287 0000E7F0 59                  <1> 	pop	ecx ; the last byte of LFB + 1
  4288                              <1> 	; 29/12/2020
  4289 0000E7F1 39C8                <1> 	cmp	eax, ecx ; row >= vertical resolution ?
  4290 0000E7F3 73B7                <1> 	jnb	short sysvideo_15_24 ; yes !, wrong !
  4291                              <1> 	
  4292                              <1> 	;push	esi ; start address 
  4293 0000E7F5 50                  <1> 	push	eax ; stop address (included)
  4294                              <1> sysvideo_15_27:
  4295 0000E7F6 89D1                <1> 	mov	ecx, edx ; byte count
  4296                              <1> 	; user to system video/display page window transfer
  4297                              <1> 	; esi =	user buffer
  4298 0000E7F8 E8C72A0000          <1> 	call	transfer_to_user_buffer ; fast transfer
  4299                              <1> 	;jc	short sysvideo_15_27_0
  4300 0000E7FD 72AC                <1> 	jc	short sysvideo_15_23
  4301                              <1> 	;add	[u.r0], ecx
  4302                              <1> 	;add	edi, ebx ; next row in video memory window
  4303                              <1> 	;add	esi, ecx ; next window row in user's buffer
  4304                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  4305                              <1> 	; 30/12/2020
  4306 0000E7FF E83F130000          <1> 	call	sysvideo_15_204
  4307 0000E804 76F0                <1> 	jna	short sysvideo_15_27
  4308 0000E806 EBA3                <1> 	jmp	short sysvideo_15_23
  4309                              <1> 
  4310                              <1> sysvideo_15_28:
  4311                              <1> 	; bl = 7, 8, 9, 10, 11, 12, 13
  4312                              <1> 	; (bl > 13 is invalid for current kernel version)
  4313                              <1> 
  4314                              <1> 	;cmp	bl, 13
  4315                              <1> 	;ja	short sysvideo_15_23
  4316                              <1> 
  4317                              <1> 	; 01/01/2021
  4318 0000E808 80FB0D              <1> 	cmp	bl, 13
  4319 0000E80B 0F8722080000        <1> 	ja	sysvideo_15_138
  4320                              <1> 
  4321                              <1> 	; eax = LFB video page size (w*h) in bytes
  4322                              <1> 
  4323 0000E811 5E                  <1> 	pop	esi ; * ; LFB base/start address
  4324 0000E812 91                  <1> 	xchg	eax, ecx ; ecx = byte (pixel) count
  4325                              <1> 			 ; al = byte for and/or/xor 
  4326 0000E813 890D[64030300]      <1> 	mov	[u.r0], ecx ; return with
  4327                              <1> 			   ; byte count of display page
  4328                              <1> 			   ; (eax > 0 -> OK)	
  4329 0000E819 80FB0A              <1> 	cmp	bl, 10
  4330 0000E81C 720C                <1> 	jb	short sysvideo_15_29 ; 7, 8, 9
  4331 0000E81E 7414                <1> 	je	short sysvideo_15_31 ; 10
  4332 0000E820 80FB0C              <1> 	cmp	bl, 12
  4333 0000E823 7216                <1> 	jb	short sysvideo_15_32 ; 11
  4334 0000E825 741B                <1> 	je	short sysvideo_15_33 ; 12
  4335                              <1> 
  4336                              <1> 	; BL = 13 = NOT display page bytes
  4337 0000E827 C1E902              <1> 	shr	ecx, 2 ; dword count
  4338                              <1> sysvideo_15_29:
  4339 0000E82A F716                <1> 	not	dword [esi]
  4340 0000E82C AD                  <1> 	lodsd
  4341 0000E82D E2FB                <1> 	loop	sysvideo_15_29
  4342                              <1> 
  4343                              <1> sysvideo_15_30:
  4344 0000E82F E9B8F0FFFF          <1> 	jmp	sysret
  4345                              <1> 
  4346                              <1> 	; BL = 10 = INC display page bytes
  4347                              <1> sysvideo_15_31:
  4348 0000E834 FE06                <1> 	inc	byte [esi]
  4349 0000E836 46                  <1> 	inc	esi
  4350 0000E837 E2FB                <1> 	loop	sysvideo_15_31
  4351 0000E839 EBF4                <1> 	jmp	short sysvideo_15_30
  4352                              <1> 
  4353                              <1> 	; BL = 11 = DEC display page bytes
  4354                              <1> sysvideo_15_32:
  4355 0000E83B FE0E                <1> 	dec	byte [esi]
  4356 0000E83D 46                  <1> 	inc	esi
  4357 0000E83E E2FB                <1> 	loop	sysvideo_15_32
  4358 0000E840 EBED                <1> 	jmp	short sysvideo_15_30
  4359                              <1> 
  4360                              <1> 	; BL = 11 = NEG display page bytes
  4361                              <1> sysvideo_15_33:
  4362 0000E842 F61E                <1> 	neg	byte [esi]
  4363 0000E844 46                  <1> 	inc	esi
  4364 0000E845 E2FB                <1> 	loop	sysvideo_15_33
  4365 0000E847 EBE6                <1> 	jmp	short sysvideo_15_30
  4366                              <1> 
  4367                              <1> sysvideo_15_34:
  4368                              <1> 	; bl = 7, 8, 9
  4369                              <1> 	; ecx = byte (pixel) count
  4370 0000E849 C1E902              <1> 	shr	ecx, 2 ; dword count
  4371 0000E84C 88C4                <1> 	mov	ah, al
  4372 0000E84E 6689C2              <1> 	mov	dx, ax
  4373 0000E851 C1E210              <1> 	shl	edx, 16 
  4374 0000E854 6689C2              <1> 	mov	dx, ax
  4375                              <1> 		 ; edx = 4 bytes for and/or/xor
  4376                              <1> 
  4377 0000E857 80FB08              <1> 	cmp	bl, 8
  4378 0000E85A 7409                <1> 	je	short sysvideo_15_36
  4379 0000E85C 770E                <1> 	ja	short sysvideo_15_37
  4380                              <1> 
  4381                              <1> 	; BL = 7 = AND display page bytes with CL
  4382                              <1> sysvideo_15_35:
  4383 0000E85E 2116                <1> 	and	[esi], edx
  4384 0000E860 AD                  <1> 	lodsd
  4385 0000E861 E2FB                <1> 	loop	sysvideo_15_35
  4386                              <1> 	;jmp	sysret	
  4387 0000E863 EB0C                <1> 	jmp	short sysvideo_15_38
  4388                              <1> 
  4389                              <1> 	; BL = 8 = OR display page bytes with CL
  4390                              <1> sysvideo_15_36:
  4391 0000E865 0916                <1> 	or	[esi], edx
  4392 0000E867 AD                  <1> 	lodsd
  4393 0000E868 E2FB                <1> 	loop	sysvideo_15_36
  4394                              <1> 	;jmp	sysret	
  4395 0000E86A EB05                <1> 	jmp	short sysvideo_15_38
  4396                              <1> 
  4397                              <1> 	; BL = 9 = XOR display page bytes with CL
  4398                              <1> sysvideo_15_37:
  4399 0000E86C 3116                <1> 	xor	[esi], edx
  4400 0000E86E AD                  <1> 	lodsd
  4401 0000E86F E2FB                <1> 	loop	sysvideo_15_37
  4402                              <1> sysvideo_15_38:
  4403 0000E871 E976F0FFFF          <1> 	jmp	sysret
  4404                              <1> 
  4405                              <1> sysvideo_15_39:
  4406                              <1> 	; bh > 8 (bpp, 16 or 24 or 32)
  4407                              <1> 	
  4408 0000E876 80FF18              <1> 	cmp	bh, 24
  4409 0000E879 0F8760020000        <1> 	ja	sysvideo_15_72
  4410 0000E87F 0F84C6040000        <1> 	je	sysvideo_15_105
  4411                              <1> 
  4412                              <1> 	; bh = bits per pixel (bpp) = 16
  4413                              <1> 
  4414                              <1> 	; eax = linear frame buffer (VIDEO PAGE) pixel count
  4415                              <1> 	;	(half of video page size in bytes)
  4416                              <1> 
  4417 0000E885 D1E0                <1> 	shl	eax, 1 ; byte count = 2 * pixel count 
  4418                              <1> 
  4419                              <1> 	; sub function for sysvideo function bh = 2
  4420 0000E887 20DB                <1> 	and	bl, bl ; 0 ?
  4421 0000E889 7511                <1> 	jnz	short sysvideo_15_40 ; no
  4422                              <1> 
  4423                              <1> 	; BL = 0 = Fill color (color in CX)
  4424                              <1> 
  4425 0000E88B 5F                  <1> 	pop	edi ; * ; LFB address
  4426                              <1> 
  4427 0000E88C A3[64030300]        <1> 	mov	[u.r0], eax ; return value to user
  4428                              <1> 
  4429 0000E891 91                  <1> 	xchg	eax, ecx ; ax = color, ecx = byte count
  4430                              <1> 
  4431                              <1> 	; 16 bit pixels
  4432 0000E892 D1E9                <1> 	shr	ecx, 1
  4433                              <1> 	; ecx = pixel count
  4434                              <1> 
  4435 0000E894 F366AB              <1> 	rep	stosw
  4436                              <1> 
  4437                              <1> 	; [u.r0] = transfer (fill) count in bytes
  4438 0000E897 E950F0FFFF          <1> 	jmp	sysret
  4439                              <1> 
  4440                              <1> sysvideo_15_40:
  4441                              <1> 	; eax = linear frame buffer (VIDEO PAGE) byte count
  4442                              <1> 	;       (2 * pixel count) 
  4443                              <1> 
  4444 0000E89C 80FB02              <1> 	cmp	bl, 2	
  4445 0000E89F 7725                <1> 	ja	short sysvideo_15_45
  4446 0000E8A1 7217                <1> 	jb	short sysvideo_15_43
  4447                              <1> 
  4448                              <1> 	; BL = 2 = system to user video/display page transfer
  4449 0000E8A3 5E                  <1> 	pop	esi ; * ; LFB address
  4450 0000E8A4 89CF                <1> 	mov	edi, ecx ; user's buffer
  4451                              <1> sysvideo_15_41:
  4452 0000E8A6 89C1                <1> 	mov	ecx, eax ; LFB video page byte count
  4453 0000E8A8 E8172A0000          <1> 	call	transfer_to_user_buffer ; fast transfer
  4454                              <1> sysvideo_15_42:
  4455                              <1> 	;jc	sysret ; [u.r0] = 0
  4456 0000E8AD 72C2                <1> 	jc	short sysvideo_15_38
  4457 0000E8AF 890D[64030300]      <1> 	mov	[u.r0], ecx ; actual transfer count	
  4458 0000E8B5 E932F0FFFF          <1> 	jmp	sysret
  4459                              <1> 
  4460                              <1> sysvideo_15_43:
  4461                              <1> 	; BL = 1 = user to system video/display page transfer
  4462 0000E8BA 5F                  <1> 	pop	edi ; * ; LFB address
  4463 0000E8BB 89CE                <1> 	mov	esi, ecx ; user's buffer
  4464                              <1> sysvideo_15_44:
  4465 0000E8BD 89C1                <1> 	mov	ecx, eax ; LFB video page byte count
  4466 0000E8BF E84A2A0000          <1> 	call	transfer_from_user_buffer ; fast transfer
  4467 0000E8C4 EBE7                <1> 	jmp	short sysvideo_15_42
  4468                              <1> 
  4469                              <1> sysvideo_15_45:
  4470 0000E8C6 80FB03              <1> 	cmp	bl, 3
  4471 0000E8C9 776A                <1> 	ja	short sysvideo_15_51
  4472                              <1> 
  4473                              <1> 	; BL = 3 = NOT bits in window (ECX, EDX)
  4474 0000E8CB 5E                  <1> 	pop	esi ; * ; LFB address
  4475                              <1> 
  4476 0000E8CC 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  4477 0000E8CE 7318                <1> 	jnb	short sysvideo_15_47 ; window
  4478                              <1> 
  4479 0000E8D0 09D2                <1> 	or	edx, edx
  4480 0000E8D2 755C                <1> 	jnz	short sysvideo_15_50  ; invalid !
  4481                              <1> 
  4482                              <1> 	; full screen (update) ; edx = 0, ecx > 0
  4483 0000E8D4 89C1                <1> 	mov	ecx, eax ; LFB video page byte count
  4484 0000E8D6 A3[64030300]        <1> 	mov	[u.r0], eax
  4485 0000E8DB C1E902              <1> 	shr	ecx, 2  ; dword 'NOT'
  4486                              <1> sysvideo_15_46:
  4487 0000E8DE F716                <1> 	not	dword [esi]
  4488 0000E8E0 AD                  <1> 	lodsd	; add esi, 4
  4489 0000E8E1 E2FB                <1> 	loop	sysvideo_15_46
  4490 0000E8E3 E904F0FFFF          <1> 	jmp	sysret
  4491                              <1> 
  4492                              <1> sysvideo_15_47:
  4493                              <1> 	; 29/12/2020
  4494                              <1> 	; fix dx to bp-1 if dx >= bp
  4495 0000E8E8 E83C120000          <1> 	call	sysvideo_15_200
  4496                              <1> 	;
  4497                              <1> 	; 29/12/2020
  4498 0000E8ED 89F7                <1> 	mov	edi, esi
  4499 0000E8EF 01C7                <1> 	add	edi, eax ; end word of video page + 2
  4500 0000E8F1 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  4501 0000E8F4 6629C8              <1> 	sub	ax, cx  ; - top left column
  4502 0000E8F7 7237                <1> 	jb      short sysvideo_15_50 ; invalid
  4503 0000E8F9 40                  <1>         inc	eax ; same column no == 1 column	 
  4504 0000E8FA 50                  <1> 	push	eax ; pixel count per window row
  4505 0000E8FB 52                  <1> 	push	edx
  4506                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  4507                              <1> 	; 30/12/2020
  4508                              <1> 	; calculate start offset
  4509 0000E8FC E833120000          <1> 	call	sysvideo_15_202
  4510 0000E901 D1E0                <1> 	shl	eax, 1	; pixel pos -> byte pos
  4511 0000E903 01C6                <1> 	add	esi, eax ; start address 
  4512 0000E905 59                  <1> 	pop	ecx ; edx
  4513                              <1> 	;mov	eax, ecx
  4514                              <1> 	;shr	eax, 16 ; bottom row  ; zero based
  4515                              <1> 	;mul	ebx
  4516                              <1> 	;mov	dx, cx ; bottom right column ; 0 based
  4517                              <1> 	;add	eax, edx
  4518                              <1> 	; 30/12/2020
  4519                              <1> 	; calculate start offset
  4520 0000E906 E82B120000          <1> 	call	sysvideo_15_203
  4521 0000E90B D1E0                <1> 	shl	eax, 1	; pixel pos -> byte pos
  4522 0000E90D 5A                  <1> 	pop	edx ; pixel count per window row
  4523                              <1> 	; eax = the last byte to be converted 
  4524 0000E90E 01F0                <1> 	add	eax, esi
  4525 0000E910 39C7                <1> 	cmp	edi, eax
  4526 0000E912 761C                <1> 	jna	short sysvideo_15_50 ; out of video page
  4527 0000E914 89C7                <1> 	mov	edi, eax ; stop address
  4528 0000E916 29D3                <1> 	sub	ebx, edx ; screen width - window width
  4529 0000E918 D1E3                <1> 	shl	ebx, 1 ; pixel count -> byte count
  4530 0000E91A D1E2                <1> 	shl	edx, 1 ; byte count
  4531 0000E91C 4E                  <1> 	dec	esi 
  4532                              <1> sysvideo_15_48:
  4533 0000E91D 89D1                <1> 	mov	ecx, edx ; window width (byte count)
  4534                              <1> sysvideo_15_49:
  4535 0000E91F 46                  <1> 	inc	esi
  4536 0000E920 F616                <1> 	not	byte [esi]
  4537 0000E922 E2FB                <1> 	loop	sysvideo_15_49
  4538 0000E924 0115[64030300]      <1> 	add	[u.r0], edx ; 1 pixel = 2 bytes
  4539 0000E92A 01DE                <1> 	add	esi, ebx ; add difference for next row
  4540                              <1> 	;
  4541 0000E92C 39FE                <1> 	cmp	esi, edi ; stop address (included in loop)
  4542 0000E92E 76ED                <1> 	jna	short sysvideo_15_48
  4543                              <1> sysvideo_15_50:
  4544 0000E930 E9B7EFFFFF          <1> 	jmp	sysret	
  4545                              <1> 
  4546                              <1> sysvideo_15_51:
  4547 0000E935 80FB04              <1> 	cmp	bl, 4
  4548 0000E938 7779                <1>         ja	short sysvideo_15_55
  4549                              <1> 
  4550                              <1> 	; BL = 4 = window copy (system to system)
  4551                              <1> 
  4552                              <1> 	; eax = LFB video page byte count 
  4553                              <1> 	;	(2 * pixel count)
  4554                              <1> 
  4555 0000E93A 5B                  <1> 	pop	ebx ; * ; LFB address
  4556                              <1> 
  4557 0000E93B 39DE                <1> 	cmp	esi, ebx
  4558 0000E93D 72F1                <1> 	jb	short sysvideo_15_50
  4559                              <1> 
  4560 0000E93F 39DF                <1> 	cmp	edi, ebx
  4561 0000E941 72ED                <1> 	jb	short sysvideo_15_50
  4562 0000E943 01C3                <1> 	add	ebx, eax ; **
  4563 0000E945 39DE                <1> 	cmp	esi, ebx
  4564 0000E947 73E7                <1> 	jnb	short sysvideo_15_50
  4565 0000E949 39DF                <1> 	cmp	edi, ebx
  4566 0000E94B 73E3                <1> 	jnb	short sysvideo_15_50
  4567                              <1> 	
  4568 0000E94D 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  4569 0000E94F 7312                <1> 	jnb	short sysvideo_15_52 ; window
  4570                              <1> 
  4571 0000E951 09D2                <1> 	or	edx, edx
  4572 0000E953 75DB                <1> 	jnz	short sysvideo_15_50 ; invalid !
  4573                              <1> 
  4574 0000E955 A3[64030300]        <1> 	mov	[u.r0], eax
  4575 0000E95A 89C1                <1> 	mov	ecx, eax ; byte count
  4576                              <1> 	; full screen copy ; edx = 0, ecx > 0
  4577 0000E95C F3A4                <1> 	rep	movsb
  4578 0000E95E E989EFFFFF          <1> 	jmp	sysret
  4579                              <1> sysvideo_15_52:
  4580                              <1> 	; 29/12/2020
  4581                              <1> 	; fix dx to bp-1 if dx >= bp
  4582 0000E963 E8C1110000          <1> 	call	sysvideo_15_200
  4583                              <1> 	;
  4584                              <1> 	; 29/12/2020
  4585 0000E968 6639CA              <1> 	cmp	dx, cx
  4586 0000E96B 72C3                <1>         jb      short sysvideo_15_50 ; invalid
  4587                              <1> 
  4588 0000E96D 53                  <1> 	push	ebx ; end word of video page + 2
  4589 0000E96E 29C3                <1> 	sub	ebx, eax ; **
  4590 0000E970 53                  <1> 	push	ebx ; LFB start/base address
  4591                              <1> 
  4592 0000E971 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  4593 0000E974 6629C8              <1> 	sub	ax, cx  ; - top left column
  4594 0000E977 40                  <1> 	inc	eax ; same column no == 1 column	 
  4595 0000E978 50                  <1> 	push	eax ; pixel count per window row
  4596 0000E979 52                  <1> 	push	edx
  4597                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  4598                              <1> 	; 30/12/2020
  4599                              <1> 	; calculate start offset
  4600 0000E97A E8B5110000          <1> 	call	sysvideo_15_202
  4601 0000E97F D1E0                <1> 	shl	eax, 1 ; pixel pos -> byte pos
  4602 0000E981 01C7                <1> 	add	edi, eax ; start address 
  4603 0000E983 01C6                <1> 	add	esi, eax
  4604 0000E985 59                  <1> 	pop	ecx ; edx
  4605                              <1> 	; 30/12/2020
  4606                              <1> 	; calculate start offset
  4607 0000E986 E8AB110000          <1> 	call	sysvideo_15_203
  4608 0000E98B D1E0                <1> 	shl	eax, 1 ; pixel pos -> byte pos
  4609 0000E98D 5A                  <1> 	pop	edx ; pixel count per window row
  4610 0000E98E 59                  <1> 	pop	ecx ; LFB start/base address
  4611 0000E98F 01C8                <1> 	add	eax, ecx ; stop address
  4612 0000E991 59                  <1> 	pop	ecx ; the last word of LFB + 2
  4613 0000E992 39C8                <1> 	cmp	eax, ecx
  4614 0000E994 739A                <1> 	jnb	short sysvideo_15_50
  4615                              <1> 	
  4616                              <1> 	;push	edi ; start address
  4617                              <1> 	;push	eax ; stop address (included)
  4618 0000E996 29D3                <1> 	sub	ebx, edx ; screen width - window width
  4619 0000E998 D1E3                <1> 	shl	ebx, 1 ; pixel count -> byte count
  4620 0000E99A D1E2                <1> 	shl	edx, 1 ; pixel count -> byte count
  4621                              <1> sysvideo_15_53:
  4622 0000E99C 89D1                <1> 	mov	ecx, edx
  4623 0000E99E F3A4                <1> 	rep	movsb
  4624 0000E9A0 0115[64030300]      <1> 	add	[u.r0], edx ; 1 pixel = 2 bytes
  4625                              <1> 	;or	ebx, ebx
  4626                              <1> 	;jz	short sysvideo_15_54
  4627 0000E9A6 01DF                <1> 	add	edi, ebx ; add difference (for next row) 
  4628 0000E9A8 01DE                <1> 	add	esi, ebx
  4629                              <1> ;sysvideo_15_54:
  4630                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  4631 0000E9AA 39C7                <1> 	cmp	edi, eax
  4632 0000E9AC 76EE                <1> 	jna	short sysvideo_15_53
  4633                              <1> sysvideo_15_54:
  4634                              <1> 	;pop	ebx ; stop address
  4635                              <1> 	;pop	edi ; start address
  4636 0000E9AE E939EFFFFF          <1> 	jmp	sysret
  4637                              <1> 
  4638                              <1> sysvideo_15_55:
  4639 0000E9B3 80FB05              <1> 	cmp	bl, 5
  4640 0000E9B6 775A                <1>         ja      short sysvideo_15_60
  4641                              <1> 
  4642                              <1> 	; BL = 5 = window copy (user to system)
  4643                              <1> 
  4644                              <1> 	; eax = LFB video page byte count 
  4645                              <1> 	;	(2 * pixel count)
  4646                              <1> 
  4647 0000E9B8 5F                  <1> 	pop	edi ; * ; LFB address
  4648                              <1> 
  4649                              <1> 	; esi = user buffer (in user's memory space)
  4650 0000E9B9 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  4651 0000E9BB 7309                <1>       	jnb	short sysvideo_15_56 ; window
  4652                              <1> 
  4653 0000E9BD 09D2                <1> 	or	edx, edx
  4654                              <1> 	;jnz	sysret  ; invalid !
  4655 0000E9BF 75ED                <1> 	jnz	short sysvideo_15_54
  4656                              <1> 
  4657                              <1> 	; full screen copy ; edx = 0, ecx > 0
  4658 0000E9C1 E9F7FEFFFF          <1> 	jmp	sysvideo_15_44 ; full screen copy
  4659                              <1> 
  4660                              <1> sysvideo_15_56:
  4661                              <1> 	; 29/12/2020
  4662                              <1> 	; fix dx to bp-1 if dx >= bp
  4663 0000E9C6 E85E110000          <1> 	call	sysvideo_15_200
  4664                              <1> 	;
  4665                              <1> 	; 29/12/2020
  4666 0000E9CB 6639CA              <1> 	cmp	dx, cx
  4667 0000E9CE 72DE                <1> 	jb	short sysvideo_15_54
  4668                              <1> 
  4669                              <1> 	; 01/01/2021
  4670 0000E9D0 01F8                <1> 	add	eax, edi
  4671 0000E9D2 50                  <1> 	push	eax ; the last word of LFB + 2 
  4672 0000E9D3 57                  <1> 	push	edi ; LFB start/base address
  4673                              <1> 
  4674 0000E9D4 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  4675 0000E9D7 6629C8              <1> 	sub	ax, cx  ; - top left column
  4676 0000E9DA 40                  <1> 	inc	eax ; same column no == 1 column	 
  4677 0000E9DB 50                  <1> 	push	eax ; pixel count per window row
  4678                              <1> 
  4679 0000E9DC 52                  <1> 	push	edx
  4680                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  4681                              <1> 	; 30/12/2020
  4682                              <1> 	; calculate start offset
  4683 0000E9DD E852110000          <1> 	call	sysvideo_15_202
  4684 0000E9E2 D1E0                <1> 	shl	eax, 1 ; pixel pos -> byte pos
  4685 0000E9E4 01C7                <1> 	add	edi, eax ; start address 
  4686 0000E9E6 59                  <1> 	pop	ecx ; edx
  4687                              <1> 	; 30/12/2020
  4688                              <1> 	; calculate end offset
  4689 0000E9E7 E84A110000          <1> 	call	sysvideo_15_203
  4690 0000E9EC D1E0                <1> 	shl	eax, 1 ; pixel pos -> byte pos
  4691 0000E9EE 5A                  <1> 	pop	edx ; pixel count per window row
  4692 0000E9EF 59                  <1> 	pop	ecx ; LFB start/base address
  4693 0000E9F0 01C8                <1> 	add	eax, ecx ; stop address
  4694 0000E9F2 59                  <1> 	pop	ecx ; the last word of LFB + 2
  4695 0000E9F3 39C8                <1> 	cmp	eax, ecx
  4696                              <1> 	;jnb	sysret
  4697 0000E9F5 73B7                <1> 	jnb	short sysvideo_15_54
  4698                              <1> 
  4699                              <1> 	; 29/12/2020
  4700 0000E9F7 D1E3                <1> 	shl	ebx, 1 ; from pixel count to byte count 
  4701 0000E9F9 D1E2                <1> 	shl	edx, 1 ; pixel count -> byte count 
  4702                              <1> 	;push	edi ; start address 
  4703 0000E9FB 50                  <1> 	push	eax ; stop address (included)
  4704                              <1> sysvideo_15_57:
  4705 0000E9FC 89D1                <1> 	mov	ecx, edx ; byte count
  4706                              <1> 	; user to system video/display page window transfer
  4707                              <1> 	; esi =	user buffer
  4708 0000E9FE E80B290000          <1> 	call	transfer_from_user_buffer ; fast transfer
  4709 0000EA03 7207                <1> 	jc	short sysvideo_15_58
  4710                              <1> 		; ecx = actual transfer count (= ecx input) 
  4711                              <1> 	;add	[u.r0], ecx
  4712                              <1> 	;add	edi, ebx ; next row in video memory window
  4713                              <1> 	;add	esi, ecx ; next window row in user's buffer
  4714                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  4715                              <1> 	; 30/12/2020
  4716 0000EA05 E839110000          <1> 	call	sysvideo_15_204
  4717 0000EA0A 76F0                <1> 	jna	short sysvideo_15_57
  4718                              <1> sysvideo_15_58:
  4719 0000EA0C 5B                  <1> 	pop	ebx ; stop address
  4720                              <1> 	;pop	edi ; start address
  4721                              <1> sysvideo_15_59:
  4722 0000EA0D E9DAEEFFFF          <1> 	jmp	sysret
  4723                              <1> 
  4724                              <1> sysvideo_15_60:
  4725 0000EA12 80FB06              <1> 	cmp	bl, 6
  4726 0000EA15 775A                <1> 	ja	short sysvideo_15_63
  4727                              <1> 
  4728                              <1> 	; BL = 6 = window copy (system to user)
  4729                              <1> 
  4730                              <1> 	; eax = LFB video page byte count 
  4731                              <1> 	;	(2 * pixel count)
  4732                              <1> 
  4733 0000EA17 89F7                <1> 	mov	edi, esi ; user buffer
  4734                              <1> 
  4735 0000EA19 5E                  <1> 	pop	esi ; * ; LFB address
  4736                              <1> 
  4737                              <1> 	; edi = user buffer (in user's memory space)
  4738 0000EA1A 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  4739 0000EA1C 7309                <1>         jnb     short sysvideo_15_61
  4740                              <1> 	
  4741 0000EA1E 21D2                <1> 	and	edx, edx
  4742                              <1> 	;jnz	sysret	; invalid !
  4743 0000EA20 75EB                <1> 	jnz	short sysvideo_15_59
  4744                              <1> 
  4745                              <1> 	; full screen copy  ; edx = 0, ecx > 0
  4746 0000EA22 E97FFEFFFF          <1> 	jmp	sysvideo_15_41
  4747                              <1> 
  4748                              <1> sysvideo_15_61:
  4749                              <1> 	; 29/12/2020
  4750                              <1> 	; fix dx to bp-1 if dx >= bp
  4751 0000EA27 E8FD100000          <1> 	call	sysvideo_15_200
  4752                              <1> 	;
  4753                              <1> 	; 29/12/2020
  4754 0000EA2C 6639CA              <1> 	cmp	dx, cx
  4755 0000EA2F 72DC                <1> 	jb	short sysvideo_15_59
  4756                              <1> 
  4757 0000EA31 89F3                <1> 	mov	ebx, esi ; LFB address
  4758 0000EA33 01D8                <1> 	add	eax, ebx
  4759 0000EA35 50                  <1> 	push	eax ; the last word of LFB + 2 
  4760 0000EA36 53                  <1> 	push	ebx ; LFB start/base address
  4761                              <1> 
  4762 0000EA37 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  4763 0000EA3A 6629C8              <1> 	sub	ax, cx  ; - top left column
  4764 0000EA3D 40                  <1> 	inc	eax ; same column no == 1 column	 
  4765 0000EA3E 50                  <1> 	push	eax ; pixel count per window row
  4766                              <1> 
  4767 0000EA3F 52                  <1> 	push	edx
  4768                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  4769                              <1> 	; 30/12/2020
  4770                              <1> 	; calculate start offset
  4771 0000EA40 E8EF100000          <1> 	call	sysvideo_15_202
  4772 0000EA45 D1E0                <1> 	shl	eax, 1 ; pixel pos -> byte pos
  4773 0000EA47 01C6                <1> 	add	esi, eax ; start address 
  4774 0000EA49 59                  <1> 	pop	ecx ; edx
  4775                              <1> 	; 30/12/2020
  4776                              <1> 	; calculate end offset
  4777 0000EA4A E8E7100000          <1> 	call	sysvideo_15_203
  4778 0000EA4F D1E0                <1> 	shl	eax, 1 ; pixel pos -> byte pos
  4779 0000EA51 5A                  <1> 	pop	edx ; pixel count per window row
  4780 0000EA52 59                  <1> 	pop	ecx ; LFB start/base address
  4781 0000EA53 01C8                <1> 	add	eax, ecx ; stop address
  4782 0000EA55 59                  <1> 	pop	ecx ; the last word of LFB + 2
  4783 0000EA56 39C8                <1> 	cmp	eax, ecx
  4784                              <1> 	;jnb	sysret
  4785 0000EA58 73B3                <1> 	jnb	short sysvideo_15_59
  4786                              <1> 	
  4787                              <1> 	; 29/12/2020
  4788 0000EA5A D1E3                <1> 	shl	ebx, 1 ; from pixel count to byte count 
  4789 0000EA5C D1E2                <1> 	shl	edx, 1 ; pixel count -> byte count 
  4790                              <1> 	;push	esi ; start address 
  4791 0000EA5E 50                  <1> 	push	eax ; stop address (included)
  4792                              <1> sysvideo_15_62:
  4793 0000EA5F 89D1                <1> 	mov	ecx, edx ; byte count
  4794                              <1> 	; user to system video/display page window transfer
  4795                              <1> 	; esi =	user buffer
  4796 0000EA61 E85E280000          <1> 	call	transfer_to_user_buffer ; fast transfer
  4797                              <1> 	;jc	short sysvideo_15_62_0
  4798 0000EA66 72A4                <1> 	jc	short sysvideo_15_58
  4799                              <1> 	;add	[u.r0], ecx
  4800                              <1> 	;add	edi, ebx ; next row in video memory window
  4801                              <1> 	;add	esi, ecx ; next window row in user's buffer
  4802                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  4803                              <1> 	; 30/12/2020
  4804 0000EA68 E8D6100000          <1> 	call	sysvideo_15_204
  4805 0000EA6D 76F0                <1> 	jna	short sysvideo_15_62
  4806 0000EA6F EB9B                <1> 	jmp	short sysvideo_15_58
  4807                              <1> 
  4808                              <1> sysvideo_15_63:
  4809                              <1> 	; bl = 7, 8, 9, 10, 11, 12, 13
  4810                              <1> 	; (bl > 13 is invalid for current kernel version)
  4811                              <1> 
  4812                              <1> 	;cmp	bl, 13
  4813                              <1> 	;ja	sysvideo_15_58
  4814                              <1> 
  4815                              <1> 	; 01/01/2021
  4816 0000EA71 80FB0E              <1> 	cmp	bl, 14
  4817 0000EA74 0F83C7060000        <1> 	jnb	sysvideo_15_151
  4818                              <1> 
  4819                              <1> 	; eax = LFB video page size (w*h*2) in bytes
  4820                              <1> 
  4821 0000EA7A 5E                  <1> 	pop	esi ; * ; LFB base/start address
  4822 0000EA7B 91                  <1> 	xchg	eax, ecx ; ecx = byte count
  4823                              <1> 			 ; ax = word for and/or/xor 
  4824 0000EA7C 890D[64030300]      <1> 	mov	[u.r0], ecx ; return with
  4825                              <1> 			   ; byte count of display page
  4826                              <1> 			   ; (eax > 0 -> OK)
  4827 0000EA82 D1E9                <1> 	shr	ecx, 1 ; word count
  4828                              <1> 	
  4829 0000EA84 80FB0A              <1> 	cmp	bl, 10
  4830 0000EA87 722B                <1> 	jb	short sysvideo_15_67 ; 7, 8, 9
  4831 0000EA89 740E                <1> 	je	short sysvideo_15_64 ; 10
  4832 0000EA8B 80FB0C              <1> 	cmp	bl, 12
  4833 0000EA8E 7212                <1> 	jb	short sysvideo_15_65 ; 11
  4834 0000EA90 7419                <1> 	je	short sysvideo_15_66 ; 12
  4835                              <1> 
  4836                              <1> 	; BL = 13 = NOT display page words
  4837 0000EA92 D1E9                <1> 	shr	ecx, 1 ; dword count
  4838                              <1> 	; 27/12/2020
  4839 0000EA94 E945FEFFFF          <1> 	jmp	sysvideo_15_46
  4840                              <1> 
  4841                              <1> 	; BL = 10 = INC display page words
  4842                              <1> sysvideo_15_64:
  4843 0000EA99 66FF06              <1> 	inc	word [esi]
  4844 0000EA9C 46                  <1> 	inc	esi
  4845 0000EA9D 46                  <1> 	inc	esi
  4846 0000EA9E E2F9                <1> 	loop	sysvideo_15_64
  4847 0000EAA0 EB38                <1> 	jmp	short sysvideo_15_71
  4848                              <1> 
  4849                              <1> 	; BL = 11 = DEC display page words
  4850                              <1> sysvideo_15_65:
  4851 0000EAA2 66FF0E              <1> 	dec	word [esi]
  4852 0000EAA5 46                  <1> 	inc	esi
  4853 0000EAA6 46                  <1> 	inc	esi
  4854 0000EAA7 E2F9                <1> 	loop	sysvideo_15_65
  4855 0000EAA9 EB2F                <1> 	jmp	short sysvideo_15_71
  4856                              <1> 
  4857                              <1> 	; BL = 12 = NEG display page words
  4858                              <1> sysvideo_15_66:
  4859 0000EAAB 66F71E              <1> 	neg	word [esi]
  4860 0000EAAE 46                  <1> 	inc	esi
  4861 0000EAAF 46                  <1> 	inc	esi
  4862 0000EAB0 E2F9                <1> 	loop	sysvideo_15_66
  4863 0000EAB2 EB26                <1> 	jmp	short sysvideo_15_71
  4864                              <1> 
  4865                              <1> sysvideo_15_67:
  4866                              <1> 	; bl = 7, 8, 9
  4867                              <1> 	; ecx = byte (pixel) count
  4868 0000EAB4 C1E902              <1> 	shr	ecx, 2 ; dword count
  4869 0000EAB7 6689C2              <1> 	mov	dx, ax
  4870 0000EABA C1E210              <1> 	shl	edx, 16 
  4871 0000EABD 6689C2              <1> 	mov	dx, ax
  4872                              <1> 		 ; edx = 2 words for and/or/xor
  4873                              <1> 
  4874 0000EAC0 80FB08              <1> 	cmp	bl, 8
  4875 0000EAC3 7409                <1> 	je	short sysvideo_15_69
  4876 0000EAC5 770E                <1> 	ja	short sysvideo_15_70
  4877                              <1> 
  4878                              <1> 	; BL = 7 = AND display page words with CX
  4879                              <1> sysvideo_15_68:
  4880 0000EAC7 2116                <1> 	and	[esi], edx
  4881 0000EAC9 AD                  <1> 	lodsd
  4882 0000EACA E2FB                <1> 	loop	sysvideo_15_68
  4883                              <1> 	;jmp	sysret	
  4884 0000EACC EB0C                <1> 	jmp	short sysvideo_15_71
  4885                              <1> 
  4886                              <1> 	; BL = 8 = OR display page words with CX
  4887                              <1> sysvideo_15_69:
  4888 0000EACE 0916                <1> 	or	[esi], edx
  4889 0000EAD0 AD                  <1> 	lodsd
  4890 0000EAD1 E2FB                <1> 	loop	sysvideo_15_69
  4891                              <1> 	;jmp	sysret	
  4892 0000EAD3 EB05                <1> 	jmp	short sysvideo_15_71
  4893                              <1> 
  4894                              <1> 	; BL = 9 = XOR display page words with CX
  4895                              <1> sysvideo_15_70:
  4896 0000EAD5 3116                <1> 	xor	[esi], edx
  4897 0000EAD7 AD                  <1> 	lodsd
  4898 0000EAD8 E2FB                <1> 	loop	sysvideo_15_70
  4899                              <1> sysvideo_15_71:
  4900 0000EADA E90DEEFFFF          <1> 	jmp	sysret
  4901                              <1> 
  4902                              <1> sysvideo_15_72:
  4903                              <1> 	; 27/12/2020
  4904                              <1> 	; edx = 0
  4905                              <1> 
  4906                              <1> 	; bh = bits per pixel (bpp) = 32
  4907                              <1> 
  4908                              <1> 	; eax = linear frame buffer (VIDEO PAGE) pixel count
  4909                              <1> 	;	(a quarter of video page size in bytes)
  4910                              <1> 
  4911 0000EADF C1E002              <1> 	shl	eax, 2 ; byte count = 4 * pixel count 
  4912                              <1> 
  4913                              <1> 	; sub function for sysvideo function bh = 2
  4914 0000EAE2 20DB                <1> 	and	bl, bl ; 0 ?
  4915 0000EAE4 7511                <1> 	jnz	short sysvideo_15_73 ; no
  4916                              <1> 
  4917                              <1> 	; BL = 0 = Fill color (color in ECX)
  4918                              <1> 
  4919 0000EAE6 5F                  <1> 	pop	edi ; * ; LFB address
  4920                              <1> 
  4921 0000EAE7 A3[64030300]        <1> 	mov	[u.r0], eax ; return value to user
  4922                              <1> 
  4923 0000EAEC 91                  <1> 	xchg	eax, ecx ; eax = color, ecx = pixel count
  4924                              <1> 
  4925                              <1> 	; 32 bit pixels
  4926 0000EAED C1E902              <1> 	shr	ecx, 2
  4927                              <1> 	; ecx = pixel count
  4928                              <1> 
  4929 0000EAF0 F3AB                <1> 	rep	stosd
  4930                              <1> 
  4931                              <1> 	; [u.r0] = transfer (fill) count in bytes
  4932 0000EAF2 E9F5EDFFFF          <1> 	jmp	sysret
  4933                              <1> 
  4934                              <1> sysvideo_15_73:
  4935                              <1> 	; 27/12/2020
  4936                              <1> 
  4937                              <1> 	; eax = linear frame buffer (VIDEO PAGE) byte count
  4938                              <1> 	;       (4 * pixel count) 
  4939                              <1> 
  4940 0000EAF7 80FB02              <1> 	cmp	bl, 2	
  4941 0000EAFA 7725                <1> 	ja	short sysvideo_15_78
  4942 0000EAFC 7217                <1> 	jb	short sysvideo_15_76
  4943                              <1> 
  4944                              <1> 	; BL = 2 = system to user video/display page transfer
  4945 0000EAFE 5E                  <1> 	pop	esi ; * ; LFB address
  4946 0000EAFF 89CF                <1> 	mov	edi, ecx ; user's buffer
  4947                              <1> sysvideo_15_74:
  4948 0000EB01 89C1                <1> 	mov	ecx, eax ; LFB video page byte count
  4949 0000EB03 E8BC270000          <1> 	call	transfer_to_user_buffer ; fast transfer
  4950                              <1> sysvideo_15_75:
  4951                              <1> 	;jc	sysret ; [u.r0] = 0
  4952 0000EB08 72D0                <1> 	jc	short sysvideo_15_71
  4953 0000EB0A 890D[64030300]      <1> 	mov	[u.r0], ecx ; actual transfer count	
  4954 0000EB10 E9D7EDFFFF          <1> 	jmp	sysret
  4955                              <1> 
  4956                              <1> sysvideo_15_76:
  4957                              <1> 	; BL = 1 = user to system video/display page transfer
  4958 0000EB15 5F                  <1> 	pop	edi ; * ; LFB address
  4959 0000EB16 89CE                <1> 	mov	esi, ecx ; user's buffer
  4960                              <1> sysvideo_15_77:
  4961 0000EB18 89C1                <1> 	mov	ecx, eax ; LFB video page byte count
  4962 0000EB1A E8EF270000          <1> 	call	transfer_from_user_buffer ; fast transfer
  4963 0000EB1F EBE7                <1> 	jmp	short sysvideo_15_75
  4964                              <1> 
  4965                              <1> sysvideo_15_78:
  4966 0000EB21 80FB03              <1> 	cmp	bl, 3
  4967 0000EB24 7776                <1> 	ja	short sysvideo_15_84
  4968                              <1> 
  4969                              <1> 	; BL = 3 = NOT bits in window (ECX, EDX)
  4970 0000EB26 5E                  <1> 	pop	esi ; * ; LFB address
  4971                              <1> 
  4972 0000EB27 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  4973 0000EB29 7318                <1> 	jnb	short sysvideo_15_80 ; window
  4974                              <1> 
  4975 0000EB2B 09D2                <1> 	or	edx, edx
  4976 0000EB2D 7568                <1> 	jnz	short sysvideo_15_83  ; invalid !
  4977                              <1> 
  4978                              <1> 	; full screen (update) ; edx = 0, ecx > 0
  4979 0000EB2F 89C1                <1> 	mov	ecx, eax ; LFB video page byte count
  4980 0000EB31 A3[64030300]        <1> 	mov	[u.r0], eax
  4981 0000EB36 C1E902              <1> 	shr	ecx, 2  ; dword 'NOT'
  4982                              <1> sysvideo_15_79:
  4983 0000EB39 F716                <1> 	not	dword [esi]
  4984 0000EB3B AD                  <1> 	lodsd	; add esi, 4
  4985 0000EB3C E2FB                <1> 	loop	sysvideo_15_79
  4986 0000EB3E E9A9EDFFFF          <1> 	jmp	sysret
  4987                              <1> 
  4988                              <1> sysvideo_15_80:
  4989                              <1> 	; 29/12/2020
  4990                              <1> 	; fix dx to bp-1 if dx >= bp
  4991 0000EB43 E8E10F0000          <1> 	call	sysvideo_15_200
  4992                              <1> 	;
  4993                              <1> 	; 29/12/2020
  4994 0000EB48 6639CA              <1> 	cmp	dx, cx
  4995 0000EB4B 724A                <1>         jb      short sysvideo_15_83 ; invalid
  4996                              <1> 
  4997 0000EB4D 89F7                <1> 	mov	edi, esi
  4998 0000EB4F 01C7                <1> 	add	edi, eax ; end dword of video page + 4
  4999 0000EB51 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  5000 0000EB54 6629C8              <1> 	sub	ax, cx  ; - top left column
  5001 0000EB57 40                  <1> 	inc	eax ; same column no == 1 column	 
  5002 0000EB58 50                  <1> 	push	eax ; pixel count per window row
  5003 0000EB59 52                  <1> 	push	edx
  5004                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  5005                              <1> 	; 30/12/2020
  5006                              <1> 	; calculate start offset
  5007 0000EB5A E8D50F0000          <1> 	call	sysvideo_15_202
  5008 0000EB5F C1E002              <1> 	shl	eax, 2	; pixel pos -> byte pos
  5009 0000EB62 01C6                <1> 	add	esi, eax ; start address 
  5010 0000EB64 59                  <1> 	pop	ecx ; edx
  5011                              <1> 	; 30/12/2020
  5012                              <1> 	; calculate start offset
  5013 0000EB65 E8CC0F0000          <1> 	call	sysvideo_15_203
  5014 0000EB6A C1E002              <1> 	shl	eax, 2	; pixel pos -> byte pos
  5015 0000EB6D 5A                  <1> 	pop	edx ; pixel count per window row
  5016                              <1> 	; eax = the last byte to be converted 
  5017 0000EB6E 01F0                <1> 	add	eax, esi
  5018 0000EB70 39C7                <1> 	cmp	edi, eax
  5019 0000EB72 7623                <1> 	jna	short sysvideo_15_83 ; out of video page
  5020 0000EB74 89C7                <1> 	mov	edi, eax ; stop address
  5021                              <1> 	
  5022 0000EB76 29D3                <1> 	sub	ebx, edx
  5023 0000EB78 C1E302              <1> 	shl	ebx, 2 ; pixel count -> byte count
  5024 0000EB7B C1E202              <1> 	shl	edx, 2 ; byte count
  5025 0000EB7E 83EE04              <1> 	sub	esi, 4
  5026                              <1> sysvideo_15_81:
  5027 0000EB81 89D1                <1> 	mov	ecx, edx ; window width (byte count)
  5028 0000EB83 C1E902              <1> 	shr	ecx, 2
  5029                              <1> sysvideo_15_82:
  5030 0000EB86 AD                  <1> 	lodsd
  5031 0000EB87 F716                <1> 	not	dword [esi]
  5032 0000EB89 E2FB                <1> 	loop	sysvideo_15_82
  5033 0000EB8B 0115[64030300]      <1> 	add	[u.r0], edx ; 1 pixel = 4 bytes
  5034 0000EB91 01DE                <1> 	add	esi, ebx ; add difference for next row
  5035                              <1> 	;
  5036 0000EB93 39FE                <1> 	cmp	esi, edi ; stop address (included in loop)
  5037 0000EB95 76EA                <1> 	jna	short sysvideo_15_81
  5038                              <1> sysvideo_15_83:
  5039 0000EB97 E950EDFFFF          <1> 	jmp	sysret	
  5040                              <1> 
  5041                              <1> sysvideo_15_84:
  5042 0000EB9C 80FB04              <1> 	cmp	bl, 4
  5043 0000EB9F 0F8783000000        <1>         ja	sysvideo_15_88
  5044                              <1> 
  5045                              <1> 	; BL = 4 = window copy (system to system)
  5046                              <1> 
  5047                              <1> 	; eax = LFB video page byte count 
  5048                              <1> 	;	(4 * pixel count)
  5049                              <1> 
  5050 0000EBA5 5B                  <1> 	pop	ebx ; * ; LFB address
  5051                              <1> 
  5052 0000EBA6 39DE                <1> 	cmp	esi, ebx
  5053 0000EBA8 72ED                <1> 	jb	short sysvideo_15_83
  5054                              <1> 
  5055 0000EBAA 39DF                <1> 	cmp	edi, ebx
  5056 0000EBAC 72E9                <1> 	jb	short sysvideo_15_83
  5057 0000EBAE 01C3                <1> 	add	ebx, eax ; **
  5058 0000EBB0 39DE                <1> 	cmp	esi, ebx
  5059 0000EBB2 73E3                <1> 	jnb	short sysvideo_15_83
  5060 0000EBB4 39DF                <1> 	cmp	edi, ebx
  5061 0000EBB6 73DF                <1> 	jnb	short sysvideo_15_83
  5062                              <1> 	
  5063 0000EBB8 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  5064 0000EBBA 7315                <1> 	jnb	short sysvideo_15_85 ; window
  5065                              <1> 
  5066 0000EBBC 09D2                <1> 	or	edx, edx
  5067 0000EBBE 75D7                <1> 	jnz	short sysvideo_15_83 ; invalid !
  5068                              <1> 
  5069 0000EBC0 A3[64030300]        <1> 	mov	[u.r0], eax
  5070 0000EBC5 89C1                <1> 	mov	ecx, eax ; byte count
  5071 0000EBC7 C1E902              <1> 	shr	ecx, 2
  5072                              <1> 	; full screen copy ; edx = 0, ecx > 0
  5073 0000EBCA F3A5                <1> 	rep	movsd
  5074 0000EBCC E91BEDFFFF          <1> 	jmp	sysret
  5075                              <1> sysvideo_15_85:
  5076                              <1> 	; 29/12/2020
  5077                              <1> 	; fix dx to bp-1 if dx >= bp
  5078 0000EBD1 E8530F0000          <1> 	call	sysvideo_15_200
  5079                              <1> 	;
  5080                              <1> 	; 29/12/2020
  5081 0000EBD6 6639CA              <1> 	cmp	dx, cx
  5082 0000EBD9 72BC                <1>         jb      short sysvideo_15_83 ; invalid	
  5083                              <1> 
  5084 0000EBDB 53                  <1> 	push	ebx ; end dword of video page + 4
  5085 0000EBDC 29C3                <1> 	sub	ebx, eax ; **
  5086 0000EBDE 53                  <1> 	push	ebx ; LFB start/base address
  5087                              <1> 
  5088 0000EBDF 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  5089 0000EBE2 6629C8              <1> 	sub	ax, cx  ; - top left column
  5090 0000EBE5 40                  <1> 	inc	eax ; same column no == 1 column	 
  5091 0000EBE6 50                  <1> 	push	eax ; pixel count per window row
  5092 0000EBE7 52                  <1> 	push	edx
  5093                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  5094                              <1> 	; 30/12/2020
  5095                              <1> 	; calculate start offset
  5096 0000EBE8 E8470F0000          <1> 	call	sysvideo_15_202
  5097 0000EBED C1E002              <1> 	shl	eax, 2 ; pixel pos -> byte pos
  5098 0000EBF0 01C7                <1> 	add	edi, eax ; start address 
  5099 0000EBF2 01C6                <1> 	add	esi, eax
  5100 0000EBF4 59                  <1> 	pop	ecx ; edx
  5101                              <1> 	; 30/12/2020
  5102                              <1> 	; calculate start offset
  5103 0000EBF5 E83C0F0000          <1> 	call	sysvideo_15_203
  5104 0000EBFA C1E002              <1> 	shl	eax, 2 ; pixel pos -> byte pos
  5105 0000EBFD 5A                  <1> 	pop	edx ; pixel count per window row
  5106 0000EBFE 59                  <1> 	pop	ecx ; LFB start/base address
  5107 0000EBFF 01C8                <1> 	add	eax, ecx ; stop address
  5108 0000EC01 59                  <1> 	pop	ecx ; the last dword of LFB + 4
  5109 0000EC02 39C8                <1> 	cmp	eax, ecx
  5110 0000EC04 7391                <1> 	jnb	short sysvideo_15_83
  5111                              <1> 	
  5112                              <1> 	;push	edi ; start address
  5113                              <1> 	;push	eax ; stop address (included)
  5114 0000EC06 29D3                <1> 	sub	ebx, edx ; screen width - window width
  5115 0000EC08 C1E302              <1> 	shl	ebx, 2 ; pixel count -> byte count
  5116 0000EC0B C1E202              <1> 	shl	edx, 2 ; pixel count -> byte count
  5117                              <1> sysvideo_15_86:
  5118 0000EC0E 89D1                <1> 	mov	ecx, edx
  5119 0000EC10 C1E902              <1> 	shr	ecx, 2
  5120 0000EC13 F3A5                <1> 	rep	movsd
  5121 0000EC15 0115[64030300]      <1> 	add	[u.r0], edx ; 1 pixel = 4 bytes
  5122                              <1> 	;or	ebx, ebx
  5123                              <1> 	;jz	short sysvideo_15_87
  5124 0000EC1B 01DF                <1> 	add	edi, ebx ; add difference (for next row) 
  5125 0000EC1D 01DE                <1> 	add	esi, ebx
  5126                              <1> ;sysvideo_15_87:
  5127                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  5128 0000EC1F 39C7                <1> 	cmp	edi, eax
  5129 0000EC21 76EB                <1> 	jna	short sysvideo_15_86
  5130                              <1> sysvideo_15_87:
  5131                              <1> 	;pop	ebx ; stop address
  5132                              <1> 	;pop	edi ; start address
  5133 0000EC23 E9C4ECFFFF          <1> 	jmp	sysret
  5134                              <1> 
  5135                              <1> sysvideo_15_88:
  5136 0000EC28 80FB05              <1> 	cmp	bl, 5
  5137 0000EC2B 775E                <1>         ja      short sysvideo_15_93
  5138                              <1> 
  5139                              <1> 	; BL = 5 = window copy (user to system)
  5140                              <1> 
  5141                              <1> 	; eax = LFB video page byte count 
  5142                              <1> 	;	(4 * pixel count)
  5143                              <1> 
  5144 0000EC2D 5F                  <1> 	pop	edi ; * ; LFB address
  5145                              <1> 
  5146                              <1> 	; esi = user buffer (in user's memory space)
  5147 0000EC2E 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  5148 0000EC30 7309                <1>       	jnb	short sysvideo_15_89 ; window
  5149                              <1> 
  5150 0000EC32 09D2                <1> 	or	edx, edx
  5151                              <1> 	;jnz	sysret  ; invalid !
  5152 0000EC34 75ED                <1> 	jnz	short sysvideo_15_87
  5153                              <1> 
  5154                              <1> 	; full screen copy ; edx = 0, ecx > 0
  5155 0000EC36 E9DDFEFFFF          <1> 	jmp	sysvideo_15_77 ; full screen copy
  5156                              <1> 
  5157                              <1> sysvideo_15_89:
  5158                              <1> 	; 29/12/2020
  5159                              <1> 	; fix dx to bp-1 if dx >= bp
  5160 0000EC3B E8E90E0000          <1> 	call	sysvideo_15_200
  5161                              <1> 	;
  5162                              <1> 	; 29/12/2020
  5163 0000EC40 6639CA              <1> 	cmp	dx, cx
  5164 0000EC43 72DE                <1> 	jb	short sysvideo_15_87
  5165                              <1> 	
  5166                              <1> 	; 01/01/2021
  5167 0000EC45 01F8                <1> 	add	eax, edi
  5168 0000EC47 50                  <1> 	push	eax ; the last dword of LFB + 4 
  5169 0000EC48 57                  <1> 	push	edi ; LFB start/base address
  5170                              <1> 
  5171 0000EC49 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  5172 0000EC4C 6629C8              <1> 	sub	ax, cx  ; - top left column
  5173 0000EC4F 40                  <1> 	inc	eax ; same column no == 1 column	 
  5174 0000EC50 50                  <1> 	push	eax ; pixel count per window row
  5175                              <1> 
  5176 0000EC51 52                  <1> 	push	edx
  5177                              <1> 	; 30/12/2020
  5178                              <1> 	; calculate start offset
  5179 0000EC52 E8DD0E0000          <1> 	call	sysvideo_15_202
  5180 0000EC57 C1E002              <1> 	shl	eax, 2 ; pixel pos -> byte pos
  5181 0000EC5A 01C7                <1> 	add	edi, eax ; start address 
  5182 0000EC5C 59                  <1> 	pop	ecx ; edx
  5183                              <1> 	; 30/12/2020
  5184                              <1> 	; calculate end offset
  5185 0000EC5D E8D40E0000          <1> 	call	sysvideo_15_203
  5186 0000EC62 C1E002              <1> 	shl	eax, 2 ; pixel pos -> byte pos
  5187 0000EC65 5A                  <1> 	pop	edx ; pixel count per window row
  5188 0000EC66 59                  <1> 	pop	ecx ; LFB start/base address
  5189 0000EC67 01C8                <1> 	add	eax, ecx ; stop address
  5190 0000EC69 59                  <1> 	pop	ecx ; the last dword of LFB + 4
  5191 0000EC6A 39C8                <1> 	cmp	eax, ecx
  5192                              <1> 	;jnb	sysret
  5193 0000EC6C 73B5                <1> 	jnb	short sysvideo_15_87
  5194                              <1> 
  5195                              <1> 	; 29/12/220
  5196 0000EC6E C1E302              <1> 	shl	ebx, 2 ; from pixel count to byte count 
  5197 0000EC71 C1E202              <1> 	shl	edx, 2 ; pixel count -> byte count 
  5198                              <1> 	;push	edi ; start address 
  5199 0000EC74 50                  <1> 	push	eax ; stop address (included)
  5200                              <1> sysvideo_15_90:
  5201 0000EC75 89D1                <1> 	mov	ecx, edx ; byte count
  5202                              <1> 	; user to system video/display page window transfer
  5203                              <1> 	; esi =	user buffer
  5204 0000EC77 E892260000          <1> 	call	transfer_from_user_buffer ; fast transfer
  5205 0000EC7C 7207                <1> 	jc	short sysvideo_15_91
  5206                              <1> 		; ecx = actual transfer count (= ecx input) 
  5207                              <1> 	;add	[u.r0], ecx
  5208                              <1> 	;add	edi, ebx ; next row in video memory window
  5209                              <1> 	;add	esi, ecx ; next window row in user's buffer
  5210                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  5211                              <1> 	; 30/12/2020
  5212 0000EC7E E8C00E0000          <1> 	call	sysvideo_15_204
  5213 0000EC83 76F0                <1> 	jna	short sysvideo_15_90
  5214                              <1> sysvideo_15_91:
  5215 0000EC85 5B                  <1> 	pop	ebx ; stop address
  5216                              <1> 	;pop	edi ; start address
  5217                              <1> sysvideo_15_92:
  5218 0000EC86 E961ECFFFF          <1> 	jmp	sysret
  5219                              <1> 
  5220                              <1> sysvideo_15_93:
  5221 0000EC8B 80FB06              <1> 	cmp	bl, 6
  5222 0000EC8E 775E                <1> 	ja	short sysvideo_15_96
  5223                              <1> 
  5224                              <1> 	; BL = 6 = window copy (system to user)
  5225                              <1> 
  5226                              <1> 	; eax = LFB video page byte count 
  5227                              <1> 	;	(4 * pixel count)
  5228                              <1> 
  5229 0000EC90 89F7                <1> 	mov	edi, esi ; user buffer
  5230                              <1> 
  5231 0000EC92 5E                  <1> 	pop	esi ; * ; LFB address
  5232                              <1> 
  5233                              <1> 	; edi = user buffer (in user's memory space)
  5234 0000EC93 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  5235 0000EC95 7309                <1>         jnb     short sysvideo_15_94
  5236                              <1> 	
  5237 0000EC97 21D2                <1> 	and	edx, edx
  5238                              <1> 	;jnz	sysret	; invalid !
  5239 0000EC99 75EB                <1> 	jnz	short sysvideo_15_92
  5240                              <1> 
  5241                              <1> 	; full screen copy  ; edx = 0, ecx > 0
  5242 0000EC9B E961FEFFFF          <1> 	jmp	sysvideo_15_74
  5243                              <1> 
  5244                              <1> sysvideo_15_94:
  5245                              <1> 	; 29/12/2020
  5246                              <1> 	; fix dx to bp-1 if dx >= bp
  5247 0000ECA0 E8840E0000          <1> 	call	sysvideo_15_200
  5248                              <1> 	;
  5249                              <1> 	; 29/12/2020
  5250 0000ECA5 6639CA              <1> 	cmp	dx, cx
  5251 0000ECA8 72DC                <1> 	jb	short sysvideo_15_92	
  5252                              <1> 
  5253 0000ECAA 89F3                <1> 	mov	ebx, esi ; LFB address
  5254 0000ECAC 01D8                <1> 	add	eax, ebx
  5255 0000ECAE 50                  <1> 	push	eax ; the last dword of LFB + 4 
  5256 0000ECAF 53                  <1> 	push	ebx ; LFB start/base address
  5257                              <1> 
  5258 0000ECB0 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  5259 0000ECB3 6629C8              <1> 	sub	ax, cx  ; - top left column
  5260 0000ECB6 40                  <1> 	inc	eax ; same column no == 1 column	 
  5261 0000ECB7 50                  <1> 	push	eax ; pixel count per window row
  5262                              <1> 
  5263 0000ECB8 52                  <1> 	push	edx
  5264                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  5265                              <1> 	; 30/12/2020
  5266                              <1> 	; calculate start offset
  5267 0000ECB9 E8760E0000          <1> 	call	sysvideo_15_202
  5268 0000ECBE C1E002              <1> 	shl	eax, 2 ; pixel pos -> byte pos
  5269 0000ECC1 01C6                <1> 	add	esi, eax ; start address 
  5270 0000ECC3 59                  <1> 	pop	ecx ; edx
  5271                              <1> 	; 30/12/2020
  5272                              <1> 	; calculate end offset
  5273 0000ECC4 E86D0E0000          <1> 	call	sysvideo_15_203
  5274 0000ECC9 C1E002              <1> 	shl	eax, 2 ; pixel pos -> byte pos
  5275 0000ECCC 5A                  <1> 	pop	edx ; pixel count per window row
  5276 0000ECCD 59                  <1> 	pop	ecx ; LFB start/base address
  5277 0000ECCE 01C8                <1> 	add	eax, ecx ; stop address
  5278 0000ECD0 59                  <1> 	pop	ecx ; the last dword of LFB + 4
  5279 0000ECD1 39C8                <1> 	cmp	eax, ecx
  5280                              <1> 	;jnb	sysret
  5281 0000ECD3 73B1                <1> 	jnb	short sysvideo_15_92
  5282                              <1> 	
  5283                              <1> 	; 29/12/2020
  5284 0000ECD5 C1E302              <1> 	shl	ebx, 2 ; from pixel count to byte count 
  5285 0000ECD8 C1E202              <1> 	shl	edx, 2 ; pixel count -> byte count 
  5286                              <1> 	;push	esi ; start address 
  5287 0000ECDB 50                  <1> 	push	eax ; stop address (included)
  5288                              <1> sysvideo_15_95:
  5289 0000ECDC 89D1                <1> 	mov	ecx, edx ; byte count
  5290                              <1> 	; user to system video/display page window transfer
  5291                              <1> 	; esi =	user buffer
  5292 0000ECDE E8E1250000          <1> 	call	transfer_to_user_buffer ; fast transfer
  5293                              <1> 	;jc	short sysvideo_15_95_0
  5294 0000ECE3 72A0                <1> 	jc	short sysvideo_15_91
  5295                              <1> 	;add	[u.r0], ecx
  5296                              <1> 	;add	edi, ebx ; next row in video memory window
  5297                              <1> 	;add	esi, ecx ; next window row in user's buffer
  5298                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  5299                              <1> 	; 30/12/2020
  5300 0000ECE5 E8590E0000          <1> 	call	sysvideo_15_204
  5301 0000ECEA 76F0                <1> 	jna	short sysvideo_15_95
  5302 0000ECEC EB97                <1> 	jmp	short sysvideo_15_91
  5303                              <1> 
  5304                              <1> sysvideo_15_96:
  5305                              <1> 	; bl = 7, 8, 9, 10, 11, 12, 13
  5306                              <1> 	; (bl > 13 is invalid for current kernel version)
  5307                              <1> 
  5308                              <1> 	;cmp	bl, 13
  5309                              <1> 	;ja	short sysvideo_15_91
  5310                              <1> 
  5311                              <1> 	; 01/01/2021
  5312 0000ECEE 80FB0E              <1> 	cmp	bl, 14
  5313 0000ECF1 0F8372050000        <1> 	jnb	sysvideo_15_164
  5314                              <1> 
  5315                              <1> 	; eax = LFB video page size (w*h*4) in bytes
  5316                              <1> 
  5317 0000ECF7 5E                  <1> 	pop	esi ; * ; LFB base/start address
  5318 0000ECF8 91                  <1> 	xchg	eax, ecx ; ecx = byte count
  5319                              <1> 			 ; eax = dword for and/or/xor 
  5320 0000ECF9 890D[64030300]      <1> 	mov	[u.r0], ecx ; return with
  5321                              <1> 			   ; byte count of display page
  5322                              <1> 			   ; (eax > 0 -> OK)
  5323 0000ECFF C1E902              <1> 	shr	ecx, 2 ; dword count
  5324                              <1> 	
  5325 0000ED02 80FB0A              <1> 	cmp	bl, 10
  5326 0000ED05 7223                <1> 	jb	short sysvideo_15_100 ; 7, 8, 9
  5327 0000ED07 740C                <1> 	je	short sysvideo_15_97 ; 10
  5328 0000ED09 80FB0C              <1> 	cmp	bl, 12
  5329 0000ED0C 720E                <1> 	jb	short sysvideo_15_98 ; 11
  5330 0000ED0E 7413                <1> 	je	short sysvideo_15_99 ; 12
  5331                              <1> 
  5332                              <1> 	; BL = 13 = NOT display page dwords
  5333                              <1> 
  5334 0000ED10 E924FEFFFF          <1> 	jmp	sysvideo_15_79
  5335                              <1> 
  5336                              <1> 	; BL = 10 = INC display page dwords
  5337                              <1> sysvideo_15_97:
  5338 0000ED15 FF06                <1> 	inc	dword [esi]
  5339 0000ED17 AD                  <1> 	lodsd
  5340 0000ED18 E2FB                <1> 	loop	sysvideo_15_97
  5341 0000ED1A EB2A                <1> 	jmp	short sysvideo_15_104
  5342                              <1> 
  5343                              <1> 	; BL = 11 = DEC display page dwords
  5344                              <1> sysvideo_15_98:
  5345 0000ED1C FF0E                <1> 	dec	dword [esi]
  5346 0000ED1E AD                  <1> 	lodsd
  5347 0000ED1F E2FB                <1> 	loop	sysvideo_15_98
  5348 0000ED21 EB23                <1> 	jmp	short sysvideo_15_104
  5349                              <1> 
  5350                              <1> 	; BL = 12 = NEG display page dwords
  5351                              <1> sysvideo_15_99:
  5352 0000ED23 F71E                <1> 	neg	dword [esi]
  5353 0000ED25 AD                  <1> 	lodsd
  5354 0000ED26 E2FB                <1> 	loop	sysvideo_15_99
  5355 0000ED28 EB1C                <1> 	jmp	short sysvideo_15_104
  5356                              <1> 
  5357                              <1> sysvideo_15_100:
  5358                              <1> 	; bl = 7, 8, 9
  5359                              <1> 	; ecx = pixel count
  5360 0000ED2A 89C2                <1> 	mov	edx, eax
  5361                              <1> 		 ; edx = dword for and/or/xor
  5362                              <1> 
  5363 0000ED2C 80FB08              <1> 	cmp	bl, 8
  5364 0000ED2F 7409                <1> 	je	short sysvideo_15_102
  5365 0000ED31 770E                <1> 	ja	short sysvideo_15_103
  5366                              <1> 
  5367                              <1> 	; BL = 7 = AND display page dwords with ECX
  5368                              <1> sysvideo_15_101:
  5369 0000ED33 2116                <1> 	and	[esi], edx
  5370 0000ED35 AD                  <1> 	lodsd
  5371 0000ED36 E2FB                <1> 	loop	sysvideo_15_101
  5372                              <1> 	;jmp	sysret	
  5373 0000ED38 EB0C                <1> 	jmp	short sysvideo_15_104
  5374                              <1> 
  5375                              <1> 	; BL = 8 = OR display page dwords with ECX
  5376                              <1> sysvideo_15_102:
  5377 0000ED3A 0916                <1> 	or	[esi], edx
  5378 0000ED3C AD                  <1> 	lodsd
  5379 0000ED3D E2FB                <1> 	loop	sysvideo_15_102
  5380                              <1> 	;jmp	sysret	
  5381 0000ED3F EB05                <1> 	jmp	short sysvideo_15_104
  5382                              <1> 
  5383                              <1> 	; BL = 9 = XOR display page dwords with ECX
  5384                              <1> sysvideo_15_103:
  5385 0000ED41 3116                <1> 	xor	[esi], edx
  5386 0000ED43 AD                  <1> 	lodsd
  5387 0000ED44 E2FB                <1> 	loop	sysvideo_15_103
  5388                              <1> sysvideo_15_104:
  5389 0000ED46 E9A1EBFFFF          <1> 	jmp	sysret
  5390                              <1> 
  5391                              <1> sysvideo_15_105:
  5392                              <1> 	; bh = bits per pixel (bpp) = 24
  5393                              <1> 
  5394                              <1> 	; eax = linear frame buffer (VIDEO PAGE) pixel count
  5395                              <1> 	;	(1/3 of video page size in bytes)
  5396                              <1> 	
  5397 0000ED4B 52                  <1> 	push	edx
  5398 0000ED4C 89C2                <1> 	mov	edx, eax
  5399 0000ED4E D1E2                <1> 	shl	edx, 1 ; * 2
  5400 0000ED50 01D0                <1> 	add	eax, edx ; * 3 (24 bits per pixel)
  5401 0000ED52 5A                  <1> 	pop	edx
  5402                              <1> 	
  5403                              <1> 	; eax = LFB video page byte count (3 * pixel count)
  5404                              <1> 
  5405                              <1> 	; sub function for sysvideo function bh = 2
  5406 0000ED53 20DB                <1> 	and	bl, bl ; 0 ?
  5407 0000ED55 751B                <1> 	jnz	short sysvideo_15_106 ; no
  5408                              <1> 
  5409                              <1> 	; BL = 0 = Fill color (color in ECX)
  5410                              <1> 
  5411 0000ED57 5F                  <1> 	pop	edi ; * ; LFB address
  5412                              <1> 
  5413 0000ED58 A3[64030300]        <1> 	mov	[u.r0], eax ; return value to user
  5414                              <1> 
  5415 0000ED5D 91                  <1> 	xchg	eax, ecx ; eax = color, ecx = pixel count
  5416                              <1> 
  5417                              <1> 	; clear bits 24 to 31 even if they are not zero 
  5418                              <1> 	;and	eax, 0FFFFFFh
  5419                              <1> 
  5420                              <1> 	; 24 bit pixels
  5421                              <1> 
  5422                              <1> 	; ecx = byte count
  5423                              <1> 
  5424 0000ED5E 89C3                <1> 	mov	ebx, eax
  5425 0000ED60 C1EB10              <1> 	shr	ebx, 16
  5426                              <1> 
  5427                              <1> sysvideo_15_105_0:
  5428 0000ED63 66AB                <1> 	stosw	; ax
  5429 0000ED65 881F                <1> 	mov	[edi], bl ; bit 16 to 23 of eax
  5430 0000ED67 47                  <1> 	inc	edi
  5431 0000ED68 83E903              <1> 	sub	ecx, 3
  5432                              <1> 	;jnz	short sysvideo_15_105_0
  5433 0000ED6B 77F6                <1> 	ja	short sysvideo_15_105_0
  5434                              <1> 
  5435                              <1> 	; [u.r0] = transfer (fill) count in bytes
  5436 0000ED6D E97AEBFFFF          <1> 	jmp	sysret
  5437                              <1> 
  5438                              <1> sysvideo_15_106:
  5439                              <1> 	; 27/12/2020
  5440                              <1> 
  5441                              <1> 	; eax = linear frame buffer (VIDEO PAGE) byte count
  5442                              <1> 	;       (3 * pixel count) 
  5443                              <1> 	
  5444 0000ED72 80FB02              <1> 	cmp	bl, 2	
  5445 0000ED75 7725                <1> 	ja	short sysvideo_15_111
  5446 0000ED77 7217                <1> 	jb	short sysvideo_15_109
  5447                              <1> 
  5448                              <1> 	; BL = 2 = system to user video/display page transfer
  5449 0000ED79 5E                  <1> 	pop	esi ; * ; LFB address
  5450 0000ED7A 89CF                <1> 	mov	edi, ecx ; user's buffer
  5451                              <1> sysvideo_15_107:
  5452 0000ED7C 89C1                <1> 	mov	ecx, eax ; LFB video page byte count
  5453 0000ED7E E841250000          <1> 	call	transfer_to_user_buffer ; fast transfer
  5454                              <1> sysvideo_15_108:
  5455                              <1> 	;jc	sysret ; [u.r0] = 0
  5456 0000ED83 72C1                <1> 	jc	short sysvideo_15_104
  5457 0000ED85 890D[64030300]      <1> 	mov	[u.r0], ecx ; actual transfer count	
  5458 0000ED8B E95CEBFFFF          <1> 	jmp	sysret
  5459                              <1> 
  5460                              <1> sysvideo_15_109:
  5461                              <1> 	; BL = 1 = user to system video/display page transfer
  5462 0000ED90 5F                  <1> 	pop	edi ; * ; LFB address
  5463 0000ED91 89CE                <1> 	mov	esi, ecx ; user's buffer
  5464                              <1> sysvideo_15_110:
  5465 0000ED93 89C1                <1> 	mov	ecx, eax ; LFB video page byte count
  5466 0000ED95 E874250000          <1> 	call	transfer_from_user_buffer ; fast transfer
  5467 0000ED9A EBE7                <1> 	jmp	short sysvideo_15_108
  5468                              <1> 
  5469                              <1> sysvideo_15_111:
  5470 0000ED9C 80FB03              <1> 	cmp	bl, 3
  5471 0000ED9F 7777                <1> 	ja	short sysvideo_15_117
  5472                              <1> 
  5473                              <1> 	; BL = 3 = NOT bits in window (ECX, EDX)
  5474 0000EDA1 5E                  <1> 	pop	esi ; * ; LFB address
  5475                              <1> 
  5476 0000EDA2 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  5477 0000EDA4 7315                <1> 	jnb	short sysvideo_15_113 ; window
  5478                              <1> 
  5479 0000EDA6 09D2                <1> 	or	edx, edx
  5480 0000EDA8 7569                <1> 	jnz	short sysvideo_15_116  ; invalid !
  5481                              <1> 
  5482                              <1> 	; full screen (update) ; edx = 0, ecx > 0
  5483 0000EDAA 89C1                <1> 	mov	ecx, eax ; LFB video page byte count
  5484 0000EDAC A3[64030300]        <1> 	mov	[u.r0], eax
  5485                              <1> sysvideo_15_112:
  5486 0000EDB1 F616                <1> 	not	byte [esi]
  5487 0000EDB3 46                  <1> 	inc	esi
  5488 0000EDB4 E2FB                <1> 	loop	sysvideo_15_112
  5489 0000EDB6 E931EBFFFF          <1> 	jmp	sysret
  5490                              <1> 
  5491                              <1> sysvideo_15_113:
  5492                              <1> 	; 29/12/2020
  5493                              <1> 	; fix dx to bp-1 if dx >= bp
  5494 0000EDBB E8690D0000          <1> 	call	sysvideo_15_200
  5495                              <1> 	;
  5496                              <1> 	; 29/12/2020
  5497 0000EDC0 89F7                <1> 	mov	edi, esi
  5498 0000EDC2 01C7                <1> 	add	edi, eax ; end 3 bytes of video page + 3
  5499 0000EDC4 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  5500 0000EDC7 6629C8              <1> 	sub	ax, cx  ; - top left column
  5501 0000EDCA 7247                <1>         jb      short sysvideo_15_116 ; invalid
  5502 0000EDCC 40                  <1> 	inc	eax ; same column no == 1 column	 
  5503 0000EDCD 50                  <1> 	push	eax ; pixel count per window row
  5504 0000EDCE 52                  <1> 	push	edx
  5505                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  5506                              <1> 	; 30/12/2020
  5507                              <1> 	; calculate start offset
  5508 0000EDCF E8600D0000          <1> 	call	sysvideo_15_202
  5509                              <1> 		; eax = pixel position 
  5510 0000EDD4 89C2                <1> 	mov	edx, eax
  5511 0000EDD6 D1E0                <1> 	shl	eax, 1	; * 2
  5512 0000EDD8 01D0                <1> 	add	eax, edx ; * 3
  5513                              <1> 		; eax = byte position
  5514 0000EDDA 01C6                <1> 	add	esi, eax ; start address 
  5515 0000EDDC 59                  <1> 	pop	ecx ; edx
  5516                              <1> 	; 30/12/2020
  5517                              <1> 	; calculate start offset
  5518 0000EDDD E8540D0000          <1> 	call	sysvideo_15_203
  5519                              <1> 		; eax = pixel position 
  5520 0000EDE2 89C2                <1> 	mov	edx, eax
  5521 0000EDE4 D1E0                <1> 	shl	eax, 1	; * 2
  5522 0000EDE6 01D0                <1> 	add	eax, edx ; * 3
  5523                              <1> 		; eax = byte position
  5524 0000EDE8 5A                  <1> 	pop	edx ; pixel count per window row
  5525                              <1> 	; eax = offset of the last 3 bytes to be converted 
  5526 0000EDE9 01F0                <1> 	add	eax, esi
  5527 0000EDEB 39C7                <1> 	cmp	edi, eax
  5528 0000EDED 7624                <1> 	jna	short sysvideo_15_116 ; out of video page
  5529 0000EDEF 89C7                <1> 	mov	edi, eax ; stop address
  5530 0000EDF1 29D3                <1> 	sub	ebx, edx ; screen width - window width
  5531 0000EDF3 89D8                <1> 	mov	eax, ebx
  5532 0000EDF5 01DB                <1> 	add	ebx, ebx ; * 2
  5533 0000EDF7 01C3                <1> 	add	ebx, eax ; * 3
  5534                              <1> 		; ebx = screen-window difference in bytes	
  5535 0000EDF9 89D0                <1> 	mov	eax, edx
  5536 0000EDFB 01D2                <1> 	add	edx, edx ; * 2
  5537 0000EDFD 01C2                <1> 	add	edx, eax ; * 3
  5538                              <1> 		; edx = row size in bytes 
  5539 0000EDFF 4E                  <1> 	dec	esi
  5540                              <1> sysvideo_15_114:
  5541 0000EE00 89D1                <1> 	mov	ecx, edx ; window width (byte count)
  5542                              <1> sysvideo_15_115:
  5543 0000EE02 46                  <1> 	inc	esi
  5544 0000EE03 F616                <1> 	not	byte [esi]
  5545 0000EE05 E2FB                <1> 	loop	sysvideo_15_115
  5546 0000EE07 0115[64030300]      <1> 	add	[u.r0], edx ; 1 pixel = 3 bytes
  5547 0000EE0D 01DE                <1> 	add	esi, ebx ; add difference for next row
  5548                              <1> 	;
  5549 0000EE0F 39FE                <1> 	cmp	esi, edi ; stop address (included in loop)
  5550 0000EE11 76ED                <1> 	jna	short sysvideo_15_114
  5551                              <1> sysvideo_15_116:
  5552 0000EE13 E9D4EAFFFF          <1> 	jmp	sysret	
  5553                              <1> 
  5554                              <1> sysvideo_15_117:
  5555 0000EE18 80FB04              <1> 	cmp	bl, 4
  5556 0000EE1B 0F878C000000        <1>         ja	sysvideo_15_121
  5557                              <1> 
  5558                              <1> 	; BL = 4 = window copy (system to system)
  5559                              <1> 
  5560                              <1> 	; eax = LFB video page byte count 
  5561                              <1> 	;	(3 * pixel count)
  5562                              <1> 
  5563 0000EE21 5B                  <1> 	pop	ebx ; * ; LFB address
  5564                              <1> 
  5565 0000EE22 39DE                <1> 	cmp	esi, ebx
  5566 0000EE24 72ED                <1> 	jb	short sysvideo_15_116
  5567                              <1> 
  5568 0000EE26 39DF                <1> 	cmp	edi, ebx
  5569 0000EE28 72E9                <1> 	jb	short sysvideo_15_116
  5570 0000EE2A 01C3                <1> 	add	ebx, eax ; **
  5571 0000EE2C 39DE                <1> 	cmp	esi, ebx
  5572 0000EE2E 73E3                <1> 	jnb	short sysvideo_15_116
  5573 0000EE30 39DF                <1> 	cmp	edi, ebx
  5574 0000EE32 73DF                <1> 	jnb	short sysvideo_15_116
  5575                              <1> 	
  5576 0000EE34 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  5577 0000EE36 7315                <1> 	jnb	short sysvideo_15_118 ; window
  5578                              <1> 
  5579 0000EE38 09D2                <1> 	or	edx, edx
  5580 0000EE3A 75D7                <1> 	jnz	short sysvideo_15_116 ; invalid !
  5581                              <1> 
  5582 0000EE3C A3[64030300]        <1> 	mov	[u.r0], eax
  5583 0000EE41 89C1                <1> 	mov	ecx, eax ; byte count
  5584 0000EE43 C1E902              <1> 	shr	ecx, 2
  5585                              <1> 	; full screen copy ; edx = 0, ecx > 0
  5586 0000EE46 F3A5                <1> 	rep	movsd
  5587 0000EE48 E99FEAFFFF          <1> 	jmp	sysret
  5588                              <1> sysvideo_15_118:
  5589                              <1> 	; 29/12/2020
  5590                              <1> 	; fix dx to bp-1 if dx >= bp
  5591 0000EE4D E8D70C0000          <1> 	call	sysvideo_15_200
  5592                              <1> 	;
  5593                              <1> 	; 29/12/2020
  5594 0000EE52 6639CA              <1> 	cmp	dx, cx
  5595 0000EE55 72BC                <1>         jb      short sysvideo_15_116 ; invalid	
  5596                              <1> 
  5597 0000EE57 53                  <1> 	push	ebx ; end 3 bytes of video page + 3
  5598 0000EE58 29C3                <1> 	sub	ebx, eax ; **
  5599 0000EE5A 53                  <1> 	push	ebx ; LFB start/base address
  5600                              <1> 
  5601 0000EE5B 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  5602 0000EE5E 6629C8              <1> 	sub	ax, cx  ; - top left column
  5603 0000EE61 40                  <1> 	inc	eax ; same column no == 1 column	 
  5604 0000EE62 50                  <1> 	push	eax ; pixel count per window row
  5605 0000EE63 52                  <1> 	push	edx
  5606                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  5607                              <1> 	; 30/12/2020
  5608                              <1> 	; calculate start offset
  5609 0000EE64 E8CB0C0000          <1> 	call	sysvideo_15_202
  5610                              <1> 		; eax = pixel position 
  5611 0000EE69 89C2                <1> 	mov	edx, eax
  5612 0000EE6B D1E0                <1> 	shl	eax, 1	; * 2
  5613 0000EE6D 01D0                <1> 	add	eax, edx ; * 3
  5614                              <1> 		; eax = byte position
  5615 0000EE6F 01C7                <1> 	add	edi, eax ; start address 
  5616 0000EE71 01C6                <1> 	add	esi, eax
  5617 0000EE73 59                  <1> 	pop	ecx ; edx
  5618                              <1> 	; 30/12/2020
  5619                              <1> 	; calculate start offset
  5620 0000EE74 E8BD0C0000          <1> 	call	sysvideo_15_203
  5621                              <1> 		; eax = pixel position 
  5622 0000EE79 89C2                <1> 	mov	edx, eax
  5623 0000EE7B D1E0                <1> 	shl	eax, 1	; * 2
  5624 0000EE7D 01D0                <1> 	add	eax, edx ; * 3
  5625                              <1> 		; eax = byte position
  5626 0000EE7F 5A                  <1> 	pop	edx ; pixel count per window row
  5627 0000EE80 59                  <1> 	pop	ecx ; LFB start/base address
  5628 0000EE81 01C8                <1> 	add	eax, ecx ; stop address
  5629 0000EE83 59                  <1> 	pop	ecx ; the last 3 bytes of LFB + 3
  5630 0000EE84 39C8                <1> 	cmp	eax, ecx
  5631 0000EE86 738B                <1> 	jnb	short sysvideo_15_116
  5632                              <1> 	
  5633                              <1> 	;push	edi ; start address
  5634                              <1> 	;push	eax ; stop address (included)
  5635 0000EE88 29D3                <1> 	sub	ebx, edx ; screen width - window width
  5636 0000EE8A 89D9                <1> 	mov	ecx, ebx
  5637 0000EE8C 01DB                <1> 	add	ebx, ebx ; * 2
  5638 0000EE8E 01CB                <1> 	add	ebx, ecx ; * 3
  5639                              <1> 		; ebx = screen-window difference in bytes	
  5640 0000EE90 89D1                <1> 	mov	ecx, edx
  5641 0000EE92 01D2                <1> 	add	edx, edx ; * 2
  5642 0000EE94 01CA                <1> 	add	edx, ecx ; * 3
  5643                              <1> 		; edx = row size in bytes 
  5644                              <1> sysvideo_15_119:
  5645 0000EE96 89D1                <1> 	mov	ecx, edx
  5646 0000EE98 F3A4                <1> 	rep	movsb
  5647 0000EE9A 0115[64030300]      <1> 	add	[u.r0], edx ; 1 pixel = 4 bytes
  5648                              <1> 	;or	ebx, ebx
  5649                              <1> 	;jz	short sysvideo_15_120
  5650 0000EEA0 01DF                <1> 	add	edi, ebx ; add difference (for next row) 
  5651 0000EEA2 01DE                <1> 	add	esi, ebx
  5652                              <1> ;sysvideo_15_120:
  5653                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  5654 0000EEA4 39C7                <1> 	cmp	edi, eax
  5655 0000EEA6 76EE                <1> 	jna	short sysvideo_15_119
  5656                              <1> sysvideo_15_120:
  5657                              <1> 	;pop	ebx ; stop address
  5658                              <1> 	;pop	edi ; start address
  5659 0000EEA8 E93FEAFFFF          <1> 	jmp	sysret
  5660                              <1> 
  5661                              <1> sysvideo_15_121:
  5662 0000EEAD 80FB05              <1> 	cmp	bl, 5
  5663 0000EEB0 776A                <1>         ja      short sysvideo_15_126
  5664                              <1> 
  5665                              <1> 	; BL = 5 = window copy (user to system)
  5666                              <1> 
  5667                              <1> 	; eax = LFB video page byte count 
  5668                              <1> 	;	(3 * pixel count)
  5669                              <1> 
  5670 0000EEB2 5F                  <1> 	pop	edi ; * ; LFB address
  5671                              <1> 
  5672                              <1> 	; esi = user buffer (in user's memory space)
  5673 0000EEB3 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  5674 0000EEB5 7309                <1>       	jnb	short sysvideo_15_122 ; window
  5675                              <1> 
  5676 0000EEB7 09D2                <1> 	or	edx, edx
  5677                              <1> 	;jnz	sysret  ; invalid !
  5678 0000EEB9 75ED                <1> 	jnz	short sysvideo_15_120
  5679                              <1> 
  5680                              <1> 	; full screen copy ; edx = 0, ecx > 0
  5681 0000EEBB E9D3FEFFFF          <1> 	jmp	sysvideo_15_110 ; full screen copy
  5682                              <1> 
  5683                              <1> sysvideo_15_122:
  5684                              <1> 	; 29/12/2020
  5685                              <1> 	; fix dx to bp-1 if dx >= bp
  5686 0000EEC0 E8640C0000          <1> 	call	sysvideo_15_200
  5687                              <1> 	;
  5688                              <1> 	; 29/12/2020
  5689 0000EEC5 6639CA              <1> 	cmp	dx, cx
  5690 0000EEC8 72DE                <1> 	jb	short sysvideo_15_120 ; invalid !
  5691                              <1> 
  5692                              <1> 	; 01/01/2021
  5693 0000EECA 01F8                <1> 	add	eax, edi
  5694 0000EECC 50                  <1> 	push	eax ; the last 3 bytes of LFB + 3 
  5695 0000EECD 57                  <1> 	push	edi ; LFB start/base address
  5696                              <1> 
  5697 0000EECE 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  5698 0000EED1 6629C8              <1> 	sub	ax, cx  ; - top left column
  5699 0000EED4 40                  <1> 	inc	eax ; same column no == 1 column	 
  5700 0000EED5 50                  <1> 	push	eax ; pixel count per window row
  5701                              <1> 
  5702 0000EED6 52                  <1> 	push	edx
  5703                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  5704                              <1> 	; 30/12/2020
  5705                              <1> 	; calculate start offset
  5706 0000EED7 E8580C0000          <1> 	call	sysvideo_15_202
  5707                              <1> 		; eax = pixel position 
  5708 0000EEDC 89C2                <1> 	mov	edx, eax
  5709 0000EEDE D1E0                <1> 	shl	eax, 1	; * 2
  5710 0000EEE0 01D0                <1> 	add	eax, edx ; * 3
  5711                              <1> 		; eax = byte position
  5712 0000EEE2 01C7                <1> 	add	edi, eax ; start address 
  5713 0000EEE4 59                  <1> 	pop	ecx ; edx
  5714                              <1> 	; 30/12/2020
  5715                              <1> 	; calculate end offset
  5716 0000EEE5 E84C0C0000          <1> 	call	sysvideo_15_203
  5717                              <1> 		; eax = pixel position 
  5718 0000EEEA 89C2                <1> 	mov	edx, eax
  5719 0000EEEC D1E0                <1> 	shl	eax, 1	; * 2
  5720 0000EEEE 01D0                <1> 	add	eax, edx ; * 3
  5721                              <1> 		; eax = byte position
  5722 0000EEF0 5A                  <1> 	pop	edx ; pixel count per window row
  5723 0000EEF1 59                  <1> 	pop	ecx ; LFB start/base address
  5724 0000EEF2 01C8                <1> 	add	eax, ecx ; stop address
  5725 0000EEF4 59                  <1> 	pop	ecx ; the last 3 bytes of LFB + 3
  5726 0000EEF5 39C8                <1> 	cmp	eax, ecx
  5727                              <1> 	;jnb	sysret
  5728 0000EEF7 73AF                <1> 	jnb	short sysvideo_15_120
  5729                              <1> 
  5730                              <1> 	; 29/12/2020
  5731 0000EEF9 89D9                <1> 	mov	ecx, ebx
  5732 0000EEFB 01DB                <1> 	add	ebx, ebx ; * 2
  5733 0000EEFD 01CB                <1> 	add	ebx, ecx ; * 3
  5734                              <1> 		; ebx = screen-window difference in bytes	
  5735 0000EEFF 89D1                <1> 	mov	ecx, edx
  5736 0000EF01 01D2                <1> 	add	edx, edx ; * 2
  5737 0000EF03 01CA                <1> 	add	edx, ecx ; * 3
  5738                              <1> 		; edx = row size in bytes 
  5739                              <1> 	;push	edi ; start address 
  5740 0000EF05 50                  <1> 	push	eax ; stop address (included)
  5741                              <1> sysvideo_15_123:
  5742 0000EF06 89D1                <1> 	mov	ecx, edx ; byte count
  5743                              <1> 	; user to system video/display page window transfer
  5744                              <1> 	; esi =	user buffer
  5745 0000EF08 E801240000          <1> 	call	transfer_from_user_buffer ; fast transfer
  5746 0000EF0D 7207                <1> 	jc	short sysvideo_15_124
  5747                              <1> 		; ecx = actual transfer count (= ecx input) 
  5748                              <1> 	;add	[u.r0], ecx
  5749                              <1> 	;add	edi, ebx ; next row in video memory window
  5750                              <1> 	;add	esi, ecx ; next window row in user's buffer
  5751                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  5752                              <1> 	; 30/12/2020
  5753 0000EF0F E82F0C0000          <1> 	call	sysvideo_15_204
  5754 0000EF14 76F0                <1> 	jna	short sysvideo_15_123
  5755                              <1> sysvideo_15_124:
  5756 0000EF16 5B                  <1> 	pop	ebx ; stop address
  5757                              <1> 	;pop	edi ; start address
  5758                              <1> sysvideo_15_125:
  5759 0000EF17 E9D0E9FFFF          <1> 	jmp	sysret
  5760                              <1> 
  5761                              <1> sysvideo_15_126:
  5762 0000EF1C 80FB06              <1> 	cmp	bl, 6
  5763 0000EF1F 776A                <1> 	ja	short sysvideo_15_129
  5764                              <1> 
  5765                              <1> 	; BL = 6 = window copy (system to user)
  5766                              <1> 
  5767                              <1> 	; eax = LFB video page byte count 
  5768                              <1> 	;	(3 * pixel count)
  5769                              <1> 
  5770 0000EF21 89F7                <1> 	mov	edi, esi ; user buffer
  5771                              <1> 
  5772 0000EF23 5E                  <1> 	pop	esi ; * ; LFB address
  5773                              <1> 
  5774                              <1> 	; edi = user buffer (in user's memory space)
  5775 0000EF24 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  5776 0000EF26 7309                <1>         jnb     short sysvideo_15_127
  5777                              <1> 	
  5778 0000EF28 21D2                <1> 	and	edx, edx
  5779                              <1> 	;jnz	sysret	; invalid !
  5780 0000EF2A 75EB                <1> 	jnz	short sysvideo_15_125
  5781                              <1> 
  5782                              <1> 	; full screen copy  ; edx = 0, ecx > 0
  5783 0000EF2C E94BFEFFFF          <1> 	jmp	sysvideo_15_107
  5784                              <1> 
  5785                              <1> sysvideo_15_127:
  5786                              <1> 	; 29/12/2020
  5787                              <1> 	; fix dx to bp-1 if dx >= bp
  5788 0000EF31 E8F30B0000          <1> 	call	sysvideo_15_200
  5789                              <1> 	;
  5790                              <1> 	; 29/12/2020
  5791 0000EF36 6639CA              <1> 	cmp	dx, cx
  5792 0000EF39 72DC                <1> 	jb	short sysvideo_15_125 ; invalid !	
  5793                              <1> 
  5794 0000EF3B 89F3                <1> 	mov	ebx, esi ; LFB address
  5795 0000EF3D 01D8                <1> 	add	eax, ebx
  5796 0000EF3F 50                  <1> 	push	eax ; the last 3 bytes of LFB + 3 
  5797 0000EF40 53                  <1> 	push	ebx ; LFB start/base address
  5798                              <1> 
  5799 0000EF41 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  5800 0000EF44 6629C8              <1> 	sub	ax, cx  ; - top left column
  5801 0000EF47 40                  <1> 	inc	eax ; same column no == 1 column	 
  5802 0000EF48 50                  <1> 	push	eax ; pixel count per window row
  5803                              <1> 
  5804 0000EF49 52                  <1> 	push	edx
  5805                              <1> 	;movzx	ebx, word [ebp+2] ; screen width
  5806                              <1> 	; 30/12/2020
  5807                              <1> 	; calculate start offset
  5808 0000EF4A E8E50B0000          <1> 	call	sysvideo_15_202
  5809                              <1> 		; eax = pixel position 
  5810 0000EF4F 89C2                <1> 	mov	edx, eax
  5811 0000EF51 D1E0                <1> 	shl	eax, 1	; * 2
  5812 0000EF53 01D0                <1> 	add	eax, edx ; * 3
  5813                              <1> 		; eax = byte position
  5814 0000EF55 01C6                <1> 	add	esi, eax ; start address 
  5815 0000EF57 59                  <1> 	pop	ecx ; edx
  5816                              <1> 	; 30/12/2020
  5817                              <1> 	; calculate end offset
  5818 0000EF58 E8D90B0000          <1> 	call	sysvideo_15_203
  5819                              <1> 		; eax = pixel position 
  5820 0000EF5D 89C2                <1> 	mov	edx, eax
  5821 0000EF5F D1E0                <1> 	shl	eax, 1	; * 2
  5822 0000EF61 01D0                <1> 	add	eax, edx ; * 3
  5823                              <1> 		; eax = byte position
  5824 0000EF63 5A                  <1> 	pop	edx ; pixel count per window row
  5825 0000EF64 59                  <1> 	pop	ecx ; LFB start/base address
  5826 0000EF65 01C8                <1> 	add	eax, ecx ; stop address
  5827 0000EF67 59                  <1> 	pop	ecx ; the last 3 bytes of LFB + 3
  5828 0000EF68 39C8                <1> 	cmp	eax, ecx
  5829                              <1> 	;jnb	sysret
  5830 0000EF6A 73AB                <1> 	jnb	short sysvideo_15_125
  5831                              <1> 	
  5832                              <1> 	; 29/12/2020
  5833                              <1> 	;push	esi ; start address 
  5834 0000EF6C 50                  <1> 	push	eax ; stop address (included)
  5835                              <1> 
  5836 0000EF6D 89D8                <1> 	mov	eax, ebx
  5837 0000EF6F 01DB                <1> 	add	ebx, ebx ; * 2
  5838 0000EF71 01C3                <1> 	add	ebx, eax ; * 3
  5839                              <1> 		; ebx = screen-window difference in bytes	
  5840 0000EF73 89D0                <1> 	mov	eax, edx
  5841 0000EF75 01D2                <1> 	add	edx, edx ; * 2
  5842 0000EF77 01C2                <1> 	add	edx, eax ; * 3
  5843                              <1> 		; edx = row size in bytes 
  5844                              <1> sysvideo_15_128:
  5845 0000EF79 89D1                <1> 	mov	ecx, edx ; byte count
  5846                              <1> 	; user to system video/display page window transfer
  5847                              <1> 	; esi =	user buffer
  5848 0000EF7B E844230000          <1> 	call	transfer_to_user_buffer ; fast transfer
  5849                              <1> 	;jc	short sysvideo_15_128_0
  5850 0000EF80 7294                <1> 	jc	short sysvideo_15_124
  5851                              <1> 	;add	[u.r0], ecx
  5852                              <1> 	;add	edi, ebx ; next row in video memory window
  5853                              <1> 	;add	esi, ecx ; next window row in user's buffer
  5854                              <1> 	;cmp	edi, [esp] ; stop addr (included in loop)
  5855                              <1> 	; 30/12/2020
  5856 0000EF82 E8BC0B0000          <1> 	call	sysvideo_15_204
  5857 0000EF87 76F0                <1> 	jna	short sysvideo_15_128
  5858 0000EF89 EB8B                <1> 	jmp	sysvideo_15_124
  5859                              <1> 
  5860                              <1> sysvideo_15_129:
  5861                              <1> 	; bl = 7, 8, 9, 10, 11, 12, 13
  5862                              <1> 	; (bl > 13 is invalid for current kernel version)
  5863                              <1> 
  5864                              <1> 	;cmp	bl, 13
  5865                              <1> 	;ja	short sysvideo_15_124
  5866                              <1> 
  5867                              <1> 	; 01/01/2021
  5868 0000EF8B 80FB0E              <1> 	cmp	bl, 14
  5869 0000EF8E 0F83F8030000        <1> 	jnb	sysvideo_15_177
  5870                              <1> 
  5871                              <1> 	; eax = LFB video page size (w*h*3) in bytes
  5872                              <1> 
  5873 0000EF94 5E                  <1> 	pop	esi ; * ; LFB base/start address
  5874                              <1> 
  5875 0000EF95 91                  <1> 	xchg	eax, ecx ; ecx = byte count
  5876                              <1> 			 ; eax = 3 bytes for and/or/xor 
  5877 0000EF96 890D[64030300]      <1> 	mov	[u.r0], ecx ; return with
  5878                              <1> 			   ; byte count of display page
  5879                              <1> 			   ; (eax > 0 -> OK)
  5880 0000EF9C 80FB0A              <1> 	cmp	bl, 10
  5881 0000EF9F 7249                <1> 	jb	short sysvideo_15_133 ; 7, 8, 9
  5882 0000EFA1 740C                <1> 	je	short sysvideo_15_130 ; 10
  5883 0000EFA3 80FB0C              <1> 	cmp	bl, 12
  5884 0000EFA6 7219                <1> 	jb	short sysvideo_15_131 ; 11
  5885 0000EFA8 7429                <1> 	je	short sysvideo_15_132 ; 12
  5886                              <1> 
  5887                              <1> 	; BL = 13 = NOT display page dwords
  5888                              <1> 
  5889 0000EFAA E902FEFFFF          <1> 	jmp	sysvideo_15_112
  5890                              <1> 
  5891                              <1> 	; BL = 10 = INC display page dwords
  5892                              <1> sysvideo_15_130:
  5893 0000EFAF FE06                <1> 	inc	byte [esi]
  5894 0000EFB1 7504                <1> 	jnz	short sysvideo_15_130_0
  5895 0000EFB3 66FF4602            <1> 	inc	word [esi+2] 
  5896                              <1> sysvideo_15_130_0:
  5897 0000EFB7 83C603              <1> 	add	esi, 3
  5898 0000EFBA 83E903              <1> 	sub	ecx, 3
  5899 0000EFBD 77F0                <1> 	ja	short sysvideo_15_130
  5900 0000EFBF EB6D                <1> 	jmp	short sysvideo_15_137
  5901                              <1> 
  5902                              <1> 	; BL = 11 = DEC display page dwords
  5903                              <1> sysvideo_15_131:
  5904 0000EFC1 FE0E                <1> 	dec	byte [esi]
  5905 0000EFC3 7504                <1> 	jnz	short sysvideo_15_131_0
  5906 0000EFC5 66FF4E02            <1> 	dec	word [esi+2] 
  5907                              <1> sysvideo_15_131_0:
  5908 0000EFC9 83C603              <1> 	add	esi, 3
  5909 0000EFCC 83E903              <1> 	sub	ecx, 3
  5910 0000EFCF 77F0                <1> 	ja	short sysvideo_15_131
  5911 0000EFD1 EB5B                <1> 	jmp	short sysvideo_15_137
  5912                              <1> 
  5913                              <1> 	; BL = 12 = NEG display page dwords
  5914                              <1> sysvideo_15_132:
  5915                              <1> 	; 01/01/2021
  5916                              <1> 	;mov	edx, 00FFFFFFh
  5917                              <1> ;sysvideo_15_132_0:
  5918 0000EFD3 8B06                <1> 	mov	eax, [esi]
  5919                              <1> 	;and	eax, edx
  5920 0000EFD5 F7D8                <1> 	neg	eax
  5921 0000EFD7 668906              <1>  	mov	[esi], ax
  5922 0000EFDA C1E810              <1> 	shr	eax, 16
  5923 0000EFDD 884602              <1> 	mov	[esi+2], al
  5924 0000EFE0 83C603              <1> 	add	esi, 3
  5925 0000EFE3 83E903              <1> 	sub	ecx, 3
  5926                              <1> 	;ja	short sysvideo_15_132_0
  5927 0000EFE6 77EB                <1> 	ja	short sysvideo_15_132
  5928 0000EFE8 EB44                <1> 	jmp	short sysvideo_15_137
  5929                              <1> 
  5930                              <1> sysvideo_15_133:
  5931                              <1> 	; bl = 7, 8, 9
  5932                              <1> 	; ecx = pixel count
  5933                              <1> 	; 28/12/2020
  5934 0000EFEA 80FB08              <1> 	cmp	bl, 8
  5935 0000EFED 7417                <1> 	je	short sysvideo_15_135
  5936 0000EFEF 772A                <1> 	ja	short sysvideo_15_136
  5937                              <1> 
  5938                              <1> 	; BL = 7 = AND display page dwords with ECX
  5939                              <1> sysvideo_15_134:
  5940                              <1> 	; 24 bit AND
  5941 0000EFF1 662106              <1> 	and	[esi], ax
  5942 0000EFF4 C1C810              <1> 	ror	eax, 16 		
  5943 0000EFF7 46                  <1> 	inc	esi
  5944 0000EFF8 46                  <1> 	inc	esi
  5945 0000EFF9 2006                <1> 	and	[esi], al
  5946 0000EFFB C1C010              <1> 	rol	eax, 16
  5947 0000EFFE 46                  <1> 	inc	esi
  5948 0000EFFF 83E903              <1> 	sub	ecx, 3
  5949 0000F002 77ED                <1> 	ja	short sysvideo_15_134
  5950                              <1> 	;jmp	sysret	
  5951 0000F004 EB28                <1> 	jmp	short sysvideo_15_137
  5952                              <1> 
  5953                              <1> 	; BL = 8 = OR display page dwords with ECX
  5954                              <1> sysvideo_15_135:
  5955                              <1> 	; 24 bit OR
  5956 0000F006 660906              <1> 	or	[esi], ax
  5957 0000F009 C1C810              <1> 	ror	eax, 16 		
  5958 0000F00C 46                  <1> 	inc	esi
  5959 0000F00D 46                  <1> 	inc	esi
  5960 0000F00E 0806                <1> 	or	[esi], al
  5961 0000F010 C1C010              <1> 	rol	eax, 16
  5962 0000F013 46                  <1> 	inc	esi
  5963 0000F014 83E903              <1> 	sub	ecx, 3
  5964 0000F017 77ED                <1> 	ja	short sysvideo_15_135
  5965                              <1> 	;jmp	sysret	
  5966 0000F019 EB13                <1> 	jmp	short sysvideo_15_137
  5967                              <1> 
  5968                              <1> 	; BL = 9 = XOR display page dwords with ECX
  5969                              <1> sysvideo_15_136:
  5970                              <1> 	; 24 bit XOR
  5971 0000F01B 663106              <1> 	xor	[esi], ax
  5972 0000F01E C1C810              <1> 	ror	eax, 16 		
  5973 0000F021 46                  <1> 	inc	esi
  5974 0000F022 46                  <1> 	inc	esi
  5975 0000F023 3006                <1> 	xor	[esi], al
  5976 0000F025 C1C010              <1> 	rol	eax, 16
  5977 0000F028 46                  <1> 	inc	esi
  5978 0000F029 83E903              <1> 	sub	ecx, 3
  5979 0000F02C 77ED                <1> 	ja	short sysvideo_15_136
  5980                              <1> sysvideo_15_137:
  5981 0000F02E E9B9E8FFFF          <1> 	jmp	sysret
  5982                              <1> 
  5983                              <1> sysvideo_15_138:
  5984                              <1> 	; 02/01/2020
  5985                              <1> 	; bh = 8 (function: bh = 2 or bh = 1)
  5986                              <1> 	; 01/01/2021
  5987 0000F033 80FB0E              <1> 	cmp	bl, 14
  5988                              <1> 	;ja	sysvideo_15_190 ; bl = 15
  5989 0000F036 0F85B9040000        <1> 	jne	sysvideo_15_190 ; bl = 15
  5990                              <1> 
  5991                              <1> 	; BL = 14 = masked write of pixels
  5992                              <1> 	;	    (8 bpp)	
  5993                              <1> 
  5994                              <1> 	; eax = LFB video page byte count 
  5995                              <1> 	;	(pixel count)
  5996                              <1> 
  5997                              <1> 	; esi = user's mask buffer address 
  5998                              <1> 	; edi = mask color
  5999                              <1> 
  6000                              <1> 	; ECX Low 16 bits = Top left column (X1 position)
  6001                              <1> 	; ECX High 16 bits = Top row (Y1 position)
  6002                              <1> 	; EDX Low 16 bits = Bottom right column (X2 position)
  6003                              <1> 	; EDX High 16 bits = Bottom row (Y2 position)
  6004                              <1> 
  6005                              <1> 	; EBX bit 16 to 18 -> mask operation/option
  6006                              <1> 	;	0 = new color (in edi)
  6007                              <1> 	;	1 = add color (in edi) -up to 0FFh-
  6008                              <1> 	;	2 = average color (in edi) -(current+edi)/2-
  6009                              <1> 	;	3 = sub color (in edi) -down to 0-
  6010                              <1> 	;	4 = inc	color -up to 0FFh-
  6011                              <1> 	;	5 = dec	color -down to 0-
  6012                              <1> 	;	6 = not color
  6013                              <1> 	;	7 = neg color 
  6014                              <1> 
  6015 0000F03C 893D[7E120300]      <1> 	mov	[maskcolor], edi
  6016                              <1> 
  6017 0000F042 C1EB10              <1> 	shr	ebx, 16
  6018 0000F045 6683E307            <1> 	and	bx, 7 ; mask option
  6019 0000F049 C0E302              <1> 	shl	bl, 2 ; * 4
  6020 0000F04C 8B9B[F5F00000]      <1> 	mov	ebx, [ebx+mask_op_sub_tbl_8]
  6021                              <1> 		
  6022                              <1> 	; ebp = screen width
  6023                              <1> 	; ebx = function address
  6024                              <1> 	
  6025 0000F052 5F                  <1> 	pop	edi ; * ; LFB address
  6026                              <1> 
  6027                              <1> 	; esi = user buffer (in user's memory space)
  6028                              <1> 	;      (contains mask bits, 8 * window size)
  6029                              <1> 
  6030 0000F053 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  6031 0000F055 730F                <1>       	jnb	short sysvideo_15_139 ; window
  6032                              <1> 
  6033 0000F057 09D2                <1> 	or	edx, edx
  6034                              <1> 	;jnz	sysret  ; invalid !
  6035 0000F059 7554                <1> 	jnz	short sysvideo_15_142
  6036                              <1> 
  6037                              <1> 	; full screen masked write ; edx = 0, ecx > 0
  6038                              <1> 	; eax = LFB video page size
  6039 0000F05B 89C2                <1> 	mov	edx, eax
  6040 0000F05D 4A                  <1> 	dec	edx ; last byte of LFB video page
  6041 0000F05E 01FA                <1> 	add	edx, edi
  6042                              <1> 	; edx = stop address 
  6043 0000F060 89E9                <1> 	mov	ecx, ebp ; screen width
  6044 0000F062 87DD                <1> 	xchg	ebx, ebp
  6045                              <1> 	; ebx = screen width
  6046                              <1> 	; ebp = function address
  6047 0000F064 EB33                <1> 	jmp	short sysvideo_15_140
  6048                              <1> 
  6049                              <1> sysvideo_15_139:
  6050                              <1> 	; masked window write
  6051                              <1> 	;cmp	dx, bp ; end column < screen width ?
  6052                              <1> 	;jb	short sysvideo_15_139_0
  6053                              <1> 	; fix bottom right position of the window 
  6054                              <1> 	;mov	dx, bp
  6055                              <1> 	;dec	dx
  6056 0000F066 E8BE0A0000          <1> 	call	sysvideo_15_200
  6057                              <1> ;sysvideo_15_139_0:
  6058 0000F06B 6639CA              <1> 	cmp	dx, cx
  6059 0000F06E 723F                <1> 	jb	short sysvideo_15_142
  6060                              <1> 
  6061 0000F070 53                  <1> 	push	ebx ; (call) sub-function address
  6062                              <1> 
  6063 0000F071 01F8                <1> 	add	eax, edi
  6064                              <1> 
  6065 0000F073 50                  <1> 	push	eax ; the last byte of LFB + 1 
  6066 0000F074 57                  <1> 	push	edi ; LFB start/base address
  6067                              <1> 
  6068 0000F075 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  6069 0000F078 6629C8              <1> 	sub	ax, cx  ; - top left column
  6070 0000F07B 40                  <1> 	inc	eax ; same column no == 1 column
  6071                              <1> 	 
  6072 0000F07C 50                  <1> 	push	eax ; pixel count per window row
  6073                              <1> 
  6074 0000F07D 52                  <1> 	push	edx
  6075                              <1> 	;;movzx	ebx, word [ebp+2] ; screen width
  6076                              <1> 	;mov	ebx, ebp ; screen width
  6077                              <1> 	;mov	eax, ecx
  6078                              <1> 	;shr	eax, 16	; top row
  6079                              <1> 	;mul	ebx
  6080                              <1> 	;mov	dx, cx ; top left column
  6081                              <1> 	;add	eax, edx
  6082 0000F07E E8B10A0000          <1> 	call	sysvideo_15_202
  6083 0000F083 01C7                <1> 	add	edi, eax ; start address 
  6084 0000F085 59                  <1> 	pop	ecx ; edx
  6085                              <1> 	
  6086                              <1> 	;mov	eax, ecx
  6087                              <1> 	;shr	eax, 16 ; bottom row
  6088                              <1> 	;mul	ebx
  6089                              <1> 	;mov	dx, cx ; bottom right column
  6090                              <1> 	;add	eax, edx
  6091                              <1> 	; 30/12/2020
  6092                              <1> 	; calculate end offset
  6093 0000F086 E8AB0A0000          <1> 	call	sysvideo_15_203
  6094                              <1> 	
  6095 0000F08B 5A                  <1> 	pop	edx ; pixel count per window row
  6096 0000F08C 59                  <1> 	pop	ecx ; LFB start/base address
  6097                              <1> 
  6098 0000F08D 01C8                <1> 	add	eax, ecx ; stop address
  6099 0000F08F 59                  <1> 	pop	ecx ; the last byte of LFB + 1
  6100                              <1> 
  6101 0000F090 5D                  <1> 	pop	ebp ; (call) sub-function address
  6102                              <1> 
  6103 0000F091 39C8                <1> 	cmp	eax, ecx
  6104 0000F093 7357                <1> 	jnb	short sysvideo_15_150 ; wrong pos !
  6105                              <1> 
  6106                              <1> 	;push	edi ; start address 
  6107                              <1> 
  6108 0000F095 89D1                <1> 	mov	ecx, edx ; byte count
  6109 0000F097 89C2                <1> 	mov	edx, eax ; stop address 
  6110                              <1> 			 ; (the last byte included)
  6111                              <1> sysvideo_15_140:
  6112                              <1> 	; ebp = (masked) color change function address
  6113                              <1> 	; esi = user's buffer address (virtual)
  6114                              <1> 	; edi = window start address in LFB
  6115                              <1> 	; ebx = screen width
  6116                              <1> 	; edx = stop address
  6117                              <1> 	; ecx = window width in bytes
  6118 0000F099 83C107              <1> 	add	ecx, 7
  6119 0000F09C C1E903              <1> 	shr	ecx, 3 ; mask byte count (for user's buffer)
  6120                              <1> sysvideo_15_141:
  6121                              <1> 	; edx = stop address (the last byte included!)
  6122 0000F09F 51                  <1> 	push	ecx ; **
  6123 0000F0A0 57                  <1> 	push	edi ; * ; start address in LFB
  6124                              <1> 	; ecx = byte count (per row)
  6125 0000F0A1 BF00600900          <1> 	mov	edi, VBE3STACKADDR ; destination
  6126                              <1> 	; user to system video/display page window transfer
  6127                              <1> 	; esi =	user buffer
  6128                              <1> 	; edi = system buffer
  6129 0000F0A6 E863220000          <1> 	call	transfer_from_user_buffer ; fast transfer
  6130                              <1> 		; eax & ecx modified, other regs preserved
  6131 0000F0AB 5F                  <1> 	pop	edi ; * ; start address in LFB
  6132 0000F0AC 7306                <1> 	jnc	short sysvideo_15_143	
  6133                              <1> 	; memory error !
  6134 0000F0AE 59                  <1> 	pop	ecx ; **
  6135                              <1> sysvideo_15_142:
  6136 0000F0AF E938E8FFFF          <1> 	jmp	sysret
  6137                              <1> sysvideo_15_143:
  6138 0000F0B4 56                  <1> 	push	esi ; *** ; user's buffer address
  6139 0000F0B5 BE00600900          <1> 	mov	esi, VBE3STACKADDR ; source (in sys mem)
  6140                              <1> sysvideo_15_144:
  6141 0000F0BA 53                  <1> 	push	ebx ; **** ; screen width
  6142 0000F0BB 57                  <1> 	push	edi ; ***** ; window start address in LFB 
  6143 0000F0BC 8A1D[7E120300]      <1> 	mov	bl, [maskcolor]
  6144                              <1> sysvideo_15_145:
  6145 0000F0C2 B408                <1> 	mov	ah, 8 ; 8 mask bits for 8 pixels (8 bytes)
  6146 0000F0C4 AC                  <1> 	lodsb
  6147                              <1> sysvideo_15_146:
  6148 0000F0C5 D0E8                <1> 	shr	al, 1
  6149 0000F0C7 7402                <1> 	jz	short sysvideo_15_147
  6150                              <1> 	;mov	[edi], bl  ; color
  6151 0000F0C9 FFD5                <1> 	call	ebp ; sub function (color change function)
  6152                              <1> sysvideo_15_147:
  6153 0000F0CB FF05[64030300]      <1> 	inc	dword [u.r0]
  6154 0000F0D1 47                  <1> 	inc	edi
  6155 0000F0D2 39D7                <1> 	cmp	edi, edx ; stop address ?		
  6156 0000F0D4 7716                <1> 	ja	short sysvideo_15_150
  6157 0000F0D6 FECC                <1> 	dec	ah
  6158 0000F0D8 7405                <1> 	jz	short sysvideo_15_148
  6159 0000F0DA 49                  <1> 	dec	ecx
  6160 0000F0DB 75E8                <1> 	jnz	short sysvideo_15_146	
  6161 0000F0DD EB03                <1>  	jmp	short sysvideo_15_149
  6162                              <1> sysvideo_15_148:
  6163 0000F0DF 49                  <1> 	dec	ecx
  6164 0000F0E0 75E0                <1> 	jnz	short sysvideo_15_145
  6165                              <1> sysvideo_15_149:
  6166 0000F0E2 5F                  <1> 	pop	edi ; ***** ; cur row in video memory window
  6167 0000F0E3 5B                  <1> 	pop	ebx ; **** ; screen width
  6168 0000F0E4 5E                  <1> 	pop	esi ; ***  ; user's buffer address
  6169 0000F0E5 59                  <1> 	pop	ecx ; ** ; mask byte count (per window width)
  6170 0000F0E6 01DF                <1> 	add	edi, ebx ; next row in video memory window
  6171 0000F0E8 01CE                <1> 	add	esi, ecx ; next window row in user's buffer
  6172 0000F0EA EBB3                <1> 	jmp	short sysvideo_15_141
  6173                              <1> sysvideo_15_150:
  6174 0000F0EC 5F                  <1> 	pop	edi ; ***** ; cur row in video memory window
  6175 0000F0ED 5B                  <1> 	pop	ebx ; **** ; window width
  6176 0000F0EE 5E                  <1> 	pop	esi ; *** ; user's buffer address
  6177 0000F0EF 59                  <1> 	pop	ecx ; ** ; mask byte count
  6178 0000F0F0 E9F7E7FFFF          <1> 	jmp	sysret
  6179                              <1> 
  6180                              <1> mask_op_sub_tbl_8:
  6181 0000F0F5 [15F10000]          <1> 	dd	mask_op_new_8
  6182 0000F0F9 [18F10000]          <1> 	dd	mask_op_add_8
  6183 0000F0FD [28F10000]          <1> 	dd	mask_op_avg_8
  6184 0000F101 [20F10000]          <1> 	dd	mask_op_sub_8
  6185 0000F105 [2DF10000]          <1> 	dd	mask_op_inc_8
  6186 0000F109 [34F10000]          <1> 	dd	mask_op_dec_8
  6187 0000F10D [3BF10000]          <1> 	dd	mask_op_not_8
  6188 0000F111 [3EF10000]          <1> 	dd	mask_op_neg_8	
  6189                              <1> 
  6190                              <1> mask_op_new_8:
  6191 0000F115 881F                <1> 	mov	[edi], bl
  6192 0000F117 C3                  <1> 	retn
  6193                              <1> 
  6194                              <1> mask_op_add_8:
  6195 0000F118 001F                <1> 	add	[edi], bl
  6196 0000F11A 7303                <1> 	jnc	short mask_op_add_8_retn
  6197 0000F11C C607FF              <1> 	mov	byte [edi], 0FFh
  6198                              <1> mask_op_add_8_retn:
  6199 0000F11F C3                  <1> 	retn
  6200                              <1> 
  6201                              <1> mask_op_sub_8:
  6202 0000F120 281F                <1> 	sub	[edi], bl
  6203 0000F122 7303                <1> 	jnb	short mask_op_sub_8_retn
  6204 0000F124 C60700              <1> 	mov	byte [edi], 0
  6205                              <1> mask_op_sub_8_retn:
  6206 0000F127 C3                  <1> 	retn
  6207                              <1> 
  6208                              <1> mask_op_avg_8:
  6209 0000F128 001F                <1> 	add	[edi], bl
  6210 0000F12A D01F                <1> 	rcr	byte [edi], 1
  6211 0000F12C C3                  <1> 	retn
  6212                              <1> 
  6213                              <1> mask_op_inc_8:
  6214 0000F12D FE07                <1> 	inc	byte [edi]
  6215 0000F12F 7902                <1> 	jns	short mask_op_inc_8_retn
  6216 0000F131 FE0F                <1> 	dec	byte [edi] ; 0FFh
  6217                              <1> mask_op_inc_8_retn:
  6218 0000F133 C3                  <1> 	retn
  6219                              <1> 
  6220                              <1> mask_op_dec_8:
  6221 0000F134 FE0F                <1> 	dec	byte [edi]
  6222 0000F136 75E7                <1> 	jnz	short mask_op_add_8_retn
  6223 0000F138 FE07                <1> 	inc	byte [edi] ; 0
  6224                              <1> mask_op_dec_8_retn:
  6225 0000F13A C3                  <1> 	retn
  6226                              <1> 
  6227                              <1> mask_op_not_8:
  6228 0000F13B F617                <1> 	not	byte [edi]
  6229 0000F13D C3                  <1> 	retn
  6230                              <1> 
  6231                              <1> mask_op_neg_8:
  6232 0000F13E F61F                <1> 	neg	byte [edi]
  6233 0000F140 C3                  <1> 	retn
  6234                              <1> 
  6235                              <1> sysvideo_15_151:
  6236                              <1> 	; 02/01/2020
  6237                              <1> 	; bh = 16 (function: bh = 2)
  6238                              <1> 	; 01/01/2021
  6239 0000F141 80FB0E              <1> 	cmp	bl, 14
  6240                              <1> 	;ja	sysvideo_15_190 ; bl = 15
  6241 0000F144 0F85AB030000        <1> 	jne	sysvideo_15_190 ; bl = 15
  6242                              <1> 
  6243                              <1> 	; BL = 14 = masked write of pixels
  6244                              <1> 	;	(16 bpp)
  6245                              <1> 
  6246                              <1> 	; eax = LFB video page byte count 
  6247                              <1> 	;	(2 * pixel count)
  6248                              <1> 
  6249                              <1> 	; esi = user's mask buffer address 
  6250                              <1> 	; edi = mask color
  6251                              <1> 
  6252                              <1> 	; ECX Low 16 bits = Top left column (X1 position)
  6253                              <1> 	; ECX High 16 bits = Top row (Y1 position)
  6254                              <1> 	; EDX Low 16 bits = Bottom right column (X2 position)
  6255                              <1> 	; EDX High 16 bits = Bottom row (Y2 position)
  6256                              <1> 
  6257                              <1> 	; EBX bit 16 to 18 -> mask operation/option
  6258                              <1> 	;	0 = new color (in edi)
  6259                              <1> 	;	1 = add color (in edi) -up to 0FFFFh-
  6260                              <1> 	;	2 = average color (in edi) -(current+edi)/2-
  6261                              <1> 	;	3 = sub color (in edi) -down to 0-
  6262                              <1> 	;	4 = inc	color -up to 0FFFFh-
  6263                              <1> 	;	5 = dec	color -down to 0-
  6264                              <1> 	;	6 = not color
  6265                              <1> 	;	7 = neg color 
  6266                              <1> 
  6267 0000F14A 893D[7E120300]      <1> 	mov	[maskcolor], edi
  6268                              <1> 
  6269 0000F150 C1EB10              <1> 	shr	ebx, 16
  6270 0000F153 6683E307            <1> 	and	bx, 7 ; mask option
  6271 0000F157 C0E302              <1> 	shl	bl, 2 ; * 4
  6272 0000F15A 8B9B[0EF20000]      <1> 	mov	ebx, [ebx+mask_op_sub_tbl_16]
  6273                              <1> 		
  6274                              <1> 	; ebp = screen width
  6275                              <1> 	; ebx = function address
  6276                              <1> 	
  6277 0000F160 5F                  <1> 	pop	edi ; * ; LFB address
  6278                              <1> 
  6279                              <1> 	; esi = user buffer (in user's memory space)
  6280                              <1> 	;      (contains mask bits, 8 * window size)
  6281                              <1> 
  6282 0000F161 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  6283 0000F163 7310                <1>       	jnb	short sysvideo_15_152 ; window
  6284                              <1> 
  6285 0000F165 09D2                <1> 	or	edx, edx
  6286                              <1> 	;jnz	sysret  ; invalid !
  6287 0000F167 755C                <1> 	jnz	short sysvideo_15_155
  6288                              <1> 
  6289                              <1> 	; full screen masked write ; edx = 0, ecx > 0
  6290                              <1> 	; eax = LFB video page size
  6291 0000F169 89C2                <1> 	mov	edx, eax
  6292 0000F16B 4A                  <1> 	dec	edx
  6293 0000F16C 4A                  <1> 	dec	edx ; last word of LFB video page
  6294 0000F16D 01FA                <1> 	add	edx, edi
  6295                              <1> 	; edx = stop address 
  6296 0000F16F 89E9                <1> 	mov	ecx, ebp ; screen width
  6297 0000F171 87DD                <1> 	xchg	ebx, ebp
  6298                              <1> 	; ebx = screen width
  6299                              <1> 	; ebp = function address
  6300 0000F173 EB37                <1> 	jmp	short sysvideo_15_153
  6301                              <1> 
  6302                              <1> sysvideo_15_152:
  6303                              <1> 	; masked window write
  6304                              <1> 	;cmp	dx, bp ; end column < screen width ?
  6305                              <1> 	;jb	short sysvideo_15_152_0
  6306                              <1> 	; fix bottom right position of the window 
  6307                              <1> 	;mov	dx, bp
  6308                              <1> 	;dec	dx
  6309 0000F175 E8AF090000          <1> 	call	sysvideo_15_200
  6310                              <1> ;sysvideo_15_152_0:
  6311 0000F17A 6639CA              <1> 	cmp	dx, cx
  6312 0000F17D 7246                <1> 	jb	short sysvideo_15_155
  6313                              <1> 
  6314 0000F17F 53                  <1> 	push	ebx ; (call) sub-function address
  6315                              <1> 
  6316 0000F180 01F8                <1> 	add	eax, edi
  6317                              <1> 
  6318 0000F182 50                  <1> 	push	eax ; the last word of LFB + 2 
  6319 0000F183 57                  <1> 	push	edi ; LFB start/base address
  6320                              <1> 
  6321 0000F184 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  6322 0000F187 6629C8              <1> 	sub	ax, cx  ; - top left column
  6323 0000F18A 40                  <1> 	inc	eax ; same column no == 1 column
  6324                              <1> 	 
  6325 0000F18B 50                  <1> 	push	eax ; pixel count per window row
  6326                              <1> 
  6327 0000F18C 52                  <1> 	push	edx
  6328                              <1> 	;;movzx	ebx, word [ebp+2] ; screen width
  6329                              <1> 	;mov	ebx, ebp ; screen width
  6330                              <1> 	;mov	eax, ecx
  6331                              <1> 	;shr	eax, 16	; top row
  6332                              <1> 	;mul	ebx
  6333                              <1> 	;mov	dx, cx ; top left column
  6334                              <1> 	;add	eax, edx
  6335 0000F18D E8A2090000          <1> 	call	sysvideo_15_202
  6336 0000F192 D1E0                <1> 	shl	eax, 1 ; from pixel to byte
  6337 0000F194 01C7                <1> 	add	edi, eax ; start address 
  6338 0000F196 59                  <1> 	pop	ecx ; edx
  6339                              <1> 	
  6340                              <1> 	;mov	eax, ecx
  6341                              <1> 	;shr	eax, 16 ; bottom row
  6342                              <1> 	;mul	ebx
  6343                              <1> 	;mov	dx, cx ; bottom right column
  6344                              <1> 	;add	eax, edx
  6345                              <1> 	; 30/12/2020
  6346                              <1> 	; calculate end offset
  6347 0000F197 E89A090000          <1> 	call	sysvideo_15_203
  6348 0000F19C D1E0                <1> 	shl	eax, 1 ; from pixel to byte
  6349                              <1> 	
  6350 0000F19E 5A                  <1> 	pop	edx ; pixel count per window row
  6351 0000F19F 59                  <1> 	pop	ecx ; LFB start/base address
  6352                              <1> 
  6353 0000F1A0 01C8                <1> 	add	eax, ecx ; stop address
  6354 0000F1A2 59                  <1> 	pop	ecx ; the last word of LFB + 2
  6355                              <1> 
  6356 0000F1A3 5D                  <1> 	pop	ebp ; (call) sub-function address
  6357                              <1> 
  6358 0000F1A4 39C8                <1> 	cmp	eax, ecx
  6359 0000F1A6 735D                <1> 	jnb	short sysvideo_15_163 ; wrong pos !
  6360                              <1> 
  6361                              <1> 	;push	edi ; start address 
  6362                              <1> 
  6363 0000F1A8 89D1                <1> 	mov	ecx, edx ; pixel count
  6364 0000F1AA 89C2                <1> 	mov	edx, eax ; stop address 
  6365                              <1> 			 ; (the last word included)
  6366                              <1> sysvideo_15_153:
  6367                              <1> 	; ebp = (masked) color change function address
  6368                              <1> 	; esi = user's buffer address (virtual)
  6369                              <1> 	; edi = window start address in LFB
  6370                              <1> 	; ebx = screen width
  6371                              <1> 	; edx = stop address
  6372                              <1> 	; ecx = window width in pixels
  6373 0000F1AC 66D1E3              <1> 	shl	bx, 1 ; convert pixel count to byte count
  6374 0000F1AF 83C107              <1> 	add	ecx, 7
  6375 0000F1B2 C1E903              <1> 	shr	ecx, 3 ; mask byte count (for user's buffer)
  6376                              <1> sysvideo_15_154:
  6377                              <1> 	; edx = stop address (the last word included!)
  6378 0000F1B5 51                  <1> 	push	ecx ; **
  6379 0000F1B6 57                  <1> 	push	edi ; * ; start address in LFB
  6380                              <1> 	; ecx = byte count (per row)
  6381 0000F1B7 BF00600900          <1> 	mov	edi, VBE3STACKADDR ; destination
  6382                              <1> 	; user to system video/display page window transfer
  6383                              <1> 	; esi =	user buffer
  6384                              <1> 	; edi = system buffer
  6385 0000F1BC E84D210000          <1> 	call	transfer_from_user_buffer ; fast transfer
  6386                              <1> 		; eax & ecx modified, other regs preserved
  6387 0000F1C1 5F                  <1> 	pop	edi ; * ; start address in LFB
  6388 0000F1C2 7306                <1> 	jnc	short sysvideo_15_156	
  6389                              <1> 	; memory error !
  6390 0000F1C4 59                  <1> 	pop	ecx ; **
  6391                              <1> sysvideo_15_155:
  6392 0000F1C5 E922E7FFFF          <1> 	jmp	sysret
  6393                              <1> sysvideo_15_156:
  6394 0000F1CA 56                  <1> 	push	esi ; *** ; user's buffer address
  6395 0000F1CB BE00600900          <1> 	mov	esi, VBE3STACKADDR ; source (in sys mem)
  6396                              <1> sysvideo_15_157:
  6397 0000F1D0 53                  <1> 	push	ebx ; **** ; screen width
  6398 0000F1D1 57                  <1> 	push	edi ; ***** ; window start address in LFB 
  6399 0000F1D2 668B1D[7E120300]    <1> 	mov	bx, [maskcolor]
  6400                              <1> sysvideo_15_158:
  6401 0000F1D9 B408                <1> 	mov	ah, 8 ; 8 mask bits for 8 pixels (16 bytes)
  6402 0000F1DB AC                  <1> 	lodsb
  6403                              <1> sysvideo_15_159:
  6404 0000F1DC D0E8                <1> 	shr	al, 1
  6405 0000F1DE 7402                <1> 	jz	short sysvideo_15_160
  6406                              <1> 	;mov	[edi], bx  ; color
  6407 0000F1E0 FFD5                <1> 	call	ebp ; sub function (color change function)
  6408                              <1> sysvideo_15_160:
  6409 0000F1E2 8305[64030300]02    <1> 	add	dword [u.r0], 2
  6410 0000F1E9 47                  <1> 	inc	edi
  6411 0000F1EA 47                  <1> 	inc	edi
  6412 0000F1EB 39D7                <1> 	cmp	edi, edx ; stop address ?		
  6413 0000F1ED 7716                <1> 	ja	short sysvideo_15_163
  6414 0000F1EF FECC                <1> 	dec	ah
  6415 0000F1F1 7405                <1> 	jz	short sysvideo_15_161
  6416 0000F1F3 49                  <1> 	dec	ecx
  6417 0000F1F4 75E6                <1> 	jnz	short sysvideo_15_159	
  6418 0000F1F6 EB03                <1>  	jmp	short sysvideo_15_162
  6419                              <1> sysvideo_15_161:
  6420 0000F1F8 49                  <1> 	dec	ecx
  6421 0000F1F9 75DE                <1> 	jnz	short sysvideo_15_158
  6422                              <1> sysvideo_15_162:
  6423 0000F1FB 5F                  <1> 	pop	edi ; ***** ; cur row in video memory window
  6424 0000F1FC 5B                  <1> 	pop	ebx ; **** ; screen width
  6425 0000F1FD 5E                  <1> 	pop	esi ; ***  ; user's buffer address
  6426 0000F1FE 59                  <1> 	pop	ecx ; ** ; mask byte count (per window width)
  6427 0000F1FF 01DF                <1> 	add	edi, ebx ; next row in video memory window
  6428 0000F201 01CE                <1> 	add	esi, ecx ; next window row in user's buffer
  6429 0000F203 EBB0                <1> 	jmp	short sysvideo_15_154
  6430                              <1> sysvideo_15_163:
  6431 0000F205 5F                  <1> 	pop	edi ; ***** ; cur row in video memory window
  6432 0000F206 5B                  <1> 	pop	ebx ; **** ; window width
  6433 0000F207 5E                  <1> 	pop	esi ; *** ; user's buffer address
  6434 0000F208 59                  <1> 	pop	ecx ; ** ; mask byte count
  6435 0000F209 E9DEE6FFFF          <1> 	jmp	sysret
  6436                              <1> 
  6437                              <1> mask_op_sub_tbl_16:
  6438 0000F20E [2EF20000]          <1> 	dd	mask_op_new_16
  6439 0000F212 [32F20000]          <1> 	dd	mask_op_add_16
  6440 0000F216 [48F20000]          <1> 	dd	mask_op_avg_16
  6441 0000F21A [3DF20000]          <1> 	dd	mask_op_sub_16
  6442 0000F21E [4FF20000]          <1> 	dd	mask_op_inc_16
  6443 0000F222 [58F20000]          <1> 	dd	mask_op_dec_16
  6444 0000F226 [61F20000]          <1> 	dd	mask_op_not_16
  6445 0000F22A [65F20000]          <1> 	dd	mask_op_neg_16	
  6446                              <1> 
  6447                              <1> mask_op_new_16:
  6448 0000F22E 66891F              <1> 	mov	[edi], bx
  6449 0000F231 C3                  <1> 	retn
  6450                              <1> 
  6451                              <1> mask_op_add_16:
  6452 0000F232 66011F              <1> 	add	[edi], bx
  6453 0000F235 7305                <1> 	jnc	short mask_op_add_16_retn
  6454 0000F237 66C707FFFF          <1> 	mov	word [edi], 0FFFFh
  6455                              <1> mask_op_add_16_retn:
  6456 0000F23C C3                  <1> 	retn
  6457                              <1> 
  6458                              <1> mask_op_sub_16:
  6459 0000F23D 66291F              <1> 	sub	[edi], bx
  6460 0000F240 7305                <1> 	jnb	short mask_op_sub_16_retn
  6461 0000F242 66C7070000          <1> 	mov	word [edi], 0
  6462                              <1> mask_op_sub_16_retn:
  6463 0000F247 C3                  <1> 	retn
  6464                              <1> 
  6465                              <1> mask_op_avg_16:
  6466 0000F248 66011F              <1> 	add	[edi], bx
  6467 0000F24B 66D11F              <1> 	rcr	word [edi], 1
  6468 0000F24E C3                  <1> 	retn
  6469                              <1> 
  6470                              <1> mask_op_inc_16:
  6471 0000F24F 66FF07              <1> 	inc	word [edi]
  6472 0000F252 7503                <1> 	jnz	short mask_op_inc_16_retn
  6473 0000F254 66FF0F              <1> 	dec	word [edi] ; 0FFFFh
  6474                              <1> mask_op_inc_16_retn:
  6475 0000F257 C3                  <1> 	retn
  6476                              <1> 
  6477                              <1> mask_op_dec_16:
  6478 0000F258 66FF0F              <1> 	dec	word [edi]
  6479 0000F25B 79DF                <1> 	jns	short mask_op_add_16_retn
  6480 0000F25D 66FF07              <1> 	inc	word [edi] ; 0
  6481                              <1> mask_op_dec_16_retn:
  6482 0000F260 C3                  <1> 	retn
  6483                              <1> 
  6484                              <1> mask_op_not_16:
  6485 0000F261 66F717              <1> 	not	word [edi]
  6486 0000F264 C3                  <1> 	retn
  6487                              <1> 
  6488                              <1> mask_op_neg_16:
  6489 0000F265 66F71F              <1> 	neg	word [edi]
  6490 0000F268 C3                  <1> 	retn
  6491                              <1> 
  6492                              <1> sysvideo_15_164:
  6493                              <1> 	; 02/01/2020
  6494                              <1> 	; bh = 32 (function: bh = 2)
  6495                              <1> 	; 01/01/2021
  6496 0000F269 80FB0E              <1> 	cmp	bl, 14
  6497                              <1> 	;ja	sysvideo_15_190 ; bl = 15
  6498 0000F26C 0F8583020000        <1> 	jne	sysvideo_15_190 ; bl = 15
  6499                              <1> 
  6500                              <1> 	; BL = 14 = masked write of pixels
  6501                              <1> 	;	(32 bpp)
  6502                              <1> 
  6503                              <1> 	; eax = LFB video page byte count 
  6504                              <1> 	;	(4 * pixel count)
  6505                              <1> 
  6506                              <1> 	; esi = user's mask buffer address 
  6507                              <1> 	; edi = mask color
  6508                              <1> 
  6509                              <1> 	; ECX Low 16 bits = Top left column (X1 position)
  6510                              <1> 	; ECX High 16 bits = Top row (Y1 position)
  6511                              <1> 	; EDX Low 16 bits = Bottom right column (X2 position)
  6512                              <1> 	; EDX High 16 bits = Bottom row (Y2 position)
  6513                              <1> 
  6514                              <1> 	; EBX bit 16 to 18 -> mask operation/option
  6515                              <1> 	;	0 = new color (in edi)
  6516                              <1> 	;	1 = add color (in edi) -up to 0FFFFFFFFh-
  6517                              <1> 	;	2 = average color (in edi) -(current+edi)/2-
  6518                              <1> 	;	3 = sub color (in edi) -down to 0-
  6519                              <1> 	;	4 = inc	color -up to 0FFFFFFFFh-
  6520                              <1> 	;	5 = dec	color -down to 0-
  6521                              <1> 	;	6 = not color
  6522                              <1> 	;	7 = neg color 
  6523                              <1> 
  6524 0000F272 893D[7E120300]      <1> 	mov	[maskcolor], edi
  6525                              <1> 
  6526 0000F278 C1EB10              <1> 	shr	ebx, 16
  6527 0000F27B 6683E307            <1> 	and	bx, 7 ; mask option
  6528 0000F27F C0E302              <1> 	shl	bl, 2 ; * 4
  6529 0000F282 8B9B[3AF30000]      <1> 	mov	ebx, [ebx+mask_op_sub_tbl_32]
  6530                              <1> 		
  6531                              <1> 	; ebp = screen width
  6532                              <1> 	; ebx = function address
  6533                              <1> 	
  6534 0000F288 5F                  <1> 	pop	edi ; * ; LFB address
  6535                              <1> 
  6536                              <1> 	; esi = user buffer (in user's memory space)
  6537                              <1> 	;      (contains mask bits, 8 * window size)
  6538                              <1> 
  6539 0000F289 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  6540 0000F28B 7311                <1>       	jnb	short sysvideo_15_165 ; window
  6541                              <1> 
  6542 0000F28D 09D2                <1> 	or	edx, edx
  6543                              <1> 	;jnz	sysret  ; invalid !
  6544 0000F28F 7560                <1> 	jnz	short sysvideo_15_168
  6545                              <1> 
  6546                              <1> 	; full screen masked write ; edx = 0, ecx > 0
  6547                              <1> 	; eax = LFB video page size
  6548 0000F291 89C2                <1> 	mov	edx, eax
  6549 0000F293 83EA04              <1> 	sub	edx, 4 ; last dword of LFB video page
  6550 0000F296 01FA                <1> 	add	edx, edi
  6551                              <1> 	; edx = stop address 
  6552 0000F298 89E9                <1> 	mov	ecx, ebp ; screen width
  6553 0000F29A 87DD                <1> 	xchg	ebx, ebp
  6554                              <1> 	; ebx = screen width
  6555                              <1> 	; ebp = function address
  6556 0000F29C EB39                <1> 	jmp	short sysvideo_15_166
  6557                              <1> 
  6558                              <1> sysvideo_15_165:
  6559                              <1> 	; masked window write
  6560                              <1> 	;cmp	dx, bp ; end column < screen width ?
  6561                              <1> 	;jb	short sysvideo_15_165_0
  6562                              <1> 	; fix bottom right position of the window 
  6563                              <1> 	;mov	dx, bp
  6564                              <1> 	;dec	dx
  6565 0000F29E E886080000          <1> 	call	sysvideo_15_200
  6566                              <1> ;sysvideo_15_165_0:
  6567 0000F2A3 6639CA              <1> 	cmp	dx, cx
  6568 0000F2A6 7249                <1> 	jb	short sysvideo_15_168
  6569                              <1> 
  6570 0000F2A8 53                  <1> 	push	ebx ; (call) sub-function address
  6571                              <1> 
  6572 0000F2A9 01F8                <1> 	add	eax, edi
  6573                              <1> 
  6574 0000F2AB 50                  <1> 	push	eax ; the last dword of LFB + 4
  6575 0000F2AC 57                  <1> 	push	edi ; LFB start/base address
  6576                              <1> 
  6577 0000F2AD 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  6578 0000F2B0 6629C8              <1> 	sub	ax, cx  ; - top left column
  6579 0000F2B3 40                  <1> 	inc	eax ; same column no == 1 column
  6580                              <1> 	 
  6581 0000F2B4 50                  <1> 	push	eax ; pixel count per window row
  6582                              <1> 
  6583 0000F2B5 52                  <1> 	push	edx
  6584                              <1> 	;;movzx	ebx, word [ebp+2] ; screen width
  6585                              <1> 	;mov	ebx, ebp ; screen width
  6586                              <1> 	;mov	eax, ecx
  6587                              <1> 	;shr	eax, 16	; top row
  6588                              <1> 	;mul	ebx
  6589                              <1> 	;mov	dx, cx ; top left column
  6590                              <1> 	;add	eax, edx
  6591 0000F2B6 E879080000          <1> 	call	sysvideo_15_202
  6592 0000F2BB C1E002              <1> 	shl	eax, 2 ; from pixel to byte
  6593 0000F2BE 01C7                <1> 	add	edi, eax ; start address 
  6594 0000F2C0 59                  <1> 	pop	ecx ; edx
  6595                              <1> 	
  6596                              <1> 	;mov	eax, ecx
  6597                              <1> 	;shr	eax, 16 ; bottom row
  6598                              <1> 	;mul	ebx
  6599                              <1> 	;mov	dx, cx ; bottom right column
  6600                              <1> 	;add	eax, edx
  6601                              <1> 	; 30/12/2020
  6602                              <1> 	; calculate end offset
  6603 0000F2C1 E870080000          <1> 	call	sysvideo_15_203
  6604 0000F2C6 C1E002              <1> 	shl	eax, 2 ; from pixel to byte
  6605                              <1> 	
  6606 0000F2C9 5A                  <1> 	pop	edx ; pixel count per window row
  6607 0000F2CA 59                  <1> 	pop	ecx ; LFB start/base address
  6608                              <1> 
  6609 0000F2CB 01C8                <1> 	add	eax, ecx ; stop address
  6610 0000F2CD 59                  <1> 	pop	ecx ; the last dword of LFB + 4
  6611                              <1> 
  6612 0000F2CE 5D                  <1> 	pop	ebp ; (call) sub-function address
  6613                              <1> 
  6614 0000F2CF 39C8                <1> 	cmp	eax, ecx
  6615 0000F2D1 735E                <1> 	jnb	short sysvideo_15_176 ; wrong pos !
  6616                              <1> 
  6617                              <1> 	;push	edi ; start address 
  6618                              <1> 
  6619 0000F2D3 89D1                <1> 	mov	ecx, edx ; pixel count
  6620 0000F2D5 89C2                <1> 	mov	edx, eax ; stop address 
  6621                              <1> 			 ; (the last dword included)
  6622                              <1> sysvideo_15_166:
  6623                              <1> 	; ebp = (masked) color change function address
  6624                              <1> 	; esi = user's buffer address (virtual)
  6625                              <1> 	; edi = window start address in LFB
  6626                              <1> 	; ebx = screen width
  6627                              <1> 	; edx = stop address
  6628                              <1> 	; ecx = window width in pixels
  6629 0000F2D7 66C1E302            <1> 	shl	bx, 2 ; convert pixel count to byte count
  6630 0000F2DB 83C107              <1> 	add	ecx, 7
  6631 0000F2DE C1E903              <1> 	shr	ecx, 3 ; mask byte count (for user's buffer)
  6632                              <1> sysvideo_15_167:
  6633                              <1> 	; edx = stop address (the last dword included!)
  6634 0000F2E1 51                  <1> 	push	ecx ; **
  6635 0000F2E2 57                  <1> 	push	edi ; * ; start address in LFB
  6636                              <1> 	; ecx = byte count (per row)
  6637 0000F2E3 BF00600900          <1> 	mov	edi, VBE3STACKADDR ; destination
  6638                              <1> 	; user to system video/display page window transfer
  6639                              <1> 	; esi =	user buffer
  6640                              <1> 	; edi = system buffer
  6641 0000F2E8 E821200000          <1> 	call	transfer_from_user_buffer ; fast transfer
  6642                              <1> 		; eax & ecx modified, other regs preserved
  6643 0000F2ED 5F                  <1> 	pop	edi ; * ; start address in LFB
  6644 0000F2EE 7306                <1> 	jnc	short sysvideo_15_169	
  6645                              <1> 	; memory error !
  6646 0000F2F0 59                  <1> 	pop	ecx ; **
  6647                              <1> sysvideo_15_168:
  6648 0000F2F1 E9F6E5FFFF          <1> 	jmp	sysret
  6649                              <1> sysvideo_15_169:
  6650 0000F2F6 56                  <1> 	push	esi ; *** ; user's buffer address
  6651 0000F2F7 BE00600900          <1> 	mov	esi, VBE3STACKADDR ; source (in sys mem)
  6652                              <1> sysvideo_15_170:
  6653 0000F2FC 53                  <1> 	push	ebx ; **** ; screen width
  6654 0000F2FD 57                  <1> 	push	edi ; ***** ; window start address in LFB 
  6655 0000F2FE 8B1D[7E120300]      <1> 	mov	ebx, [maskcolor]
  6656                              <1> sysvideo_15_171:
  6657 0000F304 B408                <1> 	mov	ah, 8 ; 8 mask bits for 8 pixels (32 bytes)
  6658 0000F306 AC                  <1> 	lodsb
  6659                              <1> sysvideo_15_172:
  6660 0000F307 D0E8                <1> 	shr	al, 1
  6661 0000F309 7402                <1> 	jz	short sysvideo_15_173
  6662                              <1> 	;mov	[edi], ebx  ; color
  6663 0000F30B FFD5                <1> 	call	ebp ; sub function (color change function)
  6664                              <1> sysvideo_15_173:
  6665 0000F30D 8305[64030300]04    <1> 	add	dword [u.r0], 4
  6666 0000F314 83C704              <1> 	add	edi, 4
  6667 0000F317 39D7                <1> 	cmp	edi, edx ; stop address ?		
  6668 0000F319 7716                <1> 	ja	short sysvideo_15_176
  6669 0000F31B FECC                <1> 	dec	ah
  6670 0000F31D 7405                <1> 	jz	short sysvideo_15_174
  6671 0000F31F 49                  <1> 	dec	ecx
  6672 0000F320 75E5                <1> 	jnz	short sysvideo_15_172	
  6673 0000F322 EB03                <1>  	jmp	short sysvideo_15_175
  6674                              <1> sysvideo_15_174:
  6675 0000F324 49                  <1> 	dec	ecx
  6676 0000F325 75DD                <1> 	jnz	short sysvideo_15_171
  6677                              <1> sysvideo_15_175:
  6678 0000F327 5F                  <1> 	pop	edi ; ***** ; cur row in video memory window
  6679 0000F328 5B                  <1> 	pop	ebx ; **** ; screen width
  6680 0000F329 5E                  <1> 	pop	esi ; ***  ; user's buffer address
  6681 0000F32A 59                  <1> 	pop	ecx ; ** ; mask byte count (per window width)
  6682 0000F32B 01DF                <1> 	add	edi, ebx ; next row in video memory window
  6683 0000F32D 01CE                <1> 	add	esi, ecx ; next window row in user's buffer
  6684 0000F32F EBB0                <1> 	jmp	short sysvideo_15_167
  6685                              <1> sysvideo_15_176:
  6686 0000F331 5F                  <1> 	pop	edi ; ***** ; cur row in video memory window
  6687 0000F332 5B                  <1> 	pop	ebx ; **** ; window width
  6688 0000F333 5E                  <1> 	pop	esi ; *** ; user's buffer address
  6689 0000F334 59                  <1> 	pop	ecx ; ** ; mask byte count
  6690 0000F335 E9B2E5FFFF          <1> 	jmp	sysret
  6691                              <1> 
  6692                              <1> mask_op_sub_tbl_32:
  6693 0000F33A [5AF30000]          <1> 	dd	mask_op_new_32
  6694 0000F33E [5DF30000]          <1> 	dd	mask_op_add_32
  6695 0000F342 [73F30000]          <1> 	dd	mask_op_avg_32
  6696 0000F346 [68F30000]          <1> 	dd	mask_op_sub_32
  6697 0000F34A [78F30000]          <1> 	dd	mask_op_inc_32
  6698 0000F34E [7FF30000]          <1> 	dd	mask_op_dec_32
  6699 0000F352 [86F30000]          <1> 	dd	mask_op_not_32
  6700 0000F356 [89F30000]          <1> 	dd	mask_op_neg_32	
  6701                              <1> 
  6702                              <1> mask_op_new_32:
  6703 0000F35A 891F                <1> 	mov	[edi], ebx
  6704 0000F35C C3                  <1> 	retn
  6705                              <1> 
  6706                              <1> mask_op_add_32:
  6707 0000F35D 011F                <1> 	add	[edi], ebx
  6708 0000F35F 7306                <1> 	jnc	short mask_op_add_32_retn
  6709 0000F361 C707FFFFFFFF        <1> 	mov	dword [edi], 0FFFFFFFFh
  6710                              <1> mask_op_add_32_retn:
  6711 0000F367 C3                  <1> 	retn
  6712                              <1> 
  6713                              <1> mask_op_sub_32:
  6714 0000F368 291F                <1> 	sub	[edi], ebx
  6715 0000F36A 7306                <1> 	jnb	short mask_op_sub_32_retn
  6716 0000F36C C70700000000        <1> 	mov	dword [edi], 0
  6717                              <1> mask_op_sub_32_retn:
  6718 0000F372 C3                  <1> 	retn
  6719                              <1> 
  6720                              <1> mask_op_avg_32:
  6721 0000F373 011F                <1> 	add	[edi], ebx
  6722 0000F375 D11F                <1> 	rcr	dword [edi], 1
  6723 0000F377 C3                  <1> 	retn
  6724                              <1> 
  6725                              <1> mask_op_inc_32:
  6726 0000F378 FF07                <1> 	inc	dword [edi]
  6727 0000F37A 7502                <1> 	jnz	short mask_op_inc_32_retn
  6728 0000F37C FF0F                <1> 	dec	dword [edi] ; 0FFFFFFFFh
  6729                              <1> mask_op_inc_32_retn:
  6730 0000F37E C3                  <1> 	retn
  6731                              <1> 
  6732                              <1> mask_op_dec_32:
  6733 0000F37F FF0F                <1> 	dec	dword [edi]
  6734 0000F381 79E4                <1> 	jns	short mask_op_add_32_retn
  6735 0000F383 FF07                <1> 	inc	dword [edi]
  6736                              <1> mask_op_dec_32_retn:
  6737 0000F385 C3                  <1> 	retn
  6738                              <1> 
  6739                              <1> mask_op_not_32:
  6740 0000F386 F717                <1> 	not	dword [edi]
  6741 0000F388 C3                  <1> 	retn
  6742                              <1> 
  6743                              <1> mask_op_neg_32:
  6744 0000F389 F71F                <1> 	neg	dword [edi]
  6745 0000F38B C3                  <1> 	retn
  6746                              <1> 
  6747                              <1> sysvideo_15_177:
  6748                              <1> 	; 02/01/2020
  6749                              <1> 	; bh = 24 (function: bh = 2)
  6750                              <1> 	; 01/01/2021
  6751 0000F38C 80FB0E              <1> 	cmp	bl, 14
  6752                              <1> 	;ja	sysvideo_15_190 ; bl = 15
  6753 0000F38F 0F8560010000        <1> 	jne	sysvideo_15_190 ; bl = 15
  6754                              <1> 
  6755                              <1> 	; BL = 14 = masked write of pixels
  6756                              <1> 	;	(24 bpp)
  6757                              <1> 
  6758                              <1> 	; eax = LFB video page byte count 
  6759                              <1> 	;	(3 * pixel count)
  6760                              <1> 
  6761                              <1> 	; esi = user's mask buffer address 
  6762                              <1> 	; edi = mask color
  6763                              <1> 
  6764                              <1> 	; ECX Low 16 bits = Top left column (X1 position)
  6765                              <1> 	; ECX High 16 bits = Top row (Y1 position)
  6766                              <1> 	; EDX Low 16 bits = Bottom right column (X2 position)
  6767                              <1> 	; EDX High 16 bits = Bottom row (Y2 position)
  6768                              <1> 
  6769                              <1> 	; EBX bit 16 to 18 -> mask operation/option
  6770                              <1> 	;	0 = new color (in edi)
  6771                              <1> 	;	1 = add color (in edi) -up to 0FFFFFFFFh-
  6772                              <1> 	;	2 = average color (in edi) -(current+edi)/2-
  6773                              <1> 	;	3 = sub color (in edi) -down to 0-
  6774                              <1> 	;	4 = inc	color -up to 0FFFFFFFFh-
  6775                              <1> 	;	5 = dec	color -down to 0-
  6776                              <1> 	;	6 = not color
  6777                              <1> 	;	7 = neg color
  6778                              <1> 
  6779 0000F395 81E7FFFFFF00        <1> 	and	edi, 0FFFFFFh 
  6780 0000F39B 893D[7E120300]      <1> 	mov	[maskcolor], edi
  6781                              <1> 
  6782 0000F3A1 C1EB10              <1> 	shr	ebx, 16
  6783 0000F3A4 6683E307            <1> 	and	bx, 7 ; mask option
  6784 0000F3A8 C0E302              <1> 	shl	bl, 2 ; * 4
  6785 0000F3AB 8B9B[6BF40000]      <1> 	mov	ebx, [ebx+mask_op_sub_tbl_24]
  6786                              <1> 		
  6787                              <1> 	; ebp = screen width
  6788                              <1> 	; ebx = function address
  6789                              <1> 	
  6790 0000F3B1 5F                  <1> 	pop	edi ; * ; LFB address
  6791                              <1> 
  6792                              <1> 	; esi = user buffer (in user's memory space)
  6793                              <1> 	;      (contains mask bits, 8 * window size)
  6794                              <1> 
  6795 0000F3B2 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  6796 0000F3B4 7311                <1>       	jnb	short sysvideo_15_178 ; window
  6797                              <1> 
  6798 0000F3B6 09D2                <1> 	or	edx, edx
  6799                              <1> 	;jnz	sysret  ; invalid !
  6800 0000F3B8 7568                <1> 	jnz	short sysvideo_15_181
  6801                              <1> 
  6802                              <1> 	; full screen masked write ; edx = 0, ecx > 0
  6803                              <1> 	; eax = LFB video page size
  6804 0000F3BA 89C2                <1> 	mov	edx, eax
  6805 0000F3BC 83EA03              <1> 	sub	edx, 3 ; last 3 bytes of LFB video page
  6806 0000F3BF 01FA                <1> 	add	edx, edi
  6807                              <1> 	; edx = stop address 
  6808 0000F3C1 89E9                <1> 	mov	ecx, ebp ; screen width
  6809 0000F3C3 87DD                <1> 	xchg	ebx, ebp
  6810                              <1> 	; ebx = screen width
  6811                              <1> 	; ebp = function address
  6812 0000F3C5 EB3F                <1> 	jmp	short sysvideo_15_179
  6813                              <1> 
  6814                              <1> sysvideo_15_178:
  6815                              <1> 	; masked window write
  6816                              <1> 	;cmp	dx, bp ; end column < screen width ?
  6817                              <1> 	;jb	short sysvideo_15_178_0
  6818                              <1> 	; fix bottom right position of the window 
  6819                              <1> 	;mov	dx, bp
  6820                              <1> 	;dec	dx
  6821 0000F3C7 E85D070000          <1> 	call	sysvideo_15_200
  6822                              <1> ;sysvideo_15_178_0:
  6823 0000F3CC 6639CA              <1> 	cmp	dx, cx
  6824 0000F3CF 7251                <1> 	jb	short sysvideo_15_181
  6825                              <1> 
  6826 0000F3D1 53                  <1> 	push	ebx ; (call) sub-function address
  6827                              <1> 
  6828 0000F3D2 01F8                <1> 	add	eax, edi
  6829                              <1> 
  6830 0000F3D4 50                  <1> 	push	eax ; the last 3 bytes of LFB + 3
  6831 0000F3D5 57                  <1> 	push	edi ; LFB start/base address
  6832                              <1> 
  6833 0000F3D6 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  6834 0000F3D9 6629C8              <1> 	sub	ax, cx  ; - top left column
  6835 0000F3DC 40                  <1> 	inc	eax ; same column no == 1 column
  6836                              <1> 	 
  6837 0000F3DD 50                  <1> 	push	eax ; pixel count per window row
  6838                              <1> 
  6839 0000F3DE 52                  <1> 	push	edx
  6840                              <1> 	;;movzx	ebx, word [ebp+2] ; screen width
  6841                              <1> 	;mov	ebx, ebp ; screen width
  6842                              <1> 	;mov	eax, ecx
  6843                              <1> 	;shr	eax, 16	; top row
  6844                              <1> 	;mul	ebx
  6845                              <1> 	;mov	dx, cx ; top left column
  6846                              <1> 	;add	eax, edx
  6847 0000F3DF E850070000          <1> 	call	sysvideo_15_202
  6848 0000F3E4 89C1                <1> 	mov	ecx, eax
  6849 0000F3E6 D1E0                <1> 	shl	eax, 1 
  6850 0000F3E8 01C8                <1> 	add	eax, ecx ; from pixel to byte
  6851 0000F3EA 01C7                <1> 	add	edi, eax ; start address 
  6852 0000F3EC 59                  <1> 	pop	ecx ; edx
  6853                              <1> 	
  6854                              <1> 	;mov	eax, ecx
  6855                              <1> 	;shr	eax, 16 ; bottom row
  6856                              <1> 	;mul	ebx
  6857                              <1> 	;mov	dx, cx ; bottom right column
  6858                              <1> 	;add	eax, edx
  6859                              <1> 	; 30/12/2020
  6860                              <1> 	; calculate end offset
  6861 0000F3ED E844070000          <1> 	call	sysvideo_15_203
  6862 0000F3F2 89C2                <1> 	mov	edx, eax
  6863 0000F3F4 D1E0                <1> 	shl	eax, 1 
  6864 0000F3F6 01D0                <1> 	add	eax, edx ; from pixel to byte
  6865                              <1> 	
  6866 0000F3F8 5A                  <1> 	pop	edx ; pixel count per window row
  6867 0000F3F9 59                  <1> 	pop	ecx ; LFB start/base address
  6868                              <1> 
  6869 0000F3FA 01C8                <1> 	add	eax, ecx ; stop address
  6870 0000F3FC 59                  <1> 	pop	ecx ; the last 3 bytes of LFB + 3
  6871                              <1> 
  6872 0000F3FD 5D                  <1> 	pop	ebp ; (call) sub-function address
  6873                              <1> 
  6874 0000F3FE 39C8                <1> 	cmp	eax, ecx
  6875 0000F400 7360                <1> 	jnb	short sysvideo_15_189 ; wrong pos !
  6876                              <1> 
  6877                              <1> 	;push	edi ; start address 
  6878                              <1> 
  6879 0000F402 89D1                <1> 	mov	ecx, edx ; pixel count
  6880 0000F404 89C2                <1> 	mov	edx, eax ; stop address 
  6881                              <1> 			 ; (the last 3 bytes included)
  6882                              <1> sysvideo_15_179:
  6883                              <1> 	; ebp = (masked) color change function address
  6884                              <1> 	; esi = user's buffer address (virtual)
  6885                              <1> 	; edi = window start address in LFB
  6886                              <1> 	; ebx = screen width
  6887                              <1> 	; edx = stop address
  6888                              <1> 	; ecx = window width in pixels
  6889 0000F406 89D8                <1> 	mov	eax, ebx
  6890 0000F408 01C3                <1> 	add	ebx, eax
  6891 0000F40A 01C3                <1> 	add	ebx, eax ; convert pixel count to byte count
  6892 0000F40C 83C107              <1> 	add	ecx, 7
  6893 0000F40F C1E903              <1> 	shr	ecx, 3 ; mask byte count (for user's buffer)
  6894                              <1> sysvideo_15_180:
  6895                              <1> 	; edx = stop address (the last 3 bytes included!)
  6896 0000F412 51                  <1> 	push	ecx ; **
  6897 0000F413 57                  <1> 	push	edi ; * ; start address in LFB
  6898                              <1> 	; ecx = byte count (per row)
  6899 0000F414 BF00600900          <1> 	mov	edi, VBE3STACKADDR ; destination
  6900                              <1> 	; user to system video/display page window transfer
  6901                              <1> 	; esi =	user buffer
  6902                              <1> 	; edi = system buffer
  6903 0000F419 E8F01E0000          <1> 	call	transfer_from_user_buffer ; fast transfer
  6904                              <1> 		; eax & ecx modified, other regs preserved
  6905 0000F41E 5F                  <1> 	pop	edi ; * ; start address in LFB
  6906 0000F41F 7306                <1> 	jnc	short sysvideo_15_182	
  6907                              <1> 	; memory error !
  6908 0000F421 59                  <1> 	pop	ecx ; **
  6909                              <1> sysvideo_15_181:
  6910 0000F422 E9C5E4FFFF          <1> 	jmp	sysret
  6911                              <1> sysvideo_15_182:
  6912 0000F427 56                  <1> 	push	esi ; *** ; user's buffer address
  6913 0000F428 BE00600900          <1> 	mov	esi, VBE3STACKADDR ; source (in sys mem)
  6914                              <1> sysvideo_15_183:
  6915 0000F42D 53                  <1> 	push	ebx ; **** ; screen width
  6916 0000F42E 57                  <1> 	push	edi ; ***** ; window start address in LFB 
  6917 0000F42F 8B1D[7E120300]      <1> 	mov	ebx, [maskcolor]
  6918                              <1> sysvideo_15_184:
  6919 0000F435 B408                <1> 	mov	ah, 8 ; 8 mask bits for 8 pixels (24 bytes)
  6920 0000F437 AC                  <1> 	lodsb
  6921                              <1> sysvideo_15_185:
  6922 0000F438 D0E8                <1> 	shr	al, 1
  6923 0000F43A 7402                <1> 	jz	short sysvideo_15_186
  6924                              <1> 	;mov	[edi], ebx  ; color
  6925 0000F43C FFD5                <1> 	call	ebp ; sub function (color change function)
  6926                              <1> sysvideo_15_186:
  6927 0000F43E 8305[64030300]03    <1> 	add	dword [u.r0], 3
  6928 0000F445 83C703              <1> 	add	edi, 3
  6929 0000F448 39D7                <1> 	cmp	edi, edx ; stop address ?		
  6930 0000F44A 7716                <1> 	ja	short sysvideo_15_189
  6931 0000F44C FECC                <1> 	dec	ah
  6932 0000F44E 7405                <1> 	jz	short sysvideo_15_187
  6933 0000F450 49                  <1> 	dec	ecx
  6934 0000F451 75E5                <1> 	jnz	short sysvideo_15_185	
  6935 0000F453 EB03                <1>  	jmp	short sysvideo_15_188
  6936                              <1> sysvideo_15_187:
  6937 0000F455 49                  <1> 	dec	ecx
  6938 0000F456 75DD                <1> 	jnz	short sysvideo_15_184
  6939                              <1> sysvideo_15_188:
  6940 0000F458 5F                  <1> 	pop	edi ; ***** ; cur row in video memory window
  6941 0000F459 5B                  <1> 	pop	ebx ; **** ; screen width
  6942 0000F45A 5E                  <1> 	pop	esi ; ***  ; user's buffer address
  6943 0000F45B 59                  <1> 	pop	ecx ; ** ; mask byte count (per window width)
  6944 0000F45C 01DF                <1> 	add	edi, ebx ; next row in video memory window
  6945 0000F45E 01CE                <1> 	add	esi, ecx ; next window row in user's buffer
  6946 0000F460 EBB0                <1> 	jmp	short sysvideo_15_180
  6947                              <1> sysvideo_15_189:
  6948 0000F462 5F                  <1> 	pop	edi ; ***** ; cur row in video memory window
  6949 0000F463 5B                  <1> 	pop	ebx ; **** ; window width
  6950 0000F464 5E                  <1> 	pop	esi ; *** ; user's buffer address
  6951 0000F465 59                  <1> 	pop	ecx ; ** ; mask byte count
  6952 0000F466 E981E4FFFF          <1> 	jmp	sysret
  6953                              <1> 
  6954                              <1> mask_op_sub_tbl_24:
  6955 0000F46B [8BF40000]          <1> 	dd	mask_op_new_24
  6956 0000F46F [94F40000]          <1> 	dd	mask_op_add_24
  6957 0000F473 [BEF40000]          <1> 	dd	mask_op_avg_24
  6958 0000F477 [AEF40000]          <1> 	dd	mask_op_sub_24
  6959 0000F47B [CCF40000]          <1> 	dd	mask_op_inc_24
  6960 0000F47F [D9F40000]          <1> 	dd	mask_op_dec_24
  6961 0000F483 [E7F40000]          <1> 	dd	mask_op_not_24
  6962 0000F487 [EEF40000]          <1> 	dd	mask_op_neg_24	
  6963                              <1> 
  6964                              <1> mask_op_new_24:
  6965 0000F48B 8127000000FF        <1> 	and	dword [edi], 0FF000000h
  6966 0000F491 091F                <1> 	or	dword [edi], ebx ; ebx <= 0FFFFFFh
  6967                              <1> 	;add	dword [edi], ebx ; ebx <= 0FFFFFFh
  6968 0000F493 C3                  <1> 	retn
  6969                              <1> 
  6970                              <1> mask_op_add_24:
  6971 0000F494 50                  <1> 	push	eax
  6972 0000F495 8B07                <1> 	mov	eax, [edi]
  6973 0000F497 0D000000FF          <1> 	or	eax, 0FF000000h
  6974 0000F49C 01D8                <1> 	add	eax, ebx
  6975 0000F49E 7303                <1> 	jnc	short mask_op_add_24_0
  6976 0000F4A0 31C0                <1> 	xor	eax, eax
  6977                              <1> mask_op_inc_24_1:
  6978 0000F4A2 48                  <1> 	dec	eax ; 0FFFFFFFFh
  6979                              <1> mask_op_add_24_0:	
  6980                              <1> mask_op_sub_24_0:
  6981                              <1> mask_op_avg_24_0:
  6982                              <1> mask_op_inc_24_0:
  6983                              <1> mask_op_dec_24_0:
  6984                              <1> mask_op_not_24_0:
  6985                              <1> mask_op_neg_24_0:
  6986 0000F4A3 668907              <1> 	mov	[edi], ax
  6987 0000F4A6 C1E810              <1> 	shr	eax, 16
  6988 0000F4A9 884702              <1> 	mov	[edi+2], al
  6989 0000F4AC 58                  <1> 	pop	eax
  6990 0000F4AD C3                  <1> 	retn
  6991                              <1> 
  6992                              <1> mask_op_sub_24:
  6993 0000F4AE 50                  <1> 	push	eax
  6994 0000F4AF 8B07                <1> 	mov	eax, [edi]
  6995 0000F4B1 25FFFFFF00          <1> 	and	eax, 0FFFFFFh
  6996 0000F4B6 29D8                <1> 	sub	eax, ebx
  6997 0000F4B8 73E9                <1> 	jnb	short mask_op_sub_24_0
  6998 0000F4BA 31C0                <1> 	xor	eax, eax ; 0
  6999 0000F4BC EBE5                <1> 	jmp	short mask_op_sub_24_0
  7000                              <1> ;mask_op_sub_24_0:	
  7001                              <1> 	;mov	[edi], ax
  7002                              <1> 	;shr	eax, 16
  7003                              <1> 	;mov	[edi+2], al
  7004                              <1> 	;pop	eax
  7005                              <1> 	;retn
  7006                              <1> 
  7007                              <1> mask_op_avg_24:
  7008 0000F4BE 50                  <1> 	push	eax
  7009 0000F4BF 8B07                <1> 	mov	eax, [edi]
  7010 0000F4C1 25FFFFFF00          <1> 	and	eax, 0FFFFFFh
  7011 0000F4C6 01D8                <1> 	add	eax, ebx
  7012 0000F4C8 D1D8                <1> 	rcr	eax, 1
  7013 0000F4CA EBD7                <1> 	jmp	short mask_op_avg_24_0
  7014                              <1> 	;mov	[edi], ax
  7015                              <1> 	;shr	eax, 16
  7016                              <1> 	;mov	[edi+2], al
  7017                              <1> 	;pop	eax
  7018                              <1> 	;retn
  7019                              <1> 
  7020                              <1> mask_op_inc_24:
  7021 0000F4CC 50                  <1> 	push	eax
  7022 0000F4CD 8B07                <1> 	mov	eax, [edi]
  7023 0000F4CF 0D000000FF          <1> 	or	eax, 0FF000000h
  7024 0000F4D4 40                  <1> 	inc	eax
  7025 0000F4D5 75CC                <1> 	jnz	short mask_op_inc_24_0
  7026                              <1> 	;dec	eax ; 0FFFFFFFFh
  7027 0000F4D7 EBC9                <1> 	jmp	short mask_op_inc_24_1
  7028                              <1> ;mask_op_inc_24_0:
  7029                              <1> 	;mov	[edi], ax
  7030                              <1> 	;shr	eax, 16
  7031                              <1> 	;mov	[edi+2], al
  7032                              <1> 	;pop	eax
  7033                              <1> 	;retn
  7034                              <1> 
  7035                              <1> mask_op_dec_24:
  7036 0000F4D9 50                  <1> 	push	eax
  7037 0000F4DA 8B07                <1> 	mov	eax, [edi]
  7038 0000F4DC 25FFFFFF00          <1> 	and	eax, 0FFFFFFh
  7039 0000F4E1 48                  <1> 	dec	eax
  7040 0000F4E2 79BF                <1> 	jns	short mask_op_dec_24_0
  7041 0000F4E4 40                  <1> 	inc	eax ; eax = 0
  7042 0000F4E5 EBBC                <1> 	jmp	short mask_op_dec_24_0
  7043                              <1> ;mask_op_dec_24_0:
  7044                              <1> 	;mov	[edi], ax
  7045                              <1> 	;shr	eax, 16
  7046                              <1> 	;mov	[edi+2], al
  7047                              <1> 	;pop	eax
  7048                              <1> 	;retn
  7049                              <1> 
  7050                              <1> mask_op_not_24:
  7051 0000F4E7 50                  <1> 	push	eax
  7052 0000F4E8 8B07                <1> 	mov	eax, [edi]
  7053 0000F4EA F7D0                <1> 	not	eax
  7054 0000F4EC EBB5                <1> 	jmp	short mask_op_not_24_0
  7055                              <1> ;mask_op_not_24_0:
  7056                              <1> 	;mov	[edi], ax
  7057                              <1> 	;shr	eax, 16
  7058                              <1> 	;mov	[edi+2], al
  7059                              <1> 	;pop	eax
  7060                              <1> 	;retn
  7061                              <1> 
  7062                              <1> mask_op_neg_24:
  7063 0000F4EE 50                  <1> 	push	eax
  7064 0000F4EF 8B07                <1> 	mov	eax, [edi]
  7065                              <1> 	;and	eax, 0FFFFFFh
  7066 0000F4F1 F7D8                <1> 	neg	eax 
  7067 0000F4F3 EBAE                <1> 	jmp	short mask_op_neg_24_0
  7068                              <1> ;mask_op_neg_24_0:
  7069                              <1> 	;mov	[edi], ax
  7070                              <1> 	;shr	eax, 16
  7071                              <1> 	;mov	[edi+2], al
  7072                              <1> 	;pop	eax
  7073                              <1> 	;retn
  7074                              <1> 
  7075                              <1> sysvideo_15_190:
  7076                              <1> 	; 05/01/2021 ([ufont])
  7077                              <1> 	; 01/01/2021
  7078                              <1> 	; BL = 15 -> Write character (font) 
  7079                              <1> 	;		-in current mode-
  7080                              <1> 	; ECX Low 16 bits = Top left column (X1 position)
  7081                              <1> 	; ECX High 16 bits = Top row (Y1 position)
  7082                              <1> 	;  DL = Character's ASCII code
  7083                              <1> 	; EDX High 24 bits = Character's color
  7084                              <1> 	; EBX bit 16 -> character size option
  7085                              <1> 	;     0 = 8x16 system character font
  7086                              <1> 	;     1 = 8x8 system character font
  7087                              <1> 	; EBX bit 17 & 18 -> scale	
  7088                              <1> 	;     0 = 1/1 (8 pixels per char row)
  7089                              <1> 	;     1 = 2/1 (16 pixels per char row)
  7090                              <1> 	;     2 = 4/1 (32 pixels per char row) 
  7091                              <1> 	;     3 = 8/1 (64 pixels per char row)
  7092                              <1> 	; EBX bit 19 -> user font option (1 = user font)	
  7093                              <1> 
  7094                              <1> 	; eax = LFB video page byte count
  7095                              <1> 	; ebp = screen width 
  7096                              <1> 
  7097                              <1> 	;  bh = bits per pixel (8,16,24,32) 
  7098                              <1> 
  7099 0000F4F5 5F                  <1> 	pop	edi ; * ; LFB address
  7100                              <1> 
  7101 0000F4F6 8915[7E120300]      <1> 	mov	[maskcolor], edx ; save as temporary
  7102                              <1> 
  7103 0000F4FC 53                  <1> 	push	ebx  ; + ; save bits per pixel value
  7104                              <1> 
  7105                              <1> 	; calculate scaled character size
  7106 0000F4FD 89DA                <1> 	mov	edx, ebx
  7107 0000F4FF C1EA10              <1> 	shr	edx, 16
  7108 0000F502 6683FA0F            <1> 	cmp	dx, 15 ; 05/01/2021	
  7109 0000F506 7605                <1> 	jna	short sysvideo_15_191
  7110                              <1> 	; invalid
  7111 0000F508 E9DFE3FFFF          <1> 	jmp	sysret
  7112                              <1> sysvideo_15_191:
  7113                              <1> 	; 05/01/2021
  7114 0000F50D 8025[82120300]FC    <1> 	and	byte [ufont], ~3 ; bit 0&1 = 0
  7115 0000F514 F6C208              <1> 	test	dl, 8 ; user font ?
  7116 0000F517 742A                <1> 	jz	short sysvideo_15_191_2 ; use sys font
  7117 0000F519 80E207              <1> 	and	dl, 7 ; clear bit 19
  7118 0000F51C F6C201              <1> 	test	dl, 1
  7119 0000F51F 7412                <1> 	jz	short sysvideo_15_191_0 ; 8x16
  7120                              <1> 	; 8x8
  7121 0000F521 F605[82120300]08    <1> 	test	byte [ufont], 8 ; is 8x8 user font ready ? 
  7122 0000F528 7419                <1> 	jz	short sysvideo_15_191_2 
  7123                              <1> 				; no, use system font
  7124                              <1> 	; yes
  7125 0000F52A 800D[82120300]01    <1> 	or	byte [ufont], 1 ; bit 0 = 8x8 pixels char
  7126 0000F531 EB10                <1> 	jmp	short sysvideo_15_191_2
  7127                              <1> sysvideo_15_191_0: 
  7128 0000F533 F605[82120300]10    <1> 	test	byte [ufont], 16 ; is 8x16 user font ready ? 
  7129 0000F53A 7407                <1> 	jz	short sysvideo_15_191_2
  7130                              <1> 				; no, use system font
  7131                              <1> 	; yes
  7132 0000F53C 800D[82120300]02    <1> 	or	byte [ufont], 2 ; bit 1 = 8x16 pixels char	
  7133                              <1> sysvideo_15_191_2:	
  7134 0000F543 BE[61F80000]        <1> 	mov	esi, char_size_option	
  7135 0000F548 D0E2                <1> 	shl	dl, 1
  7136 0000F54A 01D6                <1> 	add	esi, edx
  7137 0000F54C 668B16              <1> 	mov	dx, [esi] ; dh = rows, dl = pixels
  7138 0000F54F C1E208              <1> 	shl	edx, 8
  7139 0000F552 86F2                <1> 	xchg	dh, dl ; dh = 0, dl = columns
  7140                              <1> 		; EDX high word = rows
  7141                              <1> 		; DX = columns (pixels per row)
  7142                              <1> 	
  7143 0000F554 52                  <1> 	push	edx ; ++
  7144 0000F555 6601CA              <1> 	add	dx, cx ; dx = bottom right column  
  7145 0000F558 7307                <1> 	jnc	short sysvideo_15_193
  7146                              <1> sysvideo_15_192:
  7147 0000F55A 5A                  <1> 	pop	edx ; ++
  7148 0000F55B 5B                  <1> 	pop	ebx ; +
  7149 0000F55C E98BE3FFFF          <1> 	jmp	sysret
  7150                              <1> sysvideo_15_193: 
  7151 0000F561 6639EA              <1> 	cmp	dx, bp ; dx > screen width ?
  7152 0000F564 77F4                <1> 	ja	short sysvideo_15_192 ; yes, wrong pos !
  7153 0000F566 C1CA10              <1> 	ror	edx, 16
  7154 0000F569 C1C910              <1> 	ror	ecx, 16
  7155 0000F56C 6601CA              <1> 	add	dx, cx ; dx = bottom row
  7156 0000F56F 72E9                <1> 	jc	short sysvideo_15_192 ; wrong pos !
  7157 0000F571 C1C210              <1> 	rol	edx, 16
  7158 0000F574 C1C110              <1> 	rol	ecx, 16	
  7159                              <1> 	
  7160 0000F577 50                  <1> 	push	eax ; +++  ; LFB video page size in bytes
  7161 0000F578 52                  <1> 	push	edx ; ++++ ; bottom row, right column
  7162                              <1> 	;mov	ebx, ebp ; screen width
  7163                              <1> 	;mov	eax, ecx
  7164                              <1> 	;shr	eax, 16  ; top row
  7165                              <1> 	;mul	ebx
  7166                              <1> 	;mov	dx, cx ; top left column
  7167                              <1> 	;add	eax, edx
  7168 0000F579 E8B6050000          <1> 	call	sysvideo_15_202
  7169 0000F57E 59                  <1> 	pop	ecx ; ++++ ; edx
  7170 0000F57F 01C7                <1> 	add	edi, eax ; edi = LFB start address
  7171 0000F581 3B0424              <1> 	cmp	eax, [esp]  ; < LFB page size ?
  7172 0000F584 7203                <1> 	jb	short sysvideo_15_194  ; yes, proper position
  7173 0000F586 58                  <1> 	pop	eax ; +++
  7174 0000F587 EBD1                <1> 	jmp	short sysvideo_15_192
  7175                              <1> sysvideo_15_194:
  7176                              <1> 	;mov	eax, ecx
  7177                              <1> 	;shr	eax, 16 ; bottom row
  7178                              <1> 	;mul	ebx
  7179                              <1> 	;mov	dx, cx ; bottom right column
  7180                              <1> 	;add	eax, edx
  7181                              <1> 	; 30/12/2020
  7182                              <1> 	; calculate end offset
  7183 0000F589 E8A8050000          <1> 	call	sysvideo_15_203
  7184 0000F58E 3B0424              <1> 	cmp	eax, [esp] ; < LFB page size ?
  7185 0000F591 58                  <1>  	pop	eax ; +++
  7186 0000F592 73C6                <1> 	jnb	short sysvideo_15_192 ; no, wrong position !
  7187                              <1> 
  7188                              <1> 	; edi = character start position
  7189                              <1> 	;	(top left)
  7190                              <1> 
  7191                              <1> 	; ebp = screen width 
  7192                              <1> 
  7193 0000F594 5A                  <1> 	pop	edx ; ++ ; char columns (pixels), rows 
  7194                              <1> 
  7195 0000F595 5B                  <1> 	pop	ebx ; +	; bh = bits per pixel
  7196                              <1> 
  7197 0000F596 80FF08              <1> 	cmp	bh, 8
  7198 0000F599 7614                <1> 	jna	short sysvideo_15_196
  7199 0000F59B 89E8                <1> 	mov	eax, ebp
  7200 0000F59D D1E5                <1> 	shl	ebp, 1 
  7201 0000F59F 80FF10              <1> 	cmp	bh, 16
  7202 0000F5A2 760B                <1> 	jna	short sysvideo_15_196
  7203 0000F5A4 80FF18              <1> 	cmp	bh, 24
  7204 0000F5A7 7504                <1> 	jne	short sysvideo_15_195
  7205 0000F5A9 01C5                <1> 	add	ebp, eax ; * 3
  7206 0000F5AB EB02                <1> 	jmp	short sysvideo_15_196
  7207                              <1> sysvideo_15_195:
  7208                              <1> 	; bh = 32
  7209 0000F5AD D1E5                <1> 	shl	ebp, 1
  7210                              <1> sysvideo_15_196:
  7211                              <1> 	; ebp = screen width (converted to bytes)
  7212                              <1> 	; edi = character start position in LFB
  7213                              <1> 	;  bh = bytes per pixel	
  7214                              <1> 
  7215 0000F5AF A1[7E120300]        <1> 	mov	eax, [maskcolor] 	
  7216 0000F5B4 0FB6F0              <1> 	movzx	esi, al  ; character (ASCII code)
  7217 0000F5B7 C1E808              <1> 	shr	eax, 8	
  7218 0000F5BA A3[7E120300]        <1> 	mov	[maskcolor], eax
  7219                              <1> 	
  7220 0000F5BF 0FB7C2              <1> 	movzx	eax, dx ; columns (pixels)
  7221 0000F5C2 C1EA10              <1> 	shr	edx, 16 ; rows	
  7222                              <1> 
  7223                              <1> 	; edi = LFB start address (top left column)
  7224                              <1> 	
  7225 0000F5C5 39D0                <1> 	cmp	eax, edx ; 8x8 or 8x16 font
  7226 0000F5C7 0F846B010000        <1> 	je	sysvideo_15_197 ; 8x8 font
  7227                              <1> 
  7228                              <1> 	; 8x16 character font
  7229 0000F5CD 66C1E604            <1> 	shl	si, 4 ; * 16 (character font size)
  7230                              <1> 
  7231                              <1> 	; 05/01/2021
  7232                              <1> 		; test 8x16 user font is ready flag
  7233 0000F5D1 F605[82120300]02    <1> 	test	byte [ufont], 2
  7234 0000F5D8 7408                <1> 	jz	short sysvideo_15_196_1
  7235                              <1> 	; 8x16 user font available
  7236 0000F5DA 81C600400900        <1> 	add	esi, VGAFONT16USER
  7237 0000F5E0 EB06                <1> 	jmp	short sysvideo_15_196_2
  7238                              <1> sysvideo_15_196_1: 
  7239 0000F5E2 81C6[246E0100]      <1> 	add	esi, vgafont16
  7240                              <1> sysvideo_15_196_2: 
  7241 0000F5E8 8B15[7E120300]      <1> 	mov	edx, [maskcolor]
  7242                              <1> 
  7243 0000F5EE B110                <1> 	mov	cl, 16	; 16 rows (8x16 font)
  7244                              <1> 
  7245 0000F5F0 80FF08              <1> 	cmp	bh, 8	; 8bpp ?
  7246 0000F5F3 7754                <1> 	ja	short sysvideo_15_196_22 ; no
  7247                              <1> 
  7248 0000F5F5 3C08                <1> 	cmp	al, 8	; 8 pixels per row ?
  7249 0000F5F7 7711                <1> 	ja	short sysvideo_15_196_4	; no
  7250                              <1> 
  7251                              <1> 	; 8 pixels per row
  7252                              <1> ;sysvideo_15_196_0:
  7253                              <1> ;	lodsb
  7254                              <1> ;	push	edi
  7255                              <1> ;	mov	ah, 8
  7256                              <1> ;sysvideo_15_196_1:
  7257                              <1> ;	shr	al, 1
  7258                              <1> ;	jnc	short sysvideo_15_196_2
  7259                              <1> ;	mov	[edi], dl 
  7260                              <1> ;		; character pixel/forecolor,
  7261                              <1> ;		; 8 bpp (256 colors)
  7262                              <1> ;sysvideo_15_196_2:	
  7263                              <1> ;	inc	edi
  7264                              <1> ;	dec	ah
  7265                              <1> ;	jnz	short sysvideo_15_196_1 ; next pixel of (same) row	
  7266                              <1> ;	pop	edi
  7267                              <1> ;	add	edi, ebp ; next row (same column position)
  7268                              <1> ;	dec	cl
  7269                              <1> ;	jnz	short sysvideo_15_196_0
  7270                              <1> ;				; next row of the character font
  7271 0000F5F9 E873020000          <1> 	call	sysvideo_15_196_0
  7272                              <1> 
  7273                              <1> sysvideo_15_196_3:
  7274                              <1> 	; 1*16*1 = 16 bytes (128 pixels)
  7275 0000F5FE C605[64030300]10    <1> 	mov	byte [u.r0], 16 ; font size = 16 bytes
  7276 0000F605 E9E2E2FFFF          <1> 	jmp	sysret
  7277                              <1> 
  7278                              <1> sysvideo_15_196_4:
  7279 0000F60A 3C10                <1> 	cmp	al, 16
  7280 0000F60C 7711                <1> 	ja	short sysvideo_15_196_10 ; >= 32 pixels per row
  7281                              <1> 	; 16 pixels per row
  7282                              <1> ;sysvideo_15_196_4_0:
  7283                              <1> ;	mov	dh, dl
  7284                              <1> ;sysvideo_15_196_5:
  7285                              <1> ;	mov	bl, 2  ; 2 rows with same pixels
  7286                              <1> ;sysvideo_15_196_6:	
  7287                              <1> ;	mov	al, [esi]	
  7288                              <1> ;	push	edi
  7289                              <1> ;	mov	ah, 8
  7290                              <1> ;sysvideo_15_196_7:
  7291                              <1> ;	shr	al, 1
  7292                              <1> ;	jnc	short sysvideo_15_196_8
  7293                              <1> ;	; 2 pixels with same forecolor
  7294                              <1> ;	mov	[edi], dx
  7295                              <1> ;		; character pixel/forecolor,
  7296                              <1> ;		; 8 bpp (256 colors)
  7297                              <1> ;sysvideo_15_196_8:	
  7298                              <1> ;	inc	edi
  7299                              <1> ;	inc	edi
  7300                              <1> ;	dec	ah
  7301                              <1> ;	jnz	short sysvideo_15_196_7 ; next pixel of (same) row	
  7302                              <1> ;	pop	edi
  7303                              <1> ;	add	edi, ebp ; next row
  7304                              <1> ;	dec	bl
  7305                              <1> ;	jnz	short sysvideo_15_196_6 ; same pixels for next row
  7306                              <1> ;	inc	esi
  7307                              <1> ;	dec	cl
  7308                              <1> ;	jnz	short sysvideo_15_196_5 ; next row of the character font
  7309 0000F60E E875020000          <1> 	call	sysvideo_15_196_4_0
  7310                              <1> 
  7311                              <1> sysvideo_15_196_9:
  7312                              <1> 	; 2*16*2 = 64 bytes (512 pixels)
  7313 0000F613 C605[64030300]40    <1> 	mov	byte [u.r0], 64 ; font size = 64 bytes
  7314 0000F61A E9CDE2FFFF          <1> 	jmp	sysret
  7315                              <1> 
  7316                              <1> sysvideo_15_196_10:
  7317 0000F61F 3C20                <1> 	cmp	al, 32
  7318 0000F621 7713                <1> 	ja	short sysvideo_15_196_16 ; 64 pixels per row
  7319                              <1> 	; 32 pixels per row
  7320                              <1> ;sysvideo_15_196_10_0:
  7321                              <1> ;	mov	dh, dl
  7322                              <1> ;	ror	edx, 8  ; byte 2 -> dh, dl -> byte 3
  7323                              <1> ;			; dh -> dl
  7324                              <1> ;	mov	dh, dl	; byte 1 -> dl 
  7325                              <1> ;sysvideo_15_196_11:
  7326                              <1> ;	mov	bl, 4	; 4 rows with same pixels
  7327                              <1> ;sysvideo_15_196_12:	
  7328                              <1> ;	mov	al, [esi]	
  7329                              <1> ;	push	edi
  7330                              <1> ;	mov	ah, 8
  7331                              <1> ;sysvideo_15_196_13:
  7332                              <1> ;	shr	al, 1
  7333                              <1> ;	jnc	short sysvideo_15_196_14
  7334                              <1> ;	; 4 pixels with same forecolor
  7335                              <1> ;	mov	[edi], edx 
  7336                              <1> ;		; character pixel/forecolor,
  7337                              <1> ;		; 8 bpp (256 colors)
  7338                              <1> ;sysvideo_15_196_14:	
  7339                              <1> ;	add	edi, 4
  7340                              <1> ;	dec	ah
  7341                              <1> ;	jnz	short sysvideo_15_196_13 ; next pixel of (same) row	
  7342                              <1> ;	pop	edi
  7343                              <1> ;	add	edi, ebp ; next row
  7344                              <1> ;	dec	bl
  7345                              <1> ;	jnz	short sysvideo_15_196_12 ; same pixels for next row
  7346                              <1> ;	inc	esi
  7347                              <1> ;	dec	cl
  7348                              <1> ;	jnz	short sysvideo_15_196_11 ; next row of the character font
  7349 0000F623 E883020000          <1> 	call	sysvideo_15_196_10_0
  7350                              <1> 
  7351                              <1> sysvideo_15_196_15:
  7352                              <1> 	; 4*16*4 = 256 bytes (2048 pixels)
  7353 0000F628 66C705[64030300]00- <1> 	mov	word [u.r0], 256 ; font size = 256 bytes
  7353 0000F630 01                  <1>
  7354 0000F631 E9B6E2FFFF          <1> 	jmp	sysret
  7355                              <1> 
  7356                              <1> sysvideo_15_196_16:
  7357                              <1> ;	; 64 pixels per row
  7358                              <1> ;	mov	dh, dl
  7359                              <1> ;	ror	edx, 8  ; byte 2 -> dh, dl -> byte 3
  7360                              <1> ;			; dh -> dl
  7361                              <1> ;	mov	dh, dl	; byte 1 -> dl 
  7362                              <1> ;sysvideo_15_196_17:
  7363                              <1> ;	mov	bl, 8	; 8 rows with same pixels
  7364                              <1> ;sysvideo_15_196_18:	
  7365                              <1> ;	mov	al, [esi]	
  7366                              <1> ;	push	edi
  7367                              <1> ;	mov	ah, 8
  7368                              <1> ;sysvideo_15_196_19:
  7369                              <1> ;	shr	al, 1
  7370                              <1> ;	jnc	short sysvideo_15_196_20
  7371                              <1> ;	; 8 pixels with same forecolor
  7372                              <1> ;	mov	[edi], edx 
  7373                              <1> ;		; character pixel/forecolor,
  7374                              <1> ;		; 8 bpp (256 colors)
  7375                              <1> ;	mov	[edi+4], edx 
  7376                              <1> ;		; character pixel/forecolor,
  7377                              <1> ;		; 8 bpp (256 colors)
  7378                              <1> ;sysvideo_15_196_20:	
  7379                              <1> ;	add	edi, 8
  7380                              <1> ;	dec	ah
  7381                              <1> ;	jnz	short sysvideo_15_196_19 ; next pixel of (same) row	
  7382                              <1> ;	pop	edi
  7383                              <1> ;	add	edi, ebp ; next row
  7384                              <1> ;	dec	bl
  7385                              <1> ;	jnz	short sysvideo_15_196_18 ; same pixels for next row
  7386                              <1> ;	inc	esi
  7387                              <1> ;	dec	cl
  7388                              <1> ;	jnz	short sysvideo_15_196_17 ; next row of the character font
  7389 0000F636 E898020000          <1> 	call	sysvideo_15_196_16_0
  7390                              <1> 
  7391                              <1> sysvideo_15_196_21:
  7392                              <1> 	; 8*16*8 = 1024 bytes (8192 pixels)
  7393 0000F63B 66C705[64030300]00- <1> 	mov	word [u.r0], 1024 ; font size = 1024 bytes
  7393 0000F643 04                  <1>
  7394 0000F644 E9A3E2FFFF          <1> 	jmp	sysret
  7395                              <1> 
  7396                              <1> sysvideo_15_196_22:
  7397 0000F649 80FF10              <1> 	cmp	bh, 16	; 16bpp ?
  7398 0000F64C 7754                <1> 	ja	short sysvideo_15_196_45 ; no
  7399                              <1> 
  7400 0000F64E 3C08                <1> 	cmp	al, 8	; 8 pixels per row ?
  7401 0000F650 7711                <1> 	ja	short sysvideo_15_196_27 ; no
  7402                              <1> 
  7403                              <1> 	; 8 pixels per row
  7404                              <1> ;sysvideo_15_196_23:
  7405                              <1> ;	lodsb
  7406                              <1> ;	push	edi
  7407                              <1> ;	mov	ah, 8
  7408                              <1> ;sysvideo_15_196_24:
  7409                              <1> ;	shr	al, 1
  7410                              <1> ;	jnc	short sysvideo_15_196_25
  7411                              <1> ;	mov	[edi], dx 
  7412                              <1> ;		; character pixel/forecolor,
  7413                              <1> ;		; 16 bpp (65536 colors)
  7414                              <1> ;sysvideo_15_196_25:	
  7415                              <1> ;	inc	edi
  7416                              <1> ;	inc	edi
  7417                              <1> ;	dec	ah
  7418                              <1> ;	jnz	short sysvideo_15_196_24 ; next pixel of (same) row	
  7419                              <1> ;	pop	edi
  7420                              <1> ;	add	edi, ebp ; next row (same column position)
  7421                              <1> ;	dec	cl
  7422                              <1> ;	jnz	short sysvideo_15_196_23
  7423                              <1> 				; next row of the character font
  7424 0000F652 E8A7020000          <1> 	call	sysvideo_15_196_23	
  7425                              <1> 
  7426                              <1> sysvideo_15_196_26:
  7427                              <1> 	; 1*16*1*2 = 32 bytes (128 pixels)
  7428 0000F657 C605[64030300]20    <1> 	mov	byte [u.r0], 32 ; font size = 32 bytes
  7429 0000F65E E989E2FFFF          <1> 	jmp	sysret
  7430                              <1> 
  7431                              <1> sysvideo_15_196_27:
  7432 0000F663 3C10                <1> 	cmp	al, 16
  7433 0000F665 7711                <1> 	ja	short sysvideo_15_196_33 ; >= 32 pixels per row
  7434                              <1> ;sysvideo_15_196_27_0:
  7435                              <1> ;	; 16 pixels per row
  7436                              <1> ;	; (4 bytes per row)
  7437                              <1> ;	mov	bx, dx
  7438                              <1> ;	shl	edx, 16 
  7439                              <1> ;	mov	dx, bx
  7440                              <1> ;sysvideo_15_196_28:
  7441                              <1> ;	mov	bl, 2  ; 2 rows with same pixels
  7442                              <1> ;sysvideo_15_196_29:	
  7443                              <1> ;	mov	al, [esi]	
  7444                              <1> ;	push	edi
  7445                              <1> ;	mov	ah, 8
  7446                              <1> ;sysvideo_15_196_30:
  7447                              <1> ;	shr	al, 1
  7448                              <1> ;	jnc	short sysvideo_15_196_31
  7449                              <1> ;	; 2 pixels with same forecolor
  7450                              <1> ;	mov	[edi], edx
  7451                              <1> ;		; character pixel/forecolor,
  7452                              <1> ;		; 16 bpp (65536 colors)
  7453                              <1> ;sysvideo_15_196_31:	
  7454                              <1> ;	add	edi, 4
  7455                              <1> ;	dec	ah
  7456                              <1> ;	jnz	short sysvideo_15_196_30 ; next pixel of (same) row	
  7457                              <1> ;	pop	edi
  7458                              <1> ;	add	edi, ebp ; next row
  7459                              <1> ;	dec	bl
  7460                              <1> ;	jnz	short sysvideo_15_196_29 ; same pixels for next row
  7461                              <1> ;	inc	esi
  7462                              <1> ;	dec	cl
  7463                              <1> ;	jnz	short sysvideo_15_196_28 ; next row of the character font
  7464 0000F667 E8AB020000          <1> 	call	sysvideo_15_196_27_0
  7465                              <1> 	
  7466                              <1> sysvideo_15_196_32:
  7467                              <1> 	; 2*16*2*2 = 128 bytes (512 pixels)
  7468 0000F66C C605[64030300]80    <1> 	mov	byte [u.r0], 128 ; font size = 128 bytes
  7469 0000F673 E974E2FFFF          <1> 	jmp	sysret
  7470                              <1> 
  7471                              <1> sysvideo_15_196_33:
  7472 0000F678 3C20                <1> 	cmp	al, 32
  7473 0000F67A 7713                <1> 	ja	short sysvideo_15_196_39 ; 64 pixels per row
  7474                              <1> ;sysvideo_15_196_33_0:
  7475                              <1> ;	; 32 pixels per row
  7476                              <1> ;	; (8 bytes per row)
  7477                              <1> ;	mov	bx, dx
  7478                              <1> ;	shl	edx, 16 
  7479                              <1> ;	mov	dx, bx
  7480                              <1> ;sysvideo_15_196_34:
  7481                              <1> ;	mov	bl, 4	; 4 rows with same pixels
  7482                              <1> ;sysvideo_15_196_35:	
  7483                              <1> ;	mov	al, [esi]	
  7484                              <1> ;	push	edi
  7485                              <1> ;	mov	ah, 8
  7486                              <1> ;sysvideo_15_196_36:
  7487                              <1> ;	shr	al, 1
  7488                              <1> ;	jnc	short sysvideo_15_196_37
  7489                              <1> ;	; 4 pixels with same forecolor
  7490                              <1> ;	mov	[edi], edx 
  7491                              <1> ;		; character pixel/forecolor,
  7492                              <1> ;		; 16 bpp (65536 colors)
  7493                              <1> ;	mov	[edi+4], edx 
  7494                              <1> ;		; character pixel/forecolor,
  7495                              <1> ;		; 16 bpp (65536 colors)
  7496                              <1> ;sysvideo_15_196_37:	
  7497                              <1> ;	add	edi, 8
  7498                              <1> ;	dec	ah
  7499                              <1> ;	jnz	short sysvideo_15_196_36 ; next pixel of (same) row	
  7500                              <1> ;	pop	edi
  7501                              <1> ;	add	edi, ebp ; next row
  7502                              <1> ;	dec	bl
  7503                              <1> ;	jnz	short sysvideo_15_196_35 ; same pixels for next row
  7504                              <1> ;	inc	esi
  7505                              <1> ;	dec	cl
  7506                              <1> ;	jnz	short sysvideo_15_196_34 ; next row of the character font
  7507 0000F67C E8C0020000          <1> 	call	sysvideo_15_196_33_0
  7508                              <1> 
  7509                              <1> sysvideo_15_196_38:
  7510                              <1> 	; 4*16*4*2 = 512 bytes (2048 pixels)
  7511 0000F681 66C705[64030300]00- <1> 	mov	word [u.r0], 512 ; font size = 512 bytes
  7511 0000F689 02                  <1>
  7512 0000F68A E95DE2FFFF          <1> 	jmp	sysret
  7513                              <1> 
  7514                              <1> sysvideo_15_196_39:
  7515                              <1> ;	; 64 pixels per row
  7516                              <1> ;	; (16 bytes per row)
  7517                              <1> ;	mov	bx, dx
  7518                              <1> ;	shl	edx, 16 
  7519                              <1> ;	mov	dx, bx
  7520                              <1> ;sysvideo_15_196_40:
  7521                              <1> ;	mov	bl, 8	; 8 rows with same pixels
  7522                              <1> ;sysvideo_15_196_41:	
  7523                              <1> ;	mov	al, [esi]	
  7524                              <1> ;	push	edi
  7525                              <1> ;	mov	ah, 8
  7526                              <1> ;sysvideo_15_196_42:
  7527                              <1> ;	shr	al, 1
  7528                              <1> ;	jnc	short sysvideo_15_196_43
  7529                              <1> ;	; 8 pixels with same forecolor
  7530                              <1> ;	mov	[edi], edx 
  7531                              <1> ;	mov	[edi+4], edx 
  7532                              <1> ;	mov	[edi+8], edx 
  7533                              <1> ;	mov	[edi+12], edx 
  7534                              <1> ;		; character pixel/forecolor,
  7535                              <1> ;		; 16 bpp (65536 colors)
  7536                              <1> ;sysvideo_15_196_43:	
  7537                              <1> ;	add	edi, 16
  7538                              <1> ;	dec	ah
  7539                              <1> ;	jnz	short sysvideo_15_196_42 ; next pixel of (same) row	
  7540                              <1> ;	pop	edi
  7541                              <1> ;	add	edi, ebp ; next row
  7542                              <1> ;	dec	bl
  7543                              <1> ;	jnz	short sysvideo_15_196_41 ; same pixels for next row
  7544                              <1> ;	inc	esi
  7545                              <1> ;	dec	cl
  7546                              <1> ;	jnz	short sysvideo_15_196_40 ; next row of the character font
  7547 0000F68F E8DA020000          <1> 	call	sysvideo_15_196_39_0
  7548                              <1> 
  7549                              <1> sysvideo_15_196_44:
  7550                              <1> 	; 8*16*8*2 = 2048 bytes (8192 pixels)
  7551 0000F694 66C705[64030300]00- <1> 	mov	word [u.r0], 2048 ; font size = 2048 bytes
  7551 0000F69C 08                  <1>
  7552 0000F69D E94AE2FFFF          <1> 	jmp	sysret
  7553                              <1> 
  7554                              <1> sysvideo_15_196_45:
  7555 0000F6A2 80FF20              <1> 	cmp	bh, 32	; 16bpp ?
  7556 0000F6A5 723D                <1> 	jb	short sysvideo_15_196_68 ; no
  7557                              <1> 
  7558 0000F6A7 3C08                <1> 	cmp	al, 8	; 8 pixels per row ?
  7559 0000F6A9 770A                <1> 	ja	short sysvideo_15_196_50 ; no
  7560                              <1> 	; 8 pixels per row
  7561                              <1> ;sysvideo_15_196_46:
  7562                              <1> ;	lodsb
  7563                              <1> ;	push	edi
  7564                              <1> ;	mov	ah, 8
  7565                              <1> ;sysvideo_15_196_47:
  7566                              <1> ;	shr	al, 1
  7567                              <1> ;	jnc	short sysvideo_15_196_48
  7568                              <1> ;	mov	[edi], edx 
  7569                              <1> ;		; character pixel/forecolor,
  7570                              <1> ;		; 32 bpp (true colors)
  7571                              <1> ;sysvideo_15_196_48:	
  7572                              <1> ;	add	edi, 4
  7573                              <1> ;	dec	ah
  7574                              <1> ;	jnz	short sysvideo_15_196_47 ; next pixel of (same) row	
  7575                              <1> ;	pop	edi
  7576                              <1> ;	add	edi, ebp ; next row (same column position)
  7577                              <1> ;	dec	cl
  7578                              <1> ;	jnz	short sysvideo_15_196_46
  7579                              <1> ;				; next row of the character font
  7580 0000F6AB E8F1020000          <1> 	call	sysvideo_15_196_46
  7581                              <1> 
  7582                              <1> sysvideo_15_196_49:
  7583                              <1> 	; 1*16*1*4 = 64 bytes (128 pixels)
  7584                              <1> 	;mov	byte [u.r0], 64 ; font size = 64 bytes
  7585                              <1> 	;jmp	sysret
  7586                              <1> 	; 03/01/2021
  7587 0000F6B0 E95EFFFFFF          <1> 	jmp	sysvideo_15_196_9
  7588                              <1> 
  7589                              <1> sysvideo_15_196_50:
  7590 0000F6B5 3C10                <1> 	cmp	al, 16
  7591 0000F6B7 770A                <1> 	ja	short sysvideo_15_196_56 ; >= 32 pixels per row
  7592                              <1> ;sysvideo_15_196_50_0:
  7593                              <1> ;	; 16 pixels per row
  7594                              <1> ;	; (8 bytes per row)
  7595                              <1> ;sysvideo_15_196_51:
  7596                              <1> ;	mov	bl, 2  ; 2 rows with same pixels
  7597                              <1> ;sysvideo_15_196_52:	
  7598                              <1> ;	mov	al, [esi]	
  7599                              <1> ;	push	edi
  7600                              <1> ;	mov	ah, 8
  7601                              <1> ;sysvideo_15_196_53:
  7602                              <1> ;	shr	al, 1
  7603                              <1> ;	jnc	short sysvideo_15_196_54
  7604                              <1> ;	; 2 pixels with same forecolor
  7605                              <1> ;	mov	[edi], edx
  7606                              <1> ;	mov	[edi+4], edx
  7607                              <1> ;		; character pixel/forecolor,
  7608                              <1> ;		; 32 bpp (true colors)
  7609                              <1> ;sysvideo_15_196_54:	
  7610                              <1> ;	add	edi, 8
  7611                              <1> ;	dec	ah
  7612                              <1> ;	jnz	short sysvideo_15_196_53 ; next pixel of (same) row	
  7613                              <1> ;	pop	edi
  7614                              <1> ;	add	edi, ebp ; next row
  7615                              <1> ;	dec	bl
  7616                              <1> ;	jnz	short sysvideo_15_196_52 ; same pixels for next row
  7617                              <1> ;	inc	esi
  7618                              <1> ;	dec	cl
  7619                              <1> ;	jnz	short sysvideo_15_196_51 ; next row of the character font
  7620 0000F6B9 E8FC020000          <1> 	call	sysvideo_15_196_50_0
  7621                              <1> 
  7622                              <1> sysvideo_15_196_55:
  7623                              <1> 	; 2*16*2*4 = 256 bytes (512 pixels)
  7624                              <1> 	;mov	word [u.r0], 256 ; font size = 256 bytes
  7625                              <1> 	;jmp	sysret
  7626                              <1> 	; 03/01/2021
  7627 0000F6BE E965FFFFFF          <1> 	jmp	sysvideo_15_196_15
  7628                              <1> 
  7629                              <1> sysvideo_15_196_56:
  7630 0000F6C3 3C20                <1> 	cmp	al, 32
  7631 0000F6C5 770A                <1> 	ja	short sysvideo_15_196_62 ; 64 pixels per row
  7632                              <1> ;sysvideo_15_196_56_0:
  7633                              <1> ;	; 32 pixels per row
  7634                              <1> ;	; (16 bytes per row)
  7635                              <1> ;sysvideo_15_196_57:
  7636                              <1> ;	mov	bl, 4	; 4 rows with same pixels
  7637                              <1> ;sysvideo_15_196_58:	
  7638                              <1> ;	mov	al, [esi]	
  7639                              <1> ;	push	edi
  7640                              <1> ;	mov	ah, 8
  7641                              <1> ;sysvideo_15_196_59:
  7642                              <1> ;	shr	al, 1
  7643                              <1> ;	jnc	short sysvideo_15_196_60
  7644                              <1> ;	; 4 pixels with same forecolor
  7645                              <1> ;	mov	[edi], edx 
  7646                              <1> ;	mov	[edi+4], edx 
  7647                              <1> ;	mov	[edi+8], edx 
  7648                              <1> ;	mov	[edi+12], edx 
  7649                              <1> ;		; character pixel/forecolor,
  7650                              <1> ;		; 32 bpp (true colors)
  7651                              <1> ;sysvideo_15_196_60:	
  7652                              <1> ;	add	edi, 16
  7653                              <1> ;	dec	ah
  7654                              <1> ;	jnz	short sysvideo_15_196_59 ; next pixel of (same) row	
  7655                              <1> ;	pop	edi
  7656                              <1> ;	add	edi, ebp ; next row
  7657                              <1> ;	dec	bl
  7658                              <1> ;	jnz	short sysvideo_15_196_58 ; same pixels for next row
  7659                              <1> ;	inc	esi
  7660                              <1> ;	dec	cl
  7661                              <1> ;	jnz	short sysvideo_15_196_57 ; next row of the character font
  7662 0000F6C7 E812030000          <1> 	call	sysvideo_15_196_56_0
  7663                              <1> 
  7664                              <1> sysvideo_15_196_61:
  7665                              <1> 	; 4*16*4*4 = 1024 bytes (2048 pixels)
  7666                              <1> 	;mov	word [u.r0], 1024 ; font size = 1024 bytes
  7667                              <1> 	;jmp	sysret
  7668                              <1> 	; 03/01/2021
  7669 0000F6CC E96AFFFFFF          <1> 	jmp	sysvideo_15_196_21
  7670                              <1> 
  7671                              <1> sysvideo_15_196_62:
  7672                              <1> ;	; 64 pixels per row
  7673                              <1> ;	; (16 bytes per row)
  7674                              <1> ;	mov	bx, dx
  7675                              <1> ;	shl	edx, 16 
  7676                              <1> ;	mov	dx, bx
  7677                              <1> ;sysvideo_15_196_63:
  7678                              <1> ;	mov	bl, 8	; 8 rows with same pixels
  7679                              <1> ;sysvideo_15_196_64:	
  7680                              <1> ;	mov	al, [esi]	
  7681                              <1> ;	push	edi
  7682                              <1> ;	mov	ah, 8
  7683                              <1> ;sysvideo_15_196_65:
  7684                              <1> ;	shr	al, 1
  7685                              <1> ;	jnc	short sysvideo_15_196_66
  7686                              <1> ;	; 8 pixels with same forecolor
  7687                              <1> ;	mov	[edi], edx 
  7688                              <1> ;	mov	[edi+4], edx 
  7689                              <1> ;	mov	[edi+8], edx 
  7690                              <1> ;	mov	[edi+12], edx 
  7691                              <1> ;	mov	[edi+16], edx 
  7692                              <1> ;	mov	[edi+20], edx 
  7693                              <1> ;	mov	[edi+24], edx 
  7694                              <1> ;	mov	[edi+28], edx 
  7695                              <1> ;		; character pixel/forecolor,
  7696                              <1> ;		; 32 bpp (true colors)
  7697                              <1> ;sysvideo_15_196_66:	
  7698                              <1> ;	add	edi, 32
  7699                              <1> ;	dec	ah
  7700                              <1> ;	jnz	short sysvideo_15_196_65 ; next pixel of (same) row	
  7701                              <1> ;	pop	edi
  7702                              <1> ;	add	edi, ebp ; next row
  7703                              <1> ;	dec	bl
  7704                              <1> ;	jnz	short sysvideo_15_196_64 ; same pixels for next row
  7705                              <1> ;	inc	esi
  7706                              <1> ;	dec	cl
  7707                              <1> ;	jnz	short sysvideo_15_196_63 ; next row of the character font
  7708 0000F6D1 E832030000          <1> 	call	sysvideo_15_196_62_0
  7709                              <1> 
  7710                              <1> sysvideo_15_196_67:
  7711                              <1> 	; 8*16*8*4 = 4096 bytes (8192 pixels)
  7712 0000F6D6 66C705[64030300]00- <1> 	mov	word [u.r0], 4096 ; font size = 4096 bytes
  7712 0000F6DE 10                  <1>
  7713 0000F6DF E908E2FFFF          <1> 	jmp	sysret
  7714                              <1> 
  7715                              <1> sysvideo_15_196_68:
  7716                              <1> 	; bh = 24
  7717                              <1> 	; 24 bpp
  7718 0000F6E4 3C08                <1> 	cmp	al, 8	; 8 pixels per row ?
  7719 0000F6E6 7711                <1> 	ja	short sysvideo_15_196_73 ; no
  7720                              <1> 	; 8 pixels per row
  7721                              <1> ;sysvideo_15_196_69:
  7722                              <1> ;	lodsb
  7723                              <1> ;	push	edi
  7724                              <1> ;	mov	ah, 8
  7725                              <1> ;sysvideo_15_196_70:
  7726                              <1> ;	shr	al, 1
  7727                              <1> ;	jnc	short sysvideo_15_196_71
  7728                              <1> ;	;mov	ebx, edx
  7729                              <1> ;	;shr	ebx, 16
  7730                              <1> ;	;mov	[edi], dx
  7731                              <1> ;	;mov	[edi+2], bl
  7732                              <1> ;	call	sysvideo_15_196_91
  7733                              <1> ;		; character pixel/forecolor,
  7734                              <1> ;		; 24 bpp (true colors)
  7735                              <1> ;sysvideo_15_196_71:	
  7736                              <1> ;	add	edi, 3
  7737                              <1> ;	dec	ah
  7738                              <1> ;	jnz	short sysvideo_15_196_70 ; next pixel of (same) row	
  7739                              <1> ;	pop	edi
  7740                              <1> ;	add	edi, ebp ; next row (same column position)
  7741                              <1> ;	dec	cl
  7742                              <1> ;	jnz	short sysvideo_15_196_69
  7743                              <1> ;				; next row of the character font
  7744 0000F6E8 E85A030000          <1> 	call	sysvideo_15_196_69	
  7745                              <1> 
  7746                              <1> sysvideo_15_196_72:
  7747                              <1> 	; 1*16*1*3 = 48 bytes (128 pixels)
  7748 0000F6ED C605[64030300]30    <1> 	mov	byte [u.r0], 48 ; font size = 48 bytes
  7749 0000F6F4 E9F3E1FFFF          <1> 	jmp	sysret
  7750                              <1> 
  7751                              <1> sysvideo_15_196_73:
  7752 0000F6F9 3C10                <1> 	cmp	al, 16
  7753 0000F6FB 7711                <1> 	ja	short sysvideo_15_196_79 ; >= 32 pixels per row
  7754                              <1> 	; 16 pixels per row
  7755                              <1> 	; (6 bytes per row)
  7756                              <1> ;sysvideo_15_196_74:
  7757                              <1> ;	mov	bl, 2  ; 2 rows with same pixels
  7758                              <1> ;sysvideo_15_196_75:	
  7759                              <1> ;	mov	al, [esi]	
  7760                              <1> ;	push	edi
  7761                              <1> ;	mov	ah, 8
  7762                              <1> ;sysvideo_15_196_76:
  7763                              <1> ;	shr	al, 1
  7764                              <1> ;	jnc	short sysvideo_15_196_77
  7765                              <1> ;	; 2 pixels with same forecolor
  7766                              <1> ;	;mov	ebx, edx
  7767                              <1> ;	;shr	ebx, 16
  7768                              <1> ;	;mov	[edi], dx
  7769                              <1> ;	;mov	[edi+2], bl
  7770                              <1> ;	call	sysvideo_15_196_91
  7771                              <1> ;	;mov	[edi+3], dx
  7772                              <1> ;	;mov	[edi+5], bl
  7773                              <1> ;	call	sysvideo_15_196_92	  
  7774                              <1> ;		; character pixel/forecolor,
  7775                              <1> ;		; 24 bpp (true colors)
  7776                              <1> ;sysvideo_15_196_77:	
  7777                              <1> ;	add	edi, 6
  7778                              <1> ;	dec	ah
  7779                              <1> ;	jnz	short sysvideo_15_196_76 ; next pixel of (same) row	
  7780                              <1> ;	pop	edi
  7781                              <1> ;	add	edi, ebp ; next row
  7782                              <1> ;	dec	bl
  7783                              <1> ;	jnz	short sysvideo_15_196_75 ; same pixels for next row
  7784                              <1> ;	inc	esi
  7785                              <1> ;	dec	cl
  7786                              <1> ;	jnz	short sysvideo_15_196_74 ; next row of the character font
  7787 0000F6FD E861030000          <1> 	call	sysvideo_15_196_74
  7788                              <1> 
  7789                              <1> sysvideo_15_196_78:
  7790                              <1> 	; 2*16*2*3 = 192 bytes (512 pixels)
  7791 0000F702 C605[64030300]C0    <1> 	mov	byte [u.r0], 192 ; font size = 192 bytes
  7792 0000F709 E9DEE1FFFF          <1> 	jmp	sysret
  7793                              <1> 
  7794                              <1> sysvideo_15_196_79:
  7795 0000F70E 3C20                <1> 	cmp	al, 32
  7796 0000F710 7713                <1> 	ja	short sysvideo_15_196_85 ; 64 pixels per row
  7797                              <1> 	; 32 pixels per row
  7798                              <1> 	; (12 bytes per row)
  7799                              <1> ;sysvideo_15_196_80:
  7800                              <1> ;	mov	bl, 4	; 4 rows with same pixels
  7801                              <1> ;sysvideo_15_196_81:	
  7802                              <1> ;	mov	al, [esi]	
  7803                              <1> ;	push	edi
  7804                              <1> ;	mov	ah, 8
  7805                              <1> ;sysvideo_15_196_82:
  7806                              <1> ;	shr	al, 1
  7807                              <1> ;	jnc	short sysvideo_15_196_83
  7808                              <1> ;	; 4 pixels with same forecolor
  7809                              <1> ;	;mov	ebx, edx
  7810                              <1> ;	;shr	ebx, 16
  7811                              <1> ;	;mov	[edi], dx
  7812                              <1> ;	;mov	[edi+2], bl
  7813                              <1> ;	call	sysvideo_15_196_91
  7814                              <1> ;	;mov	[edi+3], dx
  7815                              <1> ;	;mov	[edi+5], bl
  7816                              <1> ;	;mov	[edi+6], dx
  7817                              <1> ;	;mov	[edi+8], bl
  7818                              <1> ;	;mov	[edi+9], dx
  7819                              <1> ;	;mov	[edi+11], bl
  7820                              <1> ;	call	sysvideo_15_196_93	 
  7821                              <1> ;		; character pixel/forecolor,
  7822                              <1> ;		; 24 bpp (true colors)
  7823                              <1> ;sysvideo_15_196_83:	
  7824                              <1> ;	add	edi, 12
  7825                              <1> ;	dec	ah
  7826                              <1> ;	jnz	short sysvideo_15_196_82 ; next pixel of (same) row	
  7827                              <1> ;	pop	edi
  7828                              <1> ;	add	edi, ebp ; next row
  7829                              <1> ;	dec	bl
  7830                              <1> ;	jnz	short sysvideo_15_196_81 ; same pixels for next row
  7831                              <1> ;	inc	esi
  7832                              <1> ;	dec	cl
  7833                              <1> ;	jnz	short sysvideo_15_196_80 ; next row of the character font
  7834 0000F712 E875030000          <1> 	call	sysvideo_15_196_80
  7835                              <1> 
  7836                              <1> sysvideo_15_196_84:
  7837                              <1> 	; 4*16*4*3 = 768 bytes (2048 pixels)
  7838 0000F717 66C705[64030300]00- <1> 	mov	word [u.r0], 768 ; font size = 768 bytes
  7838 0000F71F 03                  <1>
  7839 0000F720 E9C7E1FFFF          <1> 	jmp	sysret
  7840                              <1> 
  7841                              <1> sysvideo_15_196_85:
  7842                              <1> ;	; 64 pixels per row
  7843                              <1> ;	; (24 bytes per row)
  7844                              <1> ;	mov	bx, dx
  7845                              <1> ;	shl	edx, 16 
  7846                              <1> ;	mov	dx, bx
  7847                              <1> ;sysvideo_15_196_86:
  7848                              <1> ;	mov	bl, 8	; 8 rows with same pixels
  7849                              <1> ;sysvideo_15_196_87:	
  7850                              <1> ;	mov	al, [esi]	
  7851                              <1> ;	push	edi
  7852                              <1> ;	mov	ah, 8
  7853                              <1> ;sysvideo_15_196_88:
  7854                              <1> ;	shr	al, 1
  7855                              <1> ;	jnc	short sysvideo_15_196_89
  7856                              <1> ;	; 8 pixels with same forecolor
  7857                              <1> ;	;mov	ebx, edx
  7858                              <1> ;	;shr	ebx, 16
  7859                              <1> ;	;mov	[edi], dx
  7860                              <1> ;	;mov	[edi+2], bl
  7861                              <1> ;	call	sysvideo_15_196_91
  7862                              <1> ;	;mov	[edi+3], dx
  7863                              <1> ;	;mov	[edi+5], bl
  7864                              <1> ;	;mov	[edi+6], dx
  7865                              <1> ;	;mov	[edi+8], bl
  7866                              <1> ;	;mov	[edi+9], dx
  7867                              <1> ;	;mov	[edi+11], bl
  7868                              <1> ;	;mov	[edi+12], dx
  7869                              <1> ;	;mov	[edi+14], bl
  7870                              <1> ;	;mov	[edi+15], dx
  7871                              <1> ;	;mov	[edi+17], bl
  7872                              <1> ;	;mov	[edi+18], dx
  7873                              <1> ;	;mov	[edi+20], bl
  7874                              <1> ;	;mov	[edi+21], dx
  7875                              <1> ;	;mov	[edi+23], bl
  7876                              <1> ;	call	sysvideo_15_196_94
  7877                              <1> ;		; character pixel/forecolor,
  7878                              <1> ;		; 24 bpp (true colors)
  7879                              <1> ;sysvideo_15_196_89:	
  7880                              <1> ;	add	edi, 24
  7881                              <1> ;	dec	ah
  7882                              <1> ;	jnz	short sysvideo_15_196_88 ; next pixel of (same) row	
  7883                              <1> ;	pop	edi
  7884                              <1> ;	add	edi, ebp ; next row
  7885                              <1> ;	dec	bl
  7886                              <1> ;	jnz	short sysvideo_15_196_87 ; same pixels for next row
  7887                              <1> ;	inc	esi
  7888                              <1> ;	dec	cl
  7889                              <1> ;	jnz	short sysvideo_15_196_86 ; next row of the character font
  7890 0000F725 E88B030000          <1> 	call	sysvideo_15_196_85_0
  7891                              <1> 
  7892                              <1> sysvideo_15_196_90:
  7893                              <1> 	; 8*16*8*3 = 3072 bytes (8192 pixels)
  7894 0000F72A 66C705[64030300]00- <1> 	mov	word [u.r0], 3072 ; font size = 3072 bytes
  7894 0000F732 0C                  <1>
  7895 0000F733 E9B4E1FFFF          <1> 	jmp	sysret
  7896                              <1> 
  7897                              <1> sysvideo_15_197:
  7898                              <1> 	; 05/01/2021 ([ufont])
  7899                              <1> 
  7900                              <1> 	; ebp = screen width (converted to bytes)
  7901                              <1> 	; edi = character start position in LFB
  7902                              <1> 	;  bh = bytes per pixel (video mode)
  7903                              <1> 	;  al = font pixels per row
  7904                              <1> 
  7905                              <1> 	; esi = ASCII code of the character	
  7906                              <1> 
  7907                              <1> 	; 8x8 character font
  7908 0000F738 66C1E603            <1> 	shl	si, 3 ; * 8 (character font size)
  7909                              <1> 
  7910                              <1> 	; 05/01/2021
  7911                              <1> 		; test 8x8 user font is ready flag
  7912 0000F73C F605[82120300]01    <1> 	test	byte [ufont], 1
  7913 0000F743 7408                <1> 	jz	short sysvideo_15_197_1
  7914                              <1> 	; 8x8 user font available
  7915 0000F745 81C600500900        <1> 	add	esi, VGAFONT8USER
  7916 0000F74B EB06                <1> 	jmp	short sysvideo_15_197_2
  7917                              <1> sysvideo_15_197_1: 
  7918 0000F74D 81C6[24580100]      <1> 	add	esi, vgafont8
  7919                              <1> sysvideo_15_197_2: 
  7920 0000F753 8B15[7E120300]      <1> 	mov	edx, [maskcolor]
  7921                              <1> 
  7922 0000F759 B108                <1> 	mov	cl, 8	; 8 rows (8x8 font)
  7923                              <1> 
  7924 0000F75B 80FF08              <1> 	cmp	bh, 8	; 8bpp ?
  7925 0000F75E 773B                <1> 	ja	short sysvideo_15_197_22 ; no
  7926                              <1> 
  7927 0000F760 3C08                <1> 	cmp	al, 8	; 8 pixels per row ?
  7928 0000F762 7711                <1> 	ja	short sysvideo_15_197_4	; no
  7929                              <1> 
  7930                              <1> 	; 8 pixels per row
  7931                              <1> ;sysvideo_15_197_0:
  7932                              <1> ;	lodsb
  7933                              <1> ;	push	edi
  7934                              <1> ;	mov	ah, 8
  7935                              <1> ;sysvideo_15_197_1:
  7936                              <1> ;	shr	al, 1
  7937                              <1> ;	jnc	short sysvideo_15_197_2
  7938                              <1> ;	mov	[edi], dl 
  7939                              <1> ;		; character pixel/forecolor,
  7940                              <1> ;		; 8 bpp (256 colors)
  7941                              <1> ;sysvideo_15_197_2:	
  7942                              <1> ;	inc	edi
  7943                              <1> ;	dec	ah
  7944                              <1> ;	jnz	short sysvideo_15_197_1 ; next pixel of (same) row	
  7945                              <1> ;	pop	edi
  7946                              <1> ;	add	edi, ebp ; next row (same column position)
  7947                              <1> ;	dec	cl
  7948                              <1> ;	jnz	short sysvideo_15_197_0
  7949                              <1> ;				; next row of the character font
  7950 0000F764 E808010000          <1> 	call	sysvideo_15_197_0
  7951                              <1> 
  7952                              <1> sysvideo_15_197_3:
  7953                              <1> 	; 1*8*1 = 8 bytes (64 pixels)
  7954 0000F769 C605[64030300]08    <1> 	mov	byte [u.r0], 8 ; font size = 8 bytes
  7955 0000F770 E977E1FFFF          <1> 	jmp	sysret
  7956                              <1> 
  7957                              <1> sysvideo_15_197_4:
  7958 0000F775 3C10                <1> 	cmp	al, 16
  7959 0000F777 770A                <1> 	ja	short sysvideo_15_197_10 ; >= 32 pixels per row
  7960                              <1> 	; 16 pixels per row
  7961                              <1> ;sysvideo_15_197_4_0:
  7962                              <1> ;	mov	dh, dl
  7963                              <1> ;sysvideo_15_197_5:
  7964                              <1> ;	mov	bl, 2  ; 2 rows with same pixels
  7965                              <1> ;sysvideo_15_197_6:	
  7966                              <1> ;	mov	al, [esi]	
  7967                              <1> ;	push	edi
  7968                              <1> ;	mov	ah, 8
  7969                              <1> ;sysvideo_15_197_7:
  7970                              <1> ;	shr	al, 1
  7971                              <1> ;	jnc	short sysvideo_15_197_8
  7972                              <1> ;	; 2 pixels with same forecolor
  7973                              <1> ;	mov	[edi], dx
  7974                              <1> ;		; character pixel/forecolor,
  7975                              <1> ;		; 8 bpp (256 colors)
  7976                              <1> ;sysvideo_15_197_8:	
  7977                              <1> ;	inc	edi
  7978                              <1> ;	inc	edi
  7979                              <1> ;	dec	ah
  7980                              <1> ;	jnz	short sysvideo_15_197_7 ; next pixel of (same) row	
  7981                              <1> ;	pop	edi
  7982                              <1> ;	add	edi, ebp ; next row
  7983                              <1> ;	dec	bl
  7984                              <1> ;	jnz	short sysvideo_15_197_6 ; same pixels for next row
  7985                              <1> ;	inc	esi
  7986                              <1> ;	dec	cl
  7987                              <1> ;	jnz	short sysvideo_15_197_5 ; next row of the character font
  7988 0000F779 E80A010000          <1> 	call	sysvideo_15_197_4_0	
  7989                              <1> 
  7990                              <1> sysvideo_15_197_9:
  7991                              <1> 	; 2*8*2 = 32 bytes (256 pixels)
  7992                              <1> 	;mov	byte [u.r0], 32 ; font size = 32 bytes
  7993                              <1> 	;jmp	sysret
  7994                              <1> 	; 03/01/2021
  7995 0000F77E E9D4FEFFFF          <1> 	jmp	sysvideo_15_196_26
  7996                              <1> 
  7997                              <1> sysvideo_15_197_10:
  7998 0000F783 3C20                <1> 	cmp	al, 32
  7999 0000F785 770A                <1> 	ja	short sysvideo_15_197_16 ; 64 pixels per row
  8000                              <1> 	; 32 pixels per row
  8001                              <1> ;sysvideo_15_197_10_0:
  8002                              <1> ;	mov	dh, dl
  8003                              <1> ;	ror	edx, 8  ; byte 2 -> dh, dl -> byte 3
  8004                              <1> ;			; dh -> dl
  8005                              <1> ;	mov	dh, dl	; byte 1 -> dl 
  8006                              <1> ;sysvideo_15_197_11:
  8007                              <1> ;	mov	bl, 4	; 4 rows with same pixels
  8008                              <1> ;sysvideo_15_197_12:	
  8009                              <1> ;	mov	al, [esi]	
  8010                              <1> ;	push	edi
  8011                              <1> ;	mov	ah, 8
  8012                              <1> ;sysvideo_15_197_13:
  8013                              <1> ;	shr	al, 1
  8014                              <1> ;	jnc	short sysvideo_15_197_14
  8015                              <1> ;	; 4 pixels with same forecolor
  8016                              <1> ;	mov	[edi], edx 
  8017                              <1> ;		; character pixel/forecolor,
  8018                              <1> ;		; 8 bpp (256 colors)
  8019                              <1> ;sysvideo_15_197_14:	
  8020                              <1> ;	add	edi, 4
  8021                              <1> ;	dec	ah
  8022                              <1> ;	jnz	short sysvideo_15_197_13 ; next pixel of (same) row	
  8023                              <1> ;	pop	edi
  8024                              <1> ;	add	edi, ebp ; next row
  8025                              <1> ;	dec	bl
  8026                              <1> ;	jnz	short sysvideo_15_197_12 ; same pixels for next row
  8027                              <1> ;	inc	esi
  8028                              <1> ;	dec	cl
  8029                              <1> ;	jnz	short sysvideo_15_197_11 ; next row of the character font
  8030 0000F787 E81F010000          <1> 	call	sysvideo_15_197_10_0	
  8031                              <1> 
  8032                              <1> sysvideo_15_197_15:
  8033                              <1> 	; 4*8*4 = 128 bytes (1024 pixels)
  8034                              <1> 	;mov	byte [u.r0], 128 ; font size = 128 bytes
  8035                              <1> 	;jmp	sysret
  8036                              <1> 	; 03/01/2021
  8037 0000F78C E9DBFEFFFF          <1> 	jmp	sysvideo_15_196_32
  8038                              <1> 
  8039                              <1> sysvideo_15_197_16:
  8040                              <1> ;	; 64 pixels per row
  8041                              <1> ;	mov	dh, dl
  8042                              <1> ;	ror	edx, 8  ; byte 2 -> dh, dl -> byte 3
  8043                              <1> ;			; dh -> dl
  8044                              <1> ;	mov	dh, dl	; byte 1 -> dl 
  8045                              <1> ;sysvideo_15_197_17:
  8046                              <1> ;	mov	bl, 8	; 8 rows with same pixels
  8047                              <1> ;sysvideo_15_197_18:	
  8048                              <1> ;	mov	al, [esi]	
  8049                              <1> ;	push	edi
  8050                              <1> ;	mov	ah, 8
  8051                              <1> ;sysvideo_15_197_19:
  8052                              <1> ;	shr	al, 1
  8053                              <1> ;	jnc	short sysvideo_15_197_20
  8054                              <1> ;	; 8 pixels with same forecolor
  8055                              <1> ;	mov	[edi], edx 
  8056                              <1> ;		; character pixel/forecolor,
  8057                              <1> ;		; 8 bpp (256 colors)
  8058                              <1> ;	mov	[edi+4], edx 
  8059                              <1> ;		; character pixel/forecolor,
  8060                              <1> ;		; 8 bpp (256 colors)
  8061                              <1> ;sysvideo_15_197_20:	
  8062                              <1> ;	add	edi, 8
  8063                              <1> ;	dec	ah
  8064                              <1> ;	jnz	short sysvideo_15_197_19 ; next pixel of (same) row	
  8065                              <1> ;	pop	edi
  8066                              <1> ;	add	edi, ebp ; next row
  8067                              <1> ;	dec	bl
  8068                              <1> ;	jnz	short sysvideo_15_197_18 ; same pixels for next row
  8069                              <1> ;	inc	esi
  8070                              <1> ;	dec	cl
  8071                              <1> ;	jnz	short sysvideo_15_197_17 ; next row of the character font
  8072 0000F791 E83D010000          <1> 	call	sysvideo_15_197_16_0
  8073                              <1> 
  8074                              <1> sysvideo_15_197_21:
  8075                              <1> 	; 8*8*8 = 512 bytes (4096 pixels)
  8076                              <1> 	;mov	word [u.r0], 512 ; font size = 512 bytes
  8077                              <1> 	;jmp	sysret
  8078                              <1> 	; 03/01/2021
  8079 0000F796 E9E6FEFFFF          <1> 	jmp	sysvideo_15_196_38
  8080                              <1> 
  8081                              <1> sysvideo_15_197_22:
  8082 0000F79B 80FF10              <1> 	cmp	bh, 16	; 16bpp ?
  8083 0000F79E 7734                <1> 	ja	short sysvideo_15_197_45 ; no
  8084                              <1> 
  8085 0000F7A0 3C08                <1> 	cmp	al, 8	; 8 pixels per row ?
  8086 0000F7A2 770A                <1> 	ja	short sysvideo_15_197_27 ; no
  8087                              <1> 	; 8 pixels per row
  8088                              <1> ;sysvideo_15_197_23:
  8089                              <1> ;	lodsb
  8090                              <1> ;	push	edi
  8091                              <1> ;	mov	ah, 8
  8092                              <1> ;sysvideo_15_197_24:
  8093                              <1> ;	shr	al, 1
  8094                              <1> ;	jnc	short sysvideo_15_197_25
  8095                              <1> ;	mov	[edi], dx 
  8096                              <1> ;		; character pixel/forecolor,
  8097                              <1> ;		; 16 bpp (65536 colors)
  8098                              <1> ;sysvideo_15_197_25:	
  8099                              <1> ;	inc	edi
  8100                              <1> ;	inc	edi
  8101                              <1> ;	dec	ah
  8102                              <1> ;	jnz	short sysvideo_15_197_24 ; next pixel of (same) row	
  8103                              <1> ;	pop	edi
  8104                              <1> ;	add	edi, ebp ; next row (same column position)
  8105                              <1> ;	dec	cl
  8106                              <1> ;	jnz	short sysvideo_15_197_23
  8107                              <1> ;				; next row of the character font
  8108 0000F7A4 E855010000          <1> 	call	sysvideo_15_197_23	
  8109                              <1> 
  8110                              <1> sysvideo_15_197_26:
  8111                              <1> 	; 1*8*1*2 = 16 bytes (64 pixels)
  8112                              <1> 	;mov	byte [u.r0], 16 ; font size = 16 bytes
  8113                              <1> 	;jmp	sysret
  8114                              <1> 	; 03/01/2021
  8115 0000F7A9 E950FEFFFF          <1> 	jmp	sysvideo_15_196_3
  8116                              <1> 
  8117                              <1> sysvideo_15_197_27:
  8118 0000F7AE 3C10                <1> 	cmp	al, 16
  8119 0000F7B0 770A                <1> 	ja	short sysvideo_15_197_33 ; >= 32 pixels per row
  8120                              <1> ;sysvideo_15_197_27_0:
  8121                              <1> ;	; 16 pixels per row
  8122                              <1> ;	; (4 bytes per row)
  8123                              <1> ;	mov	bx, dx
  8124                              <1> ;	shl	edx, 16 
  8125                              <1> ;	mov	dx, bx
  8126                              <1> ;sysvideo_15_197_28:
  8127                              <1> ;	mov	bl, 2  ; 2 rows with same pixels
  8128                              <1> ;sysvideo_15_197_29:	
  8129                              <1> ;	mov	al, [esi]	
  8130                              <1> ;	push	edi
  8131                              <1> ;	mov	ah, 8
  8132                              <1> ;sysvideo_15_197_30:
  8133                              <1> ;	shr	al, 1
  8134                              <1> ;	jnc	short sysvideo_15_197_31
  8135                              <1> ;	; 2 pixels with same forecolor
  8136                              <1> ;	mov	[edi], edx
  8137                              <1> ;		; character pixel/forecolor,
  8138                              <1> ;		; 16 bpp (65536 colors)
  8139                              <1> ;sysvideo_15_197_31:	
  8140                              <1> ;	add	edi, 4
  8141                              <1> ;	dec	ah
  8142                              <1> ;	jnz	short sysvideo_15_197_30 ; next pixel of (same) row	
  8143                              <1> ;	pop	edi
  8144                              <1> ;	add	edi, ebp ; next row
  8145                              <1> ;	dec	bl
  8146                              <1> ;	jnz	short sysvideo_15_197_29 ; same pixels for next row
  8147                              <1> ;	inc	esi
  8148                              <1> ;	dec	cl
  8149                              <1> ;	jnz	short sysvideo_15_197_28 ; next row of the character font
  8150 0000F7B2 E860010000          <1> 	call	sysvideo_15_197_27_0
  8151                              <1> 
  8152                              <1> sysvideo_15_197_32:
  8153                              <1> 	; 2*8*2*2 = 64 bytes (256 pixels)
  8154                              <1> 	;mov	byte [u.r0], 64 ; font size = 64 bytes
  8155                              <1> 	;jmp	sysret
  8156                              <1> 	; 03/01/2021
  8157 0000F7B7 E957FEFFFF          <1> 	jmp	sysvideo_15_196_9
  8158                              <1> 
  8159                              <1> sysvideo_15_197_33:
  8160 0000F7BC 3C20                <1> 	cmp	al, 32
  8161 0000F7BE 770A                <1> 	ja	short sysvideo_15_197_39 ; 64 pixels per row
  8162                              <1> ;sysvideo_15_197_33_0:
  8163                              <1> ;	; 32 pixels per row
  8164                              <1> ;	; (8 bytes per row)
  8165                              <1> ;	mov	bx, dx
  8166                              <1> ;	shl	edx, 16 
  8167                              <1> ;	mov	dx, bx
  8168                              <1> ;sysvideo_15_197_34:
  8169                              <1> ;	mov	bl, 4	; 4 rows with same pixels
  8170                              <1> ;sysvideo_15_197_35:	
  8171                              <1> ;	mov	al, [esi]	
  8172                              <1> ;	push	edi
  8173                              <1> ;	mov	ah, 8
  8174                              <1> ;sysvideo_15_197_36:
  8175                              <1> ;	shr	al, 1
  8176                              <1> ;	jnc	short sysvideo_15_197_37
  8177                              <1> ;	; 4 pixels with same forecolor
  8178                              <1> ;	mov	[edi], edx 
  8179                              <1> ;		; character pixel/forecolor,
  8180                              <1> ;		; 16 bpp (65536 colors)
  8181                              <1> ;	mov	[edi+4], edx 
  8182                              <1> ;		; character pixel/forecolor,
  8183                              <1> ;		; 16 bpp (65536 colors)
  8184                              <1> ;sysvideo_15_197_37:	
  8185                              <1> ;	add	edi, 8
  8186                              <1> ;	dec	ah
  8187                              <1> ;	jnz	short sysvideo_15_197_36 ; next pixel of (same) row	
  8188                              <1> ;	pop	edi
  8189                              <1> ;	add	edi, ebp ; next row
  8190                              <1> ;	dec	bl
  8191                              <1> ;	jnz	short sysvideo_15_197_35 ; same pixels for next row
  8192                              <1> ;	inc	esi
  8193                              <1> ;	dec	cl
  8194                              <1> ;	jnz	short sysvideo_15_197_34 ; next row of the character font
  8195 0000F7C0 E87C010000          <1> 	call	sysvideo_15_197_33_0
  8196                              <1> 
  8197                              <1> sysvideo_15_197_38:
  8198                              <1> 	; 4*8*4*2 = 256 bytes (1024 pixels)
  8199                              <1> 	;mov	word [u.r0], 256 ; font size = 256 bytes
  8200                              <1> 	;jmp	sysret
  8201                              <1> 	; 03/01/2021
  8202 0000F7C5 E95EFEFFFF          <1> 	jmp	sysvideo_15_196_15
  8203                              <1> 
  8204                              <1> sysvideo_15_197_39:
  8205                              <1> ;	; 64 pixels per row
  8206                              <1> ;	; (16 bytes per row)
  8207                              <1> ;	mov	bx, dx
  8208                              <1> ;	shl	edx, 16 
  8209                              <1> ;	mov	dx, bx
  8210                              <1> ;sysvideo_15_197_40:
  8211                              <1> ;	mov	bl, 8	; 8 rows with same pixels
  8212                              <1> ;sysvideo_15_197_41:	
  8213                              <1> ;	mov	al, [esi]	
  8214                              <1> ;	push	edi
  8215                              <1> ;	mov	ah, 8
  8216                              <1> ;sysvideo_15_197_42:
  8217                              <1> ;	shr	al, 1
  8218                              <1> ;	jnc	short sysvideo_15_197_43
  8219                              <1> ;	; 8 pixels with same forecolor
  8220                              <1> ;	mov	[edi], edx 
  8221                              <1> ;	mov	[edi+4], edx 
  8222                              <1> ;	mov	[edi+8], edx 
  8223                              <1> ;	mov	[edi+12], edx 
  8224                              <1> ;		; character pixel/forecolor,
  8225                              <1> ;		; 16 bpp (65536 colors)
  8226                              <1> ;sysvideo_15_197_43:	
  8227                              <1> ;	add	edi, 16
  8228                              <1> ;	dec	ah
  8229                              <1> ;	jnz	short sysvideo_15_197_42 ; next pixel of (same) row	
  8230                              <1> ;	pop	edi
  8231                              <1> ;	add	edi, ebp ; next row
  8232                              <1> ;	dec	bl
  8233                              <1> ;	jnz	short sysvideo_15_197_41 ; same pixels for next row
  8234                              <1> ;	inc	esi
  8235                              <1> ;	dec	cl
  8236                              <1> ;	jnz	short sysvideo_15_197_40 ; next row of the character font
  8237 0000F7CA E89F010000          <1> 	call	sysvideo_15_197_39_0
  8238                              <1> 
  8239                              <1> sysvideo_15_197_44:
  8240                              <1> 	; 8*8*8*2 = 1024 bytes (4096 pixels)
  8241                              <1> 	;mov	word [u.r0], 1024 ; font size = 1024 bytes
  8242                              <1> 	;jmp	sysret
  8243                              <1> 	; 03/01/2021
  8244 0000F7CF E967FEFFFF          <1> 	jmp	sysvideo_15_196_21
  8245                              <1> 
  8246                              <1> sysvideo_15_197_45:
  8247 0000F7D4 80FF20              <1> 	cmp	bh, 32	; 16bpp ?
  8248 0000F7D7 7234                <1> 	jb	short sysvideo_15_197_68 ; no
  8249                              <1> 
  8250 0000F7D9 3C08                <1> 	cmp	al, 8	; 8 pixels per row ?
  8251 0000F7DB 770A                <1> 	ja	short sysvideo_15_197_50 ; no
  8252                              <1> 	; 8 pixels per row
  8253                              <1> ;sysvideo_15_197_46:
  8254                              <1> ;	lodsb
  8255                              <1> ;	push	edi
  8256                              <1> ;	mov	ah, 8
  8257                              <1> ;sysvideo_15_197_47:
  8258                              <1> ;	shr	al, 1
  8259                              <1> ;	jnc	short sysvideo_15_197_48
  8260                              <1> ;	mov	[edi], edx 
  8261                              <1> ;		; character pixel/forecolor,
  8262                              <1> ;		; 32 bpp (true colors)
  8263                              <1> ;sysvideo_15_197_48:	
  8264                              <1> ;	add	edi, 4
  8265                              <1> ;	dec	ah
  8266                              <1> ;	jnz	short sysvideo_15_197_47 ; next pixel of (same) row	
  8267                              <1> ;	pop	edi
  8268                              <1> ;	add	edi, ebp ; next row (same column position)
  8269                              <1> ;	dec	cl
  8270                              <1> ;	jnz	short sysvideo_15_197_46
  8271                              <1> ;				; next row of the character font
  8272 0000F7DD E8BF010000          <1> 	call	sysvideo_15_197_46
  8273                              <1> 
  8274                              <1> sysvideo_15_197_49:
  8275                              <1> 	; 1*8*1*4 = 32 bytes (128 pixels)
  8276                              <1> 	;mov	byte [u.r0], 32 ; font size = 32 bytes
  8277                              <1> 	;jmp	sysret
  8278                              <1> 	; 03/01/2021
  8279 0000F7E2 E970FEFFFF          <1> 	jmp	sysvideo_15_196_26
  8280                              <1> 
  8281                              <1> sysvideo_15_197_50:
  8282 0000F7E7 3C10                <1> 	cmp	al, 16
  8283 0000F7E9 770A                <1> 	ja	short sysvideo_15_197_56 ; >= 32 pixels per row
  8284                              <1> ;sysvideo_15_197_50_0:
  8285                              <1> ;	; 16 pixels per row
  8286                              <1> ;	; (8 bytes per row)
  8287                              <1> ;sysvideo_15_197_51:
  8288                              <1> ;	mov	bl, 2  ; 2 rows with same pixels
  8289                              <1> ;sysvideo_15_197_52:	
  8290                              <1> ;	mov	al, [esi]	
  8291                              <1> ;	push	edi
  8292                              <1> ;	mov	ah, 8
  8293                              <1> ;sysvideo_15_197_53:
  8294                              <1> ;	shr	al, 1
  8295                              <1> ;	jnc	short sysvideo_15_197_54
  8296                              <1> ;	; 2 pixels with same forecolor
  8297                              <1> ;	mov	[edi], edx
  8298                              <1> ;	mov	[edi+4], edx
  8299                              <1> ;		; character pixel/forecolor,
  8300                              <1> ;		; 32 bpp (true colors)
  8301                              <1> ;sysvideo_15_197_54:	
  8302                              <1> ;	add	edi, 8
  8303                              <1> ;	dec	ah
  8304                              <1> ;	jnz	short sysvideo_15_197_53 ; next pixel of (same) row	
  8305                              <1> ;	pop	edi
  8306                              <1> ;	add	edi, ebp ; next row
  8307                              <1> ;	dec	bl
  8308                              <1> ;	jnz	short sysvideo_15_197_52 ; same pixels for next row
  8309                              <1> ;	inc	esi
  8310                              <1> ;	dec	cl
  8311                              <1> ;	jnz	short sysvideo_15_197_51 ; next row of the character font
  8312 0000F7EB E8CA010000          <1> 	call	sysvideo_15_197_50_0
  8313                              <1> 
  8314                              <1> sysvideo_15_197_55:
  8315                              <1> 	; 2*8*2*4 = 128 bytes (256 pixels)
  8316                              <1> 	;mov	byte [u.r0], 128 ; font size = 128 bytes
  8317                              <1> 	;jmp	sysret
  8318                              <1> 	; 03/01/2021
  8319 0000F7F0 E977FEFFFF          <1> 	jmp	sysvideo_15_196_32
  8320                              <1> 
  8321                              <1> sysvideo_15_197_56:
  8322 0000F7F5 3C20                <1> 	cmp	al, 32
  8323 0000F7F7 770A                <1> 	ja	short sysvideo_15_197_62 ; 64 pixels per row
  8324                              <1> ;sysvideo_15_197_56_0:
  8325                              <1> ;	; 32 pixels per row
  8326                              <1> ;	; (16 bytes per row)
  8327                              <1> ;sysvideo_15_197_57:
  8328                              <1> ;	mov	bl, 4	; 4 rows with same pixels
  8329                              <1> ;sysvideo_15_197_58:	
  8330                              <1> ;	mov	al, [esi]	
  8331                              <1> ;	push	edi
  8332                              <1> ;	mov	ah, 8
  8333                              <1> ;sysvideo_15_197_59:
  8334                              <1> ;	shr	al, 1
  8335                              <1> ;	jnc	short sysvideo_15_197_60
  8336                              <1> ;	; 4 pixels with same forecolor
  8337                              <1> ;	mov	[edi], edx 
  8338                              <1> ;	mov	[edi+4], edx 
  8339                              <1> ;	mov	[edi+8], edx 
  8340                              <1> ;	mov	[edi+12], edx 
  8341                              <1> ;		; character pixel/forecolor,
  8342                              <1> ;		; 32 bpp (true colors)
  8343                              <1> ;sysvideo_15_197_60:	
  8344                              <1> ;	add	edi, 16
  8345                              <1> ;	dec	ah
  8346                              <1> ;	jnz	short sysvideo_15_197_59 ; next pixel of (same) row	
  8347                              <1> ;	pop	edi
  8348                              <1> ;	add	edi, ebp ; next row
  8349                              <1> ;	dec	bl
  8350                              <1> ;	jnz	short sysvideo_15_197_58 ; same pixels for next row
  8351                              <1> ;	inc	esi
  8352                              <1> ;	dec	cl
  8353                              <1> ;	jnz	short sysvideo_15_197_57 ; next row of the character font
  8354 0000F7F9 E8E0010000          <1> 	call	sysvideo_15_197_56_0
  8355                              <1> 
  8356                              <1> sysvideo_15_197_61:
  8357                              <1> 	; 4*8*4*4 = 512 bytes (1024 pixels)
  8358                              <1> 	;mov	word [u.r0], 512 ; font size = 512 bytes
  8359                              <1> 	;jmp	sysret
  8360                              <1> 	; 03/01/2021
  8361 0000F7FE E97EFEFFFF          <1> 	jmp	sysvideo_15_196_38
  8362                              <1> 
  8363                              <1> sysvideo_15_197_62:
  8364                              <1> ;	; 64 pixels per row
  8365                              <1> ;	; (16 bytes per row)
  8366                              <1> ;	mov	bx, dx
  8367                              <1> ;	shl	edx, 16 
  8368                              <1> ;	mov	dx, bx
  8369                              <1> ;sysvideo_15_197_63:
  8370                              <1> ;	mov	bl, 8	; 8 rows with same pixels
  8371                              <1> ;sysvideo_15_197_64:	
  8372                              <1> ;	mov	al, [esi]	
  8373                              <1> ;	push	edi
  8374                              <1> ;	mov	ah, 8
  8375                              <1> ;sysvideo_15_197_65:
  8376                              <1> ;	shr	al, 1
  8377                              <1> ;	jnc	short sysvideo_15_197_66
  8378                              <1> ;	; 8 pixels with same forecolor
  8379                              <1> ;	mov	[edi], edx 
  8380                              <1> ;	mov	[edi+4], edx 
  8381                              <1> ;	mov	[edi+8], edx 
  8382                              <1> ;	mov	[edi+12], edx 
  8383                              <1> ;	mov	[edi+16], edx 
  8384                              <1> ;	mov	[edi+20], edx 
  8385                              <1> ;	mov	[edi+24], edx 
  8386                              <1> ;	mov	[edi+28], edx 
  8387                              <1> ;		; character pixel/forecolor,
  8388                              <1> ;		; 32 bpp (true colors)
  8389                              <1> ;sysvideo_15_197_66:	
  8390                              <1> ;	add	edi, 32
  8391                              <1> ;	dec	ah
  8392                              <1> ;	jnz	short sysvideo_15_197_65 ; next pixel of (same) row	
  8393                              <1> ;	pop	edi
  8394                              <1> ;	add	edi, ebp ; next row
  8395                              <1> ;	dec	bl
  8396                              <1> ;	jnz	short sysvideo_15_197_64 ; same pixels for next row
  8397                              <1> ;	inc	esi
  8398                              <1> ;	dec	cl
  8399                              <1> ;	jnz	short sysvideo_15_197_63 ; next row of the character font
  8400 0000F803 E800020000          <1> 	call	sysvideo_15_197_62_0
  8401                              <1> 
  8402                              <1> sysvideo_15_197_67:
  8403                              <1> 	;; 8*8*8*4 = 2048 bytes (4096 pixels)
  8404                              <1> 	;mov	word [u.r0], 2048 ; font size = 2048 bytes
  8405                              <1> 	;jmp	sysret
  8406                              <1> 	; 03/01/2021
  8407 0000F808 E987FEFFFF          <1> 	jmp	sysvideo_15_196_44
  8408                              <1> 
  8409                              <1> sysvideo_15_197_68:
  8410                              <1> 	; bh = 24
  8411                              <1> 	; 24 bpp
  8412 0000F80D 3C08                <1> 	cmp	al, 8	; 8 pixels per row ?
  8413 0000F80F 7711                <1> 	ja	short sysvideo_15_197_73 ; no
  8414                              <1> 	; 8 pixels per row
  8415                              <1> ;sysvideo_15_197_69:
  8416                              <1> ;	lodsb
  8417                              <1> ;	push	edi
  8418                              <1> ;	mov	ah, 8
  8419                              <1> ;sysvideo_15_197_70:
  8420                              <1> ;	shr	al, 1
  8421                              <1> ;	jnc	short sysvideo_15_197_71
  8422                              <1> ;	;mov	ebx, edx
  8423                              <1> ;	;shr	ebx, 16
  8424                              <1> ;	;mov	[edi], dx
  8425                              <1> ;	;mov	[edi+2], bl
  8426                              <1> ;	call	sysvideo_15_196_91
  8427                              <1> ;		; character pixel/forecolor,
  8428                              <1> ;		; 24 bpp (true colors)
  8429                              <1> ;sysvideo_15_197_71:	
  8430                              <1> ;	add	edi, 3
  8431                              <1> ;	dec	ah
  8432                              <1> ;	jnz	short sysvideo_15_197_70 ; next pixel of (same) row	
  8433                              <1> ;	pop	edi
  8434                              <1> ;	add	edi, ebp ; next row (same column position)
  8435                              <1> ;	dec	cl
  8436                              <1> ;	jnz	short sysvideo_15_197_69
  8437                              <1> ;				; next row of the character font
  8438 0000F811 E831020000          <1> 	call	sysvideo_15_197_69
  8439                              <1> 
  8440                              <1> sysvideo_15_197_72:
  8441                              <1> 	; 1*8*1*3 = 24 bytes (64 pixels)
  8442 0000F816 C605[64030300]18    <1> 	mov	byte [u.r0], 24 ; font size = 24 bytes
  8443 0000F81D E9CAE0FFFF          <1> 	jmp	sysret
  8444                              <1> 
  8445                              <1> sysvideo_15_197_73:
  8446 0000F822 3C10                <1> 	cmp	al, 16
  8447 0000F824 7711                <1> 	ja	short sysvideo_15_197_79 ; >= 32 pixels per row
  8448                              <1> 	; 16 pixels per row
  8449                              <1> 	; (6 bytes per row)
  8450                              <1> ;sysvideo_15_197_74:
  8451                              <1> ;	mov	bl, 2  ; 2 rows with same pixels
  8452                              <1> ;sysvideo_15_197_75:	
  8453                              <1> ;	mov	al, [esi]	
  8454                              <1> ;	push	edi
  8455                              <1> ;	mov	ah, 8
  8456                              <1> ;sysvideo_15_197_76:
  8457                              <1> ;	shr	al, 1
  8458                              <1> ;	jnc	short sysvideo_15_197_77
  8459                              <1> ;	; 2 pixels with same forecolor
  8460                              <1> ;	;mov	ebx, edx
  8461                              <1> ;	;shr	ebx, 16
  8462                              <1> ;	;mov	[edi], dx
  8463                              <1> ;	;mov	[edi+2], bl
  8464                              <1> ;	call	sysvideo_15_196_91
  8465                              <1> ;	;mov	[edi+3], dx
  8466                              <1> ;	;mov	[edi+5], bl
  8467                              <1> ;	call	sysvideo_15_196_92	  
  8468                              <1> ;		; character pixel/forecolor,
  8469                              <1> ;		; 24 bpp (true colors)
  8470                              <1> ;sysvideo_15_197_77:	
  8471                              <1> ;	add	edi, 6
  8472                              <1> ;	dec	ah
  8473                              <1> ;	jnz	short sysvideo_15_197_76 ; next pixel of (same) row	
  8474                              <1> ;	pop	edi
  8475                              <1> ;	add	edi, ebp ; next row
  8476                              <1> ;	dec	bl
  8477                              <1> ;	jnz	short sysvideo_15_197_75 ; same pixels for next row
  8478                              <1> ;	inc	esi
  8479                              <1> ;	dec	cl
  8480                              <1> ;	jnz	short sysvideo_15_197_74 ; next row of the character font
  8481 0000F826 E838020000          <1> 	call	sysvideo_15_197_74
  8482                              <1> 
  8483                              <1> sysvideo_15_197_78:
  8484                              <1> 	; 2*8*2*3 = 96 bytes (256 pixels)
  8485 0000F82B C605[64030300]60    <1> 	mov	byte [u.r0], 96 ; font size = 96 bytes
  8486 0000F832 E9B5E0FFFF          <1> 	jmp	sysret
  8487                              <1> 
  8488                              <1> sysvideo_15_197_79:
  8489 0000F837 3C20                <1> 	cmp	al, 32
  8490 0000F839 7713                <1> 	ja	short sysvideo_15_197_85 ; 64 pixels per row
  8491                              <1> 	; 32 pixels per row
  8492                              <1> 	; (12 bytes per row)
  8493                              <1> ;sysvideo_15_197_80:
  8494                              <1> ;	mov	bl, 4	; 4 rows with same pixels
  8495                              <1> ;sysvideo_15_197_81:	
  8496                              <1> ;	mov	al, [esi]	
  8497                              <1> ;	push	edi
  8498                              <1> ;	mov	ah, 8
  8499                              <1> ;sysvideo_15_197_82:
  8500                              <1> ;	shr	al, 1
  8501                              <1> ;	jnc	short sysvideo_15_197_83
  8502                              <1> ;	; 4 pixels with same forecolor
  8503                              <1> ;	;mov	ebx, edx
  8504                              <1> ;	;shr	ebx, 16
  8505                              <1> ;	;mov	[edi], dx
  8506                              <1> ;	;mov	[edi+2], bl
  8507                              <1> ;	call	sysvideo_15_196_91
  8508                              <1> ;	;mov	[edi+3], dx
  8509                              <1> ;	;mov	[edi+5], bl
  8510                              <1> ;	;mov	[edi+6], dx
  8511                              <1> ;	;mov	[edi+8], bl
  8512                              <1> ;	;mov	[edi+9], dx
  8513                              <1> ;	;mov	[edi+11], bl
  8514                              <1> ;	call	sysvideo_15_196_93	 
  8515                              <1> ;		; character pixel/forecolor,
  8516                              <1> ;		; 24 bpp (true colors)
  8517                              <1> ;sysvideo_15_197_83:	
  8518                              <1> ;	add	edi, 12
  8519                              <1> ;	dec	ah
  8520                              <1> ;	jnz	short sysvideo_15_197_82 ; next pixel of (same) row	
  8521                              <1> ;	pop	edi
  8522                              <1> ;	add	edi, ebp ; next row
  8523                              <1> ;	dec	bl
  8524                              <1> ;	jnz	short sysvideo_15_197_81 ; same pixels for next row
  8525                              <1> ;	inc	esi
  8526                              <1> ;	dec	cl
  8527                              <1> ;	jnz	short sysvideo_15_197_80 ; next row of the character font
  8528 0000F83B E84C020000          <1> 	call	sysvideo_15_197_80
  8529                              <1> 
  8530                              <1> sysvideo_15_197_84:
  8531                              <1> 	; 4*8*4*3 = 384 bytes (1024 pixels)
  8532 0000F840 66C705[64030300]80- <1> 	mov	word [u.r0], 384 ; font size = 384 bytes
  8532 0000F848 01                  <1>
  8533 0000F849 E99EE0FFFF          <1> 	jmp	sysret
  8534                              <1> 
  8535                              <1> sysvideo_15_197_85:
  8536                              <1> ;	; 64 pixels per row
  8537                              <1> ;	; (24 bytes per row)
  8538                              <1> ;	mov	bx, dx
  8539                              <1> ;	shl	edx, 16 
  8540                              <1> ;	mov	dx, bx
  8541                              <1> ;sysvideo_15_197_86:
  8542                              <1> ;	mov	bl, 8	; 8 rows with same pixels
  8543                              <1> ;sysvideo_15_197_87:	
  8544                              <1> ;	mov	al, [esi]	
  8545                              <1> ;	push	edi
  8546                              <1> ;	mov	ah, 8
  8547                              <1> ;sysvideo_15_197_88:
  8548                              <1> ;	shr	al, 1
  8549                              <1> ;	jnc	short sysvideo_15_197_89
  8550                              <1> ;	; 8 pixels with same forecolor
  8551                              <1> ;	;mov	ebx, edx
  8552                              <1> ;	;shr	ebx, 16
  8553                              <1> ;	;mov	[edi], dx
  8554                              <1> ;	;mov	[edi+2], bl
  8555                              <1> ;	call	sysvideo_15_196_91
  8556                              <1> ;	;mov	[edi+3], dx
  8557                              <1> ;	;mov	[edi+5], bl
  8558                              <1> ;	;mov	[edi+6], dx
  8559                              <1> ;	;mov	[edi+8], bl
  8560                              <1> ;	;mov	[edi+9], dx
  8561                              <1> ;	;mov	[edi+11], bl
  8562                              <1> ;	;mov	[edi+12], dx
  8563                              <1> ;	;mov	[edi+14], bl
  8564                              <1> ;	;mov	[edi+15], dx
  8565                              <1> ;	;mov	[edi+17], bl
  8566                              <1> ;	;mov	[edi+18], dx
  8567                              <1> ;	;mov	[edi+20], bl
  8568                              <1> ;	;mov	[edi+21], dx
  8569                              <1> ;	;mov	[edi+23], bl
  8570                              <1> ;	call	sysvideo_15_196_94
  8571                              <1> ;		; character pixel/forecolor,
  8572                              <1> ;		; 24 bpp (true colors)
  8573                              <1> ;sysvideo_15_197_89:	
  8574                              <1> ;	add	edi, 24
  8575                              <1> ;	dec	ah
  8576                              <1> ;	jnz	short sysvideo_15_197_88 ; next pixel of (same) row	
  8577                              <1> ;	pop	edi
  8578                              <1> ;	add	edi, ebp ; next row
  8579                              <1> ;	dec	bl
  8580                              <1> ;	jnz	short sysvideo_15_197_87 ; same pixels for next row
  8581                              <1> ;	inc	esi
  8582                              <1> ;	dec	cl
  8583                              <1> ;	jnz	short sysvideo_15_197_86 ; next row of the character font
  8584 0000F84E E862020000          <1> 	call	sysvideo_15_197_85_0
  8585                              <1> 
  8586                              <1> sysvideo_15_197_90:
  8587                              <1> 	; 8*8*8*3 = 1536 bytes (4096 pixels)
  8588 0000F853 66C705[64030300]00- <1> 	mov	word [u.r0], 1536 ; font size = 1536 bytes
  8588 0000F85B 06                  <1>
  8589 0000F85C E98BE0FFFF          <1> 	jmp	sysret
  8590                              <1> 
  8591                              <1> 
  8592                              <1> char_size_option:
  8593                              <1> 	; 0 = 8x16, 1 = 8x8, 2 = 2x(8x16), 3 = 2x(8x8) 
  8594                              <1> 	; 4 = 4x(8x16), 5 = 4x(8x8), 6 = 8x(8x16), 7 = 8x(8x8) 
  8595                              <1> 	; character size (while writing at LFB address)
  8596 0000F861 0810080810201010    <1> 	dw	1008h, 0808h, 2010h, 1010h
  8597 0000F869 2040202040804040    <1> 	dw	4020h, 2020h, 8040h, 4040h
  8598                              <1> 
  8599                              <1> sysvideo_15_196_0:
  8600                              <1> sysvideo_15_197_0:
  8601                              <1> 	; 03/01/2021
  8602                              <1> 	; 8 pixels per row
  8603 0000F871 AC                  <1> 	lodsb
  8604 0000F872 57                  <1> 	push	edi
  8605 0000F873 B408                <1> 	mov	ah, 8
  8606                              <1> sysvideo_15_196_0_1:
  8607 0000F875 D0E8                <1> 	shr	al, 1
  8608 0000F877 7302                <1> 	jnc	short sysvideo_15_196_0_2
  8609 0000F879 8817                <1> 	mov	[edi], dl 
  8610                              <1> 		; character pixel/forecolor,
  8611                              <1> 		; 8 bpp (256 colors)
  8612                              <1> sysvideo_15_196_0_2:	
  8613 0000F87B 47                  <1> 	inc	edi
  8614 0000F87C FECC                <1> 	dec	ah
  8615 0000F87E 75F5                <1> 	jnz	short sysvideo_15_196_0_1
  8616                              <1> 				; next pixel of (same) row	
  8617 0000F880 5F                  <1> 	pop	edi
  8618 0000F881 01EF                <1> 	add	edi, ebp	; next row (same column position)
  8619 0000F883 FEC9                <1> 	dec	cl
  8620 0000F885 75EA                <1> 	jnz	short sysvideo_15_196_0
  8621                              <1> 				; next row of the character font
  8622 0000F887 C3                  <1> 	retn
  8623                              <1> 
  8624                              <1> sysvideo_15_196_4_0:
  8625                              <1> sysvideo_15_197_4_0:
  8626                              <1> 	; 16 pixels per row
  8627 0000F888 88D6                <1> 	mov	dh, dl
  8628                              <1> sysvideo_15_196_5:
  8629 0000F88A B302                <1> 	mov	bl, 2  ; 2 rows with same pixels
  8630                              <1> sysvideo_15_196_6:	
  8631 0000F88C 8A06                <1> 	mov	al, [esi]	
  8632 0000F88E 57                  <1> 	push	edi
  8633 0000F88F B408                <1> 	mov	ah, 8
  8634                              <1> sysvideo_15_196_7:
  8635 0000F891 D0E8                <1> 	shr	al, 1
  8636 0000F893 7303                <1> 	jnc	short sysvideo_15_196_8
  8637                              <1> 	; 2 pixels with same forecolor
  8638 0000F895 668917              <1> 	mov	[edi], dx
  8639                              <1> 		; character pixel/forecolor,
  8640                              <1> 		; 8 bpp (256 colors)
  8641                              <1> sysvideo_15_196_8:	
  8642 0000F898 47                  <1> 	inc	edi
  8643 0000F899 47                  <1> 	inc	edi
  8644 0000F89A FECC                <1> 	dec	ah
  8645 0000F89C 75F3                <1> 	jnz	short sysvideo_15_196_7 ; next pixel of (same) row	
  8646 0000F89E 5F                  <1> 	pop	edi
  8647 0000F89F 01EF                <1> 	add	edi, ebp ; next row
  8648 0000F8A1 FECB                <1> 	dec	bl
  8649 0000F8A3 75E7                <1> 	jnz	short sysvideo_15_196_6 ; same pixels for next row
  8650 0000F8A5 46                  <1> 	inc	esi
  8651 0000F8A6 FEC9                <1> 	dec	cl
  8652 0000F8A8 75E0                <1> 	jnz	short sysvideo_15_196_5 ; next row of the character font
  8653 0000F8AA C3                  <1> 	retn
  8654                              <1> 
  8655                              <1> sysvideo_15_196_10_0:
  8656                              <1> sysvideo_15_197_10_0:
  8657                              <1> 	; 32 pixels per row
  8658 0000F8AB 88D6                <1> 	mov	dh, dl
  8659 0000F8AD C1CA08              <1> 	ror	edx, 8  ; byte 2 -> dh, dl -> byte 3
  8660                              <1> 			; dh -> dl
  8661 0000F8B0 88D6                <1> 	mov	dh, dl	; byte 1 -> dl 
  8662                              <1> sysvideo_15_196_11:
  8663 0000F8B2 B304                <1> 	mov	bl, 4	; 4 rows with same pixels
  8664                              <1> sysvideo_15_196_12:	
  8665 0000F8B4 8A06                <1> 	mov	al, [esi]	
  8666 0000F8B6 57                  <1> 	push	edi
  8667 0000F8B7 B408                <1> 	mov	ah, 8
  8668                              <1> sysvideo_15_196_13:
  8669 0000F8B9 D0E8                <1> 	shr	al, 1
  8670 0000F8BB 7302                <1> 	jnc	short sysvideo_15_196_14
  8671                              <1> 	; 4 pixels with same forecolor
  8672 0000F8BD 8917                <1> 	mov	[edi], edx 
  8673                              <1> 		; character pixel/forecolor,
  8674                              <1> 		; 8 bpp (256 colors)
  8675                              <1> sysvideo_15_196_14:	
  8676 0000F8BF 83C704              <1> 	add	edi, 4
  8677 0000F8C2 FECC                <1> 	dec	ah
  8678 0000F8C4 75F3                <1> 	jnz	short sysvideo_15_196_13 ; next pixel of (same) row	
  8679 0000F8C6 5F                  <1> 	pop	edi
  8680 0000F8C7 01EF                <1> 	add	edi, ebp ; next row
  8681 0000F8C9 FECB                <1> 	dec	bl
  8682 0000F8CB 75E7                <1> 	jnz	short sysvideo_15_196_12 ; same pixels for next row
  8683 0000F8CD 46                  <1> 	inc	esi
  8684 0000F8CE FEC9                <1> 	dec	cl
  8685 0000F8D0 75E0                <1> 	jnz	short sysvideo_15_196_11 ; next row of the character font
  8686 0000F8D2 C3                  <1> 	retn
  8687                              <1> 
  8688                              <1> sysvideo_15_196_16_0:
  8689                              <1> sysvideo_15_197_16_0:
  8690                              <1> 	; 64 pixels per row
  8691 0000F8D3 88D6                <1> 	mov	dh, dl
  8692 0000F8D5 C1CA08              <1> 	ror	edx, 8  ; byte 2 -> dh, dl -> byte 3
  8693                              <1> 			; dh -> dl
  8694 0000F8D8 88D6                <1> 	mov	dh, dl	; byte 1 -> dl 
  8695                              <1> sysvideo_15_196_17:
  8696 0000F8DA B308                <1> 	mov	bl, 8	; 8 rows with same pixels
  8697                              <1> sysvideo_15_196_18:	
  8698 0000F8DC 8A06                <1> 	mov	al, [esi]	
  8699 0000F8DE 57                  <1> 	push	edi
  8700 0000F8DF B408                <1> 	mov	ah, 8
  8701                              <1> sysvideo_15_196_19:
  8702 0000F8E1 D0E8                <1> 	shr	al, 1
  8703 0000F8E3 7305                <1> 	jnc	short sysvideo_15_196_20
  8704                              <1> 	; 8 pixels with same forecolor
  8705 0000F8E5 8917                <1> 	mov	[edi], edx 
  8706                              <1> 		; character pixel/forecolor,
  8707                              <1> 		; 8 bpp (256 colors)
  8708 0000F8E7 895704              <1> 	mov	[edi+4], edx 
  8709                              <1> 		; character pixel/forecolor,
  8710                              <1> 		; 8 bpp (256 colors)
  8711                              <1> sysvideo_15_196_20:	
  8712 0000F8EA 83C708              <1> 	add	edi, 8
  8713 0000F8ED FECC                <1> 	dec	ah
  8714 0000F8EF 75F0                <1> 	jnz	short sysvideo_15_196_19 ; next pixel of (same) row	
  8715 0000F8F1 5F                  <1> 	pop	edi
  8716 0000F8F2 01EF                <1> 	add	edi, ebp ; next row
  8717 0000F8F4 FECB                <1> 	dec	bl
  8718 0000F8F6 75E4                <1> 	jnz	short sysvideo_15_196_18 ; same pixels for next row
  8719 0000F8F8 46                  <1> 	inc	esi
  8720 0000F8F9 FEC9                <1> 	dec	cl
  8721 0000F8FB 75DD                <1> 	jnz	short sysvideo_15_196_17 ; next row of the character font
  8722 0000F8FD C3                  <1> 	retn
  8723                              <1> 
  8724                              <1> sysvideo_15_196_23:
  8725                              <1> sysvideo_15_197_23:
  8726                              <1> 	; 03/01/2021
  8727                              <1> 	; 8 pixels per row
  8728 0000F8FE AC                  <1> 	lodsb
  8729 0000F8FF 57                  <1> 	push	edi
  8730 0000F900 B408                <1> 	mov	ah, 8
  8731                              <1> sysvideo_15_196_24:
  8732 0000F902 D0E8                <1> 	shr	al, 1
  8733 0000F904 7303                <1> 	jnc	short sysvideo_15_196_25
  8734 0000F906 668917              <1> 	mov	[edi], dx 
  8735                              <1> 		; character pixel/forecolor,
  8736                              <1> 		; 16 bpp (65536 colors)
  8737                              <1> sysvideo_15_196_25:	
  8738 0000F909 47                  <1> 	inc	edi
  8739 0000F90A 47                  <1> 	inc	edi
  8740 0000F90B FECC                <1> 	dec	ah
  8741 0000F90D 75F3                <1> 	jnz	short sysvideo_15_196_24 ; next pixel of (same) row	
  8742 0000F90F 5F                  <1> 	pop	edi
  8743 0000F910 01EF                <1> 	add	edi, ebp ; next row (same column position)
  8744 0000F912 FEC9                <1> 	dec	cl
  8745 0000F914 75E8                <1> 	jnz	short sysvideo_15_196_23
  8746                              <1> 				; next row of the character font
  8747 0000F916 C3                  <1> 	retn
  8748                              <1> 
  8749                              <1> sysvideo_15_196_27_0:
  8750                              <1> sysvideo_15_197_27_0:
  8751                              <1> 	; 16 pixels per row
  8752                              <1> 	; (4 bytes per row)
  8753 0000F917 6689D3              <1> 	mov	bx, dx
  8754 0000F91A C1E210              <1> 	shl	edx, 16 
  8755 0000F91D 6689DA              <1> 	mov	dx, bx
  8756                              <1> sysvideo_15_196_28:
  8757 0000F920 B302                <1> 	mov	bl, 2  ; 2 rows with same pixels
  8758                              <1> sysvideo_15_196_29:	
  8759 0000F922 8A06                <1> 	mov	al, [esi]	
  8760 0000F924 57                  <1> 	push	edi
  8761 0000F925 B408                <1> 	mov	ah, 8
  8762                              <1> sysvideo_15_196_30:
  8763 0000F927 D0E8                <1> 	shr	al, 1
  8764 0000F929 7302                <1> 	jnc	short sysvideo_15_196_31
  8765                              <1> 	; 2 pixels with same forecolor
  8766 0000F92B 8917                <1> 	mov	[edi], edx
  8767                              <1> 		; character pixel/forecolor,
  8768                              <1> 		; 16 bpp (65536 colors)
  8769                              <1> sysvideo_15_196_31:	
  8770 0000F92D 83C704              <1> 	add	edi, 4
  8771 0000F930 FECC                <1> 	dec	ah
  8772 0000F932 75F3                <1> 	jnz	short sysvideo_15_196_30 ; next pixel of (same) row	
  8773 0000F934 5F                  <1> 	pop	edi
  8774 0000F935 01EF                <1> 	add	edi, ebp ; next row
  8775 0000F937 FECB                <1> 	dec	bl
  8776 0000F939 75E7                <1> 	jnz	short sysvideo_15_196_29 ; same pixels for next row
  8777 0000F93B 46                  <1> 	inc	esi
  8778 0000F93C FEC9                <1> 	dec	cl
  8779 0000F93E 75E0                <1> 	jnz	short sysvideo_15_196_28 ; next row of the character font
  8780 0000F940 C3                  <1> 	retn
  8781                              <1> 
  8782                              <1> sysvideo_15_196_33_0:
  8783                              <1> sysvideo_15_197_33_0:
  8784                              <1> 	; 32 pixels per row
  8785                              <1> 	; (8 bytes per row)
  8786 0000F941 6689D3              <1> 	mov	bx, dx
  8787 0000F944 C1E210              <1> 	shl	edx, 16 
  8788 0000F947 6689DA              <1> 	mov	dx, bx
  8789                              <1> sysvideo_15_196_34:
  8790 0000F94A B304                <1> 	mov	bl, 4	; 4 rows with same pixels
  8791                              <1> sysvideo_15_196_35:	
  8792 0000F94C 8A06                <1> 	mov	al, [esi]	
  8793 0000F94E 57                  <1> 	push	edi
  8794 0000F94F B408                <1> 	mov	ah, 8
  8795                              <1> sysvideo_15_196_36:
  8796 0000F951 D0E8                <1> 	shr	al, 1
  8797 0000F953 7305                <1> 	jnc	short sysvideo_15_196_37
  8798                              <1> 	; 4 pixels with same forecolor
  8799 0000F955 8917                <1> 	mov	[edi], edx 
  8800                              <1> 		; character pixel/forecolor,
  8801                              <1> 		; 16 bpp (65536 colors)
  8802 0000F957 895704              <1> 	mov	[edi+4], edx 
  8803                              <1> 		; character pixel/forecolor,
  8804                              <1> 		; 16 bpp (65536 colors)
  8805                              <1> sysvideo_15_196_37:	
  8806 0000F95A 83C708              <1> 	add	edi, 8
  8807 0000F95D FECC                <1> 	dec	ah
  8808 0000F95F 75F0                <1> 	jnz	short sysvideo_15_196_36 ; next pixel of (same) row	
  8809 0000F961 5F                  <1> 	pop	edi
  8810 0000F962 01EF                <1> 	add	edi, ebp ; next row
  8811 0000F964 FECB                <1> 	dec	bl
  8812 0000F966 75E4                <1> 	jnz	short sysvideo_15_196_35 ; same pixels for next row
  8813 0000F968 46                  <1> 	inc	esi
  8814 0000F969 FEC9                <1> 	dec	cl
  8815 0000F96B 75DD                <1> 	jnz	short sysvideo_15_196_34 ; next row of the character font
  8816 0000F96D C3                  <1> 	retn
  8817                              <1> 
  8818                              <1> sysvideo_15_196_39_0:
  8819                              <1> sysvideo_15_197_39_0:
  8820                              <1> 	; 64 pixels per row
  8821                              <1> 	; (16 bytes per row)
  8822 0000F96E 6689D3              <1> 	mov	bx, dx
  8823 0000F971 C1E210              <1> 	shl	edx, 16 
  8824 0000F974 6689DA              <1> 	mov	dx, bx
  8825                              <1> sysvideo_15_196_40:
  8826 0000F977 B308                <1> 	mov	bl, 8	; 8 rows with same pixels
  8827                              <1> sysvideo_15_196_41:	
  8828 0000F979 8A06                <1> 	mov	al, [esi]	
  8829 0000F97B 57                  <1> 	push	edi
  8830 0000F97C B408                <1> 	mov	ah, 8
  8831                              <1> sysvideo_15_196_42:
  8832 0000F97E D0E8                <1> 	shr	al, 1
  8833 0000F980 730B                <1> 	jnc	short sysvideo_15_196_43
  8834                              <1> 	; 8 pixels with same forecolor
  8835 0000F982 8917                <1> 	mov	[edi], edx 
  8836 0000F984 895704              <1> 	mov	[edi+4], edx 
  8837 0000F987 895708              <1> 	mov	[edi+8], edx 
  8838 0000F98A 89570C              <1> 	mov	[edi+12], edx 
  8839                              <1> 		; character pixel/forecolor,
  8840                              <1> 		; 16 bpp (65536 colors)
  8841                              <1> sysvideo_15_196_43:	
  8842 0000F98D 83C710              <1> 	add	edi, 16
  8843 0000F990 FECC                <1> 	dec	ah
  8844 0000F992 75EA                <1> 	jnz	short sysvideo_15_196_42 ; next pixel of (same) row	
  8845 0000F994 5F                  <1> 	pop	edi
  8846 0000F995 01EF                <1> 	add	edi, ebp ; next row
  8847 0000F997 FECB                <1> 	dec	bl
  8848 0000F999 75DE                <1> 	jnz	short sysvideo_15_196_41 ; same pixels for next row
  8849 0000F99B 46                  <1> 	inc	esi
  8850 0000F99C FEC9                <1> 	dec	cl
  8851 0000F99E 75D7                <1> 	jnz	short sysvideo_15_196_40 ; next row of the character font
  8852 0000F9A0 C3                  <1> 	retn
  8853                              <1> 
  8854                              <1> sysvideo_15_196_46:
  8855                              <1> sysvideo_15_197_46:
  8856                              <1> 	; 8 pixels per row
  8857 0000F9A1 AC                  <1> 	lodsb
  8858 0000F9A2 57                  <1> 	push	edi
  8859 0000F9A3 B408                <1> 	mov	ah, 8
  8860                              <1> sysvideo_15_196_47:
  8861 0000F9A5 D0E8                <1> 	shr	al, 1
  8862 0000F9A7 7302                <1> 	jnc	short sysvideo_15_196_48
  8863 0000F9A9 8917                <1> 	mov	[edi], edx 
  8864                              <1> 		; character pixel/forecolor,
  8865                              <1> 		; 32 bpp (true colors)
  8866                              <1> sysvideo_15_196_48:	
  8867 0000F9AB 83C704              <1> 	add	edi, 4
  8868 0000F9AE FECC                <1> 	dec	ah
  8869 0000F9B0 75F3                <1> 	jnz	short sysvideo_15_196_47 ; next pixel of (same) row	
  8870 0000F9B2 5F                  <1> 	pop	edi
  8871 0000F9B3 01EF                <1> 	add	edi, ebp ; next row (same column position)
  8872 0000F9B5 FEC9                <1> 	dec	cl
  8873 0000F9B7 75E8                <1> 	jnz	short sysvideo_15_196_46
  8874                              <1> 				; next row of the character font
  8875 0000F9B9 C3                  <1> 	retn
  8876                              <1> 
  8877                              <1> sysvideo_15_196_50_0:
  8878                              <1> sysvideo_15_197_50_0:
  8879                              <1> 	; 16 pixels per row
  8880                              <1> 	; (8 bytes per row)
  8881                              <1> sysvideo_15_196_51:
  8882 0000F9BA B302                <1> 	mov	bl, 2  ; 2 rows with same pixels
  8883                              <1> sysvideo_15_196_52:	
  8884 0000F9BC 8A06                <1> 	mov	al, [esi]	
  8885 0000F9BE 57                  <1> 	push	edi
  8886 0000F9BF B408                <1> 	mov	ah, 8
  8887                              <1> sysvideo_15_196_53:
  8888 0000F9C1 D0E8                <1> 	shr	al, 1
  8889 0000F9C3 7305                <1> 	jnc	short sysvideo_15_196_54
  8890                              <1> 	; 2 pixels with same forecolor
  8891 0000F9C5 8917                <1> 	mov	[edi], edx
  8892 0000F9C7 895704              <1> 	mov	[edi+4], edx
  8893                              <1> 		; character pixel/forecolor,
  8894                              <1> 		; 32 bpp (true colors)
  8895                              <1> sysvideo_15_196_54:	
  8896 0000F9CA 83C708              <1> 	add	edi, 8
  8897 0000F9CD FECC                <1> 	dec	ah
  8898 0000F9CF 75F0                <1> 	jnz	short sysvideo_15_196_53 ; next pixel of (same) row	
  8899 0000F9D1 5F                  <1> 	pop	edi
  8900 0000F9D2 01EF                <1> 	add	edi, ebp ; next row
  8901 0000F9D4 FECB                <1> 	dec	bl
  8902 0000F9D6 75E4                <1> 	jnz	short sysvideo_15_196_52 ; same pixels for next row
  8903 0000F9D8 46                  <1> 	inc	esi
  8904 0000F9D9 FEC9                <1> 	dec	cl
  8905 0000F9DB 75DD                <1> 	jnz	short sysvideo_15_196_51 ; next row of the character font
  8906 0000F9DD C3                  <1> 	retn
  8907                              <1> 
  8908                              <1> sysvideo_15_196_56_0:
  8909                              <1> sysvideo_15_197_56_0:
  8910                              <1> 	; 32 pixels per row
  8911                              <1> 	; (16 bytes per row)
  8912                              <1> sysvideo_15_196_57:
  8913 0000F9DE B304                <1> 	mov	bl, 4	; 4 rows with same pixels
  8914                              <1> sysvideo_15_196_58:	
  8915 0000F9E0 8A06                <1> 	mov	al, [esi]	
  8916 0000F9E2 57                  <1> 	push	edi
  8917 0000F9E3 B408                <1> 	mov	ah, 8
  8918                              <1> sysvideo_15_196_59:
  8919 0000F9E5 D0E8                <1> 	shr	al, 1
  8920 0000F9E7 730B                <1> 	jnc	short sysvideo_15_196_60
  8921                              <1> 	; 4 pixels with same forecolor
  8922 0000F9E9 8917                <1> 	mov	[edi], edx 
  8923 0000F9EB 895704              <1> 	mov	[edi+4], edx 
  8924 0000F9EE 895708              <1> 	mov	[edi+8], edx 
  8925 0000F9F1 89570C              <1> 	mov	[edi+12], edx 
  8926                              <1> 		; character pixel/forecolor,
  8927                              <1> 		; 32 bpp (true colors)
  8928                              <1> sysvideo_15_196_60:	
  8929 0000F9F4 83C710              <1> 	add	edi, 16
  8930 0000F9F7 FECC                <1> 	dec	ah
  8931 0000F9F9 75EA                <1> 	jnz	short sysvideo_15_196_59 ; next pixel of (same) row	
  8932 0000F9FB 5F                  <1> 	pop	edi
  8933 0000F9FC 01EF                <1> 	add	edi, ebp ; next row
  8934 0000F9FE FECB                <1> 	dec	bl
  8935 0000FA00 75DE                <1> 	jnz	short sysvideo_15_196_58 ; same pixels for next row
  8936 0000FA02 46                  <1> 	inc	esi
  8937 0000FA03 FEC9                <1> 	dec	cl
  8938 0000FA05 75D7                <1> 	jnz	short sysvideo_15_196_57 ; next row of the character font
  8939 0000FA07 C3                  <1> 	retn
  8940                              <1> 
  8941                              <1> sysvideo_15_196_62_0:
  8942                              <1> sysvideo_15_197_62_0:
  8943                              <1> 	; 64 pixels per row
  8944                              <1> 	; (16 bytes per row)
  8945 0000FA08 6689D3              <1> 	mov	bx, dx
  8946 0000FA0B C1E210              <1> 	shl	edx, 16 
  8947 0000FA0E 6689DA              <1> 	mov	dx, bx
  8948                              <1> sysvideo_15_196_63:
  8949 0000FA11 B308                <1> 	mov	bl, 8	; 8 rows with same pixels
  8950                              <1> sysvideo_15_196_64:	
  8951 0000FA13 8A06                <1> 	mov	al, [esi]	
  8952 0000FA15 57                  <1> 	push	edi
  8953 0000FA16 B408                <1> 	mov	ah, 8
  8954                              <1> sysvideo_15_196_65:
  8955 0000FA18 D0E8                <1> 	shr	al, 1
  8956 0000FA1A 7317                <1> 	jnc	short sysvideo_15_196_66
  8957                              <1> 	; 8 pixels with same forecolor
  8958 0000FA1C 8917                <1> 	mov	[edi], edx 
  8959 0000FA1E 895704              <1> 	mov	[edi+4], edx 
  8960 0000FA21 895708              <1> 	mov	[edi+8], edx 
  8961 0000FA24 89570C              <1> 	mov	[edi+12], edx 
  8962 0000FA27 895710              <1> 	mov	[edi+16], edx 
  8963 0000FA2A 895714              <1> 	mov	[edi+20], edx 
  8964 0000FA2D 895718              <1> 	mov	[edi+24], edx 
  8965 0000FA30 89571C              <1> 	mov	[edi+28], edx 
  8966                              <1> 		; character pixel/forecolor,
  8967                              <1> 		; 32 bpp (true colors)
  8968                              <1> sysvideo_15_196_66:	
  8969 0000FA33 83C720              <1> 	add	edi, 32
  8970 0000FA36 FECC                <1> 	dec	ah
  8971 0000FA38 75DE                <1> 	jnz	short sysvideo_15_196_65 ; next pixel of (same) row	
  8972 0000FA3A 5F                  <1> 	pop	edi
  8973 0000FA3B 01EF                <1> 	add	edi, ebp ; next row
  8974 0000FA3D FECB                <1> 	dec	bl
  8975 0000FA3F 75D2                <1> 	jnz	short sysvideo_15_196_64 ; same pixels for next row
  8976 0000FA41 46                  <1> 	inc	esi
  8977 0000FA42 FEC9                <1> 	dec	cl
  8978 0000FA44 75CB                <1> 	jnz	short sysvideo_15_196_63 ; next row of the character font
  8979 0000FA46 C3                  <1> 	retn
  8980                              <1> 
  8981                              <1> sysvideo_15_196_69:
  8982                              <1> sysvideo_15_197_69:
  8983                              <1> 	; 03/01/2021
  8984 0000FA47 AC                  <1> 	lodsb
  8985 0000FA48 57                  <1> 	push	edi
  8986 0000FA49 B408                <1> 	mov	ah, 8
  8987                              <1> sysvideo_15_196_70:
  8988 0000FA4B D0E8                <1> 	shr	al, 1
  8989 0000FA4D 7305                <1> 	jnc	short sysvideo_15_196_71
  8990                              <1> 	;mov	ebx, edx
  8991                              <1> 	;shr	ebx, 16
  8992                              <1> 	;mov	[edi], dx
  8993                              <1> 	;mov	[edi+2], bl
  8994 0000FA4F E893000000          <1> 	call	sysvideo_15_196_91
  8995                              <1> 		; character pixel/forecolor,
  8996                              <1> 		; 24 bpp (true colors)
  8997                              <1> sysvideo_15_196_71:	
  8998 0000FA54 83C703              <1> 	add	edi, 3
  8999 0000FA57 FECC                <1> 	dec	ah
  9000 0000FA59 75F0                <1> 	jnz	short sysvideo_15_196_70 ; next pixel of (same) row	
  9001 0000FA5B 5F                  <1> 	pop	edi
  9002 0000FA5C 01EF                <1> 	add	edi, ebp ; next row (same column position)
  9003 0000FA5E FEC9                <1> 	dec	cl
  9004 0000FA60 75E5                <1> 	jnz	short sysvideo_15_196_69
  9005                              <1> 				; next row of the character font
  9006 0000FA62 C3                  <1> 	retn
  9007                              <1> 
  9008                              <1> sysvideo_15_196_74:
  9009                              <1> sysvideo_15_197_74:
  9010                              <1> 	; 16 pixels per row
  9011                              <1> 	; (6 bytes per row)
  9012 0000FA63 B302                <1> 	mov	bl, 2  ; 2 rows with same pixels
  9013                              <1> sysvideo_15_196_75:	
  9014 0000FA65 8A06                <1> 	mov	al, [esi]	
  9015 0000FA67 57                  <1> 	push	edi
  9016 0000FA68 B408                <1> 	mov	ah, 8
  9017                              <1> sysvideo_15_196_76:
  9018 0000FA6A D0E8                <1> 	shr	al, 1
  9019 0000FA6C 730A                <1> 	jnc	short sysvideo_15_196_77
  9020                              <1> 	; 2 pixels with same forecolor
  9021                              <1> 	;mov	ebx, edx
  9022                              <1> 	;shr	ebx, 16
  9023                              <1> 	;mov	[edi], dx
  9024                              <1> 	;mov	[edi+2], bl
  9025 0000FA6E E874000000          <1> 	call	sysvideo_15_196_91
  9026                              <1> 	;mov	[edi+3], dx
  9027                              <1> 	;mov	[edi+5], bl
  9028 0000FA73 E87B000000          <1> 	call	sysvideo_15_196_92	  
  9029                              <1> 		; character pixel/forecolor,
  9030                              <1> 		; 24 bpp (true colors)
  9031                              <1> sysvideo_15_196_77:	
  9032 0000FA78 83C706              <1> 	add	edi, 6
  9033 0000FA7B FECC                <1> 	dec	ah
  9034 0000FA7D 75EB                <1> 	jnz	short sysvideo_15_196_76 ; next pixel of (same) row	
  9035 0000FA7F 5F                  <1> 	pop	edi
  9036 0000FA80 01EF                <1> 	add	edi, ebp ; next row
  9037 0000FA82 FECB                <1> 	dec	bl
  9038 0000FA84 75DF                <1> 	jnz	short sysvideo_15_196_75 ; same pixels for next row
  9039 0000FA86 46                  <1> 	inc	esi
  9040 0000FA87 FEC9                <1> 	dec	cl
  9041 0000FA89 75D8                <1> 	jnz	short sysvideo_15_196_74 ; next row of the character font
  9042 0000FA8B C3                  <1> 	retn
  9043                              <1> 
  9044                              <1> sysvideo_15_196_80:
  9045                              <1> sysvideo_15_197_80:
  9046                              <1> 	; 32 pixels per row
  9047                              <1> 	; (12 bytes per row)
  9048 0000FA8C B304                <1> 	mov	bl, 4	; 4 rows with same pixels
  9049                              <1> sysvideo_15_196_81:	
  9050 0000FA8E 8A06                <1> 	mov	al, [esi]	
  9051 0000FA90 57                  <1> 	push	edi
  9052 0000FA91 B408                <1> 	mov	ah, 8
  9053                              <1> sysvideo_15_196_82:
  9054 0000FA93 D0E8                <1> 	shr	al, 1
  9055 0000FA95 730A                <1> 	jnc	short sysvideo_15_196_83
  9056                              <1> 	; 4 pixels with same forecolor
  9057                              <1> 	;mov	ebx, edx
  9058                              <1> 	;shr	ebx, 16
  9059                              <1> 	;mov	[edi], dx
  9060                              <1> 	;mov	[edi+2], bl
  9061 0000FA97 E84B000000          <1> 	call	sysvideo_15_196_91
  9062                              <1> 	;mov	[edi+3], dx
  9063                              <1> 	;mov	[edi+5], bl
  9064                              <1> 	;mov	[edi+6], dx
  9065                              <1> 	;mov	[edi+8], bl
  9066                              <1> 	;mov	[edi+9], dx
  9067                              <1> 	;mov	[edi+11], bl
  9068 0000FA9C E85A000000          <1> 	call	sysvideo_15_196_93	 
  9069                              <1> 		; character pixel/forecolor,
  9070                              <1> 		; 24 bpp (true colors)
  9071                              <1> sysvideo_15_196_83:	
  9072 0000FAA1 83C70C              <1> 	add	edi, 12
  9073 0000FAA4 FECC                <1> 	dec	ah
  9074 0000FAA6 75EB                <1> 	jnz	short sysvideo_15_196_82 ; next pixel of (same) row	
  9075 0000FAA8 5F                  <1> 	pop	edi
  9076 0000FAA9 01EF                <1> 	add	edi, ebp ; next row
  9077 0000FAAB FECB                <1> 	dec	bl
  9078 0000FAAD 75DF                <1> 	jnz	short sysvideo_15_196_81 ; same pixels for next row
  9079 0000FAAF 46                  <1> 	inc	esi
  9080 0000FAB0 FEC9                <1> 	dec	cl
  9081 0000FAB2 75D8                <1> 	jnz	short sysvideo_15_196_80 ; next row of the character font
  9082 0000FAB4 C3                  <1> 	retn
  9083                              <1> 
  9084                              <1> sysvideo_15_196_85_0:
  9085                              <1> sysvideo_15_197_85_0:
  9086                              <1> 	; 64 pixels per row
  9087                              <1> 	; (24 bytes per row)
  9088 0000FAB5 6689D3              <1> 	mov	bx, dx
  9089 0000FAB8 C1E210              <1> 	shl	edx, 16 
  9090 0000FABB 6689DA              <1> 	mov	dx, bx
  9091                              <1> sysvideo_15_196_86:
  9092 0000FABE B308                <1> 	mov	bl, 8	; 8 rows with same pixels
  9093                              <1> sysvideo_15_196_87:	
  9094 0000FAC0 8A06                <1> 	mov	al, [esi]	
  9095 0000FAC2 57                  <1> 	push	edi
  9096 0000FAC3 B408                <1> 	mov	ah, 8
  9097                              <1> sysvideo_15_196_88:
  9098 0000FAC5 D0E8                <1> 	shr	al, 1
  9099 0000FAC7 730A                <1> 	jnc	short sysvideo_15_196_89
  9100                              <1> 	; 8 pixels with same forecolor
  9101                              <1> 	;mov	ebx, edx
  9102                              <1> 	;shr	ebx, 16
  9103                              <1> 	;mov	[edi], dx
  9104                              <1> 	;mov	[edi+2], bl
  9105 0000FAC9 E819000000          <1> 	call	sysvideo_15_196_91
  9106                              <1> 	;mov	[edi+3], dx
  9107                              <1> 	;mov	[edi+5], bl
  9108                              <1> 	;mov	[edi+6], dx
  9109                              <1> 	;mov	[edi+8], bl
  9110                              <1> 	;mov	[edi+9], dx
  9111                              <1> 	;mov	[edi+11], bl
  9112                              <1> 	;mov	[edi+12], dx
  9113                              <1> 	;mov	[edi+14], bl
  9114                              <1> 	;mov	[edi+15], dx
  9115                              <1> 	;mov	[edi+17], bl
  9116                              <1> 	;mov	[edi+18], dx
  9117                              <1> 	;mov	[edi+20], bl
  9118                              <1> 	;mov	[edi+21], dx
  9119                              <1> 	;mov	[edi+23], bl
  9120 0000FACE E838000000          <1> 	call	sysvideo_15_196_94
  9121                              <1> 		; character pixel/forecolor,
  9122                              <1> 		; 24 bpp (true colors)
  9123                              <1> sysvideo_15_196_89:	
  9124 0000FAD3 83C718              <1> 	add	edi, 24
  9125 0000FAD6 FECC                <1> 	dec	ah
  9126 0000FAD8 75EB                <1> 	jnz	short sysvideo_15_196_88 ; next pixel of (same) row	
  9127 0000FADA 5F                  <1> 	pop	edi
  9128 0000FADB 01EF                <1> 	add	edi, ebp ; next row
  9129 0000FADD FECB                <1> 	dec	bl
  9130 0000FADF 75DF                <1> 	jnz	short sysvideo_15_196_87 ; same pixels for next row
  9131 0000FAE1 46                  <1> 	inc	esi
  9132 0000FAE2 FEC9                <1> 	dec	cl
  9133 0000FAE4 75D8                <1> 	jnz	short sysvideo_15_196_86 ; next row of the character font
  9134 0000FAE6 C3                  <1> 	retn
  9135                              <1> 
  9136                              <1> sysvideo_15_196_91:
  9137                              <1> 	; 02/01/2021
  9138 0000FAE7 89D3                <1> 	mov	ebx, edx
  9139 0000FAE9 C1EB10              <1> 	shr	ebx, 16
  9140 0000FAEC 668917              <1> 	mov	[edi], dx
  9141 0000FAEF 885F02              <1> 	mov	[edi+2], bl
  9142 0000FAF2 C3                  <1> 	retn
  9143                              <1> sysvideo_15_196_92:
  9144 0000FAF3 66895703            <1> 	mov	[edi+3], dx
  9145 0000FAF7 885F05              <1> 	mov	[edi+5], bl
  9146 0000FAFA C3                  <1> 	retn
  9147                              <1> sysvideo_15_196_93:
  9148 0000FAFB 66895706            <1> 	mov	[edi+6], dx
  9149 0000FAFF 885F08              <1> 	mov	[edi+8], bl
  9150 0000FB02 66895709            <1> 	mov	[edi+9], dx
  9151 0000FB06 885F0B              <1> 	mov	[edi+11], bl
  9152 0000FB09 EBE8                <1> 	jmp	short sysvideo_15_196_92
  9153                              <1> sysvideo_15_196_94:
  9154 0000FB0B 6689570C            <1> 	mov	[edi+12], dx
  9155 0000FB0F 885F0E              <1> 	mov	[edi+14], bl
  9156 0000FB12 6689570F            <1> 	mov	[edi+15], dx
  9157 0000FB16 885F11              <1> 	mov	[edi+17], bl
  9158 0000FB19 66895712            <1> 	mov	[edi+18], dx
  9159 0000FB1D 885F14              <1> 	mov	[edi+20], bl
  9160 0000FB20 66895715            <1> 	mov	[edi+21], dx
  9161 0000FB24 885F17              <1> 	mov	[edi+23], bl
  9162 0000FB27 EBD2                <1> 	jmp	short sysvideo_15_196_93
  9163                              <1> 
  9164                              <1> sysvideo_15_200:
  9165                              <1> 	; 29/12/2020
  9166 0000FB29 6639EA              <1> 	cmp	dx, bp ; end column < screen width ?
  9167 0000FB2C 7205                <1> 	jb	short sysvideo_15_201
  9168                              <1> 	; fix bottom right position of the window 
  9169 0000FB2E 6689EA              <1> 	mov	dx, bp
  9170 0000FB31 664A                <1> 	dec	dx
  9171                              <1> sysvideo_15_201:
  9172 0000FB33 C3                  <1> 	retn
  9173                              <1> 
  9174                              <1> sysvideo_15_202:
  9175                              <1> 	; 30/12/2020
  9176 0000FB34 89EB                <1> 	mov	ebx, ebp ; screen width
  9177                              <1> sysvideo_15_203:
  9178 0000FB36 89C8                <1> 	mov	eax, ecx
  9179 0000FB38 C1E810              <1> 	shr	eax, 16  ; top row
  9180 0000FB3B F7E3                <1> 	mul	ebx
  9181 0000FB3D 6689CA              <1> 	mov	dx, cx ; top left column
  9182 0000FB40 01D0                <1> 	add	eax, edx
  9183 0000FB42 C3                  <1> 	retn
  9184                              <1> 
  9185                              <1> sysvideo_15_204:
  9186                              <1> 	; 30/12/2020
  9187 0000FB43 010D[64030300]      <1> 	add	[u.r0], ecx
  9188 0000FB49 01DF                <1> 	add	edi, ebx ; next row
  9189 0000FB4B 01CE                <1> 	add	esi, ecx
  9190 0000FB4D 3B3C24              <1> 	cmp	edi, [esp] ; stop addr (included in loop)
  9191 0000FB50 C3                  <1> 	retn
  9192                              <1> 
  9193                              <1> sysvideo_39:
  9194                              <1> 	; 04/01/2021
  9195                              <1> 	; 03/01/2021
  9196                              <1> 	; 23/11/2020
  9197                              <1> 	; BH = 3
  9198                              <1> 	; PIXEL READ/WRITE
  9199                              <1> 	
  9200                              <1> 	; 04/01/2021 (TRDOS 386 v2.0.3)
  9201 0000FB51 80FB03              <1> 	cmp	bl, 3
  9202 0000FB54 7610                <1> 	jna	short sysvideo_39_1
  9203                              <1> sysvideo_39_0:
  9204                              <1> 	; error
  9205 0000FB56 B3FF                <1> 	mov	bl, 0FFh
  9206 0000FB58 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  9207 0000FB5E 895D10              <1> 	mov	[ebp+16], ebx ; EBX
  9208 0000FB61 E986DDFFFF          <1> 	jmp	sysret
  9209                              <1> sysvideo_39_1:
  9210 0000FB66 803D[BA6F0000]FF    <1> 	cmp	byte [CRT_MODE], 0FFh
  9211 0000FB6D 7312                <1> 	jnb	short sysvideo_39_2 ; SVGA (VESA VBE) video mode
  9212                              <1> 
  9213                              <1> 	; Std VGA or CGA mode
  9214 0000FB6F 81C200000A00        <1> 	add	edx, 0A0000h
  9215 0000FB75 72DF                <1> 	jc	short sysvideo_39_0
  9216 0000FB77 81FAFFFF0A00        <1> 	cmp	edx, 0AFFFFh
  9217 0000FB7D 77D7                <1> 	ja	short sysvideo_39_0
  9218 0000FB7F EB1E                <1> 	jmp	short sysvideo_39_3 ; 8bpp
  9219                              <1> 
  9220                              <1> sysvideo_39_2:
  9221                              <1> 	; use current vbe (svga) video mode
  9222                              <1> 
  9223                              <1> 	; get LFB address
  9224 0000FB81 A1[2C120300]        <1> 	mov	eax, [LFB_ADDR] ; [LFB_Info+LFBINFO.LFB_addr]
  9225 0000FB86 09C0                <1> 	or	eax, eax
  9226 0000FB88 74CC                <1> 	jz	short sysvideo_39_0
  9227 0000FB8A 3B15[30120300]      <1> 	cmp	edx, [LFB_SIZE] 
  9228 0000FB90 73C4                <1> 	jnb	short sysvideo_39_0
  9229                              <1> 
  9230 0000FB92 01C2                <1> 	add	edx, eax
  9231                              <1> 	;jc	short sysvideo_39_0
  9232                              <1> 
  9233                              <1> 	; Pixel read/write in VESA VBE (2/3) video mode
  9234                              <1> 	; Video memory at Linear Frame Buffer base address
  9235                              <1> 
  9236 0000FB94 8A3D[38120300]      <1> 	mov	bh, [LFB_Info+LFBINFO.bpp]
  9237                              <1> 
  9238 0000FB9A 80FF08              <1> 	cmp	bh, 8 ; 8bpp
  9239 0000FB9D 775D                <1> 	ja	short sysvideo_39_17
  9240                              <1> 
  9241                              <1> 	; 8 bits per pixel
  9242                              <1> sysvideo_39_3:
  9243 0000FB9F 80FB01              <1> 	cmp	bl, 1 ; 1 = write pixel
  9244 0000FBA2 7406                <1> 	je	short sysvideo_39_5
  9245 0000FBA4 7712                <1> 	ja	short sysvideo_39_8
  9246                              <1> sysvideo_39_4:
  9247                              <1> 	; read pixel (8bpp)
  9248 0000FBA6 8A02                <1> 	mov	al, [edx]
  9249                              <1> 	;mov	[u.r0], al
  9250                              <1> 	;jmp	sysret
  9251 0000FBA8 EB04                <1> 	jmp	short sysvideo_39_7
  9252                              <1> sysvideo_39_5:
  9253                              <1> 	; write pixel (8bpp)
  9254 0000FBAA 88C8                <1> 	mov	al, cl
  9255                              <1> sysvideo_39_6:
  9256 0000FBAC 8802                <1> 	mov	[edx], al
  9257                              <1> sysvideo_39_7:
  9258 0000FBAE A2[64030300]        <1> 	mov	[u.r0], al
  9259 0000FBB3 E934DDFFFF          <1> 	jmp	sysret
  9260                              <1> sysvideo_39_8:
  9261 0000FBB8 80FB03              <1> 	cmp	bl, 3 ; mix
  9262 0000FBBB 7208                <1> 	jb	short sysvideo_39_9
  9263                              <1> 	; mix  pixel colors (8bpp)
  9264 0000FBBD 8A02                <1> 	mov	al, [edx]
  9265 0000FBBF 00C8                <1> 	add	al, cl
  9266 0000FBC1 D0D8                <1> 	rcr	al, 1
  9267 0000FBC3 EBE7                <1> 	jmp	short sysvideo_39_6
  9268                              <1> sysvideo_39_9:
  9269                              <1> 	 ; swap pixel colors (8bpp)
  9270 0000FBC5 88C8                <1> 	mov	al, cl
  9271 0000FBC7 8602                <1> 	xchg	[edx], al
  9272 0000FBC9 EBE3                <1> 	jmp	short sysvideo_39_7
  9273                              <1> 
  9274                              <1> 	; 16 bits per pixel
  9275                              <1> sysvideo_39_10:
  9276 0000FBCB 80FB01              <1> 	cmp	bl, 1 ; 1 = write pixel
  9277 0000FBCE 7406                <1> 	je	short sysvideo_39_12
  9278 0000FBD0 7714                <1> 	ja	short sysvideo_39_15
  9279                              <1> sysvideo_39_11:
  9280                              <1> 	; read pixel (16bpp)
  9281 0000FBD2 8B02                <1> 	mov	eax, [edx]
  9282                              <1> 	;mov	[u.r0], ax
  9283                              <1> 	;jmp	sysret
  9284 0000FBD4 EB05                <1> 	jmp	short sysvideo_39_14
  9285                              <1> sysvideo_39_12:
  9286                              <1> 	; write pixel (16bpp)
  9287 0000FBD6 89C8                <1> 	mov	eax, ecx
  9288                              <1> sysvideo_39_13:
  9289 0000FBD8 668902              <1> 	mov	[edx], ax
  9290                              <1> sysvideo_39_14:
  9291 0000FBDB 66A3[64030300]      <1> 	mov	[u.r0], ax
  9292 0000FBE1 E906DDFFFF          <1> 	jmp	sysret
  9293                              <1> sysvideo_39_15:
  9294 0000FBE6 80FB03              <1> 	cmp	bl, 3 ; mix
  9295 0000FBE9 720A                <1> 	jb	short sysvideo_39_16
  9296                              <1> 	; mix  pixel colors (16bpp)
  9297 0000FBEB 8B02                <1> 	mov	eax, [edx]
  9298 0000FBED 6601C8              <1> 	add	ax, cx
  9299 0000FBF0 66D1D8              <1> 	rcr	ax, 1
  9300 0000FBF3 EBE3                <1> 	jmp	short sysvideo_39_13
  9301                              <1> sysvideo_39_16:
  9302                              <1> 	 ; swap pixel colors (16bpp)
  9303 0000FBF5 89C8                <1> 	mov	eax, ecx
  9304 0000FBF7 668702              <1> 	xchg	[edx], ax
  9305 0000FBFA EBDF                <1> 	jmp	short sysvideo_39_14
  9306                              <1> sysvideo_39_17:
  9307 0000FBFC 80FF18              <1> 	cmp	bh, 24
  9308 0000FBFF 7743                <1> 	ja	short sysvideo_39_24
  9309 0000FC01 72C8                <1> 	jb	short sysvideo_39_10  
  9310                              <1> 	
  9311                              <1> 	; 24 bits per pixel
  9312 0000FC03 81E1FFFFFF00        <1> 	and	ecx, 0FFFFFFh
  9313 0000FC09 80FB01              <1> 	cmp	bl, 1 ; 1 = write pixel
  9314 0000FC0C 7406                <1> 	je	short sysvideo_39_19
  9315 0000FC0E 7712                <1> 	ja	short sysvideo_39_22
  9316                              <1> sysvideo_39_18:
  9317                              <1> 	; read pixel (24bpp)
  9318 0000FC10 8B02                <1> 	mov	eax, [edx]
  9319                              <1> 	;and	eax, 0FFFFFFh
  9320                              <1> 	;mov	[u.r0], eax
  9321                              <1> 	;jmp	sysret
  9322 0000FC12 EB04                <1> 	jmp	short sysvideo_39_21
  9323                              <1> sysvideo_39_19:
  9324                              <1> 	; write pixel (24bpp)
  9325 0000FC14 89C8                <1> 	mov	eax, ecx
  9326                              <1> sysvideo_39_20:
  9327                              <1> 	;and	eax, 0FFFFFFh
  9328 0000FC16 8902                <1> 	mov	[edx], eax
  9329                              <1> sysvideo_39_21:
  9330 0000FC18 A3[64030300]        <1> 	mov	[u.r0], eax
  9331 0000FC1D E9CADCFFFF          <1> 	jmp	sysret
  9332                              <1> sysvideo_39_22:
  9333 0000FC22 80FB03              <1> 	cmp	bl, 3 ; mix
  9334 0000FC25 720D                <1> 	jb	short sysvideo_39_23
  9335                              <1> 	; mix  pixel colors (24bpp)
  9336 0000FC27 8B02                <1> 	mov	eax, [edx]
  9337 0000FC29 25FFFFFF00          <1> 	and	eax, 0FFFFFFh
  9338                              <1> 	;and	ecx, 0FFFFFFh
  9339 0000FC2E 01C8                <1> 	add	eax, ecx
  9340 0000FC30 D1D8                <1> 	rcr	eax, 1
  9341 0000FC32 EBE2                <1> 	jmp	short sysvideo_39_20
  9342                              <1> sysvideo_39_23:
  9343                              <1> 	 ; swap pixel colors (24bpp)
  9344 0000FC34 89C8                <1> 	mov	eax, ecx
  9345                              <1> 	;and	eax, 0FFFFFFh
  9346 0000FC36 668702              <1> 	xchg	[edx], ax
  9347 0000FC39 C1C810              <1> 	ror	eax, 16
  9348 0000FC3C 884202              <1> 	mov	[edx+2], al	
  9349 0000FC3F C1C010              <1> 	rol	eax, 16
  9350 0000FC42 EBD4                <1> 	jmp	short sysvideo_39_21
  9351                              <1> 
  9352                              <1> 	; 32 bits per pixel
  9353                              <1> sysvideo_39_24:
  9354 0000FC44 80FB01              <1> 	cmp	bl, 1 ; 1 = write pixel
  9355 0000FC47 7406                <1> 	je	short sysvideo_39_26
  9356 0000FC49 7712                <1> 	ja	short sysvideo_39_29
  9357                              <1> sysvideo_39_25:
  9358                              <1> 	; read pixel (32bpp)
  9359 0000FC4B 8B02                <1> 	mov	eax, [edx]
  9360                              <1> 	;mov	[u.r0], eax
  9361                              <1> 	;jmp	sysret
  9362 0000FC4D EB04                <1> 	jmp	short sysvideo_39_28
  9363                              <1> sysvideo_39_26:
  9364                              <1> 	; write pixel (32bpp)
  9365 0000FC4F 89C8                <1> 	mov	eax, ecx
  9366                              <1> sysvideo_39_27:
  9367 0000FC51 8902                <1> 	mov	[edx], eax
  9368                              <1> sysvideo_39_28:
  9369 0000FC53 A3[64030300]        <1> 	mov	[u.r0], eax
  9370 0000FC58 E98FDCFFFF          <1> 	jmp	sysret
  9371                              <1> sysvideo_39_29:
  9372 0000FC5D 80FB03              <1> 	cmp	bl, 3 ; mix
  9373 0000FC60 7208                <1> 	jb	short sysvideo_39_30
  9374                              <1> 	; mix  pixel colors (32bpp)
  9375 0000FC62 8B02                <1> 	mov	eax, [edx]
  9376 0000FC64 01C8                <1> 	add	eax, ecx
  9377 0000FC66 D1D8                <1> 	rcr	eax, 1
  9378 0000FC68 EBE7                <1> 	jmp	short sysvideo_39_27
  9379                              <1> sysvideo_39_30:
  9380                              <1> 	 ; swap pixel colors (32bpp)
  9381 0000FC6A 89C8                <1> 	mov	eax, ecx
  9382 0000FC6C 8702                <1> 	xchg	[edx], eax
  9383 0000FC6E EBE3                <1> 	jmp	short sysvideo_39_28
  9384                              <1> 
  9385                              <1> sysvideo_16:
  9386                              <1> 	; 23/11/2020
  9387 0000FC70 80FF04              <1> 	cmp	bh, 4
  9388 0000FC73 0F82D8FEFFFF        <1> 	jb	sysvideo_39 ; bh = 3, pixel r/w
  9389 0000FC79 7721                <1> 	ja	short sysvideo_17
  9390                              <1> 	
  9391                              <1> 	; BH = 4
  9392                              <1> 	; Direct User Access for CGA video memory.
  9393                              <1> 	; Setup user's page tables for direct access to 0B8000h.
  9394                              <1> 	;
  9395                              <1> 	; Permission checks are not implemented yet !
  9396                              <1> 	; (11/07/2016)
  9397                              <1> 
  9398 0000FC7B B800800B00          <1> 	mov	eax, 0B8000h
  9399 0000FC80 B908000000          <1> 	mov	ecx, 8 ; 8 pages (8*4K=32K)
  9400 0000FC85 89C3                <1> 	mov	ebx, eax ; 12/05/2017 ; virtual = physical
  9401 0000FC87 E8646AFFFF          <1> 	call	direct_memory_access	
  9402 0000FC8C 0F825ADCFFFF        <1> 	jc	sysret
  9403                              <1> 	; eax = 0B8000h if there is not an error
  9404 0000FC92 A3[64030300]        <1> 	mov	[u.r0], eax
  9405 0000FC97 E950DCFFFF          <1> 	jmp	sysret
  9406                              <1> 
  9407                              <1> sysvideo_17:
  9408                              <1> 	; 23/12/2020
  9409                              <1> 	; 11/12/2020
  9410                              <1> 	; 10/12/2020
  9411                              <1> 	; 23/11/2020
  9412 0000FC9C 80FF06              <1> 	cmp	bh, 6
  9413 0000FC9F 740B                <1> 	je	short sysvideo_17_0
  9414 0000FCA1 0F82B9000000        <1> 	jb	sysvideo_18
  9415 0000FCA7 E913010000          <1> 	jmp	sysvideo_20 ; ja
  9416                              <1> 
  9417                              <1> sysvideo_17_0:
  9418                              <1> 	; BH = 6
  9419                              <1> 	; Direct User Access to Linear Frame Buffer.
  9420                              <1> 	; Setup user's page tables for direct access to LFB.
  9421                              <1> 	;
  9422                              <1> 	; Permission checks are not implemented yet !
  9423                              <1> 	; (10/12/2020)
  9424                              <1> 
  9425 0000FCAC 80FBFF              <1> 	cmp	bl, 0FFh ; current video mode
  9426 0000FCAF 722C                <1> 	jb	short sysvideo_17_2 ; for desired video mode
  9427                              <1> 
  9428 0000FCB1 381D[BA6F0000]      <1> 	cmp	[CRT_MODE], bl ; VESA VBE video mode ?
  9429 0000FCB7 750E                <1> 	jne	short sysvideo_17_1
  9430 0000FCB9 668B0D[1E120300]    <1> 	mov	cx, [video_mode]
  9431 0000FCC0 6681E1FF01          <1> 	and	cx, 1FFh
  9432 0000FCC5 EB29                <1> 	jmp	short sysvideo_17_3
  9433                              <1> sysvideo_17_1:
  9434                              <1> 	; 11/12/2020
  9435 0000FCC7 88DF                <1> 	mov	bh, bl ; 0FFh
  9436 0000FCC9 8A1D[BA6F0000]      <1> 	mov	bl, [CRT_MODE] ; VGA/CGA video mode
  9437 0000FCCF 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  9438                              <1> 	; 23/12/2020
  9439 0000FCD5 895D10              <1> 	mov	[ebp+16], ebx ; return to user with EBX value 
  9440 0000FCD8 E90FDCFFFF          <1> 	jmp	sysret ; return to user with EAX = 0
  9441                              <1> sysvideo_17_2:
  9442                              <1> 	; bl = VESA video mode - 100h
  9443 0000FCDD B701                <1> 	mov	bh, 1 ; bx = 1XXh
  9444 0000FCDF 53                  <1> 	push	ebx ; requested vesa video mode
  9445 0000FCE0 E8BC3EFFFF          <1> 	call	vbe_biosfn_return_current_mode
  9446 0000FCE5 59                  <1> 	pop	ecx ; requested vesa video mode
  9447 0000FCE6 6681E3FF01          <1> 	and	bx, 1FFh
  9448 0000FCEB 6639D9              <1> 	cmp	cx, bx
  9449 0000FCEE 7564                <1> 	jne	short sysvideo_17_8
  9450                              <1> sysvideo_17_3:
  9451 0000FCF0 663B0D[2A120300]    <1> 	cmp	cx, [LFB_Info+LFBINFO.mode]
  9452 0000FCF7 755B                <1> 	jne	short sysvideo_17_8
  9453                              <1> sysvideo_17_4:
  9454                              <1> 	; 11/12/2020
  9455 0000FCF9 A1[2C120300]        <1> 	mov	eax, [LFB_Info+LFBINFO.LFB_addr]
  9456                              <1> 	; 21/12/2020
  9457 0000FCFE 09C0                <1> 	or	eax, eax
  9458 0000FD00 744D                <1> 	jz	short sysvideo_17_7
  9459                              <1> 	;
  9460 0000FD02 8B0D[30120300]      <1> 	mov	ecx, [LFB_Info+LFBINFO.LFB_size] ; buff size
  9461 0000FD08 89C3                <1> 	mov 	ebx, eax ; user's address = physical address
  9462                              <1> 	;push	ebx
  9463 0000FD0A 51                  <1> 	push	ecx
  9464                              <1> 	; 21/12/2020
  9465 0000FD0B 81C1FF0F0000        <1> 	add	ecx, 4095  ; PAGESIZE - 1
  9466                              <1> 	; 14/12/2020
  9467 0000FD11 C1E90C              <1> 	shr	ecx, 12  ; convert bytes to pages
  9468 0000FD14 E8D769FFFF          <1> 	call	direct_memory_access
  9469 0000FD19 5A                  <1> 	pop	edx  ; linear frame buffer size in bytes
  9470                              <1> 	;pop	eax  ; linear frame buffer address (physical)
  9471 0000FD1A 7233                <1> 	jc	short sysvideo_17_7 ; [u.r0] = eax = 0
  9472                              <1> sysvideo_17_5:
  9473 0000FD1C 668B0D[36120300]    <1> 	mov	cx, [LFB_Info+LFBINFO.Y_res] ; screen height
  9474 0000FD23 C1E110              <1> 	shl	ecx, 16
  9475 0000FD26 668B0D[34120300]    <1> 	mov	cx,  [LFB_Info+LFBINFO.X_res] ; screen width
  9476 0000FD2D 31DB                <1> 	xor	ebx, ebx
  9477 0000FD2F 8A1D[38120300]      <1> 	mov	bl, [LFB_Info+LFBINFO.bpp] ; bits per pixel
  9478 0000FD35 8A3D[2A120300]      <1> 	mov	bh, [LFB_Info+LFBINFO.mode] ; XX part of 1XXh
  9479                              <1> sysvideo_26_4: ; 23/12/2020	
  9480 0000FD3B 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  9481 0000FD41 895514              <1> 	mov	[ebp+20], edx ; return to user with EDX value 
  9482 0000FD44 895D10              <1> 	mov	[ebp+16], ebx ; EBX
  9483 0000FD47 894D18              <1> 	mov	[ebp+24], ecx ; ECX
  9484                              <1> sysvideo_17_6:
  9485 0000FD4A A3[64030300]        <1> 	mov	[u.r0], eax ; LFB address
  9486                              <1> sysvideo_17_7:
  9487 0000FD4F E998DBFFFF          <1> 	jmp	sysret 
  9488                              <1> sysvideo_17_8:
  9489                              <1> 	; cx = mode
  9490                              <1> 	; 21/12/2020
  9491 0000FD54 80CD40              <1> 	or	ch, 40h  ; Linear frame buffer flag	
  9492 0000FD57 E8673CFFFF          <1> 	call	_vbe_biosfn_return_mode_info
  9493 0000FD5C 72F1                <1> 	jc	short sysvideo_17_7
  9494 0000FD5E EB99                <1> 	jmp	short sysvideo_17_4
  9495                              <1> 	
  9496                              <1> sysvideo_18:
  9497                              <1> 	; BH = 5
  9498                              <1> 	; Direct User Access for VGA video memory.
  9499                              <1> 	; Setup user's page tables for direct access to 0A0000h.
  9500                              <1> 	;
  9501                              <1> 	; Permission checks are not implemented yet !
  9502                              <1> 	; (11/07/2016)
  9503                              <1> 
  9504 0000FD60 B800000A00          <1> 	mov	eax, 0A0000h
  9505 0000FD65 B910000000          <1> 	mov	ecx, 16 ; 16 pages (16*4K=64K)
  9506 0000FD6A 89C3                <1> 	mov	ebx, eax ; 12/05/2017 ; virtual = physical
  9507 0000FD6C E87F69FFFF          <1> 	call	direct_memory_access	
  9508 0000FD71 0F8275DBFFFF        <1> 	jc	sysret
  9509                              <1> 	; eax = 0A0000h if there is not an error
  9510 0000FD77 A3[64030300]        <1> 	mov	[u.r0], eax
  9511 0000FD7C E96BDBFFFF          <1> 	jmp	sysret
  9512                              <1> 
  9513                              <1> sysvideo_19:
  9514                              <1> 	; 22/01/2021
  9515                              <1> 	; 12/12/2020
  9516                              <1> 	; 11/12/2020
  9517                              <1> 	; 23/11/2020
  9518                              <1> 	; BH = 7
  9519                              <1> 	; Get (Super/Extended VGA) mode
  9520                              <1> 	; and Linear Frame Buffer info.
  9521                              <1> 	
  9522                              <1> 	; 22/01/2021
  9523 0000FD81 B3FF                <1> 	mov	bl, 0FFh
  9524                              <1> 	; 11/12/2020
  9525                              <1> 	;cmp	byte [CRT_MODE], 0FFh ; (extended mode?)
  9526                              <1> 	; 22/01/2021
  9527 0000FD83 381D[BA6F0000]      <1> 	cmp	[CRT_MODE], bl  ; 0FFh
  9528                              <1> 	;jb	sysvideo_17_1	; not a VESA VBE mode
  9529                              <1> 	; 12/12/2020
  9530 0000FD89 7305                <1> 	jnb	short sysvideo_19_0
  9531 0000FD8B E937FFFFFF          <1> 	jmp	sysvideo_17_1
  9532                              <1> 
  9533                              <1> sysvideo_19_0:
  9534 0000FD90 E80C3EFFFF          <1> 	call	vbe_biosfn_return_current_mode
  9535 0000FD95 6681E3FF01          <1> 	and	bx, 1FFh
  9536 0000FD9A 663B1D[2A120300]    <1> 	cmp	bx, [LFB_Info+LFBINFO.mode]
  9537 0000FDA1 7510                <1> 	jne	short sysvideo_19_2
  9538                              <1> sysvideo_19_1:
  9539 0000FDA3 A1[2C120300]        <1> 	mov	eax, [LFB_Info+LFBINFO.LFB_addr]
  9540 0000FDA8 8B15[30120300]      <1> 	mov	edx, [LFB_Info+LFBINFO.LFB_size]
  9541 0000FDAE E969FFFFFF          <1> 	jmp	sysvideo_17_5
  9542                              <1> sysvideo_19_2:
  9543 0000FDB3 E80B3CFFFF          <1> 	call	_vbe_biosfn_return_mode_info
  9544 0000FDB8 73E9                <1> 	jnc	short sysvideo_19_1
  9545 0000FDBA E92DDBFFFF          <1> 	jmp	sysret
  9546                              <1> 
  9547                              <1> sysvideo_20:
  9548                              <1> 	; 11/12/2020
  9549                              <1> 	; 23/11/2020
  9550 0000FDBF 80FF08              <1> 	cmp	bh, 8
  9551 0000FDC2 72BD                <1> 	jb	short sysvideo_19 ; video mode & lfb info
  9552 0000FDC4 0F8780000000        <1> 	ja	sysvideo_21 ; 12/12/2020
  9553                              <1> 
  9554                              <1> 	; BH = 8
  9555                              <1> 	; Set (Super/Extended VGA) mode & return LFB info
  9556                              <1> 	;
  9557                              <1> 	
  9558                              <1> 	; 11/12/2020
  9559 0000FDCA 80FBFF              <1> 	cmp	bl, 0FFh  ; CGA/VGA mode ?
  9560 0000FDCD 7318                <1> 	jnb	short sysvideo_20_1
  9561                              <1> 
  9562                              <1> 	;xor	ah, ah
  9563 0000FDCF 88D8                <1> 	mov	al, bl
  9564                              <1> sysvideo_20_0:
  9565 0000FDD1 E89319FFFF          <1> 	call	_int10h  ; uses vbe3 pmi32 option
  9566 0000FDD6 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh ; -1
  9567 0000FDD9 7459                <1> 	je	short sysvideo_20_3 ; error
  9568                              <1> 	
  9569                              <1> 	; 11/12/2020
  9570                              <1> 	; alternative (it does not use vbe3 pmi32)
  9571                              <1> 	;push	eax
  9572                              <1> 	;call	_set_mode
  9573                              <1> 	;pop	eax
  9574                              <1> 	;jc	short sysvideo_20_3
  9575                              <1> 	
  9576                              <1> 	;inc	eax
  9577 0000FDDB FEC0                <1> 	inc	al
  9578                              <1> 	;mov	[u.r0], ax ; video mode + 1	
  9579 0000FDDD A2[64030300]        <1> 	mov	[u.r0], al
  9580 0000FDE2 E905DBFFFF          <1> 	jmp	sysret
  9581                              <1> 
  9582                              <1> sysvideo_20_1:
  9583                              <1> 	; cx = vesa video mode
  9584 0000FDE7 6689C8              <1> 	mov	ax, cx
  9585 0000FDEA 663D0001            <1> 	cmp	ax, 100h
  9586 0000FDEE 72E1                <1> 	jb	short sysvideo_20_0 ; VGA/CGA mode
  9587 0000FDF0 663DFF01            <1> 	cmp	ax, 1FFh
  9588                              <1> 	;ja	short sysvideo_20_4 ; not valid
  9589 0000FDF4 773E                <1> 	ja	short sysvideo_20_3
  9590 0000FDF6 50                  <1> 	push	eax
  9591 0000FDF7 6689C3              <1> 	mov	bx, ax
  9592 0000FDFA 66B8024F            <1> 	mov	ax, 4F02h
  9593                              <1> 
  9594                              <1> 	; simulate _int10h (int 31h) for func 4F02h
  9595                              <1> 	;pushfd
  9596                              <1> 	;push	cs
  9597                              <1> 	;push	sysvideo_20_1_retn 
  9598                              <1> 	;push	es ; *
  9599                              <1> 	;push	ds ; **	; SAVE WORK AND PARAMETER REGISTERS
  9600                              <1> 	;jmp	VBE_func
  9601                              <1> ;sysvideo_20_1_retn:	
  9602                              <1> 	
  9603 0000FDFE E86619FFFF          <1> 	call	_int10h ; simulate int 10h (int 31h)
  9604                              <1> 
  9605 0000FE03 6683F84F            <1> 	cmp	ax, 004Fh
  9606 0000FE07 58                  <1> 	pop	eax
  9607 0000FE08 752A                <1> 	jne	short sysvideo_20_3 ; error
  9608                              <1> 	;pop	eax
  9609 0000FE0A 40                  <1> 	inc	eax
  9610 0000FE0B A3[64030300]        <1> 	mov	[u.r0], eax ; video mode + 1
  9611 0000FE10 09D2                <1> 	or	edx, edx ; is LFBINFO requested by user ?	
  9612                              <1> 	;jz	short sysvideo_20_4
  9613 0000FE12 7420                <1> 	jz	short sysvideo_20_3 ; no
  9614                              <1> 
  9615                              <1> 	; 11/12/2020
  9616                              <1> 	; Check LFBINFO table/structure
  9617                              <1> 	; (it is set by vbe2 'vbe_biosfn_set_mode'
  9618                              <1> 	; but if vbe3 vbios pmi is in use,
  9619                              <1> 	; it will not set LFBINFO table)
  9620                              <1> 
  9621 0000FE14 52                  <1> 	push	edx
  9622 0000FE15 48                  <1> 	dec	eax  ; video mode
  9623 0000FE16 BE[2A120300]        <1> 	mov	esi, LFB_Info
  9624 0000FE1B 663B06              <1> 	cmp	ax, [esi+LFBINFO.mode]
  9625 0000FE1E 7407                <1> 	je	short sysvideo_20_2
  9626                              <1> 
  9627 0000FE20 E89E3BFFFF          <1> 	call	_vbe_biosfn_return_mode_info
  9628                              <1> 	;jnc	short sysvideo_20_2
  9629 0000FE25 7212                <1> 	jc	short sysvideo_20_4 ; edx = 0	
  9630                              <1> 
  9631                              <1> 	;; clear LFBINFO table for invalidating	
  9632                              <1> 	;mov	ecx, LFBINFO.size ; 16
  9633                              <1> 	;mov	edi, esi ; LFB_Info table address
  9634                              <1> 	;xor	eax, eax
  9635                              <1> 	;rep	stosb
  9636                              <1> 
  9637                              <1> sysvideo_20_2:
  9638                              <1> 	;pop	ecx
  9639                              <1> 	;mov	edi, ecx ; user buffer
  9640 0000FE27 5F                  <1> 	pop	edi
  9641 0000FE28 B910000000          <1> 	mov	ecx, LFBINFO.size ; 16
  9642 0000FE2D E892140000          <1> 	call	transfer_to_user_buffer ; fast transfer
  9643 0000FE32 7206                <1> 	jc	short sysvideo_20_5
  9644                              <1> 	
  9645                              <1> 	;jmp	sysret
  9646                              <1> sysvideo_20_3:	
  9647                              <1> 	;pop	eax ; [u.r0] = 0		
  9648                              <1> ;sysvideo_20_4:
  9649 0000FE34 E9B3DAFFFF          <1> 	jmp	sysret
  9650                              <1> 
  9651                              <1> sysvideo_20_4:
  9652 0000FE39 5A                  <1> 	pop	edx
  9653                              <1> sysvideo_20_5:
  9654 0000FE3A 31D2                <1> 	xor	edx, edx ; 0
  9655                              <1> 	; edx = 0 -> invalid LFBINFO data
  9656 0000FE3C 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  9657 0000FE42 895514              <1> 	mov	[ebp+20], edx ; return to user with EDX value 
  9658 0000FE45 E9A2DAFFFF          <1> 	jmp	sysret
  9659                              <1> 
  9660                              <1> sysvideo_21:
  9661                              <1> 	; 04/01/2021
  9662                              <1> 	; 03/12/2020
  9663 0000FE4A 80FF0A              <1> 	cmp	bh, 10
  9664 0000FE4D 0F82A8010000        <1> 	jb	sysvideo_22 ; VESA VBE3 pmi parms
  9665                              <1> 	; 23/12/2020
  9666 0000FE53 0F8432020000        <1> 	je	sysvideo_26 ; Video memory mapping	
  9667                              <1> 	
  9668                              <1> 	; 04/01/2020
  9669 0000FE59 80FF0B              <1> 	cmp	bh, 11
  9670 0000FE5C 0F87B4020000        <1> 	ja	sysvideo_27
  9671                              <1> 		
  9672                              <1> 	; BH = 11
  9673                              <1> 	; set/read DAC color registers (for 8bpp)
  9674                              <1> 	
  9675 0000FE62 80FB04              <1> 	cmp	bl, 4
  9676 0000FE65 0F83AB000000        <1> 	jnb	sysvideo_21_7	; BMP file type palette
  9677                              <1> 				; handling	
  9678 0000FE6B F6C301              <1> 	test	bl, 1
  9679 0000FE6E 7555                <1> 	jnz	short sysvideo_21_4 ; set/write DAC colors
  9680                              <1> 		
  9681                              <1> 	; Read DAC color register or all DAC color registers
  9682 0000FE70 F6C302              <1> 	test	bl, 2  ; read single DAC color register
  9683 0000FE73 7424                <1> 	jz	short sysvideo_21_2 ; read all DAC color regs	
  9684                              <1> 
  9685                              <1> 	; read single DAC color register
  9686                              <1> 	; CL = DAC color register (index)
  9687                              <1>  	
  9688 0000FE75 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  9689 0000FE79 88C8                <1> 	mov	al, cl	; DAC color register
  9690 0000FE7B 31C9                <1> 	xor	ecx, ecx ; (this may not be necessary)
  9691 0000FE7D EE                  <1> 	out	dx, al
  9692                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  9693 0000FE7E B2C9                <1> 	mov	dl, 0C9h
  9694 0000FE80 EC                  <1> 	in	al, dx
  9695 0000FE81 88C4                <1> 	mov	ah, al	; red
  9696 0000FE83 EC                  <1> 	in	al, dx
  9697 0000FE84 88C1                <1> 	mov	cl, al	; green
  9698 0000FE86 EC                  <1> 	in	al, dx
  9699 0000FE87 88C5                <1> 	mov	ch, al	; blue
  9700 0000FE89 C1E108              <1> 	shl	ecx, 8
  9701 0000FE8C 88E1                <1> 	mov	cl, ah	; red	
  9702                              <1> 	; CL = Red, CH = Green, byte 3 = Blue, byte 4 = 0
  9703                              <1> sysvideo_21_0:
  9704 0000FE8E 890D[64030300]      <1> 	mov	[u.r0], ecx
  9705                              <1> sysvideo_21_1:
  9706 0000FE94 E953DAFFFF          <1> 	jmp	sysret
  9707                              <1> sysvideo_21_2:
  9708                              <1> 	; read all DAC color registers
  9709 0000FE99 89CB                <1> 	mov	ebx, ecx ; user's buffer address
  9710 0000FE9B BF00600900          <1> 	mov	edi, VBE3STACKADDR
  9711 0000FEA0 89FE                <1> 	mov	esi, edi
  9712 0000FEA2 B900030000          <1> 	mov	ecx, 768 ; 256*3
  9713 0000FEA7 51                  <1> 	push	ecx
  9714 0000FEA8 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  9715 0000FEAC 28C0                <1> 	sub	al, al ; 0
  9716 0000FEAE EE                  <1> 	out	dx, al
  9717                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  9718 0000FEAF B2C9                <1> 	mov	dl, 0C9h
  9719                              <1> sysvideo_21_3:
  9720 0000FEB1 EC                  <1> 	in	al, dx
  9721 0000FEB2 AA                  <1> 	stosb
  9722 0000FEB3 EC                  <1> 	in	al, dx
  9723 0000FEB4 AA                  <1> 	stosb
  9724 0000FEB5 EC                  <1> 	in	al, dx
  9725 0000FEB6 AA                  <1> 	stosb
  9726 0000FEB7 E2F8                <1> 	loop	sysvideo_21_3
  9727 0000FEB9 59                  <1> 	pop	ecx
  9728                              <1> 
  9729 0000FEBA 89DF                <1> 	mov	edi, ebx ; user's buffer address
  9730                              <1> 	;mov	esi, VBE3STACKADDR
  9731                              <1> 	;mov	ecx, 256*3 = 768
  9732 0000FEBC E803140000          <1> 	call	transfer_to_user_buffer
  9733 0000FEC1 72D1                <1> 	jc	short sysvideo_21_1
  9734                              <1> 	;mov	[u.r0], ecx ; actual transfer count
  9735 0000FEC3 EBC9                <1> 	jmp	short sysvideo_21_0
  9736                              <1> 
  9737                              <1> sysvideo_21_4:
  9738                              <1> 	; Set/Write DAC color register or all registers
  9739 0000FEC5 F6C302              <1> 	test	bl, 2 ; write/set single DAC color register
  9740 0000FEC8 741C                <1> 	jz	short sysvideo_21_5 ; set all DAC color regs
  9741                              <1> 
  9742                              <1> 	; set single DAC color register
  9743                              <1> 	; CL = DAC color register (index)
  9744                              <1> 	; (byte 1 = Red, byte 2 = Green, byte 3 = Blue) 
  9745                              <1> 
  9746 0000FECA 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  9747 0000FECE 89C8                <1> 	mov	eax, ecx ; DAC color register (index)
  9748 0000FED0 C1E910              <1> 	shr	ecx, 16  ; cl = green, AH = Red
  9749 0000FED3 EE                  <1> 	out	dx, al
  9750                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  9751 0000FED4 FEC2                <1> 	inc	dl
  9752 0000FED6 88E0                <1> 	mov	al, ah	; Red
  9753 0000FED8 EE                  <1> 	out	dx, al
  9754 0000FED9 88C8                <1> 	mov	al, cl	; Green
  9755 0000FEDB EE                  <1> 	out	dx, al
  9756 0000FEDC 88E8                <1> 	mov	al, ch	; Blue
  9757 0000FEDE EE                  <1> 	out	dx, al	
  9758 0000FEDF C1C108              <1> 	rol	ecx, 8
  9759 0000FEE2 88E1                <1> 	mov	cl, ah	; Red
  9760                              <1> 		; ecx = 00BBGGRRh	
  9761 0000FEE4 EBA8                <1> 	jmp	short sysvideo_21_0
  9762                              <1> 
  9763                              <1> sysvideo_21_5:
  9764                              <1> 	; write/set all DAC color registers
  9765 0000FEE6 89CE                <1> 	mov	esi, ecx ; user's buffer address
  9766 0000FEE8 BF00600900          <1> 	mov	edi, VBE3STACKADDR
  9767 0000FEED 89FB                <1> 	mov	ebx, edi
  9768 0000FEEF B900030000          <1> 	mov	ecx, 768 ; 256*3
  9769 0000FEF4 E815140000          <1> 	call	transfer_from_user_buffer
  9770 0000FEF9 7299                <1> 	jc	short sysvideo_21_1
  9771 0000FEFB 890D[64030300]      <1> 	mov	[u.r0], ecx ; actual transfer count
  9772                              <1> 
  9773 0000FF01 89DE                <1> 	mov	esi, ebx ; VBE3STACKADDR
  9774 0000FF03 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  9775 0000FF07 28C0                <1> 	sub	al, al ; 0
  9776 0000FF09 EE                  <1> 	out	dx, al
  9777                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  9778 0000FF0A FEC2                <1> 	inc	dl
  9779                              <1> sysvideo_21_6:
  9780 0000FF0C AC                  <1> 	lodsb
  9781 0000FF0D EE                  <1> 	out	dx, al
  9782 0000FF0E AC                  <1> 	lodsb
  9783 0000FF0F EE                  <1> 	out	dx, al
  9784 0000FF10 AC                  <1> 	lodsb
  9785 0000FF11 EE                  <1> 	out	dx, al
  9786 0000FF12 E2F8                <1> 	loop	sysvideo_21_6
  9787 0000FF14 EB33                <1> 	jmp	short sysvideo_21_9
  9788                              <1> 
  9789                              <1> sysvideo_21_7:	
  9790                              <1> 	; BMP file type palette handling	
  9791                              <1> 	
  9792 0000FF16 F6C301              <1> 	test	bl, 1
  9793 0000FF19 7571                <1> 	jnz	short sysvideo_21_12 ; set/write DAC colors
  9794                              <1> 		
  9795                              <1> 	; Read DAC color register or all DAC color registers
  9796 0000FF1B F6C302              <1> 	test	bl, 2  ; read single DAC color register
  9797 0000FF1E 742E                <1> 	jz	short sysvideo_21_10 ; read all DAC color regs	
  9798                              <1> 
  9799                              <1> 	; read single DAC color register
  9800                              <1> 	; CL = DAC color register (index)
  9801                              <1>  	
  9802 0000FF20 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  9803 0000FF24 88C8                <1> 	mov	al, cl	; DAC color register
  9804 0000FF26 31C9                <1> 	xor	ecx, ecx
  9805 0000FF28 EE                  <1> 	out	dx, al
  9806                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  9807 0000FF29 B2C9                <1> 	mov	dl, 0C9h
  9808 0000FF2B EC                  <1> 	in	al, dx
  9809 0000FF2C C0E002              <1> 	shl	al, 2
  9810 0000FF2F 88C5                <1> 	mov	ch, al	; red
  9811 0000FF31 EC                  <1> 	in	al, dx
  9812 0000FF32 C0E002              <1> 	shl	al, 2
  9813 0000FF35 88C1                <1> 	mov	cl, al	; green
  9814 0000FF37 EC                  <1> 	in	al, dx
  9815 0000FF38 C1E108              <1> 	shl	ecx, 8
  9816 0000FF3B C0E002              <1> 	shl	al, 2
  9817 0000FF3E 88C1                <1> 	mov	cl, al	; blue
  9818 0000FF40 C1C910              <1> 	ror	ecx, 16
  9819                              <1> 	; CL = Blue, CH = Green, byte 3 = Red, byte 4 = 0
  9820                              <1> sysvideo_21_8:
  9821 0000FF43 890D[64030300]      <1> 	mov	[u.r0], ecx
  9822                              <1> sysvideo_21_9:
  9823 0000FF49 E99ED9FFFF          <1> 	jmp	sysret
  9824                              <1> sysvideo_21_10:
  9825                              <1> 	; read all DAC color registers
  9826 0000FF4E 89CD                <1> 	mov	ebp, ecx ; user's buffer address
  9827 0000FF50 BF00600900          <1> 	mov	edi, VBE3STACKADDR
  9828 0000FF55 89FE                <1> 	mov	esi, edi
  9829 0000FF57 B900040000          <1> 	mov	ecx, 1024 ; 256*4
  9830 0000FF5C 51                  <1> 	push	ecx
  9831 0000FF5D 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  9832 0000FF61 28C0                <1> 	sub	al, al ; 0
  9833 0000FF63 EE                  <1> 	out	dx, al
  9834                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  9835 0000FF64 B2C9                <1> 	mov	dl, 0C9h
  9836                              <1> sysvideo_21_11:
  9837 0000FF66 31DB                <1> 	xor	ebx, ebx
  9838 0000FF68 EC                  <1> 	in	al, dx	; Red
  9839 0000FF69 C0E002              <1> 	shl	al, 2
  9840 0000FF6C 88C7                <1> 	mov	bh, al
  9841 0000FF6E EC                  <1> 	in	al, dx	; Green
  9842 0000FF6F C0E002              <1> 	shl	al, 2
  9843 0000FF72 88C3                <1> 	mov	bl, al
  9844 0000FF74 EC                  <1> 	in	al, dx	; Blue
  9845 0000FF75 C0E002              <1> 	shl	al, 2
  9846 0000FF78 C1E308              <1> 	shl	ebx, 8
  9847 0000FF7B 89D8                <1> 	mov	eax, ebx ; 00RRGGBBh
  9848 0000FF7D AB                  <1> 	stosd	
  9849 0000FF7E E2E6                <1> 	loop	sysvideo_21_11
  9850 0000FF80 59                  <1> 	pop	ecx
  9851                              <1> 
  9852 0000FF81 89EF                <1> 	mov	edi, ebp ; user's buffer address
  9853                              <1> 	;mov	esi, VBE3STACKADDR
  9854                              <1> 	;mov	ecx, 1024 = 4*256
  9855 0000FF83 E83C130000          <1> 	call	transfer_to_user_buffer
  9856 0000FF88 72BF                <1> 	jc	short sysvideo_21_9
  9857                              <1> 	;mov	[u.r0], ecx ; actual transfer count
  9858 0000FF8A EBB7                <1> 	jmp	short sysvideo_21_8
  9859                              <1> 
  9860                              <1> sysvideo_21_12:
  9861                              <1> 	; Set/Write DAC color register or all registers
  9862 0000FF8C F6C302              <1> 	test	bl, 2 ; write/set single DAC color register
  9863 0000FF8F 7427                <1> 	jz	short sysvideo_21_13 ; set all DAC color regs
  9864                              <1> 
  9865                              <1> 	; set single DAC color register
  9866                              <1> 	; CL = DAC color register (index)
  9867                              <1> 	; (byte 1 = Blue, byte 2 = Green, byte 3 = Red) 
  9868                              <1> 
  9869 0000FF91 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  9870 0000FF95 88C8                <1> 	mov	al, cl	; DAC color register (index)
  9871 0000FF97 88EC                <1> 	mov	ah, ch ; Blue 
  9872 0000FF99 C1E910              <1> 	shr	ecx, 16
  9873 0000FF9C EE                  <1> 	out	dx, al
  9874                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  9875 0000FF9D FEC2                <1> 	inc	dl
  9876 0000FF9F 88E8                <1> 	mov	al, ch	; Red
  9877 0000FFA1 C0E802              <1> 	shr	al, 2
  9878 0000FFA4 EE                  <1> 	out	dx, al
  9879 0000FFA5 88C8                <1> 	mov	al, cl	; Green
  9880 0000FFA7 C0E802              <1> 	shr	al, 2
  9881 0000FFAA EE                  <1> 	out	dx, al
  9882 0000FFAB 88E0                <1> 	mov	al, ah	; Blue
  9883 0000FFAD C0E802              <1> 	shr	al, 2
  9884 0000FFB0 EE                  <1> 	out	dx, al	
  9885 0000FFB1 C1C108              <1> 	rol	ecx, 8
  9886 0000FFB4 88E1                <1> 	mov	cl, ah
  9887 0000FFB6 EB8B                <1> 	jmp	short sysvideo_21_8
  9888                              <1> 
  9889                              <1> sysvideo_21_13:
  9890                              <1> 	; write/set all DAC color registers
  9891 0000FFB8 89CE                <1> 	mov	esi, ecx ; user's buffer address
  9892 0000FFBA BF00600900          <1> 	mov	edi, VBE3STACKADDR
  9893 0000FFBF 89FB                <1> 	mov	ebx, edi
  9894 0000FFC1 B900040000          <1> 	mov	ecx, 1024 ; 256*4
  9895 0000FFC6 E843130000          <1> 	call	transfer_from_user_buffer
  9896 0000FFCB 7229                <1> 	jc	short sysvideo_21_15
  9897 0000FFCD 890D[64030300]      <1> 	mov	[u.r0], ecx ; actual transfer count
  9898                              <1> 
  9899 0000FFD3 89DE                <1> 	mov	esi, ebx ; VBE3STACKADDR
  9900 0000FFD5 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  9901 0000FFD9 28C0                <1> 	sub	al, al ; 0
  9902 0000FFDB EE                  <1> 	out	dx, al
  9903                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  9904 0000FFDC FEC2                <1> 	inc	dl
  9905                              <1> sysvideo_21_14:
  9906 0000FFDE AD                  <1> 	lodsd
  9907                              <1> 	; byte 0 = Blue, byte 1 = Green, byte 2 = Red
  9908 0000FFDF 89C1                <1> 	mov	ecx, eax
  9909 0000FFE1 C1E010              <1> 	shl	eax, 16 ; byte 0 = Red
  9910 0000FFE4 C0E802              <1> 	shr	al, 2
  9911 0000FFE7 EE                  <1> 	out	dx, al ; Red
  9912 0000FFE8 88E8                <1> 	mov	al, ch
  9913 0000FFEA C0E802              <1> 	shr	al, 2	
  9914 0000FFED EE                  <1> 	out	dx, al ; Green
  9915 0000FFEE 88C8                <1> 	mov	al, cl
  9916 0000FFF0 C0E802              <1> 	shr	al, 2
  9917 0000FFF3 EE                  <1> 	out	dx, al ; Blue 
  9918 0000FFF4 E2E8                <1> 	loop	sysvideo_21_14
  9919                              <1> sysvideo_21_15:
  9920 0000FFF6 E9F1D8FFFF          <1> 	jmp	sysret
  9921                              <1> 
  9922                              <1> sysvideo_22:
  9923                              <1> 	; 22/01/2021
  9924                              <1> 	; 17/01/2021
  9925                              <1> 	; 04/12/2020
  9926                              <1> 	; 03/12/2020
  9927                              <1> 	; BH = 9
  9928                              <1> 	; Set/Get VESA VBE3 protected mode interface params
  9929                              <1> 
  9930                              <1> 	; 22/01/2021
  9931                              <1> 	;cmp	byte [vbe3], 3
  9932                              <1> 	;jne	short sysvideo_25 ; not applicable if
  9933                              <1> 				; vbe3 compatible video bios
  9934                              <1> 				; is not detected by kernel	
  9935 0000FFFB 80FB02              <1> 	cmp	bl, 2
  9936                              <1> 	;ja	short sysvideo_25 ; bl > 2 not implemented
  9937                              <1> 	; 17/01/2021
  9938 0000FFFE 7716                <1> 	ja	short sysvideo_22_0 ; srvs flag sub function
  9939                              <1> 	;jb	short sysvideo_23
  9940                              <1> 
  9941                              <1> 	; 21/01/2021
  9942 00010000 803D[54090000]03    <1> 	cmp	byte [vbe3], 3
  9943 00010007 757D                <1> 	jne	short sysvideo_25 ; not applicable if
  9944                              <1> 				; vbe3 compatible video bios
  9945                              <1> 				; is not detected by kernel
  9946 00010009 80FB01              <1> 	cmp	bl, 1
  9947 0001000C 7663                <1> 	jna	short sysvideo_23
  9948                              <1> 
  9949 0001000E 8A1D[1C120300]      <1> 	mov	bl, [pmi32] ; Video bios 32 bit PMI functions
  9950 00010014 EB68                <1> 	jmp	short sysvideo_24
  9951                              <1> 
  9952                              <1> sysvideo_22_0:
  9953                              <1> 	; 17/01/2021
  9954                              <1> 	; save/restore video state user permission
  9955 00010016 80FB05              <1> 	cmp	bl, 5
  9956 00010019 771E                <1> 	ja	short sysvideo_22_2
  9957 0001001B 7208                <1> 	jb	short sysvideo_22_1
  9958                              <1> 	; get srvs flag value/status
  9959 0001001D 8A1D[84120300]      <1> 	mov	bl, [srvsf] ; 0 = disabled, 1 = enabled
  9960 00010023 EB2C                <1> 	jmp	short sysvideo_22_3
  9961                              <1> 
  9962                              <1> sysvideo_22_1:
  9963                              <1> 	; permission (root and multi tasking) check
  9964 00010025 E836000000          <1> 	call	sysvideo_22_4
  9965 0001002A 735A                <1> 	jnc	short sysvideo_25 ; not permitted !
  9966                              <1> 	; cf = 1
  9967 0001002C 80EB03              <1> 	sub	bl, 3 ; disable = 0, enable = 1
  9968                              <1> 	; 22/01/2021
  9969 0001002F 881D[84120300]      <1> 	mov	[srvsf], bl
  9970 00010035 FEC3                <1> 	inc	bl ; 1 = disabled, 2 = enabled
  9971 00010037 EB18                <1> 	jmp	short sysvideo_22_3
  9972                              <1> 
  9973                              <1> sysvideo_22_2:
  9974 00010039 80FB06              <1> 	cmp	bl, 6
  9975 0001003C 7748                <1> 	ja	short sysvideo_25 ; invalid/unimplemented
  9976                              <1> 	; get VESA VBE number/status
  9977 0001003E 8A25[54090000]      <1> 	mov	ah, [vbe3] ; vbe3 = 3, vbe2 = 2, others = 0
  9978 00010044 A0[55090000]        <1> 	mov	al, [vbe2bios] ; bochs/qemu/vbox emulator status
  9979 00010049 66A3[64030300]      <1> 	mov	[u.r0], ax
  9980 0001004F EB35                <1> 	jmp	short sysvideo_25
  9981                              <1> 
  9982                              <1> sysvideo_22_3:
  9983                              <1> 	; 22/01/2021
  9984 00010051 8A3D[85120300]      <1> 	mov	bh, [srvso] ; state options (> 80h -> svga)
  9985 00010057 66891D[64030300]    <1> 	mov	[u.r0], bx ; function result is return value 
  9986 0001005E EB26                <1> 	jmp	short sysvideo_25 
  9987                              <1> 
  9988                              <1> sysvideo_22_4:
  9989                              <1> 	; 17/01/2021 - permission will be given by root only
  9990 00010060 803D[228E0100]00    <1> 	cmp	byte [multi_tasking], 0 ; in single user mode
  9991 00010067 7707                <1> 	ja	short sysvideo_22_5
  9992                              <1> 	; 19/01/2021
  9993 00010069 803D[B0030300]01    <1>  	cmp	byte [u.uid], 1 ; ([u.uid] = 0 -> root)
  9994                              <1> sysvideo_22_5:
  9995                              <1> 	; [multi_tasking] = 0 & [u.uid] = 0  -> CF = 1
  9996                              <1> 	; otherwise -> CF = 0 
  9997 00010070 C3                  <1> 	retn
  9998                              <1> 
  9999                              <1> sysvideo_23:
 10000                              <1> 	; 17/01/2021
 10001                              <1> 	; permission (root and multi tasking) check
 10002 00010071 E8EAFFFFFF          <1> 	call	sysvideo_22_4
 10003 00010076 730E                <1> 	jnc	short sysvideo_25 ; not permitted !
 10004                              <1> 
 10005 00010078 881D[1C120300]      <1> 	mov	[pmi32], bl ; 1 = enabled, 0 = disabled 
 10006                              <1> sysvideo_24:
 10007 0001007E FEC3                <1> 	inc	bl
 10008 00010080 881D[64030300]      <1> 	mov	[u.r0], bl ; function result is return value 
 10009                              <1> sysvideo_25:
 10010 00010086 E961D8FFFF          <1> 	jmp	sysret	
 10011                              <1> 
 10012                              <1> sysvideo_26:
 10013                              <1> 	; 23/12/2020
 10014                              <1> 	; BH = 10
 10015                              <1> 	; Map video memory to user's buffer
 10016                              <1> 	; (multiuser/owner r/w permisions are ignored
 10017                              <1> 	;  for current TRDOS 386 version !)
 10018                              <1> 
 10019 0001008B 6681E100F0          <1> 	and	cx, ~4095  ; clear low 12 bits
 10020 00010090 09C9                <1> 	or	ecx, ecx ; start address of user's buffer
 10021 00010092 74F2                <1> 	jz	short sysvideo_25 ; error !
 10022                              <1> 	
 10023 00010094 80FB01              <1> 	cmp	bl, 1  ; VGA memory mapping ?
 10024 00010097 740E                <1> 	je	short sysvideo_26_1
 10025 00010099 7718                <1> 	ja	short sysvideo_26_2
 10026                              <1> sysvideo_26_0:
 10027                              <1> 	; BL = 0 : CGA memory (0B8000h) map (32K)
 10028 0001009B B800800B00          <1> 	mov	eax, 0B8000h	
 10029 000100A0 BB00800000          <1> 	mov	ebx, 32768
 10030 000100A5 EB37                <1> 	jmp	short sysvideo_26_3
 10031                              <1> sysvideo_26_1:
 10032                              <1> 	; BL = 1 : VGA memory (0A0000h) map (64K)
 10033 000100A7 B800000A00          <1> 	mov	eax, 0A0000h	
 10034 000100AC BB00000100          <1> 	mov	ebx, 65536
 10035 000100B1 EB2B                <1> 	jmp	short sysvideo_26_3
 10036                              <1> sysvideo_26_2:
 10037                              <1> 	; BL = 2 : SVGA memory (LFB) map to user's buffer
 10038 000100B3 803D[54090000]02    <1> 	cmp	byte [vbe3], 2  ; VESA VBE 2/3 vbios ready ?
 10039 000100BA 72CA                <1> 	jb	short sysvideo_25  ; no, error !
 10040 000100BC 6681E200F0          <1> 	and	dx, ~4095 ; clear low 12 bits
 10041 000100C1 09D2                <1> 	or	edx, edx  ; buffer size in bytes	
 10042 000100C3 74C1                <1> 	jz	short sysvideo_25  ; error
 10043 000100C5 89D3                <1> 	mov	ebx, edx
 10044 000100C7 A1[2C120300]        <1> 	mov	eax, [LFB_ADDR] ; [LFB_Info+LFBINFO.LFB_addr]
 10045 000100CC 21C0                <1> 	and	eax, eax
 10046 000100CE 7425                <1> 	jz	short sysvideo_26_5
 10047                              <1> 				; (LFB parms are not set yet)
 10048 000100D0 3B1D[30120300]      <1> 	cmp	ebx, [LFB_SIZE] ; [LFB_Info+LFBINFO.LFB_size]
 10049 000100D6 7606                <1> 	jna	short sysvideo_26_3
 10050 000100D8 8B1D[30120300]      <1> 	mov	ebx, [LFB_SIZE]
 10051                              <1> sysvideo_26_3: 
 10052 000100DE 52                  <1> 	push	edx
 10053 000100DF 53                  <1> 	push	ebx	; buffer size in bytes
 10054 000100E0 51                  <1> 	push	ecx	; user's buffer address
 10055 000100E1 87D9                <1> 	xchg	ebx, ecx
 10056 000100E3 C1E90C              <1> 	shr	ecx, 12 ; convert buffer size to page count
 10057 000100E6 E80566FFFF          <1> 	call	direct_memory_access
 10058 000100EB 59                  <1> 	pop	ecx	; user's buffer address
 10059 000100EC 5B                  <1> 	pop	ebx	; buffer size
 10060 000100ED 5A                  <1> 	pop	edx
 10061 000100EE 7296                <1> 	jc	short sysvideo_25 ; error !
 10062                              <1> 				  ; [u.r0] = 0
 10063                              <1> ;sysvideo_26_4:
 10064                              <1> 	;mov	ebp, [u.usp] ; ebp points to user's registers
 10065                              <1> 	;mov	[ebp+20], edx ; return to user with EDX value 
 10066                              <1> 	;mov	[ebp+16], ebx ; EBX
 10067                              <1> 	;mov	[ebp+24], ecx ; ECX
 10068                              <1> 	; eax = physical address of video memory (LFB)
 10069                              <1> 	;mov	[u.r0], eax
 10070                              <1> 	;jmp	sysret
 10071 000100F0 E946FCFFFF          <1> 	jmp	sysvideo_26_4
 10072                              <1> 
 10073                              <1> sysvideo_26_5:
 10074 000100F5 66A1[E30E0000]      <1> 	mov	ax, [def_LFB_addr] ; default LFB for mode 118h
 10075                              <1> 	; ah must be 0C0h or 0D0h or E0h
 10076                              <1> 	; others are nonsence !?
 10077 000100FB 08E4                <1>  	or	ah, ah
 10078 000100FD 7487                <1> 	jz	short sysvideo_25 ; invalid lfb addr or
 10079                              <1> 			  	; it is not a vbe2 -bochs emu- 
 10080                              <1> 			  	; or vbe3 -real- video bios 
 10081 000100FF 80FCF0              <1> 	cmp	ah, 0F0h  
 10082 00010102 7382                <1> 	jnb	short sysvideo_25 ; nonsence !?
 10083 00010104 C1E010              <1> 	shl	eax, 16
 10084                              <1> 	;jz	short sysvideo_25 ; eax = 0 
 10085                              <1> 
 10086 00010107 81FB00907E00        <1> 	cmp	ebx, 1920*1080*4 ; maximum value of possible
 10087                              <1> 				 ; buffer sizes
 10088 0001010D 76CF                <1> 	jna	short sysvideo_26_3  ; buffer size is proper
 10089                              <1> 	; resize buffer to fit 4GB limit
 10090 0001010F BB00907E00          <1> 	mov	ebx, 1920*1080*4
 10091 00010114 EBC8                <1> 	jmp	short sysvideo_26_3
 10092                              <1> 
 10093                              <1> sysvideo_27:
 10094                              <1> 	; 18/01/2021
 10095 00010116 80FF0C              <1> 	cmp	bh, 12
 10096 00010119 0F877E010000        <1> 	ja	sysvideo_28 ; 19/01/2021
 10097                              <1> 
 10098                              <1> 	; BH = 12
 10099                              <1> 	; Font sub functions.
 10100                              <1> 	; 11/01/2021
 10101                              <1> 	; 10/01/2021
 10102                              <1> 	;   BL = 0 : Disable system font overwrite
 10103                              <1> 	;   BL = 1 : Enable system font overwrite
 10104                              <1> 	;   BL = 2 : Read system font 8x8
 10105                              <1> 	;   BL = 3 : Read system font 8x14
 10106                              <1> 	;   BL = 4 : Read system font 8x16
 10107                              <1> 	;   BL = 5 : Read user defined font 8x8
 10108                              <1> 	;   BL = 6 : Read user defined font 8x16
 10109                              <1> 	;   BL = 7 : Write system font 8x8
 10110                              <1> 	;   BL = 8 : Write system font 8x14
 10111                              <1> 	;   BL = 9 : Write system font 8x16
 10112                              <1> 	;   BL = 10 : Write user defined font 8x8
 10113                              <1> 	;   BL = 11 : Write user defined font 8x16
 10114                              <1> 	;
 10115                              <1> 	;  BL > 11 : invalid (not implemented)
 10116                              <1> 	;
 10117                              <1> 	; For BL = 1 to 11
 10118                              <1> 	;   ECX = number of characters (>= 256)
 10119                              <1> 	;   EDX = first character (ascii code in DL)
 10120                              <1> 	;   ESI = user's buffer address
 10121                              <1> 	;
 10122                              <1> 	; Return: EAX = character count 
 10123                              <1> 
 10124 0001011F 80FB0B              <1> 	cmp	bl, 11
 10125 00010122 7605                <1> 	jna	short sysvideo_27_1
 10126                              <1> sysvideo_27_0:
 10127 00010124 E9C3D7FFFF          <1> 	jmp	sysret ; not implemented yet !		
 10128                              <1> sysvideo_27_1:
 10129 00010129 66B80001            <1> 	mov	ax, 256
 10130 0001012D 08DB                <1> 	or	bl, bl
 10131 0001012F 750E                <1>  	jnz	short sysvideo_27_3
 10132                              <1> 	
 10133                              <1> 	; bl = 0
 10134                              <1> 	; enable system font overwrite 
 10135                              <1> 
 10136 00010131 8025[82120300]7F    <1> 	and	byte [ufont], 7Fh ; clear bit 7
 10137                              <1> sysvideo_27_2:
 10138                              <1> 	;mov	word [u.r0], 256  ; > 0 -> successful
 10139 00010138 A3[64030300]        <1> 	mov	[u.r0], eax ; 256
 10140 0001013D EBE5                <1> 	jmp	short sysvideo_27_0
 10141                              <1> sysvideo_27_3:
 10142 0001013F 80FB01              <1> 	cmp	bl, 1
 10143 00010142 7710                <1> 	ja	short sysvideo_27_4
 10144                              <1> 
 10145                              <1> 	; bl = 1
 10146                              <1> 	; enable system font overwrite 
 10147                              <1> 	;	if [multi_tasking]= 0 and [u.uid] = 0
 10148                              <1> 
 10149                              <1> 	;cmp	byte [multi_tasking], 0 
 10150                              <1> 	;			; multi tasking enabled ?
 10151                              <1> 	;ja	short sysvideo_27_0 ; yes
 10152                              <1> 	;; 19/01/2021 
 10153                              <1> 	;; system maintenance or single user mode
 10154                              <1> 	;cmp	byte [u.uid], 0  ; root ?
 10155                              <1> 	;ja	short sysvideo_27_0 ; no
 10156                              <1> 
 10157                              <1> 	; 19/01/2021
 10158                              <1> 	; multi tasking & root check
 10159 00010144 E817FFFFFF          <1> 	call	sysvideo_22_4
 10160 00010149 73D9                <1> 	jnc	short sysvideo_27_0 ; not permitted
 10161                              <1> 
 10162                              <1> 	; [multi_tasking]= 0 and [u.uid] = 0
 10163                              <1> 
 10164 0001014B 800D[82120300]80    <1> 	or	byte [ufont], 80h ; set bit 7
 10165                              <1> 		
 10166 00010152 EBE4                <1>  	jmp	short sysvideo_27_2
 10167                              <1> 
 10168                              <1> sysvideo_27_4:
 10169 00010154 09C9                <1> 	or	ecx, ecx
 10170 00010156 74CC                <1> 	jz	short sysvideo_27_0
 10171 00010158 21D2                <1> 	and	edx, edx
 10172 0001015A 7410                <1> 	jz	short sysvideo_27_4_0
 10173                              <1> 	;mov	ax, 256
 10174 0001015C 39C1                <1> 	cmp	ecx, eax ; 256
 10175 0001015E 77C4                <1> 	ja	short sysvideo_27_0
 10176 00010160 48                  <1> 	dec	eax
 10177 00010161 39C2                <1> 	cmp	edx, eax ; 255
 10178 00010163 77BF                <1> 	ja	short sysvideo_27_0
 10179 00010165 40                  <1> 	inc	eax
 10180 00010166 29D0                <1> 	sub	eax, edx ; 256 - DX
 10181 00010168 39C8                <1> 	cmp	eax, ecx
 10182 0001016A 72B8                <1> 	jb	short sysvideo_27_0
 10183                              <1> 
 10184                              <1> sysvideo_27_4_0:
 10185 0001016C 89F5                <1> 	mov	ebp, esi
 10186                              <1> 
 10187 0001016E 80FB06              <1> 	cmp	bl, 6
 10188 00010171 776E                <1> 	ja	short sysvideo_27_13
 10189 00010173 7210                <1> 	jb	short sysvideo_27_5
 10190                              <1> 	; bl = 6
 10191 00010175 F605[82120300]10    <1> 	test	byte [ufont], 16 ; 8x16 user font loaded ?
 10192 0001017C 74A6                <1> 	jz	short sysvideo_27_0
 10193                              <1> 	; read 8x16 user defined font
 10194 0001017E BE00400900          <1> 	mov	esi, VGAFONT16USER
 10195 00010183 EB0C                <1> 	jmp	short sysvideo_27_6
 10196                              <1> sysvideo_27_5:
 10197 00010185 80FB04              <1> 	cmp	bl, 4
 10198 00010188 723F                <1> 	jb	short sysvideo_27_11
 10199 0001018A 7725                <1> 	ja	short sysvideo_27_9
 10200                              <1> 	; bl = 4
 10201                              <1> 	; read 8x16 system font
 10202 0001018C BE[246E0100]        <1> 	mov	esi, vgafont16
 10203                              <1> sysvideo_27_6:
 10204                              <1> 	; read 8x16 font
 10205 00010191 66C1E204            <1> 	shl	dx, 4 ; * 16
 10206 00010195 66C1E104            <1> 	shl	cx, 4 ; * 16 ; 16 bytes per char
 10207                              <1> sysvideo_27_7:
 10208 00010199 89EF                <1> 	mov	edi, ebp
 10209 0001019B 01D7                <1> 	add	edi, edx
 10210 0001019D 01D6                <1> 	add	esi, edx
 10211                              <1> 	; ecx = byte count
 10212                              <1> 	; esi = source (in system memory)
 10213                              <1> 	; edi = destination (in user memory)
 10214 0001019F E820110000          <1> 	call	transfer_to_user_buffer
 10215 000101A4 7206                <1> 	jc	short sysvideo_27_8
 10216 000101A6 890D[64030300]      <1> 	mov	[u.r0], ecx	
 10217                              <1> sysvideo_27_8:
 10218 000101AC E93BD7FFFF          <1> 	jmp	sysret
 10219                              <1> sysvideo_27_9:
 10220                              <1> 	; bl = 5
 10221 000101B1 F605[82120300]08    <1> 	test	byte [ufont], 8 ; 8x8 user font loaded ?
 10222 000101B8 74F2                <1> 	jz	short sysvideo_27_8
 10223                              <1> 	; read 8x8 user defined font
 10224 000101BA BE00500900          <1> 	mov	esi, VGAFONT8USER
 10225                              <1> sysvideo_27_10:
 10226                              <1> 	; read 8x8 font
 10227 000101BF 66C1E203            <1> 	shl	dx, 3 ; * 8
 10228 000101C3 66C1E103            <1> 	shl	cx, 3 ; * 8 ; 8 bytes per char
 10229 000101C7 EBD0                <1> 	jmp	short sysvideo_27_7
 10230                              <1> 
 10231                              <1> sysvideo_27_11:
 10232 000101C9 80FB03              <1> 	cmp	bl, 3  ; 8x14 system font
 10233 000101CC 720C                <1> 	jb	short sysvideo_27_12 ; 8x8 system font
 10234                              <1> 	; bl = 3
 10235                              <1> 	; read 8x14 system font 
 10236                              <1> 	;mov	al, 14
 10237                              <1> 	;mul	dl
 10238                              <1> 	;mov	dx, ax
 10239                              <1> 	;push	edx
 10240                              <1> 	;mov	ax, 14
 10241                              <1> 	;mul	cx
 10242                              <1> 	;mov	cx, ax
 10243                              <1> 	;pop	edx
 10244 000101CE E8AB000000          <1> 	call	sysvideo_27_14
 10245 000101D3 BE[24600100]        <1> 	mov	esi, vgafont14
 10246 000101D8 EBBF                <1> 	jmp	short sysvideo_27_7	
 10247                              <1> 	
 10248                              <1> sysvideo_27_12:
 10249                              <1> 	; bl = 2
 10250                              <1> 	; read 8x8 system font 
 10251 000101DA BE[24580100]        <1> 	mov	esi, vgafont8
 10252 000101DF EBDE                <1> 	jmp	short sysvideo_27_10
 10253                              <1> 
 10254                              <1> sysvideo_27_13:
 10255                              <1> 	; overwrite font
 10256 000101E1 80FB0A              <1> 	cmp	bl, 10
 10257 000101E4 7774                <1> 	ja	short sysvideo_27_22 ; 8x16 user font
 10258 000101E6 7224                <1> 	jb	short sysvideo_27_15
 10259                              <1> 	; bl = 10
 10260 000101E8 BF00500900          <1> 	mov	edi, VGAFONT8USER
 10261 000101ED F605[82120300]08    <1> 	test	byte [ufont], 8 ; 8x8 user font loaded ?
 10262 000101F4 755A                <1> 	jnz	short sysvideo_27_21 ; yes
 10263 000101F6 08ED                <1> 	or	ch, ch ; cx = 256
 10264                              <1> 	;jnz	short sysvideo_27_21 ; 256 chars
 10265 000101F8 7406                <1> 	jz	short sysvideo_27_13_0
 10266 000101FA 66B90008            <1> 	mov	cx, 8*256
 10267 000101FE EB39                <1> 	jmp	short sysvideo_27_18_0
 10268                              <1> sysvideo_27_13_0:
 10269                              <1> 	; copy system font to user font before overwrite
 10270 00010200 BE[24580100]        <1> 	mov	esi, vgafont8
 10271                              <1> 	;push	edi
 10272                              <1> 	;push	ecx
 10273                              <1> 	;mov	cl, 64
 10274                              <1> 	;rep	movsd
 10275                              <1> 	;pop	ecx
 10276                              <1> 	;pop	edi
 10277                              <1> 	;mov	esi, ebp ; user's font buffer
 10278 00010205 E888000000          <1> 	call	sysvideo_27_23
 10279 0001020A EB44                <1> 	jmp	short sysvideo_27_21
 10280                              <1> 
 10281                              <1> sysvideo_27_15:
 10282                              <1> 	; check system font overwrite permission
 10283 0001020C F605[82120300]80    <1> 	test	byte [ufont], 80h
 10284 00010213 7497                <1> 	jz	short sysvideo_27_8
 10285                              <1> 
 10286 00010215 80FB08              <1> 	cmp	bl, 8
 10287 00010218 7740                <1> 	ja	short sysvideo_27_22 ; 8x16 system font
 10288 0001021A 722F                <1> 	jb	short sysvideo_27_20 ; 8x8 system font
 10289                              <1> 	; bl = 8
 10290                              <1> 	; overwrite 8x14 system font 
 10291                              <1> 	;mov	al, 14
 10292                              <1> 	;mul	dl
 10293                              <1> 	;mov	dx, ax
 10294                              <1> 	;push	edx
 10295                              <1> 	;mov	ax, 14
 10296                              <1> 	;mul	cx
 10297                              <1> 	;mov	cx, ax
 10298                              <1> 	;pop	edx
 10299 0001021C E85D000000          <1> 	call	sysvideo_27_14
 10300 00010221 BF[24600100]        <1> 	mov	edi, vgafont14
 10301 00010226 EB0D                <1> 	jmp	short sysvideo_27_18
 10302                              <1> sysvideo_27_16:
 10303                              <1> 	; bl = 9
 10304                              <1> 	; overwrite 8x16 system font
 10305 00010228 BF[246E0100]        <1> 	mov	edi, vgafont16
 10306                              <1> sysvideo_27_17:
 10307                              <1> 	; overwrite 8x16 font
 10308 0001022D 66C1E204            <1> 	shl	dx, 4 ; * 16
 10309 00010231 66C1E104            <1> 	shl	cx, 4 ; * 16 ; 16 bytes per char
 10310                              <1> sysvideo_27_18:
 10311 00010235 01D7                <1> 	add	edi, edx
 10312 00010237 01D6                <1> 	add	esi, edx
 10313                              <1> sysvideo_27_18_0:
 10314                              <1> 	; ecx = byte count
 10315                              <1> 	; esi = source (in user memory)
 10316                              <1> 	; edi = destination (in system memory)
 10317 00010239 E8D0100000          <1> 	call	transfer_from_user_buffer
 10318 0001023E 7206                <1> 	jc	short sysvideo_27_19
 10319 00010240 890D[64030300]      <1> 	mov	[u.r0], ecx	
 10320                              <1> sysvideo_27_19:
 10321 00010246 E9A1D6FFFF          <1> 	jmp	sysret
 10322                              <1> sysvideo_27_20:
 10323                              <1> 	; bl = 7
 10324                              <1> 	; overwrite 8x8 system font
 10325 0001024B BF[24580100]        <1> 	mov	edi, vgafont8
 10326                              <1> sysvideo_27_21:
 10327                              <1> 	; write 8x8 font
 10328 00010250 66C1E203            <1> 	shl	dx, 3 ; * 8
 10329 00010254 66C1E103            <1> 	shl	cx, 3 ; * 8 ; 8 bytes per char
 10330 00010258 EBDB                <1> 	jmp	short sysvideo_27_18
 10331                              <1> sysvideo_27_22:
 10332                              <1> 	; bl = 11
 10333                              <1> 	; overwrite 8x16 user defined font
 10334 0001025A BF00400900          <1> 	mov	edi, VGAFONT16USER
 10335 0001025F F605[82120300]10    <1> 	test	byte [ufont], 16 ; 8x16 user font loaded ?
 10336 00010266 75C5                <1> 	jnz	short sysvideo_27_17 ; yes
 10337 00010268 08ED                <1> 	or	ch, ch ; cx = 256
 10338                              <1> 	;jnz	short sysvideo_27_17 ; 256 chars
 10339 0001026A 7406                <1> 	jz	short sysvideo_27_22_0
 10340 0001026C 66B90010            <1> 	mov	cx, 16*256
 10341 00010270 EBC7                <1> 	jmp	short sysvideo_27_18_0
 10342                              <1> sysvideo_27_22_0:
 10343                              <1> 	; copy system font to user font before overwrite
 10344 00010272 BE[246E0100]        <1> 	mov	esi, vgafont16
 10345                              <1> 	;push	edi
 10346                              <1> 	;push	ecx
 10347                              <1> 	;mov	cl, 64
 10348                              <1> 	;rep	movsd
 10349                              <1> 	;pop	ecx
 10350                              <1> 	;pop	edi
 10351                              <1> 	;mov	esi, ebp ; user's font buffer
 10352 00010277 E816000000          <1> 	call	sysvideo_27_23
 10353 0001027C EBAF                <1> 	jmp	short sysvideo_27_17
 10354                              <1> 
 10355                              <1> sysvideo_27_14:
 10356 0001027E B00E                <1> 	mov	al, 14
 10357 00010280 F6E2                <1> 	mul	dl
 10358 00010282 6689C2              <1> 	mov	dx, ax
 10359 00010285 52                  <1> 	push	edx
 10360 00010286 66B80E00            <1> 	mov	ax, 14
 10361 0001028A 66F7E1              <1> 	mul	cx
 10362 0001028D 6689C1              <1> 	mov	cx, ax
 10363 00010290 5A                  <1> 	pop	edx
 10364 00010291 C3                  <1> 	retn	
 10365                              <1> 
 10366                              <1> sysvideo_27_23:
 10367 00010292 57                  <1> 	push	edi
 10368 00010293 51                  <1> 	push	ecx
 10369 00010294 B140                <1> 	mov	cl, 64
 10370 00010296 F3A5                <1> 	rep	movsd
 10371 00010298 59                  <1> 	pop	ecx
 10372 00010299 5F                  <1> 	pop	edi
 10373 0001029A 89EE                <1> 	mov	esi, ebp ; user's font buffer
 10374 0001029C C3                  <1> 	retn
 10375                              <1> 
 10376                              <1> sysvideo_28:
 10377                              <1> 	; 24/01/2021
 10378                              <1> 	; 23/01/2021
 10379                              <1> 	; 18/01/2021
 10380 0001029D 80FF0E              <1> 	cmp	bh, 14
 10381 000102A0 0F8275010000        <1> 	jb	sysvideo_29
 10382 000102A6 0F8754020000        <1> 	ja	sysvideo_30
 10383                              <1> 
 10384                              <1> 	; BH = 14
 10385                              <1> 	; Save/Restore Super VGA video state
 10386                              <1> 	
 10387                              <1> 	; BL = options
 10388                              <1> 	;	bit 0 - Save (0) or Restore (1)	
 10389                              <1> 	;	bit 1 - controller hardware state
 10390                              <1> 	;	bit 2 - BIOS data state
 10391                              <1> 	;	bit 3 - DAC state
 10392                              <1> 	;	bit 4 - (extended) Register state
 10393                              <1> 	;	bit 5 - system (0) or user (1) memory
 10394                              <1> 	;	bit 6 - verify without transfer
 10395                              <1> 	;	bit 7 - not used (must be 0)
 10396                              <1> 
 10397                              <1> 	; ECX = Buffer address or VideoStateID
 10398                              <1> 
 10399 000102AC 803D[54090000]02    <1> 	cmp	byte [vbe3], 2 ;  VESA VBE2 or VBE3 ?
 10400 000102B3 7717                <1> 	ja	short sysvideo_28_0 ; yes
 10401 000102B5 7210                <1> 	jb	short sysvideo_28_16 ; not a SVGA sys !
 10402                              <1> 
 10403                              <1> 	; == VBE2 ==
 10404                              <1> 	; Check Bochs/Qemu/VirtualBox PC emulator
 10405                              <1> 	; (vbe2 is usable only for emulator's vbios)
 10406 000102B7 8A25[55090000]      <1> 	mov	ah, [vbe2bios]
 10407 000102BD 80FCC0              <1> 	cmp	ah, 0C0h	
 10408 000102C0 7205                <1> 	jb	short sysvideo_28_16 ; unknown vbios !
 10409 000102C2 80FCC5              <1> 	cmp	ah, 0C5h
 10410 000102C5 7605                <1> 	jna	short sysvideo_28_0
 10411                              <1> 		; Use kernel's vbios functions (video.s)
 10412                              <1> sysvideo_28_16:
 10413                              <1> 	; unknown vbios !
 10414 000102C7 E920D6FFFF          <1> 	jmp	sysret	
 10415                              <1> 
 10416                              <1> sysvideo_28_0:
 10417 000102CC 80FB7F              <1> 	cmp	bl, 7Fh
 10418 000102CF 77F6                <1> 	ja	short sysvideo_28_16 ; unknown options
 10419                              <1> 
 10420 000102D1 88DA                <1> 	mov	dl, bl
 10421 000102D3 80E21F              <1> 	and	dl, 1Fh 
 10422 000102D6 D0EA                <1> 	shr	dl, 1
 10423 000102D8 74ED                <1> 	jz	short sysvideo_28_16 ; invalid !
 10424                              <1> 	; DL = VBE Function 4F04h Save/Restore options 	
 10425                              <1> 	;  bit 0 : controller hardware state
 10426                              <1> 	;  bit 1 : BIOS data state
 10427                              <1> 	;  bit 2 : DAC state
 10428                              <1> 	;  bit 3 : (extended) Register state
 10429                              <1> 	
 10430 000102DA F6C320              <1> 	test	bl, 32 ; bit 5
 10431 000102DD 0F85B1000000        <1> 	jnz	sysvideo_28_7 ; user buffer
 10432                              <1> 
 10433                              <1> 	; source or destination is kernel/system buffer
 10434                              <1> 
 10435 000102E3 803D[84120300]00    <1> 	cmp	byte [srvsf], 0 ; srs permission flag
 10436 000102EA 76DB                <1> 	jna	short sysvideo_28_16 ; not permitted
 10437                              <1> 
 10438 000102EC F6C301              <1> 	test	bl, 1
 10439 000102EF 743A                <1> 	jz	short sysvideo_28_4 ; Save
 10440                              <1> 
 10441                              <1> 	; Restore
 10442 000102F1 3B0D[86120300]      <1> 	cmp	ecx, [VideoStateID]
 10443 000102F7 75CE                <1> 	jne	short sysvideo_28_16 ; not correct ID !
 10444                              <1> 		
 10445 000102F9 0FB6CA              <1> 	movzx	ecx, dl
 10446 000102FC 80CA80              <1> 	or	dl, 80h
 10447 000102FF 3A15[85120300]      <1> 	cmp	dl, [srvso]
 10448 00010305 75C0                <1> 	jne	short sysvideo_28_16 ; not correct !
 10449                              <1> 
 10450 00010307 88DA                <1> 	mov	dl, bl
 10451                              <1> 
 10452                              <1> 	; ecx = cl = options
 10453 00010309 E85739FFFF          <1> 	call	vbe_srs_gbs
 10454                              <1> 	; ebx = state buffer size (data size)
 10455                              <1> 
 10456 0001030E 891D[64030300]      <1> 	mov	[u.r0], ebx
 10457                              <1> 
 10458 00010314 F6C240              <1> 	test	dl, 64 ; verify without transfer
 10459 00010317 75AE                <1> 	jnz	short sysvideo_28_16 ; yes
 10460                              <1> 
 10461 00010319 BE00580900          <1> 	mov	esi, VBE3VIDEOSTATE	
 10462 0001031E BF00760900          <1> 	mov	edi, VBE3SAVERESTOREBLOCK
 10463 00010323 87CB                <1> 	xchg	ecx, ebx
 10464 00010325 F3A4                <1> 	rep	movsb
 10465                              <1> 	
 10466 00010327 88D9                <1> 	mov	cl, bl
 10467                              <1> 
 10468                              <1> 	; 23/01/2021
 10469 00010329 EB44                <1> 	jmp	short sysvideo_28_10
 10470                              <1> 
 10471                              <1> sysvideo_28_4:
 10472 0001032B 53                  <1> 	push	ebx	
 10473                              <1> 	; 24/01/2021
 10474 0001032C 31DB                <1> 	xor	ebx, ebx ; 0 ; use kernel's buffer
 10475 0001032E 881D[85120300]      <1> 	mov	[srvso], bl ; 0 ; invalidate
 10476 00010334 891D[86120300]      <1> 	mov	[VideoStateID], ebx ; 0 ; invalidate
 10477 0001033A 0FB6CA              <1> 	movzx	ecx, dl ; options
 10478 0001033D B201                <1> 	mov	dl, 1 ; save state		
 10479 0001033F E890000000          <1> 	call	sysvideo_28_11 ; 23/01/2021
 10480                              <1> 	; Note: VBE3 BIOS data save option will be
 10481                              <1> 	;	disabled.. ; 24/01/2021
 10482 00010344 89CA                <1> 	mov	edx, ecx ; state (save) options
 10483 00010346 5B                  <1> 	pop	ebx
 10484                              <1> 	
 10485 00010347 6683F84F            <1> 	cmp	ax, 4Fh ; successful ?
 10486 0001034B 7536                <1> 	jne	short sysvideo_28_3 ; no !
 10487                              <1> 
 10488 0001034D F6C340              <1> 	test	bl, 64 ; verify without transfer
 10489 00010350 7536                <1> 	jnz	short sysvideo_28_6 ; yes
 10490                              <1> 
 10491                              <1> 	; ecx = cl = options
 10492 00010352 E80E39FFFF          <1> 	call	vbe_srs_gbs
 10493                              <1> 	; ebx = state buffer size (data size)
 10494                              <1> 
 10495 00010357 BE00760900          <1> 	mov	esi, VBE3SAVERESTOREBLOCK
 10496 0001035C BF00580900          <1> 	mov	edi, VBE3VIDEOSTATE	
 10497 00010361 89D9                <1> 	mov	ecx, ebx
 10498 00010363 F3A4                <1> 	rep	movsb
 10499                              <1> 
 10500 00010365 88D1                <1> 	mov	cl, dl
 10501 00010367 80C980              <1> 	or	cl, 80h ; SVGA (VESA VBE) flag
 10502                              <1> 	;mov	[srvso], dl
 10503                              <1> 
 10504 0001036A E908010000          <1> 	jmp	sysvideo_28_15
 10505                              <1> 
 10506                              <1> 	; 23/01/2021
 10507                              <1> sysvideo_28_10:
 10508                              <1> 	; CL = VESA VBE3 Save/Restore options
 10509                              <1> 
 10510 0001036F B202                <1> 	mov	dl, 2 ; restore state
 10511                              <1> 
 10512 00010371 E85C000000          <1> 	call	sysvideo_28_1
 10513                              <1> 
 10514 00010376 6683F84F            <1> 	cmp	ax, 4Fh ; successful ?
 10515 0001037A 7407                <1> 	je	short sysvideo_28_3
 10516                              <1> 	;jmp	short sysvideo_28_9 
 10517                              <1> 
 10518                              <1> sysvideo_28_9:
 10519                              <1> 	; return zero size (error) to user
 10520 0001037C 29C0                <1> 	sub	eax, eax
 10521                              <1> sysvideo_28_5:
 10522 0001037E A3[64030300]        <1> 	mov	[u.r0], eax
 10523                              <1> sysvideo_28_3:
 10524 00010383 E964D5FFFF          <1> 	jmp	sysret
 10525                              <1> 
 10526                              <1> sysvideo_28_6:
 10527                              <1> 	; use timer ticks as VideoStateID
 10528 00010388 A1[10820100]        <1> 	mov	eax, [TIMER_LH]
 10529 0001038D 09C0                <1> 	or 	eax, eax
 10530 0001038F 75ED                <1> 	jnz	short sysvideo_28_5
 10531 00010391 40                  <1> 	inc	eax
 10532 00010392 EBEA                <1> 	jmp	short sysvideo_28_5
 10533                              <1> 
 10534                              <1> sysvideo_28_7:
 10535                              <1> 	; save/restore to/from user buffer
 10536                              <1> 
 10537                              <1> 	; 23/01/2021
 10538 00010394 89CE                <1> 	mov	esi, ecx ; user's vstate buffer
 10539 00010396 BF00760900          <1> 	mov	edi, VBE3SAVERESTOREBLOCK
 10540                              <1> 
 10541 0001039B 0FB6CA              <1> 	movzx	ecx, dl ; VESA VBE func 4F04h options
 10542                              <1> 
 10543                              <1> 	; source or destination is user buffer
 10544 0001039E F6C301              <1> 	test	bl, 1
 10545 000103A1 7444                <1> 	jz	short sysvideo_28_12  ; Save
 10546                              <1> 
 10547                              <1> 	; Restore
 10548 000103A3 803D[84120300]00    <1> 	cmp	byte [srvsf], 0 ; srs permission flag
 10549 000103AA 766A                <1> 	jna	short sysvideo_28_14 ; not permitted
 10550                              <1> 
 10551 000103AC 88DA                <1> 	mov	dl, bl ; 'sysvideo' options
 10552                              <1> 
 10553                              <1> 	; ecx = cl = options
 10554 000103AE E8B238FFFF          <1> 	call	vbe_srs_gbs
 10555                              <1> 	; ebx = state buffer size (data size)
 10556                              <1> 
 10557 000103B3 891D[64030300]      <1> 	mov	[u.r0], ebx ; transfer count
 10558                              <1> 
 10559 000103B9 F6C240              <1> 	test	dl, 64 ; verify without transfer
 10560 000103BC 7558                <1> 	jnz	short sysvideo_28_14 ; yes
 10561                              <1>  
 10562 000103BE 6681FB0008          <1> 	cmp	bx, 2048
 10563 000103C3 73B7                <1> 	jnb	short sysvideo_28_9 ; invalid
 10564                              <1> 
 10565 000103C5 87CB                <1> 	xchg	ecx, ebx
 10566                              <1> 	; esi = user buffer
 10567                              <1> 	; edi = VBE3SAVERESTOREBLOCK
 10568                              <1> 
 10569 000103C7 E8420F0000          <1> 	call	transfer_from_user_buffer
 10570 000103CC 72AE                <1> 	jc	short sysvideo_28_9 ; error 
 10571                              <1> 
 10572 000103CE 89D9                <1> 	mov	ecx, ebx ; Function 4F04h options
 10573 000103D0 EB9D                <1> 	jmp	short sysvideo_28_10 ; 23/01/2021
 10574                              <1> 
 10575                              <1> sysvideo_28_1:
 10576 000103D2 31DB                <1> 	xor	ebx, ebx ; 0 ; use kernel's buffer
 10577                              <1> sysvideo_28_11:
 10578                              <1> 	; 24/01/2021
 10579 000103D4 803D[54090000]03    <1> 	cmp	byte [vbe3], 3
 10580 000103DB 7405                <1> 	je	short sysvideo_28_2
 10581                              <1> 
 10582                              <1> 	; VESA VBE2 (BOCHS/QEMU/VBOX) video bios
 10583 000103DD E9EC37FFFF          <1> 	jmp	_vbe_biosfn_save_restore_state
 10584                              <1> sysvideo_28_2:
 10585                              <1> 	;24/01/2021
 10586                              <1> 	;mov	eax, 4F04h  ; Save/Restore vstate
 10587                              <1> 	; VESA VBE3 video bios
 10588 000103E2 E94F16FFFF          <1> 	jmp	_vbe3_pmfn_save_restore_state
 10589                              <1> 	
 10590                              <1> sysvideo_28_12:
 10591                              <1> 	; Save
 10592                              <1> 	;mov	edi, VBE3SAVERESTOREBLOCK
 10593                              <1> 
 10594                              <1> 	;movzx	ecx, dl ; options
 10595 000103E7 56                  <1> 	push	esi
 10596 000103E8 53                  <1> 	push	ebx
 10597                              <1> 	; 23/01/2021
 10598 000103E9 B201                <1> 	mov	dl, 1 ; save state
 10599 000103EB E8E2FFFFFF          <1> 	call	sysvideo_28_1
 10600 000103F0 5A                  <1> 	pop	edx ; 'sysvideo' options
 10601 000103F1 5F                  <1> 	pop	edi ; user's video state buffer
 10602                              <1> 
 10603 000103F2 6683F84F            <1> 	cmp	ax, 4Fh ; successful ?
 10604 000103F6 751E                <1> 	jne	short sysvideo_28_14 ; no !
 10605                              <1> 
 10606                              <1> 	; ecx = cl = options
 10607 000103F8 E86838FFFF          <1> 	call	vbe_srs_gbs
 10608                              <1> 	; ebx = state buffer size (data size)
 10609                              <1> 
 10610 000103FD 89D9                <1> 	mov	ecx, ebx ; transfer count
 10611                              <1> 
 10612 000103FF F6C240              <1> 	test	dl, 64 ; verify without transfer
 10613 00010402 750C                <1> 	jnz	short sysvideo_28_13 ; yes
 10614                              <1> 		
 10615                              <1> 	;mov	edi, esi
 10616 00010404 BE00760900          <1> 	mov	esi, VBE3SAVERESTOREBLOCK
 10617 00010409 E8B60E0000          <1> 	call	transfer_to_user_buffer
 10618 0001040E 7206                <1> 	jc	short sysvideo_28_14
 10619                              <1> sysvideo_28_13:
 10620 00010410 890D[64030300]      <1> 	mov	[u.r0], ecx
 10621                              <1> sysvideo_28_14:
 10622 00010416 E9D1D4FFFF          <1> 	jmp	sysret
 10623                              <1> 
 10624                              <1> sysvideo_29:
 10625                              <1> 	; 18/01/2021
 10626                              <1> 	; BH = 13
 10627                              <1> 	; Save/Restore std VGA video state
 10628                              <1> 
 10629                              <1> 	; bl = 0..3
 10630                              <1> 	;	save to or restore from
 10631                              <1> 	;	system buffer, VBE3VIDEOSTATE
 10632                              <1> 	;	ECX = VideoStateID for restoring	
 10633                              <1> 	; bl = 4..7
 10634                              <1> 	;	save to or restore from
 10635                              <1> 	;	user buffer pointed by ECX
 10636                              <1> 		   	
 10637 0001041B 80FB03              <1> 	cmp	bl, 3
 10638 0001041E 7776                <1> 	ja	short sysvideo_29_6
 10639                              <1> 
 10640                              <1> 	; source or destination is kernel/system buffer
 10641                              <1> 
 10642 00010420 803D[84120300]00    <1> 	cmp	byte [srvsf], 0 ; srs permission flag
 10643 00010427 7668                <1> 	jna	short sysvideo_29_5 ; not permitted
 10644                              <1> 
 10645 00010429 F6C301              <1> 	test	bl, 1
 10646 0001042C 7437                <1> 	jz	short sysvideo_29_2  ; Save
 10647                              <1> 
 10648                              <1> 	; Restore
 10649 0001042E 3B0D[86120300]      <1> 	cmp	ecx, [VideoStateID]
 10650 00010434 755B                <1> 	jne	short sysvideo_29_5 ; not correct ID !
 10651 00010436 80FB01              <1> 	cmp	bl, 1
 10652 00010439 7709                <1> 	ja	short sysvideo_29_0
 10653                              <1> 	; bl = 1
 10654 0001043B BB6E000000          <1> 	mov	ebx, 110 
 10655 00010440 B103                <1> 	mov	cl, 3 ; ctrl, vbios data
 10656 00010442 EB07                <1> 	jmp	short sysvideo_29_1
 10657                              <1> sysvideo_29_0:
 10658                              <1>  	; bl  = 3
 10659 00010444 BB72030000          <1> 	mov	ebx, 882 
 10660 00010449 B107                <1> 	mov	cl, 7 ; ctrl, vbios data, dac
 10661                              <1> sysvideo_29_1:
 10662 0001044B 3A0D[85120300]      <1> 	cmp	cl, [srvso]
 10663 00010451 753E                <1> 	jne	short sysvideo_29_5 ; not correct !
 10664                              <1> 
 10665 00010453 BE00580900          <1> 	mov	esi, VBE3VIDEOSTATE ; 22/01/2021
 10666 00010458 E8A239FFFF          <1> 	call	biosfn_restore_video_state
 10667 0001045D 891D[64030300]      <1> 	mov	[u.r0], ebx ; video state size (bytes)
 10668                              <1> 	;jmp	sysret
 10669 00010463 EB2C                <1> 	jmp	short sysvideo_29_5	
 10670                              <1> sysvideo_29_2:
 10671                              <1> 	;mov	esi, ecx
 10672 00010465 BF00580900          <1> 	mov	edi, VBE3VIDEOSTATE
 10673                              <1> 	
 10674 0001046A B107                <1> 	mov	cl, 7 ; ctrl, vbios data, dac
 10675 0001046C 08DB                <1> 	or	bl, bl
 10676 0001046E 7502                <1> 	jnz	short sysvideo_29_3 ; bl = 2
 10677                              <1> 	; bl = 0 
 10678 00010470 B103                <1> 	mov	cl, 3 ; ctrl, vbios data
 10679                              <1> sysvideo_29_3:
 10680 00010472 E81A38FFFF          <1> 	call	biosfn_save_video_state
 10681                              <1> sysvideo_28_15:
 10682                              <1> 	; use timer ticks as VideoStateID
 10683 00010477 A1[10820100]        <1> 	mov	eax, [TIMER_LH]
 10684 0001047C 21C0                <1> 	and 	eax, eax
 10685 0001047E 7501                <1> 	jnz	short sysvideo_29_4
 10686 00010480 40                  <1> 	inc	eax
 10687                              <1> sysvideo_29_4:
 10688 00010481 880D[85120300]      <1> 	mov	[srvso], cl
 10689 00010487 A3[86120300]        <1> 	mov	[VideoStateID], eax
 10690 0001048C A3[64030300]        <1> 	mov	[u.r0], eax
 10691                              <1> sysvideo_29_5:
 10692 00010491 E956D4FFFF          <1> 	jmp	sysret
 10693                              <1> 
 10694                              <1> sysvideo_29_6:
 10695 00010496 80FB07              <1> 	cmp	bl, 7
 10696 00010499 77F6                <1> 	ja	short sysvideo_29_5 ; invalid sub function 
 10697                              <1> 
 10698 0001049B 89CE                <1> 	mov	esi, ecx
 10699 0001049D BF00760900          <1> 	mov	edi, VBE3SAVERESTOREBLOCK
 10700                              <1> 
 10701                              <1> 	; source or destination is user buffer
 10702 000104A2 F6C301              <1> 	test	bl, 1
 10703 000104A5 7434                <1> 	jz	short sysvideo_29_9  ; Save
 10704                              <1> 
 10705                              <1> 	; Restore
 10706 000104A7 803D[84120300]00    <1> 	cmp	byte [srvsf], 0 ; srs permission flag
 10707 000104AE 76E1                <1> 	jna	short sysvideo_29_5 ; not permitted
 10708                              <1> 	
 10709                              <1> 	;mov	esi, ecx
 10710                              <1> 	;mov	edi, VBE3SAVERESTOREBLOCK
 10711                              <1> 	
 10712 000104B0 80FB07              <1> 	cmp	bl, 7
 10713 000104B3 7409                <1> 	je	short sysvideo_29_7
 10714                              <1> 	; bl = 5 
 10715 000104B5 B303                <1> 	mov	bl, 3
 10716 000104B7 B96E000000          <1> 	mov	ecx, 110
 10717 000104BC EB05                <1> 	jmp	short sysvideo_29_8
 10718                              <1> sysvideo_29_7:
 10719                              <1> 	; bl = 7
 10720 000104BE B972030000          <1> 	mov	ecx, 882
 10721                              <1> sysvideo_29_8:
 10722 000104C3 E8460E0000          <1> 	call	transfer_from_user_buffer
 10723 000104C8 72C7                <1> 	jc	short sysvideo_29_5
 10724 000104CA 890D[64030300]      <1> 	mov	[u.r0], ecx
 10725 000104D0 88D9                <1> 	mov	cl, bl ; mov cl,7 (mov cl,3)
 10726 000104D2 89FE                <1> 	mov	esi, edi ; VBE3SAVERESTOREBLOCK
 10727                              <1> 	; cl = 3 or 7  	
 10728 000104D4 E82639FFFF          <1> 	call	biosfn_restore_video_state
 10729 000104D9 EBB6                <1> 	jmp	sysvideo_29_5
 10730                              <1> 	;jmp	sysret
 10731                              <1> sysvideo_29_9:
 10732                              <1> 	; Save
 10733                              <1> 	;mov	edi, VBE3SAVERESTOREBLOCK
 10734                              <1> 
 10735 000104DB 80FB06              <1> 	cmp	bl, 6
 10736 000104DE 7409                <1> 	je	short sysvideo_29_10
 10737                              <1> 	; bl = 4
 10738 000104E0 BB6E000000          <1> 	mov	ebx, 110
 10739 000104E5 B103                <1> 	mov	cl, 3 ; ctrl, vbios data
 10740 000104E7 EB07                <1> 	jmp	short sysvideo_29_11
 10741                              <1> sysvideo_29_10:
 10742                              <1> 	; bl = 6
 10743 000104E9 BB72030000          <1> 	mov	ebx, 882
 10744 000104EE B107                <1> 	mov	cl, 7 ; ctrl, vbios data, dac
 10745                              <1> sysvideo_29_11:
 10746 000104F0 E89C37FFFF          <1> 	call	biosfn_save_video_state
 10747                              <1> 
 10748 000104F5 89D9                <1> 	mov	ecx, ebx ; transfer count
 10749 000104F7 89F7                <1> 	mov	edi, esi
 10750 000104F9 BE00760900          <1> 	mov	esi, VBE3SAVERESTOREBLOCK
 10751                              <1> 
 10752                              <1> 	;call	transfer_to_user_buffer
 10753                              <1> 	;jc	short sysvideo_29_5
 10754                              <1> 	;mov	[u.r0], ecx ; transfer count
 10755                              <1> 	;;jmp	sysret
 10756                              <1> 	;jmp	short sysvideo_29_5
 10757                              <1>  
 10758 000104FE EB1A                <1> 	jmp	short sysvideo_29_12
 10759                              <1> 
 10760                              <1> sysvideo_30:	 
 10761 00010500 80FF0F              <1> 	cmp	bh, 15
 10762 00010503 7722                <1> 	ja	short sysvideo_31 ; invalid function
 10763                              <1> 	
 10764                              <1> 	; BH = 15
 10765                              <1> 	; Copy VESA EDID to user's buffer
 10766                              <1> 	
 10767 00010505 803D[25430000]4F    <1> 	cmp	byte [edid], 4Fh
 10768 0001050C 7519                <1> 	jne	short sysvideo_31 ; not ready ! 
 10769                              <1> 
 10770                              <1> 	;and	ecx, ecx
 10771                              <1> 	;jz	short sysvideo_31
 10772                              <1> 
 10773                              <1> 	; ecx = user's buffer address
 10774 0001050E 89CF                <1> 	mov	edi, ecx
 10775 00010510 BE[9C110300]        <1> 	mov	esi, edid_info
 10776 00010515 B980000000          <1> 	mov	ecx, 128 ; 128 bytes
 10777                              <1> sysvideo_29_12:
 10778 0001051A E8A50D0000          <1> 	call	transfer_to_user_buffer
 10779 0001051F 7206                <1> 	jc	short sysvideo_31
 10780                              <1> 
 10781 00010521 890D[64030300]      <1> 	mov	[u.r0], ecx ; EDID size, 128 bytes
 10782                              <1> sysvideo_31:
 10783 00010527 E9C0D3FFFF          <1> 	jmp	sysret
 10784                              <1> 
 10785                              <1> mkdir:
 10786                              <1> 	; 04/12/2015 (14 byte directory names)
 10787                              <1> 	; 12/10/2015
 10788                              <1> 	; 17/06/2015 (Retro UNIX 386 v1 - Beginning)
 10789                              <1> 	; 29/04/2013 - 01/08/2013 (Retro UNIX 8086 v1)
 10790                              <1> 	;
 10791                              <1> 	; 'mkdir' makes a directory entry from the name pointed to
 10792                              <1> 	; by u.namep into the current directory.
 10793                              <1> 	;
 10794                              <1> 	; INPUTS ->
 10795                              <1> 	;    u.namep - points to a file name 
 10796                              <1> 	;	           that is about to be a directory entry.
 10797                              <1> 	;    ii - current directory's i-number.	
 10798                              <1> 	; OUTPUTS ->
 10799                              <1> 	;    u.dirbuf+2 - u.dirbuf+10 - contains file name. 
 10800                              <1> 	;    u.off - points to entry to be filled 
 10801                              <1> 	;	     in the current directory		
 10802                              <1> 	;    u.base - points to start of u.dirbuf.
 10803                              <1> 	;    r1 - contains i-number of current directory 
 10804                              <1> 	;	
 10805                              <1> 	; ((AX = R1)) output
 10806                              <1> 	;
 10807                              <1> 	;    (Retro UNIX Prototype : 11/11/2012, UNIXCOPY.ASM)
 10808                              <1>         ;    ((Modified registers: eAX, eDX, eBX, eCX, eSI, eDI, eBP))  
 10809                              <1> 	;
 10810                              <1> 
 10811                              <1> 	; 17/06/2015 - 32 bit modifications (Retro UNIX 386 v1)
 10812 0001052C 31C0                <1> 	xor 	eax, eax
 10813 0001052E BF[9A030300]        <1> 	mov     edi, u.dirbuf+2
 10814 00010533 89FE                <1> 	mov	esi, edi
 10815 00010535 AB                  <1> 	stosd
 10816 00010536 AB                  <1> 	stosd
 10817                              <1> 	; 04/12/2015 (14 byte directory names)
 10818 00010537 AB                  <1> 	stosd
 10819 00010538 66AB                <1> 	stosw
 10820                              <1> 		; jsr r0,copyz; u.dirbuf+2; u.dirbuf+10. / clear this
 10821 0001053A 89F7                <1> 	mov	edi, esi ; offset to u.dirbuf
 10822                              <1> 	; 12/10/2015 ([u.namep] -> ebp)
 10823                              <1> 	;mov 	ebp, [u.namep]
 10824 0001053C E80D030000          <1> 	call	trans_addr_nmbp ; convert virtual address to physical
 10825                              <1> 		; esi = physical address (page start + offset)
 10826                              <1> 		; ecx = byte count in the page (1 - 4096)
 10827                              <1> 	; edi = offset to u.dirbuf (edi is not modified in trans_addr_nm)
 10828                              <1> 		; mov u.namep,r2 / r2 points to name of directory entry
 10829                              <1> 		; mov $u.dirbuf+2,r3 / r3 points to u.dirbuf+2
 10830                              <1> mkdir_1: ; 1: 
 10831 00010541 45                  <1> 	inc	ebp ; 12/10/2015
 10832                              <1> 	;
 10833                              <1> 	; / put characters in the directory name in u.dirbuf+2 - u.dirbuf+10
 10834                              <1> 	 ; 01/08/2013
 10835 00010542 AC                  <1> 	lodsb
 10836                              <1> 		; movb (r2)+,r1 / move character in name to r1
 10837 00010543 20C0                <1> 	and 	al, al
 10838 00010545 7427                <1> 	jz 	short mkdir_3 	  
 10839                              <1> 		; beq 1f / if null, done
 10840 00010547 3C2F                <1> 	cmp	al, '/'
 10841                              <1> 		; cmp r1,$'/ / is it a "/"?
 10842 00010549 7414                <1> 	je	short mkdir_err
 10843                              <1> 	;je	error
 10844                              <1> 		; beq error9 / yes, error
 10845                              <1> 	; 12/10/2015
 10846 0001054B 6649                <1> 	dec	cx
 10847 0001054D 7505                <1> 	jnz	short mkdir_2
 10848                              <1> 	; 12/10/2015 ([u.namep] -> ebp)
 10849 0001054F E800030000          <1> 	call	trans_addr_nm ; convert virtual address to physical
 10850                              <1> 		; esi = physical address (page start + offset)
 10851                              <1> 		; ecx = byte count in the page
 10852                              <1> 	; edi = offset to u.dirbuf (edi is not modified in trans_addr_nm)
 10853                              <1> mkdir_2:
 10854 00010554 81FF[A8030300]      <1> 	cmp     edi, u.dirbuf+16 ; ; 04/12/2015 (10 -> 16) 
 10855                              <1> 		; cmp r3,$u.dirbuf+10. / have we reached the last slot for
 10856                              <1> 				     ; / a char?
 10857 0001055A 74E5                <1> 	je	short mkdir_1
 10858                              <1> 		; beq 1b / yes, go back
 10859 0001055C AA                  <1> 	stosb
 10860                              <1> 		; movb r1,(r3)+ / no, put the char in the u.dirbuf
 10861 0001055D EBE2                <1> 	jmp 	short mkdir_1
 10862                              <1> 		; br 1b / get next char
 10863                              <1> mkdir_err:
 10864                              <1> 	; 17/06/2015
 10865 0001055F C705[C8030300]1300- <1> 	mov	dword [u.error], ERR_NOT_DIR ; 'not a valid directory !'
 10865 00010567 0000                <1>
 10866 00010569 E95ED3FFFF          <1> 	jmp	error
 10867                              <1> 
 10868                              <1> mkdir_3: ; 1:
 10869 0001056E A1[78030300]        <1> 	mov	eax, [u.dirp]
 10870 00010573 A3[80030300]        <1> 	mov	[u.off], eax
 10871                              <1> 		; mov u.dirp,u.off / pointer to empty current directory
 10872                              <1> 				 ; / slot to u.off
 10873                              <1> wdir: ; 29/04/2013
 10874 00010578 C705[84030300]-     <1>         mov     dword [u.base], u.dirbuf
 10874 0001057E [98030300]          <1>
 10875                              <1> 		; mov $u.dirbuf,u.base / u.base points to created file name
 10876 00010582 C705[88030300]1000- <1>         mov     dword [u.count], 16 ; 04/12/2015 (10 -> 16) 
 10876 0001058A 0000                <1>
 10877                              <1> 		; mov $10.,u.count / u.count = 10
 10878 0001058C 66A1[51040300]      <1> 	mov	ax, [ii] 
 10879                              <1> 		; mov ii,r1 / r1 has i-number of current directory
 10880 00010592 B201                <1> 	mov	dl, 1 ; owner flag mask ; RETRO UNIX 8086 v1 modification !
 10881 00010594 E8741D0000          <1> 	call 	access
 10882                              <1> 		; jsr r0,access; 1 / get i-node and set its file up 
 10883                              <1> 				 ; / for writing
 10884                              <1> 	; AX = i-number of current directory
 10885                              <1> 	; 01/08/2013
 10886 00010599 FE05[C6030300]      <1> 	inc     byte [u.kcall] ; the caller is 'mkdir' sign	
 10887 0001059F E8820F0000          <1> 	call	writei
 10888                              <1> 		; jsr r0,writei / write into directory
 10889 000105A4 C3                  <1> 	retn	
 10890                              <1> 		; rts r0
 10891                              <1> 
 10892                              <1> sysexec:
 10893                              <1> 	; 18/11/2017
 10894                              <1> 	; 14/11/2017
 10895                              <1> 	; 13/11/2017
 10896                              <1> 	; 24/10/2016, 04/01/2017
 10897                              <1> 	; 24/04/2016 - TRDOS 386 (TRDOS v2.0)
 10898                              <1> 	; 23/06/2015 - 23/10/2015 (Retro UNIX 386 v1)
 10899                              <1> 	; 03/06/2013 - 06/12/2013 (Retro UNIX 8086 v1)
 10900                              <1> 	;
 10901                              <1> 	; 'sysexec' initiates execution of a file whose path name if
 10902                              <1> 	; pointed to by 'name' in the sysexec call. 
 10903                              <1> 	; 'sysexec' performs the following operations:
 10904                              <1> 	;    1. obtains i-number of file to be executed via 'namei'.
 10905                              <1> 	;    2. obtains i-node of file to be exceuted via 'iget'.
 10906                              <1> 	;    3. sets trap vectors to system routines.
 10907                              <1> 	;    4. loads arguments to be passed to executing file into
 10908                              <1> 	;	highest locations of user's core
 10909                              <1> 	;    5. puts pointers to arguments in locations immediately
 10910                              <1> 	;	following arguments.
 10911                              <1> 	;    6.	saves number of arguments in next location.
 10912                              <1> 	;    7. intializes user's stack area so that all registers
 10913                              <1> 	;	will be zeroed and the PS is cleared and the PC set
 10914                              <1> 	;	to core when 'sysret' restores registers 
 10915                              <1> 	;	and does an rti.
 10916                              <1> 	;    8. inializes u.r0 and u.sp
 10917                              <1> 	;    9. zeros user's core down to u.r0
 10918                              <1> 	;   10.	reads executable file from storage device into core
 10919                              <1> 	;	starting at location 'core'.
 10920                              <1> 	;   11.	sets u.break to point to end of user's code with
 10921                              <1> 	;	data area appended.
 10922                              <1> 	;   12.	calls 'sysret' which returns control at location
 10923                              <1> 	;	'core' via 'rti' instruction. 		  		
 10924                              <1> 	;
 10925                              <1> 	; Calling sequence:
 10926                              <1> 	;	sysexec; namep; argp
 10927                              <1> 	; Arguments:
 10928                              <1> 	;	namep - points to pathname of file to be executed
 10929                              <1> 	;	argp  - address of table of argument pointers
 10930                              <1> 	;	argp1... argpn - table of argument pointers
 10931                              <1> 	;	argp1:<...0> ... argpn:<...0> - argument strings
 10932                              <1> 	; Inputs: (arguments)
 10933                              <1> 	; Outputs: -	
 10934                              <1> 	; ...............................................................
 10935                              <1> 	;
 10936                              <1> 	; Retro UNIX 386 v1 modification: 
 10937                              <1> 	;	User application runs in it's own virtual space 
 10938                              <1> 	;	which is izolated from kernel memory (and other
 10939                              <1> 	;	memory pages) via 80386	paging in ring 3 
 10940                              <1> 	;	privilige mode. Virtual start address is always 0.
 10941                              <1> 	;	User's core memory starts at linear address 400000h
 10942                              <1> 	;	(the end of the 1st 4MB).
 10943                              <1> 	;
 10944                              <1> 	; Retro UNIX 8086 v1 modification: 
 10945                              <1> 	;	user/application segment and system/kernel segment
 10946                              <1> 	;	are different and sysenter/sysret/sysrele routines
 10947                              <1> 	;	are different (user's registers are saved to 
 10948                              <1> 	;	and then restored from system's stack.)
 10949                              <1> 	;
 10950                              <1> 	;	NOTE: Retro UNIX 8086 v1 'arg2' routine gets these
 10951                              <1> 	;	      arguments which were in these registers;
 10952                              <1> 	;	      but, it returns by putting the 1st argument
 10953                              <1> 	;	      in 'u.namep' and the 2nd argument
 10954                              <1> 	;	      on top of stack. (1st argument is offset of the
 10955                              <1> 	;	      file/path name in the user's program segment.)		 	
 10956                              <1> 	
 10957                              <1> 	;call	arg2
 10958                              <1> 	; * name - 'u.namep' points to address of file/path name
 10959                              <1> 	;          in the user's program segment ('u.segmnt')
 10960                              <1> 	;          with offset in BX register (as sysopen argument 1).
 10961                              <1> 	; * argp - sysexec argument 2 is in CX register 
 10962                              <1> 	;          which is on top of stack.
 10963                              <1> 	;
 10964                              <1> 		; jsr r0,arg2 / arg0 in u.namep,arg1 on top of stack
 10965                              <1> 
 10966                              <1> 	; 23/06/2015 (32 bit modifications)
 10967                              <1> 
 10968                              <1> 	;; 13/11/2017
 10969                              <1> 	;;mov	[u.namep], ebx ; argument 1
 10970                              <1>         ; 18/10/2015
 10971 000105A5 890D[4C040300]      <1> 	mov     [argv], ecx  ; * ; argument 2
 10972                              <1> 
 10973                              <1> 	; 13/11/2017
 10974 000105AB 89DE                <1> 	mov	esi, ebx
 10975 000105AD E88E210000          <1> 	call	set_working_path_x
 10976 000105B2 7319                <1> 	jnc	short sysexec_0
 10977                              <1> 
 10978                              <1> 	;; 'bad command or file name'
 10979                              <1> 	;mov	eax, ERR_BAD_CMD_ARG ; 01h ; TRDOS 8086
 10980                              <1> 	
 10981                              <1> 	; 'file not found !' error
 10982 000105B4 B802000000          <1> 	mov	eax, ERR_NOT_FOUND ; 02h ; TRDOS 8086
 10983                              <1> sysexec_not_found_err:
 10984                              <1> sysexec_access_error:
 10985                              <1> sysexec_ext_error:
 10986 000105B9 A3[64030300]        <1> 	mov	[u.r0], eax
 10987 000105BE A3[C8030300]        <1> 	mov	[u.error], eax
 10988 000105C3 E84D220000          <1> 	call 	reset_working_path
 10989 000105C8 E9FFD2FFFF          <1> 	jmp	error
 10990                              <1> 
 10991                              <1> sysexec_0:
 10992                              <1> 	; 13/11/2017
 10993                              <1> 	;mov	esi, FindFile_Name
 10994 000105CD 66B80018            <1>         mov	ax, 1800h ; Only files 
 10995 000105D1 E89B8EFFFF          <1> 	call	find_first_file
 10996 000105D6 72E1                <1> 	jc	short sysexec_not_found_err ; eax = 2
 10997                              <1> 
 10998                              <1> 	; check_ file attributes
 10999                              <1> 	; (attribute bits = 00ADVSHR) ; 18h = Directory+Volume
 11000                              <1> 	; BL = Attributes byte
 11001                              <1> 	
 11002 000105D8 F6C306              <1>         test	bl, 6  ; system file or hidden file (S+H) 
 11003                              <1> 	;jz	short sysexec_0ext
 11004 000105DB 7417                <1> 	jz	short sysexec_1 ; yes
 11005                              <1> 
 11006                              <1> 	; 13/11/2017 
 11007                              <1> 	; /// TRDOS386 permission check for multiuser mode ///
 11008                              <1> 	; SYSTEM file or HIDDEN file !!
 11009                              <1> 	; (Only super user has permission to run this file.)
 11010                              <1> 	
 11011                              <1> 	; ([u.uid]=0 for super user or root in multiuser mode)  
 11012                              <1> 	; ([u.uid]=0 for any users in singleuser mode) 
 11013 000105DD 803D[B0030300]00    <1> 	cmp 	byte [u.uid], 0 ; Super User ([u.uid]=0) ?
 11014                              <1> 	;jna	short sysexec_0ext
 11015 000105E4 760E                <1> 	jna	short sysexec_1 ; yes 
 11016                              <1> 
 11017                              <1> 	; 'permission denied !' error  
 11018 000105E6 B80B000000          <1>         mov	eax, ERR_FILE_ACCESS  ; 11 = ERR_PERM_DENIED
 11019 000105EB EBCC                <1>         jmp	short sysexec_access_error
 11020                              <1> 
 11021                              <1> sysexec_not_exf:
 11022                              <1> 	; 'not executable file !' error
 11023 000105ED B816000000          <1> 	mov	eax, ERR_NOT_EXECUTABLE
 11024 000105F2 EBC5                <1> 	jmp	sysexec_ext_error
 11025                              <1> 
 11026                              <1> ;sysexec_0ext:
 11027                              <1> sysexec_1:
 11028                              <1> 	; 18/11/2017
 11029 000105F4 BE[388B0100]        <1> 	mov	esi, FindFile_Name
 11030                              <1> 	; 13/11/2017
 11031                              <1> 	; check program file name extension
 11032                              <1> 	; ('.PRG' for current TRDOS version)
 11033 000105F9 E816A9FFFF          <1> 	call	check_prg_filename_ext
 11034 000105FE 72ED                <1> 	jc	short sysexec_not_exf
 11035                              <1> 	
 11036                              <1> 	; 18/11/2017
 11037 00010600 3C50                <1> 	cmp	al, 'P'
 11038 00010602 75E9                <1> 	jne	short sysexec_not_exf	
 11039                              <1> 
 11040                              <1> 	; '.PRG' extension is OK.
 11041                              <1> 	; Only '.PRG' files are valid program files
 11042                              <1> 	; for current TRDOS 386 version.
 11043                              <1> 
 11044 00010604 8B15[648B0100]      <1> 	mov	edx, [FindFile_DirEntry+DirEntry_FileSize]
 11045 0001060A 66A1[5C8B0100]      <1> 	mov	ax, [FindFile_DirEntry+DirEntry_FstClusHI]
 11046 00010610 C1E010              <1> 	shl	eax, 16
 11047 00010613 66A1[628B0100]      <1> 	mov	ax, [FindFile_DirEntry+DirEntry_FstClusLO]
 11048                              <1> 	; EAX = First Cluster number
 11049                              <1> 	; EDX = File Size
 11050                              <1> 
 11051 00010619 A3[51040300]        <1> 	mov	[ii], eax
 11052 0001061E 8915[55040300]      <1> 	mov	[i.size], edx
 11053                              <1> 
 11054                              <1> ;sysexec_1:
 11055                              <1> 	; 13/11/2017 - TRDOS 386 (TRDOS v2.0)
 11056                              <1> 	; 24/06/2015 - 23/10/2015 (Retro UNIX 386 v1)
 11057                              <1>         ; Moving arguments to the end of [u.upage]
 11058                              <1> 	; (by regarding page borders in user's memory space)
 11059                              <1> 	;
 11060                              <1> 	; 10/10/2015
 11061                              <1> 	; 21/07/2015
 11062 00010624 89E5                <1> 	mov	ebp, esp ; (**)
 11063                              <1> 	; 18/10/2015
 11064 00010626 89EF                <1> 	mov 	edi, ebp
 11065 00010628 B900010000          <1> 	mov 	ecx, MAX_ARG_LEN ; 256
 11066                              <1> 	;sub	edi, MAX_ARG_LEN ; 256
 11067 0001062D 29CF                <1> 	sub	edi, ecx
 11068 0001062F 89FC                <1> 	mov	esp, edi ; *!*
 11069 00010631 31C0                <1> 	xor	eax, eax
 11070 00010633 A3[8C030300]        <1> 	mov 	[u.nread], eax ; 0
 11071 00010638 66A3[4A040300]      <1> 	mov	[argc], ax ; 0 ; 13/11/2017
 11072 0001063E 49                  <1> 	dec	ecx ; 256 - 1
 11073 0001063F 890D[88030300]      <1> 	mov 	[u.count], ecx ; MAX_ARG_LEN - 1 ; 255
 11074                              <1> 	;mov 	dword [u.count], MAX_ARG_LEN - 1 ; 255
 11075                              <1> sysexec_2:
 11076 00010645 8B35[4C040300]      <1> 	mov	esi, [argv] ; 18/10/2015 
 11077 0001064B E866000000          <1> 	call	get_argp
 11078 00010650 B904000000          <1> 	mov	ecx, 4 ; mov ecx, 4
 11079                              <1> sysexec_3:
 11080 00010655 21C0                <1> 	and	eax, eax
 11081 00010657 0F846F050000        <1>         jz      sysexec_6
 11082                              <1> 	; 18/10/2015
 11083 0001065D 010D[4C040300]      <1> 	add	[argv], ecx ; 4
 11084 00010663 66FF05[4A040300]    <1> 	inc	word [argc]
 11085                              <1> 	;
 11086 0001066A A3[84030300]        <1> 	mov	[u.base], eax
 11087                              <1>  	; 23/10/2015
 11088 0001066F 66C705[C4030300]00- <1> 	mov	word [u.pcount], 0
 11088 00010677 00                  <1>
 11089                              <1> sysexec_4:
 11090 00010678 E8E70B0000          <1> 	call	cpass ; get a character from user's core memory
 11091 0001067D 750E                <1>         jnz	short sysexec_5
 11092                              <1> 		; (max. 255 chars + null)
 11093                              <1> 	; 18/10/2015
 11094 0001067F 28C0                <1> 	sub 	al, al
 11095 00010681 AA                  <1> 	stosb
 11096 00010682 FF05[8C030300]      <1> 	inc	dword [u.nread]
 11097 00010688 E93F050000          <1> 	jmp	sysexec_6 ; 24/04/2016
 11098                              <1> sysexec_5:
 11099 0001068D AA                  <1> 	stosb
 11100 0001068E 20C0                <1> 	and 	al, al
 11101 00010690 75E6                <1> 	jnz	short sysexec_4
 11102 00010692 B904000000          <1> 	mov	ecx, 4
 11103 00010697 390D[48040300]      <1> 	cmp	[ncount], ecx ; 4
 11104 0001069D 72A6                <1> 	jb	short sysexec_2
 11105 0001069F 8B35[44040300]      <1> 	mov	esi, [nbase]
 11106 000106A5 010D[44040300]      <1> 	add	[nbase], ecx ; 4	
 11107 000106AB 66290D[48040300]    <1> 	sub	[ncount], cx 
 11108 000106B2 8B06                <1> 	mov	eax, [esi]
 11109 000106B4 EB9F                <1> 	jmp	short sysexec_3
 11110                              <1> 
 11111                              <1> get_argp:
 11112                              <1> 	; 14/11/2017 - TRDOS 386 (TRDOS v2.0)
 11113                              <1> 	; 18/10/2015 (nbase, ncount)
 11114                              <1> 	; 21/07/2015
 11115                              <1> 	; 24/06/2015 (Retro UNIX 386 v1)
 11116                              <1> 	; Get (virtual) address of argument from user's core memory
 11117                              <1> 	;
 11118                              <1> 	; INPUT:
 11119                              <1> 	;	esi = virtual address of argument pointer
 11120                              <1> 	; OUTPUT:
 11121                              <1> 	;	eax = virtual address of argument
 11122                              <1> 	;
 11123                              <1> 	; Modified registers: EAX, EBX, ECX, EDX, ESI 
 11124                              <1> 	;
 11125 000106B6 833D[BC030300]00    <1>  	cmp     dword [u.ppgdir], 0 ; /etc/init ?
 11126                              <1> 				    ; (the caller is kernel)
 11127 000106BD 7667                <1>         jna     short get_argpk 
 11128                              <1> 	;
 11129 000106BF 89F3                <1>      	mov	ebx, esi
 11130 000106C1 E8185CFFFF          <1> 	call	get_physical_addr ; get physical address
 11131 000106C6 0F8289000000        <1>         jc      get_argp_err
 11132 000106CC A3[44040300]        <1> 	mov 	[nbase], eax ; physical address	
 11133 000106D1 66890D[48040300]    <1> 	mov	[ncount], cx ; remain byte count in page (1-4096)
 11134 000106D8 B804000000          <1> 	mov	eax, 4 ; 21/07/2015
 11135 000106DD 6639C1              <1> 	cmp	cx, ax ; 4
 11136 000106E0 735D                <1> 	jnb	short get_argp2
 11137 000106E2 89F3                <1> 	mov	ebx, esi
 11138 000106E4 01CB                <1> 	add	ebx, ecx
 11139 000106E6 E8F35BFFFF          <1> 	call	get_physical_addr ; get physical address
 11140 000106EB 7268                <1> 	jc	short get_argp_err
 11141                              <1> 	;push	esi
 11142 000106ED 89C6                <1> 	mov	esi, eax
 11143 000106EF 66870D[48040300]    <1> 	xchg	cx, [ncount]
 11144 000106F6 8735[44040300]      <1> 	xchg	esi, [nbase]
 11145 000106FC B504                <1> 	mov	ch, 4
 11146 000106FE 28CD                <1> 	sub	ch, cl
 11147                              <1> get_argp0:
 11148 00010700 AC                  <1> 	lodsb
 11149 00010701 6650                <1> 	push	ax
 11150 00010703 FEC9                <1> 	dec	cl
 11151 00010705 75F9                <1>         jnz     short get_argp0
 11152 00010707 8B35[44040300]      <1> 	mov	esi, [nbase]
 11153                              <1> 	; 21/07/2015
 11154 0001070D 0FB6C5              <1> 	movzx	eax, ch
 11155 00010710 0105[44040300]      <1> 	add	[nbase], eax
 11156 00010716 662905[48040300]    <1> 	sub	[ncount], ax
 11157                              <1> get_argp1:
 11158 0001071D AC                  <1> 	lodsb
 11159 0001071E FECD                <1> 	dec	ch
 11160 00010720 7447                <1>         jz      short get_argp3
 11161 00010722 6650                <1>         push	ax
 11162 00010724 EBF7                <1> 	jmp     short get_argp1
 11163                              <1> get_argpk:
 11164                              <1> 	; Argument is in kernel's memory space
 11165 00010726 66C705[48040300]00- <1> 	mov	word [ncount], PAGE_SIZE ; 4096
 11165 0001072E 10                  <1>
 11166 0001072F 8935[44040300]      <1> 	mov	[nbase], esi
 11167 00010735 8305[44040300]04    <1> 	add	dword [nbase], 4
 11168 0001073C 8B06                <1> 	mov	eax, [esi] ; virtual addr. = physical addr.
 11169 0001073E C3                  <1> 	retn
 11170                              <1> get_argp2:
 11171                              <1> 	; 21/07/2015
 11172                              <1> 	;mov	eax, 4
 11173 0001073F 8B15[44040300]      <1> 	mov 	edx, [nbase] ; 18/10/2015
 11174 00010745 0105[44040300]      <1> 	add	[nbase], eax
 11175 0001074B 662905[48040300]    <1> 	sub	[ncount], ax
 11176                              <1> 	;
 11177 00010752 8B02                <1> 	mov	eax, [edx]
 11178 00010754 C3                  <1> 	retn
 11179                              <1> get_argp_err:
 11180 00010755 A3[C8030300]        <1> 	mov	[u.error], eax
 11181                              <1> 	; 14/11/2017
 11182 0001075A B801000000          <1> 	mov	eax, ERR_BAD_CMD_ARG ; 01h ; TRDOS 8086
 11183 0001075F A3[64030300]        <1> 	mov	[u.r0], eax
 11184 00010764 E963D1FFFF          <1> 	jmp	error
 11185                              <1> get_argp3:
 11186 00010769 B103                <1> 	mov	cl, 3
 11187                              <1> get_argp4:
 11188 0001076B C1E008              <1> 	shl	eax, 8
 11189 0001076E 665A                <1> 	pop	dx
 11190 00010770 88D0                <1> 	mov 	al, dl
 11191 00010772 E2F7                <1>         loop    get_argp4
 11192                              <1> 	;pop	esi
 11193 00010774 C3                  <1> 	retn	
 11194                              <1> 
 11195                              <1> sysstat: 
 11196                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
 11197                              <1> 	; temporary !
 11198 00010775 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
 11199 0001077A A3[C8030300]        <1>         mov     [u.error], eax
 11200 0001077F A3[64030300]        <1>         mov     [u.r0], eax 
 11201 00010784 E943D1FFFF          <1> 	jmp	error
 11202                              <1> 
 11203                              <1> sysfstat: 
 11204                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
 11205                              <1> 	; temporary !
 11206 00010789 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
 11207 0001078E A3[C8030300]        <1>         mov     [u.error], eax
 11208 00010793 A3[64030300]        <1>         mov     [u.r0], eax 
 11209 00010798 E92FD1FFFF          <1> 	jmp	error
 11210                              <1> 
 11211                              <1> fclose:
 11212                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
 11213                              <1> 	;
 11214                              <1> 	; 18/06/2015 (Retro UNIX 386 v1 - Beginning)
 11215                              <1> 	;            (32 bit offset pointer modification)
 11216                              <1> 	; 19/04/2013 - 12/01/2014 (Retro UNIX 8086 v1)
 11217                              <1> 	;
 11218                              <1> 	; Given the file descriptor (index to the u.fp list)
 11219                              <1> 	; 'fclose' first gets the i-number of the file via 'getf'.
 11220                              <1> 	; If i-node is active (i-number > 0) the entry in 
 11221                              <1> 	; u.fp list is cleared. If all the processes that opened
 11222                              <1> 	; that file close it, then fsp etry is freed and the file
 11223                              <1> 	; is closed. If not a return is taken. 
 11224                              <1> 	; If the file has been deleted while open, 'anyi' is called
 11225                              <1> 	; to see anyone else has it open, i.e., see if it is appears
 11226                              <1> 	; in another entry in the fsp table. Upon return from 'anyi'
 11227                              <1> 	; a check is made to see if the file is special.	
 11228                              <1> 	;
 11229                              <1> 	; INPUTS ->
 11230                              <1> 	;    r1 - contains the file descriptor (value=0,1,2...)
 11231                              <1> 	;    u.fp - list of entries in the fsp table
 11232                              <1> 	;    fsp - table of entries (4 words/entry) of open files.	 
 11233                              <1> 	; OUTPUTS ->
 11234                              <1> 	;    r1 - contains the same file descriptor
 11235                              <1> 	;    r2 - contains i-number
 11236                              <1> 	;
 11237                              <1> 	; ((AX = R1))
 11238                              <1> 	; ((Modified registers: eDX, eBX, eCX, eSI, eDI, eBP))
 11239                              <1> 	;
 11240                              <1> 	; Retro UNIX 8086 v1 modification : CF = 1
 11241                              <1> 	;              if i-number of the file is 0. (error)  	
 11242                              <1> 	;
 11243                              <1> 	; TRDOS 386 (06/10/2016)
 11244                              <1> 	; 
 11245                              <1> 	; INPUT:
 11246                              <1> 	;	EAX = File Handle (File Descriptor, File Index)
 11247                              <1> 	;
 11248                              <1> 	; OUTPUT:
 11249                              <1> 	;	CF = 1 -> File not open !
 11250                              <1> 	;	CF = 0 -> OK!
 11251                              <1> 	;	     EBX = File Number (System)
 11252                              <1> 	;	     [cdev] = Logical DOS Drive Number
 11253                              <1> 	;	     EAX = File Handle/Number (user) 	
 11254                              <1> 	;
 11255                              <1> 	; Modified Registers: EBX
 11256                              <1> 
 11257 0001079D 50                  <1> 	push	eax ; File handle
 11258                              <1> 	
 11259 0001079E E846000000          <1> 	call	getf
 11260 000107A3 0F8245240000        <1> 	jc	device_close ; eax = device number
 11261                              <1> 
 11262 000107A9 80BB[B6910100]01    <1> 	cmp	byte [ebx+OF_MODE], 1 ; open mode ; 0 = empty entry
 11263 000107B0 722E                <1> 	jb	short fclose_1	      ; 1 = read, 2 = write
 11264                              <1> 	
 11265 000107B2 83F801              <1> 	cmp	eax, 1 ; is the first cluster number > 0
 11266 000107B5 7229                <1> 	jb	short fclose_1 ; no, this is empty entry
 11267                              <1> 
 11268                              <1> fclose_0:
 11269 000107B7 FE8B[CA910100]      <1> 	dec	byte [ebx+OF_OPENCOUNT] ; decrement the number of processes 
 11270                              <1> 			                ; that have opened the file
 11271 000107BD 7921                <1> 	jns	short fclose_1 ; jump if not negative (jump if bit 7 is 0)	 
 11272                              <1> 			; if all processes haven't closed the file, return
 11273                              <1> 	;
 11274                              <1> 	; eax ; First cluster
 11275 000107BF 31C0                <1> 	xor	eax, eax ; 0
 11276 000107C1 8883[B6910100]      <1> 	mov	[ebx+OF_MODE], al ; 0 = empty entry
 11277                              <1> 	;mov	[ebx+OF_STATUS], al ; 0 = empty entry
 11278 000107C7 66C1E302            <1> 	shl	bx, 2 
 11279 000107CB 8983[84910100]      <1> 	mov	[ebx+OF_FCLUSTER], eax ; 0
 11280 000107D1 8983[9C920100]      <1> 	mov	[ebx+OF_CCLUSTER], eax ; 0
 11281                              <1> 	;mov	[ebx+OF_CCINDEX], eax ; 0
 11282 000107D7 A3[74030300]        <1> 	mov	[u.fofp], eax ; 0
 11283 000107DC 66C1EB02            <1> 	shr	bx, 2
 11284                              <1> fclose_1: ; 1:
 11285 000107E0 58                  <1> 	pop	eax ; File handle (File Descriptor, File Index)
 11286 000107E1 C680[6A030300]00    <1> 	mov	byte [eax+u.fp], 0 ; clear that entry in the u.fp list
 11287 000107E8 C3                  <1> 	retn
 11288                              <1> 
 11289                              <1> getf:
 11290                              <1> 	; 12/10/2016
 11291                              <1> 	; 11/10/2016
 11292                              <1> 	; 08/10/2016
 11293                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
 11294                              <1> 	; / get the device number and the i-number of an open file
 11295                              <1> 	; 13/05/2015
 11296                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
 11297                              <1> 	; 19/04/2013 - 18/11/2013 (Retro UNIX 8086 v1)
 11298                              <1> 	;
 11299 000107E9 89C3                <1> 	mov	ebx, eax
 11300                              <1> getf1: 
 11301 000107EB 83FB0A              <1> 	cmp	ebx, 10
 11302 000107EE 730A                <1>         jnb	short getf2
 11303 000107F0 8A9B[6A030300]      <1> 	mov	bl, [ebx+u.fp]
 11304 000107F6 08DB                <1> 	or	bl, bl
 11305 000107F8 7503                <1> 	jnz	short getf3
 11306                              <1> getf2:
 11307                              <1> 	; 'File not open !' error (ax=0)
 11308 000107FA 29C0                <1> 	sub	eax, eax
 11309 000107FC C3                  <1> 	retn
 11310                              <1> getf3:	
 11311 000107FD F6C380              <1> 	test	bl, 80h
 11312 00010800 7530                <1> 	jnz	short getf5 ; device
 11313 00010802 FECB                <1> 	dec	bl ; 0 based
 11314 00010804 8A83[AC910100]      <1> 	mov	al, [ebx+OF_DRIVE]
 11315 0001080A A2[46030300]        <1> 	mov	[cdev], al
 11316 0001080F C0E302              <1> 	shl	bl, 2 ; *4 (dword offset)
 11317 00010812 8B83[FC910100]      <1> 	mov	eax, [ebx+OF_SIZE]
 11318 00010818 A3[55040300]        <1> 	mov	[i.size], eax ; file size
 11319 0001081D 8D83[D4910100]      <1> 	lea	eax, [ebx+OF_POINTER] ;12/10/2016
 11320 00010823 A3[74030300]        <1> 	mov	[u.fofp], eax
 11321 00010828 8B83[84910100]      <1> 	mov	eax, [ebx+OF_FCLUSTER]
 11322 0001082E C0EB02              <1> 	shr	bl, 2 ; /4 (byte offset) 
 11323                              <1> getf4:
 11324 00010831 C3                  <1> 	retn
 11325                              <1> getf5: 
 11326                              <1> 	; get device number
 11327 00010832 80E37F              <1> 	and	bl, 7Fh ; 1 to 7Fh
 11328 00010835 FECB                <1> 	dec	bl ; 0 based (0 to 7Eh)
 11329 00010837 8A83[DE8F0100]      <1> 	mov	al, [ebx+DEV_DRIVER]
 11330 0001083D 8AAB[488F0100]      <1> 	mov	ch, [ebx+DEV_ACCESS]
 11331 00010843 8A8B[FC8F0100]      <1> 	mov	cl, [ebx+DEV_OPENMODE]
 11332 00010849 80E5FE              <1> 	and	ch, 0FEh ; reset bit 0 ; dev_close
 11333 0001084C F9                  <1> 	stc ; cf = 1 
 11334 0001084D C3                  <1> 	retn	
 11335                              <1> 
 11336                              <1> trans_addr_nmbp:
 11337                              <1> 	; 18/10/2015
 11338                              <1> 	; 12/10/2015
 11339 0001084E 8B2D[7C030300]      <1> 	mov 	ebp, [u.namep]
 11340                              <1> trans_addr_nm: 
 11341                              <1> 	; Convert virtual (pathname) address to physical address
 11342                              <1> 	; (Retro UNIX 386 v1 feature only !)
 11343                              <1> 	; 18/10/2015
 11344                              <1> 	; 12/10/2015 (u.pnbase & u.pncount has been removed from code)
 11345                              <1> 	; 02/07/2015
 11346                              <1> 	; 17/06/2015
 11347                              <1> 	; 16/06/2015
 11348                              <1> 	;
 11349                              <1> 	; INPUTS: 
 11350                              <1> 	;	ebp = pathname address (virtual) ; [u.namep]
 11351                              <1> 	;	[u.pgdir] = user's page directory
 11352                              <1> 	; OUTPUT:
 11353                              <1> 	;       esi = physical address of the pathname
 11354                              <1> 	;	ecx = remain byte count in the page
 11355                              <1> 	;
 11356                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, ESI)
 11357                              <1> 	;
 11358 00010854 833D[BC030300]00    <1>         cmp     dword [u.ppgdir], 0  ; /etc/init ? (sysexec)
 11359 0001085B 7618                <1> 	jna	short trans_addr_nmk ; the caller is os kernel;
 11360                              <1> 				     ; it is already physical address
 11361 0001085D 50                  <1>    	push	eax	
 11362 0001085E 89EB                <1> 	mov	ebx, ebp ; [u.namep] ; pathname address (virtual)
 11363 00010860 E8795AFFFF          <1>        	call	get_physical_addr ; get physical address
 11364 00010865 7204                <1> 	jc	short tr_addr_nm_err
 11365                              <1> 	; 18/10/2015
 11366                              <1> 	; eax = physical address 
 11367                              <1> 	; cx = remain byte count in page (1-4096) 
 11368                              <1> 		; 12/10/2015 (cx = [u.pncount])
 11369 00010867 89C6                <1> 	mov	esi, eax ; 12/10/2015 (esi=[u.pnbase])
 11370 00010869 58                  <1> 	pop	eax 
 11371 0001086A C3                  <1> 	retn
 11372                              <1> 
 11373                              <1> tr_addr_nm_err:
 11374 0001086B A3[C8030300]        <1> 	mov	[u.error], eax
 11375                              <1> 	;pop 	eax
 11376 00010870 E957D0FFFF          <1> 	jmp	error
 11377                              <1> 
 11378                              <1> trans_addr_nmk:
 11379                              <1> 	; 12/10/2015
 11380                              <1> 	; 02/07/2015
 11381 00010875 8B35[7C030300]      <1> 	mov	esi, [u.namep]  ; [u.pnbase]
 11382 0001087B 66B90010            <1> 	mov	cx, PAGE_SIZE ; 4096 ; [u.pncount]
 11383 0001087F C3                  <1> 	retn
 11384                              <1> 
 11385                              <1> sysbreak:
 11386                              <1> 	; 18/10/2015
 11387                              <1> 	; 07/10/2015
 11388                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
 11389                              <1> 	; 20/06/2013 - 24/03/2014 (Retro UNIX 8086 v1)
 11390                              <1> 	;
 11391                              <1> 	; 'sysbreak' sets the programs break points. 
 11392                              <1> 	; It checks the current break point (u.break) to see if it is
 11393                              <1> 	; between "core" and the stack (sp). If it is, it is made an
 11394                              <1> 	; even address (if it was odd) and the area between u.break
 11395                              <1> 	; and the stack is cleared. The new breakpoint is then put
 11396                              <1> 	; in u.break and control is passed to 'sysret'.
 11397                              <1> 	;
 11398                              <1> 	; Calling sequence:
 11399                              <1> 	;	sysbreak; addr
 11400                              <1> 	; Arguments: -
 11401                              <1> 	;	
 11402                              <1> 	; Inputs: u.break - current breakpoint
 11403                              <1> 	; Outputs: u.break - new breakpoint 
 11404                              <1> 	;	area between old u.break and the stack (sp) is cleared.
 11405                              <1> 	; ...............................................................
 11406                              <1> 	;	
 11407                              <1> 	; Retro UNIX 8086 v1 modification:
 11408                              <1> 	;	The user/application program puts breakpoint address
 11409                              <1> 	;       in BX register as 'sysbreak' system call argument.
 11410                              <1> 	; 	(argument transfer method 1)
 11411                              <1> 	;
 11412                              <1> 	;  NOTE: Beginning of core is 0 in Retro UNIX 8086 v1 !
 11413                              <1> 	; 	((!'sysbreak' is not needed in Retro UNIX 8086 v1!))
 11414                              <1> 	;  NOTE:
 11415                              <1> 	; 	'sysbreak' clears extended part (beyond of previous
 11416                              <1> 	;	'u.break' address) of user's memory for original unix's
 11417                              <1> 	;	'bss' compatibility with Retro UNIX 8086 v1 (19/11/2013)
 11418                              <1> 
 11419                              <1> 		; mov u.break,r1 / move users break point to r1
 11420                              <1> 		; cmp r1,$core / is it the same or lower than core?
 11421                              <1> 		; blos 1f / yes, 1f
 11422                              <1> 	; 23/06/2015
 11423 00010880 8B2D[90030300]      <1> 	mov	ebp, [u.break] ; virtual address (offset)
 11424                              <1> 	;and	ebp, ebp
 11425                              <1> 	;jz	short sysbreak_3 
 11426                              <1> 	; Retro UNIX 386 v1 NOTE: u.break points to virtual address !!!
 11427                              <1> 	; (Even break point address is not needed for Retro UNIX 386 v1)
 11428 00010886 8B15[5C030300]      <1> 	mov	edx, [u.sp] ; kernel stack at the beginning of sys call
 11429 0001088C 83C20C              <1> 	add	edx, 12 ; EIP -4-> CS -4-> EFLAGS -4-> ESP (user) 
 11430                              <1> 	; 07/10/2015
 11431 0001088F 891D[90030300]      <1> 	mov	[u.break], ebx ; virtual address !!!
 11432                              <1> 	;
 11433 00010895 3B1A                <1> 	cmp	ebx, [edx] ; compare new break point with 
 11434                              <1> 			   ; with top of user's stack (virtual!)
 11435 00010897 7323                <1> 	jnb	short sysbreak_3
 11436                              <1> 		; cmp r1,sp / is it the same or higher 
 11437                              <1> 			  ; / than the stack?
 11438                              <1> 		; bhis 1f / yes, 1f
 11439 00010899 89DE                <1> 	mov	esi, ebx
 11440 0001089B 29EE                <1> 	sub	esi, ebp ; new break point - old break point
 11441 0001089D 761D                <1> 	jna	short sysbreak_3 
 11442                              <1> 	;push	ebx
 11443                              <1> sysbreak_1:
 11444 0001089F 89EB                <1> 	mov	ebx, ebp  
 11445 000108A1 E8385AFFFF          <1> 	call	get_physical_addr ; get physical address
 11446 000108A6 72C3                <1> 	jc	tr_addr_nm_err
 11447                              <1> 	; 18/10/2015
 11448 000108A8 89C7                <1> 	mov	edi, eax 
 11449 000108AA 29C0                <1> 	sub	eax, eax ; 0
 11450                              <1> 		 ; ECX = remain byte count in page (1-4096)
 11451 000108AC 39CE                <1> 	cmp	esi, ecx
 11452 000108AE 7302                <1> 	jnb	short sysbreak_2
 11453 000108B0 89F1                <1> 	mov	ecx, esi
 11454                              <1> sysbreak_2:
 11455 000108B2 29CE                <1> 	sub	esi, ecx
 11456 000108B4 01CD                <1> 	add	ebp, ecx
 11457 000108B6 F3AA                <1> 	rep 	stosb
 11458 000108B8 09F6                <1> 	or	esi, esi
 11459 000108BA 75E3                <1> 	jnz	short sysbreak_1
 11460                              <1> 	;
 11461                              <1> 		; bit $1,r1 / is it an odd address
 11462                              <1> 		; beq 2f / no, its even
 11463                              <1> 		; clrb (r1)+ / yes, make it even
 11464                              <1> 	; 2: / clear area between the break point and the stack
 11465                              <1> 		; cmp r1,sp / is it higher or same than the stack
 11466                              <1> 		; bhis 1f / yes, quit
 11467                              <1> 		; clr (r1)+ / clear word
 11468                              <1> 		; br 2b / go back
 11469                              <1> 	;pop	ebx
 11470                              <1> sysbreak_3: ; 1:
 11471                              <1> 	;mov	[u.break], ebx ; virtual address !!!
 11472                              <1> 		; jsr r0,arg; u.break / put the "address" 
 11473                              <1> 			; / in u.break (set new break point)
 11474                              <1> 		; br sysret4 / br sysret
 11475 000108BC E92BD0FFFF          <1> 	jmp	sysret
 11476                              <1> 
 11477                              <1> sysseek: ; / moves read write pointer in an fsp entry
 11478                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0)
 11479                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
 11480                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
 11481                              <1> 	;
 11482                              <1> 	; 'sysseek' changes the r/w pointer of (3rd word of in an
 11483                              <1> 	; fsp entry) of an open file whose file descriptor is in u.r0.
 11484                              <1> 	; The file descriptor refers to a file open for reading or
 11485                              <1> 	; writing. The read (or write) pointer is set as follows:
 11486                              <1> 	;	* if 'ptrname' is 0, the pointer is set to offset.
 11487                              <1> 	;	* if 'ptrname' is 1, the pointer is set to its
 11488                              <1> 	;	  current location plus offset.
 11489                              <1> 	;	* if 'ptrname' is 2, the pointer is set to the
 11490                              <1> 	;	  size of file plus offset.
 11491                              <1> 	; The error bit (e-bit) is set for an undefined descriptor.
 11492                              <1> 	;
 11493                              <1> 	; Calling sequence:
 11494                              <1> 	;	sysseek; offset; ptrname
 11495                              <1> 	; Arguments:
 11496                              <1> 	;	offset - number of bytes desired to move 
 11497                              <1> 	;		 the r/w pointer
 11498                              <1> 	;	ptrname - a switch indicated above
 11499                              <1> 	;
 11500                              <1> 	; Inputs: r0 - file descriptor 
 11501                              <1> 	; Outputs: -
 11502                              <1> 	; ...............................................................
 11503                              <1> 	;	
 11504                              <1> 	; Retro UNIX 8086 v1 modification: 
 11505                              <1> 	;       'sysseek' system call has three arguments; so,
 11506                              <1> 	;	* 1st argument, file descriptor is in BX (BL) register
 11507                              <1> 	;	* 2nd argument, offset is in CX register
 11508                              <1> 	;	* 3rd argument, ptrname/switch is in DX (DL) register	
 11509                              <1> 
 11510 000108C1 E821000000          <1> 	call	seektell
 11511                              <1> 	; EAX = Current R/W pointer of the file
 11512                              <1> 	; EBX = [u.fofp]
 11513                              <1> 	; [u.base] = offset (ECX input)
 11514                              <1> 
 11515 000108C6 0305[84030300]      <1> 	add	eax, [u.base]
 11516 000108CC 8903                <1> 	mov	[ebx], eax
 11517 000108CE E919D0FFFF          <1> 	jmp	sysret
 11518                              <1> 
 11519                              <1> systell: ; / get the r/w pointer
 11520                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0) - temporary !-
 11521                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
 11522                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
 11523                              <1> 	;
 11524                              <1> 	; Retro UNIX 8086 v1 modification:
 11525                              <1> 	; ! 'systell' does not work in original UNIX v1,
 11526                              <1> 	; 	    it returns with error !
 11527                              <1> 	; Inputs: r0 - file descriptor 
 11528                              <1> 	; Outputs: r0 - file r/w pointer
 11529                              <1> 
 11530                              <1> 	;xor	ecx, ecx ; 0
 11531 000108D3 BA01000000          <1> 	mov	edx, 1 ; 05/08/2013
 11532                              <1> 	;call 	seektell
 11533 000108D8 E810000000          <1> 	call 	seektell0 ; 05/08/2013
 11534                              <1> 	;; 06/11/2016
 11535                              <1> 	;; mov	eax, [ebx]
 11536 000108DD A3[64030300]        <1> 	mov	[u.r0], eax
 11537 000108E2 E905D0FFFF          <1> 	jmp	sysret
 11538                              <1> 
 11539                              <1> ; Original unix v1 'systell' system call:
 11540                              <1> 		; jsr r0,seektell
 11541                              <1> 		; br error4
 11542                              <1> 
 11543                              <1> seektell:
 11544                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0)
 11545                              <1> 	; 03/01/2016
 11546                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
 11547                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
 11548                              <1> 	;
 11549                              <1> 	; 'seektell' puts the arguments from sysseek and systell
 11550                              <1> 	; call in u.base and u.count. It then gets the i-number of
 11551                              <1> 	; the file from the file descriptor in u.r0 and by calling
 11552                              <1> 	; getf. The i-node is brought into core and then u.count
 11553                              <1> 	; is checked to see it is a 0, 1, or 2.
 11554                              <1> 	; If it is 0 - u.count stays the same
 11555                              <1> 	;          1 - u.count = offset (u.fofp)
 11556                              <1> 	;	   2 - u.count = i.size (size of file)
 11557                              <1> 	; 	 		
 11558                              <1> 	; !! Retro UNIX 8086 v1 modification:
 11559                              <1> 	;	Argument 1, file descriptor is in BX;
 11560                              <1> 	;	Argument 2, offset is in CX;
 11561                              <1> 	;	Argument 3, ptrname/switch is in DX register.	
 11562                              <1> 	;
 11563                              <1> 	; ((Return -> eax = base for offset (position= base+offset))
 11564                              <1> 	;
 11565 000108E7 890D[84030300]      <1> 	mov 	[u.base], ecx ; offset
 11566                              <1> seektell0:
 11567 000108ED 8915[88030300]      <1> 	mov 	[u.count], edx
 11568                              <1> 	; EBX = file descriptor (file number)
 11569 000108F3 E8F3FEFFFF          <1> 	call	getf1
 11570                              <1> 	; EAX = First cluster of the file
 11571                              <1> 	; EBX = File number (Open file number)
 11572                              <1> 	; [u.fofp] = Pointer to File pointer
 11573                              <1> 	; [i.size] = File size
 11574                              <1> 
 11575 000108F8 09C0                <1> 	or	eax, eax
 11576 000108FA 7514                <1> 	jnz	short seektell1
 11577                              <1> 
 11578 000108FC B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN
 11579 00010901 A3[64030300]        <1> 	mov	[u.r0], eax 
 11580 00010906 A3[C8030300]        <1> 	mov	dword [u.error], eax ; 'file not open !'
 11581 0001090B E9BCCFFFFF          <1> 	jmp	error
 11582                              <1> 
 11583                              <1> seektell1:
 11584 00010910 8B1D[74030300]      <1>         mov     ebx, [u.fofp]
 11585 00010916 803D[88030300]01    <1> 	cmp	byte [u.count], 1
 11586 0001091D 7705                <1> 	ja	short seektell2
 11587 0001091F 7409                <1> 	je	short seektell3
 11588 00010921 31C0                <1> 	xor	eax, eax
 11589 00010923 C3                  <1> 	retn
 11590                              <1> 
 11591                              <1> seektell2:
 11592 00010924 A1[55040300]        <1>         mov   	eax, [i.size]
 11593 00010929 C3                  <1> 	retn
 11594                              <1> 
 11595                              <1> seektell3:
 11596 0001092A 8B03                <1> 	mov	eax, [ebx]
 11597 0001092C C3                  <1> 	retn
 11598                              <1> 
 11599                              <1> sysintr: ; / set interrupt handling
 11600                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
 11601                              <1> 	; 07/07/2013 (Retro UNIX 8086 v1)
 11602                              <1> 	;
 11603                              <1> 	; 'sysintr' sets the interrupt handling value. It puts
 11604                              <1> 	; argument of its call in u.intr then branches into 'sysquit'
 11605                              <1> 	; routine. u.tty is checked if to see if a control tty exists.
 11606                              <1> 	; If one does the interrupt character in the tty buffer is
 11607                              <1> 	; cleared and 'sysret'is called. If one does not exits
 11608                              <1> 	; 'sysret' is just called.	
 11609                              <1> 	;
 11610                              <1> 	; Calling sequence:
 11611                              <1> 	;	sysintr; arg
 11612                              <1> 	; Argument:
 11613                              <1> 	;	arg - if 0, interrupts (ASCII DELETE) are ignored.
 11614                              <1> 	;	    - if 1, intterupts cause their normal result
 11615                              <1> 	;		 i.e force an exit.
 11616                              <1> 	;	    - if arg is a location within the program,
 11617                              <1> 	;		control is passed to that location when
 11618                              <1> 	;		an interrupt occurs.	
 11619                              <1> 	; Inputs: -
 11620                              <1> 	; Outputs: -
 11621                              <1> 	; ...............................................................
 11622                              <1> 	;	
 11623                              <1> 	; Retro UNIX 8086 v1 modification: 
 11624                              <1> 	;       'sysintr' system call sets u.intr to value of BX
 11625                              <1> 	;	then branches into sysquit.
 11626                              <1> 	;
 11627 0001092D 66891D[AA030300]    <1> 	mov	[u.intr], bx
 11628                              <1> 		; jsr r0,arg; u.intr / put the argument in u.intr
 11629                              <1> 		; br 1f / go into quit routine
 11630 00010934 E9B3CFFFFF          <1> 	jmp	sysret
 11631                              <1> 
 11632                              <1> sysquit:
 11633                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
 11634                              <1> 	; 07/07/2013 (Retro UNIX 8086 v1)
 11635                              <1> 	;
 11636                              <1> 	; 'sysquit' turns off the quit signal. it puts the argument of
 11637                              <1> 	; the call in u.quit. u.tty is checked if to see if a control 
 11638                              <1> 	; tty exists. If one does the interrupt character in the tty
 11639                              <1> 	; buffer is cleared and 'sysret'is called. If one does not exits
 11640                              <1> 	; 'sysret' is just called.	
 11641                              <1> 	;
 11642                              <1> 	; Calling sequence:
 11643                              <1> 	;	sysquit; arg
 11644                              <1> 	; Argument:
 11645                              <1> 	;	arg - if 0, this call diables quit signals from the
 11646                              <1> 	;		typewriter (ASCII FS)
 11647                              <1> 	;	    - if 1, quits are re-enabled and cause execution to
 11648                              <1> 	;		cease and a core image to be produced.
 11649                              <1> 	;		 i.e force an exit.
 11650                              <1> 	;	    - if arg is an addres in the program,
 11651                              <1> 	;		a quit causes control to sent to that
 11652                              <1> 	;		location.	
 11653                              <1> 	; Inputs: -
 11654                              <1> 	; Outputs: -
 11655                              <1> 	; ...............................................................
 11656                              <1> 	;	
 11657                              <1> 	; Retro UNIX 8086 v1 modification: 
 11658                              <1> 	;       'sysquit' system call sets u.quit to value of BX
 11659                              <1> 	;	then branches into 'sysret'.
 11660                              <1> 	;
 11661 00010939 66891D[AC030300]    <1> 	mov	[u.quit], bx
 11662 00010940 E9A7CFFFFF          <1> 	jmp	sysret
 11663                              <1> 		; jsr r0,arg; u.quit / put argument in u.quit
 11664                              <1> 	;1:
 11665                              <1> 		; mov u.ttyp,r1 / move pointer to control tty buffer
 11666                              <1> 			      ; / to r1
 11667                              <1> 		; beq sysret4 / return to user
 11668                              <1> 		; clrb 6(r1) / clear the interrupt character 
 11669                              <1> 			   ; / in the tty buffer
 11670                              <1> 		; br sysret4 / return to user
 11671                              <1> 
 11672                              <1> anyi: 
 11673                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
 11674                              <1> 	; Major Modification!
 11675                              <1> 	; TRDOS 386 does not permit to delete a file while it is open 
 11676                              <1> 	; The role of 'anyi' procedure has beeen changed to ensure that.
 11677                              <1> 	; 	
 11678                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
 11679                              <1> 	; 25/04/2013 (Retro UNIX 8086 v1)
 11680                              <1> 	;
 11681                              <1> 	; 'anyi' is called if a file deleted while open.
 11682                              <1> 	; "anyi" checks to see if someone else has opened this file.
 11683                              <1> 	;
 11684                              <1> 	; INPUTS ->
 11685                              <1> 	;    r1 - contains an i-number
 11686                              <1> 	;    fsp - start of table containing open files
 11687                              <1> 	;
 11688                              <1> 	; OUTPUTS ->
 11689                              <1> 	;    "deleted" flag set in fsp entry of another occurrence of
 11690                              <1> 	;	   this file and r2 points 1st word of this fsp entry.
 11691                              <1> 	;    if file not found - bit in i-node map is cleared
 11692                              <1> 	;    			 (i-node is freed)
 11693                              <1> 	;               all blocks related to i-node are freed
 11694                              <1> 	;	        all flags in i-node are cleared
 11695                              <1> 	; ((AX = R1)) input
 11696                              <1> 	;
 11697                              <1> 	;    (Retro UNIX Prototype : 02/12/2012, UNIXCOPY.ASM)
 11698                              <1>         ;    ((Modified registers: eDX, eCX, eBX, eSI, eDI, eBP))  
 11699                              <1> 	;
 11700                              <1> 	; / r1 contains an i-number
 11701                              <1> 
 11702                              <1> 	; TRDOS 386 (06/10/2016)
 11703                              <1> 	; 
 11704                              <1> 	; INPUT:
 11705                              <1> 	;	EAX = First Cluster
 11706                              <1> 	;	 DL = Logical DOS Drive Number
 11707                              <1> 	;
 11708                              <1> 	; OUTPUT:
 11709                              <1> 	;	CF = 1 -> EBX = File Handle/Number/Index
 11710                              <1> 	;	CF = 0 -> EBX = 0
 11711                              <1> 	;
 11712                              <1> 	; Modified Registers: EBX
 11713                              <1> 
 11714 00010945 31DB                <1> 	xor	ebx, ebx
 11715                              <1> anyi_0: 
 11716 00010947 80BB[B6910100]00    <1> 	cmp	byte [ebx+OF_MODE], 0 ; 0 = empty entry
 11717 0001094E 770A                <1> 	ja	short anyi_2 ; 1 (r), 2 (w) or 3 (r&w)
 11718                              <1> anyi_1:
 11719 00010950 FEC3                <1> 	inc	bl
 11720 00010952 80FB0A              <1> 	cmp	bl, OPENFILES ; max. count of open files
 11721 00010955 72F0                <1> 	jb	short anyi_0
 11722 00010957 31C0                <1> 	xor	eax, eax
 11723 00010959 C3                  <1> 	retn 
 11724                              <1> anyi_2:
 11725 0001095A 3A93[AC910100]      <1> 	cmp	dl, [ebx+OF_DRIVE]
 11726 00010960 75EE                <1> 	jne	short anyi_1
 11727 00010962 66C1E302            <1> 	shl	bx, 2 ; *4 (dword offset)
 11728 00010966 3B83[84910100]      <1> 	cmp	eax, [ebx+OF_FCLUSTER]
 11729 0001096C 7406                <1> 	je	short anyi_3
 11730 0001096E 66C1EB02            <1> 	shr	bx, 2 ; /4 (byte offset)
 11731 00010972 EBDC                <1> 	jmp	short anyi_1 	
 11732                              <1> anyi_3:
 11733 00010974 66C1EB02            <1> 	shr	bx, 2 ; /4 (bytes offset) (index)
 11734 00010978 F9                  <1> 	stc
 11735 00010979 C3                  <1> 	retn
 11736                              <1> 
 11737                              <1> ; Retro UNIX 386 v1 Kernel (v0.2) - SYS9.INC
 11738                              <1> ; Last Modification: 09/12/2015
 11739                              <1> 
 11740                              <1> syssleep:
 11741                              <1> 	; 29/06/2015 - (Retro UNIX 386 v1)
 11742                              <1> 	; 11/06/2014 - (Retro UNIX 8086 v1)
 11743                              <1> 	;
 11744                              <1> 	; Retro UNIX 8086 v1 feature only
 11745                              <1> 	; (INPUT -> none)
 11746                              <1> 	;
 11747 0001097A 0FB61D[B3030300]    <1> 	movzx	ebx, byte [u.uno] ; process number
 11748 00010981 8AA3[7F000300]      <1> 	mov	ah, [ebx+p.ttyc-1] ; current/console tty
 11749 00010987 E881190000          <1> 	call	sleep
 11750 0001098C E95BCFFFFF          <1> 	jmp	sysret
 11751                              <1> 
 11752                              <1> _vp_clr:
 11753                              <1> 	; Reset/Clear Video Page
 11754                              <1> 	;
 11755                              <1> 	; 30/06/2015 - (Retro UNIX 386 v1)
 11756                              <1> 	; 21/05/2013 - 30/10/2013(Retro UNIX 8086 v1) (U0.ASM)
 11757                              <1> 	;
 11758                              <1> 	; Retro UNIX 8086 v1 feature only !
 11759                              <1> 	;
 11760                              <1> 	; INPUTS -> 
 11761                              <1> 	;   BH = video page number	 
 11762                              <1> 	;
 11763                              <1> 	; OUTPUT ->
 11764                              <1> 	;   none
 11765                              <1> 	; ((Modified registers: eAX, BH, eCX, eDX, eSI, eDI))
 11766                              <1> 	;
 11767                              <1> 	; 04/12/2013
 11768 00010991 28C0                <1> 	sub	al, al
 11769                              <1> 	; al = 0 (clear video page)
 11770                              <1> 	; bh = video page ; 13/05/2016
 11771 00010993 B407                <1> 	mov	ah, 07h
 11772                              <1> 	; ah = 7 (attribute/color)
 11773 00010995 6631C9              <1> 	xor 	cx, cx ; 0, left upper column (cl) & row (cl)
 11774 00010998 66BA4F18            <1> 	mov	dx, 184Fh ; right lower column & row (dl=24, dh=79)
 11775 0001099C E89C16FFFF          <1> 	call	_scroll_up
 11776                              <1> 	; bh = video page
 11777 000109A1 6631D2              <1> 	xor	dx, dx ; 0 (cursor position) 
 11778 000109A4 E9EE19FFFF          <1> 	jmp 	_set_cpos
 11779                              <1> 
 11780                              <1> sysmsg:
 11781                              <1> 	; 07/12/2020
 11782                              <1> 	; 05/12/2020
 11783                              <1> 	; 13/05/2016
 11784                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
 11785                              <1> 	; 01/07/2015 - 11/11/2015 (Retro UNIX 386 v1)
 11786                              <1> 	; Print user-application message on user's console tty
 11787                              <1> 	;
 11788                              <1> 	; Input -> EBX = Message address
 11789                              <1> 	;	   ECX = Message length (max. 255)
 11790                              <1> 	;	   DL = Color (IBM PC Rombios color attributes)
 11791                              <1> 	;
 11792 000109A9 81F9FF000000        <1> 	cmp	ecx, MAX_MSG_LEN ; 255
 11793 000109AF 0F8737CFFFFF        <1> 	ja	sysret ; nothing to do with big message size
 11794 000109B5 08C9                <1> 	or	cl, cl
 11795 000109B7 0F842FCFFFFF        <1> 	jz	sysret
 11796 000109BD 20D2                <1> 	and	dl, dl
 11797 000109BF 7502                <1> 	jnz	short sysmsg0
 11798 000109C1 B207                <1> 	mov	dl, 07h ; default color
 11799                              <1> 		; (black background, light gray character) 
 11800                              <1> sysmsg0:
 11801 000109C3 891D[84030300]      <1> 	mov	[u.base], ebx
 11802 000109C9 8815[BF810100]      <1> 	mov	[ccolor], dl ; color attributes
 11803 000109CF 89E5                <1> 	mov	ebp, esp
 11804 000109D1 31DB                <1> 	xor	ebx, ebx ; 0
 11805 000109D3 891D[8C030300]      <1> 	mov	[u.nread], ebx ; 0
 11806                              <1> 	;
 11807 000109D9 381D[C6030300]      <1> 	cmp	[u.kcall], bl ; 0
 11808 000109DF 776F                <1> 	ja	short sysmsgk ; Temporary (01/07/2015)
 11809                              <1> 	;
 11810 000109E1 890D[88030300]      <1> 	mov	[u.count], ecx
 11811                              <1> 	;inc	ecx ; + 00h ; ASCIIZ
 11812                              <1> 	;
 11813                              <1> 	; 07/12/2020
 11814                              <1> 	;add	ecx, 3
 11815 000109E7 6683C103            <1> 	add	cx, 3
 11816 000109EB 80E1FC              <1> 	and	cl, ~3  ; not 3
 11817                              <1> 	;
 11818 000109EE 29CC                <1> 	sub	esp, ecx
 11819 000109F0 89E7                <1> 	mov	edi, esp
 11820 000109F2 89E6                <1> 	mov	esi, esp
 11821 000109F4 66891D[C4030300]    <1> 	mov	[u.pcount], bx ; reset page (phy. addr.) counter
 11822                              <1> 	; 11/11/2015
 11823 000109FB 8A25[94030300]      <1> 	mov 	ah, [u.ttyp] ; recent open tty
 11824                              <1> 	; 0 = none
 11825 00010A01 FECC                <1> 	dec	ah
 11826 00010A03 790C                <1> 	jns	short sysmsg1 
 11827 00010A05 8A1D[B3030300]      <1> 	mov	bl, [u.uno] ; process number	
 11828 00010A0B 8AA3[7F000300]      <1> 	mov	ah, [ebx+p.ttyc-1] ; user's (process's) console tty
 11829                              <1> sysmsg1:
 11830 00010A11 8825[96030300]      <1> 	mov	[u.ttyn], ah
 11831                              <1> sysmsg2:
 11832 00010A17 E848080000          <1> 	call	cpass
 11833 00010A1C 7416                <1> 	jz	short sysmsg5
 11834 00010A1E AA                  <1> 	stosb
 11835 00010A1F 20C0                <1> 	and	al, al
 11836 00010A21 75F4                <1> 	jnz	short sysmsg2
 11837                              <1> sysmsg3:
 11838 00010A23 80FC07              <1> 	cmp	ah, 7 ; tty number
 11839 00010A26 7711                <1> 	ja	short sysmsg6 ; serial port
 11840 00010A28 E83E000000          <1> 	call	print_cmsg ; 05/12/2020
 11841                              <1> sysmsg4:
 11842 00010A2D 89EC                <1> 	mov	esp, ebp	
 11843 00010A2F E9B8CEFFFF          <1> 	jmp	sysret
 11844                              <1> sysmsg5:
 11845 00010A34 C60700              <1> 	mov	byte [edi], 0
 11846 00010A37 EBEA                <1> 	jmp	short sysmsg3
 11847                              <1> sysmsg6:
 11848 00010A39 8A06                <1> 	mov	al, [esi]
 11849 00010A3B E8CD180000          <1> 	call	sndc
 11850 00010A40 72EB                <1> 	jc	short sysmsg4
 11851 00010A42 803E00              <1> 	cmp	byte [esi], 0  ; 0 is stop character
 11852 00010A45 76E6                <1> 	jna	short sysmsg4
 11853 00010A47 46                  <1> 	inc 	esi
 11854 00010A48 8A25[96030300]      <1> 	mov	ah, [u.ttyn]
 11855 00010A4E EBE9                <1> 	jmp	short sysmsg6
 11856                              <1> 
 11857                              <1> sysmsgk: ; Temporary (01/07/2015)
 11858                              <1> 	; The message has been sent by Kernel (ASCIIZ string)
 11859                              <1> 	; (ECX -character count- will not be considered)
 11860 00010A50 8B35[84030300]      <1> 	mov	esi, [u.base]
 11861 00010A56 8A25[BE810100]      <1> 	mov	ah, [ptty] ; present/current screen (video page)
 11862 00010A5C 8825[96030300]      <1> 	mov	[u.ttyn], ah
 11863 00010A62 C605[C6030300]00    <1> 	mov	byte [u.kcall], 0
 11864 00010A69 EBB8                <1> 	jmp	short sysmsg3
 11865                              <1> 	
 11866                              <1> print_cmsg: 
 11867                              <1> 	; 08/12/2020
 11868                              <1> 	; 07/12/2020
 11869                              <1> 	; 05/12/2020
 11870                              <1> 	; 18/11/2017
 11871                              <1> 	; 13/05/2016 - TRDOS 386 (TRDOS v2.0)
 11872                              <1> 	; 01/07/2015 (Retro UNIX 386 v1)
 11873                              <1> 	;
 11874                              <1> 	; print message (on user's console tty) 
 11875                              <1> 	;	with requested color
 11876                              <1> 	;
 11877                              <1> 	; INPUTS:
 11878                              <1> 	;	esi = message address
 11879                              <1> 	;	[u.ttyn] = tty number (0 to 7)
 11880                              <1> 	;	[ccolor] = color attributes (IBM PC BIOS colors)
 11881                              <1> 	;
 11882                              <1> 	; Modified registers: eax, ebx, ecx, edx, esi, edi
 11883                              <1> 	; (ebp must be preserved)
 11884                              <1> 
 11885                              <1> 	;mov	bh, ah
 11886 00010A6B 8A3D[96030300]      <1> 	mov	bh, [u.ttyn]
 11887 00010A71 8A1D[BF810100]      <1> 	mov	bl, [ccolor] ; * ; 05/12/2020
 11888                              <1> 
 11889                              <1> 	; 05/12/2020
 11890 00010A77 803D[1C120300]00    <1> 	cmp	byte [pmi32], 0 ; is vbios's 32 bit pmi enabled ?
 11891 00010A7E 772E                <1> 	ja	short pcmsg5 ; yes
 11892                              <1> pcmsg1:
 11893                              <1> 	; 08/12/2020
 11894 00010A80 8A1D[BF810100]      <1> 	mov	bl, [ccolor] ; * (video.s 'u11'&'beep' change BL)
 11895                              <1> 	
 11896 00010A86 AC                  <1> 	lodsb
 11897 00010A87 20C0                <1> 	and 	al, al  ; 0
 11898 00010A89 743A                <1> 	jz 	short pcmsg2
 11899                              <1> pcmsg7:
 11900 00010A8B 56                  <1> 	push 	esi
 11901                              <1> 	;mov	bl, [ccolor] ; * (video.s 'u11'&'beep' change BL)
 11902                              <1> 	; 05/12/2020
 11903                              <1> 	;;mov	bh, [u.ttyn]
 11904                              <1> 	;call 	_write_tty
 11905                              <1> 	;pop	esi
 11906                              <1> 	;jmp	short pcmsg1
 11907                              <1> ;pcmsg2:
 11908                              <1> 	;retn
 11909                              <1> 
 11910                              <1> 	; 07/12/2020
 11911 00010A8C 803D[BA6F0000]03    <1> 	cmp     byte [CRT_MODE], 3
 11912 00010A93 7708                <1> 	ja 	short pcmsg4
 11913                              <1> pcmsg3:
 11914 00010A95 E87618FFFF          <1> 	call	_write_tty_m3
 11915 00010A9A 5E                  <1> 	pop	esi
 11916 00010A9B EBE3                <1> 	jmp	short pcmsg1
 11917                              <1> pcmsg4:
 11918 00010A9D 803D[BA6F0000]07    <1>         cmp     byte [CRT_MODE], 7
 11919 00010AA4 76EF                <1> 	jna 	short pcmsg3
 11920 00010AA6 E87F25FFFF          <1> 	call	vga_write_teletype
 11921 00010AAB 5E                  <1> 	pop	esi
 11922 00010AAC EBD2                <1> 	jmp	short pcmsg1
 11923                              <1> pcmsg5:
 11924                              <1> 	; 07/12/2020
 11925 00010AAE 803D[BA6F0000]07    <1>         cmp     byte [CRT_MODE], 7
 11926 00010AB5 76C9                <1> 	jna 	short pcmsg1
 11927                              <1> 
 11928                              <1> 	; 05/12/2020
 11929                              <1> 	; writing message by using
 11930                              <1> 	; VESA VBE3 video bios protected mode interface
 11931                              <1> 	
 11932 00010AB7 B40E                <1> 	mov	ah, 0Eh
 11933                              <1> pcmsg6:
 11934 00010AB9 AC                  <1> 	lodsb
 11935 00010ABA 20C0                <1> 	and 	al, al  ; 0
 11936 00010ABC 7407                <1> 	jz 	short pcmsg2
 11937                              <1> 	; bh = video page
 11938                              <1> 	; ah = 0Eh 
 11939                              <1> 	; al = character
 11940                              <1> 	; bl = color
 11941 00010ABE E8470FFFFF          <1> 	call	int10h_32bit_pmi
 11942 00010AC3 EBF4                <1> 	jmp	short pcmsg6
 11943                              <1> pcmsg2:
 11944 00010AC5 C3                  <1> 	retn
 11945                              <1> 
 11946                              <1> sysgeterr:
 11947                              <1> 	; 09/12/2015
 11948                              <1> 	; 21/09/2015 - (Retro UNIX 386 v1 feature only!)
 11949                              <1> 	; Get last error number or page fault count
 11950                              <1> 	; (for debugging)
 11951                              <1> 	;
 11952                              <1> 	; Input -> EBX = return type
 11953                              <1> 	;	   0 = last error code (which is in 'u.error')	
 11954                              <1> 	;	   FFFFFFFFh = page fault count for running process
 11955                              <1> 	;	   FFFFFFFEh = total page fault count
 11956                              <1> 	;	   1 .. FFFFFFFDh = undefined 
 11957                              <1> 	;
 11958                              <1> 	; Output -> EAX = last error number or page fault count
 11959                              <1> 	;	   (depending on EBX input)
 11960                              <1> 	; 	
 11961 00010AC6 21DB                <1> 	and 	ebx, ebx
 11962 00010AC8 750B                <1> 	jnz	short glerr_2
 11963                              <1> glerr_0:
 11964 00010ACA A1[C8030300]        <1> 	mov	eax, [u.error]
 11965                              <1> glerr_1:
 11966 00010ACF A3[64030300]        <1> 	mov	[u.r0], eax
 11967 00010AD4 C3                  <1>  	retn
 11968                              <1> glerr_2:
 11969 00010AD5 43                  <1> 	inc	ebx ; FFFFFFFFh -> 0, FFFFFFFEh -> FFFFFFFFh
 11970 00010AD6 74FD                <1> 	jz	short glerr_2 ; page fault count for process
 11971 00010AD8 43                  <1> 	inc	ebx ; FFFFFFFFh -> 0	
 11972 00010AD9 75EF                <1> 	jnz	short glerr_0
 11973 00010ADB A1[80050300]        <1> 	mov	eax, [PF_Count] ; total page fault count
 11974 00010AE0 EBED                <1>         jmp     short glerr_1
 11975                              <1> glerr_3:
 11976 00010AE2 A1[CC030300]        <1> 	mov 	eax, [u.pfcount]
 11977 00010AE7 EBE6                <1> 	jmp	short glerr_1
 11978                              <1> 
 11979                              <1> load_and_run_file:
 11980                              <1> 	; 18/11/2017
 11981                              <1> 	; 22/01/2017
 11982                              <1> 	; 04/01/2017, 07/01/2017
 11983                              <1> 	; 24/10/2016
 11984                              <1> 	; 24/04/2016, 02/05/2016, 03/05/2016, 06/05/2016
 11985                              <1> 	; 23/04/2016 (TRDOS 386 = TRDOS v2.0)
 11986                              <1> 	; 23/10/2015 (Retro UNIX 386 v1, 'sysexec')
 11987                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
 11988                              <1> 	; 03/06/2013 - 06/12/2013 (Retro UNIX 8086 v1)
 11989                              <1> 	; EAX = First Cluster number
 11990                              <1> 	; EDX = File Size
 11991                              <1> 	; ESI = Argument list address
 11992                              <1> 	; [argc] = argument count
 11993                              <1> 	; [u.nread] = argument list length
 11994                              <1> 	; [esp] = return address to the caller (*)
 11995                              <1> 	;
 11996 00010AE9 8935[4C040300]      <1> 	mov	[argv], esi
 11997 00010AEF 8915[55040300]      <1> 	mov	[i.size], edx
 11998 00010AF5 A3[51040300]        <1> 	mov	[ii], eax
 11999                              <1> 
 12000                              <1> 	;sti	; 07/01/2017
 12001                              <1> 	;mov	eax, [k_page_dir]
 12002                              <1> 	;mov	[u.pgdir], eax
 12003 00010AFA 31C0                <1> 	xor 	eax, eax ; clc ; *** ; 04/01/2017
 12004                              <1> 	;mov	[u.r0], eax ; 0 ; 07/01/2017
 12005                              <1> 
 12006                              <1> 	; 06/05/2016
 12007                              <1> 	; Set 'sysexit' return order to MainProg
 12008                              <1> 	;
 12009 00010AFC 58                  <1> 	pop	eax ; * 'loc_load_and_run_file_8:' address
 12010                              <1> 	;; 22/01/2017
 12011                              <1> 	;;cli ; 07/01/2017
 12012 00010AFD 8B25[2C810100]      <1> 	mov	esp, [tss.esp0]
 12013                              <1> 	;
 12014                              <1> 	; 'loc_load_run_file_8' address has 
 12015                              <1> 	; 'jmp loc_file_rw_restore_retn' instruction
 12016                              <1> 	; 'loc_file_rw_restore_retn:' will return to
 12017                              <1> 	; [mainprog_return_addr] 
 12018                              <1> 	; just after 'call command_interpreter'
 12019                              <1> 	;
 12020 00010B03 68[23750000]        <1> 	push	_end_of_mainprog ; we must not return to here !
 12021 00010B08 FF35[108E0100]      <1> 	push	dword [mainprog_return_addr]
 12022 00010B0E 89E5                <1> 	mov	ebp, esp ; **
 12023                              <1> 	;	
 12024 00010B10 9C                  <1> 	pushfd  ; EFLAGS      ; IRETD ; ***
 12025 00010B11 6A08                <1> 	push	KCODE ; cs    ; IRETD
 12026 00010B13 50                  <1> 	push	eax ; * (eip) ; IRETD
 12027 00010B14 8925[5C030300]      <1> 	mov	[u.sp], esp
 12028                              <1> 	;mov	byte [u.quant], time_count
 12029 00010B1A 1E                  <1> 	push	ds
 12030 00010B1B 06                  <1> 	push	es
 12031 00010B1C 0FA0                <1> 	push	fs
 12032 00010B1E 0FA8                <1> 	push	gs	
 12033                              <1> 	;mov	eax, [u.r0]
 12034 00010B20 29C0                <1> 	sub	eax, eax
 12035 00010B22 60                  <1> 	pushad
 12036 00010B23 68[ECD80000]        <1> 	push	sysret
 12037                              <1> 	;push	sysrel1 ; 07/01/2017
 12038 00010B28 8925[60030300]      <1> 	mov	[u.usp], esp
 12039                              <1> 	;
 12040 00010B2E E845060000          <1> 	call	wswap ; Save MainProg (process 1) 'u' structure
 12041                              <1> 		      ; and registers for return (from program)	
 12042 00010B33 89EC                <1> 	mov	esp, ebp ; **
 12043                              <1> 	;;22/01/2017
 12044                              <1> 	;;sti ; 07/01/2017
 12045 00010B35 50                  <1> 	push	eax  ; * 'loc_load_and_run_file_8:' address
 12046                              <1> 	;
 12047                              <1> 	;;; 02/05/2016
 12048                              <1> 	;;; Create a new process (parent: MainProg)	
 12049 00010B36 31F6                <1> 	xor 	esi, esi
 12050                              <1> cnpm_1: ; search p.stat table for unused process number
 12051 00010B38 46                  <1> 	inc	esi
 12052 00010B39 80BE[AF000300]00    <1> 	cmp	byte [esi+p.stat-1], 0 ; SFREE
 12053                              <1> 				; is process active, unused, dead
 12054 00010B40 760B                <1> 	jna	short cnpm_2	; it's unused so branch
 12055 00010B42 6683FE10            <1> 	cmp	si, nproc 	; all processes checked
 12056 00010B46 72F0                <1> 	jb	short cnpm_1    ; no, branch back
 12057 00010B48 E95E6AFFFF          <1> 	jmp	panic 
 12058                              <1> cnpm_2:
 12059 00010B4D A1[B8030300]        <1> 	mov	eax, [u.pgdir] ; page directory of MainProg
 12060 00010B52 A3[BC030300]        <1> 	mov	[u.ppgdir], eax ; parent's page directory
 12061 00010B57 E86D50FFFF          <1> 	call	allocate_page
 12062 00010B5C 0F82496AFFFF        <1> 	jc	panic
 12063                              <1> 	; EAX = UPAGE (user structure page) address
 12064 00010B62 A3[B4030300]        <1> 	mov	[u.upage], eax ; memory page for 'user' struct (child)
 12065 00010B67 89F7                <1> 	mov	edi, esi
 12066 00010B69 66C1E702            <1> 	shl	di, 2
 12067 00010B6D 8987[BC000300]      <1> 	mov	[edi+p.upage-4], eax ; memory page for 'user' struct
 12068 00010B73 E8CB50FFFF          <1> 	call	clear_page ; 03/05/2016
 12069                              <1> 	;movzx	eax, byte [p.ttyc] ; console tty (for MainProg)
 12070 00010B78 6629C0              <1> 	sub	ax, ax ; 0
 12071 00010B7B 668986[7F000300]    <1> 	mov     [esi+p.ttyc-1], ax ; al - set child's console tty
 12072                              <1> 				   ; ah - reset child's wait channel	
 12073 00010B82 89F0                <1> 	mov	eax, esi
 12074 00010B84 A2[B3030300]        <1> 	mov	[u.uno], al ; child process number
 12075 00010B89 FE86[AF000300]      <1>         inc     byte [esi+p.stat-1] ; 1, SRUN
 12076 00010B8F 66D1E6              <1> 	shl	si, 1 ; multiply si by 2 to get index into p.pid table
 12077 00010B92 66FF05[4E030300]    <1> 	inc	word [mpid] ; increment m.pid; get a new process name
 12078 00010B99 66A1[4E030300]      <1> 	mov	ax, [mpid]
 12079 00010B9F 668986[1E000300]    <1> 	mov	[esi+p.pid-2], ax ; put new process name 
 12080                              <1> 				  ; in child process' name slot
 12081                              <1> 	;mov	ax, [p.pid]  ; get process name of MainProg
 12082 00010BA6 66B80100            <1> 	mov	ax, 1
 12083 00010BAA 668986[3E000300]    <1> 	mov	[esi+p.ppid-2], ax ; put parent process name 
 12084                              <1> 			           ; in parent process slot for child
 12085 00010BB1 6648                <1> 	dec	ax ; 0
 12086 00010BB3 66A3[94030300]      <1> 	mov 	[u.ttyp], ax ; 0
 12087                              <1> 	;;;
 12088 00010BB9 A1[51040300]        <1> 	mov 	eax,  [ii]
 12089                              <1> 	; Retro UNIX 386 v1, 'sysexec' (u2.s)
 12090 00010BBE E84A170000          <1> 	call	iopen
 12091                              <1> 	; 06/06/2016
 12092 00010BC3 C605[A9030300]01    <1> 	mov	byte [u.pri], 1 ; normal priority
 12093                              <1> 	;
 12094 00010BCA EB16                <1> 	jmp	short sysexec_7 ; 02/05/2016
 12095                              <1> 
 12096                              <1> sysexec_6:
 12097                              <1> 	; 19/11/2017
 12098                              <1> 	; 18/11/2017
 12099                              <1> 	; 14/11/2017
 12100                              <1> 	; 13/11/2017
 12101 00010BCC 8925[4C040300]      <1> 	mov	[argv], esp ; *!* ; start address of argument list 
 12102                              <1> 
 12103                              <1> 	; 04/01/2017
 12104                              <1> 	; 24/10/2016
 12105                              <1> 	;;02/05/2016
 12106                              <1> 	; 23/04/2016 (TRDOS 386)
 12107                              <1> 	; 18/10/2015 ('sysexec_6')
 12108                              <1> 	; 23/06/2015
 12109 00010BD2 A1[B8030300]        <1> 	mov	eax, [u.pgdir] ; physical address of page directory
 12110                              <1> 	;cmp 	eax, [k_page_dir] ; TRDOS MainProg ? 
 12111                              <1> 	;je	short sysexec_7
 12112                              <1> 	; 19/11/2017
 12113 00010BD7 8B1D[BC030300]      <1> 	mov	ebx, [u.ppgdir] ; phy addr of the parent's page dir
 12114 00010BDD E82051FFFF          <1> 	call	deallocate_page_dir
 12115                              <1> sysexec_7:
 12116 00010BE2 E85050FFFF          <1> 	call	make_page_dir
 12117 00010BE7 0F82BE69FFFF        <1> 	jc	panic  ; allocation error 
 12118                              <1> 		       ; after a deallocation would be nonsence !?
 12119                              <1> 	; 24/07/2015
 12120                              <1> 	; map kernel pages (1st 4MB) to PDE 0
 12121                              <1> 	;     of the user's page directory
 12122                              <1> 	;     (It is needed for interrupts!)
 12123                              <1> 	; 18/10/2015
 12124 00010BED 8B15[90810100]      <1> 	mov	edx, [k_page_dir] ; Kernel's page directory
 12125 00010BF3 8B02                <1> 	mov	eax, [edx] ; physical address of
 12126                              <1> 			   ; kernel's first page table (1st 4 MB)
 12127                              <1> 			   ; (PDE 0 of kernel's page directory)
 12128 00010BF5 8B15[B8030300]      <1> 	mov 	edx, [u.pgdir]
 12129 00010BFB 8902                <1> 	mov	[edx], eax ; PDE 0 (1st 4MB)
 12130                              <1> 	;
 12131                              <1> 	; 20/07/2015
 12132 00010BFD BB00004000          <1> 	mov	ebx, CORE ; start address = 0 (virtual) + CORE
 12133                              <1> 	; 18/10/2015
 12134 00010C02 BE[3C040300]        <1> 	mov	esi, pcore ; physical start address
 12135                              <1> sysexec_8:	
 12136 00010C07 B907000000          <1> 	mov	ecx, PDE_A_USER + PDE_A_WRITE + PDE_A_PRESENT
 12137 00010C0C E84450FFFF          <1> 	call	make_page_table
 12138 00010C11 0F829469FFFF        <1> 	jc	panic
 12139                              <1> 	;mov	ecx, PTE_A_USER + PTE_A_WRITE + PTE_A_PRESENT
 12140 00010C17 E84750FFFF          <1> 	call	make_page ; make new page, clear and set the pte 
 12141 00010C1C 0F828969FFFF        <1> 	jc	panic
 12142                              <1> 	;
 12143 00010C22 8906                <1> 	mov	[esi], eax ; 24/06/2015
 12144                              <1> 	; ebx = virtual address (24/07/2015)
 12145 00010C24 E8DF55FFFF          <1> 	call 	add_to_swap_queue
 12146                              <1> 	; 18/10/2015
 12147 00010C29 81FE[40040300]      <1> 	cmp	esi, ecore ; user's stack (last) page ?
 12148 00010C2F 740C                <1> 	je	short sysexec_9 ; yes
 12149 00010C31 BE[40040300]        <1> 	mov	esi, ecore  ; physical address of the last page 
 12150                              <1> 	; 20/07/2015
 12151 00010C36 BB00F0FFFF          <1> 	mov	ebx, (ECORE - PAGE_SIZE) + CORE
 12152                              <1> 	; ebx = virtual end address + segment base address - 4K
 12153 00010C3B EBCA                <1>         jmp     short sysexec_8
 12154                              <1> sysexec_9:
 12155                              <1> 	; 19/11/2017 
 12156                              <1> 	; 24/04/2016 (TRDOS 386 = TRDOS v2.0)
 12157                              <1> 	; 25/06/2015, 26/08/2015, 18/10/2015
 12158                              <1> 	; move arguments from kernel stack to [ecore]
 12159                              <1> 	; (argument list/line will be copied from kernel stack
 12160                              <1> 	; frame to the last (stack) page of user's core memory)
 12161                              <1> 	; 18/10/2015
 12162 00010C3D 8B3D[40040300]      <1> 	mov	edi, [ecore]
 12163 00010C43 81C700100000        <1> 	add	edi, PAGE_SIZE
 12164                              <1> 	; 19/11/2017
 12165 00010C49 83EF04              <1> 	sub	edi, 4
 12166 00010C4C C70700000000        <1> 	mov	dword [edi], 0 
 12167 00010C52 89FB                <1> 	mov	ebx, edi
 12168                              <1> 	;
 12169 00010C54 0FB705[4A040300]    <1> 	movzx	eax, word [argc]
 12170 00010C5B 09C0                <1> 	or	eax, eax
 12171 00010C5D 7445                <1> 	jz	short sysexec_13 ; 19/11/2017
 12172                              <1> 	;jnz	short sysexec_10
 12173                              <1> 	;mov 	ebx, edi
 12174                              <1> 	;sub	ebx, 4 
 12175                              <1> 	;mov	[ebx], eax ; 0
 12176                              <1> 	;jmp 	short sysexec_13
 12177                              <1> sysexec_10:
 12178 00010C5F 8B0D[8C030300]      <1> 	mov	ecx, [u.nread]
 12179                              <1> 	; 13/11/2017
 12180                              <1> 	;mov	esi, TextBuffer ; 'load_and_execute_file'
 12181                              <1> 	;mov	esi, esp  	; 'sysexec'
 12182 00010C65 8B35[4C040300]      <1> 	mov	esi, [argv] ; 24/04/2016 (TRDOS 386  = TRDOS v2.0)
 12183                              <1> 	;sub	edi, ecx ; page end address - argument list length
 12184 00010C6B 29CB                <1> 	sub	ebx, ecx ; 19/11/2017
 12185 00010C6D 89C2                <1> 	mov	edx, eax
 12186 00010C6F FEC2                <1> 	inc	dl ; argument count + 1 for argc value  
 12187 00010C71 C0E202              <1> 	shl 	dl, 2  ; 4 * (argument count + 1)
 12188                              <1> 	;mov	ebx, edi
 12189 00010C74 89DF                <1> 	mov	edi, ebx ; 19//11/2017
 12190 00010C76 80E3FC              <1> 	and	bl, 0FCh ; 32 bit (dword) alignment
 12191 00010C79 29D3                <1> 	sub 	ebx, edx
 12192 00010C7B 89FA                <1> 	mov	edx, edi
 12193 00010C7D F3A4                <1> 	rep	movsb
 12194 00010C7F 89D6                <1> 	mov 	esi, edx
 12195 00010C81 89DF                <1> 	mov 	edi, ebx
 12196 00010C83 BA00F0BFFF          <1> 	mov	edx, ECORE - PAGE_SIZE ; virtual addr. of the last page
 12197 00010C88 2B15[40040300]      <1> 	sub 	edx, [ecore] ; difference (virtual - physical) 
 12198 00010C8E AB                  <1> 	stosd	; eax = argument count	
 12199                              <1> sysexec_11:
 12200 00010C8F 89F0                <1> 	mov	eax, esi
 12201 00010C91 01D0                <1> 	add	eax, edx
 12202 00010C93 AB                  <1> 	stosd  ; eax = virtual address
 12203                              <1> 	;dec	byte [argc]
 12204 00010C94 66FF0D[4A040300]    <1> 	dec	word [argc] ; 14/11/2017
 12205 00010C9B 7407                <1> 	jz	short sysexec_13
 12206                              <1> sysexec_12:
 12207 00010C9D AC                  <1> 	lodsb
 12208 00010C9E 20C0                <1> 	and	al, al
 12209 00010CA0 75FB                <1> 	jnz	short sysexec_12
 12210 00010CA2 EBEB                <1> 	jmp	short sysexec_11
 12211                              <1> sysexec_13:
 12212                              <1> 	; 24/10/2016
 12213                              <1> 	; 24/04/2016 - TRDOS 386 (TRDOS v2.0)
 12214                              <1> 	; 23/06/2015 - 19/10/2015 (Retro UNIX 386 v1, 'sysexec_13')
 12215                              <1> 	;
 12216                              <1> 	; moving arguments to [ecore] is OK here..
 12217                              <1> 	;
 12218                              <1> 	; ebx = beginning addres of argument list pointers
 12219                              <1> 		;	in user's stack
 12220 00010CA4 2B1D[40040300]      <1> 	sub 	ebx, [ecore]
 12221 00010CAA 81C300F0BFFF        <1> 	add     ebx, (ECORE - PAGE_SIZE)
 12222                              <1> 			; end of core - 4096 (last page)
 12223                              <1> 			; (virtual address)
 12224 00010CB0 891D[4C040300]      <1> 	mov	[argv], ebx
 12225 00010CB6 891D[90030300]      <1> 	mov	[u.break], ebx ; available user memory
 12226                              <1> 	;
 12227 00010CBC 29C0                <1> 	sub	eax, eax
 12228 00010CBE C705[88030300]2000- <1> 	mov	dword [u.count], 32 ; Executable file header size
 12228 00010CC6 0000                <1>
 12229 00010CC8 C705[74030300]-     <1> 	mov	dword [u.fofp], u.off
 12229 00010CCE [80030300]          <1>
 12230 00010CD2 A3[80030300]        <1> 	mov	[u.off], eax ; 0
 12231 00010CD7 A3[84030300]        <1> 	mov	[u.base], eax ; 0, start of user's core (virtual)
 12232                              <1> 	; 24/10/2016
 12233 00010CDC A0[56820100]        <1> 	mov	al, [Current_Drv]
 12234 00010CE1 A2[46030300]        <1> 	mov	[cdev], al
 12235                              <1> 	;
 12236 00010CE6 A1[51040300]        <1> 	mov	eax, [ii] ; Fist Cluster of the Program (PRG) file
 12237                              <1> 	; EAX = First cluster of the executable file
 12238 00010CEB E80A010000          <1> 	call	readi
 12239                              <1> 
 12240 00010CF0 8B0D[90030300]      <1> 	mov	ecx, [u.break] ; top of user's stack (physical addr.)
 12241 00010CF6 890D[88030300]      <1> 	mov	[u.count], ecx ; save for overrun check
 12242                              <1> 	;
 12243 00010CFC 8B0D[8C030300]      <1> 	mov	ecx, [u.nread]
 12244 00010D02 890D[90030300]      <1> 	mov	[u.break], ecx ; virtual address (offset from start)
 12245 00010D08 80F920              <1> 	cmp	cl, 32
 12246 00010D0B 7540                <1>         jne     short sysexec_15
 12247                              <1> 	;:
 12248                              <1> 	; Retro UNIX 386 v1 (32 bit) executable file header format
 12249 00010D0D 8B35[3C040300]      <1> 	mov	esi, [pcore] ; start address of user's core memory 
 12250                              <1> 		             ; (phys. start addr. of the exec. file)
 12251 00010D13 AD                  <1> 	lodsd
 12252 00010D14 663DEB1E            <1> 	cmp	ax, 1EEBh ; EBH, 1Eh -> jump to +32
 12253 00010D18 7533                <1> 	jne	short sysexec_15
 12254 00010D1A AD                  <1> 	lodsd
 12255 00010D1B 89C1                <1> 	mov	ecx, eax ; text (code) section size
 12256 00010D1D AD                  <1> 	lodsd
 12257 00010D1E 01C1                <1> 	add	ecx, eax ; + data section size (initialized data)
 12258 00010D20 89CB                <1> 	mov	ebx, ecx
 12259 00010D22 AD                  <1> 	lodsd	
 12260 00010D23 01C3                <1> 	add	ebx, eax ; + bss section size (for overrun checking)
 12261 00010D25 3B1D[88030300]      <1> 	cmp	ebx, [u.count]
 12262 00010D2B 7711                <1> 	ja	short sysexec_14  ; program overruns stack !
 12263                              <1> 	;
 12264                              <1> 	; add bss section size to [u.break]
 12265 00010D2D 0105[90030300]      <1> 	add 	[u.break], eax
 12266                              <1> 	;
 12267 00010D33 83E920              <1> 	sub	ecx, 32  ; header size (already loaded)
 12268                              <1> 	;cmp	ecx, [u.count]
 12269                              <1> 	;jnb	short sysexec_16
 12270 00010D36 890D[88030300]      <1> 	mov	[u.count], ecx ; required read count
 12271 00010D3C EB29                <1> 	jmp	short sysexec_16
 12272                              <1> sysexec_14:
 12273                              <1> 	; insufficient (out of) memory
 12274 00010D3E C705[C8030300]0400- <1> 	mov	dword [u.error], ERR_MINOR_IM ; 1
 12274 00010D46 0000                <1>
 12275 00010D48 E97FCBFFFF          <1> 	jmp	error
 12276                              <1> sysexec_15:
 12277 00010D4D 8B15[55040300]      <1>         mov	edx, [i.size] ; file size
 12278 00010D53 29CA                <1> 	sub	edx, ecx ; file size - loaded bytes
 12279 00010D55 7626                <1> 	jna	short sysexec_17 ; no need to next read
 12280 00010D57 01D1                <1> 	add	ecx, edx ; [i.size]
 12281 00010D59 3B0D[88030300]      <1> 	cmp	ecx, [u.count] ; overrun check (!)
 12282 00010D5F 77DD                <1> 	ja	short sysexec_14
 12283 00010D61 8915[88030300]      <1> 	mov	[u.count], edx
 12284                              <1> sysexec_16:
 12285 00010D67 A1[51040300]        <1> 	mov	eax, [ii] ; first cluster
 12286 00010D6C E889000000          <1> 	call	readi
 12287 00010D71 8B0D[8C030300]      <1> 	mov	ecx, [u.nread]
 12288 00010D77 010D[90030300]      <1> 	add	[u.break], ecx
 12289                              <1> sysexec_17:
 12290 00010D7D A1[51040300]        <1> 	mov	eax, [ii] ; first cluster
 12291 00010D82 E886150000          <1> 	call	iclose
 12292 00010D87 31C0                <1> 	xor     eax, eax
 12293 00010D89 FEC0                <1> 	inc	al
 12294 00010D8B 66A3[AA030300]      <1> 	mov	[u.intr], ax ; 1 (interrupt/time-out is enabled)
 12295 00010D91 66A3[AC030300]      <1> 	mov	[u.quit], ax ; 1 ('crtl+brk' signal is enabled) 
 12296 00010D97 833D[BC030300]00    <1>         cmp	dword [u.ppgdir], 0  ; is the caller MainProg (kernel) ?
 12297 00010D9E 770C                <1> 	ja	short sysexec_18 ; no, the caller is user process
 12298                              <1> 	; If the caller is kernel (MainProg), 'sysexec' will come here
 12299 00010DA0 8B15[90810100]      <1> 	mov	edx, [k_page_dir] ; kernel's page directory
 12300 00010DA6 8915[BC030300]      <1> 	mov	[u.ppgdir], edx ; next time 'sysexec' must not come here 
 12301                              <1> sysexec_18:
 12302                              <1> 	; 02/05/2016
 12303                              <1> 	; 24/04/2016 (TRDOS 386 = TRDOS v2.0)
 12304                              <1> 	; 18/10/2015 (Retro UNIX 386 v1)
 12305                              <1> 	; 05/08/2015
 12306                              <1> 	; 29/07/2015
 12307                              <1> 
 12308                              <1> ;	; **** arguments list test start - 19/11/2017
 12309                              <1> ;	mov	ebp, [argv]
 12310                              <1> ;	sub	ebp, ECORE - 4096
 12311                              <1> ;	add	ebp, [ecore]
 12312                              <1> ;
 12313                              <1> ;	mov	ebx, [ebp]
 12314                              <1> ;	mov	[argc], bx
 12315                              <1> ;	add	ebp, 4
 12316                              <1> ;	mov	byte [ccolor], 1Fh
 12317                              <1> ;_zx0:
 12318                              <1> ;	cmp	word [argc], 0
 12319                              <1> ;	jna	short _zx2	
 12320                              <1> ;_zx1:
 12321                              <1> ;	push	ebp
 12322                              <1> ;	mov	esi, [ebp]
 12323                              <1> ;
 12324                              <1> ;	sub	esi, ECORE - 4096
 12325                              <1> ;	add	esi, [ecore]
 12326                              <1> ;
 12327                              <1> ;	call	print_cmsg
 12328                              <1> ;
 12329                              <1> ;	dec	word [argc]
 12330                              <1> ;	jz	short _zx2
 12331                              <1> ;
 12332                              <1> ;	mov	al, '.'
 12333                              <1> ;	mov	bl, 07h
 12334                              <1> ;	mov	bh, [u.ttyn]
 12335                              <1> ;	call 	_write_tty 
 12336                              <1> ;
 12337                              <1> ;	pop	ebp
 12338                              <1> ;	add	ebp, 4
 12339                              <1> ;	jmp	short _zx1			
 12340                              <1> ;_zx2:
 12341                              <1> ;	pop	ebp
 12342                              <1> ;	mov	byte [ccolor], 07h
 12343                              <1> ;	mov	eax, 1
 12344                              <1> ;	; **** arguments list test stop
 12345                              <1> ;	Test result is OK! (there is not a wrong thing) - 19/11/2017
 12346                              <1> 
 12347 00010DAC 8B2D[4C040300]      <1> 	mov	ebp, [argv] ; user's stack pointer must point to argument
 12348                              <1> 			    ; list pointers (argument count)
 12349 00010DB2 FA                  <1> 	cli
 12350 00010DB3 8B25[2C810100]      <1>         mov     esp, [tss.esp0] ; ring 0 (kernel) stack pointer
 12351                              <1> 	;mov   	esp, [u.sp] ; Restore Kernel stack
 12352                              <1> 			    ; for this process	 
 12353                              <1> 	;add	esp, 20 ; --> EIP, CS, EFLAGS, ESP, SS
 12354                              <1> 	;xor	eax, eax ; 0
 12355 00010DB9 FEC8                <1> 	dec	al ; eax = 0
 12356                              <1> 	;mov	edx, UDATA
 12357                              <1> 	; 18/11/2017
 12358 00010DBB 6A23                <1> 	push	UDATA ; user's stack segment
 12359                              <1> 	;push	edx
 12360 00010DBD 55                  <1> 	push	ebp ; user's stack pointer
 12361                              <1> 		    ; (points to number of arguments)
 12362                              <1> 	
 12363                              <1> 	; 04/01/2017
 12364                              <1> 	; MainProg comes here while [sysflg]= 0FFh
 12365                              <1> 	; (but sysexec comes here while [sysflg]= 0)
 12366 00010DBE C605[5B030300]00    <1> 	mov	byte [sysflg], 0 ; 04/01/2017
 12367                              <1> 				 ; (timer_int sysflg control)
 12368 00010DC5 FB                  <1> 	sti
 12369 00010DC6 9C                  <1> 	pushfd	; EFLAGS
 12370                              <1> 		; Set IF for enabling interrupts in user mode	
 12371                              <1> 	;or	dword [esp], 200h 
 12372                              <1> 	;
 12373                              <1> 	;mov	bx, UCODE
 12374                              <1> 	;push	bx ; user's code segment
 12375 00010DC7 6A1B                <1> 	push	UCODE
 12376                              <1> 	;push	0
 12377 00010DC9 50                  <1> 	push	eax ; EIP (=0) - start address -	
 12378 00010DCA 8925[5C030300]      <1> 	mov	[u.sp], esp ; 29/07/2015
 12379                              <1> 	; 05/08/2015
 12380                              <1> 	; Remedy of a General Protection Fault during 'iretd' is here !
 12381                              <1> 	; ('push dx' would cause to general protection fault, 
 12382                              <1> 	; after 'pop ds' etc.)
 12383                              <1> 	;
 12384                              <1> 	;; push dx ; ds (UDATA)
 12385                              <1> 	;; push dx ; es (UDATA)
 12386                              <1> 	;; push dx ; fs (UDATA)
 12387                              <1> 	;; push dx ; gs (UDATA)
 12388                              <1> 	;
 12389                              <1> 	; This is a trick to prevent general protection fault
 12390                              <1> 	; during 'iretd' intruction at the end of 'sysrele' (in u1.s):
 12391 00010DD0 66BA2300            <1> 	mov	dx, UDATA ; 19/11/2017
 12392 00010DD4 8EC2                <1> 	mov 	es, dx ; UDATA
 12393 00010DD6 06                  <1> 	push 	es ; ds (UDATA)
 12394 00010DD7 06                  <1> 	push 	es ; es (UDATA)
 12395 00010DD8 06                  <1> 	push 	es ; fs (UDATA)
 12396 00010DD9 06                  <1> 	push	es ; gs (UDATA)
 12397 00010DDA 66BA1000            <1> 	mov	dx, KDATA
 12398 00010DDE 8EC2                <1> 	mov	es, dx
 12399                              <1> 	;
 12400                              <1> 	;; pushad simulation
 12401 00010DE0 89E5                <1> 	mov	ebp, esp ; esp before pushad
 12402 00010DE2 50                  <1> 	push	eax ; eax (0)
 12403 00010DE3 50                  <1> 	push	eax ; ecx (0)
 12404 00010DE4 50                  <1> 	push	eax ; edx (0)
 12405 00010DE5 50                  <1> 	push	eax ; ebx (0)
 12406 00010DE6 55                  <1> 	push	ebp ; esp before pushad
 12407 00010DE7 50                  <1> 	push	eax ; ebp (0)
 12408 00010DE8 50                  <1> 	push	eax ; esi (0)		
 12409 00010DE9 50                  <1> 	push	eax ; edi (0)	
 12410                              <1> 	;
 12411 00010DEA A3[64030300]        <1> 	mov	[u.r0], eax ; eax = 0
 12412 00010DEF 8925[60030300]      <1> 	mov	[u.usp], esp
 12413                              <1> 
 12414                              <1> 	; 14/11/2017
 12415 00010DF5 E9F4CAFFFF          <1> 	jmp	sysret0
 12416                              <1> 
 12417                              <1> ;	; 02/05/2016
 12418                              <1> ;	;inc	byte [sysflg] ; 0FFh -> 0
 12419                              <1> ;	;mov	byte [sysflg], 0 ; 04/01/2017
 12420                              <1> ;	movzx	ebx, byte [u.uno]
 12421                              <1> ;	shl	bl, 1 ; 13/11/2017 	
 12422                              <1> ;	cmp	word [ebx+p.ppid-2], 1 ; MainProg
 12423                              <1> ;	ja	sysret0 ; 03/05/2016
 12424                              <1> ;	push	sysret ; * 
 12425                              <1> ;	mov	[u.usp], esp
 12426                              <1> ;	call	wswap ; save child process 'u' structure and
 12427                              <1> ;		      ; registers
 12428                              <1> ;	add	dword [u.usp], 4 ; 03/05/2016 
 12429                              <1> ;sysexec_19: ; 02/05/2016
 12430                              <1> ;	retn ; * 'sysret' ; byte [sysflg] -> 0FFh
 12431                              <1> 
 12432                              <1> readi:
 12433                              <1> 	; 01/05/2016
 12434                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
 12435                              <1> 	; 20/05/2015 - Retro UNIX 386 v1
 12436                              <1> 	; 11/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
 12437                              <1> 	;
 12438                              <1> 	; Reads from a file whose the first cluster number in EAX
 12439                              <1> 	; 
 12440                              <1> 	; INPUTS ->
 12441                              <1> 	;    EAX - First cluster number of the file
 12442                              <1> 	;    u.count - byte count user desires
 12443                              <1> 	;    u.base - points to user buffer
 12444                              <1> 	;    u.fofp - points to dword with current file offset
 12445                              <1> 	;    i.size - file size
 12446                              <1> 	;    cdev - logical dos drive number of the file
 12447                              <1> 	; OUTPUTS ->
 12448                              <1> 	;    u.count - cleared
 12449                              <1> 	;    u.nread - accumulates total bytes passed back
 12450                              <1> 	;
 12451                              <1> 	; ((EAX)) input/output
 12452                              <1> 	; (Retro UNIX Prototype : 14/12/2012 - 01/03/2013, UNIXCOPY.ASM)
 12453                              <1>         ; ((Modified registers: edx, ebx, ecx, esi, edi))  
 12454                              <1> 
 12455 00010DFA 31D2                <1> 	xor	edx, edx ; 0
 12456 00010DFC 8915[8C030300]      <1> 	mov 	[u.nread], edx ; 0
 12457 00010E02 668915[C4030300]    <1> 	mov	[u.pcount], dx ; 19/05/2015
 12458 00010E09 3915[88030300]      <1> 	cmp 	[u.count], edx ; 0
 12459 00010E0F 7701                <1> 	ja 	short readi_1
 12460 00010E11 C3                  <1> 	retn
 12461                              <1> readi_1:
 12462                              <1> dskr:
 12463                              <1> 	; 01/05/2016
 12464                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
 12465                              <1> 	; 24/05/2015 - 12/10/2015 (Retro UNIX 386 v1)
 12466                              <1> 	; 26/04/2013 - 03/08/2013 (Retro UNIX 8086 v1)
 12467                              <1> dskr_0:
 12468 00010E12 8B15[55040300]      <1>         mov	edx, [i.size]
 12469 00010E18 8B1D[74030300]      <1> 	mov	ebx, [u.fofp]
 12470 00010E1E 2B13                <1> 	sub	edx, [ebx]
 12471 00010E20 7647                <1> 	jna	short dskr_4
 12472                              <1> 	;
 12473 00010E22 50                  <1> 	push	eax ; 01/05/2016
 12474 00010E23 3B15[88030300]      <1> 	cmp     edx, [u.count] 
 12475 00010E29 7306                <1> 	jnb	short dskr_1
 12476 00010E2B 8915[88030300]      <1> 	mov	[u.count], edx
 12477                              <1> dskr_1:
 12478                              <1> 	; EAX = First Cluster
 12479                              <1> 	; [Current_Drv] = Physical drive number 
 12480 00010E31 E83B000000          <1> 	call	mget_r
 12481                              <1> 	; NOTE: in 'mget_r', relevant sector will be read in buffer
 12482                              <1> 	; if it is not already in buffer !
 12483 00010E36 BB[8C050300]        <1> 	mov	ebx, readi_buffer
 12484 00010E3B 803D[C6030300]00    <1> 	cmp	byte [u.kcall], 0 ; the caller is 'namei' sign (=1)
 12485 00010E42 770F                <1> 	ja	short dskr_3	  ; zf=0 -> the caller is 'namei'
 12486 00010E44 66833D[C4030300]00  <1> 	cmp	word [u.pcount], 0
 12487 00010E4C 7705                <1> 	ja	short dskr_3
 12488                              <1> dskr_2:
 12489                              <1> 	; [u.base] = virtual address to transfer (as destination address)
 12490 00010E4E E894010000          <1> 	call	trans_addr_w ; translate virtual address to physical (w)
 12491                              <1> dskr_3:
 12492                              <1> 	; EBX (r5) = system (I/O) buffer address -physical-
 12493 00010E53 E8F7010000          <1> 	call	sioreg
 12494 00010E58 87F7                <1> 	xchg	esi, edi
 12495                              <1> 	; EDI = file (user data) offset
 12496                              <1> 	; ESI = sector (I/O) buffer offset
 12497                              <1> 	; ECX = byte count
 12498 00010E5A F3A4                <1> 	rep	movsb
 12499                              <1> 	; eax = remain bytes in buffer
 12500                              <1>         ;       (check if remain bytes in the buffer > [u.pcount])
 12501 00010E5C 09C0                <1> 	or	eax, eax
 12502 00010E5E 75EE                <1> 	jnz	short dskr_2 ; (page end before system buffer end!)		
 12503 00010E60 58                  <1> 	pop	eax  ; (first cluster number)
 12504 00010E61 390D[88030300]      <1> 	cmp	[u.count], ecx ; 0
 12505 00010E67 77A9                <1> 	ja	short dskr_0
 12506                              <1> dskr_4:
 12507 00010E69 C605[C6030300]00    <1> 	mov	byte [u.kcall], 0
 12508 00010E70 C3                  <1> 	retn
 12509                              <1> 
 12510                              <1> mget_r:
 12511                              <1> 	; 24/10/2016
 12512                              <1> 	; 22/10/2016
 12513                              <1> 	; 12/10/2016
 12514                              <1> 	; 29/04/2016
 12515                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
 12516                              <1> 	; 03/06/2015 (Retro UNIX 386 v1, 'mget', u.5s)
 12517                              <1> 	; 22/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
 12518                              <1> 	;
 12519                              <1> 	; Get existing or (allocate) a new disk block for file
 12520                              <1> 	; 
 12521                              <1> 	; INPUTS ->
 12522                              <1> 	;    [u.fofp] = file offset pointer
 12523                              <1> 	;    EAX = First Cluster
 12524                              <1> 	;    [cdev] = Logical dos drive number 	  
 12525                              <1> 	;    ([u.off] = file offset)
 12526                              <1> 	; OUTPUTS ->
 12527                              <1> 	;    EAX = logical sector number
 12528                              <1> 	;    ESI = Logical Dos Drive Description Table address	
 12529                              <1> 	;
 12530                              <1> 	; Modified registers: EDX, EBX, ECX, ESI, EDI
 12531                              <1> 
 12532 00010E71 8B35[74030300]      <1> 	mov     esi, [u.fofp]
 12533 00010E77 8B1E                <1> 	mov	ebx, [esi] ; (u.off)
 12534                              <1> 
 12535 00010E79 29C9                <1> 	sub	ecx, ecx
 12536 00010E7B 8A2D[46030300]      <1> 	mov	ch, [cdev]
 12537                              <1> 
 12538 00010E81 BE00010900          <1> 	mov	esi, Logical_DOSDisks
 12539 00010E86 01CE                <1> 	add	esi, ecx
 12540                              <1> 
 12541 00010E88 380D[C48D0100]      <1> 	cmp	[readi.valid], cl ; 0
 12542 00010E8E 7649                <1> 	jna	short mget_r_0
 12543                              <1> 	
 12544 00010E90 3A2D[C58D0100]      <1> 	cmp	ch, [readi.drv]
 12545 00010E96 7541                <1> 	jne	short mget_r_0
 12546                              <1> 
 12547 00010E98 3B05[D88D0100]      <1> 	cmp	eax, [readi.fclust]
 12548 00010E9E 7565                <1> 	jne	short mget_r_3
 12549                              <1> 	
 12550 00010EA0 89D8                <1> 	mov	eax, ebx ; file offset
 12551 00010EA2 668B0D[CC8D0100]    <1> 	mov	cx, [readi.bpc]
 12552 00010EA9 41                  <1> 	inc	ecx ; <= 65536
 12553 00010EAA 29D2                <1> 	sub	edx, edx
 12554 00010EAC F7F1                <1> 	div	ecx
 12555                              <1> 
 12556 00010EAE 8B3D[D48D0100]      <1> 	mov	edi, [readi.c_index] ; cluster index
 12557                              <1> 
 12558 00010EB4 39F8                <1> 	cmp	eax, edi
 12559 00010EB6 757A                <1>         jne     short mget_r_4  ; (*)
 12560                              <1> 
 12561                              <1> 	; edx = byte offset in cluster (<= 65535)
 12562 00010EB8 668915[CE8D0100]    <1> 	mov	[readi.offset], dx
 12563 00010EBF 66C1EA09            <1> 	shr	dx, 9 ; / 512
 12564 00010EC3 8815[C78D0100]      <1> 	mov	[readi.s_index], dl ; sector index in cluster (0 to spc -1)
 12565                              <1> 	
 12566 00010EC9 A1[D08D0100]        <1> 	mov	eax, [readi.cluster]  ; > 0 if [readi.valid] = 1
 12567 00010ECE 8B15[DC8D0100]      <1> 	mov	edx, [readi.fs_index]
 12568 00010ED4 E99A000000          <1>         jmp     mget_r_7
 12569                              <1> 	
 12570                              <1> mget_r_0:
 12571 00010ED9 882D[C58D0100]      <1> 	mov	[readi.drv], ch ; physical drive number
 12572 00010EDF 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
 12573 00010EE3 7707                <1> 	ja	short mget_r_1
 12574 00010EE5 8A4E12              <1> 	mov	cl, [esi+LD_FS_BytesPerSec+1]
 12575 00010EE8 D0E9                <1> 	shr	cl, 1 ;  ; 1 for 512 bytes, 4 for 2048 bytes
 12576 00010EEA EB03                <1> 	jmp	short mget_r_2	
 12577                              <1> mget_r_1:
 12578 00010EEC 8A4E13              <1> 	mov	cl, [esi+LD_BPB+BPB_SecPerClust]
 12579                              <1> mget_r_2:
 12580 00010EEF 880D[C68D0100]      <1> 	mov	[readi.spc], cl  ; sectors per cluster
 12581                              <1> 	; NOTE: readi bytes per sector value is always 512 ! 
 12582 00010EF5 66C1E109            <1> 	shl	cx, 9 ; * 512
 12583 00010EF9 6649                <1> 	dec	cx ; bytes per cluster - 1
 12584 00010EFB 66890D[CC8D0100]    <1> 	mov	[readi.bpc], cx
 12585 00010F02 6629C9              <1> 	sub	cx, cx
 12586                              <1> mget_r_3:
 12587 00010F05 A3[D88D0100]        <1> 	mov	[readi.fclust], eax ; first cluster (or FDT address)
 12588 00010F0A 880D[C48D0100]      <1> 	mov	[readi.valid], cl ; 0 
 12589                              <1> 	;mov	[readi.s_index], cl ; 0
 12590                              <1> 	;mov	[readi.offset], cx ; 0
 12591 00010F10 890D[D48D0100]      <1> 	mov	[readi.c_index], ecx ; 0
 12592 00010F16 890D[D08D0100]      <1> 	mov	[readi.cluster], ecx ; 0
 12593 00010F1C 890D[C88D0100]      <1> 	mov	[readi.sector], ecx ; 0
 12594                              <1> 	
 12595 00010F22 89D8                <1> 	mov	eax, ebx ; file offset
 12596 00010F24 668B0D[CC8D0100]    <1> 	mov	cx, [readi.bpc]
 12597 00010F2B 41                  <1> 	inc	ecx ; <= 65536
 12598 00010F2C 29D2                <1> 	sub	edx, edx
 12599 00010F2E F7F1                <1> 	div	ecx
 12600                              <1> 	;mov	edi, [readi.c_index] ; previous cluster index
 12601 00010F30 29FF                <1> 	sub	edi, edi
 12602                              <1> mget_r_4:
 12603 00010F32 A3[D48D0100]        <1> 	mov	[readi.c_index], eax ; cluster index
 12604                              <1> 	; edx = byte offset in cluster (<= 65535)
 12605 00010F37 668915[CE8D0100]    <1> 	mov	[readi.offset], dx
 12606 00010F3E 66C1EA09            <1> 	shr	dx, 9 ; / 512
 12607 00010F42 8815[C78D0100]      <1> 	mov	[readi.s_index], dl ; sector index in cluster (0 to spc -1)
 12608                              <1> 
 12609 00010F48 89C1                <1> 	mov	ecx, eax ; current cluster index
 12610 00010F4A A1[D88D0100]        <1> 	mov	eax, [readi.fclust]
 12611 00010F4F 09C9                <1> 	or	ecx, ecx ; cluster index
 12612 00010F51 741B                <1> 	jz	short mget_r_6
 12613                              <1> 
 12614 00010F53 39CF                <1> 	cmp	edi, ecx
 12615 00010F55 7710                <1> 	ja	short mget_r_5 ; old cluster index is higher
 12616 00010F57 8B15[D08D0100]      <1> 	mov	edx, [readi.cluster]
 12617 00010F5D 21D2                <1> 	and	edx, edx
 12618 00010F5F 7406                <1> 	jz	short mget_r_5
 12619                              <1> 	; valid 'readi' parameters (*)
 12620 00010F61 89D0                <1> 	mov	eax, edx
 12621 00010F63 29F9                <1> 	sub	ecx, edi
 12622 00010F65 740C                <1> 	jz	short mget_r_7
 12623                              <1> mget_r_5:
 12624                              <1> 	; EAX = Beginning cluster
 12625                              <1> 	; EDX = Sector index in disk/file section
 12626                              <1> 	;	(Only for SINGLIX file system!)
 12627                              <1> 	; ECX = Cluster sequence number after the beginning cluster
 12628                              <1> 	; ESI = Logical DOS Drive Description Table address
 12629 00010F67 E8F9C7FFFF          <1> 	call	get_cluster_by_index
 12630 00010F6C 724E                <1> 	jc	short mget_r_err
 12631                              <1> 	; EAX = Cluster number		
 12632                              <1> mget_r_6:
 12633 00010F6E A3[D08D0100]        <1> 	mov	[readi.cluster], eax ; FDT number for Singlix File System
 12634                              <1> mget_r_7:
 12635 00010F73 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
 12636 00010F77 765F                <1> 	jna	short mget_r_12
 12637                              <1> 
 12638 00010F79 83E802              <1> 	sub	eax, 2
 12639 00010F7C 0FB615[C68D0100]    <1> 	movzx	edx, byte [readi.spc]
 12640 00010F83 F7E2                <1> 	mul	edx
 12641                              <1> 
 12642 00010F85 034668              <1> 	add	eax, [esi+LD_DATABegin]
 12643 00010F88 8A15[C78D0100]      <1> 	mov	dl, [readi.s_index]
 12644 00010F8E 01D0                <1> 	add	eax, edx
 12645                              <1> mget_r_8:
 12646                              <1> 	; eax = logical sector number
 12647 00010F90 803D[C48D0100]00    <1> 	cmp	byte [readi.valid], 0
 12648 00010F97 7608                <1> 	jna	short mget_r_9
 12649 00010F99 3B05[C88D0100]      <1> 	cmp	eax, [readi.sector]
 12650 00010F9F 7436                <1> 	je	short mget_r_11 ; sector is already in 'readi' buffer
 12651                              <1> mget_r_9:
 12652 00010FA1 A3[C88D0100]        <1> 	mov	[readi.sector], eax
 12653 00010FA6 BB[8C050300]        <1> 	mov	ebx, readi_buffer ; buffer address
 12654 00010FAB B901000000          <1> 	mov	ecx, 1
 12655                              <1> 	; 29/04/2016
 12656                              <1> 	;xor	dl, dl
 12657                              <1> 
 12658                              <1> 	; EAX = Logical sector number
 12659                              <1> 	; ECX = Sector count
 12660                              <1> 	; EBX = Buffer address
 12661                              <1> 	; (EDX = 0)
 12662                              <1> 	; ESI = Logical DOS drive description table address	
 12663                              <1> 
 12664 00010FB0 E868130000          <1> 	call	disk_read
 12665 00010FB5 7314                <1> 	jnc	short mget_r_10
 12666                              <1> 
 12667                              <1> 	; 22/10/2016 (15h -> 17)
 12668 00010FB7 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
 12669                              <1> mget_r_err:
 12670 00010FBC A3[C8030300]        <1> 	mov	[u.error], eax
 12671                              <1> 	; 12/10/2016
 12672 00010FC1 A3[64030300]        <1> 	mov	[u.r0], eax
 12673 00010FC6 E901C9FFFF          <1> 	jmp	error
 12674                              <1> mget_r_10:
 12675 00010FCB C605[C48D0100]01    <1> 	mov	byte [readi.valid], 1 ; 24/10/2016
 12676 00010FD2 A1[C88D0100]        <1> 	mov	eax, [readi.sector]
 12677                              <1> mget_r_11:
 12678 00010FD7 C3                  <1> 	retn
 12679                              <1> mget_r_12:
 12680                              <1> 	; EAX = FDT number
 12681                              <1> 	; EDX = Sector index from FDT sector (0,1,2,3,4...)
 12682 00010FD8 40                  <1> 	inc	eax ; the first data sector in FS disk section	
 12683 00010FD9 8915[DC8D0100]      <1> 	mov	[readi.fs_index], edx
 12684 00010FDF 01D0                <1> 	add	eax, edx
 12685 00010FE1 EBAD                <1> 	jmp	short mget_r_8
 12686                              <1> 
 12687                              <1> trans_addr_r:
 12688                              <1> 	; 12/10/2016
 12689                              <1> 	; 02/05/2016 - TRDOS 386 (TRDOS v2.0)
 12690                              <1> 	; Translate virtual address to physical address 
 12691                              <1> 	; for reading from user's memory space
 12692                              <1> 	; 04/06/2015 - 18/10/2015 (Retro UNIX 386 v1)
 12693                              <1> 
 12694 00010FE3 31D2                <1> 	xor	edx, edx ; 0 (read access sign)
 12695 00010FE5 EB04                <1> 	jmp 	short trans_addr_rw
 12696                              <1> 
 12697                              <1> trans_addr_w:
 12698                              <1> 	; 12/10/2016
 12699                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
 12700                              <1> 	; Translate virtual address to physical address 
 12701                              <1> 	; for writing to user's memory space
 12702                              <1> 	; 04/06/2015 - 18/10/2015 (Retro UNIX 386 v1)
 12703                              <1> 	
 12704 00010FE7 29D2                <1> 	sub	edx, edx
 12705 00010FE9 FEC2                <1> 	inc	dl ; 1 (write access sign)
 12706                              <1> trans_addr_rw:
 12707 00010FEB 50                  <1> 	push	eax
 12708 00010FEC 53                  <1> 	push	ebx
 12709 00010FED 52                  <1> 	push 	edx ; r/w sign (in DL)
 12710                              <1> 	;
 12711 00010FEE 8B1D[84030300]      <1> 	mov	ebx, [u.base]
 12712 00010FF4 E8E552FFFF          <1> 	call	get_physical_addr ; get physical address
 12713 00010FF9 730F                <1> 	jnc	short passc_0
 12714 00010FFB A3[C8030300]        <1> 	mov	[u.error], eax
 12715 00011000 A3[64030300]        <1> 	mov	[u.r0], eax ; 12/10/2016
 12716                              <1> 	;pop	edx
 12717                              <1> 	;pop 	ebx
 12718                              <1> 	;pop	eax
 12719 00011005 E9C2C8FFFF          <1> 	jmp	error
 12720                              <1> passc_0:
 12721 0001100A F6C202              <1> 	test	dl, PTE_A_WRITE ; writable page
 12722 0001100D 5A                  <1> 	pop	edx
 12723 0001100E 751C                <1> 	jnz	short passc_1
 12724                              <1> 	
 12725 00011010 20D2                <1> 	and 	dl, dl
 12726 00011012 7418                <1> 	jz	short passc_1
 12727                              <1> 	; read only (duplicated) page -must be copied to a new page-
 12728                              <1> 	; EBX = linear address
 12729 00011014 51                  <1> 	push 	ecx
 12730 00011015 E85D4FFFFF          <1> 	call 	copy_page
 12731 0001101A 59                  <1> 	pop	ecx
 12732 0001101B 721E                <1> 	jc	short passc_2
 12733 0001101D 50                  <1> 	push	eax ; physical address of the new/allocated page
 12734 0001101E E8E551FFFF          <1> 	call	add_to_swap_queue	
 12735 00011023 58                  <1> 	pop	eax
 12736 00011024 81E3FF0F0000        <1> 	and 	ebx, PAGE_OFF ; 0FFFh
 12737                              <1> 	;mov 	ecx, PAGE_SIZE
 12738                              <1> 	;sub	ecx, ebx 
 12739 0001102A 01D8                <1> 	add	eax, ebx  
 12740                              <1> passc_1: 
 12741 0001102C A3[C0030300]        <1> 	mov 	[u.pbase], eax ; physical address	
 12742 00011031 66890D[C4030300]    <1> 	mov	[u.pcount], cx ; remain byte count in page (1-4096)
 12743 00011038 5B                  <1> 	pop	ebx
 12744 00011039 58                  <1> 	pop	eax
 12745 0001103A C3                  <1> 	retn
 12746                              <1> passc_2:
 12747 0001103B B804000000          <1> 	mov	eax, ERR_MINOR_IM ; "Insufficient memory !" error
 12748 00011040 A3[64030300]        <1> 	mov	[u.r0], eax ; 12/10/2016
 12749 00011045 A3[C8030300]        <1> 	mov	dword [u.error], eax
 12750                              <1> 	;pop 	ebx
 12751                              <1> 	;pop	eax
 12752 0001104A E97DC8FFFF          <1> 	jmp	error
 12753                              <1> 
 12754                              <1> sioreg: 
 12755                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
 12756                              <1> 	; 19/05/2015 - 25/07/2015 (Retro UNIX 386 v1)
 12757                              <1> 	; 12/03/2013 - 22/07/2013 (Retro UNIX 8086 v1)
 12758                              <1> 	; INPUTS -> 
 12759                              <1> 	;     EBX = system buffer (data) address (r5)
 12760                              <1> 	;     [u.fofp] = pointer to file offset pointer
 12761                              <1> 	;     [u.base] = virtual address of the user buffer
 12762                              <1> 	;     [u.pbase] = physical address of the user buffer
 12763                              <1> 	;     [u.count] = byte count
 12764                              <1> 	;     [u.pcount] = byte count within page frame 			
 12765                              <1> 	; OUTPUTS -> 
 12766                              <1> 	;     ESI = user data offset (r1)
 12767                              <1> 	;     EDI = system (I/O) buffer offset (r2)
 12768                              <1> 	;     ECX = byte count (r3)
 12769                              <1> 	;     EAX = remain bytes after byte count within page frame
 12770                              <1> 	;	(If EAX > 0, transfer will continue from the next page)
 12771                              <1>         ;
 12772                              <1> 	; ((Modified registers:  EDX))
 12773                              <1>  
 12774 0001104F 8B35[74030300]      <1>         mov     esi, [u.fofp]
 12775 00011055 8B3E                <1>         mov     edi, [esi]
 12776 00011057 89F9                <1> 	mov	ecx, edi
 12777 00011059 81C900FEFFFF        <1> 	or	ecx, 0FFFFFE00h
 12778 0001105F 81E7FF010000        <1> 	and	edi, 1FFh
 12779 00011065 01DF                <1> 	add	edi, ebx ; EBX = system buffer (data) address
 12780 00011067 F7D9                <1> 	neg	ecx
 12781 00011069 3B0D[88030300]      <1> 	cmp	ecx, [u.count]
 12782 0001106F 7606                <1> 	jna	short sioreg_0
 12783 00011071 8B0D[88030300]      <1> 	mov	ecx, [u.count]
 12784                              <1> sioreg_0:
 12785 00011077 803D[C6030300]00    <1> 	cmp	byte [u.kcall], 0 
 12786 0001107E 7613                <1> 	jna	short sioreg_1
 12787                              <1> 	 ; the caller is 'mkdir' or 'namei'
 12788 00011080 A1[84030300]        <1> 	mov	eax, [u.base]
 12789 00011085 A3[C0030300]        <1> 	mov 	[u.pbase], eax ; physical address = virtual address
 12790 0001108A 66890D[C4030300]    <1> 	mov	word [u.pcount], cx ; remain bytes in buffer (1 sector)
 12791 00011091 EB0B                <1> 	jmp	short sioreg_2
 12792                              <1> sioreg_1:
 12793 00011093 0FB715[C4030300]    <1> 	movzx	edx, word [u.pcount]
 12794 0001109A 39D1                <1> 	cmp	ecx, edx	
 12795 0001109C 772A                <1> 	ja	short sioreg_4 ; transfer count > [u.pcount]
 12796                              <1> sioreg_2: ; 2:
 12797 0001109E 31C0                <1> 	xor 	eax, eax
 12798                              <1> sioreg_3:
 12799 000110A0 010D[8C030300]      <1> 	add 	[u.nread], ecx
 12800 000110A6 290D[88030300]      <1> 	sub 	[u.count], ecx
 12801 000110AC 010D[84030300]      <1> 	add 	[u.base], ecx
 12802 000110B2 010E                <1>         add 	[esi], ecx 
 12803 000110B4 8B35[C0030300]      <1> 	mov	esi, [u.pbase]
 12804 000110BA 66290D[C4030300]    <1> 	sub	[u.pcount], cx
 12805 000110C1 010D[C0030300]      <1> 	add	[u.pbase], ecx
 12806 000110C7 C3                  <1>         retn
 12807                              <1> sioreg_4:
 12808                              <1> 	; transfer count > [u.pcount] 
 12809                              <1> 	; (ecx > edx)
 12810 000110C8 89C8                <1> 	mov	eax, ecx
 12811 000110CA 29D0                <1> 	sub	eax, edx ; remain bytes for 1 sector (block) transfer 
 12812 000110CC 89D1                <1> 	mov	ecx, edx ; current transfer count = [u.pcount]
 12813 000110CE EBD0                <1> 	jmp	short sioreg_3
 12814                              <1> 
 12815                              <1> tswitch: ; Retro UNIX 386 v1
 12816                              <1> tswap:
 12817                              <1> 	; 16/01/2017
 12818                              <1> 	; 21/05/2016 - TRDOS 386 (TRDOS v2.0)
 12819                              <1> 	; 10/05/2015 - 01/09/2015 (Retro UNIX 386 v1)
 12820                              <1> 	; 14/04/2013 - 14/02/2014 (Retro UNIX 8086 v1)
 12821                              <1> 	; time out swap, called when a user times out.
 12822                              <1> 	; the user is put on the low priority queue.
 12823                              <1> 	; This is done by making a link from the last user
 12824                              <1> 	; on the low priority queue to him via a call to 'putlu'.
 12825                              <1> 	; then he is swapped out.
 12826                              <1> 
 12827                              <1> 	; TRDOS 386 (TRDOS v2.0) modification ->  ** 21/05/2016 **
 12828                              <1> 	;     * when a high priority (event) process will be stopped
 12829                              <1> 	;	(swapped out, swithched out/off), 'tswap/tswitch' will
 12830                              <1> 	;	not add it to a run queue. 
 12831                              <1> 	;	/// What for: Process may be already in a run queue, 
 12832                              <1> 	;	it is unspeficied state because process might be started
 12833                              <1> 	;	by a timer event which does not regard previous priority
 12834                              <1> 	;	level and run queue of the process (for fast executing!).
 12835                              <1> 	;	After the 'run for event', process will be sequenced
 12836                              <1> 	;	to run by it's actual run queue. ///
 12837                              <1> 	;
 12838                              <1> 	; Retro UNIX 386 v1 modification ->
 12839                              <1> 	;       swap (software task switch) is performed by changing
 12840                              <1> 	;	user's page directory (u.pgdir) instead of segment change
 12841                              <1> 	;	as in Retro UNIX 8086 v1.
 12842                              <1> 	;
 12843                              <1> 	; RETRO UNIX 8086 v1 modification ->
 12844                              <1> 	;       'swap to disk' is replaced with 'change running segment'
 12845                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
 12846                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
 12847                              <1> 	;	compatibles was using 1MB segmented memory 
 12848                              <1> 	;	in 8086/8088 times.
 12849                              <1> 	;
 12850                              <1> 	; INPUTS ->
 12851                              <1> 	;    u.uno - users process number
 12852                              <1> 	;    runq+4 - lowest priority queue
 12853                              <1> 	; OUTPUTS ->
 12854                              <1> 	;    r0 - users process number
 12855                              <1> 	;    r2 - lowest priority queue address
 12856                              <1> 	;
 12857                              <1> 	; ((AX = R0, BX = R2)) output
 12858                              <1> 	; ((Modified registers: EDX, EBX, ECX, ESI, EDI))  	
 12859                              <1> 	;
 12860                              <1> 
 12861                              <1> 	NOTE:
 12862                              <1> 	;* [u.pri] priority level is specified by run queue which is process 
 12863                              <1> 	;  comes to run from.
 12864                              <1> 	;* Initial [u.pri] is 1 ('normal/regular') for programs 
 12865                              <1> 	;  (which are launched by MainProg or 'sysexec'), it is changed
 12866                              <1> 	;  to 2 ('high') by timer event, if program uses 'systimer' system call.
 12867                              <1> 	;* Program (Process) also can change it's running priority 
 12868                              <1> 	;  from 1 to 0 or up to 2 by using 'syspri' system call; but,
 12869                              <1> 	;  if program selects priority level 2 (high) for running, next time 
 12870                              <1> 	;  it is reduced to 1 (normal/regular) because 'syspri' adds this
 12871                              <1> 	;  program to 'run for normal' queue while running duration is a bit
 12872                              <1> 	;  protected from swap/switch out immediate, behalf of other high 
 12873                              <1> 	;  priority process in sequence. Program (with high priority) will not 
 12874                              <1> 	;  be swapped/switched out (by timer event) before it's time quantum 
 12875                              <1> 	;  will be elapsed, but, this will be temporary if program is not using 
 12876                              <1> 	;  timer event function.	  			 	
 12877                              <1> 
 12878                              <1> 	;For example:
 12879                              <1> 	;If a process frequently gets a timer event, it runs at high priority
 12880                              <1> 	;level but when it returns from running it returns to actual run queue,
 12881                              <1> 	;not to 'run for event' queue again.
 12882                              <1> 	;'tswap' will not change the sequence at return/stop(swap out) stage.
 12883                              <1> 	;But if priority level not high (=2, 'run for event'), 'tswap/tswitch'
 12884                              <1> 	;will add the stopping process to relevant run queue according to
 12885                              <1> 	;[u.pri] priority level.
 12886                              <1> 
 12887                              <1> 	; 16/01/2017
 12888 000110D0 BB[54030300]        <1> 	mov	ebx, runq+2 	; 'runq_normal' ; normal/regular priority
 12889                              <1> 	; 21/05/2016
 12890                              <1> 	;cmp	byte [u.pri], 2	; high priority (run for event) ?
 12891                              <1> 	;jnb	short swap
 12892                              <1> 	; 16/01/2017
 12893                              <1> 	; (Normal and also high/event priority processes will be added to
 12894                              <1> 	; normal priority run queue for ensuring circular running sequence!)
 12895                              <1> 	; (Timer interrupt or 'syspri' system call may change priority and run
 12896                              <1> 	; queue to high/event level.)
 12897 000110D5 803D[A9030300]00    <1> 	cmp	byte [u.pri], 0
 12898 000110DC 7702                <1> 	ja	short tswap_1	; normal priority run queue
 12899                              <1> 	;
 12900 000110DE 43                  <1> 	inc	ebx
 12901 000110DF 43                  <1> 	inc	ebx		; runq+4, 'runq_background', low priority
 12902                              <1> tswap_1:
 12903 000110E0 A0[B3030300]        <1> 	mov 	al, [u.uno]
 12904                              <1> 	       	; movb u.uno,r1 / move users process number to r1
 12905                              <1> 		; mov  $runq+4,r2 
 12906                              <1> 			; / move lowest priority queue address to r2
 12907                              <1>       	; ebx = run queue
 12908 000110E5 E8FE000000          <1> 	call 	putlu
 12909                              <1> 		; jsr r0,putlu / create link from last user on Q to 
 12910                              <1> 		             ; / u.uno's user
 12911                              <1> 
 12912                              <1> switch: ; Retro UNIX 386 v1
 12913                              <1> swap:
 12914                              <1> 	; 02/01/2017
 12915                              <1> 	; 21/05/2016
 12916                              <1> 	; 20/05/2016
 12917                              <1> 	; 02/05/2016
 12918                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
 12919                              <1> 	; 10/05/2015 - 02/09/2015 (Retro UNIX 386 v1)
 12920                              <1> 	; 14/04/2013 - 08/03/2014 (Retro UNIX 8086 v1)
 12921                              <1> 	;
 12922                              <1> 	; 'swap' is routine that controls the swapping of processes
 12923                              <1> 	; in and out of core.
 12924                              <1> 	;
 12925                              <1> 	; TRDOS 386 (TRDOS v2.0) modification ->  ** 20/05/2016 **
 12926                              <1> 	;     * 3 different priority level is applied 
 12927                              <1> 	;	(just as original unix v1)
 12928                              <1> 	;	1) high priority (event) run queue, 'runq_event'
 12929                              <1> 	;	2) normal priority (regular) run queue, 'runq_normal'
 12930                              <1> 	;	3) low priority (background) run queue, 'runq_backgroud'
 12931                              <1> 	;	'swap' code will run a process which has max. priority
 12932                              <1>         ;       (for earliest event at first)
 12933                              <1> 	;
 12934                              <1> 	; Retro UNIX 386 v1 modification ->
 12935                              <1> 	;       swap (software task switch) is performed by changing
 12936                              <1> 	;	user's page directory (u.pgdir) instead of segment change
 12937                              <1> 	;	as in Retro UNIX 8086 v1.
 12938                              <1> 	;
 12939                              <1> 	; RETRO UNIX 8086 v1 modification ->
 12940                              <1> 	;       'swap to disk' is replaced with 'change running segment'
 12941                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
 12942                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
 12943                              <1> 	;	compatibles was using 1MB segmented memory 
 12944                              <1> 	;	in 8086/8088 times.
 12945                              <1> 	;
 12946                              <1> 	; INPUTS ->
 12947                              <1> 	;    runq table - contains processes to run.
 12948                              <1> 	;    p.link - contains next process in line to be run.
 12949                              <1> 	;    u.uno - process number of process in core	
 12950                              <1> 	;    s.stack - swap stack used as an internal stack for swapping.	
 12951                              <1> 	; OUTPUTS ->
 12952                              <1> 	;    (original unix v1 -> present process to its disk block)
 12953                              <1> 	;    (original unix v1 -> new process into core -> 
 12954                              <1> 	;	   Retro Unix 8086 v1 -> segment registers changed 
 12955                              <1> 	;	   for new process)
 12956                              <1> 	;    u.quant = 3 (Time quantum for a process)
 12957                              <1> 	; 	((INT 1Ch count down speed -> 18.2 times per second)	 	
 12958                              <1> 	;    RETRO UNIX 8086 v1 will use INT 1Ch (18.2 times per second)
 12959                              <1> 	;	 for now, it will swap the process if there is not
 12960                              <1> 	;	 a keyboard event (keystroke) (Int 15h, function 4Fh)
 12961                              <1> 	;	 or will count down from 3 to 0 even if there is a
 12962                              <1> 	;        keyboard event locking due to repetitive key strokes.
 12963                              <1> 	;	 u.quant will be reset to 3 for RETRO UNIX 8086 v1.
 12964                              <1> 	;
 12965                              <1> 	; ((Modified registers: EAX, EDX, EBX, ECX, ESI, EDI))  	
 12966                              <1> 
 12967                              <1> 	;NOTE:
 12968                              <1> 	;High priority queue is the first for selecting a process to run.
 12969                              <1> 	;If there is not a process in high priority level run queue,
 12970                              <1> 	;a process in normal priority run queue will be selected
 12971                              <1> 	;or a proces in low priority run queue will be selected if normal
 12972                              <1> 	;priority level run queue is empty.
 12973                              <1> 	
 12974                              <1> 	; 21/05/2016 -(3 priority levels, 3 run queues)
 12975 000110EA BE[52030300]        <1> 	mov	esi, runq ; 'runq_event' ; high priority, 'run for event'
 12976 000110EF C605[208E0100]03    <1> 	mov	byte [priority], 3 ; high priority + 1
 12977 000110F6 31DB                <1> 	xor	ebx, ebx ; 02/01/2017
 12978                              <1> swap_0: ; 1: / search runq table for highest priority process
 12979 000110F8 66AD                <1> 	lodsw  ; mov ax, [esi], add esi+2
 12980                              <1> 	;xor	ebx, ebx ; 02/05/2016
 12981 000110FA 6621C0              <1> 	and 	ax, ax ; are there any processes to run in this Q entry
 12982 000110FD 750E                <1> 	jnz	short swap_2 
 12983                              <1> 	; 21/05/2026
 12984                              <1> 	; runq_normal = runq+2, runq_background = runq+4
 12985 000110FF FE0D[208E0100]      <1> 	dec	byte [priority] ; 3 -> 3, 2 -> 1, 1-> 0
 12986 00011105 75F1                <1> 	jnz	short swap_0	
 12987                              <1> 	;cmp	esi, runq+6  ; if zero compare address to end of table
 12988                              <1> 	;jb	short swap_0 ; if not at end, go back
 12989                              <1> swap_1:
 12990                              <1> 	; 02/05/2016
 12991                              <1> 	; 29/04/2016 (TRDOS 386 = TRDOS v2.0)
 12992                              <1> 	; No user process to run...
 12993                              <1> 	; Run the kernel process... MainProg: Internal Command Interpreter  
 12994 00011107 FEC0                <1> 	inc	al ; mov al, 1  ; process number of MainProg
 12995 00011109 FEC3                <1> 	inc	bl ; mov bl, al ; 1
 12996 0001110B EB1E                <1> 	jmp	short swap_4
 12997                              <1> swap_2:
 12998                              <1> 	; 21/05/2016
 12999 0001110D FE0D[208E0100]      <1> 	dec	byte [priority] ; priority level of present user/process
 13000                              <1> 			        ; 0, 1, 2	   
 13001 00011113 4E                  <1> 	dec	esi
 13002 00011114 4E                  <1>         dec     esi
 13003                              <1> 	;
 13004 00011115 88C3                <1> 	mov	bl, al
 13005 00011117 38E0                <1> 	cmp	al, ah ; is there only 1 process in the queue to be run
 13006 00011119 740A                <1> 	je	short swap_3 ; yes
 13007 0001111B 8AA3[9F000300]      <1> 	mov	ah, [ebx+p.link-1] 
 13008 00011121 8826                <1>        	mov	[esi], ah ; move next process in line into run queue
 13009 00011123 EB06                <1> 	jmp	short swap_4
 13010                              <1> swap_3: 
 13011 00011125 6631D2              <1> 	xor	dx, dx
 13012 00011128 668916              <1> 	mov	[esi], dx ; zero the entry; no processes on the Q
 13013                              <1> swap_4: 
 13014 0001112B 8A25[B3030300]      <1> 	mov 	ah, [u.uno]
 13015 00011131 38C4                <1> 	cmp	ah, al ; is this process the same as the process in core?
 13016 00011133 743B                <1>        	je	short swap_8 ; yes, don't have to swap
 13017 00011135 08E4                <1> 	or	ah, ah  ; is the process # = 0
 13018 00011137 740D                <1>        	jz	short swap_6 ; 'sysexit'
 13019                              <1> 	;cmp	ah, al ;is this process the same as the process in core?
 13020                              <1>        	;je	short swap_8 ; yes, don't have to swap
 13021 00011139 8925[60030300]      <1> 	mov	[u.usp], esp ; return  address for 'syswait' & 'sleep'
 13022 0001113F E834000000          <1> 	call	wswap   ; write out core to disk
 13023 00011144 EB1C                <1> 	jmp 	short swap_7
 13024                              <1> swap_6:
 13025                              <1> 	; Deallocate memory pages belong to the process
 13026                              <1> 	; which is being terminated.
 13027                              <1> 	; (Retro UNIX 386 v1 modification !)
 13028                              <1> 	;
 13029 00011146 53                  <1> 	push	ebx
 13030 00011147 A1[B8030300]        <1> 	mov 	eax, [u.pgdir]  ; page directory of the process
 13031 0001114C 8B1D[BC030300]      <1> 	mov	ebx, [u.ppgdir] ; page directory of the parent process
 13032 00011152 E8AB4BFFFF          <1> 	call	deallocate_page_dir
 13033 00011157 A1[B4030300]        <1> 	mov	eax, [u.upage] ; 'user' structure page of the process
 13034 0001115C E8464CFFFF          <1> 	call	deallocate_page
 13035 00011161 5B                  <1> 	pop	ebx
 13036                              <1> swap_7: 
 13037 00011162 C0E302              <1> 	shl	bl, 2 ; * 4 
 13038 00011165 8B83[BC000300]      <1> 	mov	eax, [ebx+p.upage-4] ; the 'u' page of the new process
 13039 0001116B E840000000          <1> 	call	rswap ; read new process into core
 13040                              <1> swap_8: 
 13041                              <1> 	; Retro UNIX  8086 v1 modification !
 13042 00011170 C605[A8030300]04    <1> 	mov	byte [u.quant], time_count 
 13043 00011177 C3                  <1> 	retn
 13044                              <1> 
 13045                              <1> wswap:  ; < swap out, swap to disk >
 13046                              <1> 	; 28/02/2017 (fnsave)
 13047                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
 13048                              <1> 	; 09/05/2015 (Retro UNIX 386 v1)
 13049                              <1> 	; 26/05/2013 - 08/03/2014 (Retro UNIX 8086 v1)
 13050                              <1> 	; 'wswap' writes out the process that is in core onto its 
 13051                              <1> 	; appropriate disk area.
 13052                              <1> 	;
 13053                              <1> 	; Retro UNIX 386 v1 modification ->
 13054                              <1> 	;       User (u) structure content and the user's register content
 13055                              <1> 	;	will be copied to the process's/user's UPAGE (a page for
 13056                              <1> 	;	saving 'u' structure and user registers for task switching).
 13057                              <1> 	;	u.usp - points to kernel stack address which contains
 13058                              <1> 	;		user's registers while entering system call.  
 13059                              <1> 	;	u.sp  - points to kernel stack address 
 13060                              <1> 	;		to return from system call -for IRET-.
 13061                              <1> 	;	[u.usp]+32+16 = [u.sp] 
 13062                              <1> 	;	[u.usp] -> edi, esi, ebp, esp (= [u.usp]+32), ebx, 
 13063                              <1> 	;		edx, ecx, eax, gs, fs, es, ds, -> [u.sp].
 13064                              <1> 	;
 13065                              <1> 	; Retro UNIX 8086 v1 modification ->
 13066                              <1> 	;       'swap to disk' is replaced with 'change running segment'
 13067                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
 13068                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
 13069                              <1> 	;	compatibles was using 1MB segmented memory 
 13070                              <1> 	;	in 8086/8088 times.
 13071                              <1> 	;
 13072                              <1> 	; INPUTS ->
 13073                              <1> 	;    u.break - points to end of program
 13074                              <1> 	;    u.usp - stack pointer at the moment of swap
 13075                              <1> 	;    core - beginning of process program		
 13076                              <1> 	;    ecore - end of core 	
 13077                              <1> 	;    user - start of user parameter area		
 13078                              <1> 	;    u.uno - user process number	
 13079                              <1> 	;    p.dska - holds block number of process	
 13080                              <1> 	; OUTPUTS ->
 13081                              <1> 	;    swp I/O queue
 13082                              <1> 	;    p.break - negative word count of process 
 13083                              <1> 	;    r1 - process disk address	
 13084                              <1> 	;    r2 - negative word count
 13085                              <1> 	;
 13086                              <1> 	; RETRO UNIX 8086 v1 input/output:
 13087                              <1> 	;
 13088                              <1> 	; INPUTS ->
 13089                              <1> 	;    u.uno - process number (to be swapped out)
 13090                              <1> 	; OUTPUTS ->
 13091                              <1> 	;    none
 13092                              <1> 	;
 13093                              <1> 	;   ((Modified registers: ECX, ESI, EDI))  
 13094                              <1> 	;
 13095                              <1> 
 13096                              <1> 	; 28/02/2017
 13097                              <1> 	;cmp	byte [multi_tasking], 0  ; Musti tasking mode ?
 13098                              <1> 	;jna	short wswp
 13099 00011178 803D[DA030300]00    <1> 	cmp	byte [u.fpsave], 0 ; 28/02/2017
 13100 0001117F 7606                <1> 	jna	short wswp
 13101 00011181 DD35[DC030300]      <1> 	fnsave	[u.fpregs] ; save floating point registers (94 bytes)
 13102                              <1> wswp:
 13103 00011187 8B3D[B4030300]      <1> 	mov	edi, [u.upage] ; process's user (u) structure page addr
 13104 0001118D B938000000          <1> 	mov	ecx, (U_SIZE + 3) / 4
 13105 00011192 BE[5C030300]        <1> 	mov	esi, user ; active user (u) structure	
 13106 00011197 F3A5                <1> 	rep	movsd
 13107                              <1> 	;
 13108 00011199 8B35[60030300]      <1> 	mov	esi, [u.usp] ; esp (system stack pointer, 
 13109                              <1> 			     ;      points to user registers)
 13110 0001119F 8B0D[5C030300]      <1> 	mov	ecx, [u.sp]  ; return address from the system call
 13111                              <1> 			     ; (for IRET)
 13112                              <1> 			     ; [u.sp] -> EIP (user)
 13113                              <1> 			     ; [u.sp+4]-> CS (user)
 13114                              <1> 			     ; [u.sp+8] -> EFLAGS (user)
 13115                              <1> 			     ; [u.sp+12] -> ESP (user)
 13116                              <1> 			     ; [u.sp+16] -> SS (user)	
 13117 000111A5 29F1                <1> 	sub	ecx, esi     ; required space for user registers
 13118 000111A7 83C114              <1> 	add	ecx, 20	     ; +5 dwords to return from system call
 13119                              <1> 			     ; (for IRET) 	
 13120 000111AA C1E902              <1> 	shr	ecx, 2	     		
 13121 000111AD F3A5                <1> 	rep	movsd
 13122 000111AF C3                  <1> 	retn
 13123                              <1> 
 13124                              <1> rswap:  ; < swap in, swap from disk >
 13125                              <1> 	; 28/02/2017 (frstor)
 13126                              <1> 	; 15/01/2017
 13127                              <1> 	; 14/01/2017
 13128                              <1> 	; 21/05/2016
 13129                              <1> 	; 03/05/2016
 13130                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
 13131                              <1> 	; 09/05/2015 - 15/09/2015 (Retro UNIX 386 v1)
 13132                              <1> 	; 26/05/2013 - 08/03/2014 (Retro UNIX 8086 v1)
 13133                              <1> 	; 'rswap' reads a process whose number is in r1, 
 13134                              <1> 	; from disk into core.
 13135                              <1> 	;
 13136                              <1> 	; Retro UNIX 386 v1 modification ->
 13137                              <1> 	;       User (u) structure content and the user's register content
 13138                              <1> 	;	will be restored from process's/user's UPAGE (a page for
 13139                              <1> 	;	saving 'u' structure and user registers for task switching).
 13140                              <1> 	;	u.usp - points to kernel stack address which contains
 13141                              <1> 	;		user's registers while entering system call.  
 13142                              <1> 	;	u.sp  - points to kernel stack address 
 13143                              <1> 	;		to return from system call -for IRET-.
 13144                              <1> 	;	[u.usp]+32+16 = [u.sp] 
 13145                              <1> 	;	[u.usp] -> edi, esi, ebp, esp (= [u.usp]+32), ebx, 
 13146                              <1> 	;		edx, ecx, eax, gs, fs, es, ds, -> [u.sp].
 13147                              <1> 	;
 13148                              <1> 	; RETRO UNIX 8086 v1 modification ->
 13149                              <1> 	;       'swap to disk' is replaced with 'change running segment'
 13150                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
 13151                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
 13152                              <1> 	;	compatibles was using 1MB segmented memory 
 13153                              <1> 	;	in 8086/8088 times.
 13154                              <1> 	;
 13155                              <1> 	; INPUTS ->
 13156                              <1> 	;    r1 - process number of process to be read in
 13157                              <1> 	;    p.break - negative of word count of process 
 13158                              <1> 	;    p.dska - disk address of the process		
 13159                              <1> 	;    u.emt - determines handling of emt's 	
 13160                              <1> 	;    u.ilgins - determines handling of illegal instructions		
 13161                              <1> 	; OUTPUTS ->
 13162                              <1> 	;    8 = (u.ilgins)
 13163                              <1> 	;    24 = (u.emt)
 13164                              <1> 	;    swp - bit 10 is set to indicate read 
 13165                              <1> 	;		(bit 15=0 when reading is done)	
 13166                              <1> 	;    swp+2 - disk block address
 13167                              <1> 	;    swp+4 - negative word count 	
 13168                              <1> 	;      ((swp+6 - address of user structure)) 
 13169                              <1> 	;
 13170                              <1> 	; RETRO UNIX 8086 v1 input/output:
 13171                              <1> 	;
 13172                              <1> 	; INPUTS ->
 13173                              <1> 	;    AL	- new process number (to be swapped in)	 
 13174                              <1> 	; OUTPUTS ->
 13175                              <1> 	;    none
 13176                              <1> 	;
 13177                              <1> 	;   ((Modified registers: EAX, ECX, ESI, EDI, ESP)) 
 13178                              <1> 	;
 13179                              <1> 	; Retro UNIX 386 v1 - modification ! 14/05/2015
 13180 000111B0 89C6                <1> 	mov	esi, eax  ; process's user (u) structure page addr
 13181 000111B2 B938000000          <1> 	mov	ecx, (U_SIZE + 3) / 4
 13182 000111B7 BF[5C030300]        <1> 	mov	edi, user ; active user (u) structure	
 13183 000111BC F3A5                <1> 	rep	movsd
 13184 000111BE 58                  <1> 	pop	eax	; 'rswap' return address
 13185                              <1> 	; 
 13186                              <1> 	;cli
 13187 000111BF 8B3D[60030300]      <1> 	mov	edi, [u.usp] ; esp (system stack pointer, 
 13188                              <1> 			     ;     points to user registers)
 13189 000111C5 89FC                <1> 	mov	esp, edi     ; 14/01/2017
 13190 000111C7 8B0D[5C030300]      <1> 	mov	ecx, [u.sp]  ; return address from the system call
 13191                              <1> 			     ; (for IRET)
 13192                              <1> 			     ; [u.sp] -> EIP (user)
 13193                              <1> 			     ; [u.sp+4]-> CS (user)
 13194                              <1> 			     ; [u.sp+8] -> EFLAGS (user)
 13195                              <1> 			     ; [u.sp+12] -> ESP (user)
 13196                              <1> 			     ; [u.sp+16] -> SS (user)		
 13197 000111CD 29F9                <1> 	sub	ecx, edi     ; required space for user registers
 13198 000111CF 83C114              <1> 	add	ecx, 20	     ; +5 dwords to return from system call
 13199                              <1> 			     ; (for IRET) 	
 13200 000111D2 C1E902              <1> 	shr	ecx, 2	       		
 13201 000111D5 F3A5                <1> 	rep	movsd
 13202                              <1> 	;mov	esp, [u.usp] ; 15/09/2015
 13203                              <1> 	;sti
 13204                              <1> 	; 28/02/2017
 13205                              <1> 	;cmp	byte [multi_tasking], 0  ; Musti tasking mode ?
 13206                              <1> 	;jna	short rswp_retn
 13207 000111D7 803D[DA030300]00    <1> 	cmp	byte [u.fpsave], 0
 13208 000111DE 7606                <1> 	jna	short rswp_retn
 13209 000111E0 DD25[DC030300]      <1> 	frstor	[u.fpregs] ; restore floating point regs (94 bytes)
 13210                              <1> rswp_retn:
 13211 000111E6 50                  <1> 	push	eax	; 'rswap' return address
 13212 000111E7 C3                  <1> 	retn
 13213                              <1> 
 13214                              <1> putlu: 
 13215                              <1> 	; 20/05/2016
 13216                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
 13217                              <1> 	; 10/05/2015 - 12/09/2015 (Retro UNIX 386 v1)
 13218                              <1> 	; 15/04/2013 - 23/02/2014 (Retro UNIX 8086 v1)
 13219                              <1> 	; 'putlu' is called with a process number in r1 and a pointer
 13220                              <1> 	; to lowest priority Q (runq+4) in r2. A link is created from
 13221                              <1> 	; the last process on the queue to process in r1 by putting
 13222                              <1> 	; the process number in r1 into the last process's link.
 13223                              <1> 	;
 13224                              <1> 	; INPUTS ->
 13225                              <1> 	;    r1 - user process number
 13226                              <1> 	;    r2 - points to lowest priority queue 
 13227                              <1> 	;    p.dska - disk address of the process		
 13228                              <1> 	;    u.emt - determines handling of emt's 	
 13229                              <1> 	;    u.ilgins - determines handling of illegal instructions		
 13230                              <1> 	; OUTPUTS ->
 13231                              <1> 	;    r3 - process number of last process on the queue upon
 13232                              <1> 	;	  entering putlu
 13233                              <1> 	;    p.link-1 + r3 - process number in r1
 13234                              <1> 	;    r2 - points to lowest priority queue
 13235                              <1> 	;
 13236                              <1> 	; ((Modified registers: EDX, EBX)) 
 13237                              <1> 	;
 13238                              <1> 	; / r1 = user process no.; r2 points to lowest priority queue
 13239                              <1> 
 13240                              <1> 	; EBX = r2
 13241                              <1> 	; EAX = r1 (AL=r1b)
 13242                              <1> 
 13243                              <1> 	; 20/05/2016
 13244                              <1> 	; AL = process number (1 to 16) // Retro UNIX 8086, 386 v1 // 
 13245                              <1> 	;     (max. 16 processes available for current kernel version) 
 13246                              <1> 	; EBX = run queue address ; 20/05/2016 (TRDOS 386)
 13247                              <1> 		; which is one of following addresses:
 13248                              <1> 		;  1) 'runq_event' high priority run queue	 	
 13249                              <1> 		;  2) 'runq_normal' normal/regular priority run queue
 13250                              <1> 		;  3) 'runq_background' low priority run queue
 13251                              <1> 
 13252                              <1> 	;mov	ebx, runq
 13253 000111E8 0FB613              <1> 	movzx  	edx, byte [ebx]
 13254 000111EB 43                  <1> 	inc	ebx
 13255 000111EC 20D2                <1> 	and	dl, dl
 13256                              <1> 		; tstb (r2)+ / is queue empty?
 13257 000111EE 740A                <1>        	jz	short putlu_1
 13258                              <1> 		; beq 1f / yes, branch
 13259 000111F0 8A13                <1> 	mov 	dl, [ebx] ; 12/09/2015
 13260                              <1> 		; movb (r2),r3 / no, save the "last user" process number
 13261                              <1> 			     ; / in r3
 13262 000111F2 8882[9F000300]      <1>        	mov	[edx+p.link-1], al
 13263                              <1> 		; movb r1,p.link-1(r3) / put pointer to user on 
 13264                              <1> 			     ; / "last users" link
 13265 000111F8 EB03                <1> 	jmp	short putlu_2
 13266                              <1> 		; br 2f /
 13267                              <1> putlu_1: ; 1:
 13268 000111FA 8843FF              <1> 	mov	[ebx-1], al
 13269                              <1>        		; movb r1,-1(r2) / user is only user; 
 13270                              <1> 			    ; / put process no. at beginning and at end
 13271                              <1> putlu_2: ; 2: 
 13272 000111FD 8803                <1> 	mov	[ebx], al
 13273                              <1>        		; movb r1,(r2) / user process in r1 is now the last entry
 13274                              <1> 			     ; / on the queue
 13275 000111FF 88C2                <1> 	mov	dl, al
 13276 00011201 88B2[9F000300]      <1>         mov     [edx+p.link-1], dh ; 0
 13277                              <1> 		; dec r2 / restore r2
 13278 00011207 C3                  <1>         retn
 13279                              <1> 		; rts r0
 13280                              <1> 
 13281                              <1> sysver:
 13282                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
 13283 00011208 C705[64030300]0002- <1> 	mov	dword [u.r0], 200h ; AH = major version, AL = minor version 
 13283 00011210 0000                <1>
 13284 00011212 E9D5C6FFFF          <1> 	jmp	sysret
 13285                              <1> 
 13286                              <1> 
 13287                              <1> syspri: ; change running priority (of the process)
 13288                              <1> 	; 21/05/2016
 13289                              <1> 	; 20/05/2026 - TRDOS 386 (TRDOS v2.0)
 13290                              <1> 	; INPUT ->
 13291                              <1> 	;	BL = priority level
 13292                              <1> 	;	   0 = low running priority (running on background)
 13293                              <1> 	;	   1 = normal/regular priority (running as regular)
 13294                              <1> 	;	   2 = high/event priority (running for event)
 13295                              <1> 	;	   >2 = invalid, it will accepted as 2 (event)
 13296                              <1> 	;	   0FFh = get/return current running priority only	
 13297                              <1> 	; OUTPUT -> 	
 13298                              <1> 	;	* if current [u.pri] < 2
 13299                              <1> 	;	  if BL input < 0FFh ->
 13300                              <1> 	;	     [u.pri] is updated as in BL input (0,1,2)
 13301                              <1> 	;	  if BL input = 0FFh -> AL = [u.pri] (current)
 13302                              <1> 	;	      
 13303                              <1> 	;	* if current [u.pri] = 2
 13304                              <1> 	;	  if BL input < 0FFh -> cf = 1 & AL = 2
 13305                              <1> 	;	  if BL input = 0FFh -> cf = 0 & AL = 2  
 13306                              <1> 	;	
 13307                              <1> 	;	NOTE: 	
 13308                              <1> 	;	If [u.pri] = 2, it can not be changed to 1 or 0;
 13309                              <1> 	;	because, run queue of the running process is unspecified
 13310                              <1> 	;	at this	stage. Process might be started by a timer event
 13311                              <1> 	;	or priority might be changed to high by previous
 13312                              <1> 	;	'syspri' system	call. In both cases, the process is in
 13313                              <1> 	;	'runq_normal' or 'runq_background' queue.
 13314                              <1> 	;	As result of this fact, when the [u.quant] time quantum
 13315                              <1> 	;	of the process is elapsed or 'sysrele' system call is
 13316                              <1> 	;	instructed by the process, 'tswap' ('tswitch') procedure
 13317                              <1> 	;	will be called (to 'swap' or 'switch' out the procedure)
 13318                              <1> 	;	and it will not call 'putlu' to add the (stopping)
 13319                              <1> 	;	process to relevant run queue when [u.pri] = 2.
 13320                              <1> 	;	(Otherwise, it would be possible to add process to
 13321                              <1> 	;	a run queue while it is already in a run queue, wrongly.)
 13322                              <1>   	;
 13323                              <1> 	;	If [u.pri]< 2, 'tswap/tswitch' procedure will call 
 13324                              <1> 	;	'putlu' to add process to relevant run queue
 13325                              <1> 	;	according to [u.pri] value. ('runq_normal' for 1, 
 13326                              <1> 	;	'runq_background' for 0).
 13327                              <1> 	;
 13328                              <1> 	;	If BL input >= 2 and < 0FFh while [u.pri] < 2,
 13329                              <1> 	;	process will be added to 'runq_normal' queue and
 13330                              <1> 	;	[u.pri] will be set to 2. (in 'syspri' system call)
 13331                              <1> 	;
 13332                              <1> 
 13333 00011217 29C0                <1> 	sub	eax, eax ; 0
 13334 00011219 A3[C8030300]        <1> 	mov	[u.error], eax
 13335                              <1> 
 13336 0001121E A0[A9030300]        <1> 	mov	al, [u.pri]
 13337 00011223 A3[64030300]        <1> 	mov	[u.r0], eax
 13338                              <1> 
 13339 00011228 FEC3                <1> 	inc	bl
 13340 0001122A 0F84BCC6FFFF        <1> 	jz	sysret ; 0FFh -> 0, get priority level
 13341                              <1> 	
 13342 00011230 3C02                <1> 	cmp	al, 2
 13343 00011232 0F8394C6FFFF        <1> 	jnb	error ; CF = 1 & AL = 2 (& last error = 0)
 13344                              <1> 
 13345 00011238 FECB                <1> 	dec	bl
 13346 0001123A 80FB02              <1> 	cmp	bl, 2
 13347 0001123D 7602                <1> 	jna	short syspri_1
 13348 0001123F B302                <1> 	mov	bl, 2
 13349                              <1> syspri_1:
 13350 00011241 881D[A9030300]      <1> 	mov	[u.pri], bl
 13351 00011247 80FB02              <1> 	cmp	bl, 2
 13352 0001124A 0F829CC6FFFF        <1>         jb      sysret
 13353                              <1> 
 13354                              <1> 	; here...
 13355                              <1> 	; Priority of current process has been changed to high
 13356                              <1> 	; ('run for event') but current process will be added to
 13357                              <1> 	; 'run as normal' queue. ('run for event' high priority
 13358                              <1> 	; queue is under control of timer -& RTC- interrupt only!) 
 13359                              <1> 	;
 13360                              <1> 	; (Otherwise, process can fall into black hole!
 13361                              <1> 	; e.g. if it is not in waiting list and it has not got 
 13362                              <1> 	; a timer event and it is not in a run queue!
 13363                              <1> 	; Because, when [u.pri] is 2, 'tswap/tswitch' will not 
 13364                              <1> 	; add the stopping process to a run queue.)
 13365                              <1> 
 13366 00011250 A0[B3030300]        <1> 	mov	al, [u.uno]
 13367 00011255 BB[54030300]        <1> 	mov	ebx, runq_normal ; normal priority !
 13368                              <1> 				 ; [u.pri] is set to high
 13369                              <1> 				 ; but 'runq_event' queue is set
 13370                              <1> 				 ; only by the kernel's timer
 13371                              <1> 				 ; event function (timer interrupt). 
 13372 0001125A E889FFFFFF          <1> 	call	putlu
 13373 0001125F E988C6FFFF          <1> 	jmp	sysret
 13374                              <1> 
 13375                              <1> cpass: ; / get next character from user area of core and put it in AL (r1)
 13376                              <1> 	; 02/05/2016 - TRDOS 386 (TRDOS v2.0)
 13377                              <1> 	; 19/05/2015 - 18/10/2015 (Retro UNIX 386 v1)
 13378                              <1> 	; 14/08/2013 - 20/09/2013 (Retro UNIX 8086 v1)
 13379                              <1> 	; INPUTS -> 
 13380                              <1> 	;     [u.base] = virtual address in user area
 13381                              <1> 	;     [u.count] = byte count (max.)
 13382                              <1> 	;     [u.pcount] = byte count in page (0 = reset)		
 13383                              <1> 	; OUTPUTS -> 
 13384                              <1> 	;     AL = the character which is pointed by [u.base]
 13385                              <1> 	;     zf = 1 -> transfer count has been completed	
 13386                              <1>         ;
 13387                              <1> 	; ((Modified registers:  EAX, EDX, ECX))
 13388                              <1> 	;
 13389 00011264 833D[88030300]00    <1> 	cmp 	dword [u.count], 0  ; have all the characters been transferred
 13390                              <1> 			    	    ; i.e., u.count, # of chars. left
 13391 0001126B 763F                <1> 	jna	short cpass_3	    ; to be transferred = 0?) yes, branch
 13392 0001126D FF0D[88030300]      <1> 	dec	dword [u.count]	    ; no, decrement u.count
 13393                              <1>         ; 19/05/2015 
 13394                              <1> 	;(Retro UNIX 386 v1 - translation from user's virtual address
 13395                              <1> 	;		      to physical address
 13396 00011273 66833D[C4030300]00  <1> 	cmp	word [u.pcount], 0 ; byte count in page = 0 (initial value)
 13397                              <1> 			     ; 1-4095 --> use previous physical base address
 13398                              <1> 			     ; in [u.pbase]
 13399 0001127B 770E                <1> 	ja	short cpass_1
 13400 0001127D 833D[BC030300]00    <1> 	cmp     dword [u.ppgdir], 0 ; is the caller os kernel
 13401 00011284 7427                <1>         je      short cpass_k       ; (sysexec, '/etc/init') ?  (MainProg)
 13402 00011286 E858FDFFFF          <1> 	call	trans_addr_r
 13403                              <1> cpass_1:
 13404 0001128B 66FF0D[C4030300]    <1> 	dec	word [u.pcount]
 13405                              <1> cpass_2: 
 13406 00011292 8B15[C0030300]      <1> 	mov	edx, [u.pbase]
 13407 00011298 8A02                <1> 	mov	al, [edx]	; take the character pointed to 
 13408                              <1> 				; by u.base and put it in r1
 13409 0001129A FF05[8C030300]      <1> 	inc	dword [u.nread] ; increment no. of bytes transferred
 13410 000112A0 FF05[84030300]      <1> 	inc	dword [u.base]  ; increment the buffer address to point to the
 13411                              <1> 			        ; next byte
 13412 000112A6 FF05[C0030300]      <1> 	inc	dword [u.pbase]
 13413                              <1> cpass_3:
 13414 000112AC C3                  <1> 	retn
 13415                              <1> cpass_k:
 13416                              <1> 	; 02/07/2015
 13417                              <1> 	; The caller is os kernel 
 13418                              <1> 	; (get sysexec arguments from kernel's memory space)
 13419 000112AD 8B1D[84030300]      <1> 	mov	ebx, [u.base]
 13420 000112B3 66C705[C4030300]00- <1>         mov     word [u.pcount], PAGE_SIZE ; 4096
 13420 000112BB 10                  <1>
 13421 000112BC 891D[C0030300]      <1> 	mov	[u.pbase], ebx
 13422 000112C2 EBCE                <1> 	jmp	short cpass_2
 13423                              <1> 
 13424                              <1> transfer_to_user_buffer: ; fast transfer
 13425                              <1> 	; 27/05/2016
 13426                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
 13427                              <1> 	;
 13428                              <1> 	; INPUT ->
 13429                              <1> 	;	ESI = source address in system space
 13430                              <1> 	;	EDI = user's buffer address
 13431                              <1> 	;	ECX = transfer (byte) count
 13432                              <1> 	;	[u.pgdir] = user's page directory
 13433                              <1> 	; OUTPUT ->
 13434                              <1> 	;	ECX = actual transfer count
 13435                              <1> 	;	cf = 1 -> error
 13436                              <1> 	;	[u.count] = remain byte count
 13437                              <1> 	;
 13438                              <1> 	; Modified registers: eax, ecx
 13439                              <1> 	;
 13440                              <1> 
 13441 000112C4 21C9                <1> 	and	ecx, ecx
 13442 000112C6 743B                <1> 	jz	short ttub_4
 13443                              <1> 
 13444 000112C8 890D[88030300]      <1> 	mov	[u.count], ecx
 13445                              <1> 	
 13446 000112CE 57                  <1> 	push	edi
 13447 000112CF 56                  <1> 	push	esi
 13448 000112D0 53                  <1> 	push	ebx
 13449 000112D1 52                  <1> 	push	edx
 13450 000112D2 51                  <1> 	push	ecx
 13451                              <1> 
 13452 000112D3 89FB                <1> 	mov	ebx, edi
 13453 000112D5 81C300004000        <1> 	add	ebx, CORE ; 27/05/2016
 13454                              <1> ttub_1:
 13455                              <1> 	; ebx = virtual (linear) address
 13456                              <1> 	; [u.pgdir] = user's page directory
 13457 000112DB E80450FFFF          <1>        	call	get_physical_addr_x ; get physical address
 13458 000112E0 7222                <1> 	jc	short ttub_5
 13459                              <1> 	; eax = physical address 
 13460                              <1> 	; ecx = remain byte count in page (1-4096)
 13461 000112E2 89C7                <1> 	mov	edi, eax
 13462 000112E4 A1[88030300]        <1> 	mov	eax, [u.count]
 13463 000112E9 39C1                <1> 	cmp	ecx, eax
 13464 000112EB 7602                <1> 	jna	short ttub_2
 13465 000112ED 89C1                <1> 	mov	ecx, eax
 13466                              <1> ttub_2:	
 13467 000112EF 29C8                <1> 	sub	eax, ecx
 13468 000112F1 01CB                <1> 	add	ebx, ecx
 13469 000112F3 F3A4                <1> 	rep	movsb
 13470 000112F5 A3[88030300]        <1> 	mov	[u.count], eax
 13471 000112FA 09C0                <1> 	or	eax, eax
 13472 000112FC 75DD                <1> 	jnz	short ttub_1
 13473                              <1> ttub_retn:
 13474                              <1> tfub_retn:
 13475 000112FE 59                  <1> 	pop	ecx ; transfer count = actual transfer count
 13476                              <1> ttub_3:
 13477 000112FF 5A                  <1> 	pop	edx
 13478 00011300 5B                  <1> 	pop	ebx
 13479 00011301 5E                  <1> 	pop	esi
 13480 00011302 5F                  <1> 	pop	edi
 13481                              <1> ttub_4:
 13482 00011303 C3                  <1> 	retn
 13483                              <1> ttub_5:
 13484 00011304 59                  <1> 	pop	ecx
 13485 00011305 2B0D[88030300]      <1> 	sub	ecx, [u.count] ; actual transfer count
 13486 0001130B F9                  <1> 	stc
 13487 0001130C EBF1                <1> 	jmp	short ttub_3
 13488                              <1> 
 13489                              <1> transfer_from_user_buffer: ; fast transfer
 13490                              <1> 	; 27/05/2016
 13491                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
 13492                              <1> 	;
 13493                              <1> 	; INPUT ->
 13494                              <1> 	;	ESI = user's buffer address
 13495                              <1> 	;	EDI = destination address in system space
 13496                              <1> 	;	ECX = transfer (byte) count
 13497                              <1> 	;	[u.pgdir] = user's page directory
 13498                              <1> 	; OUTPUT ->
 13499                              <1> 	;	ecx = actual transfer count
 13500                              <1> 	;	cf = 1 -> error
 13501                              <1> 	;	[u.count] = remain byte count
 13502                              <1> 	;
 13503                              <1> 	; Modified registers: eax, ecx
 13504                              <1> 	;
 13505                              <1> 
 13506 0001130E 21C9                <1> 	and	ecx, ecx
 13507                              <1> 	;jz	short tfub_4
 13508 00011310 74F1                <1> 	jz	short ttub_4
 13509                              <1> 
 13510 00011312 890D[88030300]      <1> 	mov	[u.count], ecx
 13511                              <1> 	
 13512 00011318 57                  <1> 	push	edi
 13513 00011319 56                  <1> 	push	esi
 13514 0001131A 53                  <1> 	push	ebx
 13515 0001131B 52                  <1> 	push	edx
 13516 0001131C 51                  <1> 	push	ecx
 13517                              <1> 
 13518 0001131D 89F3                <1> 	mov	ebx, esi
 13519 0001131F 81C300004000        <1> 	add	ebx, CORE ; 27/05/2016
 13520                              <1> tfub_1:
 13521                              <1> 	; ebx = virtual (linear) address
 13522                              <1> 	; [u.pgdir] = user's page directory
 13523 00011325 E8BA4FFFFF          <1>        	call	get_physical_addr_x ; get physical address
 13524                              <1> 	;jc	short tfub_5
 13525 0001132A 72D8                <1> 	jc	short ttub_5
 13526                              <1> 	; eax = physical address 
 13527                              <1> 	; ecx = remain byte count in page (1-4096)
 13528 0001132C 89C6                <1> 	mov	esi, eax
 13529 0001132E A1[88030300]        <1> 	mov	eax, [u.count]
 13530 00011333 39C1                <1> 	cmp	ecx, eax
 13531 00011335 7602                <1> 	jna	short tfub_2
 13532 00011337 89C1                <1> 	mov	ecx, eax
 13533                              <1> tfub_2:	
 13534 00011339 29C8                <1> 	sub	eax, ecx
 13535 0001133B 01CB                <1> 	add	ebx, ecx
 13536 0001133D F3A4                <1> 	rep	movsb
 13537 0001133F A3[88030300]        <1> 	mov	[u.count], eax
 13538 00011344 09C0                <1> 	or	eax, eax
 13539 00011346 75DD                <1> 	jnz	short tfub_1
 13540                              <1> 
 13541 00011348 EBB4                <1> 	jmp	short tfub_retn
 13542                              <1> 
 13543                              <1> ;tfub_retn:
 13544                              <1> ;	pop	ecx ; transfer count = actual transfer count
 13545                              <1> ;tfub_3:
 13546                              <1> ;	pop	edx
 13547                              <1> ;	pop	ebx
 13548                              <1> ;	pop	esi
 13549                              <1> ;	pop	edi
 13550                              <1> ;tfub_4:
 13551                              <1> ;	retn
 13552                              <1> ;tfub_5:
 13553                              <1> ;	pop	ecx
 13554                              <1> ;	sub	ecx, [u.count] ; actual transfer count
 13555                              <1> ;	stc
 13556                              <1> ;	jmp	short tfub_3
 13557                              <1> 
 13558                              <1> sysfff: ; <Find First File>
 13559                              <1> 	; 17/10/2016
 13560                              <1> 	; 16/10/2016
 13561                              <1> 	; 15/10/2016 TRDOS 386 (TRDOS v2.0) feature only ! 
 13562                              <1> 	;           -derived from TRDOS v1.0, INT_21H.ASM-
 13563                              <1> 	;            ("loc_INT21h_find_first_file")
 13564                              <1> 	; TRDOS 8086 (v1.0)
 13565                              <1>         ; 	07/08/2011 
 13566                              <1>         ;	Find First File
 13567                              <1> 	;	INPUT:
 13568                              <1>         ;	    CX= Attributes
 13569                              <1>         ;	    DS:DX= Pointer to filename
 13570                              <1> 	;	MSDOS OUTPUT:
 13571                              <1> 	;	    DTA: (Default address: PSP offset 80h)
 13572                              <1> 	;	    Offset  Descrription
 13573                              <1> 	;	    0	    Reserved for use find next file
 13574                              <1> 	;	    21	    Attribute of file found
 13575                              <1> 	;	    22	    Time stamp of file
 13576                              <1> 	;	    24	    Date stamp of file
 13577                              <1> 	;	    26	    File size in bytes
 13578                              <1> 	;	    30	    Filename and extension (zero terminated)
 13579                              <1> 	;	If cf = 1:
 13580                              <1> 	;	    Error Codes: (in AX)
 13581                              <1> 	;	    	2 - File not found
 13582                              <1> 	;	       18 - No more files  			
 13583                              <1>         ;
 13584                              <1> 	; TRDOS 386 (v2.0) 
 13585                              <1> 	; 15/10/2016
 13586                              <1> 	;	
 13587                              <1>         ; INPUT ->
 13588                              <1>         ;	   CL = File attributes
 13589                              <1> 	;     	      bit 0 (1) - Read only file (R)
 13590                              <1> 	;             bit 1 (1) - Hidden file (H)
 13591                              <1>         ;             bit 2 (1) - System file (R)
 13592                              <1> 	;             bit 3 (1) - Volume label/name (V)
 13593                              <1>         ;             bit 4 (1) - Subdirectory (D)
 13594                              <1> 	;	      bit 5 (1) - File has been archived (A)
 13595                              <1> 	;	   CH = 0 -> Return basic parameters (24 bytes)
 13596                              <1> 	;	   CH > 0 -> Return FindFile structure/table (128 bytes)
 13597                              <1>         ;          EBX = Pointer to filename (ASCIIZ) -path-
 13598                              <1> 	;	   EDX = File parameters buffer address
 13599                              <1> 	;		(buffer size = 24 bytes if CH input = 0)
 13600                              <1> 	;		(buffer size = 128 bytes if CH input > 0)
 13601                              <1> 	;		 
 13602                              <1> 	; OUTPUT ->
 13603                              <1> 	;	   EAX = 0 if CH input > 0
 13604                              <1> 	;	   EAX = First cluster number of file if CH input = 0	
 13605                              <1> 	;	   EDX = File parameters table/structure address
 13606                              <1> 	;	   Basic Parameters:
 13607                              <1> 	;		Offset  Description
 13608                              <1> 	;		------	---------------
 13609                              <1> 	;		0	File Attributes
 13610                              <1> 	;		1	Ambiguous filename chars are used sign
 13611                              <1> 	;			(0 = filename fits exactly with request)
 13612                              <1> 	;			(>0 = ambiguous filename chars are used)
 13613                              <1> 	;	      	2	Time stamp of file
 13614                              <1> 	;		4	Date stamp of file
 13615                              <1> 	;		6	File size in bytes
 13616                              <1> 	;		10	Short Filename (ASCIIZ, max. 13 bytes)
 13617                              <1> 	;		23	Longname Length (1-255) if existing 
 13618                              <1> 	;  
 13619                              <1> 	;          cf = 1 -> Error code in AL
 13620                              <1> 	;
 13621                              <1> 	; Modified Registers: EAX (at the return of system call)
 13622                              <1> 	;  
 13623                              <1> 	; TR-DOS FindFile (FFF) Structure (128 bytes):
 13624                              <1> 	; 09/10/2011 (DIR.ASM) - 10/02/2016 (trdoskx.s)
 13625                              <1> 	;	
 13626                              <1> 	; Offset	Parameter		Size
 13627                              <1> 	; ------	------------------	-------- 
 13628                              <1> 	; 0		FindFile_Drv		1 byte
 13629                              <1> 	; 1		FindFile_Directory	65 bytes
 13630                              <1> 	; 66		FindFile_Name		13 bytes
 13631                              <1> 	; 79		FindFile_LongNameEntryLength 1 byte
 13632                              <1> 	;Above 80 bytes form
 13633                              <1> 	;TR-DOS Source/Destination File FullName Format/Structure
 13634                              <1> 	; 80		FindFile_AttributesMask 1 word
 13635                              <1> 	; 82		FindFile_DirEntry	32 bytes (*)
 13636                              <1> 	; 114		FindFile_DirFirstCluster 1 double word
 13637                              <1> 	; 118		FindFile_DirCluster	1 double word
 13638                              <1> 	; 122		FindFile_DirEntryNumber 1 word
 13639                              <1> 	; 124		FindFile_MatchCounter	1 word
 13640                              <1> 	; 126		FindFile_Reserved	1 word
 13641                              <1>    	; (*) MS-DOS, FAT 12-16-32 classic directory entry (32 bytes)
 13642                              <1> 
 13643                              <1> 	;mov	[u.namep], ebx
 13644                              <1> 	; 16/10/2016
 13645 0001134A 8915[408E0100]      <1> 	mov	[FFF_UBuffer], edx
 13646 00011350 66890D[458E0100]    <1> 	mov	[FFF_Attrib], cx ; [FFF_RType] = ch
 13647                              <1> 		    ; Attributes in CL, return data type in CH
 13648 00011357 89DE                <1> 	mov	esi, ebx
 13649                              <1> 	; file name is forced, change directory as temporary
 13650                              <1> 	;mov	ax, 1
 13651                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
 13652                              <1> 	;call	set_working_path 
 13653 00011359 E8E2130000          <1> 	call	set_working_path_x ; 17/10/2016	
 13654 0001135E 731D                <1> 	jnc	short sysfff_0
 13655                              <1>  
 13656 00011360 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
 13657 00011362 7505                <1> 	jnz	short sysfff_err
 13658                              <1> 
 13659                              <1> 	; eax = 0
 13660 00011364 B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
 13661                              <1> sysfff_err:
 13662 00011369 A3[64030300]        <1> 	mov	[u.r0], eax
 13663 0001136E A3[C8030300]        <1> 	mov	[u.error], eax
 13664 00011373 E89D140000          <1>         call 	reset_working_path
 13665 00011378 E94FC5FFFF          <1> 	jmp	error
 13666                              <1> 
 13667                              <1> sysfff_0:
 13668                              <1> 	;sub	ah, ah ; ah = 0
 13669 0001137D 8A0424              <1> 	mov	al, [esp]
 13670 00011380 08C0                <1> 	or	al, al
 13671 00011382 7412                <1> 	jz	short sysfff_2
 13672 00011384 B410                <1> 	mov	ah, 10h
 13673 00011386 A808                <1> 	test	al, 08h
 13674 00011388 7503                <1> 	jnz	short sysfff_1
 13675 0001138A 80CC08              <1> 	or	ah, 08h
 13676                              <1> sysfff_1:
 13677 0001138D 2410                <1> 	and	al, 10h ; Directory
 13678 0001138F 7405                <1> 	jz	short sysfff_2
 13679 00011391 80E408              <1> 	and	ah, 08h
 13680 00011394 30C0                <1> 	xor	al, al ; When a directory is searched,
 13681                              <1> 		       ; filename will be returned even if
 13682                              <1> 		       ; it is not a directory!
 13683                              <1> 		       ; Because: (in order to prevent
 13684                              <1> 		       ; creating a dir with existing file name)
 13685                              <1> 		       ; Dir and file names must not be same!
 13686                              <1> 		       ; (return attribute must be checked)  	  	 	
 13687                              <1> sysfff_2:
 13688                              <1> 	; AX = Attributes mask 
 13689                              <1> 		; AL = AND mask (result must be equal to AL)
 13690                              <1> 		; AH = Negative AND mask (result must be ZERO)			
 13691                              <1>  	; ESI = FindFile_Name address
 13692                              <1> 
 13693 00011396 E8D680FFFF          <1> 	call	find_first_file
 13694 0001139B 72CC                <1> 	jc	short sysfff_err ; eax = 2 (File not found !)
 13695                              <1> 
 13696                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
 13697                              <1> 	; EDI = Directory Buffer Directory Entry Location
 13698                              <1> 	; EAX = File Size
 13699                              <1> 	;  BL = Attributes of The File/Directory
 13700                              <1> 	;  BH = Long Name Yes/No Status (>0 is YES)
 13701                              <1> 	;  DX > 0 : Ambiguous filename chars are used
 13702                              <1> 
 13703                              <1> sysfff_3:
 13704                              <1> 	; 16/10/2016
 13705 0001139D 668B0D[458E0100]    <1> 	mov	cx, [FFF_Attrib]
 13706                              <1> 	; Attribs in CL, return data type in CH
 13707                              <1> 
 13708                              <1> 	;or	cl, cl
 13709                              <1> 	;jz	short sysfff_4 ; 0 = No filter
 13710 000113A4 80F1FF              <1> 	xor	cl, 0FFh
 13711 000113A7 20D9                <1> 	and	cl, bl
 13712 000113A9 7409                <1> 	jz	short sysfff_4
 13713                              <1> 
 13714                              <1> 	;mov	eax, 2 ; 'file not found !' error
 13715                              <1> 	;jmp	short sysfff_err_1
 13716                              <1> 
 13717                              <1> 	; 16/10/2016
 13718 000113AB E87081FFFF          <1> 	call	find_next_file
 13719 000113B0 72B7                <1> 	jc	short sysfff_err ; eax = 12 (no more files !)
 13720 000113B2 EBE9                <1> 	jmp	short sysfff_3
 13721                              <1> 
 13722                              <1> sysfff_4:
 13723 000113B4 20ED                <1> 	and	ch, ch ; [FFF_RType]
 13724 000113B6 7412                <1> 	jz	short sysfff_5
 13725 000113B8 B980000000          <1> 	mov	ecx, 128 ; ; transfer length
 13726 000113BD 880D[448E0100]      <1> 	mov	[FFF_Valid], cl
 13727                              <1> sysfnf_11:
 13728 000113C3 BE[F68A0100]        <1> 	mov	esi, FindFile_Drv
 13729 000113C8 EB44                <1> 	jmp	short sysfff_6	
 13730                              <1> sysfff_5:
 13731                              <1> 	;mov	esi, FindFile_DirEntry
 13732 000113CA B918000000          <1> 	mov	ecx, 24  ; transfer length
 13733 000113CF 880D[448E0100]      <1> 	mov	[FFF_Valid], cl
 13734                              <1> sysfnf_12:
 13735 000113D5 BF[00930100]        <1> 	mov	edi, DTA ; FFF data transfer address
 13736                              <1> 	;mov	al, [esi+DirEntry_Attr] ; 11
 13737 000113DA 88D8                <1> 	mov	al, bl ; File/Dir Attributes
 13738 000113DC 887F17              <1> 	mov	[edi+23], bh ; Longname length (0= none)
 13739 000113DF AA                  <1> 	stosb
 13740 000113E0 88D0                <1> 	mov	al, dl ; DL is for '?'
 13741 000113E2 00F0                <1> 	add	al, dh ; DH is for '*'
 13742                              <1> 	; AL > 0 if ambiguous file name wildcards are used
 13743 000113E4 AA                  <1> 	stosb
 13744 000113E5 8B4616              <1> 	mov	eax, [esi+DirEntry_WrtTime] ; 22	
 13745 000113E8 AB                  <1>         stosd	; DirEntry_WrtTime & DirEntry_WrtDate
 13746 000113E9 8B461C              <1>         mov	eax, [esi+DirEntry_FileSize] ; 28
 13747 000113EC AB                  <1>         stosd
 13748 000113ED 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI] ; 20
 13749 000113F1 66C1E010            <1> 	shl	ax, 16
 13750 000113F5 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO] ; 26 
 13751 000113F9 A3[64030300]        <1> 	mov	[u.r0], eax ; First Cluster
 13752                              <1> 
 13753                              <1>         ;mov	esi, FindFile_DirEntry
 13754 000113FE E84F140000          <1> 	call	get_file_name
 13755                              <1> 
 13756 00011403 8A0D[448E0100]      <1> 	mov	cl, [FFF_Valid]
 13757 00011409 BE[00930100]        <1>        	mov	esi, DTA ; FFF data transfer address
 13758                              <1> sysfff_6:
 13759 0001140E 8B3D[408E0100]      <1> 	mov	edi, [FFF_UBuffer] ; user's buffer address (edx)
 13760 00011414 E8ABFEFFFF          <1> 	call	transfer_to_user_buffer
 13761                              <1> 
 13762 00011419 890D[64030300]      <1> 	mov	[u.r0], ecx ; actual transfer count
 13763 0001141F E8F1130000          <1>         call 	reset_working_path
 13764 00011424 E9C3C4FFFF          <1> 	jmp	sysret
 13765                              <1> 
 13766                              <1> sysfnf: ; <Find Next File>
 13767                              <1> 	; 16/10/2016 TRDOS 386 (TRDOS v2.0) feature only ! 
 13768                              <1> 	;           -derived from TRDOS v1.0, INT_21H.ASM-
 13769                              <1> 	;            ("loc_INT21h_find_next_file")
 13770                              <1> 	; TRDOS 8086 (v1.0)
 13771                              <1>         ; 	07/08/2011 
 13772                              <1>         ;	Find First File
 13773                              <1> 	;	INPUT:
 13774                              <1>         ;	    none
 13775                              <1> 	;	MSDOS OUTPUT:
 13776                              <1> 	;	    DTA: (Default address: PSP offset 80h)
 13777                              <1> 	;	    Offset  Descrription
 13778                              <1> 	;	    0	    Reserved for use find next file
 13779                              <1> 	;	    21	    Attribute of file found
 13780                              <1> 	;	    22	    Time stamp of file
 13781                              <1> 	;	    24	    Date stamp of file
 13782                              <1> 	;	    26	    File size in bytes
 13783                              <1> 	;	    30	    Filename and extension (zero terminated)
 13784                              <1> 	;	If cf = 1:
 13785                              <1> 	;	    Error Codes: (in AX)
 13786                              <1> 	;	       18 - No more files  			
 13787                              <1>         ;
 13788                              <1> 	; TRDOS 386 (v2.0) 
 13789                              <1> 	; 16/10/2016
 13790                              <1> 	;	
 13791                              <1>         ; INPUT ->
 13792                              <1>        	; 	   none
 13793                              <1> 	; OUTPUT ->
 13794                              <1> 	;	   EAX = 0 if CH input of 'Find First File' > 0
 13795                              <1> 	;	   EAX = First cluster number of file
 13796                              <1> 	;		 if CH input of 'Find First File' = 0	
 13797                              <1> 	;	   EDX = File parameters table/structure address
 13798                              <1> 	;
 13799                              <1> 	;          cf = 1 -> Error code in AL
 13800                              <1> 	;
 13801                              <1>  	; Modified Registers: EAX (at the return of system call)	
 13802                              <1> 
 13803                              <1> 	;	
 13804                              <1> 	; Note: If byte [FFF_Valid] = 0
 13805                              <1> 	;	'sysfnf' will return with 'no more files' error.
 13806                              <1> 	;	If byte [FFF_Valid] = 24
 13807                              <1> 	;	'sysfnf' will return with 32 bytes basic parameters
 13808                              <1> 	;	at the address which is in EDX.
 13809                              <1> 	;	If byte [FFF_Valid] = 128
 13810                              <1> 	;	'sysfnf' will return with 128 bytes Find File 
 13811                              <1> 	;	Structure/Table at the address which is in EDX.
 13812                              <1> 	
 13813 00011429 803D[448E0100]00    <1> 	cmp	byte [FFF_Valid], 0
 13814 00011430 7714                <1> 	ja	short stsfnf_0
 13815                              <1>  	; 'no more files !' error 
 13816 00011432 B80C000000          <1> 	mov	eax, ERR_NO_MORE_FILES ; 12
 13817 00011437 A3[64030300]        <1> 	mov	[u.r0], eax
 13818 0001143C A3[C8030300]        <1> 	mov	[u.error], eax
 13819 00011441 E986C4FFFF          <1> 	jmp	error
 13820                              <1> stsfnf_0:
 13821                              <1> 	;cmp	byte [FFF_Valid], 128
 13822                              <1> 	;je	short stsfnf_1
 13823                              <1> 	;cmp	byte [FFF_Valid], 24
 13824                              <1> 	;je	short stsfnf_1
 13825                              <1> 	;mov	[FFF_Valid], 24 ; Default
 13826                              <1> stsfnf_1:
 13827 00011446 0FB61D[56820100]    <1> 	movzx	ebx, byte [Current_Drv]
 13828 0001144D 66891D[4A8E0100]    <1> 	mov	[SWP_DRV], bx
 13829 00011454 8A15[F68A0100]      <1> 	mov	dl, [FindFile_Drv]
 13830 0001145A 38DA                <1> 	cmp	dl, bl
 13831 0001145C 750B                <1> 	jne	short stsfnf_2
 13832 0001145E 86FB                <1> 	xchg	bh, bl
 13833 00011460 BE00010900          <1> 	mov	esi, Logical_DOSDisks
 13834 00011465 01DE                <1> 	add	esi, ebx
 13835 00011467 EB0D                <1> 	jmp	short sysfnf_3
 13836                              <1> 
 13837                              <1> stsfnf_2:
 13838 00011469 FE05[4B8E0100]      <1> 	inc	byte [SWP_DRV_chg]
 13839                              <1> 
 13840 0001146F E85A6CFFFF          <1> 	call	change_current_drive
 13841 00011474 7245                <1> 	jc	short sysfnf_err_1 ; read error ! 
 13842                              <1> 				   ; (do not stop, because
 13843                              <1> 				   ; we don't have a
 13844                              <1> 				   ; 'no more files'
 13845                              <1> 				   ; -file not found- error,	
 13846                              <1> 				   ; next sysfnf system call
 13847                              <1> 				   ; may solve the problem,
 13848                              <1> 				   ; after re-placing the disk)				
 13849                              <1> sysfnf_3:
 13850 00011476 A1[6C8B0100]        <1> 	mov	eax, [FindFile_DirCluster]
 13851 0001147B 21C0                <1> 	and	eax, eax
 13852 0001147D 7550                <1> 	jnz	short sysfnf_6
 13853                              <1>         
 13854 0001147F 803D[55820100]02    <1> 	cmp	byte [Current_FATType], 2
 13855 00011486 772C                <1> 	ja	short sysfnf_err_0 ; invalid, we neeed to stop !?
 13856 00011488 803D[55820100]01    <1> 	cmp	byte [Current_FATType], 1
 13857 0001148F 7223                <1> 	jb	short sysfnf_err_0 ; invalid, we neeed to stop !?
 13858                              <1> 
 13859 00011491 3805[7C890100]      <1> 	cmp	byte [DirBuff_ValidData], al ; 0
 13860 00011497 7608                <1> 	jna	short sysfnf_4 
 13861                              <1> 
 13862 00011499 3B05[81890100]      <1> 	cmp	eax, [DirBuff_Cluster] ; 0 ?
 13863 0001149F 745E                <1> 	je	short sysfnf_9
 13864                              <1> 
 13865                              <1> 	;cmp	byte [Current_Dir_Level], 0
 13866                              <1>         ;ja	short sysfnf_4  
 13867                              <1>         ;jna	short sysfnf_9 
 13868                              <1> 
 13869                              <1> sysfnf_4:
 13870 000114A1 FE05[4B8E0100]      <1> 	inc	byte [SWP_DRV_chg]
 13871 000114A7 E805BAFFFF          <1> 	call 	load_FAT_root_directory
 13872 000114AC 7351                <1> 	jnc	short sysfnf_9
 13873                              <1> 	; eax = error code (17, 'drv not ready or read error')
 13874 000114AE EB0B                <1> 	jmp	short sysfnf_err_1 ; read error ! (no FNF stop)
 13875                              <1> 				   ; (if you want, try again, 
 13876                              <1> 				   ;  after re-placing the disk)
 13877                              <1> sysfnf_5:	
 13878 000114B0 3C0C                <1> 	cmp	al, 12 ; 'no more files' error
 13879 000114B2 7507                <1> 	jne	short sysfnf_err_1 ; (no FNF stop -sysfnf will try
 13880                              <1> 				   ;  to read the directory again,
 13881                              <1> 				   ;  if the user calls sysfnf
 13882                              <1> 				   ;  just after this error return-)
 13883                              <1> 	; (FNF stop -sysfnf will not try
 13884                              <1> 	;  to read the directory again-)	
 13885                              <1> 
 13886                              <1> sysfnf_err_0:
 13887 000114B4 C605[448E0100]00    <1> 	mov	byte [FFF_Valid], 0 ; FNF stop sign
 13888                              <1> sysfnf_err_1:
 13889 000114BB A3[64030300]        <1> 	mov	[u.r0], eax
 13890 000114C0 A3[C8030300]        <1> 	mov	[u.error], eax
 13891 000114C5 E84B130000          <1> 	call	reset_working_path
 13892 000114CA E9FDC3FFFF          <1> 	jmp	error
 13893                              <1> 	  
 13894                              <1> sysfnf_6:
 13895 000114CF 803D[7C890100]00    <1> 	cmp	byte [DirBuff_ValidData], 0
 13896 000114D6 7608                <1> 	jna	short sysfnf_7
 13897                              <1> 
 13898 000114D8 3B05[81890100]      <1> 	cmp	eax, [DirBuff_Cluster]
 13899 000114DE 741F                <1> 	je	short sysfnf_9
 13900                              <1> 
 13901                              <1> sysfnf_7:
 13902 000114E0 FE05[4B8E0100]      <1> 	inc	byte [SWP_DRV_chg]
 13903 000114E6 803D[55820100]01    <1> 	cmp	byte [Current_FATType], 1
 13904 000114ED 7309                <1> 	jnb	short sysfnf_8
 13905                              <1> 
 13906                              <1> 	; Singlix (TRFS) File System 
 13907                              <1> 	; (access via compatibility buffer)
 13908 000114EF E885BAFFFF          <1> 	call	load_FS_sub_directory
 13909 000114F4 7309                <1> 	jnc	short sysfnf_9
 13910                              <1> 
 13911 000114F6 EBC3                <1> 	jmp	short sysfnf_err_1 ; read error (no FNF stop)
 13912                              <1> 
 13913                              <1> sysfnf_8:
 13914 000114F8 E83FBAFFFF          <1> 	call	load_FAT_sub_directory	 
 13915 000114FD 72BC                <1> 	jc	short sysfnf_err_1 ; read error (no FNF stop)
 13916                              <1> 
 13917                              <1> sysfnf_9:
 13918 000114FF E81C80FFFF          <1> 	call	find_next_file
 13919 00011504 72AA                <1> 	jc	short sysfnf_5
 13920                              <1> 
 13921 00011506 A0[458E0100]        <1> 	mov	al, [FFF_Attrib]
 13922                              <1> 	;or	al, al
 13923                              <1> 	;jz	short sysfnf_10 ; 0 = No filter
 13924 0001150B 34FF                <1> 	xor	al, 0FFh
 13925 0001150D 20D8                <1> 	and	al, bl
 13926 0001150F 75EE                <1> 	jnz	short sysfnf_9 ; search for next file until
 13927                              <1> 			       ; an error return from
 13928                              <1> 			       ; find_next_file procedure	
 13929                              <1> sysfnf_10:
 13930 00011511 0FB60D[448E0100]    <1>         movzx	ecx, byte [FFF_Valid]
 13931 00011518 80F980              <1> 	cmp	cl, 128 ; complete FindFile structure/table 
 13932 0001151B 0F84A2FEFFFF        <1> 	je	sysfnf_11
 13933                              <1> 	;cmp	cl, 24  ; basic parameters
 13934                              <1> 	;je	sysfnf_12       
 13935 00011521 E9AFFEFFFF          <1> 	jmp	sysfnf_12
 13936                              <1> 
 13937                              <1> writei:
 13938                              <1> 	; 26/10/2016
 13939                              <1> 	; 25/10/2016
 13940                              <1> 	; 23/10/2016
 13941                              <1> 	; 22/10/2016
 13942                              <1> 	; 19/10/2016 - TRDOS 386 (TRDOS v2.0)
 13943                              <1> 	; 19/05/2015 - 20/05/2015 (Retro UNIX 386 v1)
 13944                              <1> 	; 12/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
 13945                              <1> 	;
 13946                              <1> 	; Write data to file with first cluster number in EAX
 13947                              <1> 	; 
 13948                              <1> 	; INPUTS ->
 13949                              <1> 	;    EAX - First cluster number of the file
 13950                              <1> 	;    EBX - File number (Open file index number)
 13951                              <1> 	;    u.count - byte count to be written
 13952                              <1> 	;    u.base - points to user buffer
 13953                              <1> 	;    u.fofp - points to dword with current file offset
 13954                              <1> 	;    i.size - file size
 13955                              <1> 	;    cdev - logical dos drive number of the file
 13956                              <1> 	; OUTPUTS ->
 13957                              <1> 	;    u.count - cleared
 13958                              <1> 	;    u.nread - accumulates total bytes passed back
 13959                              <1> 	;    i.size - new file size (if file byte offset overs file size)
 13960                              <1> 	;    u.fofp - points to u.off (with new offset value)	
 13961                              <1> 	;
 13962                              <1> 	; (Retro UNIX Prototype : 11/11/2012 - 18/11/2012, UNIXCOPY.ASM)
 13963                              <1> 	; ((Modified registers: eax, edx, ebx, ecx, esi, edi, ebp)) 	
 13964                              <1> 
 13965 00011526 31C9                <1> 	xor	ecx, ecx
 13966 00011528 890D[8C030300]      <1> 	mov 	[u.nread], ecx  ; 0
 13967 0001152E 66890D[C4030300]    <1> 	mov	[u.pcount], cx ; 19/05/2015
 13968 00011535 390D[88030300]      <1> 	cmp 	[u.count], ecx
 13969 0001153B 7701                <1> 	ja 	short writei_1 
 13970 0001153D C3                  <1> 	retn
 13971                              <1> writei_1:
 13972 0001153E 881D[048E0100]      <1> 	mov	[writei.ofn], bl ; Open file number
 13973 00011544 880D[3F8E0100]      <1> 	mov	[setfmod], cl ; 0 ; reset 'update lm date&time' sign
 13974                              <1> dskw_0: 
 13975                              <1> 	; 26/10/2016
 13976                              <1> 	; 22/10/2016, 23/10/2016, 25/10/2016
 13977                              <1> 	; 19/10/2016 - TRDOS 386 (TRDOS v2.0)
 13978                              <1> 	; 31/05/2015 - 25/07/2015 (Retro UNIX 386 v1)
 13979                              <1> 	; 26/04/2013 - 20/09/2013 (Retro UNIX 8086 v1)
 13980                              <1> 	;
 13981                              <1> 	; 01/08/2013 (mkdir_w check)
 13982 0001154A E8D7000000          <1>  	call	mget_w
 13983                              <1> 	; eax = sector/block number
 13984                              <1> 
 13985 0001154F 8B1D[74030300]      <1> 	mov     ebx, [u.fofp]
 13986 00011555 8B13                <1> 	mov	edx, [ebx]
 13987 00011557 81E2FF010000        <1> 	and	edx, 1FFh  ; / test the lower 9 bits of the file offset
 13988 0001155D 750C                <1> 	jnz	short dskw_1 ; / if its non-zero, branch
 13989                              <1> 			     ; if zero, file offset = 0,
 13990                              <1> 		       	     ; / 512, 1024,...(i.e., start of new block)
 13991 0001155F 813D[88030300]0002- <1> 	cmp	dword [u.count], 512
 13991 00011567 0000                <1>
 13992                              <1> 				; / if zero, is there enough data to fill
 13993                              <1> 				; / an entire block? (i.e., no. of
 13994 00011569 7337                <1> 	jnb	short dskw_2 ; / bytes to be written greater than 512.? 
 13995                              <1> 			     ; / Yes, branch. Don't have to read block
 13996                              <1> dskw_1: ; in as no past info. is to be saved 
 13997                              <1> 	; (the entire block will be overwritten).
 13998                              <1> 	; 23/10/2016
 13999                              <1> 
 14000 0001156B BB[94070300]        <1> 	mov	ebx, writei_buffer
 14001                              <1> 	; esi = logical dos drive description table address
 14002                              <1> 	; eax = sector number
 14003                              <1> 	; ebx = buffer address (in kernel's memory space)
 14004                              <1> 	; ecx = sector count
 14005 00011570 B901000000          <1> 	mov	ecx, 1
 14006 00011575 E8A30D0000          <1> 	call	disk_read
 14007                              <1> 	;call	dskrd 	; / no, must retain old info.. 
 14008                              <1> 		       	; / Hence, read block 'r1' into an I/O buffer
 14009 0001157A 7326                <1> 	jnc	short dskw_2
 14010                              <1> 
 14011                              <1> 	; disk read error
 14012 0001157C B811000000          <1> 	mov	eax, 17 ; drive not ready or READ ERROR !
 14013                              <1> dskw_err: ; jump from disk write error
 14014 00011581 A3[64030300]        <1> 	mov	[u.r0], eax
 14015 00011586 A3[C8030300]        <1> 	mov	[u.error], eax
 14016                              <1> 
 14017 0001158B 803D[3F8E0100]00    <1> 	cmp	byte [setfmod], 0
 14018 00011592 0F8634C3FFFF        <1> 	jna	error
 14019                              <1> 
 14020 00011598 E8AF030000          <1> 	call	update_file_lmdt ; update last modif. date&time of the file
 14021                              <1> 	;mov	byte [setfmod], 0	
 14022                              <1> 
 14023 0001159D E92AC3FFFF          <1> 	jmp	error
 14024                              <1> 
 14025                              <1> dskw_2: ; 3:
 14026                              <1> 	; 23/10/2016
 14027 000115A2 C605[E08D0100]01    <1> 	mov	byte [writei.valid], 1 ; writei buffer contains valid data
 14028 000115A9 56                  <1> 	push	esi ; logical dos drive description table address
 14029                              <1> 	; EAX (r1) = block/sector number
 14030                              <1> 	;call	wslot
 14031                              <1> 		; jsr r0,wslot / set write and inhibit bits in I/O queue, 
 14032                              <1> 			   ; / proc. status=0, r5 points to 1st word of data
 14033 000115AA 803D[C6030300]00    <1> 	cmp	byte [u.kcall], 0
 14034 000115B1 770F                <1> 	ja	short dskw_4 ; zf=0 -> the caller is 'mkdir'
 14035                              <1> 	;
 14036 000115B3 66833D[C4030300]00  <1> 	cmp	word [u.pcount], 0
 14037 000115BB 7705                <1> 	ja	short dskw_4
 14038                              <1> dskw_3:
 14039                              <1> 	; [u.base] = virtual address to transfer (as source address)
 14040 000115BD E821FAFFFF          <1> 	call	trans_addr_r ; translate virtual address to physical (r)
 14041                              <1> dskw_4:
 14042 000115C2 BB[94070300]        <1> 	mov	ebx, writei_buffer
 14043                              <1> 	; EBX (r5) = system (I/O) buffer address
 14044 000115C7 E883FAFFFF          <1> 	call	sioreg
 14045                              <1> 	; ESI = file (user data) offset
 14046                              <1> 	; EDI = sector (I/O) buffer offset
 14047                              <1> 	; ECX = byte count
 14048                              <1> 	;
 14049 000115CC F3A4                <1>   	rep	movsb
 14050                              <1> 	; 25/07/2015
 14051                              <1> 	; eax = remain bytes in buffer
 14052                              <1>         ;       (check if remain bytes in the buffer > [u.pcount])
 14053 000115CE 09C0                <1> 	or	eax, eax
 14054 000115D0 75EB                <1> 	jnz	short dskw_3 ; (page end before system buffer end!)	
 14055                              <1> 
 14056                              <1> 	; 23/10/2016
 14057 000115D2 B101                <1> 	mov	cl, 1
 14058 000115D4 5E                  <1> 	pop	esi
 14059 000115D5 A1[E48D0100]        <1> 	mov	eax, [writei.sector]
 14060                              <1> 	; esi = logical dos drive description table address
 14061                              <1> 	; eax = sector number
 14062                              <1> 	; ebx = writei buffer address
 14063                              <1> 	; ecx = sector count
 14064 000115DA E82F0D0000          <1> 	call	disk_write ; / yes, write the block
 14065 000115DF 7307                <1> 	jnc	short dskw_5
 14066                              <1> 
 14067 000115E1 B812000000          <1> 	mov	eax, 18 ; drive not ready or WRITE ERROR !
 14068 000115E6 EB99                <1> 	jmp	short dskw_err
 14069                              <1> 
 14070                              <1> dskw_5:
 14071                              <1> 	; 26/10/2016
 14072 000115E8 0FB61D[048E0100]    <1> 	movzx	ebx, byte [writei.ofn] ; open file number
 14073 000115EF C0E302              <1> 	shl	bl, 2 ; *4
 14074 000115F2 8B83[D4910100]      <1> 	mov	eax, [ebx+OF_POINTER]
 14075 000115F8 3B83[FC910100]      <1> 	cmp	eax, [ebx+OF_SIZE]
 14076 000115FE 7606                <1> 	jna	short dskw_6
 14077 00011600 8983[FC910100]      <1> 	mov	[ebx+OF_SIZE], eax
 14078                              <1> dskw_6:
 14079                              <1> 	;shr	bl, 2
 14080 00011606 833D[88030300]00    <1>         cmp     dword [u.count], 0 ; / any more data to write?
 14081 0001160D 760A                <1> 	jna	short dskw_7
 14082 0001160F A1[F48D0100]        <1> 	mov	eax, [writei.fclust]
 14083 00011614 E931FFFFFF          <1> 	jmp	dskw_0 ; / yes, branch
 14084                              <1> dskw_7:
 14085                              <1>  	; update last modif. date&time of the file
 14086                              <1> 	; (also updates file size as OF_SIZE)
 14087 00011619 E82E030000          <1> 	call	update_file_lmdt
 14088                              <1> 	;mov	byte [setfmod], 0	
 14089                              <1> 
 14090                              <1> 	; 03/08/2013
 14091 0001161E C605[C6030300]00    <1> 	mov	byte [u.kcall], 0
 14092                              <1> 	; 23/10/2016
 14093                              <1> 	;mov	eax, [writei.fclust]
 14094 00011625 C3                  <1> 	retn
 14095                              <1> 
 14096                              <1> mget_w:
 14097                              <1> 	; 02/11/2016
 14098                              <1> 	; 01/11/2016
 14099                              <1> 	; 23/10/2016, 31/10/2016
 14100                              <1> 	; 22/10/2016 - TRDOS 386 (TRDOS v2.0)
 14101                              <1> 	; 03/06/2015 (Retro UNIX 386 v1, 'mget', u.5s)
 14102                              <1> 	; 22/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
 14103                              <1> 	;
 14104                              <1> 	; Get existing or (allocate) a new disk block for file
 14105                              <1> 	; 
 14106                              <1> 	; INPUTS ->
 14107                              <1> 	;    [u.fofp] = file offset pointer
 14108                              <1> 	;    [i.size] = file size
 14109                              <1> 	;    [u.count] = byte count	 
 14110                              <1> 	;    EAX = First cluster
 14111                              <1> 	;    [cdev] = Logical dos drive number 	  
 14112                              <1> 	;    [writei.ofn] = File Number
 14113                              <1> 	;		   (Open file index, 0 based)
 14114                              <1> 	;    ([u.off] = file offset)
 14115                              <1> 	; OUTPUTS ->
 14116                              <1> 	;    EAX = logical sector number
 14117                              <1> 	;    ESI = Logical Dos Drive Description Table address
 14118                              <1> 	;
 14119                              <1> 	; Modified registers: EDX, EBX, ECX, ESI, EDI, EBP  
 14120                              <1> 
 14121 00011626 8B35[74030300]      <1>         mov     esi, [u.fofp]
 14122 0001162C 8B2E                <1> 	mov	ebp, [esi] ; u.off (or EBX*4+OF_POINTER)
 14123                              <1> 
 14124 0001162E 29C9                <1> 	sub	ecx, ecx
 14125 00011630 8A2D[46030300]      <1> 	mov	ch, [cdev]
 14126                              <1> 
 14127 00011636 BE00010900          <1> 	mov	esi, Logical_DOSDisks
 14128 0001163B 01CE                <1> 	add	esi, ecx
 14129                              <1> 
 14130                              <1> 	; 31/10/2016
 14131 0001163D 89C3                <1> 	mov	ebx, eax ; First Cluster or FDT address
 14132                              <1> 
 14133 0001163F 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
 14134 00011643 0F86DD010000        <1> 	jna	mget_w_14 ; Singlix FS
 14135                              <1> 
 14136 00011649 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
 14137 0001164D 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
 14138 00011651 8815[E28D0100]      <1> 	mov	[writei.spc], dl  ; sectors per cluster
 14139 00011657 F7E2                <1> 	mul	edx
 14140                              <1> 	; edx = 0
 14141                              <1> 	; eax = bytes per cluster (<= 65536)
 14142                              <1> 
 14143                              <1> 	; 02/11/2016
 14144 00011659 89C1                <1> 	mov	ecx, eax
 14145 0001165B 48                  <1> 	dec	eax
 14146 0001165C 66A3[E88D0100]      <1> 	mov	[writei.bpc], ax	
 14147                              <1> 	
 14148 00011662 89E8                <1> 	mov	eax, ebp
 14149 00011664 0305[88030300]      <1> 	add	eax, [u.count] ; next file position
 14150 0001166A 3B05[55040300]      <1> 	cmp	eax, [i.size] ; <= file size ?
 14151 00011670 0F86FC000000        <1> 	jna	mget_w_4 ; no
 14152                              <1> 
 14153 00011676 F7F1                <1> 	div	ecx
 14154 00011678 A3[F08D0100]        <1> 	mov	[writei.c_index], eax ; cluster index
 14155                              <1> 	; edx = byte offset in cluster (<= 65535)
 14156                              <1> 	;mov	[writei.offset], dx
 14157                              <1> 	;shr	dx, 9 ; / 512
 14158                              <1> 	;mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
 14159                              <1> 
 14160 0001167D 29D2                <1> 	sub	edx, edx ; 01/11/2016
 14161 0001167F 8915[E48D0100]      <1> 	mov 	[writei.sector], edx ; 0
 14162 00011685 668915[EA8D0100]    <1> 	mov	[writei.offset], dx  ; byte offset in cluster 
 14163 0001168C 8815[E38D0100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
 14164                              <1> 
 14165 00011692 89D8                <1> 	mov	eax, ebx ; First Cluster
 14166                              <1> 
 14167                              <1> 	; is this the 1st mget_w or a next mget_w call ? (by 'writei')
 14168 00011694 3815[E08D0100]      <1> 	cmp	byte [writei.valid], dl ; 0 
 14169 0001169A 7624                <1> 	jna	short mget_w_0
 14170                              <1> 
 14171 0001169C 8815[E08D0100]      <1> 	mov 	byte [writei.valid], dl ; 0 ; reset ('writei' will set it) 
 14172                              <1> 
 14173 000116A2 3B05[F48D0100]      <1> 	cmp	eax, [writei.fclust]
 14174 000116A8 7516                <1> 	jne	short mget_w_0
 14175                              <1> 
 14176 000116AA 8A0D[46030300]      <1> 	mov	cl, [cdev]
 14177 000116B0 3A0D[E18D0100]      <1> 	cmp	cl, [writei.drv]
 14178 000116B6 7508                <1> 	jne	short mget_w_0
 14179                              <1>  	; [writei.l_clust] & [writei.l_index] are valid, 
 14180                              <1> 	;  we don't need to get last cluster & last cluster index
 14181 000116B8 8B0D[008E0100]      <1> 	mov	ecx, [writei.l_index]
 14182 000116BE EB64                <1> 	jmp	short mget_w_2
 14183                              <1> mget_w_0:
 14184 000116C0 A3[F48D0100]        <1> 	mov	[writei.fclust], eax ; first cluster
 14185                              <1> 	; edx = 0
 14186 000116C5 A3[EC8D0100]        <1> 	mov	[writei.cluster], eax ; first cluster ; 01/11/2016
 14187 000116CA 8915[F88D0100]      <1> 	mov 	[writei.fs_index], edx ; 0 ; curret cluster index
 14188                              <1> 
 14189                              <1> 	; FAT file system (FAT12, FAT16, FAT32)
 14190 000116D0 E87CBEFFFF          <1> 	call	get_last_cluster
 14191 000116D5 0F822B010000        <1> 	jc	mget_w_err ; eax = error code
 14192                              <1> 		
 14193 000116DB A3[FC8D0100]        <1> 	mov	[writei.lclust], eax ; last cluster
 14194                              <1> 
 14195 000116E0 8B0D[208C0100]      <1> 	mov	ecx, [glc_index] ; last cluster index
 14196 000116E6 890D[008E0100]      <1> 	mov	[writei.l_index], ecx
 14197                              <1> 
 14198 000116EC A0[048E0100]        <1> 	mov	al, [writei.ofn]
 14199 000116F1 FEC0                <1> 	inc	al
 14200 000116F3 A2[3F8E0100]        <1> 	mov	[setfmod], al ; update lm date&time sign
 14201                              <1> 
 14202                              <1> mget_w_1:
 14203 000116F8 3B0D[F08D0100]      <1> 	cmp	ecx, [writei.c_index]  ; last cluster index
 14204 000116FE 7324                <1> 	jnb	short mget_w_2 ; 01/11/2016
 14205                              <1> 
 14206 00011700 A1[FC8D0100]        <1> 	mov	eax, [writei.lclust]
 14207                              <1> 	; EAX = Last cluster
 14208 00011705 E855BFFFFF          <1> 	call	add_new_cluster
 14209 0001170A 0F82F6000000        <1> 	jc	mget_w_err ; eax = error code
 14210                              <1> 	; edx = 0
 14211 00011710 A3[FC8D0100]        <1> 	mov	[writei.lclust], eax ; (new) last cluster
 14212 00011715 8B0D[008E0100]      <1> 	mov	ecx, [writei.l_index]
 14213 0001171B 41                  <1> 	inc	ecx ; add 1 to last cluster index
 14214 0001171C 890D[008E0100]      <1> 	mov	[writei.l_index], ecx ; current last cluster index
 14215                              <1> 
 14216 00011722 EBD4                <1> 	jmp	short mget_w_1
 14217                              <1> 
 14218                              <1> mget_w_2:
 14219 00011724 89E9                <1> 	mov	ecx, ebp
 14220 00011726 030D[88030300]      <1> 	add	ecx, [u.count]
 14221 0001172C 890D[55040300]      <1> 	mov	[i.size], ecx ; save new file size
 14222                              <1> 	;sub	edx, edx ; 0
 14223                              <1> 
 14224 00011732 A0[46030300]        <1> 	mov	al, [cdev]
 14225 00011737 A2[E18D0100]        <1> 	mov	[writei.drv], al ; physical drive number
 14226                              <1> 	; edx = 0
 14227 0001173C 89E8                <1> 	mov	eax, ebp ; file offset
 14228 0001173E 0FB70D[E88D0100]    <1> 	movzx	ecx, word [writei.bpc] ; bytes per cluster - 1
 14229 00011745 41                  <1> 	inc	ecx ; bytes per cluster
 14230 00011746 F7F1                <1> 	div	ecx
 14231                              <1> 	; edx = byte offset in cluster (<= 65535)
 14232                              <1> 	; eax = cluster index
 14233 00011748 A3[F08D0100]        <1> 	mov	[writei.c_index], eax
 14234 0001174D 668915[EA8D0100]    <1> 	mov	[writei.offset], dx
 14235 00011754 66C1EA09            <1> 	shr	dx, 9 ; / 512
 14236 00011758 8815[E38D0100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
 14237                              <1> 
 14238                              <1> mget_w_3:
 14239 0001175E 3B05[008E0100]      <1> 	cmp	eax, [writei.l_index] ; last cluster index
 14240 00011764 752A                <1> 	jne	short mget_w_5
 14241                              <1> 
 14242 00011766 A3[F88D0100]        <1> 	mov	[writei.fs_index], eax ; cluster index (for next check)
 14243 0001176B A1[FC8D0100]        <1> 	mov	eax, [writei.lclust] ; last cluster
 14244 00011770 EB60                <1> 	jmp	short mget_w_10
 14245                              <1> 
 14246                              <1> mget_w_4: ; 02/11/2016
 14247                              <1> 	; eax = next file position
 14248 00011772 2B05[88030300]      <1> 	sub	eax, [u.count] ; current file position
 14249                              <1> 	; edx = 0
 14250                              <1> 	; ecx = bytes per cluster
 14251 00011778 F7F1                <1> 	div	ecx
 14252 0001177A A3[F08D0100]        <1> 	mov	[writei.c_index], eax ; cluster index
 14253 0001177F 668915[EA8D0100]    <1> 	mov	[writei.offset], dx
 14254 00011786 66C1EA09            <1> 	shr	dx, 9 ; / 512
 14255 0001178A 8815[E38D0100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
 14256                              <1> 
 14257                              <1> mget_w_5:
 14258 00011790 21C0                <1> 	and	eax, eax ; 0 = First Cluster's index number
 14259 00011792 750C                <1> 	jnz	short mget_w_6
 14260                              <1> 
 14261 00011794 A3[F88D0100]        <1> 	mov	[writei.fs_index], eax ; cluster index (for next check)
 14262 00011799 A1[F48D0100]        <1> 	mov	eax, [writei.fclust] ; first cluster
 14263 0001179E EB32                <1> 	jmp	short mget_w_10
 14264                              <1> 
 14265                              <1> mget_w_6:
 14266 000117A0 3B05[F88D0100]      <1> 	cmp	eax, [writei.fs_index] ; current cluster index (>0)
 14267 000117A6 7507                <1> 	jne	short mget_w_7
 14268 000117A8 A1[EC8D0100]        <1> 	mov	eax, [writei.cluster] ; current cluster 
 14269 000117AD EB3A                <1> 	jmp	short mget_w_11
 14270                              <1> 
 14271                              <1> mget_w_7:
 14272 000117AF 89C1                <1> 	mov	ecx, eax
 14273 000117B1 2B0D[F88D0100]      <1> 	sub	ecx, [writei.fs_index]
 14274 000117B7 730D                <1> 	jnc	short mget_w_8
 14275                              <1> 	; get cluster by index from the first cluster
 14276 000117B9 A1[F48D0100]        <1> 	mov	eax, [writei.fclust]
 14277 000117BE 8B0D[F08D0100]      <1> 	mov	ecx, [writei.c_index]
 14278 000117C4 EB05                <1> 	jmp	short mget_w_9
 14279                              <1> 
 14280                              <1> mget_w_8:
 14281 000117C6 A1[EC8D0100]        <1> 	mov	eax, [writei.cluster] ; beginning cluster
 14282                              <1> 	; ecx = cluster sequence number after the beginning cluster
 14283                              <1> 	; sub	edx, edx ; 0
 14284                              <1> 
 14285                              <1> mget_w_9:
 14286                              <1> 	; EAX = Beginning cluster
 14287                              <1> 	; EDX = Sector index in disk/file section
 14288                              <1> 	;	(Only for SINGLIX file system!)
 14289                              <1> 	; ECX = Cluster sequence number after the beginning cluster
 14290                              <1> 	; ESI = Logical DOS Drive Description Table address
 14291 000117CB E895BFFFFF          <1> 	call	get_cluster_by_index
 14292 000117D0 7234                <1> 	jc	short mget_w_err ; error code in EAX
 14293                              <1> 	; EAX = Cluster number		
 14294                              <1> mget_w_10:
 14295 000117D2 A3[EC8D0100]        <1> 	mov	[writei.cluster], eax ; FDT number for Singlix File System
 14296                              <1> 
 14297 000117D7 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
 14298 000117DB 7638                <1> 	jna	short mget_w_13
 14299                              <1> 	; 01/11/2016
 14300 000117DD 8B15[F08D0100]      <1> 	mov	edx, [writei.c_index]
 14301 000117E3 8915[F88D0100]      <1> 	mov	[writei.fs_index], edx
 14302                              <1> mget_w_11:
 14303 000117E9 83E802              <1> 	sub	eax, 2
 14304 000117EC 0FB615[E28D0100]    <1> 	movzx	edx, byte [writei.spc]
 14305 000117F3 F7E2                <1> 	mul	edx
 14306                              <1> 
 14307 000117F5 034668              <1> 	add	eax, [esi+LD_DATABegin]
 14308 000117F8 8A15[E38D0100]      <1> 	mov	dl, [writei.s_index]
 14309 000117FE 01D0                <1> 	add	eax, edx
 14310                              <1> mget_w_12:
 14311 00011800 A3[E48D0100]        <1> 	mov	[writei.sector], eax
 14312                              <1> 	;; buffer validation must be done in writei
 14313                              <1> 	;;mov	byte [writei.valid], 1 
 14314 00011805 C3                  <1> 	retn
 14315                              <1> 
 14316                              <1> mget_w_err:
 14317 00011806 A3[C8030300]        <1> 	mov	[u.error], eax
 14318 0001180B A3[64030300]        <1> 	mov	[u.r0], eax
 14319 00011810 E9B7C0FFFF          <1> 	jmp	error
 14320                              <1> 
 14321                              <1> mget_w_13:
 14322                              <1> 	; EAX = FDT number (Current Section)
 14323                              <1> 	; EDX = Sector index from the first section (0,1,2,3,4...)
 14324 00011815 2B15[F88D0100]      <1> 	sub	edx, [writei.fs_index]	
 14325                              <1> 	; EDX = Sector index from current section
 14326 0001181B 8915[F88D0100]      <1> 	mov	[writei.fs_index], edx
 14327 00011821 40                  <1> 	inc	eax ; the first data sector in FS disk section	
 14328 00011822 01D0                <1> 	add	eax, edx
 14329 00011824 EBDA                <1> 	jmp	short mget_w_12
 14330                              <1> 
 14331                              <1> mget_w_14:
 14332 00011826 8A4E12              <1> 	mov	cl, [esi+LD_FS_BytesPerSec+1]
 14333 00011829 D0E9                <1> 	shr	cl, 1 ;  ; 1 for 512 bytes, 4 for 2048 bytes
 14334 0001182B 880D[E28D0100]      <1> 	mov	[writei.spc], cl  ; sectors per cluster
 14335                              <1> 	; NOTE: writei bytes per sector value is always 512 ! 
 14336 00011831 66C705[E88D0100]00- <1> 	mov	word [writei.bpc], 512
 14336 00011839 02                  <1>
 14337                              <1> 
 14338 0001183A 89E9                <1> 	mov	ecx, ebp
 14339 0001183C 030D[88030300]      <1> 	add	ecx, [u.count] ; next file position
 14340 00011842 3B0D[55040300]      <1> 	cmp	ecx, [i.size] ; <= file size ?
 14341 00011848 0F86C8000000        <1> 	jna	mget_w_19 ; no
 14342                              <1> 
 14343 0001184E 29D2                <1> 	sub	edx, edx ; 0
 14344 00011850 8915[E48D0100]      <1> 	mov 	[writei.sector], edx ; 0
 14345 00011856 668915[EA8D0100]    <1> 	mov	[writei.offset], dx  ; byte offset in cluster 
 14346 0001185D 8815[E38D0100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
 14347                              <1> 
 14348 00011863 C1E909              <1> 	shr	ecx, 9 ; 1 cluster = 512 bytes
 14349 00011866 890D[F08D0100]      <1> 	mov	[writei.c_index], ecx ; section/cluster index
 14350                              <1> 	
 14351 0001186C 89D8                <1> 	mov	eax, ebx ; FDT number (First FDT address)
 14352                              <1> 
 14353                              <1> 	; is this the 1st mget_w or a next mget_w call ? (by 'writei')
 14354 0001186E 3815[E08D0100]      <1> 	cmp	byte [writei.valid], dl ; 0 
 14355 00011874 7624                <1> 	jna	short mget_w_15
 14356                              <1> 
 14357 00011876 8815[E08D0100]      <1> 	mov 	byte [writei.valid], dl ; 0 ; reset ('writei' will set it) 
 14358                              <1> 
 14359 0001187C 3B05[F48D0100]      <1> 	cmp	eax, [writei.fclust]
 14360 00011882 7516                <1> 	jne	short mget_w_15
 14361                              <1> 
 14362 00011884 8A0D[46030300]      <1> 	mov	cl, [cdev]
 14363 0001188A 3A0D[E18D0100]      <1> 	cmp	cl, [writei.drv]
 14364 00011890 7508                <1> 	jne	short mget_w_15
 14365                              <1>  	; [writei.l_clust] & [writei.l_index] are valid, 
 14366                              <1> 	;  we don't need to get last cluster & last cluster index
 14367 00011892 8B0D[008E0100]      <1> 	mov	ecx, [writei.l_index]
 14368 00011898 EB49                <1> 	jmp	short mget_w_17
 14369                              <1> mget_w_15:
 14370 0001189A A3[F48D0100]        <1> 	mov	[writei.fclust], eax ; first section (FDT number)
 14371                              <1> 	; edx = 0
 14372 0001189F 8915[EC8D0100]      <1> 	mov	[writei.cluster], edx ; 0 ; current section
 14373 000118A5 8915[F88D0100]      <1> 	mov 	[writei.fs_index], edx ; 0 ; curret section index
 14374                              <1> 
 14375                              <1> 	; eax = FDT number (section 0 header address)
 14376 000118AB E8DFBEFFFF          <1> 	call	get_last_section
 14377 000118B0 0F8250FFFFFF        <1> 	jc	mget_w_err ; eax = error code
 14378                              <1> 
 14379 000118B6 8915[F88D0100]      <1> 	mov 	[writei.fs_index], edx ; sector index in last section
 14380                              <1> 		
 14381 000118BC A3[FC8D0100]        <1> 	mov	[writei.lclust], eax ; last section address
 14382                              <1> 
 14383 000118C1 8B0D[208C0100]      <1> 	mov	ecx, [glc_index] ; last section index
 14384 000118C7 890D[008E0100]      <1> 	mov	[writei.l_index], ecx
 14385                              <1> 
 14386 000118CD A0[048E0100]        <1> 	mov	al, [writei.ofn]
 14387 000118D2 FEC0                <1> 	inc	al
 14388 000118D4 A2[3F8E0100]        <1> 	mov	[setfmod], al ; update lm date&time sign
 14389                              <1> 
 14390                              <1> mget_w_16:
 14391                              <1> 	; edx = (existing) last section (sector) index
 14392 000118D9 8B0D[F08D0100]      <1> 	mov	ecx, [writei.c_index] ; final section (sector) index
 14393 000118DF 29D1                <1> 	sub	ecx, edx
 14394 000118E1 7633                <1> 	jna	short mget_w_19
 14395                              <1> 	 ; ecx = sector count
 14396                              <1> mget_w_17:
 14397 000118E3 A1[FC8D0100]        <1> 	mov	eax, [writei.lclust]
 14398                              <1> 	; ESI = Logical dos drv desc. table address
 14399                              <1>         ; EAX = Last section
 14400                              <1>         ; (ECX = 0 for directory) 
 14401                              <1>         ; ECX = sector count (except FDT)
 14402 000118E8 E865B4FFFF          <1> 	call	add_new_fs_section
 14403 000118ED 7312                <1> 	jnc	short mget_w_18
 14404                              <1> 
 14405                              <1> 	; If error number = 27h (insufficient disk space)
 14406                              <1> 	; it is needed to check free consequent sectors
 14407                              <1> 	; (1 data sector at least and +1 section header sector) 
 14408                              <1> 
 14409 000118EF 83F827              <1> 	cmp	eax, 27h
 14410 000118F2 0F850EFFFFFF        <1> 	jne	mget_w_err ; eax = error code
 14411                              <1> 
 14412                              <1> 	; ecx = count of free consequent sectors
 14413                              <1> 	; ecx must be > 1 (1 data + 1 header sector)
 14414 000118F8 49                  <1> 	dec	ecx
 14415 000118F9 0F8407FFFFFF        <1> 	jz	mget_w_err
 14416 000118FF EBE2                <1> 	jmp	short mget_w_17
 14417                              <1> 
 14418                              <1> mget_w_18:
 14419 00011901 A3[FC8D0100]        <1> 	mov	[writei.lclust], eax ; (new) last section
 14420                              <1> 	; ecx = sector count (except section header)
 14421 00011906 8B15[008E0100]      <1> 	mov	edx, [writei.l_index]
 14422 0001190C 01CA                <1> 	add	edx, ecx ; add sector count to index
 14423 0001190E 8915[008E0100]      <1> 	mov	[writei.l_index], edx
 14424 00011914 EBC3                <1> 	jmp	short mget_w_16
 14425                              <1> 
 14426                              <1> mget_w_19:
 14427 00011916 89E9                <1> 	mov	ecx, ebp
 14428 00011918 030D[88030300]      <1> 	add	ecx, [u.count]
 14429 0001191E 890D[55040300]      <1> 	mov	[i.size], ecx ; save new file size
 14430                              <1> 	;sub	edx, edx ; 0
 14431                              <1> 
 14432 00011924 A0[46030300]        <1> 	mov	al, [cdev]
 14433 00011929 A2[E18D0100]        <1> 	mov	[writei.drv], al ; physical drive number
 14434                              <1> 	; edx = 0
 14435 0001192E 89E8                <1> 	mov	eax, ebp ; file offset
 14436 00011930 89C2                <1> 	mov	edx, eax
 14437                              <1> 	; 1 cluster = 512 bytes (for Singlix FS)
 14438 00011932 C1E809              <1> 	shr	eax, 9  ; / 512
 14439 00011935 81E2FF010000        <1> 	and	edx, 1FFh
 14440                              <1> 	; edx = byte offset in cluster/sector (<= 511)
 14441                              <1> 	; eax = section (sector/cluster) index
 14442 0001193B A3[F08D0100]        <1> 	mov	[writei.c_index], eax
 14443 00011940 668915[EA8D0100]    <1> 	mov	[writei.offset], dx
 14444                              <1> 	;mov	byte [writei.s_index], 0 ; sector index in cluster
 14445 00011947 E912FEFFFF          <1> 	jmp	mget_w_3
 14446                              <1> 
 14447                              <1> update_file_lmdt: ; & update file size
 14448                              <1> 	; 26/10/2016
 14449                              <1> 	; 24/10/2016
 14450                              <1> 	; 23/10/2016
 14451                              <1> 	; 22/10/2016 - TRDOS 386 (TRDOS v2.0)
 14452                              <1> 	;
 14453                              <1> 	; Update last modification date&time of file
 14454                              <1> 	; (call from syswrite -> writei)
 14455                              <1> 	; ((also updates file size)) // 26/10/2016
 14456                              <1> 	; 
 14457                              <1> 	; INPUT:
 14458                              <1> 	;      byte [setfmod] = open file number
 14459                              <1> 	; OUTPUT:
 14460                              <1> 	;      cf = 0 -> success !
 14461                              <1> 	;      cf = 1 -> lmdt update has been failed! 	 
 14462                              <1> 	;
 14463                              <1> 	; Modified registers: eax, ebx, ecx, edx, esi, edi       				
 14464                              <1> 	;
 14465                              <1> 
 14466                              <1> 	;cmp	byte [setfmod], 0
 14467                              <1> 	;jna	short uflmdt_2 ; nothing to do
 14468                              <1> 
 14469 0001194C 31C0                <1> 	xor	eax, eax
 14470                              <1> 
 14471 0001194E 0FB61D[3F8E0100]    <1> 	movzx	ebx, byte [setfmod]
 14472 00011955 FECB                <1> 	dec	bl ; open file index number (0 based)
 14473                              <1> 
 14474 00011957 8AA3[AC910100]      <1> 	mov	ah, [ebx+OF_DRIVE]
 14475 0001195D BE00010900          <1> 	mov	esi, Logical_DOSDisks
 14476 00011962 01C6                <1> 	add	esi, eax
 14477 00011964 C0E302              <1> 	shl	bl, 2 ; *4	
 14478 00011967 8B8B[84910100]      <1> 	mov	ecx, [ebx+OF_FCLUSTER] ; first cluster
 14479 0001196D 8B93[4C920100]      <1> 	mov	edx, [ebx+OF_DIRCLUSTER] ; dir cluster
 14480                              <1> 
 14481 00011973 D0EB                <1> 	shr	bl, 1 ; /2
 14482 00011975 0FB7BB[EC920100]    <1> 	movzx	edi, word [ebx+OF_DIRENTRY]
 14483                              <1> 	
 14484 0001197C 803D[7C890100]01    <1> 	cmp	byte [DirBuff_ValidData], 1
 14485 00011983 726E                <1> 	jb	short uflmdt_4
 14486                              <1> 
 14487 00011985 A0[7A890100]        <1> 	mov	al, [DirBuff_DRV]
 14488 0001198A 2C41                <1> 	sub	al, 'A'	
 14489 0001198C 38E0                <1> 	cmp	al, ah
 14490 0001198E 7563                <1> 	jne	short uflmdt_4 ; different drive
 14491 00011990 8A4603              <1> 	mov	al, [esi+LD_FATType] 
 14492 00011993 3A05[7B890100]      <1> 	cmp	al, [DirBuff_FATType]
 14493 00011999 755B                <1> 	jne	short uflmdt_5 ; different FS type
 14494 0001199B 3B15[81890100]      <1> 	cmp	edx, [DirBuff_Cluster]
 14495 000119A1 7553                <1> 	jne	short uflmdt_5 ; different cluster
 14496                              <1> 
 14497                              <1> uflmdt_1:
 14498                              <1> 	; Directory buffer is ready here!
 14499                              <1> 	; OF_FCLUSTER must be compared/verified
 14500 000119A3 BE00000800          <1> 	mov	esi, Directory_Buffer
 14501 000119A8 66C1E705            <1> 	shl	di, 5 ; dir entry index * 32
 14502 000119AC 01FE                <1> 	add	esi, edi ; offset
 14503                              <1> 	;
 14504 000119AE F6460B18            <1> 	test	byte [esi+DirEntry_Attr], 18h ; Vol & Dir
 14505 000119B2 750F                <1> 	jnz	short uflmdt_2 ; not a valid file !
 14506 000119B4 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI]
 14507 000119B8 C1E010              <1> 	shl	eax, 16
 14508 000119BB 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO]
 14509 000119BF 39C8                <1> 	cmp	eax, ecx ; same first cluster ?
 14510 000119C1 7407                <1> 	je	short uflmdt_3 ; yes, it is OK !!!	
 14511                              <1> 
 14512                              <1> uflmdt_2:	
 14513                              <1> 	; save directory buffer if has modified/changed sign
 14514                              <1> 	; (It is good to save dir buff even if the searched
 14515                              <1> 	; directory entry is not found !?)
 14516 000119C3 E8DEA0FFFF          <1> 	call	save_directory_buffer
 14517 000119C8 F9                  <1> 	stc	; update failed
 14518 000119C9 C3                  <1> 	retn
 14519                              <1> 	
 14520                              <1> uflmdt_3:
 14521                              <1> 	; Update directory entry
 14522                              <1> 	; 26/10/2016
 14523 000119CA D0E3                <1> 	shl	bl, 1 ; *2 
 14524 000119CC 8B83[FC910100]      <1> 	mov	eax, [ebx+OF_SIZE] ; file size
 14525 000119D2 89461C              <1> 	mov	[esi+DirEntry_FileSize], eax
 14526                              <1> 	;
 14527 000119D5 E82EA0FFFF          <1> 	call	convert_current_date_time
 14528                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
 14529                              <1>         ; 	    AX = Time in dos dir entry format	
 14530 000119DA 66894616            <1> 	mov	[esi+DirEntry_WrtTime], ax
 14531 000119DE 66895618            <1> 	mov	[esi+DirEntry_WrtDate], dx	
 14532 000119E2 66895612            <1> 	mov	[esi+DirEntry_LastAccDate], dx
 14533 000119E6 C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2
 14534 000119ED E8B4A0FFFF          <1> 	call	save_directory_buffer
 14535 000119F2 C3                  <1> 	retn
 14536                              <1> 
 14537                              <1> uflmdt_4:
 14538                              <1> 	; Directory buffer sector read&write
 14539                              <1> 	; 23/10/2016
 14540                              <1> 	;
 14541 000119F3 8A4603              <1> 	mov	al, [esi+LD_FATType]
 14542                              <1> uflmdt_5:
 14543 000119F6 BB[9C090300]        <1> 	mov	ebx, rw_buffer ; Common r/w sector buffer addr
 14544                              <1> 		
 14545 000119FB 20C0                <1> 	and	al, al ; 0 = Singlix FS
 14546 000119FD 0F8492000000        <1> 	jz	uflmdt_11
 14547                              <1> 
 14548 00011A03 21D2                <1> 	and	edx, edx
 14549 00011A05 7521                <1> 	jnz	short uflmdt_9
 14550                              <1> 
 14551 00011A07 3C02                <1> 	cmp	al, 2  ; 3 = FAT32
 14552 00011A09 771A                <1> 	ja	short uflmdt_8
 14553                              <1> 
 14554 00011A0B 89F8                <1> 	mov	eax, edi ; directory entry index number
 14555 00011A0D 66C1E804            <1> 	shr	ax, 4 ; 16 entries per sector	 
 14556 00011A11 034664              <1> 	add	eax, [esi+LD_ROOTBegin]
 14557                              <1> 	; eax = root directory sector
 14558                              <1> uflmdt_6:
 14559 00011A14 50                  <1> 	push	eax ; * ; disk sector address
 14560 00011A15 51                  <1> 	push	ecx ; first cluster	
 14561 00011A16 B901000000          <1> 	mov	ecx, 1
 14562                              <1> 	; ecx = sector count
 14563 00011A1B E8FD080000          <1> 	call	disk_read
 14564 00011A20 59                  <1> 	pop	ecx
 14565 00011A21 731A                <1> 	jnc	short uflmdt_10
 14566 00011A23 58                  <1> 	pop	eax ; *
 14567                              <1> uflmdt_7:
 14568 00011A24 C3                  <1> 	retn	
 14569                              <1> 
 14570                              <1> uflmdt_8:
 14571 00011A25 8B5632              <1> 	mov	edx, [esi+LD_BPB+FAT32_RootFClust]
 14572                              <1> uflmdt_9:
 14573 00011A28 83FA02              <1> 	cmp	edx, 2
 14574 00011A2B 72F7                <1> 	jb	short uflmdt_7 ; invalid, nothing to do
 14575                              <1> 
 14576 00011A2D 83EA02              <1> 	sub	edx, 2
 14577 00011A30 89D0                <1> 	mov	eax, edx
 14578 00011A32 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
 14579 00011A36 F7E2                <1> 	mul	edx
 14580 00011A38 034668              <1> 	add	eax, [esi+LD_DATABegin]
 14581                              <1> 	; eax = sub directory (data) sector 
 14582 00011A3B EBD7                <1> 	jmp	short uflmdt_6
 14583                              <1> 
 14584                              <1> uflmdt_10:
 14585                              <1> 	; Directory sector buffer is ready here!
 14586                              <1> 	; OF_FCLUSTER must be compared/verified
 14587                              <1> 	; edi = dir entry index number (<= 2047)
 14588 00011A3D 6683E70F            <1> 	and	di, 0Fh ; 16 entries per sector
 14589 00011A41 66C1E705            <1> 	shl	di, 5 ; dir entry index * 32
 14590 00011A45 81C7[9C090300]      <1> 	add	edi, rw_buffer
 14591                              <1> 	;
 14592 00011A4B F6470B18            <1> 	test	byte [edi+DirEntry_Attr], 18h ; Vol & Dir
 14593 00011A4F 0F856EFFFFFF        <1> 	jnz	uflmdt_2 ; not a valid file !
 14594 00011A55 668B5714            <1> 	mov	dx, [edi+DirEntry_FstClusHI]
 14595 00011A59 C1E210              <1> 	shl	edx, 16
 14596 00011A5C 668B571A            <1> 	mov	dx, [edi+DirEntry_FstClusLO]
 14597 00011A60 39CA                <1> 	cmp	edx, ecx ; same first cluster ?
 14598 00011A62 0F855BFFFFFF        <1> 	jne	uflmdt_2 ; no !?
 14599                              <1> 
 14600                              <1> 	; Update directory entry
 14601 00011A68 E89B9FFFFF          <1> 	call	convert_current_date_time
 14602                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
 14603                              <1>         ; 	    AX = Time in dos dir entry format	
 14604 00011A6D 66894716            <1> 	mov	[edi+DirEntry_WrtTime], ax
 14605 00011A71 66895718            <1> 	mov	[edi+DirEntry_WrtDate], dx	
 14606 00011A75 66895712            <1> 	mov	[edi+DirEntry_LastAccDate], dx
 14607                              <1> 	
 14608 00011A79 58                  <1> 	pop	eax ; *
 14609                              <1> 
 14610 00011A7A BB[9C090300]        <1> 	mov	ebx, rw_buffer ; Common r/w sector buffer addr
 14611 00011A7F B901000000          <1> 	mov	ecx, 1
 14612                              <1> 	; esi = logical dos description table address
 14613                              <1> 	; eax = disk sector number/address (LBA)
 14614                              <1> 	; ecx = sector count
 14615                              <1> 	; ebx = buffer address
 14616 00011A84 E885080000          <1> 	call	disk_write
 14617 00011A89 0F8234FFFFFF        <1> 	jc	uflmdt_2
 14618                              <1> 	
 14619                              <1> 	; save directory buffer if has modified/changed sign
 14620 00011A8F E812A0FFFF          <1> 	call	save_directory_buffer
 14621 00011A94 C3                  <1> 	retn
 14622                              <1> 
 14623                              <1> uflmdt_11:
 14624                              <1> 	; 24/10/2016
 14625                              <1> 	; Update last modification date & time of a file
 14626                              <1> 	; on a disk with Singlix File System.
 14627                              <1> 	;
 14628                              <1> 	; (Method: Read the FDT -File Description Table-
 14629                              <1> 	; sector of the file and update the lmdt data fields,
 14630                              <1> 	; then write FDT sector to the disk.
 14631                              <1> 	; /// It is easy but there is compatibility buffer
 14632                              <1> 	; method also for changing directory entry data and
 14633                              <1> 	; also there are some programming issues for Singlix
 14634                              <1> 	; file system (TRFS), which are not completed yet!)
 14635                              <1> 	;
 14636                              <1> 	; Not ready yet ! (24/10/2016)
 14637                              <1> 	; /// Temporary code for error return ! ///
 14638 00011A95 31C0                <1> 	xor	eax, eax
 14639 00011A97 F9                  <1> 	stc
 14640 00011A98 C3                  <1> 	retn
 14641                              <1> 
 14642                              <1> sysalloc:
 14643                              <1> 	; 14/10/2017
 14644                              <1> 	; 20/08/2017, 01/09/2017
 14645                              <1> 	; 20/02/2017, 04/03/2017, 15/05/2017
 14646                              <1> 	; 19/02/2017 - TRDOS 386 (TRDOS v2.0)
 14647                              <1> 	; (TRDOS 386 feature only!)
 14648                              <1> 	;
 14649                              <1> 	; Allocate Contiguous Memory Block/Pages (for user)
 14650                              <1> 	; (System call for DMA Buffer allocation etc.)	
 14651                              <1> 	;
 14652                              <1> 	; INPUT ->
 14653                              <1> 	;	EBX = Virtual address (for user)
 14654                              <1> 	;	     (Physical memory block/aperture
 14655                              <1> 	;	     will be mapped to this virtual address) 
 14656                              <1> 	;	ECX = Byte Count
 14657                              <1> 	;	     (will be rounded up to page border)
 14658                              <1> 	;	If ECX = 0
 14659                              <1> 	;	    System call will return with an error (cf=1)
 14660                              <1> 	;	    but ECX will contain maximum size of
 14661                              <1> 	;	    available memory aperture and physical
 14662                              <1> 	;	    (beginning) address of that aperture
 14663                              <1> 	;	    (which have maximum size) will be in EAX.
 14664                              <1> 	;	EDX = Upper limit of the requested physical memory
 14665                              <1> 	;	      block/pages.
 14666                              <1> 	;	     (The last byte address of the memory aperture 
 14667                              <1> 	;	      must not be equal to or above this limit.)	
 14668                              <1> 	;	If EDX = 0
 14669                              <1> 	; 	   there is NOLIMIT !
 14670                              <1> 	;	If EDX = 0FFFFFFFFh (-1) 
 14671                              <1> 	;	   ESI = Lower Limit !
 14672                              <1> 	;		(Beginning of the block must not be 'less'
 14673                              <1> 	;		than this.) (Must be equal to or above...)
 14674                              <1> 	;	   EDI = Upper Limit !
 14675                              <1> 	;		(End of the block must be !less! than this)
 14676                              <1> 	;		(The last byte addr of the memory aperture 
 14677                              <1> 	;		must not be equal to or above this limit.)
 14678                              <1> 	;
 14679                              <1> 	; OUTPUT ->
 14680                              <1> 	;	If CF = 0
 14681                              <1> 	;	EAX = Physical address of the allocated memory block
 14682                              <1> 	;	ECX = Allocated bytes (as rounded up to page borders)
 14683                              <1> 	;	EBX = Virtual address (as rounded up)
 14684                              <1> 	;	IF CF = 1
 14685                              <1> 	;	    Requested (size of) Memory block could not be 
 14686                              <1> 	;	    allocated to the user!	
 14687                              <1> 	;	IF CF = 1 & EAX = 0 (Insufficient memory error!)
 14688                              <1> 	;	   ECX = Total number of free bytes
 14689                              <1> 	;	         (not size of available contiguous bytes!)		 	
 14690                              <1> 	;	If CF = 1 & EAX > 0
 14691                              <1> 	;	   there is not a memory aperture with requested size
 14692                              <1> 	;	   but total free mem is not less than requested size.
 14693                              <1> 	;	   EAX = Physical addr of available memory aperture
 14694                              <1> 	;	   	 with max size 
 14695                              <1> 	;	        (but it doesn't fit to the conditions!) 	
 14696                              <1> 	;	   ECX = Size of available memory aperture in bytes.
 14697                              <1> 	;	If CF = 1 -> EAX = 0FFFFFFFFh	
 14698                              <1> 	;	   Conditions/Parameters are wrong !		 		
 14699                              <1> 	;	   ECX is same with input value.
 14700                              <1> 	;
 14701                              <1> 	; Note:	Previously allocated pages will be deallocated if
 14702                              <1> 	;       new allocation conditions are met.
 14703                              <1> 	;
 14704                              <1> 	; Note: u.break control may be included in future versions	
 14705                              <1> 	;
 14706                              <1> 
 14707 00011A99 31C0                <1> 	xor	eax, eax ; 0
 14708                              <1> 	; 14/10/2017
 14709 00011A9B 4A                  <1> 	dec	edx ; is there a limit ?
 14710 00011A9C 7810                <1> 	js	short sysalloc_1 ;  0 -> 0FFFFFFFFh -> NO LIMIT
 14711 00011A9E 42                  <1> 	inc	edx ; > 0
 14712                              <1> 	; Check upper address limit
 14713                              <1> 	;(round up to page borders)
 14714 00011A9F 81C1FF0F0000        <1> 	add	ecx, PAGE_SIZE-1 ; 4095
 14715 00011AA5 6681E100F0          <1> 	and	cx, ~PAGE_OFF ; not 4095
 14716 00011AAA 39CA                <1> 	cmp	edx, ecx ; upper limit - block size
 14717 00011AAC 7224                <1> 	jb	short sysalloc_err
 14718                              <1> sysalloc_1:
 14719                              <1> 	; EAX = Beginning address (physical)
 14720                              <1> 	; EAX = 0 -> Allocate mem block from the 1st proper aperture	
 14721                              <1> 	; ECX = Number of bytes to be allocated		
 14722 00011AAE E8C049FFFF          <1> 	call	allocate_memory_block
 14723 00011AB3 721D                <1> 	jc	short sysalloc_err
 14724                              <1> 	; 01/09/2017
 14725 00011AB5 29C2                <1> 	sub	edx, eax ; upper limit address - beginning address
 14726 00011AB7 760F                <1> 	jna	short sysalloc_3 ; begin addr not less than the limit
 14727 00011AB9 39CA                <1> 	cmp	edx, ecx
 14728 00011ABB 720B                <1> 	jb	short sysalloc_3 ; end address overs the limit
 14729                              <1> sysalloc_2:	
 14730                              <1> 	; EAX = Beginning (physical) addr of the allocated mem block
 14731                              <1> 	; ECX = Num of allocated bytes (rounded up to page borders) 
 14732 00011ABD 50                  <1> 	push	eax ; * ; 04/03/2017	
 14733                              <1> 	; Here, requested contiquous memory pages have been allocated
 14734                              <1> 	; on Memory Allocation Table but user's page directory 
 14735                              <1> 	; and page tables have not been updated yet!
 14736 00011ABE 51                  <1> 	push	ecx ; **
 14737                              <1> 	; ebx = virtual address (will be rounded up to page border)
 14738                              <1> 	; ecx = number of bytes to be deallocated
 14739                              <1> 	;	will be adjusted to ebx+ecx round down - ebx round up
 14740 00011ABF E80A4DFFFF          <1> 	call	deallocate_user_pages 
 14741 00011AC4 731F                <1> 	jnc	short sysalloc_4 ; EAX = Deallocated memory bytes
 14742 00011AC6 59                  <1> 	pop	ecx ; **
 14743 00011AC7 58                  <1> 	pop	eax ; *
 14744                              <1> sysalloc_3:
 14745                              <1> 	; error !
 14746                              <1> 	; restore Memory Allocation Table Content
 14747 00011AC8 E8B34BFFFF          <1> 	call	deallocate_memory_block
 14748 00011ACD 31C0                <1> 	xor	eax, eax ; 0
 14749 00011ACF 48                  <1> 	dec	eax ; 0FFFFFFFFh ; 15/05/2017
 14750 00011AD0 EB09                <1> 	jmp	short sysalloc_wrong
 14751                              <1> sysalloc_err:
 14752 00011AD2 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
 14753 00011AD8 894D18              <1> 	mov	[ebp+24], ecx ; return to user with ecx value 
 14754                              <1> sysalloc_wrong:
 14755                              <1> 	; eax = 0FFFFFFFFh
 14756 00011ADB A3[64030300]        <1> 	mov	[u.r0], eax
 14757 00011AE0 E9E7BDFFFF          <1> 	jmp	error
 14758                              <1> sysalloc_4:
 14759 00011AE5 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
 14760 00011AEB 894518              <1> 	mov	[ebp+24], eax ; return to user with ecx value 
 14761 00011AEE 895D10              <1> 	mov	[ebp+16], ebx ; new value of ebx (rounded up)
 14762 00011AF1 89C1                <1> 	mov	ecx, eax ; byte count (from 'deallocate_user_pages')
 14763 00011AF3 5A                  <1> 	pop	edx ; ** ; discard (another) byte count
 14764 00011AF4 58                  <1> 	pop	eax ; *
 14765 00011AF5 A3[64030300]        <1> 	mov	[u.r0], eax ; physical address
 14766                              <1> 	
 14767 00011AFA 51                  <1> 	push	ecx ; 20/08/2017
 14768                              <1> 	;
 14769                              <1> 	; Write newly allocated contiguous (physical) pages
 14770                              <1> 	; on page dir and page tables of current user/process	
 14771                              <1> 	; as PRESENT, USER, WRITABLE
 14772                              <1> 	; (then clear allocated pages)
 14773 00011AFB E8C34DFFFF          <1> 	call	allocate_user_pages
 14774                              <1> 	;jnc	sysret ; OK! return to process with success...
 14775                              <1> 
 14776                              <1> 	; 20/08/2017 ('sysdma' modification)
 14777 00011B00 59                  <1> 	pop	ecx
 14778 00011B01 A1[64030300]        <1> 	mov	eax, [u.r0]   ; physical address (of the block)
 14779                              <1> 
 14780 00011B06 721D                <1> 	jc	short sysalloc_6
 14781                              <1> 
 14782 00011B08 833D[54980100]FF    <1> 	cmp	dword [dma_addr], 0FFFFFFFFh ; -1	
 14783 00011B0F 0F82D7BDFFFF        <1> 	jb	sysret
 14784                              <1> 
 14785 00011B15 A3[54980100]        <1> 	mov	[dma_addr], eax ; save dma address for sysdma
 14786 00011B1A 890D[58980100]      <1> 	mov	[dma_size], ecx ; save dma buff size for sysdma
 14787                              <1> 
 14788 00011B20 E9C7BDFFFF          <1> 	jmp	sysret
 14789                              <1> 		
 14790                              <1> sysalloc_6:
 14791                              <1> 	;
 14792                              <1> 	; unexpected error ! insufficient memory !? conflict !?
 14793                              <1> 	; (!!?there is not a free page for a new page table?!!)
 14794                              <1> 	; We need to terminate process with error message !!!  
 14795                              <1> 	;
 14796 00011B25 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
 14797 00011B2B 8B4D18              <1> 	mov	ecx, [ebp+24] ; byte count
 14798                              <1> 	
 14799                              <1> 	; 20/08/2017
 14800                              <1> 	;mov	eax, [u.r0]   ; physical address (of the block)
 14801                              <1> 	
 14802                              <1> 	;
 14803                              <1> 	; restore Memory Allocation Table Content
 14804 00011B2E E84D4BFFFF          <1> 	call	deallocate_memory_block
 14805                              <1> 	;
 14806 00011B33 803D[BA6F0000]03    <1> 	cmp	byte [CRT_MODE], 3 ; 80x25 text mode?
 14807 00011B3A 7407                <1> 	je	short sysalloc_7 ; yes
 14808                              <1> 	; Current mode is VGA (or CGA graphics) mode,
 14809                              <1> 	; We need to return to text mode for displaying
 14810                              <1> 	; error message just before 'sysexit'.  
 14811 00011B3C B003                <1> 	mov	al, 3
 14812 00011B3E E82500FFFF          <1> 	call	_set_mode
 14813                              <1> sysalloc_7:
 14814 00011B43 BE[843B0100]        <1> 	mov	esi, beep_Insufficient_Memory ; error message
 14815 00011B48 E8F859FFFF          <1> 	call	print_msg ; print/display the message
 14816 00011B4D B801000000          <1> 	mov	eax, 1 ; ax=1 is needed for 'sysexit' procedure
 14817 00011B52 E91CBFFFFF          <1> 	jmp	sysexit ; and terminate the process !
 14818                              <1> 
 14819                              <1> sysdalloc:
 14820                              <1> 	; 19/02/2017 - TRDOS 386 (TRDOS v2.0)
 14821                              <1> 	; (TRDOS 386 feature only!)
 14822                              <1> 	;
 14823                              <1> 	; Deallocate Memory Block/Pages (for user)
 14824                              <1> 	; (Complementary call for sysalloc.)	
 14825                              <1> 	;
 14826                              <1> 	; INPUT ->
 14827                              <1> 	;	EBX = Virtual address (for user)
 14828                              <1> 	;	      (will be rounded up to page border)
 14829                              <1> 	;	ECX = Byte Count
 14830                              <1> 	;	     (will be adjusted to page borders)
 14831                              <1> 	;	If ICX = 0
 14832                              <1> 	;	   nothing to do
 14833                              <1> 	;	If EBX + ECX > User's ESP
 14834                              <1> 	;	   nothing to do		
 14835                              <1> 	; 
 14836                              <1> 	; Note: u.break control may be included in future versions	
 14837                              <1> 	;
 14838                              <1> 	; OUTPUT ->
 14839                              <1> 	;	If CF = 0
 14840                              <1> 	;	   EAX = Deallocated memory bytes
 14841                              <1> 	;	   EBX = Virtual address (as rounded up)	
 14842                              <1> 	;	IF CF = 1
 14843                              <1> 	;	   EAX = 0
 14844                              <1> 	;
 14845                              <1> 	; Note:	Main purpose of this call is to deallocate/release
 14846                              <1> 	;	previously allocated (physically) contiguous memory
 14847                              <1> 	;	pages but beginning (virtual) address may not be
 14848                              <1> 	;	followed by physically contiguous pages. So, this
 14849                              <1> 	;	system call will deallocate user's virtually
 14850                              <1> 	;	contiguous memory pages. Also, there is not any
 14851                              <1> 	;	objections to use this system call without sysalloc
 14852                              <1> 	;	system call; only possible objection is to lost data
 14853                              <1> 	;	within user's memory space, if the beginning address
 14854                              <1> 	;	and size is not proper.
 14855                              <1> 	;
 14856                              <1> 	; Note: Empty page tables will not be deallocated!!!
 14857                              <1> 	;       (they will be deallocated at process termination)
 14858                              <1> 	;
 14859                              <1> 	; Note: When the program terminates itself or when it is 
 14860                              <1> 	;	terminated by operating system kernel, all allocated
 14861                              <1> 	;	memory pages will be deallocated during termination
 14862                              <1> 	;	stage. So, 'sysdalloc' is not necessary except 
 14863                              <1> 	;	forgiving memory block to other programs/processes.
 14864                              <1> 	;	
 14865 00011B57 8B15[5C030300]      <1> 	mov	edx, [u.sp]
 14866 00011B5D 8B420C              <1> 	mov	eax, [edx+12] ; user's stack pointer
 14867 00011B60 29C8                <1> 	sub	eax, ecx ; esp - byte count
 14868 00011B62 24FC                <1> 	and	al, 0FCh ; dword alignment
 14869 00011B64 39D8                <1> 	cmp	eax, ebx
 14870 00011B66 7220                <1> 	jb	short sysdalloc_err ; deallocation overlaps with stack 	
 14871                              <1> 
 14872 00011B68 31C0                <1> 	xor	eax, eax
 14873 00011B6A 21C9                <1> 	and	ecx, ecx
 14874 00011B6C 7407                <1> 	jz	short sysdalloc_2
 14875                              <1> 	
 14876 00011B6E E85B4CFFFF          <1> 	call	deallocate_user_pages
 14877 00011B73 7213                <1> 	jc	short sysdalloc_err
 14878                              <1> 
 14879                              <1> sysdalloc_2:
 14880 00011B75 A3[64030300]        <1> 	mov	[u.r0], eax
 14881 00011B7A 8B2D[60030300]      <1> 	mov	ebp, [u.usp]
 14882 00011B80 895D10              <1> 	mov	[ebp+16], ebx ; new value of ebx
 14883 00011B83 E964BDFFFF          <1> 	jmp	sysret
 14884                              <1> 
 14885                              <1> sysdalloc_err:
 14886 00011B88 A3[64030300]        <1> 	mov	[u.r0], eax ; 0
 14887 00011B8D E93ABDFFFF          <1> 	jmp	error
 14888                              <1> 
 14889                              <1> syscalbac:
 14890                              <1> 	; SYS CALLBACK
 14891                              <1> 	; 03/08/2020
 14892                              <1> 	; 16/04/2017
 14893                              <1> 	; 14/04/2017
 14894                              <1> 	; 13/04/2017
 14895                              <1> 	; 28/02/2017
 14896                              <1> 	; 26/02/2017
 14897                              <1> 	; 24/02/2017
 14898                              <1> 	; 21/02/2017 - TRDOS 386 (TRDOS v2.0)
 14899                              <1> 	; (TRDOS 386 feature only!)
 14900                              <1> 	;
 14901                              <1> 	; Link or unlink IRQ callback service to/from user (ring 3)	
 14902                              <1> 	;
 14903                              <1> 	; INPUT ->
 14904                              <1> 	;	BL = IRQ number (Hardware interrupt request number)
 14905                              <1> 	;	     (0 t0 15 but IRQ 0,1,2,6,8,14,15 are prohibited)
 14906                              <1> 	;	     IRQ numbers 3,4,5,7,9,10,11,12,13 are valid
 14907                              <1> 	;	     (numbers >15 are invalid)
 14908                              <1> 	;
 14909                              <1> 	;	BH = 0 = Unlink IRQ (in BL) from user (ring 3) service
 14910                              <1> 	;	     1 = Link IRQ by using Signal Response Byte method
 14911                              <1> 	;	     2 = Link IRQ by using Callback service method 		
 14912                              <1> 	;	     3 = Link IRQ by using Auto Increment S.R.B. method 	
 14913                              <1> 	;	    >3 = invalid 
 14914                              <1> 	;	
 14915                              <1> 	;	CL = Signal Return/Response Byte value 
 14916                              <1> 	;
 14917                              <1> 	;	If BH = 3, kernel will put a counter value  ; 03/08/2020
 14918                              <1> 	;	          (into the S.R.B. addr)
 14919                              <1> 	;		  between 0 to 255. (start value = CL+1)
 14920                              <1> 	;	
 14921                              <1> 	;	NOTE: counter value, for example: even and odd numbers
 14922                              <1> 	;	      may be used for -audio- DMA buffer switch 
 14923                              <1> 	;	      within double buffer method, etc. 		
 14924                              <1> 	;
 14925                              <1> 	;	EDX = Signal return (Response) byte address
 14926                              <1> 	;	       		  - or -
 14927                              <1> 	;	      Interrupt/Callback service/routine address
 14928                              <1> 	; 	
 14929                              <1> 	;	      (virtual address in user's memory space)
 14930                              <1> 	;
 14931                              <1> 	; OUTPUT ->
 14932                              <1> 	;	CF = 0 & EAX = 0 -> Successful setting
 14933                              <1> 	;	CF = 1 & EAX > 0 -> IRQ is prohibited or locked 
 14934                              <1> 	;			by another process
 14935                              <1> 	;		 eax = ERR_PERM_DENIED -> prohibited or locked
 14936                              <1> 	;		 eax = ERR_INV_PARAMETER -> 
 14937                              <1> 	;		       invalid parameter/option or bad address
 14938                              <1> 	;
 14939                              <1> 	;	NOTE: Timer callbacks are set by using 'systimer'
 14940                              <1> 	;	      system call (IRQ 0, PIT and IRQ 8, RTC)
 14941                              <1> 	;
 14942                              <1> 	;	      Direct keyboard access is performed by using
 14943                              <1> 	;	      Keyboard Interrupt (INT 32h)	 	
 14944                              <1> 	;	
 14945                              <1> 	;	      It is prohibited here because:
 14946                              <1> 	;		1) Signal Response Byte method has not advantage
 14947                              <1> 	;		   against INT 32h, function AH = 1. Also,
 14948                              <1> 	;		   keyboard service interrupt will return with
 14949                              <1> 	;		   ascii and scan codes (AL, AH) while
 14950                              <1> 	;		   SRB method has only 1 byte space for ascii code
 14951                              <1> 	;		   or scan code. One byte signal response is used 
 14952                              <1> 	;		   for ensuring very simple and very fast
 14953                              <1> 	;		   virtual to physical memory address conversion
 14954                              <1> 	;		   without any memory page crossover risk. 
 14955                              <1> 	;		   (Otherwise double page conversion or word 
 14956                              <1> 	;		   alignment would be needed.)
 14957                              <1> 	;		2) Badly written user code (callback code)
 14958                              <1> 	;		   can prevent keyboard and timesharing functions
 14959                              <1> 	;		   of the operating system via continuous and long
 14960                              <1> 	;		   keyboard event handling by callback service.
 14961                              <1> 	;		   (It can cause to lose immediate keystroke 
 14962                              <1> 	;		   response from hardware to user.)
 14963                              <1> 	;		3) If user will check any keyboard events, 'getkey'
 14964                              <1> 	;		   (or 'getchar') must have more priority than other
 14965                              <1> 	;		   (video etc.) events because only control ability
 14966                              <1> 	;		   on a procedural infinite loop is a keyboard or
 14967                              <1> 	;		   mouse event. So user can use keyboard function
 14968                              <1> 	;		   at the end or at the beginning of a loop.
 14969                              <1> 	;		   In this case, INT 32h is used for that purpose
 14970                              <1> 	;		   and timer interrupt etc. callbacks can be used
 14971                              <1> 	;		   for dynamic and synchronized data refresh/transfer
 14972                              <1> 	;		   while cpu is in a static loop (without polling).
 14973                              <1> 	;		   Keyboard Int callback is not more useful because 
 14974                              <1> 	;		   already a manual check (a key is pressed or not)
 14975                              <1> 	;		   can be performed (via INT 32h, AH = 1) efficiently
 14976                              <1> 	;		   in a loop to prevent a locked infinitive loop.
 14977                              <1> 	;
 14978                              <1> 	;	    Disk IRQs (6,14,15) have been phohibited from ring 3 
 14979                              <1> 	;	    callback because, disk operations (file system services
 14980                              <1> 	;	    etc.) are independent from user program, for fast disk r/w.
 14981                              <1> 	;	    They are not more useful at ring 3 while they are in use
 14982                              <1> 	;	    by standard diskio functions which are mandatory part of 
 14983                              <1> 	;	    (monolithic) OS kernel and mainprog command interpreter.
 14984                              <1> 	;	    INT 33h diskio functions are enough for user level disk
 14985                              <1> 	;	    r/w.				
 14986                              <1> 	;
 14987                              <1> 	; TRDOS 386 - IRQ CALLBACK structures (parameters):
 14988                              <1> 	;	
 14989                              <1> 	;	   [u.irqlock] = 1 word, IRQ flags (0-15) that indicates
 14990                              <1> 	;			which IRQs are locked by (that) user.
 14991                              <1> 	;		        Lock and unlock (by user) will change
 14992                              <1> 	;			these flags or 'terminate process' (sysexit)
 14993                              <1> 	;			will clear these flags and unlock those IRQs.
 14994                              <1> 	;			               
 14995                              <1> 	;		   	Bit 0 is for IRQ 0 and Bit 15 is for IRQ 15
 14996                              <1> 	;
 14997                              <1> 	;	   IRQ(x).owner	 : 1 byte, user, [u.uno], 0 = free (unlocked)	
 14998                              <1> 	;
 14999                              <1> 	;	   IRQ(x).method : 1 byte for callback method & status
 15000                              <1> 	;			   0 = Signal Response Byte method
 15001                              <1> 	;			   1 = Callback service method
 15002                              <1> 	;			   >1 = invalid for current 'syscalback'.
 15003                              <1> 	;			or(+) 80h = IRQ is in use by system (ring 0)
 15004                              <1> 	;			            function (audio etc.) or
 15005                              <1> 	;			   	    a device driver.	   	
 15006                              <1> 	;			(system function will ignore the lock/owner)
 15007                              <1> 	;
 15008                              <1> 	;	   IRQ(x).srb	: 1 byte, Signal Return/Response byte value
 15009                              <1> 	;			  (a fixed value by user or a counter value
 15010                              <1> 	;			 from 0 to 255, which is increased by every
 15011                              <1> 	;			 interrupt just before putting it into 
 15012                              <1> 	;			 the Signal Response byte address
 15013                              <1> 	;			 (This is not used in callback serv method)
 15014                              <1> 	;	    	  
 15015                              <1> 	;	   IRQ(x).addr	: 1 dword
 15016                              <1> 	;			  Signal Response Byte address (physical)
 15017                              <1> 	;			  		-or-
 15018                              <1> 	;			  Callback service address (virtual)
 15019                              <1> 	;
 15020                              <1> 	;	   IRQ(x).dev	: 1 byte
 15021                              <1> 	;			  0 = Default device or kernel function
 15022                              <1> 	;			  		-or-
 15023                              <1> 	;			  1-255 = Assigned device driver number
 15024                              <1> 	;
 15025                              <1> 	;	   (x) = 3,4,5,7,9,10,11,12,13
 15026                              <1> 	;
 15027                              <1> 	;	
 15028                              <1> 	;	NOTE: If user's process/program calls the kernel (INT 40h)
 15029                              <1> 	;	      while it is already running in a (ring 3) callback
 15030                              <1> 	;	      service, kernel will force (convert) system call to
 15031                              <1> 	;	      'sysrele' (sys release). So, this feature provides
 15032                              <1> 	;	      easy and simple usage of callback services without
 15033                              <1> 	;	      falling into deepless <please 'callback me' then 
 15034                              <1> 	;	      let me 'callback you'> cycles! (User must return
 15035                              <1> 	;	      from callback service by using 'sysrele' system
 15036                              <1> 	;	      call, without a significant delay. Otherwise user
 15037                              <1> 	;	      process/program may be late to catch the next event
 15038                              <1> 	;	      within same callback purpose.	    		 	
 15039                              <1> 	;
 15040                              <1> 
 15041 00011B92 30C0                <1> 	xor	al, al ; the caller is 'syscalbac' sign/flag
 15042 00011B94 E85F180000          <1>  	call	set_irq_callback_service
 15043                              <1> 	; 16/04/2017
 15044 00011B99 A3[64030300]        <1> 	mov	[u.r0], eax
 15045 00011B9E 0F8348BDFFFF        <1> 	jnc	sysret
 15046 00011BA4 A3[C8030300]        <1> 	mov	dword [u.error], eax
 15047 00011BA9 E91EBDFFFF          <1> 	jmp	error
 15048                              <1> 
 15049                              <1> sysfpstat:
 15050                              <1> 	; 28/02/2017 - TRDOS 386 (TRDOS v2.0)
 15051                              <1> 	; (TRDOS 386 feature only!)
 15052                              <1> 	;
 15053                              <1> 	; Set or reset FPU registers save/restore option (for user)
 15054                              <1> 	;	       (during software task switching, wswap-rswap)
 15055                              <1> 	;
 15056                              <1> 	; INPUT ->
 15057                              <1> 	;	BL = 0 -> reset
 15058                              <1> 	;	BL = 1 -> set (FPU register will be saved and restored)
 15059                              <1> 	;	
 15060                              <1> 	; OUTPUT ->
 15061                              <1> 	;	cf = 0 -> no error, FPU is ready... 
 15062                              <1> 	;		  (EAX = 0)
 15063                              <1> 	;	Cf = 1 -> error, 80387 FPU is not ready !
 15064                              <1> 	;		  (EAX = 0FFFFFFFFh)
 15065                              <1> 
 15066 00011BAE 31C0                <1> 	xor	eax, eax
 15067 00011BB0 803D[4C8E0100]00    <1> 	cmp	byte [fpready], 0
 15068 00011BB7 7613                <1> 	jna	short sysfpstat_err	
 15069                              <1> 
 15070 00011BB9 80E301              <1> 	and	bl, 1 ; use BIT 0 only !
 15071 00011BBC 881D[DA030300]      <1> 	mov	[u.fpsave], bl
 15072 00011BC2 A3[64030300]        <1> 	mov	[u.r0], eax ; 0
 15073 00011BC7 E920BDFFFF          <1> 	jmp	sysret	 	
 15074                              <1> 
 15075                              <1> sysfpstat_err:
 15076 00011BCC 48                  <1> 	dec 	eax ; 0FFFFFFFFh
 15077 00011BCD A3[64030300]        <1> 	mov 	[u.r0], eax ; -1
 15078 00011BD2 E9F5BCFFFF          <1> 	jmp 	error
 15079                              <1> 
 15080                              <1> sysdelete: ; Delete (Remove, Unlink) File
 15081                              <1> 	; 29/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15082                              <1> 	;	
 15083                              <1>         ; INPUT ->
 15084                              <1>         ;          EBX = File name (ASCIIZ string) address
 15085                              <1> 	; OUTPUT ->
 15086                              <1> 	;          cf = 0 -> eax = 0
 15087                              <1> 	;          cf = 1 -> Error code in AL
 15088                              <1> 	;
 15089                              <1> 	; Modified Registers: EAX (at the return of system call)
 15090                              <1> 	;   
 15091                              <1> 
 15092 00011BD7 89DE                <1> 	mov	esi, ebx
 15093                              <1> 	; file name is forced, change directory as temporary
 15094                              <1> 	;mov	ax, 1
 15095                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset
 15096                              <1> 	;call	set_working_path 
 15097 00011BD9 E8620B0000          <1> 	call	set_working_path_x
 15098 00011BDE 731D                <1> 	jnc	short sysdelete_1
 15099                              <1> 
 15100 00011BE0 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
 15101 00011BE2 7505                <1> 	jnz	short sysdelete_err
 15102                              <1> 	; eax = 0
 15103                              <1> sysdelete_path_err:
 15104 00011BE4 B813000000          <1> 	mov	eax, ERR_INV_PATH_NAME ; 'bad path name !'
 15105                              <1> sysdelete_err:
 15106 00011BE9 A3[64030300]        <1> 	mov	[u.r0], eax
 15107 00011BEE A3[C8030300]        <1> 	mov	[u.error], eax
 15108 00011BF3 E81D0C0000          <1> 	call 	reset_working_path
 15109 00011BF8 E9CFBCFFFF          <1> 	jmp	error
 15110                              <1> sysdelete_1:
 15111                              <1> 	;mov	esi, FindFile_Name
 15112 00011BFD 66B80018            <1> 	mov	ax, 1800h ; Only files
 15113 00011C01 E86B78FFFF          <1> 	call	find_first_file
 15114 00011C06 72E1                <1> 	jc	short sysdelete_err
 15115                              <1> sysdelete_2:
 15116                              <1> 	; check file attributes
 15117                              <1> 
 15118                              <1> 	;test	bl, 17 ; system, hidden, readonly, directory
 15119 00011C08 F6C307              <1>         test	bl, 7 ; system, hidden, readonly 
 15120 00011C0B 7407                <1>         jz	short sysdelete_3
 15121                              <1> 
 15122 00011C0D B80B000000          <1>         mov	eax, ERR_FILE_ACCESS ; 11 = 'permission denied !'
 15123 00011C12 EBD5                <1>         jmp	short sysdelete_err
 15124                              <1> sysdelete_3:
 15125 00011C14 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
 15126 00011C17 7407                <1> 	jz	short sysdelete_4
 15127 00011C19 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME ; 26 = 'invalid file name !'
 15128 00011C1E EBC9                <1>         jmp	short sysdelete_err
 15129                              <1> sysdelete_4:
 15130                              <1> 	;mov	bh, [LongName_EntryLength]
 15131 00011C20 883D[BE8B0100]      <1> 	mov	[DelFile_LNEL], bh ; Long name entry length (if > 0)
 15132                              <1> 	; edi = Directory Entry Offset (DirBuff)
 15133                              <1> 	; esi = Directory Entry (FFF Structure)
 15134 00011C26 E8C3A1FFFF          <1> 	call	remove_file
 15135 00011C2B 72BC                <1> 	jc	short sysdelete_err
 15136                              <1> sysrmdir_5:
 15137 00011C2D 31C0                <1> 	xor	eax, eax ; 0
 15138 00011C2F A3[64030300]        <1> 	mov	[u.r0], eax
 15139                              <1> 	;mov	[u.error], eax
 15140 00011C34 E8DC0B0000          <1> 	call 	reset_working_path
 15141 00011C39 E9AEBCFFFF          <1> 	jmp	sysret
 15142                              <1> 
 15143                              <1> 
 15144                              <1> sysrmdir: ; Remove (Unlink) Directory
 15145                              <1> 	; 19/01/2021
 15146                              <1> 	; 29/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15147                              <1> 	;	
 15148                              <1>         ; INPUT ->
 15149                              <1>         ;          EBX = Pointer to directory name
 15150                              <1> 	; OUTPUT ->
 15151                              <1> 	;          cf = 0 -> eax = 0
 15152                              <1> 	;          cf = 1 -> Error code in AL
 15153                              <1> 	;
 15154                              <1> 	; Modified Registers: EAX (at the return of system call)
 15155                              <1> 	;  
 15156                              <1> 
 15157                              <1> 	; 19/01/2021
 15158 00011C3E 803D[B0030300]00    <1> 	cmp	byte [u.uid], 0  ; root (super user) ?
 15159 00011C45 7614                <1> 	jna	short sysrmdir_0
 15160                              <1> 
 15161                              <1> 	;mov	dword [u.r0], ERR_PERM_DENIED
 15162 00011C47 B80B000000          <1> 	mov	eax, ERR_PERM_DENIED ; ERR_NOT_SUPERUSER
 15163 00011C4C A3[64030300]        <1> 	mov	[u.r0], eax
 15164 00011C51 A3[C8030300]        <1> 	mov	[u.error], eax
 15165 00011C56 E971BCFFFF          <1> 	jmp	error
 15166                              <1> 
 15167                              <1> sysrmdir_0:
 15168 00011C5B 89DE                <1> 	mov	esi, ebx
 15169                              <1> 	; file name is forced, change directory as temporary
 15170                              <1> 	;mov	ax, 1
 15171                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset
 15172                              <1> 	;call	set_working_path 
 15173 00011C5D E8DE0A0000          <1> 	call	set_working_path_x
 15174 00011C62 731D                <1> 	jnc	short sysrmdir_1
 15175                              <1> 
 15176 00011C64 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
 15177 00011C66 7505                <1> 	jnz	short sysrmdir_err
 15178                              <1> 	; eax = 0
 15179                              <1> sysrmdir_not_found:
 15180 00011C68 B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
 15181                              <1> sysrmdir_err:
 15182 00011C6D A3[64030300]        <1> 	mov	[u.r0], eax
 15183 00011C72 A3[C8030300]        <1> 	mov	[u.error], eax
 15184 00011C77 E8990B0000          <1> 	call 	reset_working_path
 15185 00011C7C E94BBCFFFF          <1> 	jmp	error
 15186                              <1> sysrmdir_1:
 15187                              <1> 	;mov	esi, FindFile_Name
 15188 00011C81 66B81008            <1> 	mov	ax, 0810h ; Only directories
 15189 00011C85 E8E777FFFF          <1> 	call	find_first_file
 15190 00011C8A 7306                <1> 	jnc	short sysrmdir_2
 15191                              <1> 
 15192                              <1> 	; eax = 2 (File not found !)
 15193 00011C8C 3C02                <1> 	cmp	al, 2 ; ERR_NOT_FOUND
 15194 00011C8E 74D8                <1> 	je	short sysrmdir_not_found
 15195 00011C90 EBDB                <1> 	jmp	short sysrmdir_err
 15196                              <1> sysrmdir_2:
 15197                              <1> 	; check directory attributes
 15198                              <1> 
 15199 00011C92 F6C307              <1>         test	bl, 7 ; system, hidden, readonly 
 15200 00011C95 7407                <1>         jz	short sysrmdir_3
 15201                              <1> 
 15202 00011C97 B80B000000          <1>         mov	eax, ERR_DIR_ACCESS ; 11 = 'permission denied !'
 15203 00011C9C EBCF                <1>         jmp	short sysrmdir_err
 15204                              <1> sysrmdir_3:
 15205 00011C9E 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
 15206 00011CA1 7407                <1> 	jz	short sysrmdir_4
 15207                              <1> 	;mov	eax, ERR_NOT_DIR ; 'not a valid directory !'
 15208 00011CA3 B813000000          <1> 	mov	eax, ERR_INV_PATH_NAME ; 'bad path name !'
 15209 00011CA8 EBC3                <1>         jmp	short sysrmdir_err
 15210                              <1> sysrmdir_4:
 15211                              <1> 	;mov	bh, [LongName_EntryLength]
 15212 00011CAA 883D[BE8B0100]      <1> 	mov	[DelFile_LNEL], bh ; Long name entry length (if > 0)
 15213                              <1> 	; edi = Directory Entry Offset (DirBuff)
 15214                              <1> 	; esi = Directory Entry (FFF Structure)
 15215 00011CB0 E8917EFFFF          <1> 	call	delete_sub_directory
 15216 00011CB5 0F8372FFFFFF        <1> 	jnc	sysrmdir_5
 15217                              <1> ;	jc	short sysrmdir_6
 15218                              <1> ;
 15219                              <1> ;	xor	eax, eax ; 0
 15220                              <1> ;sysrmdir_5:
 15221                              <1> ;	mov	[u.r0], eax
 15222                              <1> ;	;mov	[u.error], eax
 15223                              <1> ;	call 	reset_working_path
 15224                              <1> ;	jmp	sysret
 15225                              <1> sysrmdir_6:
 15226 00011CBB A3[64030300]        <1> 	mov	[u.r0], eax
 15227 00011CC0 A3[C8030300]        <1> 	mov	[u.error], eax
 15228                              <1> 
 15229 00011CC5 09C0                <1> 	or	eax, eax ; EAX = 0 -> Directory not empty!
 15230 00011CC7 741C                <1> 	jz	short sysrmdir_9
 15231                              <1> 
 15232                              <1> 	; EAX > 0 -> Error code in AL (or AX or EAX)
 15233                              <1> 
 15234 00011CC9 833D[72890100]01    <1> 	cmp	dword [FAT_ClusterCounter], 1
 15235 00011CD0 7209                <1> 	jb	short sysrmdir_8
 15236                              <1> sysrmdir_7:
 15237                              <1> 	; ESI = Logical DOS Drive Description Table address	
 15238 00011CD2 66BB00FF            <1> 	mov	bx, 0FF00h ; BH = FFh -> use ESI for Drive parameters
 15239                              <1> 	           ; BL = 0 -> Recalculate free cluster count
 15240 00011CD6 E8F7B6FFFF          <1> 	call	calculate_fat_freespace	
 15241                              <1> sysrmdir_8:
 15242 00011CDB E8350B0000          <1> 	call 	reset_working_path
 15243 00011CE0 E9E7BBFFFF          <1> 	jmp	error
 15244                              <1> 
 15245                              <1> sysrmdir_9:
 15246 00011CE5 A1[72890100]        <1> 	mov	eax, [FAT_ClusterCounter]
 15247 00011CEA 09C0                <1> 	or	eax, eax ; 0 ?
 15248 00011CEC 0F847BFFFFFF        <1> 	jz	sysrmdir_err
 15249                              <1> 	; ESI = Logical DOS Drive Description Table address	
 15250 00011CF2 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> use ESI for Drive parameters
 15251                              <1> 	           ; BL = 1 -> add free clusters
 15252 00011CF6 E8D7B6FFFF          <1> 	call	calculate_fat_freespace
 15253 00011CFB 09C9                <1> 	or	ecx, ecx
 15254 00011CFD 74DC                <1>         jz	short sysrmdir_8 ; ecx = 0 -> OK
 15255                              <1> 	; ecx > 0 -> Error (Recalculation is needed)
 15256 00011CFF EBD1                <1> 	jmp	short sysrmdir_7
 15257                              <1> 
 15258                              <1> 
 15259                              <1> syschdir: ; Change Current (Working) Drive & Directory (for user)
 15260                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15261                              <1> 	;	
 15262                              <1>         ; INPUT ->
 15263                              <1>         ;          EBX = Directory name (ASCIIZ string) address
 15264                              <1> 	; OUTPUT ->
 15265                              <1> 	;          cf = 0 -> eax = 0
 15266                              <1> 	;          cf = 1 -> Error code in AL
 15267                              <1> 	;
 15268                              <1> 	; Modified Registers: EAX (at the return of system call)
 15269                              <1> 	;
 15270                              <1> 	; NOTE: If drive name is not included, only the working
 15271                              <1> 	; directory (for user, not for drive/OS) will be chanded.
 15272                              <1> 	; If there is a drive name (as A:, B:, C:, D: etc.)
 15273                              <1> 	; at the beginning of the ASCIIZ (directory) string,
 15274                              <1> 	; working drive and working directory (for user) 
 15275                              <1> 	; will be changed together.
 15276                              <1> 	; (When the program is terminated, MainProg -internal 
 15277                              <1> 	; shell- will reset working directory to the previous
 15278                              <1> 	; -current- logical drive's current directory again.) 	
 15279                              <1>   
 15280 00011D01 89DE                <1> 	mov	esi, ebx
 15281                              <1> 	; file name is not forced, change directory as temporary
 15282 00011D03 31C0                <1> 	xor	eax, eax
 15283                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset
 15284                              <1> 	;call	set_working_path 
 15285 00011D05 E83A0A0000          <1> 	call	set_working_path_xx
 15286 00011D0A 731D                <1> 	jnc	short syschdir_ok
 15287 00011D0C 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
 15288 00011D0E 7505                <1> 	jnz	short syschdir_err
 15289                              <1> 	; eax = 0
 15290                              <1> syschdir_not_found:
 15291 00011D10 B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
 15292                              <1> syschdir_err:
 15293 00011D15 A3[64030300]        <1> 	mov	[u.r0], eax
 15294 00011D1A A3[C8030300]        <1> 	mov	[u.error], eax
 15295 00011D1F E8F10A0000          <1> 	call 	reset_working_path
 15296 00011D24 E9A3BBFFFF          <1> 	jmp	error
 15297                              <1> syschdir_ok:
 15298 00011D29 31C0                <1> 	xor	eax, eax ; 0
 15299 00011D2B A3[64030300]        <1> 	mov	[u.r0], eax
 15300                              <1> 	;mov	[u.error], eax
 15301 00011D30 E9B7BBFFFF          <1> 	jmp	sysret
 15302                              <1> 
 15303                              <1> 
 15304                              <1> syschmod: ; Get & Change File (or Directory) Attributes
 15305                              <1> 	; 19/01/2021
 15306                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15307                              <1> 	;	
 15308                              <1>         ; INPUT ->
 15309                              <1>         ;          EBX = File/Directory (ASCIIZ) name address
 15310                              <1> 	;	    CL = New attributes (if CL < 40h)
 15311                              <1> 	;	    CL >= 40h -> Get File Attributes		
 15312                              <1> 	; OUTPUT ->
 15313                              <1> 	;          cf = 0 -> EAX = File attributes (in AL)
 15314                              <1> 	;          cf = 1 -> Error code in AL
 15315                              <1> 	;
 15316                              <1> 	; Modified Registers: EAX (at the return of system call)
 15317                              <1> 	;  
 15318                              <1> 	; MSDOS File Attributes:    (bit value of attrib byte)
 15319                              <1> 	;	ATTR_READ_ONLY	=	01h  (bit 0, 'R')
 15320                              <1> 	;	ATTR_HIDDEN	=	02h  (bit 1, 'H')
 15321                              <1> 	;	ATTR_SYSTEM	=	04h  (bit 2, 'S')
 15322                              <1> 	;	ATTR_VOLUME_ID	=	08h  (bit 3)
 15323                              <1> 	;	ATTR_DIRECTORY	=	10h  (bit 4)
 15324                              <1> 	;	ATTR_ARCHIVE	=	20h  (bit 5, 'A')
 15325                              <1> 	;	ATTR_LONG_NAME	=	ATTR_READONLY |
 15326                              <1> 	;				ATTR_HIDDEN |
 15327                              <1> 	;				ATTR_SYSTEM |
 15328                              <1> 	;				ATTR_VOLUME_ID				
 15329                              <1> 	;	The upper two bits of attributes must be 0.
 15330                              <1> 
 15331                              <1> 	; Note:	* If ATTR_DIRECTORY is set, only directory names
 15332                              <1> 	;	  will be searched (and S,H,R,A attributeds of 
 15333                              <1> 	;	  the directory will be changed.)
 15334                              <1> 	;	* If ATTR_VOLUME_ID is set, 'syschmod' system call
 15335                              <1> 	;	  will return with 'permission denied' error.
 15336                              <1> 	;	* If ATTR_DIRECTORY is not set, only file names
 15337                              <1> 	;	  will be searched (and S,H,R,A attributes of the
 15338                              <1> 	;	  file will be changed.)
 15339                              <1> 	;
 15340                              <1> 	; (Ony Super User can change S,H,R attributes.) 
 15341                              <1> 
 15342 00011D35 80F940              <1> 	cmp	cl, 40h	
 15343 00011D38 7327                <1> 	jnb	short syschmod_0
 15344                              <1> 
 15345 00011D3A F6C108              <1> 	test	cl, 08h ; ATTR_VOLUME_ID
 15346 00011D3D 750E                <1> 	jnz	short syschmod_perm_err
 15347                              <1> 
 15348                              <1> 	; 19/01/2021
 15349 00011D3F 803D[B0030300]00    <1> 	cmp	byte [u.uid], 0  ; root (super user) ?
 15350 00011D46 7619                <1> 	jna	short syschmod_0
 15351                              <1> 
 15352                              <1> 	; Not super user..
 15353 00011D48 F6C107              <1> 	test	cl, 07h	; S,H,R attributes
 15354 00011D4B 7414                <1> 	jz	short syschmod_0
 15355                              <1> 
 15356                              <1> syschmod_perm_err:
 15357                              <1> 	;mov	dword [u.r0], ERR_PERM_DENIED
 15358 00011D4D B80B000000          <1> 	mov	eax, ERR_PERM_DENIED ; 'permission denied !'
 15359 00011D52 A3[64030300]        <1> 	mov	[u.r0], eax
 15360 00011D57 A3[C8030300]        <1> 	mov	[u.error], eax
 15361 00011D5C E96BBBFFFF          <1> 	jmp	error
 15362                              <1> 
 15363                              <1> syschmod_0:
 15364 00011D61 880D[0C8C0100]      <1> 	mov	[Attributes], cl
 15365 00011D67 89DE                <1> 	mov	esi, ebx
 15366                              <1> 	; file name is forced, change directory as temporary
 15367                              <1> 	;mov	ax, 1
 15368                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset
 15369                              <1> 	;call	set_working_path 
 15370 00011D69 E8D2090000          <1> 	call	set_working_path_x
 15371 00011D6E 731D                <1> 	jnc	short syschmod_1
 15372 00011D70 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
 15373 00011D72 7505                <1> 	jnz	short syschmod_err
 15374                              <1> 	; eax = 0
 15375                              <1> syschmod_path_not_found:
 15376 00011D74 B813000000          <1> 	mov	eax, ERR_INV_PATH_NAME ; 'Bad path name !'
 15377                              <1> syschmod_err:
 15378 00011D79 A3[64030300]        <1> 	mov	[u.r0], eax
 15379 00011D7E A3[C8030300]        <1> 	mov	[u.error], eax
 15380 00011D83 E88D0A0000          <1> 	call 	reset_working_path
 15381 00011D88 E93FBBFFFF          <1> 	jmp	error
 15382                              <1> syschmod_1:
 15383 00011D8D B008                <1> 	mov	al, 08h ; Except volume labels (& long names)
 15384 00011D8F A0[0C8C0100]        <1> 	mov	al, [Attributes]
 15385 00011D94 2410                <1> 	and	al, 10h ;
 15386                              <1> 	;mov	esi, FindFile_Name
 15387                              <1> 	;mov	ax, 1800h ; Only files
 15388                              <1> 	;mov	ax, 0810h ; Only directories
 15389 00011D96 E8D676FFFF          <1> 	call	find_first_file
 15390                              <1> 	;jnc	short syschmod_2
 15391 00011D9B 72DC                <1> 	jc	short syschmod_err
 15392                              <1> 
 15393                              <1> 	;; eax = 2 (File not found !)
 15394                              <1> 	;cmp	al, 2 ; ERR_NOT_FOUND
 15395                              <1> 	;jne	short syschmod_err
 15396                              <1> 
 15397                              <1> 	;and	byte [Attributes], 10h
 15398                              <1> 	;jz	short syschmod_err
 15399                              <1> 
 15400                              <1> 	;; Directory not found !
 15401                              <1> 	;mov	al, 3 ; ERR_PATH_NOT_FOUND
 15402                              <1> 	;jmp	short syschmod_err
 15403                              <1> 
 15404                              <1> syschmod_2:
 15405 00011D9D 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
 15406 00011DA0 7407                <1> 	jz	short syschmod_3
 15407 00011DA2 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME ; 'invalid file name !'
 15408 00011DA7 EBD0                <1>         jmp	short syschmod_err
 15409                              <1> syschmod_3:
 15410                              <1> 	; EDI = Directory buffer entry offset/address
 15411                              <1> 	; BL = File (or Directory) Attributes 
 15412                              <1> 	; mov	bl, [EDI+0Bh]
 15413                              <1> 
 15414                              <1> 	; check directory attributes
 15415 00011DA9 8A3D[0C8C0100]      <1> 	mov	bh, [Attributes] ; new attributes
 15416 00011DAF 80FF40              <1> 	cmp	bh, 40h  ;>=40 -> get file/directory attributes
 15417 00011DB2 732D                <1> 	jnb	short syschmod_6
 15418                              <1> 
 15419                              <1> 	; set file/directory attributes
 15420 00011DB4 F6C307              <1> 	test	bl, 7 ; system, hidden, readonly 
 15421 00011DB7 7409                <1>         jz	short syschmod_4
 15422                              <1> 
 15423                              <1> 	; 19/01/2021
 15424 00011DB9 803D[B0030300]00    <1> 	cmp	byte [u.uid], 0  ; root (super user) ?
 15425 00011DC0 778B                <1> 	ja	short syschmod_perm_err
 15426                              <1> syschmod_4:
 15427 00011DC2 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h ; Singlix FS
 15428 00011DC8 7424                <1> 	je	short syschmod_7
 15429                              <1> 
 15430 00011DCA 887F0B              <1> 	mov	[edi+0Bh], bh    ; Attributes (New!)
 15431                              <1> 
 15432 00011DCD C605[7C890100]02    <1> 	mov	byte [DirBuff_ValidData], 2 ; modified sign
 15433                              <1> 					    ; to force write	
 15434 00011DD4 E8CD9CFFFF          <1> 	call 	save_directory_buffer
 15435 00011DD9 729E                <1> 	jc	short syschmod_err
 15436                              <1> 
 15437                              <1> syschmod_5:
 15438 00011DDB 8A1D[0C8C0100]      <1> 	mov	bl, [Attributes]
 15439                              <1> syschmod_6:
 15440 00011DE1 0FB6C3              <1> 	movzx	eax, bl
 15441 00011DE4 A3[64030300]        <1> 	mov	[u.r0], eax
 15442                              <1> 	;mov	dword [u.error], 0
 15443 00011DE9 E9FEBAFFFF          <1> 	jmp	sysret
 15444                              <1> 
 15445                              <1> syschmod_7:
 15446 00011DEE 29C0                <1> 	sub	eax, eax
 15447 00011DF0 8A25[7A890100]      <1>         mov     ah, [DirBuff_DRV]
 15448 00011DF6 BE00010900          <1> 	mov	esi, Logical_DOSDisks
 15449 00011DFB 01C6                <1>         add     esi, eax
 15450 00011DFD 807E04A1            <1>         cmp     byte [esi+LD_FSType], 0A1h
 15451 00011E01 7307                <1> 	jnc	short syschmod_8
 15452 00011E03 B01D                <1> 	mov	al, ERR_INV_DATA ; 29 = Invalid Data
 15453 00011E05 E96FFFFFFF          <1> 	jmp	syschmod_err
 15454                              <1> 
 15455                              <1> syschmod_8:
 15456                              <1> 	; BH = New MS-DOS File Attributes
 15457 00011E0A 88F8                <1> 	mov	al, bh ; File/Directory Attributes
 15458 00011E0C 30E4                <1> 	xor	ah, ah ; Attributes in MS-DOS format sign	  
 15459 00011E0E E8BC87FFFF          <1> 	call	change_fs_file_attributes
 15460 00011E13 0F8260FFFFFF        <1> 	jc	syschmod_err
 15461 00011E19 EBC0                <1> 	jmp	short syschmod_5
 15462                              <1> 
 15463                              <1> 
 15464                              <1> sysdrive: ; Get/Set Current (Working) Drive (for user)
 15465                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15466                              <1> 	;	
 15467                              <1>         ; INPUT ->
 15468                              <1>         ;          BL = Logical DOS Drive number (0=A: ... 2=C:)
 15469                              <1> 	;	   If BL = 0FFh -> Get Current Drive 	
 15470                              <1> 	; OUTPUT ->
 15471                              <1> 	;          cf = 0 -> 
 15472                              <1> 	;		   AL = Current Drive number	
 15473                              <1> 	;		   AH = The Last Logical DOS Drive no.
 15474                              <1> 	;          cf = 1 -> Error code in AL
 15475                              <1> 	;
 15476                              <1> 	; Modified Registers: EAX (at the return of system call)
 15477                              <1> 	;
 15478                              <1> 	; NOTE: If the requested logical dos drive is ready, 
 15479                              <1> 	;	it's current current directory will be the user's
 15480                              <1> 	;	(program's) current directory.
 15481                              <1> 	;	(When the program is terminated, MainProg -internal 
 15482                              <1> 	;	shell- will reset the previous -current- logical drive
 15483                              <1> 	;       as current drive again).	
 15484                              <1>   
 15485 00011E1B 80FBFF              <1> 	cmp	bl, 0FFh
 15486 00011E1E 7435                <1> 	je	short sysdrive_ok
 15487 00011E20 3A1D[22380100]      <1> 	cmp	bl, [Last_DOS_DiskNo]
 15488 00011E26 771E                <1> 	ja	short sysdrive_err	
 15489                              <1> 
 15490                              <1> 	; Save current drive and reset mode
 15491                              <1> 	; for 'reset_working_path' procedure (for MainProg)
 15492 00011E28 30C0                <1> 	xor	al, al
 15493 00011E2A 66A3[488E0100]      <1> 	mov	[SWP_Mode], ax ; ah = 0
 15494 00011E30 A0[56820100]        <1> 	mov	al, [Current_Drv]
 15495 00011E35 FEC4                <1> 	inc	ah ; mov ah, 1
 15496 00011E37 66A3[4A8E0100]      <1> 	mov	[SWP_DRV], ax 
 15497                              <1> 
 15498 00011E3D 88DA                <1> 	mov	dl, bl
 15499 00011E3F E88A62FFFF          <1> 	call	change_current_drive
 15500 00011E44 730F                <1> 	jnc	short sysdrive_ok
 15501                              <1> sysdrive_err:
 15502 00011E46 C705[64030300]0F00- <1> 	mov	dword [u.r0], ERR_DRV_NOT_RDY ; 'drive not ready !'
 15502 00011E4E 0000                <1>
 15503 00011E50 E977BAFFFF          <1> 	jmp	error
 15504                              <1> sysdrive_ok:
 15505 00011E55 A0[56820100]        <1> 	mov	al, [Current_Drv]
 15506 00011E5A 8A25[22380100]      <1> 	mov	ah, [Last_DOS_DiskNo]
 15507 00011E60 A3[64030300]        <1> 	mov	[u.r0], eax
 15508 00011E65 E982BAFFFF          <1> 	jmp	sysret
 15509                              <1> 
 15510                              <1> 
 15511                              <1> sysdir: ; Get Current (Working) Drive & Directory (for user)
 15512                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15513                              <1> 	;	
 15514                              <1>         ; INPUT ->
 15515                              <1>         ;          EBX = Current directory name buffer address
 15516                              <1> 	;		(Buffer length = 92 bytes)
 15517                              <1> 	; OUTPUT ->
 15518                              <1> 	;          AL = Current drive (0=A: .. 2=C:)
 15519                              <1> 	;	   If CF = 1 -> AL = error code
 15520                              <1> 	;
 15521                              <1> 	; Modified Registers: EAX (at the return of system call)
 15522                              <1> 	;
 15523                              <1> 	; Note: Required directory name buffer length may be 
 15524                              <1> 	;	<= 92 bytes for current TRDOS 386 version.
 15525                              <1> 	;	(7*12 name chars + 7 slash + 0)
 15526                              <1> 
 15527 00011E6A 89E5                <1> 	mov	ebp, esp
 15528 00011E6C 83EC60              <1> 	sub	esp, 96
 15529 00011E6F 53                  <1> 	push	ebx ; User's buffer address
 15530 00011E70 30D2                <1> 	xor	dl, dl ; 0 = current drive
 15531 00011E72 E85391FFFF          <1>   	call	get_current_directory
 15532 00011E77 72CD                <1> 	jc	short sysdrive_err ; 'drive not ready !' error
 15533 00011E79 89E6                <1> 	mov	esi, esp ; System's buffer address
 15534 00011E7B 5F                  <1> 	pop	edi  ; User's buffer address
 15535                              <1> 	; ecx = transfer (byte) count (<=92)
 15536 00011E7C E843F4FFFF          <1> 	call	transfer_to_user_buffer
 15537 00011E81 89EC                <1> 	mov	esp, ebp
 15538 00011E83 730F                <1> 	jnc	short sysdir_ok
 15539                              <1> sysdir_err:
 15540 00011E85 C705[64030300]2E00- <1> 	mov	dword [u.r0], ERR_BUFFER  ; 'buffer error !'
 15540 00011E8D 0000                <1>
 15541 00011E8F E938BAFFFF          <1> 	jmp	error
 15542                              <1> sysdir_ok:	
 15543 00011E94 8A0D[56820100]      <1> 	mov	cl, [Current_Drv]
 15544 00011E9A 890D[64030300]      <1> 	mov	[u.r0], ecx
 15545 00011EA0 E947BAFFFF          <1> 	jmp	sysret
 15546                              <1> 
 15547                              <1> 
 15548                              <1> sysldrvt: ; Get copy of Logical DOS Drive Description Table
 15549                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15550                              <1> 	;	
 15551                              <1>         ; INPUT ->
 15552                              <1> 	;	    BL = Logical DOS drive number (zero based)	
 15553                              <1>         ;          ECX = Logical DOS drv desc table buffer addr
 15554                              <1> 	;		(Buffer length = 256 bytes)
 15555                              <1> 	; OUTPUT ->
 15556                              <1> 	;          cf = 0 -> 
 15557                              <1> 	;		   AL = Current Drive number	
 15558                              <1> 	;		   AH = The Last Logical DOS Drive no.
 15559                              <1> 	;          cf = 1 -> Error code in AL
 15560                              <1> 	;		   AH = The Last Logical DOS Drive no.
 15561                              <1> 	;
 15562                              <1> 	; Modified Registers: EAX (at the return of system call)
 15563                              <1> 	;
 15564                              <1> 	; Note: Required description table buffer length is
 15565                              <1> 	;	256 bytes for current TRDOS 386 version.
 15566                              <1> 	
 15567 00011EA5 89CF                <1> 	mov	edi, ecx ; Destination address (user space)
 15568 00011EA7 88DC                <1> 	mov	ah, bl
 15569 00011EA9 30C0                <1> 	xor	al, al
 15570 00011EAB BE00010900          <1> 	mov	esi, Logical_DOSDisks
 15571 00011EB0 01C6                <1> 	add	esi, eax ; Source address (system space)	 
 15572 00011EB2 B900010000          <1> 	mov	ecx, 256 ; Byte count 
 15573                              <1> 			 ; Logical Dos Drv Desc Table size
 15574 00011EB7 E808F4FFFF          <1> 	call	transfer_to_user_buffer
 15575 00011EBC 72C7                <1> 	jc	short sysdir_err
 15576 00011EBE 8A2D[22380100]      <1> 	mov	ch, [Last_DOS_DiskNo]
 15577 00011EC4 EBCE                <1> 	jmp	short sysdir_ok
 15578                              <1> 
 15579                              <1> 
 15580                              <1> systime: ; Get System Date&Time
 15581                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15582                              <1> 	;	
 15583                              <1>         ; INPUT -> BL =
 15584                              <1> 	;	    0 = Get Date&Time in Unix/Epoch format
 15585                              <1> 	;	    1 = Get Time in MSDOS format
 15586                              <1> 	;	    2 = Get Date in MSDOS format
 15587                              <1> 	;	    3 = Get Date&Time in MSDOS format
 15588                              <1> 	;	    4 & other values =
 15589                              <1> 	;		System timer ticks will be returned
 15590                              <1> 	;		in EAX and Carry Flag will be set.
 15591                              <1> 	;		(CF will not be set if BL = 4)	 	
 15592                              <1> 	; OUTPUT ->
 15593                              <1> 	;	For BL input = 3
 15594                              <1> 	;          EAX = Current Time (RTC)
 15595                              <1> 	;		AL = Second (DL in MSDOS)
 15596                              <1> 	;		AH = Minute (CL in MSDOS)
 15597                              <1> 	;	   	HW of EAX = Hour (CH in MSDOS)	
 15598                              <1> 	;	   EDX = Current System Date (RTC)
 15599                              <1> 	;		DL = Day (DL in MSDOS)
 15600                              <1> 	;		DH = Month (DH in MSDOS)
 15601                              <1> 	;		HW of EDX = Year (CX in MSDOS)	
 15602                              <1> 	;
 15603                              <1> 	;	For BL input = 2
 15604                              <1> 	;	   EAX = Current System Date (RTC)
 15605                              <1> 	;		DL = Day (DL in MSDOS)
 15606                              <1> 	;		DH = Month (DH in MSDOS)
 15607                              <1> 	;		HW of EDX = Year (CX in MSDOS)
 15608                              <1> 	;
 15609                              <1> 	;	For BL input = 1
 15610                              <1> 	;          EAX = Current Time (RTC)
 15611                              <1> 	;		AL = Second (DL in MSDOS)
 15612                              <1> 	;		AH = Minute (CL in MSDOS)
 15613                              <1> 	;	   	HW of EAX = Hour (CH in MSDOS)	
 15614                              <1> 	;
 15615                              <1> 	;	For BL input = 0
 15616                              <1> 	;          EAX = Unix (Epoch) Time Ticks/Seconds
 15617                              <1> 	;
 15618                              <1> 	;	For BL input  = 4
 15619                              <1> 	;	   EAX = System timer ticks
 15620                              <1> 	;
 15621                              <1> 	;	If CF = 1 (for other values of BL input)
 15622                              <1> 	;	   EAX = System timer ticks (no error code!)	
 15623                              <1> 	;		
 15624                              <1> 	; Modified Registers: EAX, (EDX)
 15625                              <1> 	;		 (at the return of system call)
 15626                              <1> 	;
 15627                              <1> 
 15628 00011EC6 20DB                <1> 	and	bl, bl
 15629 00011EC8 750F                <1> 	jnz	short systime_1
 15630 00011ECA E8EF57FFFF          <1> 	call	epoch
 15631                              <1> systime_0:
 15632 00011ECF A3[64030300]        <1> 	mov	[u.r0], eax
 15633 00011ED4 E913BAFFFF          <1> 	jmp	sysret
 15634                              <1> systime_1:
 15635 00011ED9 80FB04              <1> 	cmp	bl, 4
 15636 00011EDC 7211                <1> 	jb	short systime_2
 15637 00011EDE A1[10820100]        <1> 	mov	eax, [TIMER_LH] ; 18.2 Hz timer ticks
 15638                              <1> 				; Note: [TIMER_LH] may be set
 15639                              <1> 				; to wrong timer value due to
 15640                              <1> 				; program functions.
 15641                              <1> 				; (This value must not be
 15642                              <1> 				; accepted as [TIMER_LH]/18.2
 15643                              <1> 				; seconds since the midnight.)
 15644 00011EE3 76EA                <1> 	jna	short systime_0
 15645 00011EE5 A3[64030300]        <1> 	mov	[u.r0], eax	
 15646 00011EEA E9DDB9FFFF          <1> 	jmp	error ; cf = 1 & [u.r0] = eax = timer ticks 
 15647                              <1> 
 15648                              <1> systime_2:
 15649                              <1> 	;push	ebx
 15650 00011EEF E82C57FFFF          <1> 	call	get_rtc_date_time
 15651                              <1> 	;pop	ebx
 15652 00011EF4 F6C301              <1> 	test	bl, 1
 15653 00011EF7 7429                <1> 	jz	short systime_4
 15654 00011EF9 30E4                <1> 	xor	ah, ah
 15655 00011EFB A0[5E7E0100]        <1> 	mov	al, [hour]
 15656 00011F00 88C2                <1> 	mov	dl, al
 15657 00011F02 C1E010              <1> 	shl	eax, 16
 15658 00011F05 A0[627E0100]        <1> 	mov	al, [second]
 15659 00011F0A 8A25[607E0100]      <1> 	mov	ah, [minute]
 15660 00011F10 F6C302              <1> 	test	bl, 2
 15661 00011F13 74BA                <1> 	jz	short systime_0
 15662                              <1> 	; Check time & date match risk 
 15663                              <1> 	; (23:59:59 may cause to wrong
 15664                              <1> 	; date -new day with previous date-...)
 15665 00011F15 80FA17              <1> 	cmp	dl, 23
 15666 00011F18 7206                <1> 	jb	short systime_3
 15667 00011F1A 663D3B3B            <1> 	cmp	ax, (59*256)+59 ; if hour is 23:59:59
 15668 00011F1E 73CF                <1> 	jnb	short systime_2 ; wait for 1 second
 15669                              <1> systime_3:
 15670                              <1> 	; eax = time
 15671 00011F20 89C6                <1> 	mov	esi, eax
 15672                              <1> systime_4:	
 15673 00011F22 66A1[587E0100]      <1> 	mov	ax, [year]
 15674 00011F28 C1E010              <1> 	shl	eax, 16
 15675 00011F2B A0[5C7E0100]        <1> 	mov	al, [day]
 15676 00011F30 8A25[5A7E0100]      <1> 	mov	ah, [month]
 15677                              <1> 	; eax = date
 15678 00011F36 80E301              <1> 	and	bl, 1
 15679 00011F39 7494                <1> 	jz	short systime_0
 15680 00011F3B 96                  <1> 	xchg	esi, eax
 15681                              <1> 	; eax = time, esi = date
 15682 00011F3C 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; EBP points to user's registers
 15683                              <1> 	; (user) edx <-- (system) esi
 15684 00011F42 897514              <1> 	mov	[ebp+20], esi ; return to user with EDX value 
 15685 00011F45 EB88                <1> 	jmp	short systime_0
 15686                              <1> 
 15687                              <1> 
 15688                              <1> sysstime: ; Set System Date&Time
 15689                              <1> 	; 31/12/2017
 15690                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15691                              <1> 	;	
 15692                              <1>         ; INPUT -> BL =
 15693                              <1> 	;	    0 = Set Date&Time in Unix/Epoch format
 15694                              <1> 	;	    1 = Set Time in MSDOS format
 15695                              <1> 	;	    2 = Set Date in MSDOS format
 15696                              <1> 	;	    3 = Set Date&Time in MSDOS format
 15697                              <1> 	;	    4 = Set System Timer (Ticks)
 15698                              <1> 	;	    5 = Convert/Save current time to/as
 15699                              <1> 	;		18.2 Hz system timer ticks
 15700                              <1> 	;	    6 = Convert MSDOS Date&Time to UNIX format
 15701                              <1> 	;		without setting system date&time ; (test)
 15702                              <1> 	;	    7 = Convert UNIX Date&Time to MSDOS format
 15703                              <1> 	;		without setting system date&time ; (test)
 15704                              <1> 	;	   8-0FFh = invalid !
 15705                              <1> 	;	  ECX = Time (or Timer) value in selected format  	
 15706                              <1> 	;	  EDX = Date value in MSDOS format if BL=2,3,6	
 15707                              <1> 	; 	
 15708                              <1> 	; OUTPUT ->
 15709                              <1> 	;	If CF = 0 ->
 15710                              <1> 	;          EAX = Set value
 15711                              <1> 	;	If CF = 1 -> (invalid BL input)
 15712                              <1> 	;	   EAX = Ticks count [TIMER_LH]	
 15713                              <1> 	;
 15714                              <1> 
 15715 00011F47 20DB                <1> 	and	bl, bl ; 0
 15716 00011F49 7511                <1> 	jnz	short sysstime_0
 15717 00011F4B 89C8                <1> 	mov	eax, ecx
 15718 00011F4D E8F657FFFF          <1> 	call	convert_from_epoch
 15719 00011F52 E8A258FFFF          <1> 	call	set_rtc_date_time
 15720 00011F57 E990B9FFFF          <1> 	jmp	sysret
 15721                              <1> sysstime_0:
 15722 00011F5C 80FB08              <1> 	cmp	bl, 8
 15723 00011F5F 722D                <1> 	jb	short sysstime_1
 15724                              <1> 	; invalid input (>7)
 15725 00011F61 A1[10820100]        <1> 	mov	eax, [TIMER_LH] ; 18.2 Hz timer ticks
 15726                              <1> 				; Note: [TIMER_LH] may be set
 15727                              <1> 				; to wrong timer value due to
 15728                              <1> 				; program functions.
 15729                              <1> 				; (This value must not be
 15730                              <1> 				; accepted as [TIMER_LH]/18.2
 15731                              <1> 				; seconds since the midnight.)
 15732 00011F66 A3[64030300]        <1> 	mov	[u.r0], eax	
 15733 00011F6B E95CB9FFFF          <1> 	jmp	error ; cf = 1 & [u.r0] = eax = timer ticks 
 15734                              <1> 
 15735                              <1> sysstime_8:	
 15736                              <1> 	; BL = 7
 15737 00011F70 89C8                <1> 	mov	eax, ecx ; seconds since 1/1/1970 00:00:00
 15738 00011F72 E8D157FFFF          <1> 	call	convert_from_epoch
 15739 00011F77 30E4                <1> 	xor	ah, ah
 15740 00011F79 A0[5E7E0100]        <1> 	mov	al, [hour]
 15741 00011F7E C1E010              <1> 	shl	eax, 16
 15742 00011F81 A0[627E0100]        <1> 	mov	al, [second]
 15743 00011F86 8A25[607E0100]      <1> 	mov	ah, [minute]
 15744 00011F8C EB92                <1> 	jmp	short systime_3
 15745                              <1> 
 15746                              <1> sysstime_1:
 15747 00011F8E 80FB04              <1> 	cmp	bl, 4
 15748 00011F91 743F                <1> 	je	short sysstime_2 ; set system timer ticks	
 15749 00011F93 80FB05              <1> 	cmp	bl, 5
 15750 00011F96 754B                <1> 	jne	short sysstime_4
 15751                              <1> 	; convert current time to system timer ticks (18.2Hz)
 15752 00011F98 E88356FFFF          <1> 	call	get_rtc_date_time
 15753 00011F9D 0FB60D[5E7E0100]    <1> 	movzx	ecx, byte [hour]
 15754 00011FA4 B8100E0000          <1> 	mov	eax, 60*60 ; 1 hour = 3600 seconds
 15755 00011FA9 F7E1                <1> 	mul	ecx
 15756 00011FAB 89C3                <1> 	mov	ebx, eax	
 15757 00011FAD B13C                <1> 	mov	cl, 60  ; 1 minute = 60 seconds
 15758 00011FAF 0FB605[607E0100]    <1> 	movzx	eax, byte [minute]
 15759 00011FB6 F7E1                <1> 	mul	ecx
 15760 00011FB8 01D8                <1> 	add	eax, ebx  
 15761 00011FBA 8A0D[627E0100]      <1> 	mov	cl, [second]
 15762 00011FC0 01C8                <1> 	add	eax, ecx
 15763 00011FC2 B1B6                <1> 	mov	cl, 182
 15764 00011FC4 F7E1                <1> 	mul	ecx
 15765 00011FC6 83C009              <1> 	add	eax, 9
 15766 00011FC9 83D200              <1> 	adc	edx, 0
 15767 00011FCC B10A                <1> 	mov	cl, 10
 15768 00011FCE F7F1                <1> 	div	ecx
 15769                              <1> 	; eax = ((182*seconds)+9)/10
 15770 00011FD0 89C1                <1> 	mov	ecx, eax
 15771                              <1> sysstime_2:
 15772 00011FD2 890D[10820100]      <1> 	mov	[TIMER_LH], ecx ; 18.2 * seconds
 15773                              <1> sysstime_3:
 15774 00011FD8 890D[64030300]      <1> 	mov	[u.r0], ecx
 15775 00011FDE E909B9FFFF          <1> 	jmp	sysret
 15776                              <1> sysstime_4:
 15777 00011FE3 80FB06              <1> 	cmp	bl, 6
 15778 00011FE6 7788                <1> 	ja	short sysstime_8
 15779                              <1> 
 15780 00011FE8 890D[64030300]      <1> 	mov	[u.r0], ecx
 15781                              <1> 
 15782 00011FEE 880D[627E0100]      <1> 	mov	[second], cl
 15783 00011FF4 882D[607E0100]      <1> 	mov	[minute], ch
 15784 00011FFA C1E910              <1> 	shr	ecx, 16
 15785 00011FFD 880D[5E7E0100]      <1> 	mov	[hour], cl
 15786                              <1> 	; BL = 1,2,3,6
 15787 00012003 80FB01              <1> 	cmp	bl, 1
 15788 00012006 762A                <1> 	jna	short sysstime_5
 15789                              <1> 	; BL = 2,3,6
 15790 00012008 8815[5C7E0100]      <1> 	mov	[day], dl
 15791 0001200E 8835[5A7E0100]      <1> 	mov	[month], dh
 15792 00012014 C1EA10              <1> 	shr	edx, 16
 15793 00012017 668915[587E0100]    <1> 	mov	[year], dx
 15794 0001201E 80E303              <1> 	and	bl, 3
 15795 00012021 742D                <1> 	jz	short sysstime_7 ; 6
 15796                              <1> 	; BL = 2,3
 15797 00012023 F6C301              <1> 	test	bl, 1
 15798 00012026 7419                <1> 	jz	short sysstime_6 ; 2
 15799                              <1> 	; BL = 3
 15800 00012028 E8CC57FFFF          <1> 	call	set_rtc_date_time
 15801 0001202D E9BAB8FFFF          <1> 	jmp	sysret
 15802                              <1> sysstime_5:
 15803                              <1> 	; BL = 1
 15804 00012032 E80358FFFF          <1> 	call	set_time_bcd
 15805 00012037 E8934AFFFF          <1> 	call	set_rtc_time
 15806 0001203C E9ABB8FFFF          <1> 	jmp	sysret	
 15807                              <1> sysstime_6:
 15808                              <1> 	; BL = 2
 15809 00012041 E8C757FFFF          <1> 	call	set_date_bcd
 15810 00012046 E8F34AFFFF          <1> 	call	set_rtc_date
 15811 0001204B E99CB8FFFF          <1> 	jmp	sysret
 15812                              <1> sysstime_7:
 15813                              <1> 	; BL = 6
 15814                              <1> 	; [year], [month], [day], 
 15815                              <1> 	; [hour], [minute], [second]
 15816 00012050 E86E56FFFF          <1> 	call	convert_to_epoch
 15817 00012055 89C1                <1> 	mov	ecx, eax ; seconds since 1/1/1970 00:00:00
 15818 00012057 E97CFFFFFF          <1> 	jmp	sysstime_3
 15819                              <1> 
 15820                              <1> sysrename: ; Rename File (or Directory)
 15821                              <1> 	; 19/01/2021
 15822                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15823                              <1> 	;	
 15824                              <1>         ; INPUT ->
 15825                              <1>         ;          EBX = File/Directory (ASCIIZ) name address
 15826                              <1> 	;	   ECX = New name (in same dir, no path name)			
 15827                              <1> 	; OUTPUT ->
 15828                              <1> 	;          cf = 0 -> EAX = 0
 15829                              <1> 	;          cf = 1 -> Error code in AL
 15830                              <1> 
 15831                              <1> 	; 19/01/2021
 15832 0001205C 803D[B0030300]00    <1> 	cmp	byte [u.uid], 0  ; root (super user) ?
 15833 00012063 7614                <1> 	jna	short sysrename_0
 15834                              <1> 
 15835                              <1> sysrename_perm_err:
 15836                              <1> 	;mov	dword [u.r0], ERR_PERM_DENIED
 15837 00012065 B80B000000          <1> 	mov	eax, ERR_PERM_DENIED ; 'permission denied !'
 15838 0001206A A3[64030300]        <1> 	mov	[u.r0], eax
 15839 0001206F A3[C8030300]        <1> 	mov	[u.error], eax
 15840 00012074 E953B8FFFF          <1> 	jmp	error
 15841                              <1> 
 15842                              <1> sysrename_0:
 15843 00012079 51                  <1> 	push	ecx ; new file name address (in user space)
 15844 0001207A 89DE                <1> 	mov	esi, ebx
 15845                              <1> 	; file name is forced, change directory as temporary
 15846                              <1> 	;mov	ax, 1
 15847                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset
 15848                              <1> 	;call	set_working_path 
 15849 0001207C E8BF060000          <1> 	call	set_working_path_x
 15850 00012081 731E                <1> 	jnc	short sysrename_1
 15851 00012083 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
 15852 00012085 7505                <1> 	jnz	short sysrename_err
 15853                              <1> 	; eax = 0
 15854                              <1> sysrename_path_not_found:
 15855 00012087 B813000000          <1> 	mov	eax, ERR_INV_PATH_NAME ; 'Bad path name !'
 15856                              <1> sysrename_err:
 15857 0001208C 59                  <1> 	pop	ecx ; new file name address (in user space)
 15858                              <1> sysrename_error:
 15859 0001208D A3[64030300]        <1> 	mov	[u.r0], eax
 15860 00012092 A3[C8030300]        <1> 	mov	[u.error], eax
 15861 00012097 E879070000          <1> 	call 	reset_working_path
 15862 0001209C E92BB8FFFF          <1> 	jmp	error
 15863                              <1> sysrename_1:
 15864 000120A1 B008                <1> 	mov	al, 08h ; Except volume labels (& long names)
 15865 000120A3 A0[0C8C0100]        <1> 	mov	al, [Attributes]
 15866 000120A8 2410                <1> 	and	al, 10h ;
 15867                              <1> 	;mov	esi, FindFile_Name
 15868                              <1> 	;mov	ax, 1800h ; Only files
 15869                              <1> 	;mov	ax, 0810h ; Only directories
 15870 000120AA 66B80008            <1> 	mov	ax, 0800h ; Find File or Directory
 15871 000120AE E8BE73FFFF          <1> 	call	find_first_file
 15872                              <1> 	;jnc	short sysrename_2
 15873 000120B3 72D7                <1> 	jc	short sysrename_err
 15874                              <1> sysrename_2:
 15875                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
 15876                              <1> 	; EDI = Directory Buffer Directory Entry Location
 15877                              <1> 	; EAX = File Size
 15878                              <1> 	;  BL = Attributes of The File/Directory
 15879                              <1> 	;  BH = Long Name Yes/No Status (>0 is YES)
 15880                              <1> 	;  DX > 0 : Ambiguous filename chars are used
 15881                              <1> 
 15882 000120B5 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
 15883 000120B8 7407                <1> 	jz	short sysrename_3
 15884 000120BA B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME ; 'invalid file name !'
 15885 000120BF EBCB                <1>         jmp	short sysrename_err
 15886                              <1> sysrename_3:
 15887                              <1> 	; EDI = Directory buffer entry offset/address
 15888                              <1> 	; BL = File (or Directory) Attributes 
 15889                              <1> 	; mov	bl, [EDI+0Bh]
 15890                              <1> 
 15891 000120C1 5A                  <1> 	pop	edx ; new file name address (in user space)
 15892                              <1> 
 15893                              <1> 	; check file/directory attributes
 15894 000120C2 F6C307              <1> 	test	bl, 7 ; system, hidden, readonly 
 15895 000120C5 759E                <1>         jnz	short sysrename_perm_err
 15896                              <1> sysrename_4:
 15897 000120C7 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h ; Singlix FS
 15898 000120CD 7496                <1> 	je	short sysrename_perm_err ; -temporary!-
 15899                              <1> 
 15900                              <1> 	; save old file name & file info (FFF structure)
 15901 000120CF BE[F68A0100]        <1> 	mov	esi, FindFile_Drv
 15902 000120D4 BF[3C8C0100]        <1> 	mov	edi, SourceFile_Drv
 15903 000120D9 B920000000          <1> 	mov	ecx, 128/4
 15904 000120DE F3A5                <1> 	rep	movsd
 15905                              <1> 
 15906 000120E0 89D6                <1> 	mov	esi, edx ; new file name address (in user space)
 15907 000120E2 BF[BC8C0100]        <1> 	mov	edi, DestinationFile_Drv
 15908 000120E7 E85695FFFF          <1> 	call	parse_path_name
 15909 000120EC 729F                <1> 	jc	short sysrename_error ; eax = 1 (Bad file name)
 15910                              <1> 
 15911                              <1> 	; same drive ? 
 15912 000120EE A0[F68A0100]        <1> 	mov	al, [FindFile_Drv]
 15913 000120F3 3A05[BC8C0100]      <1> 	cmp	al, [DestinationFile_Drv]
 15914                              <1> 	;jne	short sysrename_perm_err ; Permission denied
 15915 000120F9 7509                <1> 	jne	short sysrename_5 ; Bad file name
 15916                              <1>  
 15917                              <1> 	; no path name !? (rename file in same directory)
 15918 000120FB 803D[BD8C0100]20    <1> 	cmp	byte [DestinationFile_Directory], 20h
 15919 00012102 7607                <1> 	jna	short sysrename_6
 15920                              <1> sysrename_5:
 15921 00012104 B801000000          <1> 	mov	eax, ERR_BAD_CMD_ARG ; 1 = Bad file name 
 15922                              <1> 				     ; (Bad argument)
 15923 00012109 EB82                <1> 	jmp	short sysrename_error
 15924                              <1> sysrename_6:
 15925 0001210B 803D[FE8C0100]20    <1> 	cmp	byte [DestinationFile_Name], 20h
 15926 00012112 76F0                <1> 	jna	short sysrename_5
 15927                              <1> 
 15928 00012114 BE[FE8C0100]        <1> 	mov	esi, DestinationFile_Name
 15929 00012119 E81177FFFF          <1> 	call	check_filename ; is it a valid msdos file name?
 15930 0001211E 0F8269FFFFFF        <1> 	jc	sysrename_error ; 26 = ERR_INV_FILE_NAME 
 15931                              <1> 	
 15932                              <1> 	;mov	esi, DestinationFile_Name
 15933 00012124 66B80008            <1> 	mov	ax, 0800h ; Find File or Directory
 15934 00012128 E84473FFFF          <1> 	call	find_first_file
 15935 0001212D 720A                <1> 	jc	short sysrename_7
 15936                              <1> 	
 15937 0001212F B80E000000          <1> 	mov	eax, ERR_FILE_EXISTS  ; file already exists !
 15938 00012134 E954FFFFFF          <1> 	jmp	sysrename_error	
 15939                              <1> sysrename_7:
 15940                              <1> 	; eax = 2 (File not found !)
 15941 00012139 3C02                <1> 	cmp	al, 2 ; ERR_NOT_FOUND
 15942 0001213B 0F854CFFFFFF        <1> 	jne	sysrename_error
 15943                              <1> 
 15944                              <1> 	; 31/12/2017
 15945                              <1> 	; Following code is also part of 'rename_file' in
 15946                              <1> 	; 'trdosk3.s' (MainProg's 'rename' command) ; 13/11/2017
 15947 00012141 BE[FE8C0100]        <1> 	mov	esi, DestinationFile_Name ; (Rename_NewName)
 15948 00012146 668B0D[B68C0100]    <1> 	mov	cx, [SourceFile_DirEntryNumber] 
 15949 0001214D 66A1[A28C0100]      <1> 	mov	ax, [SourceFile_DirEntry+20] ; First Cluster, HW 
 15950 00012153 C1E010              <1> 	shl	eax, 16
 15951 00012156 66A1[A88C0100]      <1> 	mov	ax, [SourceFile_DirEntry+26] ; First Cluster, LW 
 15952 0001215C 0FB61D[8B8C0100]    <1>   	movzx	ebx, byte [SourceFile_LongNameEntryLength]  
 15953 00012163 E8229DFFFF          <1>    	call	rename_directory_entry
 15954 00012168 0F821FFFFFFF        <1> 	jc	sysrename_error
 15955                              <1> 	;xor	eax, eax
 15956 0001216E A3[64030300]        <1> 	mov	[u.r0], eax ; 0
 15957                              <1> 	;mov	[u.error], eax
 15958 00012173 E89D060000          <1> 	call 	reset_working_path
 15959 00012178 E96FB7FFFF          <1> 	jmp	sysret
 15960                              <1> 
 15961                              <1> sysmem: ; Get Total&Free Memory amount 
 15962                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15963                              <1> 	;	
 15964                              <1>         ; INPUT -> 
 15965                              <1> 	;	none	
 15966                              <1> 	; OUTPUT ->
 15967                              <1> 	;	EAX = Total memory count (in bytes)
 15968                              <1> 	;	EBX = Virtually available memory amount (in bytes)
 15969                              <1> 	;	      = 4GB - CORE (4MB)	
 15970                              <1> 	;	ECX = Free memory count (in bytes)
 15971                              <1> 	;	EDX = Calculated free memory count (in bytes)
 15972                              <1> 	
 15973 0001217D A1[94810100]        <1> 	mov	eax, [memory_size] ; in pages
 15974 00012182 C1E00C              <1> 	shl	eax, 12		   ; in bytes
 15975 00012185 A3[64030300]        <1> 	mov	[u.r0], eax
 15976 0001218A E8B421FFFF          <1> 	call	calc_free_mem
 15977                              <1> 	; edx = calculated free pages
 15978                              <1> 	; ecx = 0
 15979 0001218F 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; EBP points to user's registers
 15980 00012195 C745100000C0FF      <1> 	mov	dword [ebp+16], ECORE ; EBX (for user)
 15981                              <1> 				; 0FFC00000h ; 4GB - 4MB
 15982 0001219C C1E20C              <1> 	shl	edx, 12
 15983 0001219F 895514              <1> 	mov	[ebp+20], edx ; EDX (for user)
 15984 000121A2 8B0D[98810100]      <1> 	mov 	ecx, [free_pages]
 15985 000121A8 C1E10C              <1> 	shl	ecx, 12	; free bytes
 15986 000121AB 894D18              <1> 	mov	[ebp+24], ecx ; ECX (for user)
 15987                              <1> 	;mov	[free_pages], edx	
 15988 000121AE E939B7FFFF          <1> 	jmp	sysret
 15989                              <1> 
 15990                              <1> sysprompt:
 15991                              <1> 	; Set TRDOS 386 Command Interpreter (MainProg) prompt 
 15992                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0) 
 15993                              <1> 	;	
 15994                              <1>         ; INPUT -> 
 15995                              <1> 	;	EBX = 0 -> use default prompt
 15996                              <1> 	;	EBX > 0 -> prompt string (ASCIIZ) address
 15997                              <1> 	;		  (Max. 11 characters except ZERO tail)	
 15998                              <1> 	; OUTPUT ->
 15999                              <1> 	;	(EAX = 0)
 16000                              <1> 	;	CF = 0 -> Successful
 16001                              <1> 	;	CF = 1 -> Failed
 16002                              <1> 
 16003 000121B3 21DB                <1> 	and	ebx, ebx
 16004 000121B5 750A                <1> 	jnz	short sysprompt_0
 16005                              <1> 
 16006 000121B7 E8B96CFFFF          <1> 	call	default_command_prompt ; '['+'TRDOS'+']'
 16007 000121BC E92BB7FFFF          <1> 	jmp	sysret
 16008                              <1> 
 16009                              <1> sysprompt_0:
 16010 000121C1 31C0                <1> 	xor	eax, eax
 16011 000121C3 A3[64030300]        <1> 	mov	[u.r0], eax 
 16012 000121C8 89DE                <1> 	mov	esi, ebx
 16013 000121CA B90C000000          <1> 	mov	ecx, 12
 16014 000121CF 89E5                <1> 	mov	ebp, esp
 16015 000121D1 29CC                <1> 	sub	esp, ecx
 16016 000121D3 49                  <1> 	dec	ecx ; 11
 16017 000121D4 89E7                <1> 	mov	edi, esp
 16018 000121D6 E833F1FFFF          <1> 	call	transfer_from_user_buffer
 16019 000121DB 7211                <1> 	jc	short sysprompt_err
 16020 000121DD 803E20              <1> 	cmp	byte [esi], 20h
 16021 000121E0 760C                <1> 	jna	short sysprompt_err
 16022 000121E2 E8A06CFFFF          <1> 	call	set_command_prompt
 16023 000121E7 89EC                <1> 	mov	esp, ebp
 16024 000121E9 E9FEB6FFFF          <1> 	jmp	sysret
 16025                              <1> sysprompt_err:
 16026                              <1> syspath_err:
 16027 000121EE 89EC                <1> 	mov	esp, ebp
 16028 000121F0 E9D7B6FFFF          <1> 	jmp	error
 16029                              <1> 
 16030                              <1> syspath:
 16031                              <1> 	; Get/Set Run Path
 16032                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0) 
 16033                              <1> 	;	
 16034                              <1>         ; INPUT -> 
 16035                              <1> 	;	EBX = 0 -> get path (to buffer address in ECX)
 16036                              <1> 	;	EBX > 0 -> set path
 16037                              <1> 	;	    EBX = Path string buffer address (ASCIIZ)
 16038                              <1> 	;	    	  (Path description except 'PATH=')
 16039                              <1> 	;	ECX = Buffer address (if EBX = 0)
 16040                              <1> 	;	      (ECX will not be used if EBX > 0)	
 16041                              <1> 	;	DL = Buffer size (0 = 256 byte)	
 16042                              <1> 	;
 16043                              <1> 	; OUTPUT ->
 16044                              <1> 	;	CF = 0 -> Successful (EAX = String length)
 16045                              <1> 	;	CF = 1 -> Failed (EAX = 0)
 16046                              <1> 	;
 16047                              <1> 	; NOTE: 'PATH=' or 'PATH' must be excluded
 16048                              <1> 	;  (It must not be at the beginning of the string.)
 16049                              <1> 
 16050 000121F5 89E5                <1> 	mov	ebp, esp
 16051 000121F7 81EC00010000        <1> 	sub	esp, 256
 16052 000121FD 89E7                <1> 	mov	edi, esp
 16053                              <1> 
 16054 000121FF 31C0                <1> 	xor	eax, eax
 16055 00012201 A3[64030300]        <1> 	mov	[u.r0], eax 
 16056                              <1> 	
 16057 00012206 21DB                <1> 	and	ebx, ebx
 16058 00012208 752E                <1> 	jnz	short syspath_0
 16059                              <1> 
 16060                              <1> 	; EBX = 0 -> get run path
 16061 0001220A 89CB                <1> 	mov	ebx, ecx ; buffer addr (in user's mem space)
 16062 0001220C BE[EF380100]        <1> 	mov	esi, Cmd_Path  ; 'PATH' address
 16063 00012211 0FB6CA              <1> 	movzx	ecx, dl
 16064 00012214 80E901              <1> 	sub	cl, 1 ; 0 -> 255, 1 -> 0
 16065 00012217 6683D101            <1> 	adc	cx, 1 ; 255 -> 256, 0 -> 1
 16066                              <1> 	; EDI = Output buffer 
 16067                              <1> 	; CX = Buffer length
 16068                              <1> 	; AL = 0 -> use ASCIIZ word in [ESI]
 16069                              <1> 	; ESI = 'PATH' address (with zero tail)
 16070 0001221B E89B84FFFF          <1> 	call	get_environment_string
 16071 00012220 72CC                <1> 	jc	short syspath_err
 16072 00012222 89DF                <1> 	mov	edi, ebx ; User's buffer address
 16073 00012224 89E6                <1> 	mov	esi, esp 
 16074                              <1> 	; EDI = User's buffer address
 16075                              <1> 	; ECX = transfer (byte) count
 16076 00012226 E899F0FFFF          <1> 	call	transfer_to_user_buffer
 16077 0001222B 72C1                <1> 	jc	short syspath_err
 16078 0001222D 890D[64030300]      <1> 	mov	[u.r0], ecx 
 16079 00012233 E9B4B6FFFF          <1> 	jmp	sysret
 16080                              <1> 
 16081                              <1> syspath_0:
 16082 00012238 89DE                <1> 	mov	esi, ebx
 16083 0001223A 0FB6CA              <1> 	movzx	ecx, dl
 16084 0001223D 80E901              <1> 	sub	cl, 1 ; 0 -> 255, 1 -> 0
 16085 00012240 6683D101            <1> 	adc	cx, 1 ; 255 -> 256, 0 -> 1
 16086 00012244 E8C5F0FFFF          <1> 	call	transfer_from_user_buffer
 16087 00012249 72A3                <1> 	jc	short syspath_err
 16088                              <1> 	;(*) 'PATH=' will be added to 
 16089                              <1> 	;         the head of the string
 16090 0001224B 83EC08              <1> 	sub	esp, 8 ;(*)
 16091 0001224E 89FE                <1> 	mov	esi, edi ;(*)
 16092 00012250 E84A84FFFF          <1> 	call	set_path_x ;(*)
 16093 00012255 7297                <1> 	jc	short syspath_err
 16094 00012257 8915[64030300]      <1> 	mov	[u.r0], edx ; run path string length
 16095 0001225D E98AB6FFFF          <1> 	jmp	sysret	
 16096                              <1> 
 16097                              <1> sysenv:
 16098                              <1> 	; Get/Set Environment Variables
 16099                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0) 
 16100                              <1> 	;	
 16101                              <1>         ; INPUT -> 
 16102                              <1> 	;	EBX = 0 -> get (all) environment variables
 16103                              <1> 	;	      (Required Buffer length = 512 bytes)
 16104                              <1> 	;	EBX > 0 -> set (one) environment variable
 16105                              <1> 	;	      (If there is not a '=' after
 16106                              <1> 	;	      the environment variable name, it will
 16107                              <1> 	;	      accepted as 'get environment variable'.) 
 16108                              <1> 	;	       EBX = Buffer address
 16109                              <1> 	;	ECX = Buffer address (if EBX = 0)
 16110                              <1> 	;	      (ECX will not be used if EBX > 0)	
 16111                              <1> 	;	      (Note: Buffer size is 512 bytes.)	
 16112                              <1> 	;	DL = Buffer size (0 = 256 byte)
 16113                              <1> 	;	     (For one envrionment variable)		
 16114                              <1> 	;
 16115                              <1> 	; OUTPUT ->
 16116                              <1> 	;	(EAX = 0)
 16117                              <1> 	;	CF = 0 -> Successful (EAX = String length)
 16118                              <1> 	;	CF = 1 -> Failed (EAX = 0)
 16119                              <1> 	;
 16120                              <1> 	; Note: Environment variable name, for example,
 16121                              <1> 	;	'PATH=' must be included at the beginning
 16122                              <1> 	;	of the environment string. If the variable
 16123                              <1> 	;	name is as 'PATH' but it is not as 'PATH='
 16124                              <1> 	;	the variable string (row) will be returned.
 16125                              <1> 	;	If variable name is as 'PATH=' but there is
 16126                              <1> 	;	not a following text after the variable name,
 16127                              <1> 	;	the environment variable will be reset/deleted.
 16128                              <1> 
 16129 00012262 89E5                <1> 	mov	ebp, esp
 16130 00012264 81EC00020000        <1> 	sub	esp, 512
 16131 0001226A 89E7                <1> 	mov	edi, esp
 16132                              <1> 
 16133 0001226C 31C0                <1> 	xor	eax, eax
 16134 0001226E A3[64030300]        <1> 	mov	[u.r0], eax 
 16135                              <1> 	
 16136 00012273 21DB                <1> 	and	ebx, ebx
 16137 00012275 7524                <1> 	jnz	short sysenv_0
 16138                              <1> 
 16139                              <1> 	; EBX = 0 -> get (all) environment variables
 16140 00012277 89EC                <1> 	mov	esp, ebp
 16141 00012279 BE00300900          <1> 	mov	esi, Env_Page  ; Environment page
 16142 0001227E 89CF                <1> 	mov	edi, ecx ; buffer addr (in user's mem space)
 16143 00012280 B900020000          <1> 	mov	ecx, 512
 16144 00012285 E83AF0FFFF          <1> 	call	transfer_to_user_buffer
 16145 0001228A 0F823CB6FFFF        <1> 	jc	error
 16146 00012290 890D[64030300]      <1> 	mov	[u.r0], ecx 
 16147 00012296 E951B6FFFF          <1> 	jmp	sysret
 16148                              <1> 
 16149                              <1> sysenv_0:
 16150 0001229B 89DE                <1> 	mov	esi, ebx ; * ; user's buffer address
 16151 0001229D 0FB6CA              <1> 	movzx	ecx, dl
 16152 000122A0 80E901              <1> 	sub	cl, 1 ; 0 -> 255, 1 -> 0
 16153 000122A3 6683D101            <1> 	adc	cx, 1 ; 255 -> 256, 0 -> 1
 16154 000122A7 E862F0FFFF          <1> 	call	transfer_from_user_buffer
 16155 000122AC 723F                <1> 	jc	short sysenv_err
 16156 000122AE 89FE                <1> 	mov	esi, edi
 16157 000122B0 8A06                <1> 	mov	al, [esi]
 16158 000122B2 3C20                <1> 	cmp	al, 20h
 16159 000122B4 7637                <1> 	jna	short sysenv_err
 16160 000122B6 3C3D                <1> 	cmp	al, '='
 16161 000122B8 7433                <1> 	je	short sysenv_err
 16162 000122BA 56                  <1> 	push	esi
 16163                              <1> sysenv_1:
 16164 000122BB 46                  <1> 	inc	esi
 16165 000122BC 803E3D              <1> 	cmp	byte [esi], '='
 16166 000122BF 7433                <1> 	je	short sysenv_3
 16167 000122C1 803E20              <1> 	cmp	byte [esi], 20h
 16168 000122C4 73F5                <1> 	jnb	short sysenv_1
 16169 000122C6 C60600              <1> 	mov	byte [esi], 0 
 16170 000122C9 5E                  <1> 	pop	esi
 16171                              <1> 	; EDI = Output buffer 
 16172                              <1> 	; CX = Buffer length
 16173 000122CA 30C0                <1> 	xor	al, al
 16174                              <1> 	; AL = 0 -> use ASCIIZ word in [ESI]
 16175                              <1> 	; ESI = Environment variable name address
 16176 000122CC E8EA83FFFF          <1> 	call	get_environment_string
 16177 000122D1 721A                <1> 	jc	short sysenv_err
 16178 000122D3 89DF                <1> 	mov	edi, ebx ; * ; user's buffer address
 16179 000122D5 89C1                <1> 	mov	ecx, eax ; String length
 16180 000122D7 89E6                <1> 	mov	esi, esp 
 16181                              <1> 	; ESI = system buffer address
 16182                              <1> 	; EDI = User's buffer address
 16183                              <1> 	; ECX = transfer (byte) count
 16184 000122D9 E8E6EFFFFF          <1> 	call	transfer_to_user_buffer
 16185 000122DE 720D                <1> 	jc	short sysenv_err
 16186 000122E0 890D[64030300]      <1> 	mov	[u.r0], ecx ; transfer (byte) count
 16187                              <1> sysenv_2:
 16188 000122E6 89EC                <1> 	mov	esp, ebp
 16189 000122E8 E9FFB5FFFF          <1> 	jmp	sysret
 16190                              <1> sysenv_err:
 16191 000122ED 89EC                <1> 	mov	esp, ebp
 16192 000122EF E9D8B5FFFF          <1> 	jmp	error
 16193                              <1> sysenv_3:
 16194 000122F4 46                  <1> 	inc	esi
 16195 000122F5 803E20              <1> 	cmp	byte [esi], 20h
 16196 000122F8 73FA                <1> 	jnb	short sysenv_3
 16197 000122FA C60600              <1> 	mov	byte [esi], 0	
 16198 000122FD 5E                  <1> 	pop	esi
 16199 000122FE E87B84FFFF          <1> 	call	set_environment_string
 16200 00012303 72E8                <1> 	jc	short sysenv_err
 16201 00012305 8915[64030300]      <1> 	mov	[u.r0], edx
 16202 0001230B EBD9                <1> 	jmp	short sysenv_2
 16203                              <1> 
 16204                              <1> 
 16205                              <1> ; 22/01/2021
 16206                              <1> ; temporary - 24/01/2016
 16207                              <1> 
 16208                              <1> iget:
 16209                              <1> 	;retn
 16210                              <1> isintr:
 16211                              <1> 	;retn
 16212                              <1> iopen:
 16213                              <1> 	;retn
 16214                              <1> iclose:
 16215                              <1> 	;retn
 16216                              <1> sndc:
 16217                              <1> 	;retn
 16218                              <1> access:
 16219                              <1> 	;retn
 16220                              <1> sleep:
 16221 0001230D C3                  <1> 	retn
  3085                                  %include 'trdosk7.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - DISK READ&WRITE : trdosk7.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 25/02/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; DISK_IO.ASM (20/07/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; DISK_IO.ASM (c) 2009-2011 Erdogan TAN [ 04/07/2009 ] Last Update: 20/07/2011
    14                              <1> 
    15                              <1> disk_write:
    16                              <1> 	; 25/02/2016
    17                              <1> 	; 24/02/2016
    18                              <1> 	; 23/02/2016
    19 0001230E 807E0500            <1> 	cmp	byte [esi+LD_LBAYes], 0
    20 00012312 777B                <1>         ja      short lba_write
    21                              <1> 
    22                              <1> chs_write:
    23                              <1> 	; 25/02/2016
    24                              <1> 	; 23/02/2016
    25 00012314 C605[458A0100]03    <1> 	mov	byte [disk_rw_op], 3 ; CHS write
    26 0001231B EB0D                <1> 	jmp	short chs_rw
    27                              <1> 
    28                              <1> disk_read:
    29                              <1> 	; 25/02/2016
    30                              <1> 	; 24/02/2016
    31                              <1> 	; 23/02/2016
    32                              <1> 	; 17/02/2016
    33                              <1> 	; 14/02/2016
    34                              <1> 	; 31/01/2016 (TRDOS 386 =  TRDOS v2.0)
    35                              <1> 	; 17/10/2010
    36                              <1> 	; 18/04/2010
    37                              <1> 	;
    38                              <1> 	; INPUT -> EAX = Logical Block Address
    39                              <1> 	;	   ESI = Logical Dos Disk Table Offset (DRV)	
    40                              <1> 	;	   ECX = Sector Count	
    41                              <1> 	; 	   EBX = Destination Buffer
    42                              <1> 	; OUTPUT -> 
    43                              <1> 	;	   cf = 0 or cf = 1
    44                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX)
    45                              <1> 
    46 0001231D 807E0500            <1> 	cmp	byte [esi+LD_LBAYes], 0
    47 00012321 7775                <1>         ja      short lba_read
    48                              <1> 
    49                              <1> chs_read:
    50                              <1> 	; 25/02/2016
    51                              <1> 	; 24/02/2016
    52                              <1> 	; 23/02/2016
    53                              <1> 	; 31/01/2016 (TRDOS 386 =  TRDOS v2.0)
    54                              <1> 	; 20/07/2011
    55                              <1> 	; 04/07/2009
    56                              <1> 	;
    57                              <1> 	; INPUT -> EAX = Logical Block Address
    58                              <1> 	;	   ECX = Number of sectors to read
    59                              <1> 	; 	   ESI = Logical Dos Disk Table Offset (DRV)
    60                              <1> 	; 	   EBX = Destination Buffer
    61                              <1> 	; OUTPUT -> 
    62                              <1> 	;	   cf = 0 or cf = 1
    63                              <1> 	; (Modified registers: EAX; EBX, ECX, EDX)
    64                              <1> 
    65                              <1> 	; 23/02/2016
    66 00012323 C605[458A0100]02    <1> 	mov	byte [disk_rw_op], 2 ; CHS read
    67                              <1> 
    68                              <1> chs_rw:
    69                              <1> 	;;movzx	edx, word [esi+LD_BPB+SecPerTrack]
    70                              <1> 	;movzx	edx, byte [esi+LD_BPB+SecPerTrack] ; <= 63
    71                              <1> 	;mov	[disk_rw_spt], dl
    72                              <1> 
    73                              <1> chs_read_next_sector:
    74 0001232A C605[468A0100]04    <1> 	mov	byte [retry_count], 4
    75                              <1>      
    76                              <1> chs_read_retry:
    77                              <1> 	;mov	[sector_count], ecx ; 23/02/2016
    78                              <1> 
    79 00012331 50                  <1> 	push	eax			; Linear sector #
    80 00012332 51                  <1> 	push	ecx			; # of FAT/FILE/DIR sectors
    81                              <1>                 
    82 00012333 0FB74E1E            <1> 	movzx	ecx, word [esi+LD_BPB+SecPerTrack]
    83                              <1> 	;movzx	ecx, byte [disk_rw_spt] ; 23/02/2016
    84 00012337 29D2                <1> 	sub	edx, edx
    85 00012339 F7F1                <1> 	div	ecx
    86                              <1> 	; eax = track, dx (dl ) = sector (on track)
    87                              <1> 	;sub	cl, dl ; 24/02/2016 (spt - sec)
    88                              <1> 	;push	ecx ; *
    89 0001233B 6689D1              <1> 	mov	cx, dx			; Sector (zero based)
    90 0001233E 6641                <1> 	inc	cx			; To make it 1 based
    91 00012340 6651                <1> 	push	cx
    92 00012342 668B4E20            <1> 	mov	cx, [esi+LD_BPB+Heads]
    93 00012346 6629D2              <1> 	sub	dx, dx
    94 00012349 F7F1                <1> 	div	ecx			; Convert track to head & cyl
    95                              <1> 	; eax (ax) = cylinder, dx (dl) = head (max. FFh)
    96 0001234B 88D6                <1> 	mov	dh, dl
    97 0001234D 6659                <1> 	pop	cx			; AX=Cyl, DH=Head, CX=Sector
    98 0001234F 8A5602              <1> 	mov	dl, [esi+LD_PhyDrvNo]
    99                              <1> 
   100 00012352 88C5                <1> 	mov	ch, al			; NOTE: max. 1023 cylinders !                   
   101 00012354 C0CC02              <1> 	ror	ah, 2			; Rotate 2 bits right
   102 00012357 08E1                <1> 	or	cl, ah
   103                              <1> 
   104                              <1> 	; 24/02/2016
   105                              <1> 	;pop	eax ; * (spt - sec) (example: 63 - 0 = 63)
   106                              <1> 	;cmp	eax, [sector_count]
   107                              <1> 	;jb	short chs_write_sectors
   108                              <1> 	;je	short chs_read_sectors
   109                              <1> 	;; (# of sectors to read is more than remaining sectors on the track)
   110                              <1> 	;mov	al, [sector_count]
   111                              <1> ;chs_read_sectors: ; read or write !
   112 00012359 B001                <1> 	mov	al, 1 ; 25/02/2016
   113 0001235B 8A25[458A0100]      <1> 	mov	ah, [disk_rw_op]  ; 02h = chs read, 03h = chs write 
   114                              <1> 	;
   115 00012361 E8B92EFFFF          <1> 	call	int13h			; BIOS Service func ( ah ) = 2
   116                              <1>                                         ; Read disk sectors
   117                              <1>                                         ; AL-sec num CH-track CL-sec
   118                              <1>                                         ; DH-head DL-drive ES:BX-buffer
   119                              <1>                                         ; CF-flag AH-stat AL-sec read
   120                              <1> 	                                ; If CF = 1 then (If AH > 0)
   121 00012366 8825[478A0100]      <1> 	mov	[disk_rw_err], ah
   122                              <1> 	
   123 0001236C 59                  <1> 	pop	ecx
   124 0001236D 58                  <1> 	pop	eax
   125 0001236E 7314                <1> 	jnc	short chs_read_ok
   126                              <1> 
   127 00012370 803D[478A0100]09    <1> 	cmp	byte [disk_rw_err], 09h ; DMA crossed 64K segment boundary
   128 00012377 7408                <1> 	je	short chs_read_error_retn
   129                              <1>              
   130 00012379 FE0D[468A0100]      <1> 	dec	byte [retry_count]
   131 0001237F 75B0                <1> 	jnz	short chs_read_retry
   132                              <1> 
   133                              <1> chs_read_error_retn:
   134 00012381 F9                  <1> 	stc
   135                              <1> 	;retn
   136 00012382 EB69                <1> 	jmp	short update_drv_error_byte
   137                              <1> 
   138                              <1> ;chs_write_sectors: ; read or write 
   139                              <1> 	;; (# of sectors to read is less than remaining sectors on the track)
   140                              <1> 	;mov	[sector_count], al
   141                              <1> 	;jmp	short chs_read_sectors
   142                              <1> 
   143                              <1> chs_read_ok:
   144                              <1> 	;; 23/02/2016
   145                              <1> 	;movzx	edx, byte [sector_count] ; sector count (<= spt)	
   146                              <1>         ;sub    ecx, edx  ; remaining sector count
   147                              <1> 	;jna	short update_drv_error_byte	
   148                              <1> 	;add	eax, edx ; next disk sector
   149                              <1> 	;shl	edx, 9 ; 512 * sector count
   150                              <1> 	;add	ebx, edx ; next buffer byte address 
   151                              <1>         ;jmp     chs_read_next_sector        
   152                              <1> 	; 25/02/2016
   153 00012384 40                  <1> 	inc	eax ; next sector
   154 00012385 81C300020000        <1> 	add	ebx, 512
   155 0001238B E29D                <1> 	loop	chs_read_next_sector
   156 0001238D EB5E                <1> 	jmp	short update_drv_error_byte
   157                              <1> 
   158                              <1> lba_write:
   159                              <1> 	; 23/02/2016
   160 0001238F C605[458A0100]1C    <1> 	mov	byte [disk_rw_op], 1Ch ; LBA write
   161 00012396 EB07                <1> 	jmp	short lba_rw
   162                              <1> 
   163                              <1> lba_read:
   164                              <1> 	; 23/02/2016
   165                              <1> 	; 17/02/2016
   166                              <1> 	; 14/02/2016
   167                              <1> 	; 13/02/2016
   168                              <1> 	; 31/01/2016 (TRDOS 386 =  TRDOS v2.0)
   169                              <1> 	; 10/07/2015 (Retro UNIX 386 v1)
   170                              <1> 	;
   171                              <1> 	; INPUT -> EAX = Logical Block Address
   172                              <1> 	;	   ESI = Logical Dos Disk Table Offset (DRV)	
   173                              <1> 	;	   ECX = Sector Count	
   174                              <1> 	; 	   EBX = Destination Buffer
   175                              <1> 	; OUTPUT -> 
   176                              <1> 	;	   cf = 0 or cf = 1
   177                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX)
   178                              <1> 
   179                              <1> 	; LBA read/write (with private LBA function) 
   180                              <1> 	;((Retro UNIX 386 v1 - DISK I/O code by Erdogan Tan))
   181                              <1> 
   182                              <1> 
   183                              <1> 	; 23/02/2016
   184 00012398 C605[458A0100]1B    <1> 	mov	byte [disk_rw_op], 1Bh ; LBA read
   185                              <1> 
   186                              <1> lba_rw:
   187                              <1> 	; 17/02/2016
   188 0001239F 57                  <1> 	push	edi
   189                              <1> 
   190 000123A0 890D[488A0100]      <1> 	mov	[sector_count], ecx ; total sector (read) count
   191                              <1> 
   192 000123A6 8A5602              <1> 	mov	dl, [esi+LD_PhyDrvNo]
   193                              <1> 	; dl = physical drive number (0,1, 80h, 81h, 82h, 83h)
   194                              <1> 
   195                              <1> lba_read_next:
   196 000123A9 81F900010000        <1> 	cmp	ecx, 256
   197 000123AF 7605                <1> 	jna	short lba_read_rsc
   198 000123B1 B900010000          <1> 	mov	ecx, 256 ; 17/02/2016
   199                              <1> lba_read_rsc:
   200 000123B6 290D[488A0100]      <1> 	sub	[sector_count], ecx ; remain sectors
   201                              <1> 
   202 000123BC 89CF                <1> 	mov	edi, ecx 
   203 000123BE 89C1                <1> 	mov	ecx, eax ; sector number/address
   204                              <1> 
   205 000123C0 C605[468A0100]04    <1> 	mov	byte [retry_count], 4
   206                              <1> lba_read_retry:
   207 000123C7 89F8                <1> 	mov	eax, edi
   208                              <1> 	;
   209                              <1> 	; ecx = sector number
   210                              <1> 	; al = sector count (0 - 255) /// (0 = 256)
   211                              <1> 	; dl = drive number
   212                              <1> 	; ebx = buffer offset
   213                              <1> 	;
   214                              <1> 	; Function 1Bh = LBA read, 1Ch = LBA write
   215                              <1> 	; 23/02/2016
   216 000123C9 8A25[458A0100]      <1> 	mov	ah, [disk_rw_op] ; 1Bh = LBA read, 1Ch = LBA write
   217 000123CF E84B2EFFFF          <1> 	call	int13h
   218                              <1> 	; al = ? (changed)
   219                              <1> 	; ah = error code
   220 000123D4 8825[478A0100]      <1> 	mov	[disk_rw_err], ah
   221 000123DA 7334                <1> 	jnc	short lba_read_ok
   222 000123DC 80FC80              <1> 	cmp	ah, 80h ; time out?
   223 000123DF 740A                <1>         je      short lba_read_stc_retn
   224 000123E1 FE0D[468A0100]      <1> 	dec	byte [retry_count]
   225 000123E7 7FDE                <1> 	jg	short lba_read_retry
   226 000123E9 743A                <1> 	jz	short lba_read_reset
   227                              <1> 	; sf =  1
   228                              <1> 
   229                              <1> lba_read_stc_retn:
   230 000123EB F9                  <1> 	stc
   231                              <1> lba_read_retn:
   232 000123EC 5F                  <1> 	pop	edi
   233                              <1> 
   234                              <1> update_drv_error_byte:
   235 000123ED 9C                  <1> 	pushf
   236 000123EE 53                  <1> 	push	ebx
   237 000123EF 6651                <1> 	push	cx
   238                              <1> 	;or	ecx, ecx
   239                              <1> 	;jz	short udrv_errb0
   240 000123F1 8A0D[478A0100]      <1> 	mov	cl, [disk_rw_err]
   241                              <1> udrv_errb0:
   242 000123F7 0FB65E02            <1> 	movzx	ebx, byte [esi+LD_PhyDrvNo]
   243 000123FB 80FB02              <1> 	cmp	bl, 2
   244 000123FE 7203                <1>         jb      short udrv_errb1
   245 00012400 80EB7E              <1> 	sub	bl, 7Eh
   246                              <1> 	;cmp	bl, 5
   247                              <1> 	;ja	short udrv_errb2	
   248                              <1> udrv_errb1:
   249 00012403 81C3[416E0000]      <1>         add     ebx, drv.error ; 13/02/2016
   250 00012409 880B                <1> 	mov	[ebx], cl ; error code
   251                              <1> udrv_errb2:
   252 0001240B 6659                <1> 	pop	cx
   253 0001240D 5B                  <1> 	pop	ebx
   254 0001240E 9D                  <1> 	popf
   255 0001240F C3                  <1> 	retn
   256                              <1> 
   257                              <1> lba_read_ok:
   258 00012410 89C8                <1> 	mov	eax, ecx ; sector number
   259 00012412 01F8                <1> 	add	eax, edi ; sector number (next)
   260 00012414 C1E709              <1> 	shl	edi, 9 ; sector count * 512
   261 00012417 01FB                <1> 	add	ebx, edi ; next buffer offset
   262                              <1> 
   263 00012419 8B0D[488A0100]      <1> 	mov	ecx, [sector_count] ; remaining sectors
   264 0001241F 09C9                <1> 	or	ecx, ecx
   265 00012421 7586                <1> 	jnz	short lba_read_next
   266 00012423 EBC7                <1> 	jmp	short lba_read_retn
   267                              <1> 
   268                              <1> lba_read_reset:
   269 00012425 B40D                <1> 	mov	ah, 0Dh ; Alternate reset
   270 00012427 E8F32DFFFF          <1>         call	int13h
   271                              <1> 	; al = ? (changed)
   272                              <1> 	; ah = error code
   273 0001242C 7399                <1> 	jnc	short lba_read_retry
   274 0001242E EBBC                <1> 	jmp	short lba_read_retn
  3086                                  %include 'trdosk8.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.2) - MAIN PROGRAM : trdosk8.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 03/08/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    11                              <1> ; u0.s (20/11/2015), u4.s (14/10/2015)
    12                              <1> ; ****************************************************************************
    13                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    14                              <1> ; TRDOS2.ASM (09/11/2011)
    15                              <1> ; ----------------------------------------------------------------------------
    16                              <1> ; DIR.ASM (c) 2004-2011 Erdogan TAN  [07/01/2004] Last Update: 09/10/2011
    17                              <1> 
    18                              <1> set_run_sequence:
    19                              <1> 	; 23/12/2016
    20                              <1> 	; 10/06/2016
    21                              <1> 	; 22/05/2016
    22                              <1> 	; 20/05/2016
    23                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
    24                              <1> 	; TRDOS 386 feature only !
    25                              <1> 	;
    26                              <1> 	; INPUT ->
    27                              <1> 	;	AL = process number (next process)
    28                              <1> 	;
    29                              <1> 	;	this process must be added to run sequence
    30                              <1> 	;
    31                              <1> 	;	[u.pri] = priority of present process
    32                              <1> 	;
    33                              <1> 	;	DL = priority (queue)
    34                              <1> 	;	     0 = background (low) ; run on background 
    35                              <1> 	;	     1 = regular (normal) ; run as regular
    36                              <1> 	;	     2 = event (high)     ; run for event
    37                              <1> 	;
    38                              <1> 	;	1) If the requested process is already running:
    39                              <1> 	;	   a) If present priority is high ([u.pri]=2) 
    40                              <1> 	;	      and requested priority is also high, 
    41                              <1> 	;	      there is nothing to do! Because it has been
    42                              <1> 	;	      done already (before this attempt).		 	
    43                              <1> 	;	   b) If present priority is high ([u.pri]=2)
    44                              <1> 	;	      and requested priority is not high, there is
    45                              <1> 	;	      nothing to do! Because, it's current
    46                              <1> 	;	      run queue is unspecified, here. (It may be in
    47                              <1> 	;	      a waiting list or in a run queue; if the new
    48                              <1> 	;	      priority would be used to add it to relavant
    49                              <1>         ;             run queue, this would be wrong, unnecessary
    50                              <1> 	;	      and destabilizing duplication!)
    51                              <1> 	;	   c) If present priority is not high ([u.pri]<2)
    52                              <1>         ;             and requested priority is high (event),
    53                              <1> 	;	      process will be added to present priority's
    54                              <1> 	;	      run queue and then, priority will be changed
    55                              <1> 	;	      to high ([u.pri]=2).
    56                              <1> 	;	   d) If present priority is not high ([u.pri]<2)
    57                              <1> 	;	      and requested priority is not high, [u.pri]
    58                              <1> 	;	      value will be changed. There is nothing to do
    59                              <1> 	;	      in addition. (The new priority value will be
    60                              <1> 	;	      used by 'tswap/tswitch' procedure at 'sysret'
    61                              <1> 	;	      or 'sysrele' stage.)
    62                              <1> 	;
    63                              <1> 	;	2) If the requested process is not running:
    64                              <1> 	;	   a) If requested priority of the requested
    65                              <1> 	;	      (next) process is high (event) and priority
    66                              <1> 	;	      of present process is not high, the requested
    67                              <1> 	;	      process will be added to ('runq_event') high
    68                              <1> 	;	      priority run queue and then present (running)
    69                              <1> 	;	      process will be stopped (swapped/switched out)
    70                              <1> 	;	      immediately if it is in user mode, or it's 
    71                              <1> 	;	      [u.quant] value will be reset to 0 and (then) 
    72                              <1> 	;	      it will be stopped at 'sysret' stage.			
    73                              <1> 	;	   b) If requested priority of the requested
    74                              <1> 	;	      (next) process is high (event) and priority
    75                              <1> 	;	      of present process is also high, the requested
    76                              <1> 	;	      process will be added to ('runq_event') high
    77                              <1> 	;	      priority run queue and present (running) 
    78                              <1> 	;	      process will be allowed to run until it's 
    79                              <1> 	;	      time quantum will be elapsed ([u.quant]=0).	
    80                              <1> 	;	   c) If requested priority of the requested
    81                              <1> 	;	      (next) process is not high ('run for event'), 
    82                              <1> 	;	      there is nothing to do. Because, it's current
    83                              <1> 	;	      run queue is unspecified, here. (It may be in
    84                              <1> 	;	      a waiting list or in a run queue; if the new
    85                              <1> 	;	      priority would be used to add it to relavant
    86                              <1>         ;             run queue, this would be wrong, unnecessary
    87                              <1> 	;	      and destabilizing duplication!) 
    88                              <1> 	;
    89                              <1> 	; OUTPUT ->
    90                              <1> 	;	none
    91                              <1> 	;
    92                              <1> 	;	[u.pri] = priority of present process
    93                              <1> 	;
    94                              <1> 	;	cf = 1, if the request could not be fulfilled.
    95                              <1> 	;			 	     	  
    96                              <1> 	;	NOTE: 
    97                              <1>         ;          * Processes in 'run as regular' queue can run
    98                              <1> 	;	     if there is no process in 'run for event' queue
    99                              <1> 	;	     ('run for event' processes have higher priority)	 		 
   100                              <1> 	;	   * When [u.quant] time quantum of a process is
   101                              <1> 	;	     elapsed, it's high priority ('run for event')
   102                              <1> 	;	     status will be disabled, it can be run in sequence
   103                              <1> 	;	     of it's actual run queue.
   104                              <1> 	;	   * A 'run on background' process will always be 
   105                              <1> 	;	     sequenced in 'run on background' (low priority)
   106                              <1> 	;	     queue, it can run only when other priority queues
   107                              <1> 	;	     are empty. (idle time processes, e.g. printing)  	 	
   108                              <1> 	;
   109                              <1> 	; Modified registers: eax, ebx, edx
   110                              <1> 	;
   111                              <1> 
   112                              <1> srunseq_0:
   113 00012430 3A05[B3030300]      <1>         cmp     al, [u.uno]     ; same process ?
   114 00012436 750C                <1> 	jne	short srunseq_2 ; no
   115                              <1> 
   116 00012438 8A25[A9030300]      <1> 	mov	ah, [u.pri] 	; present/current priority
   117 0001243E 80FC02              <1> 	cmp	ah, 2       	; 'run for event' priority level
   118 00012441 7221                <1> 	jb	short srunseq_6 ; no
   119                              <1> 
   120                              <1> srunseq_1:
   121                              <1> 	; there is nothing to do!
   122 00012443 C3                  <1> 	retn
   123                              <1> 
   124                              <1> srunseq_2:
   125                              <1> 	;;this not necessary ! 23/12/2016
   126                              <1>         ;;cmp	al, nproc	; number of processes = 16 
   127                              <1> 	;;jnb	short srunseq_5	; error ! invalid process number 
   128                              <1> 
   129                              <1> 	; dl = priority
   130 00012444 80FA02              <1> 	cmp	dl, 2 		; event queue
   131 00012447 72FA                <1> 	jb	short srunseq_1 ; requested process is not present
   132                              <1> 				; process and priority of requested
   133                              <1> 				; process is not high (event), 
   134                              <1> 				; there is nothing to do!
   135                              <1> 	
   136                              <1> 	; requested process is not present process
   137                              <1> 	; & priority of requested process is high
   138 00012449 3A15[A9030300]      <1> 	cmp	dl, [u.pri] 	; priority of present process
   139 0001244F 7606                <1> 	jna	short srunseq_3 ; is high, also
   140                              <1> 	;
   141                              <1> 	; present process will be swapped/switched out
   142 00012451 FE05[218E0100]      <1> 	inc	byte [p_change] ; 1
   143                              <1> 
   144                              <1> srunseq_3:
   145                              <1> 	; add process to 'runq_event' queue for new event
   146 00012457 BB[52030300]        <1> 	mov	ebx, runq_event ; high priority run queue
   147                              <1> 
   148                              <1> srunseq_4:
   149                              <1> 	; al = process number
   150                              <1> 	; ebx = run queue
   151 0001245C E887EDFFFF          <1> 	call	putlu
   152 00012461 C3                  <1> 	retn
   153                              <1> 
   154                              <1> srunseq_5:
   155 00012462 F5                  <1> 	cmc
   156 00012463 C3                  <1> 	retn
   157                              <1> 
   158                              <1> srunseq_6:
   159                              <1> 	; present priority of the process is not high
   160                              <1> 	
   161 00012464 8815[A9030300]      <1> 	mov	[u.pri], dl ; new priority 
   162                              <1> 			    ; (will be used by 'tswap')
   163                              <1> 
   164 0001246A 80FA02              <1> 	cmp	dl, 2 		; high priority ?
   165 0001246D 72F3                <1> 	jb	short srunseq_5 ; no, there is nothing to do
   166                              <1> 				; in addition
   167                              <1> 
   168                              <1> 	; process must be added to relevant run queue, here!
   169                              <1> 	; (new priority is high/event priority and process
   170                              <1> 	; will not be added to a run queue by 'tswap')
   171                              <1> 
   172 0001246F BB[54030300]        <1> 	mov	ebx, runq_normal ; 'run as regular' queue
   173                              <1> 
   174 00012474 20E4                <1> 	and	ah, ah  ;  previous value of [u.pri]
   175 00012476 75E4                <1> 	jnz	short srunseq_4
   176                              <1> 
   177 00012478 43                  <1> 	inc	ebx
   178 00012479 43                  <1> 	inc	ebx
   179                              <1> 	; ebx = runq_background ; 'run on backgroud' queue 
   180                              <1> 
   181 0001247A EBE0                <1> 	jmp	short srunseq_4
   182                              <1> clock:
   183                              <1> 	; 23/05/2016
   184                              <1> 	; 22/05/2016
   185                              <1> 	; 20/05/2016
   186                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
   187                              <1> 	; 14/05/2015 - 14/10/2015 (Retro UNIX 386 v1)
   188                              <1> 	; 07/12/2013 - 10/04/2014 (Retro UNIX 8086 v1)
   189                              <1> 
   190 0001247C 803D[A8030300]00    <1> 	cmp	byte [u.quant], 0
   191 00012483 772C                <1> 	ja	short clk_1
   192                              <1> 	;
   193 00012485 803D[B3030300]01    <1> 	cmp     byte [u.uno], 1 ; /etc/init ? (for Retro UNIX 8086 & 386 v1)
   194                              <1> 				; MainProg (Kernel's Command Interpreter)
   195                              <1> 				; for TRDOS 386.
   196 0001248C 7623                <1> 	jna	short clk_1 ; yes, do not swap out
   197                              <1> 	;
   198 0001248E 803D[5B030300]FF    <1> 	cmp     byte [sysflg], 0FFh ; user or system space ?
   199 00012495 7520                <1> 	jne	short clk_2 	    ; system space (sysflg <> 0FFh)
   200                              <1> 	;
   201 00012497 66833D[AA030300]00  <1> 	cmp	word [u.intr], 0
   202 0001249F 7616                <1> 	jna	short clk_2
   203                              <1> 	;
   204                              <1> 	; 23/05/2016
   205 000124A1 803D[228E0100]00    <1> 	cmp	byte [multi_tasking], 0
   206 000124A8 760D                <1> 	jna	short clk_2
   207                              <1> 	;
   208 000124AA FE05[218E0100]      <1> 	inc	byte [p_change] ; it is time to change running process	
   209 000124B0 C3                  <1> 	retn
   210                              <1> clk_1:
   211 000124B1 FE0D[A8030300]      <1> 	dec	byte [u.quant]
   212                              <1> clk_2:
   213 000124B7 C3                  <1> 	retn   ; return to (hardware) timer interrupt routine
   214                              <1> 
   215                              <1> ; 12/10/2017
   216                              <1> ; 15/01/2017
   217                              <1> ; 14/01/2017
   218                              <1> ; 07/01/2017
   219                              <1> ; 02/01/2017
   220                              <1> ; 17/08/2016
   221                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   222                              <1> int34h:  ; #IOCTL# (I/O port access support for ring 3)
   223                              <1> ; 23/05/2016
   224                              <1> 	; 20/06/2016
   225                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   226                              <1> 	;
   227                              <1> 	; INPUT ->
   228                              <1> 	;	AH = 0 -> read port  (physical IO port) -byte-
   229                              <1> 	;	AH = 1 -> write port (physical IO port) -byte-
   230                              <1> 	;		AL = data byte
   231                              <1> 	;	AH = 2 -> read port  (physical IO port) -word-
   232                              <1> 	;	AH = 3 -> write port (physical IO port) -word-
   233                              <1> 	;		BX = data word
   234                              <1> 	;	AH = 4 -> read port  (physical IO port) -dword-
   235                              <1> 	;	AH = 5 -> write port (physical IO port) -dword-
   236                              <1> 	;		EBX = data dword
   237                              <1> 	;	; 12/10/2017
   238                              <1> 	;	AH = 6 -> read port (physical IO port) twice -byte-
   239                              <1> 	;	AH = 7 -> write port (physical IO port) twice -byte-
   240                              <1> 	;		BX = data word	
   241                              <1> 	;
   242                              <1> 	;	DX = Port number (<= 0FFFFh)
   243                              <1> 	;
   244                              <1> 	; OUTPUT ->
   245                              <1> 	;	AL = data byte (in al, dx)
   246                              <1> 	;	AX = data word (in ax, dx)
   247                              <1> 	;	EAX = data dword (in eax, dx)
   248                              <1> 	;
   249                              <1> 	;	(ECX = actual TRANSFER COUNT for string functions)
   250                              <1> 	;
   251                              <1> 	;
   252                              <1> 	; Modified registers: EAX
   253                              <1> 	;
   254                              <1> 
   255                              <1> 	;cmp	ah, 5
   256                              <1> 	;ja	short int34h_5 ; invalid function !
   257                              <1> 
   258                              <1> 	; 12/10/2017
   259 000124B8 80FC07              <1> 	cmp	ah, 7
   260 000124BB 7743                <1> 	ja	short int34h_5 ; invalid function !
   261                              <1> 
   262                              <1> 	;; 15/01/2017
   263                              <1> 	; 14/01/2017
   264                              <1> 	; 02/01/2017
   265                              <1> 	;;mov	byte [ss:intflg], 34h	; IOCTL interrupt 
   266 000124BD FB                  <1> 	sti
   267                              <1> 	
   268                              <1> 	;sti	; enable interrupts
   269 000124BE 80642408FE          <1> 	and	byte [esp+8], 11111110b	; clear carry bit of eflags register
   270                              <1> 
   271 000124C3 80FC01              <1> 	cmp	ah, 1
   272 000124C6 7205                <1> 	jb	short int34h_0
   273 000124C8 7705                <1> 	ja	short int34h_1
   274                              <1> 
   275 000124CA EE                  <1> 	out	dx, al
   276                              <1> 	;iretd
   277 000124CB EB01                <1> 	jmp short int34h_iret
   278                              <1> 
   279                              <1> int34h_0:
   280 000124CD EC                  <1> 	in	al, dx
   281                              <1> 	;iretd
   282                              <1> int34h_iret:
   283                              <1> 	;cli	; 07/01/2017
   284                              <1> 	;; 15/01/2017
   285                              <1> 	;;mov	byte [ss:intflg], 0 ; reset
   286 000124CE CF                  <1> 	iretd 
   287                              <1> 
   288                              <1> int34h_1:
   289 000124CF F6C401              <1> 	test	ah, 1
   290 000124D2 7516                <1> 	jnz	short int34h_3 ; out
   291                              <1> 
   292                              <1> 	; in
   293 000124D4 80FC02              <1> 	cmp	ah, 2
   294 000124D7 7707                <1> 	ja	short int34h_2
   295                              <1> 
   296 000124D9 6689D8              <1> 	mov	ax, bx
   297 000124DC 66ED                <1> 	in	ax, dx
   298                              <1> 	;iretd
   299 000124DE EBEE                <1> 	jmp	short int34h_iret
   300                              <1> 
   301                              <1> int34h_2:
   302 000124E0 80FC04              <1> 	cmp	ah, 4
   303 000124E3 772C                <1> 	ja	short int34h_7	; 12/10/2017
   304                              <1> 	; ah = 4
   305 000124E5 89D8                <1> 	mov	eax, ebx
   306 000124E7 ED                  <1> 	in	eax, dx
   307                              <1> 	;iretd
   308 000124E8 EBE4                <1> 	jmp	short int34h_iret
   309                              <1> 
   310                              <1> int34h_3:
   311 000124EA 80FC03              <1> 	cmp	ah, 3
   312 000124ED 7707                <1> 	ja	short int34h_4
   313                              <1> 
   314 000124EF 6689D8              <1> 	mov	ax, bx
   315 000124F2 66EF                <1> 	out	dx, ax
   316                              <1> 	;iretd
   317 000124F4 EBD8                <1> 	jmp	short int34h_iret
   318                              <1> 
   319                              <1> int34h_4:
   320 000124F6 80FC05              <1> 	cmp	ah, 5
   321 000124F9 770B                <1> 	ja	short int34h_6	; 12/10/2017
   322                              <1> 	; ah = 5
   323 000124FB 89D8                <1> 	mov	eax, ebx
   324 000124FD EF                  <1> 	out	dx, eax
   325                              <1> 	;iretd
   326 000124FE EBCE                <1> 	jmp	short int34h_iret
   327                              <1> 
   328                              <1> int34h_5:
   329 00012500 804C240801          <1> 	or	byte [esp+8], 1	; set carry bit of eflags register
   330 00012505 CF                  <1> 	iretd
   331                              <1> 
   332                              <1> 	; 12/10/2017
   333                              <1> int34h_6:
   334 00012506 6689D8              <1> 	mov	ax, bx
   335 00012509 EE                  <1> 	out	dx, al
   336 0001250A EB00                <1> 	jmp	short $+2
   337 0001250C 86E0                <1> 	xchg	ah, al
   338 0001250E EE                  <1> 	out	dx, al
   339                              <1> 	;xchg	al, ah
   340                              <1> 	;iretd
   341 0001250F EB06                <1> 	jmp	short int34h_8
   342                              <1> int34h_7:
   343 00012511 EC                  <1> 	in	al, dx
   344 00012512 EB00                <1> 	jmp	short $+2
   345 00012514 88C4                <1> 	mov	ah, al
   346 00012516 EC                  <1> 	in	al, dx
   347                              <1> int34h_8:
   348 00012517 86C4                <1> 	xchg	al, ah
   349 00012519 CF                  <1> 	iretd
   350                              <1> 			
   351                              <1> 
   352                              <1> INT4Ah:
   353                              <1> 	; 24/01/2016
   354                              <1> 	; this procedure will be called by 'RTC_INT' (in 'timer.s')
   355 0001251A C3                  <1> 	retn
   356                              <1> 
   357                              <1> ; u0.s
   358                              <1> ; Retro UNIX 386 v1 Kernel (v0.2) - SYS0.INC
   359                              <1> ; Last Modification: 20/11/2015
   360                              <1> 
   361                              <1> com2_int:
   362                              <1> 	; 07/11/2015 
   363                              <1> 	; 24/10/2015
   364                              <1> 	; 23/10/2015
   365                              <1> 	; 14/03/2015 (Retro UNIX 386 v1 - Beginning)
   366                              <1> 	; 28/07/2014 (Retro UNIX 8086 v1)
   367                              <1> 	; < serial port 2 interrupt handler >
   368                              <1> 	;
   369 0001251B 890424              <1> 	mov 	[esp], eax ; overwrite call return address
   370                              <1> 	;push	eax
   371 0001251E 66B80900            <1> 	mov	ax, 9
   372 00012522 EB07                <1> 	jmp	short comm_int
   373                              <1> com1_int:
   374                              <1> 	; 07/11/2015
   375                              <1> 	; 24/10/2015
   376 00012524 890424              <1> 	mov 	[esp], eax ; overwrite call return address
   377                              <1> 	; 23/10/2015
   378                              <1> 	;push	eax
   379 00012527 66B80800            <1> 	mov	ax, 8
   380                              <1> comm_int:
   381                              <1> 	; 20/11/2015
   382                              <1> 	; 18/11/2015
   383                              <1> 	; 17/11/2015
   384                              <1> 	; 16/11/2015
   385                              <1> 	; 09/11/2015
   386                              <1> 	; 08/11/2015
   387                              <1> 	; 07/11/2015
   388                              <1> 	; 06/11/2015 (serial4.asm, 'serial')	
   389                              <1> 	; 01/11/2015
   390                              <1> 	; 26/10/2015
   391                              <1> 	; 23/10/2015
   392 0001252B 53                  <1> 	push	ebx
   393 0001252C 56                  <1> 	push	esi
   394 0001252D 57                  <1> 	push	edi
   395 0001252E 1E                  <1> 	push 	ds
   396 0001252F 06                  <1> 	push 	es
   397                              <1> 	; 18/11/2015
   398 00012530 0F20DB              <1> 	mov	ebx, cr3
   399 00012533 53                  <1> 	push	ebx ; ****
   400                              <1> 	;
   401 00012534 51                  <1> 	push	ecx ; ***
   402 00012535 52                  <1> 	push	edx ; **
   403                              <1> 	;
   404 00012536 BB10000000          <1> 	mov	ebx, KDATA
   405 0001253B 8EDB                <1> 	mov	ds, bx
   406 0001253D 8EC3                <1> 	mov	es, bx
   407                              <1> 	;
   408 0001253F 8B0D[90810100]      <1> 	mov	ecx, [k_page_dir]
   409 00012545 0F22D9              <1> 	mov	cr3, ecx
   410                              <1> 	; 20/11/2015
   411                              <1> 	; Interrupt identification register
   412 00012548 66BAFA02            <1> 	mov	dx, 2FAh ; COM2
   413                              <1> 	;
   414 0001254C 3C08                <1> 	cmp 	al, 8 
   415 0001254E 7702                <1> 	ja 	short com_i0
   416                              <1> 	;
   417                              <1> 	; 20/11/2015
   418                              <1> 	; 17/11/2015
   419                              <1> 	; 16/11/2015
   420                              <1> 	; 15/11/2015
   421                              <1> 	; 24/10/2015
   422                              <1> 	; 14/03/2015 (Retro UNIX 386 v1 - Beginning)
   423                              <1> 	; 28/07/2014 (Retro UNIX 8086 v1)
   424                              <1> 	; < serial port 1 interrupt handler >
   425                              <1> 	;
   426 00012550 FEC6                <1> 	inc	dh ; 3FAh ; COM1 Interrupt id. register
   427                              <1> com_i0:
   428                              <1> 	;push	eax ; *
   429                              <1> 	; 07/11/2015
   430 00012552 A2[FA810100]        <1> 	mov 	byte [ccomport], al
   431                              <1> 	; 09/11/2015
   432 00012557 0FB7D8              <1> 	movzx	ebx, ax ; 8 or 9
   433                              <1> 	; 17/11/2015
   434                              <1>  	; reset request for response status
   435 0001255A 88A3[F0810100]      <1> 	mov	[ebx+req_resp-8], ah ; 0
   436                              <1> 	;
   437                              <1> 	; 20/11/2015
   438 00012560 EC                  <1> 	in	al, dx		; read interrupt id. register
   439 00012561 EB00                <1> 	JMP	$+2	   	; I/O DELAY
   440 00012563 2404                <1> 	and	al, 4		; received data available?	
   441 00012565 7470                <1> 	jz	short com_eoi	; (transmit. holding reg. empty)
   442                              <1> 	;
   443                              <1> 	; 20/11/2015
   444 00012567 80EA02              <1> 	sub	dl, 3FAh-3F8h	; data register (3F8h, 2F8h)
   445 0001256A EC                  <1> 	in	al, dx     	; read character
   446                              <1> 	;JMP	$+2	   	; I/O DELAY
   447                              <1> 	; 08/11/2015
   448                              <1> 	; 07/11/2015
   449 0001256B 89DE                <1> 	mov	esi, ebx 
   450 0001256D 89DF                <1> 	mov	edi, ebx
   451 0001256F 81C6[F4810100]      <1> 	add 	esi, rchar - 8 ; points to last received char
   452 00012575 81C7[F6810100]      <1> 	add	edi, schar - 8 ; points to last sent char
   453 0001257B 8806                <1> 	mov	[esi], al ; received char (current char)
   454                              <1> 	; query
   455 0001257D 20C0                <1> 	and	al, al
   456 0001257F 7527                <1> 	jnz	short com_i2
   457                              <1>    	; response
   458                              <1> 	; 17/11/2015
   459                              <1> 	; set request for response status
   460 00012581 FE83[F0810100]      <1>         inc     byte [ebx+req_resp-8] ; 1 
   461                              <1> 	;
   462 00012587 6683C205            <1> 	add	dx, 3FDh-3F8h	; (3FDh, 2FDh)
   463 0001258B EC                  <1> 	in	al, dx	   	; read line status register 
   464 0001258C EB00                <1> 	JMP	$+2	   	; I/O DELAY
   465 0001258E 2420                <1> 	and	al, 20h	   	; transmitter holding reg. empty?
   466 00012590 7445                <1> 	jz	short com_eoi 	; no
   467 00012592 B0FF                <1> 	mov 	al, 0FFh   	; response			
   468 00012594 6683EA05            <1> 	sub	dx, 3FDh-3F8h 	; data port (3F8h, 2F8h)
   469 00012598 EE                  <1> 	out	dx, al	   	; send on serial port
   470                              <1> 	; 17/11/2015
   471 00012599 803F00              <1> 	cmp 	byte [edi], 0   ; query ? (schar)
   472 0001259C 7502                <1> 	jne 	short com_i1    ; no
   473 0001259E 8807                <1> 	mov	[edi], al 	; 0FFh (responded)
   474                              <1> com_i1:
   475                              <1> 	; 17/11/2015
   476                              <1> 	; reset request for response status (again)
   477 000125A0 FE8B[F0810100]      <1>         dec     byte [ebx+req_resp-8] ; 0 
   478 000125A6 EB2F                <1> 	jmp	short com_eoi
   479                              <1> com_i2:	
   480                              <1> 	; 08/11/2015
   481 000125A8 3CFF                <1> 	cmp 	al, 0FFh	; (response ?)
   482 000125AA 7417                <1> 	je	short com_i3	; (check for response signal)
   483                              <1> 	; 07/11/2015
   484 000125AC 3C04                <1> 	cmp	al, 04h	; EOT
   485 000125AE 751C                <1> 	jne	short com_i4	
   486                              <1> 	; EOT = 04h (End of Transmit) - 'CTRL + D'
   487                              <1> 	;(an EOT char is supposed as a ctrl+brk from the terminal)
   488                              <1> 	; 08/11/2015
   489                              <1> 		; ptty -> tty 0 to 7 (pseudo screens)
   490 000125B0 861D[BE810100]      <1> 	xchg	bl, [ptty]  ; tty number (8 or 9)
   491 000125B6 E81550FFFF          <1> 	call 	ctrlbrk
   492 000125BB 861D[BE810100]      <1> 	xchg	[ptty], bl ; (restore ptty value and BL value)
   493                              <1> 	;mov	al, 04h ; EOT
   494                              <1> 	; 08/11/2015
   495 000125C1 EB09                <1> 	jmp	short com_i4	
   496                              <1> com_i3:
   497                              <1> 	; 08/11/2015
   498                              <1> 	; If 0FFh has been received just after a query
   499                              <1> 	; (schar, ZERO), it is a response signal.
   500                              <1> 	; 17/11/2015
   501 000125C3 803F00              <1>         cmp     byte [edi], 0 ; query ? (schar)
   502 000125C6 7704                <1> 	ja	short com_i4 ; no
   503                              <1> 	; reset query status (schar)
   504 000125C8 8807                <1> 	mov	[edi], al ; 0FFh
   505 000125CA FEC0                <1> 	inc	al ; 0
   506                              <1> com_i4:
   507                              <1> 	; 27/07/2014
   508                              <1> 	; 09/07/2014
   509 000125CC D0E3                <1> 	shl	bl, 1	
   510 000125CE 81C3[C0810100]      <1> 	add	ebx, ttychr
   511                              <1> 	; 23/07/2014 (always overwrite)
   512                              <1> 	;;cmp	word [ebx], 0
   513                              <1> 	;;ja	short com_eoi
   514                              <1> 	;
   515 000125D4 668903              <1> 	mov	[ebx], ax   ; Save ascii code
   516                              <1> 			    ; scan code = 0
   517                              <1> com_eoi:
   518                              <1> 	;mov	al, 20h
   519                              <1> 	;out	20h, al	   ; end of interrupt
   520                              <1> 	;
   521                              <1> 	; 07/11/2015
   522                              <1>       	;pop	eax ; *
   523 000125D7 A0[FA810100]        <1> 	mov	al, byte [ccomport] ; current COM port
   524                              <1> 	 ; al = tty number (8 or 9)
   525 000125DC E85E010000          <1>         call	wakeup
   526                              <1> com_iret:
   527                              <1> 	; 23/10/2015
   528 000125E1 5A                  <1> 	pop	edx ; **
   529 000125E2 59                  <1> 	pop	ecx ; ***
   530                              <1> 	; 18/11/2015
   531                              <1> 	;pop	eax ; ****
   532                              <1> 	;mov	cr3, eax
   533                              <1> 	;jmp	iiret
   534 000125E3 E9C3E7FEFF          <1> 	jmp	iiretp
   535                              <1> 
   536                              <1> ;iiretp: ; 01/09/2015
   537                              <1> ;	; 28/08/2015
   538                              <1> ;	pop	eax ; (*) page directory
   539                              <1> ;	mov	cr3, eax
   540                              <1> ;iiret:
   541                              <1> ;	; 22/08/2014
   542                              <1> ;	mov	al, 20h ; END OF INTERRUPT COMMAND TO 8259
   543                              <1> ;	out	20h, al	; 8259 PORT
   544                              <1> ;	;
   545                              <1> ;	pop	es
   546                              <1> ;	pop	ds
   547                              <1> ;	pop	edi
   548                              <1> ;	pop	esi
   549                              <1> ;	pop	ebx ; 29/08/2014
   550                              <1> ;	pop 	eax
   551                              <1> ;	iretd
   552                              <1> 
   553                              <1> sp_init:
   554                              <1> 	; 07/11/2015
   555                              <1> 	; 29/10/2015
   556                              <1> 	; 26/10/2015
   557                              <1> 	; 23/10/2015
   558                              <1> 	; 29/06/2015
   559                              <1> 	; 14/03/2015 (Retro UNIX 386 v1 - 115200 baud)
   560                              <1> 	; 28/07/2014 (Retro UNIX 8086 v1 - 9600 baud)
   561                              <1> 	; Initialization of Serial Port Communication Parameters
   562                              <1> 	; (COM1 base port address = 3F8h, COM1 Interrupt = IRQ 4)
   563                              <1> 	; (COM2 base port address = 2F8h, COM1 Interrupt = IRQ 3)
   564                              <1> 	;
   565                              <1> 	; ((Modified registers: EAX, ECX, EDX, EBX))
   566                              <1> 	;
   567                              <1> 	; INPUT:  (29/06/2015)
   568                              <1> 	;	AL = 0 for COM1
   569                              <1> 	;	     1 for COM2
   570                              <1> 	;	AH = Communication parameters	
   571                              <1> 	;
   572                              <1> 	;  (*) Communication parameters (except BAUD RATE):
   573                              <1> 	;	Bit	4	3	2	1	0
   574                              <1> 	;		-PARITY--   STOP BIT  -WORD LENGTH-	 		 
   575                              <1> 	;  this one -->	00 = none    0 = 1 bit  11 = 8 bits
   576                              <1> 	;		01 = odd     1 = 2 bits	10 = 7 bits
   577                              <1> 	;		11 = even
   578                              <1> 	;  Baud rate setting bits: (29/06/2015)
   579                              <1> 	;		Retro UNIX 386 v1 feature only !
   580                              <1> 	;	Bit	7    6    5  | Baud rate
   581                              <1> 	;		------------------------
   582                              <1> 	;	value	0    0    0  | Default (Divisor = 1)
   583                              <1> 	;		0    0    1  | 9600 (12)
   584                              <1> 	;		0    1    0  | 19200 (6) 
   585                              <1> 	;		0    1	  1  | 38400 (3) 
   586                              <1> 	;		1    0	  0  | 14400 (8)
   587                              <1> 	;		1    0	  1  | 28800 (4)
   588                              <1> 	;		1    1    0  | 57600 (2)
   589                              <1> 	;		1    1    1  | 115200 (1) 	
   590                              <1> 	
   591                              <1> 	; References:	
   592                              <1> 	; (1) IBM PC-XT Model 286 BIOS Source Code
   593                              <1> 	;     RS232.ASM --- 10/06/1985 COMMUNICATIONS BIOS (RS232)
   594                              <1> 	; (2) Award BIOS 1999 - ATORGS.ASM
   595                              <1> 	; (3) http://wiki.osdev.org/Serial_Ports
   596                              <1> 	;
   597                              <1> 	; Set communication parameters for COM1 (= 03h)	
   598                              <1> 	;
   599 000125E8 BB[F6810100]        <1> 	mov	ebx, com1p		; COM1 parameters  
   600 000125ED 66BAF803            <1> 	mov	dx, 3F8h		; COM1
   601                              <1> 	 ; 29/10/2015
   602 000125F1 66B90103            <1> 	mov	cx, 301h  ; divisor = 1 (115200 baud)
   603 000125F5 E86F000000          <1> 	call	sp_i3	; call A4	
   604 000125FA A880                <1> 	test	al, 80h
   605 000125FC 7410                <1> 	jz	short sp_i0 ; OK..
   606                              <1> 		; Error !
   607                              <1> 	;mov	dx, 3F8h
   608 000125FE 80EA05              <1> 	sub	dl, 5 ; 3FDh -> 3F8h
   609 00012601 66B90E03            <1> 	mov	cx, 30Eh  ; divisor = 12 (9600 baud)
   610 00012605 E85F000000          <1> 	call	sp_i3	; call A4	
   611 0001260A A880                <1> 	test	al, 80h
   612 0001260C 7508                <1> 	jnz	short sp_i1
   613                              <1> sp_i0:
   614                              <1>         ; (Note: Serial port interrupts will be disabled here...)	
   615                              <1>         ; (INT 14h initialization code disables interrupts.)
   616                              <1> 	;
   617 0001260E C603E3              <1> 	mov	byte [ebx], 0E3h ; 11100011b
   618 00012611 E8DC000000          <1> 	call	sp_i5 ; 29/06/2015
   619                              <1> sp_i1:
   620 00012616 43                  <1> 	inc	ebx
   621 00012617 66BAF802            <1> 	mov	dx, 2F8h		; COM2
   622                              <1> 	 ; 29/10/2015
   623 0001261B 66B90103            <1> 	mov	cx, 301h  ; divisor = 1 (115200 baud)
   624 0001261F E845000000          <1> 	call	sp_i3	; call A4	
   625 00012624 A880                <1> 	test	al, 80h
   626 00012626 7410                <1> 	jz	short sp_i2 ; OK..
   627                              <1> 		; Error !
   628                              <1> 	;mov	dx, 2F8h
   629 00012628 80EA05              <1> 	sub	dl, 5 ; 2FDh -> 2F8h
   630 0001262B 66B90E03            <1> 	mov	cx, 30Eh  ; divisor = 12 (9600 baud)
   631 0001262F E835000000          <1> 	call	sp_i3	; call A4	
   632 00012634 A880                <1> 	test	al, 80h
   633 00012636 7530                <1> 	jnz	short sp_i7
   634                              <1> sp_i2:
   635 00012638 C603E3              <1> 	mov	byte [ebx], 0E3h ; 11100011b
   636                              <1> sp_i6:
   637                              <1> 	;; COM2 - enabling IRQ 3
   638                              <1> 	; 07/11/2015
   639                              <1> 	; 26/10/2015
   640 0001263B 9C                  <1> 	pushf
   641 0001263C FA                  <1> 	cli
   642                              <1> 	;
   643 0001263D 66BAFC02            <1> 	mov	dx, 2FCh   		; modem control register
   644 00012641 EC                  <1> 	in	al, dx 	   		; read register
   645 00012642 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   646 00012644 0C08                <1> 	or	al, 8      		; enable bit 3 (OUT2)
   647 00012646 EE                  <1> 	out	dx, al     		; write back to register
   648 00012647 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   649 00012649 66BAF902            <1> 	mov	dx, 2F9h   		; interrupt enable register
   650 0001264D EC                  <1> 	in	al, dx     		; read register
   651 0001264E EB00                <1> 	JMP	$+2	   		; I/O DELAY
   652                              <1> 	;or	al, 1      		; receiver data interrupt enable and
   653 00012650 0C03                <1> 	or	al, 3	   		; transmitter empty interrupt enable
   654 00012652 EE                  <1> 	out	dx, al 	   		; write back to register
   655 00012653 EB00                <1> 	JMP	$+2        		; I/O DELAY
   656 00012655 E421                <1> 	in	al, 21h    		; read interrupt mask register
   657 00012657 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   658 00012659 24F7                <1> 	and	al, 0F7h   		; enable IRQ 3 (COM2)
   659 0001265B E621                <1> 	out	21h, al    		; write back to register
   660                              <1> 	;
   661                              <1> 	; 23/10/2015
   662 0001265D B8[1B250100]        <1> 	mov 	eax, com2_int
   663 00012662 A3[3A270100]        <1> 	mov	[com2_irq3], eax
   664                              <1> 	; 26/10/2015
   665 00012667 9D                  <1> 	popf	
   666                              <1> sp_i7:
   667 00012668 C3                  <1> 	retn
   668                              <1> 
   669                              <1> sp_i3:
   670                              <1> ;A4:  	;-----	INITIALIZE THE COMMUNICATIONS PORT
   671                              <1> 	; 28/10/2015
   672 00012669 FEC2                <1> 	inc	dl	; 3F9h (2F9h)	; 3F9h, COM1 Interrupt enable register 
   673 0001266B B000                <1> 	mov	al, 0
   674 0001266D EE                  <1> 	out	dx, al			; disable serial port interrupt
   675 0001266E EB00                <1> 	JMP	$+2			; I/O DELAY
   676 00012670 80C202              <1> 	add	dl, 2 	; 3FBh (2FBh)	; COM1 Line control register (3FBh)
   677 00012673 B080                <1> 	mov	al, 80h			
   678 00012675 EE                  <1> 	out	dx, al			; SET DLAB=1 ; divisor latch access bit
   679                              <1> 	;-----	SET BAUD RATE DIVISOR
   680                              <1> 	; 26/10/2015
   681 00012676 80EA03              <1> 	sub 	dl, 3   ; 3F8h (2F8h)	; register for least significant byte
   682                              <1> 					; of the divisor value
   683 00012679 88C8                <1> 	mov	al, cl	; 1
   684 0001267B EE                  <1> 	out	dx, al			; 1 = 115200 baud (Retro UNIX 386 v1)
   685                              <1> 					; 2 = 57600 baud
   686                              <1> 					; 3 = 38400 baud
   687                              <1> 					; 6 = 19200 baud
   688                              <1> 					; 12 = 9600 baud (Retro UNIX 8086 v1)
   689 0001267C EB00                <1> 	JMP	$+2			; I/O DELAY
   690 0001267E 28C0                <1> 	sub	al, al
   691 00012680 FEC2                <1> 	inc	dl      ; 3F9h (2F9h)	; register for most significant byte
   692                              <1> 					; of the divisor value
   693 00012682 EE                  <1> 	out	dx, al ; 0
   694 00012683 EB00                <1> 	JMP	$+2			; I/O DELAY
   695                              <1> 	;	
   696 00012685 88E8                <1> 	mov	al, ch ; 3		; 8 data bits, 1 stop bit, no parity
   697                              <1> 	;and	al, 1Fh ; Bits 0,1,2,3,4	
   698 00012687 80C202              <1> 	add	dl, 2	; 3FBh (2FBh)	; Line control register
   699 0001268A EE                  <1> 	out	dx, al			
   700 0001268B EB00                <1> 	JMP	$+2			; I/O DELAY
   701                              <1> 	; 29/10/2015
   702 0001268D FECA                <1> 	dec 	dl 	; 3FAh (2FAh)	; FIFO Control register (16550/16750)
   703 0001268F 30C0                <1> 	xor	al, al			; 0
   704 00012691 EE                  <1> 	out	dx, al			; Disable FIFOs (reset to 8250 mode)
   705 00012692 EB00                <1> 	JMP	$+2	
   706                              <1> sp_i4:
   707                              <1> ;A18:	;-----	COMM PORT STATUS ROUTINE
   708                              <1> 	; 29/06/2015 (line status after modem status)
   709 00012694 80C204              <1> 	add	dl, 4	; 3FEh (2FEh)	; Modem status register
   710                              <1> sp_i4s:
   711 00012697 EC                  <1> 	in	al, dx			; GET MODEM CONTROL STATUS
   712 00012698 EB00                <1> 	JMP	$+2			; I/O DELAY
   713 0001269A 88C4                <1> 	mov	ah, al			; PUT IN (AH) FOR RETURN
   714 0001269C FECA                <1> 	dec	dl	; 3FDh (2FDh)	; POINT TO LINE STATUS REGISTER
   715                              <1> 					; dx = 3FDh for COM1, 2FDh for COM2
   716 0001269E EC                  <1> 	in	al, dx			; GET LINE CONTROL STATUS
   717                              <1> 	; AL = Line status, AH = Modem status
   718 0001269F C3                  <1> 	retn
   719                              <1> 
   720                              <1> sp_status:
   721                              <1> 	; 29/06/2015
   722                              <1> 	; 27/06/2015 (Retro UNIX 386 v1)
   723                              <1> 	; Get serial port status
   724 000126A0 66BAFE03            <1> 	mov	dx, 3FEh		; Modem status register (COM1)
   725 000126A4 28C6                <1> 	sub	dh, al			; dh = 2 for COM2 (al = 1)
   726                              <1> 					; dx = 2FEh for COM2
   727 000126A6 EBEF                <1> 	jmp	short sp_i4s
   728                              <1> 
   729                              <1> sp_setp: ; Set serial port communication parameters
   730                              <1> 	; 07/11/2015
   731                              <1> 	; 29/10/2015
   732                              <1> 	; 29/06/2015
   733                              <1> 	; Retro UNIX 386 v1 feature only !	
   734                              <1> 	;
   735                              <1> 	; INPUT:
   736                              <1> 	;	AL = 0 for COM1
   737                              <1> 	;	     1 for COM2
   738                              <1> 	;	AH = Communication parameters (*)
   739                              <1> 	; OUTPUT:
   740                              <1> 	;	CL = Line status
   741                              <1> 	;	CH = Modem status
   742                              <1> 	;   If cf = 1 -> Error code in [u.error]
   743                              <1> 	;		 'invalid parameter !' 
   744                              <1> 	;		 	 or
   745                              <1> 	;		 'device not ready !' error
   746                              <1> 	;	
   747                              <1> 	;  (*) Communication parameters (except BAUD RATE):
   748                              <1> 	;	Bit	4	3	2	1	0
   749                              <1> 	;		-PARITY--   STOP BIT  -WORD LENGTH-	 		 
   750                              <1> 	;  this one -->	00 = none    0 = 1 bit  11 = 8 bits
   751                              <1> 	;		01 = odd     1 = 2 bits	10 = 7 bits
   752                              <1> 	;		11 = even
   753                              <1> 	;  Baud rate setting bits: (29/06/2015)
   754                              <1> 	;		Retro UNIX 386 v1 feature only !
   755                              <1> 	;	Bit	7    6    5  | Baud rate
   756                              <1> 	;		------------------------
   757                              <1> 	;	value	0    0    0  | Default (Divisor = 1)
   758                              <1> 	;		0    0    1  | 9600 (12)
   759                              <1> 	;		0    1    0  | 19200 (6) 
   760                              <1> 	;		0    1	  1  | 38400 (3) 
   761                              <1> 	;		1    0	  0  | 14400 (8)
   762                              <1> 	;		1    0	  1  | 28800 (4)
   763                              <1> 	;		1    1    0  | 57600 (2)
   764                              <1> 	;		1    1    1  | 115200 (1) 
   765                              <1> 	;
   766                              <1> 	; (COM1 base port address = 3F8h, COM1 Interrupt = IRQ 4)
   767                              <1> 	; (COM2 base port address = 2F8h, COM1 Interrupt = IRQ 3)
   768                              <1> 	;
   769                              <1> 	; ((Modified registers: EAX, ECX, EDX, EBX))
   770                              <1> 	;
   771 000126A8 66BAF803            <1> 	mov	dx, 3F8h
   772 000126AC BB[F6810100]        <1> 	mov	ebx, com1p ; COM1 control byte offset
   773 000126B1 3C01                <1> 	cmp	al, 1
   774 000126B3 776B                <1> 	ja 	short sp_invp_err
   775 000126B5 7203                <1> 	jb	short sp_setp1 ;  COM1 (AL = 0)
   776 000126B7 FECE                <1> 	dec	dh ; 2F8h
   777 000126B9 43                  <1> 	inc	ebx ; COM2 control byte offset
   778                              <1> sp_setp1:
   779                              <1> 	; 29/10/2015
   780 000126BA 8823                <1> 	mov	[ebx], ah
   781 000126BC 0FB6CC              <1> 	movzx 	ecx, ah
   782 000126BF C0E905              <1> 	shr	cl, 5 ; -> baud rate index
   783 000126C2 80E41F              <1> 	and	ah, 1Fh ; communication parameters except baud rate
   784 000126C5 8A81[2F270100]      <1> 	mov	al, [ecx+b_div_tbl]
   785 000126CB 6689C1              <1> 	mov	cx, ax
   786 000126CE E896FFFFFF          <1> 	call	sp_i3
   787 000126D3 6689C1              <1> 	mov	cx, ax ; CL = Line status, CH = Modem status
   788 000126D6 A880                <1> 	test	al, 80h
   789 000126D8 740F                <1> 	jz	short sp_setp2
   790 000126DA C603E3              <1>         mov     byte [ebx], 0E3h ; Reset to initial value (11100011b)
   791                              <1> stp_dnr_err:
   792 000126DD C705[C8030300]0F00- <1> 	mov	dword [u.error], ERR_DEV_NOT_RDY ; 'device not ready !'
   792 000126E5 0000                <1>
   793                              <1> 	; CL = Line status, CH = Modem status
   794 000126E7 F9                  <1> 	stc
   795 000126E8 C3                  <1> 	retn
   796                              <1> sp_setp2:
   797 000126E9 80FE02              <1> 	cmp	dh, 2 ; COM2 (2F?h)
   798 000126EC 0F8649FFFFFF        <1>         jna     sp_i6 
   799                              <1> 		      ; COM1 (3F?h)
   800                              <1> sp_i5: 
   801                              <1> 	; 07/11/2015
   802                              <1> 	; 26/10/2015
   803                              <1> 	; 29/06/2015
   804                              <1> 	;
   805                              <1> 	;; COM1 - enabling IRQ 4
   806 000126F2 9C                  <1> 	pushf
   807 000126F3 FA                  <1> 	cli
   808 000126F4 66BAFC03            <1> 	mov	dx, 3FCh   		; modem control register
   809 000126F8 EC                  <1> 	in	al, dx 	   		; read register
   810 000126F9 EB00                <1> 	JMP	$+2			; I/O DELAY
   811 000126FB 0C08                <1> 	or	al, 8      		; enable bit 3 (OUT2)
   812 000126FD EE                  <1> 	out	dx, al     		; write back to register
   813 000126FE EB00                <1> 	JMP	$+2			; I/O DELAY
   814 00012700 66BAF903            <1> 	mov	dx, 3F9h   		; interrupt enable register
   815 00012704 EC                  <1> 	in	al, dx     		; read register
   816 00012705 EB00                <1> 	JMP	$+2			; I/O DELAY
   817                              <1> 	;or	al, 1      		; receiver data interrupt enable and
   818 00012707 0C03                <1> 	or	al, 3	   		; transmitter empty interrupt enable
   819 00012709 EE                  <1> 	out	dx, al 	   		; write back to register
   820 0001270A EB00                <1> 	JMP	$+2        		; I/O DELAY
   821 0001270C E421                <1> 	in	al, 21h    		; read interrupt mask register
   822 0001270E EB00                <1> 	JMP	$+2			; I/O DELAY
   823 00012710 24EF                <1> 	and	al, 0EFh   		; enable IRQ 4 (COM1)
   824 00012712 E621                <1> 	out	21h, al    		; write back to register
   825                              <1> 	;
   826                              <1> 	; 23/10/2015
   827 00012714 B8[24250100]        <1> 	mov 	eax, com1_int
   828 00012719 A3[36270100]        <1> 	mov	[com1_irq4], eax
   829                              <1> 	; 26/10/2015
   830 0001271E 9D                  <1> 	popf
   831 0001271F C3                  <1> 	retn
   832                              <1> 
   833                              <1> sp_invp_err:
   834 00012720 C705[C8030300]1700- <1> 	mov	dword [u.error], ERR_INV_PARAMETER ; 'invalid parameter !' 
   834 00012728 0000                <1>
   835 0001272A 31C9                <1> 	xor	ecx, ecx
   836 0001272C 49                  <1> 	dec	ecx ; 0FFFFh
   837 0001272D F9                  <1> 	stc
   838 0001272E C3                  <1> 	retn
   839                              <1> 
   840                              <1> ; 29/10/2015
   841                              <1> b_div_tbl: ; Baud rate divisor table (115200/divisor)
   842 0001272F 010C0603080401      <1> 	db 1, 12, 6, 3, 8, 4, 1
   843                              <1> 
   844                              <1> 
   845                              <1> ; 23/10/2015
   846                              <1> com1_irq4:
   847 00012736 [3E270100]          <1> 	dd dummy_retn
   848                              <1> com2_irq3:
   849 0001273A [3E270100]          <1> 	dd dummy_retn
   850                              <1> 
   851                              <1> dummy_retn:
   852 0001273E C3                  <1> 	retn
   853                              <1> 
   854                              <1> wakeup:
   855                              <1> 	; 24/01/2016
   856 0001273F C3                  <1> 	retn
   857                              <1> 
   858                              <1> set_working_path_x:
   859                              <1> 		; 17/10/2016 (TRDOS 386 - FFF & FNF)
   860 00012740 66B80100            <1> 		mov	ax, 1 
   861                              <1> 			; File name is needed/forced (AL=1)
   862                              <1> 			; Change directory as temporary (AH=0)	
   863                              <1> 
   864                              <1> set_working_path_xx: ; 30/12/2017 (syschdir)
   865                              <1> 		; This is needed for preventing wrong Find Next File
   866                              <1> 		; system call after sysopen, syscreate, sysmkdir etc. 
   867                              <1> 		; Find Next File must immediate follow Find First File)
   868                              <1> 
   869 00012744 8825[448E0100]      <1> 		mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
   870                              <1> 
   871                              <1> set_working_path:
   872                              <1> 		; 16/10/2016
   873                              <1> 		; 12/10/2016
   874                              <1> 		; 10/10/2016
   875                              <1> 		; 05/10/2016 - TRDOS 386 (TRDOS v2.0)
   876                              <1> 		;
   877                              <1> 		; TRDOS v1.0 (DIR.ASM, "proc_set_working_path")
   878                              <1>                 ; 27/01/2011 - 08/02/2011 
   879                              <1> 		; Set/Changes current drive, directory and file
   880                              <1> 		; depending on command tail
   881                              <1> 		; (procedure is derivated from CMD_INTR.ASM 
   882                              <1> 		; file or dir locating code of internal commands)
   883                              <1> 		; (This procedure is prepared for INT 21H file/dir 
   884                              <1> 		; functions and also to get compact code for 
   885                              <1> 		; internal mainprog -command interpreter- commands)
   886                              <1> 		; 
   887                              <1> 		; INPUT: DS:SI -> Command tail (ASCIIZ string)
   888                              <1> 		; AL = 0 -> any, AL > 0 -> file name is forced
   889                              <1> 		; AH = CD -> Change directory permanently 
   890                              <1> 		; AH <> CD -> Change directory as temporary    
   891                              <1> 		; 
   892                              <1> 		; OUTPUT: ES=DS, FindFile structure has been set
   893                              <1> 		;        RUN_CDRV points previous current drive  
   894                              <1> 		;        DS:SI = FindFile structure address
   895                              <1> 		;        (DS=CS)       
   896                              <1> 		;        AX, BX, CX, DX, DI will be changed
   897                              <1> 		;   cf = 1 -> Error code in AX (AL)
   898                              <1> 		;        stc & AX = 0 -> Bad command or path name 
   899                              <1> 		; -----------------------------------------------
   900                              <1> 		;
   901                              <1> 		; TRDOS 386 (05/10/2016)
   902                              <1> 		; INPUT:
   903                              <1> 		;	ESI = File/Directory Path (ASCIIZ string)
   904                              <1> 		;             address in user's memory space
   905                              <1> 		;       AL = 0 -> any
   906                              <1> 		;       AL > 0 -> file name is forced
   907                              <1> 		;       AH = CD -> change directory as permanent
   908                              <1> 		;       AH <> CD -> change directory as temporary
   909                              <1> 		; 
   910                              <1> 		; OUTPUT:
   911                              <1> 		;	FindFile structure has been set
   912                              <1> 		;       RUN_CDRV points previous current drive  
   913                              <1> 		;       ESI = FindFile_Name address ; 12/10/2016
   914                              <1> 		;
   915                              <1> 		;       cf = 1 -> Error code in EAX (AL)
   916                              <1> 		;       stc & EAX = 0 -> Bad command or path name
   917                              <1> 		;  
   918                              <1> 		; Modified registers: EAX, EBX, ECX, EDX, ESI, EDI
   919                              <1> 
   920 0001274A 66A3[488E0100]      <1> 		mov	[SWP_Mode], ax
   921 00012750 A0[56820100]        <1> 		mov	al, [Current_Drv]
   922 00012755 30E4                <1> 		xor	ah, ah
   923 00012757 66A3[4A8E0100]      <1> 		mov	[SWP_DRV], ax
   924                              <1> 
   925                              <1> 		; TRDOS 386 ring 3 (user's page directory)
   926                              <1> 		; to ring 0 (kernel's page directory) 
   927                              <1> 		; transfer modifications (05/10/2016).
   928                              <1> 
   929 0001275D 55                  <1> 		push	ebp
   930 0001275E 89E5                <1> 		mov	ebp, esp
   931                              <1> 		
   932 00012760 B980000000          <1> 		mov	ecx, 128 ; maximum path length = 128 bytes
   933 00012765 29CC                <1> 		sub	esp, ecx ; reserve 128 bytes (buffer) on stack
   934 00012767 89E7                <1> 		mov	edi, esp ; destination address (kernel space)
   935                              <1> 		; esi = source address (virtual, in user's memory space)
   936 00012769 E8A0EBFFFF          <1> 		call	transfer_from_user_buffer
   937 0001276E 720A                <1> 		jc	short loc_swp_xor_retn 
   938                              <1> 		
   939 00012770 89E6                <1> 		mov	esi, esp ; temporary buffer (the path) on stack
   940                              <1> loc_swp_fchar:
   941 00012772 8A06                <1> 		mov	al, [esi]
   942 00012774 3C20                <1> 		cmp	al, 20h
   943 00012776 7711                <1> 		ja	short loc_swp_parse_path_name
   944 00012778 740C                <1> 		je	short loc_swp_fchar_next
   945                              <1> 
   946                              <1> loc_swp_xor_retn:
   947 0001277A 31C0                <1> 		xor	eax, eax
   948 0001277C F9                  <1> 		stc
   949                              <1> loc_swp_retn:
   950 0001277D 89EC                <1> 		mov	esp, ebp
   951 0001277F 5D                  <1> 		pop	ebp
   952                              <1> 
   953                              <1> 		;mov	esi, FindFile_Drv
   954 00012780 BE[388B0100]        <1> 		mov	esi, FindFile_Name ; 12/10/2016
   955 00012785 C3                  <1> 		retn 
   956                              <1> 
   957                              <1> loc_swp_fchar_next:
   958 00012786 46                  <1> 		inc	esi
   959 00012787 EBE9                <1> 		jmp	short loc_swp_fchar  
   960                              <1> 
   961                              <1> loc_swp_parse_path_name:
   962 00012789 BF[F68A0100]        <1> 		mov	edi, FindFile_Drv
   963 0001278E E8AF8EFFFF          <1> 		call	parse_path_name
   964 00012793 72E8                <1> 		jc	short loc_swp_retn
   965                              <1> 
   966                              <1> loc_swp_checkfile_name:
   967 00012795 803D[488E0100]00    <1> 		cmp	byte [SWP_Mode], 0
   968 0001279C 761E                <1> 		jna	short loc_swp_drv
   969                              <1> 
   970                              <1> 		; 10/10/2016 (valid file name checking)
   971 0001279E BE[388B0100]        <1> 		mov	esi, FindFile_Name
   972 000127A3 803E20              <1> 		cmp	byte [esi], 20h
   973 000127A6 76D2                <1> 		jna	short loc_swp_xor_retn
   974                              <1> 
   975                              <1> 		; 16/10/2016
   976 000127A8 C605[478E0100]00    <1> 		mov	byte [SWP_inv_fname], 0 ; reset 
   977                              <1> 		; esi = file name address (ASCIIZ)
   978 000127AF E87B70FFFF          <1> 		call	check_filename
   979 000127B4 7306                <1> 		jnc	short loc_swp_drv
   980                              <1> 
   981 000127B6 FE05[478E0100]      <1> 		inc	byte [SWP_inv_fname] ; set 	
   982                              <1> loc_swp_drv:
   983 000127BC 8A35[56820100]      <1> 		mov	dh, [Current_Drv]
   984                              <1>                ;mov	[RUN_CDRV], dh
   985                              <1> 
   986 000127C2 8A15[F68A0100]      <1> 		mov	dl, [FindFile_Drv]
   987                              <1>                ;cmp	dl, dh
   988 000127C8 3A15[56820100]      <1> 		cmp	dl, [Current_Drv]
   989 000127CE 740D                <1> 		je	short loc_swp_change_directory
   990                              <1> 
   991 000127D0 FE05[4B8E0100]      <1> 		inc	byte [SWP_DRV_chg]
   992 000127D6 E8F358FFFF          <1> 		call	change_current_drive
   993 000127DB 72A0                <1> 		jc	short loc_swp_retn ; eax = error code
   994                              <1> 		; eax = 0
   995                              <1> 
   996                              <1> loc_swp_change_directory:
   997 000127DD 803D[F78A0100]21    <1> 		cmp	byte [FindFile_Directory], 21h
   998 000127E4 F5                  <1> 		cmc
   999 000127E5 7396                <1> 		jnc	short loc_swp_retn
  1000                              <1> 
  1001 000127E7 FE05[4B8E0100]      <1> 		inc	byte [SWP_DRV_chg]
  1002 000127ED FE05[23380100]      <1> 		inc	byte [Restore_CDIR]
  1003 000127F3 BE[F78A0100]        <1> 		mov	esi, FindFile_Directory
  1004 000127F8 8A25[498E0100]      <1> 		mov	ah, [SWP_Mode+1] 
  1005 000127FE E82988FFFF          <1> 		call	change_current_directory
  1006 00012803 0F8274FFFFFF        <1> 		jc	loc_swp_retn ; eax = error code
  1007                              <1> 
  1008                              <1> loc_swp_change_prompt_dir_string:
  1009                              <1> 		; esi = PATH_Array
  1010                              <1> 		; eax = Current Directory First Cluster
  1011                              <1> 		; edi = Logical DOS Drive Description Table	
  1012 00012809 E84387FFFF          <1> 		call	change_prompt_dir_str 
  1013 0001280E 29C0                <1> 		sub	eax, eax ; 0
  1014 00012810 E968FFFFFF          <1> 		jmp	loc_swp_retn 
  1015                              <1> 
  1016                              <1> reset_working_path:
  1017                              <1> 		; 06/10/2016 - TRDOS 386 (TRDOS v2.0)
  1018                              <1> 		;
  1019                              <1> 		; TRDOS v1.0 (DIR.ASM, "proc_reset_working_path")
  1020                              <1> 		; 05/02/2011 - 08/02/2011 
  1021                              <1> 		;
  1022                              <1> 		; Restores current drive and directory 
  1023                              <1> 		; 
  1024                              <1> 		; INPUT: none
  1025                              <1> 		; OUTPUT: DL = SWP_DRV, EAX = 0 -> OK
  1026                              <1> 		;
  1027                              <1> 		;    AX = 0 -> ESI = Logical Dos Drv Desc. Table
  1028                              <1> 		;
  1029                              <1> 		;    EAX, EBX, ECX, EDX, ESI, EDI will be changed
  1030                              <1> 		;
  1031                              <1> 
  1032                              <1>   
  1033 00012815 31C0                <1> 		xor	eax, eax
  1034 00012817 48                  <1> 		dec	eax 
  1035                              <1> 
  1036 00012818 668B15[4A8E0100]    <1> 		mov	dx, [SWP_DRV]
  1037 0001281F 08F6                <1> 		or	dh, dh
  1038 00012821 742E                <1> 		jz	short loc_rwp_return
  1039                              <1> 
  1040 00012823 3A15[56820100]      <1> 		cmp	dl, [Current_Drv]
  1041 00012829 7407                <1> 		je	short loc_rwp_restore_cdir
  1042                              <1> loc_rwp_restore_cdrv:
  1043 0001282B E89E58FFFF          <1> 		call	change_current_drive 
  1044 00012830 EB10                <1> 		jmp	short loc_rwp_restore_ok
  1045                              <1> loc_rwp_restore_cdir:
  1046 00012832 31DB                <1> 		xor	ebx, ebx
  1047 00012834 88D7                <1> 		mov	bh, dl
  1048 00012836 BE00010900          <1> 		mov	esi, Logical_DOSDisks
  1049 0001283B 01DE                <1> 		add	esi, ebx
  1050                              <1> 
  1051 0001283D E84359FFFF          <1> 		call	restore_current_directory
  1052                              <1> 
  1053                              <1> loc_rwp_restore_ok:
  1054 00012842 668B15[4A8E0100]    <1> 		mov	dx, [SWP_DRV]
  1055 00012849 31C0                <1> 		xor	eax, eax  
  1056 0001284B 66A3[4B8E0100]      <1> 		mov	[SWP_DRV_chg], ax
  1057                              <1> loc_rwp_return:
  1058 00012851 C3                  <1> 		retn
  1059                              <1> 
  1060                              <1> get_file_name:
  1061                              <1> 		; 15/10/2016 - TRDOS 386 (TRDOS v2.0)
  1062                              <1> 		; Convert file name 
  1063                              <1> 		;	from directory entry format
  1064                              <1>                 ; 	to (8.3) dot file name format 
  1065                              <1> 		;
  1066                              <1> 		; TRDOS v1.0 (DIR.ASM, "get_file_name")
  1067                              <1>                 ; 2005 - 09/10/2011 	
  1068                              <1> 		; INPUT: 
  1069                              <1> 		;	DS:SI -> Directory Entry Format File Name
  1070                              <1> 		;       ES:DI -> DOS Dot File Name Address
  1071                              <1> 		; OUTPUT:
  1072                              <1> 		;	DS:SI -> DOS Dot File Name Address
  1073                              <1>                 ;	ES:DI -> Directory Entry Format File Name
  1074                              <1> 		;	
  1075                              <1> 		; TRDOS 386 (15/10/2016)
  1076                              <1> 		; INPUT:
  1077                              <1> 		;	ESI = File name addr in dir entry format
  1078                              <1> 		;	EDI = Dot file name address (destination)
  1079                              <1> 		; OUTPUT: 
  1080                              <1> 		;	File name is converted and moved
  1081                              <1> 		;	to destination (as 8.3 dot filename)
  1082                              <1> 		;  
  1083                              <1> 		; Modified registers: EAX, ECX
  1084                              <1> 
  1085                              <1>                 ; 2005 (TRDOS 8086) - 2016 (TRDOS 386)
  1086                              <1>                             
  1087 00012852 57                  <1> 		push	edi
  1088 00012853 56                  <1> 		push	esi
  1089 00012854 AC                  <1> 		lodsb
  1090 00012855 3C20                <1> 		cmp	al, 20h
  1091 00012857 762A                <1> 		jna	short pass_gfn_ext
  1092 00012859 56                  <1> 		push	esi
  1093 0001285A AA                  <1> 		stosb
  1094 0001285B B907000000          <1> 		mov	ecx, 7
  1095                              <1> loc_gfn_next_char:
  1096 00012860 AC                  <1> 		lodsb
  1097 00012861 3C20                <1> 		cmp	al, 20h
  1098 00012863 7603                <1> 		jna	short pass_gfn_fn
  1099 00012865 AA                  <1> 		stosb
  1100 00012866 E2F8                <1> 		loop	loc_gfn_next_char
  1101                              <1> pass_gfn_fn:
  1102 00012868 5E                  <1> 		pop	esi
  1103 00012869 83C607              <1> 		add	esi, 7
  1104 0001286C AC                  <1> 		lodsb
  1105 0001286D 3C20                <1> 		cmp	al, 20h
  1106 0001286F 7612                <1> 		jna	short pass_gfn_ext
  1107 00012871 B42E                <1> 		mov	ah, '.'
  1108 00012873 86E0                <1> 		xchg	ah, al
  1109 00012875 66AB                <1> 		stosw
  1110 00012877 AC                  <1> 		lodsb
  1111 00012878 3C20                <1> 		cmp	al, 20h
  1112 0001287A 7607                <1> 		jna	short pass_gfn_ext
  1113 0001287C AA                  <1> 		stosb
  1114 0001287D AC                  <1> 		lodsb
  1115 0001287E 3C20                <1> 		cmp	al, 20h
  1116 00012880 7601                <1> 		jna	short pass_gfn_ext
  1117 00012882 AA                  <1> 		stosb
  1118                              <1> pass_gfn_ext:		
  1119 00012883 30C0                <1> 		xor	al, al
  1120 00012885 AA                  <1> 		stosb
  1121 00012886 5E                  <1> 		pop	esi
  1122 00012887 5F                  <1> 		pop	edi
  1123 00012888 C3                  <1> 		retn
  1124                              <1> 
  1125                              <1> set_hardware_int_vector:
  1126                              <1> 		; 18/03/2017
  1127                              <1> 		; 03/03/2017
  1128                              <1> 		; 28/02/2017 - TRDOS 386 (TRDOS v2.0)
  1129                              <1> 		;
  1130                              <1> 		; SET/RESET HARDWARE INTERRUPT GATE
  1131                              <1> 		;
  1132                              <1> 		; Changes interrupt gate descriptor table
  1133                              <1> 		; (without changing default interrupt list)
  1134                              <1> 		;
  1135                              <1> 		; INPUT:
  1136                              <1> 		;	AL = IRQ number (0 to 15)
  1137                              <1> 		;	AH > 0 -> set
  1138                              <1> 		;	AH = 0 -> reset
  1139                              <1> 		;	
  1140                              <1> 		; Modified registers: eax, ebx, edx, edi 
  1141                              <1> 		;
  1142                              <1> 		
  1143 00012889 C0E002              <1> 		shl	al, 2 ; IRQ number * 4
  1144 0001288C 0FB6D8              <1> 		movzx	ebx, al
  1145                              <1> 
  1146 0001288F 08E4                <1> 		or	ah, ah
  1147 00012891 7508                <1> 		jnz	short shintv_1 ; set (for user call service)
  1148                              <1> 		
  1149                              <1> 		; 18/03/2017
  1150 00012893 81C3[20420100]      <1> 		add	ebx, IRQ_list ; reset to default interrupt list
  1151 00012899 EB06                <1> 		jmp	short shintv_2
  1152                              <1> shintv_1:
  1153 0001289B 81C3[C2280100]      <1> 		add	ebx, IRQ_u_list
  1154                              <1> shintv_2:	
  1155 000128A1 8B13                <1> 		mov	edx, [ebx] ; IRQ handler address
  1156                              <1> 		
  1157                              <1> 		; 03/03/2017
  1158 000128A3 D0E0                <1> 		shl	al, 1 ; IRQ number * 8 
  1159                              <1> 		; 18/03/2017
  1160 000128A5 0FB6F8              <1> 		movzx	edi, al 
  1161 000128A8 81C7[A87F0100]      <1> 		add	edi, idt + (8*32) ; IRQ 0 offset = idt + 256
  1162                              <1> 		
  1163 000128AE 89D0                <1> 		mov	eax, edx ; IRQ handler address
  1164 000128B0 BB00000800          <1> 		mov	ebx, 80000h
  1165                              <1> 
  1166                              <1> 		;mov	edx, eax
  1167 000128B5 66BA008E            <1> 		mov	dx, 8E00h
  1168 000128B9 6689C3              <1> 		mov	bx, ax
  1169 000128BC 89D8                <1> 		mov	eax, ebx ; /* selector = 0x0008 = cs */
  1170                              <1>        			         ; /* interrupt gate - dpl=0, present */
  1171 000128BE AB                  <1> 		stosd	; selector & offset bits 0-15 	
  1172 000128BF 8917                <1> 		mov	[edi], edx ; attributes & offset bits 16-23
  1173                              <1> 
  1174 000128C1 C3                  <1> 		retn
  1175                              <1> IRQ_u_list:
  1176                              <1> 		; 28/02/2017
  1177 000128C2 [56090000]          <1> 		dd	timer_int
  1178 000128C6 [CE100000]          <1> 		dd	kb_int
  1179 000128CA [380B0000]          <1> 		dd	irq2
  1180 000128CE [02290100]          <1> 		dd	IRQ_service3
  1181 000128D2 [0C290100]          <1> 		dd	IRQ_service4
  1182 000128D6 [16290100]          <1> 		dd	IRQ_service5
  1183 000128DA [C9510000]          <1> 		dd	fdc_int	
  1184 000128DE [20290100]          <1> 		dd	IRQ_service7
  1185 000128E2 [C10A0000]          <1> 		dd	rtc_int
  1186 000128E6 [2A290100]          <1> 		dd	IRQ_service9
  1187 000128EA [34290100]          <1> 		dd	IRQ_service10
  1188 000128EE [3E290100]          <1> 		dd	IRQ_service11
  1189 000128F2 [48290100]          <1> 		dd	IRQ_service12
  1190 000128F6 [52290100]          <1> 		dd	IRQ_service13
  1191 000128FA [7C5B0000]          <1> 		dd	hdc1_int
  1192 000128FE [A35B0000]          <1> 		dd	hdc2_int
  1193                              <1> 
  1194                              <1> 		; 03/03/2017
  1195                              <1> 		; 27/02/2017
  1196                              <1> IRQ_service3:
  1197 00012902 36C605[0E940100]03  <1> 		mov	byte [ss:IRQnum], 3
  1198 0001290A EB4E                <1> 		jmp	short IRQ_service
  1199                              <1> IRQ_service4:
  1200 0001290C 36C605[0E940100]04  <1> 		mov	byte [ss:IRQnum], 4
  1201 00012914 EB44                <1> 		jmp	short IRQ_service
  1202                              <1> IRQ_service5:
  1203 00012916 36C605[0E940100]05  <1> 		mov	byte [ss:IRQnum], 5
  1204 0001291E EB3A                <1> 		jmp	short IRQ_service
  1205                              <1> IRQ_service7:
  1206 00012920 36C605[0E940100]07  <1> 		mov	byte [ss:IRQnum], 7
  1207 00012928 EB30                <1> 		jmp	short IRQ_service
  1208                              <1> IRQ_service9:
  1209 0001292A 36C605[0E940100]09  <1> 		mov	byte [ss:IRQnum], 9
  1210 00012932 EB26                <1> 		jmp	short IRQ_service
  1211                              <1> IRQ_service10:
  1212 00012934 36C605[0E940100]0A  <1> 		mov	byte [ss:IRQnum], 10
  1213 0001293C EB1C                <1> 		jmp	short IRQ_service
  1214                              <1> IRQ_service11:
  1215 0001293E 36C605[0E940100]0B  <1> 		mov	byte [ss:IRQnum], 11
  1216 00012946 EB12                <1> 		jmp	short IRQ_service
  1217                              <1> IRQ_service12:
  1218 00012948 36C605[0E940100]0C  <1> 		mov	byte [ss:IRQnum], 12
  1219 00012950 EB08                <1> 		jmp	short IRQ_service
  1220                              <1> IRQ_service13:
  1221 00012952 36C605[0E940100]0D  <1> 		mov	byte [ss:IRQnum], 13
  1222                              <1> 		;jmp	short IRQ_service
  1223                              <1> IRQ_service:
  1224                              <1> 		; 13/06/2017
  1225                              <1> 		; 11/06/2017
  1226                              <1> 		; 10/06/2017
  1227                              <1> 		; 01/03/2017, 04/03/2017
  1228                              <1> 		; 27/02/2017, 28/02/2017
  1229 0001295A 1E                  <1> 		push	ds
  1230 0001295B 06                  <1> 		push	es
  1231 0001295C 0FA0                <1> 		push	fs
  1232 0001295E 0FA8                <1> 		push	gs
  1233                              <1> 
  1234 00012960 60                  <1> 		pushad	; eax,ecx,edx,ebx,esp,ebp,esi,edi
  1235 00012961 66B91000            <1> 		mov     cx, KDATA
  1236 00012965 8ED9                <1>         	mov     ds, cx
  1237 00012967 8EC1                <1>         	mov     es, cx
  1238 00012969 8EE1                <1>         	mov     fs, cx
  1239 0001296B 8EE9                <1>         	mov     gs, cx
  1240                              <1> 
  1241 0001296D 0F20D8              <1> 		mov	eax, cr3
  1242 00012970 A3[0A940100]        <1> 		mov	[IRQ_cr3], eax
  1243                              <1> 
  1244 00012975 A1[90810100]        <1> 		mov	eax, [k_page_dir]
  1245 0001297A 0F22D8              <1> 		mov	cr3, eax 
  1246                              <1> 
  1247 0001297D A0[0E940100]        <1> 		mov	al, [IRQnum]
  1248                              <1> 
  1249                              <1> 		;mov	cl, [sysflg]
  1250                              <1> 		;mov	[u.r_mode], cl  ; system (0) or user mode (FFh) 
  1251                              <1> IRQsrv_0:
  1252 00012982 0FB6D8              <1> 		movzx	ebx, al
  1253 00012985 8A9B[58410100]      <1> 		mov	bl, [ebx+IRQenum] ; IRQ (available) index number + 1
  1254                              <1> 		; 01/03/2017
  1255 0001298B FECB                <1> 		dec	bl  ; IRQ index number, 0 to 8
  1256 0001298D 0F8807010000        <1> 		js	IRQsrv_5 ; not available to use here!?
  1257                              <1> 		;		 
  1258 00012993 80BB[D4930100]80    <1> 		cmp	byte [ebx+IRQ.method], 80h ; using by a dev or kernel? 
  1259 0001299A 7205                <1> 		jb	short IRQsrv_1 ; no
  1260                              <1> 
  1261                              <1> 		; If the IRQ service is already owned by TRDOS 386 kernel
  1262                              <1> 		;	 or a Device driver
  1263                              <1> 		; we need to call 'dev_IRQ_service'
  1264                              <1> 
  1265                              <1> 		; IRQ number in AL
  1266 0001299C E866020000          <1> 		call	dev_IRQ_service	 ; IRQ service for device drivers	
  1267                              <1> 		; IRQ number in AL
  1268                              <1> IRQsrv_1:		
  1269                              <1> 		; check user callback service status
  1270                              <1> 		; AL = IRQ number
  1271                              <1> 		; EBX = IRQ (Available) Index number
  1272                              <1> 
  1273 000129A1 A2[D7030300]        <1> 		mov	[u.irqwait], al ; set waiting IRQ flag
  1274                              <1> 
  1275 000129A6 8A83[C2930100]      <1> 		mov	al, [ebx+IRQ.owner]
  1276 000129AC 20C0                <1> 		and	al, al
  1277 000129AE 0F84E6000000        <1> 		jz	IRQsrv_5 ; it is not owned by a user/proc
  1278                              <1> 
  1279                              <1> 		; 03/03/2017
  1280 000129B4 89DA                <1> 		mov	edx, ebx
  1281 000129B6 C0E202              <1> 		shl	dl, 2
  1282 000129B9 8B92[E6930100]      <1> 		mov	edx, [edx+IRQ.addr] ; S.R.B. or Callback service addr
  1283                              <1> 		
  1284 000129BF 8AA3[D4930100]      <1> 		mov	ah, [ebx+IRQ.method]
  1285 000129C5 F6C401              <1> 		test	ah, 1
  1286 000129C8 7534                <1> 		jnz	short IRQsrv_4 ; Callback service method
  1287                              <1> 
  1288                              <1> 		; Signal Response Byte method
  1289                              <1> 		;mov	edx, [edx+IRQ.addr] ; Signal Response Byte address
  1290                              <1> 		;			    ; (Physical address, non-swappable) 	
  1291 000129CA 80E402              <1> 		and	ah, 2 ; bit 1, (S.R.B.) counter (auto increment) method
  1292 000129CD 8AA3[DD930100]      <1> 		mov	ah, [ebx+IRQ.srb] ; Signal Response Byte value
  1293 000129D3 7408                <1> 		jz	short IRQsrv_2 ; fixed S.R.B. value
  1294                              <1> 		; counter method (auto increment)
  1295 000129D5 FEC4                <1> 		inc	ah
  1296 000129D7 88A3[DD930100]      <1> 		mov	[ebx+IRQ.srb], ah ; next (count) number
  1297                              <1> IRQsrv_2:
  1298 000129DD 8822                <1> 		mov	[edx], ah ; put S.R.B. val to the user's S.R.B. addr
  1299 000129DF C605[D7030300]00    <1> 		mov	byte [u.irqwait], 0 ; clear waiting IRQ flag
  1300                              <1> 
  1301 000129E6 3A05[B3030300]      <1> 		cmp	al, [u.uno]
  1302 000129EC 0F84A8000000        <1> 		je	IRQsrv_5 ; the owner is current user/process
  1303                              <1> IRQsrv_3:
  1304                              <1> 		; the owner is not current user/process
  1305                              <1> 		; AL = process number
  1306 000129F2 B202                <1> 		mov	dl, 2 ; priority, 2 = event (high)	
  1307 000129F4 E837FAFFFF          <1> 		call	set_run_sequence
  1308                              <1> 
  1309                              <1> 		; [u.irqwait] = waiting IRQ number for callback service
  1310                              <1> 
  1311 000129F9 E99C000000          <1> 		jmp	IRQsrv_5
  1312                              <1> IRQsrv_4:
  1313 000129FE 3A05[B3030300]      <1> 		cmp	al, [u.uno]  ; is the owner is current user/process?
  1314 00012A04 75EC                <1> 		jne	short IRQsrv_3 ; no !
  1315                              <1> 
  1316                              <1> 		; Check if an IRQ callback service already in progress
  1317 00012A06 803D[D8030300]00    <1> 		cmp	byte [u.r_lock], 0
  1318 00012A0D 0F8787000000        <1> 		ja	IRQsrv_5 ; nothing to do !  
  1319                              <1> 				     ; (we need to complete prev callback)
  1320 00012A13 803D[D4030300]00    <1> 		cmp	byte [u.t_lock], 0
  1321 00012A1A 777E                <1> 		ja	short IRQsrv_5 ; nothing to do !  
  1322                              <1> 				     ; (we need to complete timer callback)
  1323                              <1> 
  1324                              <1> 		; 04/03/2017
  1325 00012A1C C605[D7030300]00    <1> 		mov	byte [u.irqwait], 0 ; reset/clear waiting IRQ flag
  1326                              <1> 
  1327 00012A23 FE05[D8030300]      <1> 		inc	byte [u.r_lock] ; 'IRQ callback service in progress' flag
  1328                              <1> 
  1329 00012A29 8A0D[5B030300]      <1> 		mov	cl, [sysflg]   ; (system call) mode flag (kernel/user)
  1330 00012A2F 880D[D9030300]      <1> 		mov	[u.r_mode], cl ; system mode (0) or user mode (FFh)
  1331                              <1> 
  1332                              <1> 		; 
  1333 00012A35 8B2D[2C810100]      <1> 		mov	ebp, [tss.esp0] ; kernel stack address (for ring 0)
  1334 00012A3B 83ED14              <1> 		sub	ebp, 20		; eip, cs, eflags, esp, ss
  1335 00012A3E 892D[5C030300]      <1> 	 	mov	[u.sp], ebp
  1336 00012A44 8925[60030300]      <1> 		mov	[u.usp], esp
  1337                              <1> 
  1338                              <1> 		;or	word [ebp+8], 200h ; 22/01/2017, force enabling interrupts
  1339                              <1> 
  1340 00012A4A 8B44241C            <1> 		mov	eax, [esp+28] ; pushed eax
  1341 00012A4E A3[64030300]        <1> 		mov	[u.r0], eax
  1342                              <1> 
  1343 00012A53 E820E7FFFF          <1> 		call	wswap ; save user's registers & status
  1344                              <1> 
  1345                              <1> 		; software int is in ring 0 but IRQ handler must return to ring 3
  1346                              <1> 		; so, ring 3 return address and stack registers
  1347                              <1> 		; (eip, cs, eflags, esp, ss) 
  1348                              <1> 		; must be copied to IRQ handler return
  1349                              <1> 		; eip will be replaced by callback service routine address
  1350                              <1> 
  1351 00012A58 C605[5B030300]FF    <1> 		mov	byte [sysflg], 0FFh ; user mode
  1352                              <1> 
  1353                              <1> 		; system mode (system call)
  1354                              <1> 		;mov	ebp, [u.sp] ; EIP (u), CS (UCODE), EFLAGS (u),
  1355                              <1> 				    ; ESP (u), SS (UDATA)
  1356                              <1> 
  1357 00012A5F 8B4510              <1> 		mov	eax, [ebp+16]	; SS (UDATA)
  1358 00012A62 89E6                <1> 		mov	esi, esp
  1359 00012A64 50                  <1> 		push	eax
  1360 00012A65 50                  <1> 		push	eax
  1361 00012A66 89E7                <1> 		mov	edi, esp
  1362 00012A68 893D[60030300]      <1> 		mov	[u.usp], edi
  1363 00012A6E B908000000          <1> 		mov	ecx, ((ESPACE/4) - 4) ; except DS, ES, FS, GS
  1364 00012A73 F3A5                <1> 		rep	movsd
  1365 00012A75 B104                <1> 		mov	cl, 4	
  1366 00012A77 F3AB                <1> 		rep	stosd
  1367 00012A79 893D[5C030300]      <1> 		mov	[u.sp], edi
  1368 00012A7F 89EE                <1> 		mov	esi, ebp
  1369 00012A81 B105                <1> 		mov	cl, 5 ; EIP (u), CS (UCODE), EFLAGS (u), ESP (u), SS (UDATA)
  1370 00012A83 F3A5                <1> 		rep	movsd
  1371                              <1> 		;
  1372                              <1> 
  1373 00012A85 8B0D[B8030300]      <1> 		mov	ecx, [u.pgdir]
  1374 00012A8B 890D[0A940100]      <1> 		mov	[IRQ_cr3], ecx
  1375                              <1> 
  1376                              <1> set_IRQ_callback_addr:
  1377                              <1> 		;
  1378                              <1> 		; This routine sets return address
  1379                              <1> 		; to start of user's interrupt
  1380                              <1> 		; service (callback) address
  1381                              <1> 		;
  1382                              <1> 		; INPUT:
  1383                              <1> 		;	EDX = callback routine/service address
  1384                              <1> 		;	      (virtual, not physical address!)	
  1385                              <1> 		;	[u.sp] = kernel stack, points to
  1386                              <1> 		;		 user's EIP,CS,EFLAGS,ESP,SS
  1387                              <1> 		;		 registers.
  1388                              <1> 		; OUTPUT:
  1389                              <1> 		;	EIP (user) = callback (service) address
  1390                              <1> 		;	CS (user) = UCODE
  1391                              <1> 		;	EFLAGS (user) = flags before callback 	 
  1392                              <1> 		;       ESP (user) = ESP-4 (user, before callback) 
  1393                              <1> 		;	[ESP](user) = EIP (user) before callback
  1394                              <1> 		;
  1395                              <1> 		; Note: If CPU was in user mode while entering 
  1396                              <1> 		;	the timer interrupt service routine,
  1397                              <1> 		;	'IRET' will get return to callback routine
  1398                              <1> 		;	immediately. If CPU was in system/kernel mode  
  1399                              <1> 		;	'iret' will get return to system call and
  1400                              <1> 		;	then, callback routine will be return address
  1401                              <1> 		;	from system call. (User's callback/service code
  1402                              <1> 		;	will be able to return to normal return address
  1403                              <1> 		;	via a 'sysrele' system call at the end.) 
  1404                              <1> 		;
  1405                              <1> 		; Note: User's IRQ callback service code must be ended
  1406                              <1> 		;	with a 'sysrele' system call !
  1407                              <1> 		;
  1408                              <1> 		;	For example:
  1409                              <1> 		;
  1410                              <1> 		;	audio_IRQ_callback:
  1411                              <1> 		;	    ...	 
  1412                              <1> 		;	    <load DMA buffer with audio data>
  1413                              <1> 		;	    ...
  1414                              <1> 		;	    mov eax, 39 ; 'sysrele'
  1415                              <1> 		;	    int 40h ; TRDOS 386 system call (interrupt)		
  1416                              <1> 		;
  1417                              <1> 		
  1418                              <1> 		;mov	edx, [edx+IRQ.addr] ; Callback service address
  1419                              <1> 		;			    ; (Virtual address)
  1420                              <1> 		
  1421 00012A91 8B2D[5C030300]      <1> 		mov	ebp, [u.sp]; kernel's stack, points to EIP (user)
  1422 00012A97 895500              <1> 		mov	[ebp], edx
  1423                              <1> IRQsrv_5:
  1424                              <1> 		; EOI & return
  1425                              <1> 		; 01/08/2020
  1426                              <1> 		; 11/06/2017
  1427                              <1> 		; 10/06/2017 
  1428                              <1> 		;mov	al, [IRQnum]
  1429 00012A9A B020                <1> 		mov	al, 20h ; 01/08/2020
  1430 00012A9C FA                  <1> 		cli
  1431                              <1> 		;cmp	al, 7
  1432 00012A9D 803D[0E940100]07    <1> 		cmp	byte [IRQnum], 7 ; 01/08/2020	
  1433 00012AA4 7602                <1> 		jna	short IRQsrv_6
  1434                              <1> 		;
  1435                              <1> 		;;mov	al, EOI	; end of interrupt
  1436                              <1> 		;mov	al, 20h ; 01/08/2020
  1437                              <1> 		;cli		; disable interrupts till stack cleared
  1438                              <1> 		;out	INTB00, al ; For controll2 #2
  1439 00012AA6 E6A0                <1> 		out	0A0h, al
  1440                              <1> IRQsrv_6:
  1441                              <1> 		;mov	byte [IRQnum], 0 ; reset
  1442                              <1> 		;;mov	al, EOI	; end of interrupt
  1443                              <1> 		;mov	al, 20h ; 01/08/2020
  1444                              <1> 		;cli		; disable interrupts till stack cleared
  1445                              <1> 		;out	INTA00, al ; end of interrupt to 8259 - 1
  1446 00012AA8 E620                <1> 		out	20h, al	
  1447                              <1> IRQsrv_7:	
  1448                              <1> 		;; 13/06/2017
  1449                              <1> 		;or	word [ebp+8], 200h ; force enabling interrupts
  1450                              <1> 		;
  1451 00012AAA 8B0D[0A940100]      <1> 		mov 	ecx, [IRQ_cr3]	; previous content of cr3 register
  1452 00012AB0 0F22D9              <1>  		mov	cr3, ecx	; restore cr3 register content
  1453                              <1> 		;
  1454 00012AB3 61                  <1> 		popad ; edi,esi,ebp,(icrement esp by 4),ebx,edx,ecx,eax
  1455                              <1> 		;
  1456 00012AB4 0FA9                <1> 		pop	gs
  1457 00012AB6 0FA1                <1> 		pop	fs
  1458 00012AB8 07                  <1> 		pop	es
  1459 00012AB9 1F                  <1> 		pop	ds
  1460                              <1> 		;
  1461 00012ABA CF                  <1> 		iretd	; return from interrupt
  1462                              <1> 
  1463                              <1> get_device_number:
  1464                              <1> 		; 08/10/2016
  1465                              <1> 		; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1466                              <1> 		;
  1467                              <1> 		; This procedure compares name of requested
  1468                              <1> 		; device with kernel device names and
  1469                              <1> 		; installable device names. If names match, 
  1470                              <1> 		; the relevant device index (entry) number 
  1471                              <1> 		; will be returned the caller (sysopen) 
  1472                              <1> 		; for the requested device.
  1473                              <1> 		;
  1474                              <1> 		; NOTE: Installable device drivers must
  1475                              <1> 		; be loaded before using 'sysopen'
  1476                              <1> 		; (opendev) system call.
  1477                              <1> 		;
  1478                              <1> 		; INPUT:
  1479                              <1> 		;    ESI = device name address (ASCIIZ)
  1480                              <1> 		;         (in kernel's memory space)  
  1481                              <1>    		;    max name length = 8 without '/dev/')
  1482                              <1> 		;    Device name will be capitalized 
  1483                              <1> 		;    and if there is, '/dev/' will be
  1484                              <1> 		;    removed from name before comparising)
  1485                              <1> 		;
  1486                              <1> 		; OUTPUT:
  1487                              <1> 		;    cf = 0 -> 
  1488                              <1> 		;      EAX (AL) = device entry/index number 	 	
  1489                              <1> 		;    cf = 1 -> device not found (installed)
  1490                              <1> 		;	       or invalid device name
  1491                              <1> 		;	       (AL=0)
  1492                              <1> 		;    device_name = device name address (asciiz)
  1493                              <1> 			;
  1494                              <1> 		; Modified registers: EAX, EBX, ESI, EDI
  1495                              <1> 
  1496 00012ABB BF[4D8E0100]        <1> 		mov	edi, device_name
  1497 00012AC0 E805010000          <1> 		call 	lodsb_capitalize
  1498 00012AC5 88C4                <1> 		mov	ah, al
  1499 00012AC7 3C2F                <1> 		cmp	al, '/'
  1500 00012AC9 750E                <1> 		jne	short gdn_1
  1501 00012ACB BF[4D8E0100]        <1> 		mov	edi, device_name
  1502 00012AD0 E8F5000000          <1> 		call 	lodsb_capitalize
  1503                              <1> gdn_0:
  1504 00012AD5 20C0                <1> 		and	al, al ; 0 ?
  1505 00012AD7 7420                <1> 		jz	short gdn_err ; null name after '/'
  1506                              <1> gdn_1:
  1507 00012AD9 3C44                <1> 		cmp	al, 'D'
  1508 00012ADB 7517                <1> 		jne	short gdn_2
  1509 00012ADD E8E8000000          <1> 		call 	lodsb_capitalize
  1510 00012AE2 3C45                <1> 		cmp	al, 'E'
  1511 00012AE4 750E                <1> 		jne	short gdn_2
  1512 00012AE6 E8DF000000          <1> 		call 	lodsb_capitalize
  1513 00012AEB 3C56                <1> 		cmp	al, 'V'
  1514 00012AED 7505                <1> 		jne	short gdn_2			
  1515 00012AEF AC                  <1> 		lodsb
  1516 00012AF0 3C2F                <1> 		cmp	al, '/'
  1517 00012AF2 740D                <1> 		je	short gdn_4
  1518                              <1> gdn_2:
  1519 00012AF4 80FC2F              <1> 		cmp	ah, '/'
  1520 00012AF7 750F                <1> 		jne	short gdn_5
  1521                              <1> gdn_err:		
  1522                              <1> 		; invalid device name or device not found
  1523 00012AF9 31C0                <1> 		xor	eax, eax ; 0
  1524 00012AFB F9                  <1> 		stc
  1525 00012AFC C3                  <1> 		retn
  1526                              <1> gdn_3:
  1527 00012AFD 3C2F                <1> 		cmp	al, '/'
  1528 00012AFF 7507                <1> 		jne	short gdn_5
  1529                              <1> gdn_4:
  1530 00012B01 BF[4D8E0100]        <1> 		mov	edi, device_name
  1531 00012B06 EB04                <1> 		jmp	short gdn_6
  1532                              <1> gdn_5:
  1533 00012B08 3C00                <1> 		cmp	al, 0
  1534 00012B0A 7419                <1> 		je	short gdn_7
  1535                              <1> gdn_6:
  1536 00012B0C E8B9000000          <1> 		call lodsb_capitalize
  1537 00012B11 81FF[558E0100]      <1> 		cmp	edi, device_name + 8
  1538 00012B17 72E4                <1> 		jb	short gdn_3
  1539 00012B19 3C00                <1> 		cmp	al, 0
  1540 00012B1B 75DC                <1> 		jne	short gdn_err
  1541 00012B1D 81FF[4E8E0100]      <1> 		cmp	edi, device_name + 1
  1542 00012B23 76D4                <1> 		jna	short gdn_err ; null name after '/'
  1543                              <1> gdn_7:
  1544 00012B25 AA                  <1> 		stosb
  1545                              <1> 		; zero padding ("NAME",0,0,0,0)
  1546 00012B26 81FF[558E0100]      <1> 		cmp	edi, device_name + 8
  1547 00012B2C 72F7                <1> 		jb	short gdn_7
  1548                              <1> gdn_8:
  1549                              <1> 		; search for kernel device names
  1550 00012B2E BE[4D8E0100]        <1> 		mov	esi, device_name 
  1551 00012B33 BF[3E3F0100]        <1> 		mov	edi, KDEV_NAME
  1552 00012B38 31C0                <1> 		xor	eax, eax
  1553                              <1> gdn_9:
  1554 00012B3A A7                  <1> 		cmpsd	
  1555 00012B3B 7505                <1> 		jne	short gdn_10
  1556 00012B3D A7                  <1> 		cmpsd
  1557 00012B3E 7503                <1> 		jne	short gdn_11
  1558 00012B40 EB2B                <1> 		jmp	short gdn_17 ; match
  1559                              <1> gdn_10:
  1560 00012B42 A7                  <1> 		cmpsd  ; add esi, 4 & add edi, 4
  1561                              <1> gdn_11:
  1562 00012B43 BE[4D8E0100]        <1> 		mov	esi, device_name
  1563 00012B48 FEC0                <1> 		inc	al
  1564 00012B4A 3C16                <1> 		cmp	al, NumOfKernelDevNames
  1565 00012B4C 72EC                <1> 		jb	short gdn_9
  1566                              <1> gdn_12:
  1567                              <1> 		; search for installable device names
  1568                              <1> 		; esi = offset device_name 
  1569 00012B4E BF[788E0100]        <1> 		mov	edi, IDEV_NAME
  1570 00012B53 28C0                <1> 		sub	al, al ; 0
  1571                              <1> gdn_13:
  1572 00012B55 A7                  <1> 		cmpsd	
  1573 00012B56 7505                <1> 		jne	short gdn_14
  1574 00012B58 A7                  <1> 		cmpsd
  1575 00012B59 7503                <1> 		jne	short gdn_15
  1576 00012B5B EB3F                <1> 		jmp	short gdn_19 ; match
  1577                              <1> gdn_14:
  1578 00012B5D A7                  <1> 		cmpsd  ; add esi, 4 & add edi, 4
  1579                              <1> gdn_15:
  1580 00012B5E BE[4D8E0100]        <1> 		mov	esi, device_name
  1581 00012B63 FEC0                <1> 		inc	al
  1582 00012B65 3C08                <1> 		cmp	al, NumOfInstallableDevices
  1583 00012B67 72EC                <1> 		jb	short gdn_13
  1584                              <1> 
  1585                              <1> gdn_16: 	; error: invalid device name (not found) !
  1586 00012B69 30C0                <1> 		xor	al, al
  1587 00012B6B F9                  <1> 		stc
  1588 00012B6C C3                  <1> 		retn
  1589                              <1> 
  1590                              <1> gdn_17:		; name match (with one of kernel device names)
  1591                              <1> 		;
  1592                              <1> 		; convert KDEV_NAME index to 
  1593                              <1> 		; KDEV_NUMBER index
  1594                              <1> 		; (different names are used for same devices)
  1595                              <1> 		; (example: "COM1" & "TTY8" = device number 18) 
  1596 00012B6D 89C3                <1> 		mov	ebx, eax ; < 256
  1597 00012B6F 8A83[EE3F0100]      <1> 		mov	al, [KDEV_NUMBER+ebx]
  1598                              <1> 
  1599                              <1> 		; check if empty dev entry in the list
  1600 00012B75 80B8[FC8F0100]00    <1> 		cmp	byte [DEV_OPENMODE+eax], 0
  1601 00012B7C 771B                <1> 		ja	short gdn_18 ; it must be already set
  1602                              <1> 
  1603                              <1> 		; (re)set device name and access flags
  1604                              <1> 		; (remain open work will be easy after that)
  1605                              <1> 		; (NOTE: here, data will be copied to bss section)
  1606 00012B7E 88C3                <1> 		mov	bl, al
  1607 00012B80 83EF08              <1> 		sub	edi, 8 ; kernel device name address (data)
  1608 00012B83 66C1E302            <1> 		shl	bx, 2 
  1609 00012B87 89BB[1A900100]      <1> 		mov	[DEV_NAME_PTR+ebx], edi ; (all) device names
  1610 00012B8D 8A98[44410100]      <1> 		mov	bl, [KDEV_ACCESS+eax] ; kernel dev list (data)
  1611 00012B93 8898[488F0100]      <1> 		mov	[DEV_ACCESS+eax], bl ; (all) device list (bss)
  1612                              <1> gdn_18:
  1613 00012B99 FEC0                <1> 		inc	al ; 1 to NumOfKernelDevNames (<=7Fh)
  1614                              <1> 		; eax = device index/entry number
  1615 00012B9B C3                  <1> 		retn		
  1616                              <1> 
  1617                              <1> gdn_19:		; name match (with one of installable device names)
  1618                              <1> 		;
  1619                              <1> 		; al = 0 to NumOfInstallableDevices - 1 (<=7Fh)
  1620                              <1> 
  1621 00012B9C 89C3                <1> 		mov	ebx, eax
  1622 00012B9E 80C316              <1> 		add	bl, NumOfKernelDevices 	; < NUMOFDEVICES	
  1623                              <1> 
  1624                              <1> 		; check if empty dev entry in the list
  1625 00012BA1 80BB[FC8F0100]00    <1> 		cmp	byte [DEV_OPENMODE+ebx], 0
  1626 00012BA8 771D                <1> 		ja	short gdn_20 ; it must be already set
  1627                              <1> 
  1628                              <1> 		; (re)set device name and access flags
  1629                              <1> 		; (remain open work will be easy after that)
  1630 00012BAA 83EF08              <1> 		sub	edi, 8 ; installable device name address
  1631 00012BAD 66C1E302            <1> 		shl	bx, 2 ;*4
  1632 00012BB1 89BB[1A900100]      <1> 		mov	[DEV_NAME_PTR+ebx], edi ; (all) device names
  1633 00012BB7 66C1EB02            <1> 		shr	bx, 2
  1634 00012BBB 8A80[C08E0100]      <1> 		mov	al, [IDEV_FLAGS+eax] ; installable dev list
  1635 00012BC1 8883[488F0100]      <1> 		mov	[DEV_ACCESS+ebx], al ; (all) device list
  1636                              <1> gdn_20:	
  1637 00012BC7 88D8                <1> 		mov	al, bl
  1638                              <1> 		; eax = device index/entry number ; < NUMOFDEVICES  
  1639 00012BC9 C3                  <1> 		retn
  1640                              <1> 
  1641                              <1> lodsb_capitalize:
  1642                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1643                              <1> 	; INPUT -> [esi] = character
  1644                              <1> 	;          edi = destination
  1645                              <1> 	; OUTPUT -> AL contains capitalized character
  1646                              <1> 	;	   esi = esi+1
  1647                              <1> 	;	   edi = edi+1	
  1648                              <1> 	; 
  1649 00012BCA AC                  <1> 	lodsb	
  1650 00012BCB 3C61                <1> 	cmp al, 61h
  1651 00012BCD 7206                <1>      	jb  short lodsb_cap_retn
  1652 00012BCF 3C7A                <1>      	cmp al, 7Ah
  1653 00012BD1 7702                <1>      	ja  short lodsb_cap_retn
  1654 00012BD3 24DF                <1>      	and al, 0DFh
  1655                              <1> lodsb_cap_retn:
  1656 00012BD5 AA                  <1> 	stosb
  1657 00012BD6 C3                  <1> 	retn
  1658                              <1> 
  1659                              <1> device_open:
  1660                              <1> 	; 08/10/2016 - TRDOS 386 (TRDOS v2.0)
  1661                              <1> 	; Complete device opening work for sysopen (device)
  1662                              <1> 	;
  1663                              <1> 	; INPUT -> 
  1664                              <1> 	;	EAX = Device Number (AL)
  1665                              <1> 	;        CL = Open mode (1 = read, 2 = write)
  1666                              <1> 	;	 CH = Device access byte (bit 0 = 0)		
  1667                              <1> 	; OUTPUT ->
  1668                              <1> 	;	EAX = Device Number	
  1669                              <1> 	;	CF = 0 -> device has been opened
  1670                              <1> 	;	CF = 1 -> device could not be opened
  1671                              <1> 	;
  1672                              <1> 	;  Modified registers: ebx, (edx, ecx, esi, edi, ebp)
  1673                              <1> 	;
  1674                              <1> 
  1675 00012BD7 89C3                <1> 	mov	ebx, eax
  1676 00012BD9 66C1E302            <1> 	shl	bx, 2 ; *4
  1677                              <1> 
  1678 00012BDD F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  1679 00012BE0 7406                <1> 	jz	short d_open_2 ; Kernel device
  1680                              <1> 	; installable device
  1681                              <1> d_open_1:
  1682 00012BE2 FFA3[C48E0100]      <1>         jmp	dword [ebx+IDEV_OADDR-4]
  1683                              <1> d_open_2:
  1684 00012BE8 FFA3[00400100]      <1> 	jmp	dword [ebx+KDEV_OADDR-4]
  1685                              <1> 
  1686                              <1> device_close:
  1687                              <1> 	; 08/10/2016 - TRDOS 386 (TRDOS v2.0)
  1688                              <1> 	; Complete device closing work for sysclose (device)
  1689                              <1> 	;
  1690                              <1> 	; INPUT -> 
  1691                              <1> 	;	EAX = Device Number (AL)
  1692                              <1> 	;        CL = Open mode (1 = read, 2 = write)
  1693                              <1> 	;	 CH = Device access byte (bit 0 = 0)		
  1694                              <1> 	; OUTPUT ->
  1695                              <1> 	;	EAX = Device Number	
  1696                              <1> 	;	CF = 0 -> device has been closed
  1697                              <1> 	;	CF = 1 -> device could not be closed
  1698                              <1> 	;
  1699                              <1> 	; Modified registers: ebx, (edx, ecx, esi, edi, ebp)
  1700                              <1> 	;
  1701                              <1> 
  1702 00012BEE 89C3                <1> 	mov	ebx, eax
  1703 00012BF0 66C1E302            <1> 	shl	bx, 2 ; *4
  1704                              <1> 
  1705 00012BF4 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  1706 00012BF7 7406                <1> 	jz	short d_close_2 ; Kernel device
  1707                              <1> 	; installable device
  1708                              <1> d_close_1:
  1709 00012BF9 FFA3[E48E0100]      <1>         jmp	dword [ebx+IDEV_CADDR-4]
  1710                              <1> d_close_2:
  1711 00012BFF FFA3[50400100]      <1> 	jmp	dword [ebx+KDEV_CADDR-4]	
  1712                              <1> 
  1713                              <1> rnull:
  1714                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1715                              <1> 	; read null (read from null device)
  1716 00012C05 C3                  <1> 	retn
  1717                              <1> 
  1718                              <1> wnull:
  1719                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1720                              <1> 	; write null (write to null device)
  1721 00012C06 C3                  <1> 	retn
  1722                              <1> 
  1723                              <1> dev_IRQ_service:
  1724                              <1> 	; 12/05/2017
  1725                              <1> 	; 13/04/2017
  1726                              <1> 	; 27/02/2017 - TRDOS 386 (TRDOS v2.0)
  1727                              <1> 	; INPUT ->
  1728                              <1> 	;	AL = IRQ Number (0 to 15)
  1729                              <1> 	;	
  1730 00012C07 53                  <1> 	push	ebx
  1731 00012C08 0FB6D8              <1> 	movzx	ebx, al
  1732 00012C0B C0E302              <1> 	shl	bl, 2 ; * 4	
  1733 00012C0E 8B9B[82930100]      <1> 	mov	ebx, [ebx+DEV_INT_HNDLR]
  1734 00012C14 21DB                <1> 	and 	ebx, ebx
  1735 00012C16 7404                <1>         jz	short dIRQ_s_retn
  1736 00012C18 50                  <1> 	push	eax
  1737                              <1> 
  1738 00012C19 FFD3                <1> 	call	ebx
  1739                              <1> 
  1740 00012C1B 58                  <1> 	pop	eax
  1741                              <1> dIRQ_s_retn:
  1742 00012C1C 5B                  <1> 	pop	ebx
  1743 00012C1D C3                  <1> 	retn		
  1744                              <1> 
  1745                              <1> 
  1746                              <1> set_dev_IRQ_service:
  1747                              <1> 	; 13/04/2017 - TRDOS 386 (TRDOS v2.0)
  1748                              <1> 	;
  1749                              <1> 	; Set Device Interrupt Service
  1750                              <1> 	;
  1751                              <1> 	; INPUT ->
  1752                              <1> 	;	AL = IRQ Number
  1753                              <1> 	;	EBX = Hardware Interrupt Service Address
  1754                              <1> 	;
  1755                              <1> 	; Note: There is not a validation check here
  1756                              <1> 	;	because this procedure is called by
  1757                              <1> 	;	TRDOS 386 kernel !
  1758                              <1> 	;       (Even if a device driver does not exist
  1759                              <1> 	;	this setting may be used by sysaudio
  1760                              <1> 	;	and other system calls for hardware
  1761                              <1> 	;	components which use IRQ method for I/O.)
  1762                              <1> 	;
  1763                              <1> 	;push	esi
  1764 00012C1E 0FB6F0              <1> 	movzx	esi, al
  1765 00012C21 66C1E602            <1> 	shl	si, 2 ; * 4	
  1766 00012C25 899E[82930100]      <1> 	mov	[esi+DEV_INT_HNDLR], ebx
  1767                              <1> 	;pop	esi
  1768 00012C2B C3                  <1> 	retn		
  1769                              <1> 	
  1770                              <1> 
  1771                              <1> sysaudio: ; AUDIO FUNCTIONS
  1772                              <1> 	; 28/07/2020
  1773                              <1> 	; 27/07/2020
  1774                              <1> 	; 10/10/2017
  1775                              <1> 	; 22/06/2017
  1776                              <1> 	; 28/05/2017, 04/06/2017, 05/06/2017, 10/06/2017
  1777                              <1> 	; 01/05/2017, 12/05/2017, 15/05/2017, 20/05/2017
  1778                              <1> 	; 21/04/2017, 22/04/2017, 23/04/2017, 24/04/2017
  1779                              <1> 	; 10/04/2017, 13/04/2017, 14/04/2017, 16/04/2017
  1780                              <1> 	; 03/04/2017 (VIA VT8237R)
  1781                              <1> 	; 01/04/2016 (trdosk6.s -> tdosk8.s)
  1782                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  1783                              <1> 	;
  1784                              <1> 	; Inputs:
  1785                              <1> 	;
  1786                              <1> 	;	BH = 0 -> Beep (PC Speaker)
  1787                              <1> 	;	     BL = Duration Counter (1 for 1/64 second)
  1788                              <1> 	;	     CX = Frequency Divisor (1193180/Frequency)
  1789                              <1> 	;		 (1331 for 886 Hz)
  1790                              <1> 	;
  1791                              <1> 	;	01/04/2017	
  1792                              <1> 	;
  1793                              <1> 	; 	BH = 1 -> DETECT (& ENABLE) AUDIO DEVICE
  1794                              <1> 	;	     BL = 0 : PC SPEAKER
  1795                              <1> 	;		  1 : SOUND BLASTER 16
  1796                              <1> 	;		  2 : INTEL AC'97
  1797                              <1> 	;		  3 : VIA VT8237R (VT8233)			 				
  1798                              <1> 	;		  4 : INTEL HDA
  1799                              <1> 	;	      5-FEh : unknown/invalid
  1800                              <1> 	;	        ; 04/06/2017
  1801                              <1> 	;		FFh : Get current audio device id
  1802                              <1> 	;
  1803                              <1> 	; 	BH = 2 -> ALLOCATE AUDIO BUFFER (for user)
  1804                              <1> 	;		ECX = Audio Buffer Size (must be equal to
  1805                              <1> 	;		      the half of DMA buffer size) 
  1806                              <1> 	;		EDX = Virtual Address of the buffer
  1807                              <1> 	;		      (This is not DMA buffer!)
  1808                              <1> 	;
  1809                              <1> 	;	BH = 3 -> INITIALIZE AUDIO DEVICE
  1810                              <1> 	;	     BL = 0,2 -> for Signal Response Byte	 	
  1811                              <1> 	;	     	CL = Signal Response Byte Value (fixed)
  1812                              <1> 	;				if BL = 0
  1813                              <1> 	;	             auto increment of S.R.B. value
  1814                              <1> 	;			 	if BL = 2
  1815                              <1> 	;	        EDX = Signal Response (Return) Byte Address
  1816                              <1> 	;	     	   			
  1817                              <1> 	;	     BL = 1 for CallBack Method	 	
  1818                              <1> 	;	    	EDX = CallBack Service Address (Virtual)
  1819                              <1> 	;
  1820                              <1> 	;	     BL > 2 -> invalid function	
  1821                              <1> 	;
  1822                              <1> 	;	    (Audio buffer must be allocated before
  1823                              <1> 	;	     initialization.) 		
  1824                              <1> 	;
  1825                              <1> 	;	BH = 4 -> START TO PLAY
  1826                              <1> 	;	     BL = Mode
  1827                              <1> 	;		  Bit 0 = mono/stereo (1 = stereo)		
  1828                              <1> 	;		  Bit 1 = 8 bit / 16 bit (1 = 16 bit)
  1829                              <1> 	;	     CX = Sampling Rate (Hz)
  1830                              <1> 	;
  1831                              <1> 	;	BH = 5 -> PAUSE
  1832                              <1> 	;	     BL = Any
  1833                              <1> 	;
  1834                              <1> 	;	BH = 6 -> CONTINUE TO PLAY
  1835                              <1> 	;	     BL = Any
  1836                              <1> 	;
  1837                              <1> 	;	BH = 7 -> STOP
  1838                              <1> 	;	     BL = Any
  1839                              <1> 	;
  1840                              <1> 	;	BH = 8 -> RESET 
  1841                              <1> 	;	     BL = Any
  1842                              <1> 	;
  1843                              <1> 	;	BH = 9 -> CANCEL (CALLBACK or S.R.B. SERVICE)
  1844                              <1> 	;	     BL = Any	
  1845                              <1> 	;	
  1846                              <1> 	;	BH = 10 -> DEALLOCATE AUDIO BUFFER (for user)
  1847                              <1> 	;	     BL = Any
  1848                              <1> 	;
  1849                              <1> 	;	BH = 11 -> SET VOLUME LEVEL
  1850                              <1> 	;	     BL: (Bit 0 to 6)
  1851                              <1> 	;		  0 = Master (Playback, Lineout) volume
  1852                              <1> 	;	     CL = Left Channel Volume
  1853                              <1> 	;	     CH = Right Channel Volume
  1854                              <1> 	;	
  1855                              <1> 	;	     Note: If BL >= 80h (Bit 7 of BL is set),
  1856                              <1> 	;	     volume level will be set for next playing
  1857                              <1> 	;	     (actual volume level will not be changed
  1858                              <1> 	;	     immediately)	
  1859                              <1> 	;
  1860                              <1> 	;	BH = 12 -> DISABLE AUDIO DEVICE
  1861                              <1> 	;	     (reset audio device and unlink dma buffer)	
  1862                              <1> 	;	     BL = Any	  		  	  	
  1863                              <1> 	;
  1864                              <1> 	;    	12/05/2017
  1865                              <1> 	;	BH = 13 -> MAP DMA BUFFER TO USER
  1866                              <1> 	;	    (for direct access to system's dma buffer)
  1867                              <1> 	;
  1868                              <1> 	;	     ECX = map size in bytes 
  1869                              <1> 	;		  (will be rounded up to page borders)
  1870                              <1> 	;	     EDX = Virtual Address of the buffer
  1871                              <1> 	;		  (Will be rounded up to page borders)
  1872                              <1> 	;
  1873                              <1> 	;	05/06/2017	
  1874                              <1> 	;    	04/06/2017
  1875                              <1> 	;	BH = 14 -> GET AUDIO DEVICE INFO
  1876                              <1> 	;	     BL: 0 = Audio Controller Info
  1877                              <1> 	;	       > 0 = Invalid for now! 
  1878                              <1> 	;
  1879                              <1> 	;	22/06/2017	
  1880                              <1> 	;	BH = 15 -> GET CURRENT SOUND DATA (for graphics)
  1881                              <1> 	;	     BL: 0 -> PCM OUT data
  1882                              <1> 	;	       > 0 -> Invalid for now! 
  1883                              <1> 	;	     ECX = 0 -> Get DMA Buffer Pointer
  1884                              <1> 	;		 EDX = Not Used
  1885                              <1> 	;	     ECX > 0 -> Byte count for buffer (EDX)	 	
  1886                              <1> 	;	         EDX = Buffer Address (Virtual)	
  1887                              <1> 	;
  1888                              <1> 	;	10/10/2017	
  1889                              <1> 	;	BH = 16 -> UPDATE DMA BUFFER DATA
  1890                              <1> 	;		   (by using the Audio Buffer content)
  1891                              <1> 	;	     BL = 0 : Update dma half buffer in sequence
  1892                              <1> 	;		      (automatic destination)	
  1893                              <1> 	;		  1 : Update 1st half of the dma buffer
  1894                              <1> 	;		  2 : Update 2nd half of the dma buffer
  1895                              <1> 	;		  3-FEh: Invalid!
  1896                              <1> 	;		  FFh = Get current flag value
  1897                              <1> 	;			(Half buffer number -1)
  1898                              <1> 	;
  1899                              <1> 	;
  1900                              <1> 	; Outputs:
  1901                              <1> 	;
  1902                              <1> 	;	For BH = 0 -> Beep
  1903                              <1> 	;	    None
  1904                              <1> 	;
  1905                              <1> 	;	01/04/2017
  1906                              <1> 	;
  1907                              <1> 	; 	For BH = 1 -> DETECT (& ENABLE) AUDIO DEVICE
  1908                              <1> 	;	    AH = 0 : PC SPEAKER
  1909                              <1> 	;		 1 : SOUND BLASTER 16
  1910                              <1> 	;		 2 : INTEL AC'97
  1911                              <1> 	;		 3 : VIA VT8237R (VT8233)			 				
  1912                              <1> 	;		 4 : INTEL HDA
  1913                              <1> 	;	      5-FFh : unknown/invalid
  1914                              <1> 	;	    AL = mode status
  1915                              <1> 	;		 bit 0 = mono /stereo (1 = stereo)
  1916                              <1> 	;		 bit 1 = 8 bit / 16 bit ( 1 = 16 bit)
  1917                              <1> 	;	    04/06/2017
  1918                              <1> 	;	    EBX = PCI DEVICE/VENDOR ID (if >0)
  1919                              <1> 	;		 (BX = VENDOR ID) 
  1920                              <1> 	;	    (if CF = 1 -> Error code in EAX)
  1921                              <1> 	;
  1922                              <1> 	; 	For BH = 2 -> ALLOCATE AUDIO BUFFER (for user)
  1923                              <1> 	;	    EAX = Physical Address of the buffer
  1924                              <1> 	;	    (if CF = 1 -> Error code in EAX)
  1925                              <1> 	;
  1926                              <1> 	;	For BH = 3 -> INITIALIZE AUDIO DEVICE
  1927                              <1> 	;	    (if CF = 1 -> Error code in EAX)
  1928                              <1> 	;
  1929                              <1> 	;	For BH = 4 -> START TO PLAY
  1930                              <1> 	;	    none (if CF = 1 -> Error code in EAX)	
  1931                              <1> 	;
  1932                              <1> 	;	For BH = 5 -> PAUSE
  1933                              <1> 	;	    none (if CF = 1 -> Error code in EAX)	
  1934                              <1> 	;
  1935                              <1> 	;	For BH = 6 -> CONTINUE TO PLAY
  1936                              <1> 	;	    none (if CF = 1 -> Error code in EAX)	
  1937                              <1> 	;
  1938                              <1> 	;	For BH = 7 -> STOP
  1939                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1940                              <1> 	;
  1941                              <1> 	;	For BH = 8 -> RESET 
  1942                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1943                              <1> 	;
  1944                              <1> 	;	For BH = 9 -> CANCEL (CALLBACK or S.R.B. SERVICE)
  1945                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1946                              <1> 	;	
  1947                              <1> 	;	For BH = 10 -> DEALLOCATE AUDIO BUFFER (for user)
  1948                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1949                              <1> 	;
  1950                              <1> 	;	For BH = 11 -> SET VOLUME LEVEL
  1951                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1952                              <1> 	;
  1953                              <1> 	;	For BH = 12 -> DISABLE AUDIO DEVICE
  1954                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1955                              <1> 	; 
  1956                              <1> 	;    	12/05/2017
  1957                              <1> 	;	For BH = 13 -> MAP DMA BUFFER TO USER
  1958                              <1> 	;	    EAX = Physical Address of the buffer
  1959                              <1> 	;	    (if CF = 1 -> Error code in EAX)	
  1960                              <1> 	;
  1961                              <1> 	;    	04/06/2017
  1962                              <1> 	;	For BH = 14 -> GET AUDIO DEVICE INFO
  1963                              <1> 	;	(for BL = 0) ; 05/06/2017	
  1964                              <1> 	;	    EAX = IRQ Number in AL
  1965                              <1> 	;		  Audio Device Number in AH 
  1966                              <1> 	;	    EBX = DEV/VENDOR ID
  1967                              <1> 	;		 (DDDDDDDDDDDDDDDDVVVVVVVVVVVVVVVV)
  1968                              <1> 	;	    ECX = BUS/DEV/FN 
  1969                              <1> 	;		 (00000000BBBBBBBBDDDDDFFF00000000)
  1970                              <1> 	;	    EDX = NABMBAR/NAMBAR (for AC97)
  1971                              <1> 	;		  (Low word, DX = NAMBAR address)
  1972                              <1> 	;	    EDX = Base IO Addr (DX) for SB16 & VT8233	  			  		
  1973                              <1> 	;	    (if CF = 1 -> Error code in EAX)	
  1974                              <1> 	;	                 (ERR_DEV_NOT_RDY = 15)  
  1975                              <1> 	;
  1976                              <1> 	;	22/06/2017	
  1977                              <1> 	;	For BH = 15 -> GET CURRENT SOUND DATA
  1978                              <1> 	;			 (for graphics)
  1979                              <1> 	;	(for BL = 0)
  1980                              <1> 	;	 If ECX input is 0 
  1981                              <1> 	;	    EAX = DMA Buffer Current Position (Offset)
  1982                              <1> 	;	 If ECX input >  0
  1983                              <1> 	;	    EAX = Actual transfer count 		 	
  1984                              <1> 	;	    (Sound samples will be copied from 
  1985                              <1> 	;	     Current DMA Buffer Position to EDX
  1986                              <1> 	;	     virtual address as EAX bytes.)
  1987                              <1> 	;	 ((If CF = 1 ->  Error code in EAX))
  1988                              <1> 	;
  1989                              <1> 	;
  1990                              <1> 	;	10/10/2017	
  1991                              <1> 	;	For BH = 16 -> UPDATE DMA BUFFER DATA
  1992                              <1> 	;	    EAX = 0, if the updated (or current)
  1993                              <1> 	;		     half buffer is DMA half buffer 1
  1994                              <1> 	;	    EAX = 1, if the updated (or current)
  1995                              <1> 	; 		     half buffer is DMA half buffer 2 	  	
  1996                              <1> 	;	    (If CF = 1 -> Error code in EAX)	
  1997                              <1> 	;	
  1998                              <1> 
  1999 00012C2C 80FF11              <1> 	cmp	bh, AUDIO1L/4
  2000 00012C2F 0F83B7ACFFFF        <1> 	jnb	sysret
  2001                              <1> 
  2002 00012C35 C0E702              <1> 	shl	bh, 2 ; *4	
  2003 00012C38 0FB6F7              <1> 	movzx	esi, bh
  2004                              <1> 
  2005                              <1> 	; 22/04/2017
  2006 00012C3B 31C0                <1> 	xor	eax, eax
  2007 00012C3D A3[64030300]        <1> 	mov	[u.r0], eax  ; 0
  2008                              <1> 		
  2009 00012C42 FF96[4D2C0100]      <1> 	call	dword [esi+AUDIO1]
  2010                              <1> 	;jc	error
  2011 00012C48 E99FACFFFF          <1> 	jmp	sysret	
  2012                              <1> 
  2013 00012C4D [F0230000]          <1> AUDIO1:	dd	beep ; FUNCTION = 0 (bl = Duration Counter
  2014                              <1> 		     ; 		     cx = Frequency Divisor
  2015 00012C51 [912C0100]          <1> 	dd	soundc_detect
  2016 00012C55 [2D2D0100]          <1> 	dd	sound_alloc
  2017 00012C59 [EB2D0100]          <1> 	dd	soundc_init
  2018 00012C5D [A32F0100]          <1> 	dd	sound_play
  2019 00012C61 [3F300100]          <1> 	dd	sound_pause
  2020 00012C65 [69300100]          <1> 	dd	sound_continue
  2021 00012C69 [93300100]          <1> 	dd	sound_stop
  2022 00012C6D [BC300100]          <1> 	dd	soundc_reset
  2023 00012C71 [ED300100]          <1> 	dd	soundc_cancel
  2024 00012C75 [13310100]          <1> 	dd	sound_dalloc
  2025 00012C79 [3E310100]          <1> 	dd	sound_volume
  2026 00012C7D [90310100]          <1> 	dd	soundc_disable
  2027 00012C81 [02320100]          <1> 	dd	sound_dma_map
  2028 00012C85 [71320100]          <1> 	dd	soundc_info
  2029 00012C89 [D0320100]          <1> 	dd	sound_data
  2030 00012C8D [7D330100]          <1> 	dd	sound_update
  2031                              <1> 	
  2032                              <1> AUDIO1L	EQU	$ - AUDIO1
  2033                              <1> 
  2034                              <1> soundc_detect:
  2035                              <1> 	; FUNCTION = 1
  2036                              <1> 	; bl = Audio device type number 
  2037                              <1> 	; (0= pc speaker, 1 = sound blaster 16, 2 = intel ac97
  2038                              <1> 	;  3= via vt823x, 4 = intel HDA, 0FFh= any)
  2039                              <1> 	
  2040                              <1> 	; 04/06/2017
  2041 00012C91 8A25[11940100]      <1> 	mov	ah, [audio_device]
  2042 00012C97 80FBFF              <1> 	cmp	bl, 0FFh ; get current audio device id
  2043 00012C9A 7408                <1> 	je	short sysaudio0
  2044                              <1> 
  2045 00012C9C 20E4                <1> 	and	ah, ah
  2046 00012C9E 741E                <1> 	jz	short soundc_get_dev
  2047                              <1> 
  2048 00012CA0 38DC                <1> 	cmp	ah, bl
  2049 00012CA2 7567                <1> 	jne	short soundc_dev_err
  2050                              <1> 
  2051                              <1> sysaudio0:	
  2052 00012CA4 A0[12940100]        <1> 	mov	al, [audio_mode]
  2053                              <1> sysaudio1:
  2054 00012CA9 A3[64030300]        <1> 	mov	[u.r0], eax
  2055 00012CAE 8B1D[1C940100]      <1> 	mov	ebx, [audio_vendor] ; (DEVICE/VENDOR ID)
  2056 00012CB4 8B2D[60030300]      <1> 	mov	ebp, [u.usp]
  2057 00012CBA 895D10              <1> 	mov	[ebp+16], ebx  ; ebx
  2058 00012CBD C3                  <1> 	retn
  2059                              <1> 
  2060                              <1> soundc_get_dev:
  2061                              <1> 	; 28/05/2017
  2062                              <1> 	; 03/04/2017, 24/04/2017
  2063 00012CBE C605[10940100]00    <1> 	mov	byte [audio_pci], 0
  2064 00012CC5 80FB03              <1> 	cmp	bl, 3 ; VIA VT8233 (VT8237R) Audio Controller & AC97 Codec
  2065                              <1> 	;jne	short soundc_get_dev_sb
  2066                              <1> 	; 28/05/2017
  2067 00012CC8 7220                <1> 	jb	short soundc_get_dev_sb
  2068 00012CCA 773F                <1> 	ja	short soundc_dev_err  ; temporary (28/05/2017)
  2069                              <1> 	;  		
  2070 00012CCC E86C180000          <1> 	call	DetectVT8233
  2071 00012CD1 7238                <1> 	jc	short soundc_dev_err
  2072                              <1> 	; eax = 0
  2073                              <1> 
  2074                              <1> 	;mov	ebx, [audio_vendor]
  2075                              <1> 	; ebx = DEVICE/VENDOR ID
  2076                              <1> 	;	DDDDDDDDDDDDDDDDVVVVVVVVVVVVVVVV
  2077                              <1> 
  2078 00012CD3 B003                <1> 	mov	al, 3  ; VIA VT8237R (VT3233) Audio Controller
  2079 00012CD5 88C4                <1> 	mov	ah, al
  2080                              <1> 
  2081                              <1> soundc_get_pci_dev_ok: ; 28/05/2017
  2082 00012CD7 FE05[10940100]      <1> 	inc	byte [audio_pci] ; = 1
  2083                              <1> soundc_get_dev_ok:
  2084                              <1> 	
  2085                              <1> soundc_get_dev_sb16_ok:
  2086 00012CDD A2[11940100]        <1> 	mov	[audio_device], al
  2087 00012CE2 8825[12940100]      <1> 	mov	[audio_mode], ah ; stereo (bit0), 16 bit (bit1) capability	
  2088 00012CE8 EBBF                <1> 	jmp	short sysaudio1
  2089                              <1> 
  2090                              <1> soundc_get_dev_sb:
  2091                              <1> 	; 24/04/2017
  2092 00012CEA 80FB01              <1> 	cmp	bl, 1 ; Sound Blaster 16
  2093 00012CED 750E                <1> 	jne	short soundc_get_dev_ich ; 28/05/2017
  2094                              <1> 	;
  2095 00012CEF E86D1D0000          <1> 	call	DetectSB
  2096 00012CF4 7215                <1> 	jc	short soundc_dev_err
  2097 00012CF6 B801030000          <1> 	mov	eax, 0301h ; Sound Blaster 16
  2098 00012CFB EBE0                <1> 	jmp	short soundc_get_dev_sb16_ok
  2099                              <1> 
  2100                              <1> soundc_get_dev_ich:
  2101                              <1> 	; 28/05/2017
  2102                              <1> 	;cmp	bl, 2 ; Intel AC'97 Audio Controller (ICH)
  2103                              <1> 	;jne	short soundc_dev_err ; Temporary  (28/05/2017)
  2104                              <1> 	;			     ; (Here will be modified just after
  2105                              <1> 	;			     ; new sound card code will be ready!)  	
  2106 00012CFD E82E180000          <1> 	call	DetectICH
  2107 00012D02 7207                <1> 	jc	short soundc_dev_err
  2108                              <1> 	;
  2109 00012D04 B802030000          <1> 	mov	eax, 0302h ; AC'97 (ICH)
  2110 00012D09 EBCC                <1> 	jmp	short soundc_get_pci_dev_ok
  2111                              <1> 
  2112                              <1> soundc_dev_err:
  2113 00012D0B B80F000000          <1> 	mov	eax, ERR_DEV_NOT_RDY ; Device not ready !
  2114 00012D10 EB0C                <1> 	jmp	short sysaudio_err
  2115                              <1> 
  2116                              <1> sound_buff_error:
  2117 00012D12 B82E000000          <1> 	mov	eax, ERR_BUFFER ; Buffer error !
  2118 00012D17 EB05                <1> 	jmp	short sysaudio_err
  2119                              <1> 
  2120                              <1> soundc_respond_err:
  2121                              <1> 	; ERR_TIME_OUT ; 'time out !' error	
  2122 00012D19 B819000000          <1> 	mov	eax, ERR_DEV_NOT_RESP ; 'device not responding !' error
  2123                              <1> sysaudio_err:
  2124 00012D1E A3[64030300]        <1> 	mov	[u.r0], eax
  2125 00012D23 A3[C8030300]        <1> 	mov	[u.error], eax
  2126 00012D28 E99FABFFFF          <1> 	jmp	error
  2127                              <1> 
  2128                              <1> sound_alloc:
  2129                              <1> 	; FUNCTION =  2
  2130                              <1> 	; ecx = audio buffer size (in bytes)
  2131                              <1> 	; edx = audio buffer address (virtual)
  2132                              <1> 	; 27/07/2020
  2133                              <1> 	; 28/05/2017
  2134                              <1> 	; 01/05/2017, 15/05/2017
  2135                              <1> 	; 21/04/2017, 24/04/2017
  2136 00012D2D 803D[10940100]00    <1> 	cmp	byte [audio_pci], 0
  2137 00012D34 7708                <1> 	ja	short snd_alloc_0
  2138                              <1> 	; Max. 64KB DMA buffer !!!
  2139 00012D36 81F900800000        <1> 	cmp	ecx, 32768
  2140 00012D3C 77D4                <1> 	ja	short sound_buff_error
  2141                              <1> snd_alloc_0:
  2142                              <1> 	; 15/05/2017
  2143 00012D3E 81F900100000        <1> 	cmp	ecx, 4096 ; PAGE_SIZE
  2144 00012D44 72CC                <1> 	jb	short sound_buff_error
  2145                              <1> 	;
  2146 00012D46 A1[24940100]        <1> 	mov	eax, [audio_buffer] ; audio buffer address (current)
  2147 00012D4B 09C0                <1> 	or	eax, eax
  2148 00012D4D 7445                <1> 	jz	short snd_alloc_2
  2149                              <1> 	; audio buffer exists !
  2150 00012D4F 8A1D[B3030300]      <1> 	mov	bl, [u.uno]
  2151 00012D55 3A1D[39940100]      <1> 	cmp	bl, [audio_user]
  2152 00012D5B 0F85FC000000        <1> 	jne	sndc_owner_error ; not owner !
  2153 00012D61 39D0                <1> 	cmp	eax, edx ; same virtual buffer address ?
  2154 00012D63 7508                <1> 	jne	short snd_alloc_1
  2155 00012D65 3B0D[2C940100]      <1> 	cmp	ecx, [audio_buff_size]
  2156 00012D6B 746C                <1> 	je	short snd_alloc_3 ; Nothing to do !
  2157                              <1> 				  ; Buffer has been set already!
  2158                              <1> snd_alloc_1:
  2159 00012D6D 51                  <1> 	push	ecx
  2160 00012D6E 52                  <1> 	push	edx
  2161 00012D6F 89C3                <1> 	mov	ebx, eax ; audio buffer address (current)
  2162 00012D71 8B0D[2C940100]      <1> 	mov	ecx, [audio_buff_size]
  2163 00012D77 E8523AFFFF          <1> 	call	deallocate_user_pages
  2164 00012D7C 5A                  <1> 	pop	edx
  2165 00012D7D 59                  <1> 	pop	ecx
  2166 00012D7E 31C0                <1> 	xor	eax, eax ; 0
  2167 00012D80 A3[24940100]        <1> 	mov	[audio_buffer], eax  ; 0
  2168 00012D85 A3[28940100]        <1>  	mov	[audio_p_buffer], eax  ; 0
  2169 00012D8A A3[2C940100]        <1>  	mov	[audio_buff_size], eax
  2170 00012D8F A2[39940100]        <1> 	mov	[audio_user], al ; 0
  2171                              <1> snd_alloc_2:
  2172 00012D94 89D3                <1> 	mov	ebx, edx
  2173                              <1> 	; 01/05/2017
  2174 00012D96 BA00F0FFFF          <1> 	mov	edx, ~PAGE_OFF ; truncating page offsets
  2175                              <1> 			       ; for aligning to page borders	
  2176                              <1> 	;and	eax, edx
  2177 00012D9B 21D3                <1> 	and	ebx, edx
  2178 00012D9D 21D1                <1> 	and	ecx, edx
  2179                              <1> 	; 15/05/2017
  2180                              <1> 	; EAX = Beginning address (physical)
  2181                              <1> 	; EAX = 0 -> Allocate mem block from the 1st proper aperture	
  2182                              <1> 	; ECX = Number of bytes to be allocated		
  2183 00012D9F E8CF36FFFF          <1> 	call	allocate_memory_block
  2184 00012DA4 0F8268FFFFFF        <1> 	jc	sound_buff_error
  2185                              <1> 	; EAX = Physical address of the allocated memory block
  2186                              <1> 	; ECX = Allocated bytes (as truncated to page border)
  2187                              <1> 	; EBX = Virtual address (as truncated to page border)
  2188 00012DAA 50                  <1> 	push	eax
  2189 00012DAB 53                  <1> 	push	ebx
  2190 00012DAC 51                  <1> 	push	ecx
  2191 00012DAD E8113BFFFF          <1> 	call	allocate_user_pages
  2192 00012DB2 59                  <1> 	pop	ecx
  2193 00012DB3 5B                  <1> 	pop	ebx
  2194 00012DB4 58                  <1> 	pop	eax
  2195 00012DB5 722A                <1> 	jc	short snd_alloc_4  ; insufficient memory, buff error
  2196                              <1> 	; eax = physical address of the user's audio buffer
  2197                              <1> 	; ebx = virtual address of the user's audio buffer
  2198                              <1> 	; ecx = buffer size (in bytes)
  2199 00012DB7 A3[28940100]        <1> 	mov	[audio_p_buffer], eax
  2200 00012DBC 891D[24940100]      <1> 	mov	[audio_buffer], ebx
  2201 00012DC2 890D[2C940100]      <1>  	mov	[audio_buff_size], ecx
  2202 00012DC8 8A15[B3030300]      <1> 	mov	dl, [u.uno]
  2203 00012DCE 8815[39940100]      <1> 	mov	[audio_user], dl
  2204 00012DD4 A3[64030300]        <1> 	mov	[u.r0], eax
  2205                              <1> snd_alloc_3:
  2206                              <1> 	; 27/07/2020
  2207 00012DD9 C605[38940100]00    <1> 	mov	byte [audio_flag], 0 ; clear dma half buffer flag
  2208                              <1> 	;	
  2209 00012DE0 C3                  <1> 	retn
  2210                              <1> snd_alloc_4:
  2211                              <1> 	; 15/05/2017
  2212                              <1> 	; EAX = Beginning address (physical)
  2213                              <1> 	; ECX = Number of bytes to be deallocated
  2214 00012DE1 E89A38FFFF          <1> 	call	deallocate_memory_block
  2215 00012DE6 E927FFFFFF          <1> 	jmp	sound_buff_error  ; insufficient memory, buff error
  2216                              <1> 
  2217                              <1> soundc_init:
  2218                              <1> 	; FUNCTION = 3 
  2219                              <1> 	; bl = method (0= s.r.b., 1= callback, 2= auto incr s.r.b.)
  2220                              <1> 	; cl = signal response byte (initial or fixed) value
  2221                              <1> 	; edx = signal response byte or callback address
  2222                              <1> 	; 27/07/2020
  2223                              <1> 	; 28/05/2017
  2224                              <1> 	; 12/05/2017, 20/05/2017
  2225                              <1> 	; 22/04/2017, 23/04/2017, 24/04/2017
  2226                              <1> 	; 13/04/2017, 14/04/2017, 16/04/2017, 21/04/2017
  2227                              <1> 	; 03/04/2017, 10/04/2017
  2228                              <1> 
  2229 00012DEB A0[11940100]        <1> 	mov	al, [audio_device]
  2230 00012DF0 20C0                <1> 	and	al, al
  2231 00012DF2 7549                <1> 	jnz	short sndc_init_6
  2232                              <1> 	;
  2233 00012DF4 C605[10940100]00    <1> 	mov	byte [audio_pci], 0
  2234 00012DFB 52                  <1> 	push	edx
  2235 00012DFC 53                  <1> 	push	ebx
  2236 00012DFD 51                  <1> 	push	ecx
  2237 00012DFE E85E1C0000          <1> 	call	DetectSB
  2238 00012E03 7213                <1> 	jc	short sndc_init_8
  2239 00012E05 66B80103            <1> 	mov	ax, 0301h ; Sound Blaster 16
  2240 00012E09 EB1E                <1> 	jmp	short sndc_init_7
  2241                              <1> 
  2242                              <1> sndc_init_11:
  2243                              <1> 	; 28/05/2017
  2244 00012E0B E820170000          <1> 	call	DetectICH ; Detect AC'97 (ICH) Audio Controller
  2245 00012E10 7217                <1> 	jc	short sndc_init_7
  2246 00012E12 66B80203            <1> 	mov	ax, 0302h ; Intel AC'97 Audio Device
  2247 00012E16 EB0B                <1> 	jmp	short sndc_init_12 ; (PCI device)
  2248                              <1> 
  2249                              <1> sndc_init_8:
  2250 00012E18 E820170000          <1> 	call	DetectVT8233
  2251                              <1> 	;jc	short sndc_init_7
  2252 00012E1D 72EC                <1> 	jc	sndc_init_11 ; 28/05/2017
  2253                              <1> 	; eax = 0
  2254 00012E1F B003                <1> 	mov	al, 3	; VIA VT8237R (VT3233) Audio Controller
  2255 00012E21 88C4                <1> 	mov	ah, al
  2256                              <1> 
  2257                              <1> sndc_init_12:
  2258 00012E23 FE05[10940100]      <1> 	inc	byte [audio_pci] ; = 1
  2259                              <1> sndc_init_7:
  2260 00012E29 59                  <1> 	pop	ecx
  2261 00012E2A 5B                  <1> 	pop	ebx
  2262 00012E2B 5A                  <1> 	pop	edx
  2263 00012E2C 0F82D9FEFFFF        <1> 	jc	soundc_dev_err
  2264                              <1> 	;
  2265 00012E32 A2[11940100]        <1> 	mov	[audio_device], al
  2266 00012E37 8825[12940100]      <1> 	mov	[audio_mode], ah ; stereo (bit0), 16 bit (bit1) capability
  2267                              <1> 
  2268                              <1> sndc_init_6:
  2269 00012E3D 833D[24940100]00    <1> 	cmp	dword [audio_buffer], 0
  2270 00012E44 0F86C8FEFFFF        <1> 	jna	sound_buff_error
  2271                              <1> 
  2272 00012E4A A0[B3030300]        <1> 	mov	al, [u.uno]
  2273 00012E4F 8A25[39940100]      <1> 	mov	ah, [audio_user]
  2274 00012E55 08E4                <1> 	or	ah, ah
  2275 00012E57 7418                <1> 	jz	short sndc_init0
  2276 00012E59 38E0                <1> 	cmp	al, ah
  2277 00012E5B 7419                <1> 	je	short sndc_init1
  2278                              <1> 
  2279                              <1> sndc_owner_error:
  2280 00012E5D B80B000000          <1> 	mov	eax, ERR_NOT_OWNER ; 'permission denied !' error
  2281                              <1> sndc_perm_error:
  2282 00012E62 A3[64030300]        <1> 	mov	[u.r0], eax
  2283 00012E67 A3[C8030300]        <1> 	mov	[u.error], eax
  2284 00012E6C E95BAAFFFF          <1> 	jmp	error
  2285                              <1> sndc_init0:
  2286 00012E71 A2[39940100]        <1> 	mov	[audio_user], al
  2287                              <1> sndc_init1:
  2288 00012E76 8915[3C940100]      <1> 	mov	[audio_cb_addr], edx
  2289 00012E7C 881D[3A940100]      <1> 	mov	[audio_cb_mode], bl
  2290 00012E82 880D[3B940100]      <1> 	mov	[audio_srb], cl
  2291                              <1> 
  2292                              <1> 	; 27/07/2020
  2293                              <1> 	;mov	byte [audio_flag], 0  ; clear dma half buffer flag
  2294                              <1> 
  2295                              <1> 	; 24/04/2017
  2296 00012E88 803D[11940100]03    <1> 	cmp	byte [audio_device], 3 ; VT8233 (VT8237R)
  2297 00012E8F 7438                <1> 	je	short sndc_init_9
  2298                              <1> 	;ja	short soundc_respond_err ; temporary (28/05/2017)
  2299 00012E91 803D[11940100]01    <1> 	cmp	byte [audio_device], 1 ; SB 16
  2300 00012E98 7510                <1> 	jne	short sndc_init_13
  2301 00012E9A BB[864C0100]        <1> 	mov	ebx, sb16_int_handler
  2302                              <1> 	; Note: 'SbInit' is at 'Start to Play' stage
  2303                              <1> 	; 20/05/2017
  2304 00012E9F 66C705[46940100]08- <1> 	mov	word [audio_master_volume], 0808h ; 2/8
  2304 00012EA7 08                  <1>
  2305 00012EA8 EB3F                <1> 	jmp	short sndc_init_10
  2306                              <1> sndc_init_13:
  2307                              <1> 	; 28/05/2017
  2308 00012EAA 803D[11940100]02    <1> 	cmp	byte [audio_device], 2 ; AC 97 (ICH)	
  2309 00012EB1 0F8562FEFFFF        <1> 	jne	soundc_respond_err ; temporary (28/05/2017)
  2310                              <1> 
  2311 00012EB7 E81F1F0000          <1> 	call	ac97_codec_config
  2312 00012EBC 0F8257FEFFFF        <1> 	jc	soundc_respond_err ; codec error !
  2313                              <1> 
  2314 00012EC2 BB[C24F0100]        <1> 	mov	ebx, ac97_int_handler
  2315 00012EC7 EB20                <1> 	jmp	short sndc_init_10	
  2316                              <1> 
  2317                              <1> sndc_init_9:
  2318                              <1> 	;call	reset_codec
  2319                              <1> 	;; eax = 1
  2320                              <1> 	;call	codec_io_w16 ; w32
  2321 00012EC9 E8E6170000          <1> 	call	init_codec ; 28/05/2017
  2322 00012ECE 0F8245FEFFFF        <1> 	jc	soundc_respond_err ; codec error !
  2323                              <1> 
  2324 00012ED4 E80D1A0000          <1> 	call	channel_reset
  2325                              <1> 
  2326                              <1> 	; setup the Codec (actually mixer registers) 
  2327 00012ED9 E82D190000          <1>         call    codec_config  ; unmute codec, set rates.
  2328 00012EDE 0F8235FEFFFF        <1> 	jc	soundc_respond_err ; codec error !
  2329                              <1> 
  2330 00012EE4 BB[78480100]        <1> 	mov	ebx, vt8233_int_handler
  2331                              <1> sndc_init_10:
  2332                              <1> 	; 13/04/2017
  2333 00012EE9 A0[13940100]        <1> 	mov	al, [audio_intr] ; IRQ number	
  2334 00012EEE E82BFDFFFF          <1> 	call	set_dev_IRQ_service
  2335                              <1> 
  2336                              <1> 	; SETUP (audio) INTERRUPT CALLBACK SERVICE
  2337 00012EF3 8A1D[13940100]      <1> 	mov	bl, [audio_intr] ; IRQ number
  2338 00012EF9 8A3D[3A940100]      <1> 	mov	bh, [audio_cb_mode]
  2339 00012EFF FEC7                <1> 	inc	bh  ; 1 = Signal Response Byte method (fixed value)
  2340                              <1> 		    ; 2 = Callback service method
  2341                              <1> 		    ; 3 = Auto Increment S.R.B. method 	
  2342 00012F01 8A0D[3B940100]      <1> 	mov	cl, [audio_srb]
  2343 00012F07 8B15[3C940100]      <1> 	mov	edx, [audio_cb_addr]
  2344 00012F0D A0[39940100]        <1> 	mov	al, [audio_user]
  2345                              <1> 	; 14/04/2017
  2346 00012F12 E8E1040000          <1>  	call	set_irq_callback_service
  2347                              <1> 	; 16/04/2017
  2348 00012F17 A3[64030300]        <1> 	mov	[u.r0], eax
  2349                              <1> 	;jnc	sysret
  2350 00012F1C 7316                <1> 	jnc	short sndc_init2 ; 21/04/2017
  2351                              <1> 	;
  2352 00012F1E A3[C8030300]        <1> 	mov	dword [u.error], eax
  2353                              <1> 
  2354 00012F23 A0[13940100]        <1> 	mov	al, [audio_intr] ; IRQ number	
  2355 00012F28 31DB                <1> 	xor	ebx, ebx ; reset IRQ handler address
  2356 00012F2A E8EFFCFFFF          <1> 	call	set_dev_IRQ_service
  2357                              <1> 
  2358 00012F2F E998A9FFFF          <1> 	jmp	error
  2359                              <1> 
  2360                              <1> sndc_init2:
  2361                              <1> 	; 21/04/2017
  2362 00012F34 8B0D[2C940100]      <1> 	mov	ecx, [audio_buff_size] ; audio buffer size
  2363 00012F3A D1E1                <1> 	shl	ecx, 1 ; *2
  2364 00012F3C A1[30940100]        <1> 	mov	eax, [audio_dma_buff]
  2365 00012F41 21C0                <1> 	and	eax, eax
  2366 00012F43 7415                <1> 	jz	short sndc_init3
  2367                              <1> 
  2368 00012F45 8B15[34940100]      <1> 	mov	edx, [audio_dmabuff_size] ; dma buffer size
  2369 00012F4B 39D1                <1> 	cmp	ecx, edx
  2370 00012F4D 744D                <1> 	je	short sndc_init5
  2371                              <1> 
  2372 00012F4F 87CA                <1> 	xchg	ecx, edx
  2373 00012F51 E82A37FFFF          <1> 	call	deallocate_memory_block
  2374 00012F56 87D1                <1> 	xchg	edx, ecx
  2375 00012F58 31C0                <1> 	xor	eax, eax
  2376                              <1> sndc_init3:
  2377                              <1> 	; 12/05/2017
  2378 00012F5A 803D[11940100]01    <1> 	cmp	byte [audio_device], 1 ; SB 16
  2379 00012F61 7515                <1> 	jne	short sndc_init4
  2380 00012F63 C705[30940100]-     <1> 	mov	dword [audio_dma_buff], sb16_dma_buffer
  2380 00012F69 [00000200]          <1>
  2381 00012F6D C705[34940100]0000- <1> 	mov	dword [audio_dmabuff_size], 65536
  2381 00012F75 0100                <1>
  2382                              <1> 	;xor	eax, eax
  2383                              <1> 	;mov	[u.r0], eax ; 0 = no error, successful
  2384 00012F77 C3                  <1> 	retn 
  2385                              <1> 
  2386                              <1> sndc_init4:
  2387                              <1> 	; EAX = Beginning address (physical)
  2388                              <1> 	; EAX = 0 -> Allocate mem block from the 1st proper aperture	
  2389                              <1> 	; ECX = Number of bytes to be allocated	(>0)	
  2390 00012F78 E8F634FFFF          <1> 	call	allocate_memory_block
  2391 00012F7D 0F828FFDFFFF        <1> 	jc	sound_buff_error
  2392                              <1> 
  2393                              <1> 	; set dma buffer address and size parameters
  2394 00012F83 A3[30940100]        <1> 	mov	[audio_dma_buff], eax ; dma buffer address
  2395 00012F88 890D[34940100]      <1> 	mov	[audio_dmabuff_size], ecx ; dma buffer size
  2396                              <1> ;	; EAX = Beginning (physical) addr of the allocated mem block
  2397                              <1> ;	; ECX = Num of allocated bytes (rounded up to page borders)
  2398                              <1> ;	cmp	byte [audio_pci], 0 ; AC97 audio controller ?
  2399                              <1> ;	ja	short sndc_init4
  2400                              <1> ;
  2401                              <1> ;	; Sound Blaster 16 uses classic DMA
  2402                              <1> ;	mov	edx, eax
  2403                              <1> ;	add	edx, ecx
  2404                              <1> ;	cmp	edx, 1000000h ; 1st 16 MB
  2405                              <1> ;	jna	short sndc_init4
  2406                              <1> ;
  2407                              <1> ;	; error !
  2408                              <1> ;	; restore Memory Allocation Table Content
  2409                              <1> ;	; EAX = Beginning address (physical)
  2410                              <1> ;	; ECX = Number of bytes to be deallocated
  2411                              <1> ;	call	deallocate_memory_block
  2412                              <1> ;	; reset dma buffer address and size parameters
  2413                              <1> ;	xor	eax, eax ; 0
  2414                              <1> ;	mov	[audio_dma_buff], eax ; 0
  2415                              <1> ;	mov	[audio_dmabuff_size], ecx ; 0
  2416                              <1> ;	jmp	sound_buff_error				
  2417                              <1> ;
  2418                              <1> ;sndc_init4:
  2419 00012F8E 803D[11940100]03    <1> 	cmp	byte [audio_device], 3
  2420                              <1> 	;jne	short sndc_init5
  2421 00012F95 7506                <1> 	jne	short sndc_init14 ; 28/05/2017
  2422 00012F97 E88B190000          <1> 	call	set_vt8233_bdl	
  2423                              <1> sndc_init5:
  2424                              <1> 	;sub	eax, eax ; 0
  2425                              <1> 	;mov	[u.r0], eax ; 0 = no error, successful
  2426 00012F9C C3                  <1> 	retn
  2427                              <1> sndc_init14:
  2428 00012F9D E8521F0000          <1> 	call	set_ac97_bdl
  2429                              <1> 	;jmp	short sndc_init5
  2430 00012FA2 C3                  <1> 	retn
  2431                              <1> 
  2432                              <1> sound_play:
  2433                              <1> 	; FUNCTION = 4 
  2434                              <1> 	; bl = Mode 
  2435                              <1> 	;      bit 0 = mono/stereo (1 = stereo)		
  2436                              <1> 	;      bit 1 = 8 bit / 16 bit (1 = 16 bit)
  2437                              <1> 	; cx = Sampling Rate (Hz)
  2438                              <1> 
  2439                              <1> 	; 13/06/2017
  2440                              <1> 	; Note: Even if Mode bits are not 11b,
  2441                              <1> 	; 	AC'97 Audio Controller (&Codec)
  2442                              <1> 	;	will play audio samples as 16 bit, stereo
  2443                              <1> 	;	samples.
  2444                              <1> 	;	(Program must fill the audio buffer
  2445                              <1> 	;	as required; 8 bit samples must be converted
  2446                              <1> 	;	to 16 bit samples and mono samples must be
  2447                              <1> 	;	converted to stereo samples...)
  2448                              <1> 	; 
  2449                              <1> 	; 28/07/2020
  2450                              <1> 	; 27/07/2020	 	
  2451                              <1> 	; 28/05/2017
  2452                              <1> 	; 15/05/2017, 20/05/2017
  2453                              <1> 	; 21/04/2017, 24/04/2017
  2454                              <1> 	; ... device check at first
  2455 00012FA3 A0[11940100]        <1> 	mov	al, [audio_device]
  2456 00012FA8 08C0                <1> 	or	al, al ; 0 ; pc speaker or invalid 
  2457 00012FAA 0F843AF4FEFF        <1> 	jz	beeper_gfx ; 'video.s' ; temporary !
  2458                              <1> ;	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2459                              <1> ;	je	short snd_play_1
  2460                              <1> ;	cmp	al, 1 ; SB 16
  2461                              <1> ;	jne	soundc_dev_err ; temporary !
  2462                              <1> ;snd_play_0:
  2463                              <1> 	; ... buffer & (buffer) owner check at second
  2464 00012FB0 833D[24940100]00    <1> 	cmp	dword [audio_buffer], 0
  2465 00012FB7 0F8655FDFFFF        <1> 	jna	sound_buff_error
  2466 00012FBD A0[B3030300]        <1> 	mov	al, [u.uno]
  2467 00012FC2 3A05[39940100]      <1> 	cmp	al, [audio_user]
  2468 00012FC8 0F858FFEFFFF        <1> 	jne	sndc_owner_error
  2469                              <1> 
  2470 00012FCE 66890D[42940100]    <1> 	mov	[audio_freq], cx ; sample frequency (Hertz)
  2471 00012FD5 88D8                <1> 	mov	al, bl
  2472 00012FD7 2401                <1> 	and	al, 1 ; mono/stereo (1= stereo)
  2473 00012FD9 FEC0                <1> 	inc	al ; channels
  2474 00012FDB A2[41940100]        <1> 	mov	[audio_stmo], al ; sound channels (1 or 2)
  2475 00012FE0 B008                <1> 	mov	al, 8
  2476 00012FE2 F6C302              <1> 	test	bl, 2 ; bits per sample (1= 16 bit)
  2477 00012FE5 7402                <1> 	jz	short snd_play_bps
  2478 00012FE7 D0E0                <1> 	shl	al, 1  
  2479                              <1> snd_play_bps:	
  2480 00012FE9 A2[40940100]        <1> 	mov	[audio_bps], al
  2481                              <1> 
  2482                              <1> 	; Transfer ring 3 (user's) audio buffer content to dma buffer
  2483 00012FEE 8B3D[30940100]      <1> 	mov	edi, [audio_dma_buff] ; dma buffer (ring 0)
  2484 00012FF4 09FF                <1> 	or	edi, edi
  2485 00012FF6 0F8416FDFFFF        <1> 	jz	sound_buff_error
  2486                              <1> 
  2487                              <1> 	; 27/07/2020
  2488                              <1> 
  2489 00012FFC 8B35[28940100]      <1> 	mov	esi, [audio_p_buffer] ; physical address (ring 3)
  2490                              <1> 	;mov	ecx, [audio_buff_size] ; 15/05/2017
  2491 00013002 8B0D[34940100]      <1> 	mov	ecx, [audio_dmabuff_size] ; 27/07/2020
  2492                              <1> 	;or	ecx, ecx 
  2493                              <1> 	;jz	sound_buff_error
  2494                              <1> 	; 28/07/2020
  2495 00013008 D1E9                <1> 	shr	ecx, 1  ; dma half buffer size
  2496                              <1> 
  2497 0001300A 8035[38940100]01    <1> 	xor	byte [audio_flag], 1 ;  0 -> 1, 1 -> 0
  2498 00013011 7502                <1> 	jnz	short snd_play_0 ; [audio_flag] = 1
  2499                              <1> 				 ; fill dma half buffer 1
  2500                              <1> 	; [audio_flag] = 0
  2501                              <1> 	
  2502                              <1> 	; fill dma half buffer 2
  2503 00013013 01CF                <1> 	add	edi, ecx
  2504                              <1> 
  2505                              <1> snd_play_0:
  2506                              <1> 	;rep	movsb
  2507 00013015 C1E902              <1> 	shr	ecx, 2  ; convert byte count to dword count
  2508 00013018 F3A5                <1> 	rep	movsd
  2509                              <1> 
  2510                              <1> 	; here, if [audio_flag] = 0, interrupt handler will update
  2511                              <1> 				; dma half buffer 2 
  2512                              <1> 				; (user's audio buffer data will be 
  2513                              <1> 				; copied into dma half buffer 2) 
  2514                              <1> 	;; 20/05/2017
  2515                              <1> 	;mov	byte [audio_flag], 1 ; next half (on next time)
  2516                              <1> 
  2517                              <1> 	; 24/04/2017
  2518 0001301A A0[11940100]        <1> 	mov	al, [audio_device]
  2519 0001301F 3C03                <1> 	cmp	al, 3 ; VT8233 (VT8237R) 
  2520 00013021 7410                <1> 	je	short snd_play_1
  2521 00013023 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2522 00013025 7512                <1> 	jne	short snd_play_2  ; 28/05/2017
  2523 00013027 E8031B0000          <1> 	call	SbInit_play
  2524 0001302C 0F82E7FCFFFF        <1> 	jc	soundc_respond_err
  2525 00013032 C3                  <1> 	retn
  2526                              <1> 
  2527                              <1> snd_play_1:	
  2528 00013033 E826190000          <1> 	call	vt8233_start_play
  2529 00013038 C3                  <1> 	retn
  2530                              <1> 
  2531                              <1> snd_play_2:
  2532                              <1> 	; 28/05/2017
  2533                              <1> 	;cmp	al, 2 ; AC'97
  2534                              <1> 	;jne	short snd_play_3
  2535                              <1> 
  2536 00013039 E8EA1E0000          <1> 	call	ac97_start_play
  2537 0001303E C3                  <1> 	retn
  2538                              <1> 
  2539                              <1> ;snd_play_3:
  2540                              <1> ;	;call	hda_start_play
  2541                              <1> ;	retn
  2542                              <1> 
  2543                              <1> sound_pause:
  2544                              <1> 	; FUNCTION = 5
  2545                              <1> 	; Pause
  2546                              <1> 	; 28/05/2017
  2547                              <1> 	; 24/04/2017
  2548                              <1> 	; 22/04/2017
  2549 0001303F E814030000          <1> 	call	snd_dev_check
  2550 00013044 7275                <1> 	jc	short snd_nothing ; temporary.
  2551 00013046 E81A030000          <1> 	call	snd_buf_check
  2552 0001304B 726E                <1> 	jc	short snd_nothing ; temporary.
  2553 0001304D A0[11940100]        <1> 	mov	al, [audio_device]
  2554 00013052 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2555 00013054 7409                <1> 	je	short snd_pause_1
  2556 00013056 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2557 00013058 750A                <1> 	jne	short snd_pause_2 ; 28/05/2017
  2558 0001305A E9AE1C0000          <1> 	jmp	sb16_pause
  2559                              <1> snd_pause_1:
  2560 0001305F E9B3190000          <1> 	jmp	vt8233_pause
  2561                              <1> snd_pause_2:
  2562                              <1> 	; 28/05/2017
  2563                              <1> 	;cmp	al, 2 ; AC'97
  2564                              <1> 	;jne	short snd_nothing ; temporary.
  2565 00013064 E94D200000          <1> 	jmp	ac97_pause
  2566                              <1> 
  2567                              <1> sound_continue:
  2568                              <1> 	; FUNCTION = 6
  2569                              <1> 	; Continue to play
  2570                              <1> 	; 28/05/2017
  2571                              <1> 	; 22/04/2017
  2572 00013069 E8EA020000          <1> 	call	snd_dev_check
  2573 0001306E 724B                <1> 	jc	short snd_nothing ; temporary.
  2574 00013070 E8F0020000          <1> 	call	snd_buf_check
  2575 00013075 7244                <1> 	jc	short snd_nothing ; temporary.
  2576 00013077 A0[11940100]        <1> 	mov	al, [audio_device]
  2577 0001307C 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2578 0001307E 7409                <1> 	je	short snd_cont_1
  2579 00013080 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2580 00013082 750A                <1> 	jne	short snd_cont_2 ; 28/05/2017
  2581 00013084 E9A71C0000          <1> 	jmp	sb16_continue
  2582                              <1> snd_cont_1:
  2583 00013089 E93A190000          <1> 	jmp	vt8233_play
  2584                              <1> snd_cont_2:
  2585                              <1> 	; 28/05/2017
  2586                              <1> 	;cmp	al, 2 ; AC'97
  2587                              <1> 	;jne	short snd_nothing ; temporary.
  2588 0001308E E9EB1E0000          <1> 	jmp	ac97_play
  2589                              <1> 
  2590                              <1> sound_stop:
  2591                              <1> 	; FUNCTION = 7
  2592                              <1> 	; Stop playing
  2593                              <1> 	; 28/05/2017
  2594                              <1> 	; 24/05/2017
  2595                              <1> 	; 21/04/2017, 22/04/2017, 24/04/2017
  2596 00013093 E8C0020000          <1> 	call	snd_dev_check
  2597 00013098 7221                <1> 	jc	short snd_nothing ; temporary.
  2598                              <1> 	;call	snd_buf_check
  2599 0001309A E8CF020000          <1> 	call	snd_user_check ; 24/05/2017
  2600 0001309F 721A                <1> 	jc	short snd_nothing ; temporary.	
  2601                              <1> 	
  2602 000130A1 A0[11940100]        <1> 	mov	al, [audio_device]
  2603 000130A6 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2604 000130A8 0F8470180000        <1> 	je	vt8233_stop
  2605                              <1> 	; 28/05/2017
  2606                              <1> 	;ja	short snd_nothing
  2607 000130AE 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2608 000130B0 0F849D1C0000        <1> 	je	sb16_stop
  2609                              <1> 	;cmp	al, 2 
  2610                              <1> 	;je	short ac97_stop
  2611 000130B6 E9CD1F0000          <1> 	jmp	ac97_stop ; temporary.
  2612                              <1> 	;jmp	hda_stop
  2613                              <1> 
  2614                              <1> snd_nothing:
  2615                              <1> 	; 21/04/2017
  2616 000130BB C3                  <1> 	retn
  2617                              <1> 
  2618                              <1> soundc_reset:
  2619                              <1> 	; FUNCTION = 8
  2620                              <1> 	; Reset Audio Controller
  2621                              <1> 	; 28/05/2017
  2622                              <1> 	; 22/04/2017
  2623 000130BC E897020000          <1> 	call	snd_dev_check
  2624 000130C1 72F8                <1> 	jc	snd_nothing ; temporary.
  2625 000130C3 E89D020000          <1> 	call	snd_buf_check
  2626 000130C8 72F1                <1> 	jc	snd_nothing ; temporary.	
  2627                              <1> 	
  2628 000130CA A0[11940100]        <1> 	mov	al, [audio_device]
  2629 000130CF 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2630 000130D1 0F844C190000        <1> 	je	vt8233_reset
  2631 000130D7 77E2                <1> 	ja	short snd_nothing ; temporary.
  2632                              <1> 	;ja	hda_reset	
  2633 000130D9 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2634 000130DB 0F8526200000        <1> 	jne	ac97_reset	
  2635 000130E1 E8BF1C0000          <1> 	call	sb16_reset
  2636 000130E6 0F822DFCFFFF        <1> 	jc	soundc_respond_err
  2637 000130EC C3                  <1> 	retn
  2638                              <1> 
  2639                              <1> soundc_cancel:
  2640                              <1> 	; FUNCTION = 9
  2641                              <1> 	; Cancel audio callback service
  2642                              <1> 	; 22/04/2017
  2643 000130ED A0[39940100]        <1> 	mov	al, [audio_user]	
  2644 000130F2 3A05[B3030300]      <1> 	cmp	al, [u.uno]
  2645 000130F8 75C1                <1> 	jne	short snd_nothing
  2646                              <1> 	; RESET (audio) INTERRUPT CALLBACK SERVICE
  2647 000130FA 8A1D[13940100]      <1> 	mov	bl, [audio_intr] ; IRQ number
  2648 00013100 A0[B3030300]        <1> 	mov	al, [u.uno]
  2649 00013105 28FF                <1> 	sub	bh, bh ; 0 ; unlink IRQ from user service
  2650 00013107 E8EC020000          <1>  	call	set_irq_callback_service
  2651 0001310C 0F8250FDFFFF        <1> 	jc	sndc_perm_error ; 'permission denied' error
  2652 00013112 C3                  <1> 	retn
  2653                              <1> 
  2654                              <1> sound_dalloc:
  2655                              <1> 	; FUNCTION = 10
  2656                              <1> 	; Deallocate (ring 3) audio buffer
  2657                              <1> 	; 22/04/2017
  2658 00013113 A0[39940100]        <1> 	mov	al, [audio_user]	
  2659 00013118 3A05[B3030300]      <1> 	cmp	al, [u.uno]
  2660 0001311E 759B                <1> 	jne	short snd_nothing
  2661 00013120 8B1D[24940100]      <1> 	mov	ebx, [audio_buffer]
  2662                              <1> 	;or	ebx, ebx
  2663                              <1> 	;jz	short snd_nothing
  2664 00013126 8B0D[2C940100]      <1> 	mov	ecx, [audio_buff_size]
  2665 0001312C E89D36FFFF          <1> 	call	deallocate_user_pages
  2666 00013131 31C0                <1> 	xor	eax, eax
  2667 00013133 A3[24940100]        <1> 	mov	[audio_buffer], eax ; 0
  2668 00013138 A2[39940100]        <1> 	mov	[audio_user], al ; 0
  2669 0001313D C3                  <1> 	retn
  2670                              <1> 
  2671                              <1> sound_volume:
  2672                              <1> 	; FUNCTION = 11
  2673                              <1> 	; Set sound volume level
  2674                              <1> 	; 28/05/2017
  2675                              <1> 	; 20/05/2017
  2676                              <1> 	; 22/04/2017, 24/04/2017
  2677                              <1> 	; bl = component (0 = master/playback/lineout volume)
  2678                              <1> 	; cl = left channel volume level (0 to 31)
  2679                              <1> 	; ch = right channel volume level (0 to 31)
  2680                              <1> 
  2681 0001313E 80FB80              <1> 	cmp	bl, 80h
  2682 00013141 720E                <1> 	jb	short snd_vol_1
  2683 00013143 0F8772FFFFFF        <1> 	ja	snd_nothing ; temporary.
  2684                              <1> 	; Set volume level for next play (BL>= 80h)
  2685 00013149 66890D[46940100]    <1> 	mov	[audio_master_volume], cx
  2686 00013150 C3                  <1> 	retn
  2687                              <1> snd_vol_1:
  2688                              <1> 	; set volume level immediate (BL< 80h)
  2689 00013151 80FB00              <1> 	cmp	bl, 0
  2690 00013154 0F8761FFFFFF        <1> 	ja	snd_nothing ; temporary.
  2691                              <1> 
  2692 0001315A E8F9010000          <1> 	call	snd_dev_check
  2693 0001315F 0F8256FFFFFF        <1> 	jc	snd_nothing ; temporary.
  2694 00013165 E8FB010000          <1> 	call	snd_buf_check
  2695 0001316A 0F824BFFFFFF        <1> 	jc	snd_nothing ; temporary.	
  2696                              <1> 
  2697 00013170 A0[11940100]        <1> 	mov	al, [audio_device]
  2698 00013175 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2699 00013177 0F84BF180000        <1> 	je	vt8233_volume
  2700                              <1> 	; 28/05/2017
  2701 0001317D 0F8738FFFFFF        <1> 	ja	snd_nothing ; temporary.
  2702                              <1> 	;ja	hda_volume	
  2703                              <1> 	; Sound Blaster 16
  2704 00013183 3C01                <1> 	cmp	al, 1 ; SB 16
  2705 00013185 0F844D1B0000        <1> 	je	sb16_volume
  2706 0001318B E90A1E0000          <1> 	jmp	ac97_volume
  2707                              <1> 
  2708                              <1> soundc_disable:
  2709                              <1> 	; FUNCTION = 12 
  2710                              <1> 	; Disable audio device (and unlink DMA memory)
  2711                              <1> 	; 28/05/2017
  2712                              <1> 	; 24/05/2017
  2713                              <1> 	; 22/04/2017
  2714 00013190 E8C3010000          <1> 	call	snd_dev_check
  2715 00013195 0F8270FBFFFF        <1> 	jc	soundc_dev_err ; temporary.
  2716                              <1> 	;call	snd_buf_check
  2717                              <1> 	;jc	sndc_owner_error ; temporary.
  2718                              <1> 
  2719 0001319B A0[11940100]        <1> 	mov	al, [audio_device]
  2720 000131A0 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2721 000131A2 7418                <1> 	je	short snd_disable_1
  2722 000131A4 0F8711FFFFFF        <1> 	ja	snd_nothing ; temporary.
  2723 000131AA 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2724 000131AC 7507                <1> 	jne	short snd_disable_0
  2725 000131AE E8A01B0000          <1> 	call	sb16_stop
  2726 000131B3 EB0C                <1> 	jmp	short snd_disable_2
  2727                              <1> snd_disable_0:
  2728 000131B5 E8CE1E0000          <1> 	call	ac97_stop
  2729 000131BA EB05                <1> 	jmp	short snd_disable_2
  2730                              <1> snd_disable_1:
  2731 000131BC E85D170000          <1> 	call	vt8233_stop
  2732                              <1> snd_disable_2:
  2733 000131C1 A0[13940100]        <1> 	mov	al, [audio_intr]
  2734 000131C6 29DB                <1> 	sub	ebx, ebx ; 0 = reset
  2735 000131C8 E851FAFFFF          <1> 	call	set_dev_IRQ_service
  2736                              <1> 
  2737                              <1> 	;mov	al, [audio_intr]
  2738 000131CD 28E4                <1> 	sub	ah, ah ; 0 = reset
  2739 000131CF E8B5F6FFFF          <1> 	call	set_hardware_int_vector
  2740                              <1> 
  2741 000131D4 31C0                <1> 	xor	eax, eax
  2742 000131D6 A2[11940100]        <1> 	mov	byte [audio_device], al
  2743 000131DB A2[13940100]        <1> 	mov	byte [audio_intr], al
  2744 000131E0 8705[30940100]      <1> 	xchg	eax, [audio_dma_buff]
  2745                              <1> 	; 24/05/2017
  2746                              <1> 	;or	eax, eax
  2747                              <1> 	;jz	short snd_disable_3
  2748                              <1> 	;cmp	eax, sb16_dma_buffer ; default DMA buffer
  2749                              <1> 	;je	short snd_disable_3
  2750 000131E6 803D[10940100]00    <1> 	cmp	byte [audio_pci], 0 ; AC97 audio controller ?
  2751 000131ED 7612                <1> 	jna	short snd_disable_3
  2752 000131EF C605[10940100]00    <1> 	mov	byte [audio_pci], 0
  2753                              <1> 	;sub	ecx, ecx
  2754                              <1> 	;xchg	ecx, [audio_dmabuff_size]
  2755 000131F6 8B0D[34940100]      <1> 	mov	ecx, [audio_dmabuff_size]
  2756 000131FC E87F34FFFF          <1> 	call	deallocate_memory_block
  2757                              <1> snd_disable_3:
  2758 00013201 C3                  <1> 	retn
  2759                              <1> 
  2760                              <1> sound_dma_map:
  2761                              <1> 	; FUNCTION = 13 
  2762                              <1> 	; Map audio dma buff addr to user's buffer addr
  2763                              <1> 	; 12/05/2017
  2764 00013202 21C9                <1> 	and	ecx, ecx
  2765 00013204 0F8408FBFFFF        <1> 	jz	sound_buff_error
  2766 0001320A 803D[11940100]01    <1> 	cmp	byte [audio_device], 1
  2767 00013211 7229                <1> 	jb	short snd_dma_map_1
  2768                              <1> snd_dma_map_0:
  2769 00013213 A1[30940100]        <1> 	mov	eax, [audio_dma_buff]
  2770 00013218 21C0                <1> 	and	eax, eax
  2771 0001321A 7420                <1> 	jz	short snd_dma_map_1
  2772                              <1> 	;
  2773 0001321C 8A1D[39940100]      <1> 	mov	bl, [audio_user]
  2774 00013222 08DB                <1> 	or	bl, bl
  2775 00013224 7416                <1> 	jz	short snd_dma_map_1
  2776 00013226 3A1D[B3030300]      <1> 	cmp	bl, [u.uno]
  2777 0001322C 0F852BFCFFFF        <1> 	jne	sndc_owner_error
  2778                              <1> 	;
  2779 00013232 8B1D[34940100]      <1> 	mov	ebx, [audio_dmabuff_size]
  2780 00013238 21DB                <1> 	and	ebx, ebx
  2781 0001323A 750A                <1> 	jnz	short snd_dma_map_2
  2782                              <1> snd_dma_map_1:
  2783 0001323C B8[00000200]        <1> 	mov	eax, sb16_dma_buffer
  2784 00013241 BB00000100          <1> 	mov	ebx, 65536
  2785                              <1> snd_dma_map_2:	
  2786 00013246 81C1FF0F0000        <1> 	add	ecx, PAGE_SIZE-1 ; 4095
  2787 0001324C 6681E100F0          <1> 	and	cx, ~PAGE_OFF ; not 4095
  2788 00013251 39D9                <1> 	cmp	ecx, ebx
  2789 00013253 0F87B9FAFFFF        <1> 	ja	sound_buff_error
  2790 00013259 50                  <1> 	push	eax
  2791 0001325A 89D3                <1> 	mov	ebx, edx
  2792 0001325C C1E90C              <1> 	shr	ecx, 12 ; byte count to page count
  2793                              <1> 	; eax = physical address of (audio) dma buffer
  2794                              <1> 	; ebx = virtual address of (audio) dma buffer (user's pgdir) 
  2795                              <1> 	; ecx = page count (>0)
  2796 0001325F E88C34FFFF          <1> 	call	direct_memory_access
  2797 00013264 58                  <1> 	pop	eax
  2798 00013265 0F82A7FAFFFF        <1> 	jc	sound_buff_error
  2799 0001326B A3[64030300]        <1> 	mov	[u.r0], eax
  2800 00013270 C3                  <1> 	retn
  2801                              <1> 
  2802                              <1> soundc_info:
  2803                              <1> 	; FUNCTION = 14 
  2804                              <1> 	; Get Audio Controller Info
  2805                              <1> 	; 10/06/2017
  2806                              <1> 	; 05/06/2017
  2807 00013271 20DB                <1> 	and	bl, bl ; 0
  2808 00013273 740A                <1> 	jz	short sndc_info_0
  2809                              <1> 	; invalid parameter !
  2810 00013275 B817000000          <1> 	mov	eax, ERR_INV_PARAMETER ; 23
  2811                              <1> ;sndc_inf_error:
  2812                              <1> ;	mov	[u.r0], eax
  2813                              <1> ;	mov	[u.error], eax
  2814                              <1> ;	jmp	error
  2815 0001327A E99FFAFFFF          <1> 	jmp	sysaudio_err
  2816                              <1> 
  2817                              <1> sndc_info_0:
  2818 0001327F E8D4000000          <1> 	call	snd_dev_check
  2819 00013284 0F8281FAFFFF        <1> 	jc	soundc_dev_err
  2820                              <1> 
  2821 0001328A 8B1D[1C940100]      <1> 	mov	ebx, [audio_vendor]
  2822 00013290 8B0D[18940100]      <1> 	mov	ecx, [audio_dev_id]
  2823                              <1> 	;mov	al,  [audio_device]
  2824 00013296 3C02                <1> 	cmp	al, 2 ; AC'97 (ICH)
  2825 00013298 7513                <1> 	jne	short sndc_info_1
  2826                              <1> 	; Intel AC97 (ICH) Audio Controller (=2)	
  2827 0001329A 668B15[4A940100]    <1> 	mov	dx, [NABMBAR]
  2828 000132A1 C1E210              <1> 	shl	edx, 16
  2829 000132A4 668B15[48940100]    <1> 	mov	dx, [NAMBAR]
  2830 000132AB EB07                <1> 	jmp	short sndc_info_2
  2831                              <1> sndc_info_1:
  2832                              <1> 	; 05/06/2017
  2833                              <1> 	; Note: Intel HDA code (here) is not ready yet!
  2834                              <1> 	; !!! SB16 or VT8233 (VT8237R) !!!
  2835 000132AD 0FB715[16940100]    <1> 	movzx	edx, word [audio_io_base]	
  2836                              <1> sndc_info_2:
  2837 000132B4 88C4                <1> 	mov	ah, al ;  [audio_device]
  2838 000132B6 A0[13940100]        <1> 	mov	al, [audio_intr] 
  2839                              <1> 
  2840                              <1> 	; EAX = IRQ Number in AL
  2841                              <1> 	;	Audio Device Number in AH 
  2842                              <1> 	; EBX = DEV/VENDOR ID
  2843                              <1> 	;	(DDDDDDDDDDDDDDDDVVVVVVVVVVVVVVVV)
  2844                              <1> 	; ECX = BUS/DEV/FN 
  2845                              <1> 	;	(00000000BBBBBBBBDDDDDFFF00000000)
  2846                              <1> 	; EDX = NABMBAR/NAMBAR (for AC97)
  2847                              <1> 	;	(Low word, DX = NAMBAR address)
  2848                              <1> 	; EDX = Base IO Addr (DX) for SB16 & VT8233
  2849                              <1> 
  2850                              <1> 	; 10/06/2017
  2851 000132BB A3[64030300]        <1> 	mov	[u.r0], eax
  2852 000132C0 8B2D[60030300]      <1> 	mov	ebp, [u.usp]
  2853 000132C6 895D10              <1> 	mov	[ebp+16], ebx  ; ebx
  2854 000132C9 895514              <1> 	mov	[ebp+20], edx  ; edx
  2855 000132CC 894D18              <1> 	mov	[ebp+24], ecx  ; ecx
  2856                              <1>   			  		
  2857 000132CF C3                  <1>  	retn
  2858                              <1> 
  2859                              <1> sound_data:
  2860                              <1> 	; FUNCTION = 15 
  2861                              <1> 	; Get Current Sound data for graphics
  2862                              <1> 	; 22/06/2017
  2863                              <1> 	;
  2864 000132D0 E883000000          <1> 	call	snd_dev_check
  2865 000132D5 0F8230FAFFFF        <1> 	jc	soundc_dev_err ; Device not ready !
  2866                              <1> 
  2867 000132DB 80FB00              <1> 	cmp	bl, 0
  2868 000132DE 760A                <1> 	jna	short sound_data_0
  2869                              <1> 
  2870                              <1> 	; Only PCM OUT buffer data is valid for now!
  2871 000132E0 B817000000          <1> 	mov	eax, ERR_INV_PARAMETER  ; 23
  2872 000132E5 E934FAFFFF          <1> 	jmp	sysaudio_err
  2873                              <1> 
  2874                              <1> sound_data_0:
  2875 000132EA A1[30940100]        <1> 	mov	eax, [audio_dma_buff]
  2876 000132EF 09C0                <1> 	or	eax, eax
  2877 000132F1 0F841BFAFFFF        <1> 	jz	sound_buff_error
  2878                              <1> 
  2879 000132F7 803D[11940100]04    <1> 	cmp	byte [audio_device], 4 ; Intel HDA
  2880 000132FE 744F                <1> 	je	short sound_data_4 ; temporary ! (22/06/2017)
  2881                              <1> 
  2882 00013300 21C9                <1> 	and	ecx, ecx
  2883                              <1> 	;jnz	short sound_data_1 ; sample tranfer
  2884                              <1> 	
  2885                              <1> 	; Return only DMA Buffer pointer/offset... 
  2886                              <1> 	; (If DMA Buffer has been mapped to user's
  2887                              <1> 	;  memory space; program can get graphics
  2888                              <1> 	;  data by using only this pointer value.)
  2889                              <1> 	   	
  2890                              <1> 	;call	get_dma_buffer_offset
  2891                              <1> 	;; eax = DMA buffer offset
  2892                              <1> 	;;	(!not half buffer offset!)
  2893                              <1> 	;mov	[u.r0], eax
  2894                              <1> 	;retn
  2895                              <1> 
  2896 00013302 0F84771F0000        <1> 	jz	get_dma_buffer_offset	
  2897                              <1> 	
  2898                              <1> sound_data_1:
  2899                              <1> 	;mov	eax, [audio_dmabuff_size]
  2900                              <1> 	;shr	eax, 1 ; half buffer size
  2901                              <1> 	;cmp	ecx, eax
  2902                              <1> 	;ja	short sound_buff_error	
  2903                              <1> 
  2904 00013308 3B0D[34940100]      <1> 	cmp	ecx, [audio_dmabuff_size]
  2905 0001330E 0F87FEF9FFFF        <1> 	ja	sound_buff_error
  2906                              <1> 
  2907 00013314 89D0                <1> 	mov	eax, edx
  2908 00013316 25FF0F0000          <1> 	and	eax, PAGE_OFF ; 4095 (0FFFh)
  2909 0001331B 81F900100000        <1> 	cmp	ecx, 4096
  2910 00013321 7605                <1> 	jna	short sound_data_2
  2911 00013323 B900100000          <1> 	mov	ecx, 4096 ; max. 1 page
  2912                              <1> sound_data_2:
  2913 00013328 01C8                <1> 	add	eax, ecx
  2914 0001332A 3D00100000          <1> 	cmp	eax, 4096
  2915 0001332F 7606                <1> 	jna	short sound_data_3
  2916 00013331 6625FF0F            <1> 	and	ax, PAGE_OFF ; 4095 (0FFFh)
  2917 00013335 29C1                <1> 	sub	ecx, eax
  2918                              <1> 	; here, ECX has been adjusted to fit 
  2919                              <1> 	;	in page border..  (<= 4096, >0)
  2920                              <1> sound_data_3:
  2921 00013337 51                  <1> 	push	ecx
  2922 00013338 52                  <1> 	push	edx
  2923 00013339 89D3                <1> 	mov	ebx, edx 
  2924 0001333B E89E2FFFFF          <1> 	call	get_physical_addr
  2925 00013340 5A                  <1> 	pop	edx
  2926 00013341 59                  <1> 	pop	ecx
  2927 00013342 0F82CAF9FFFF        <1> 	jc	sound_buff_error	
  2928                              <1> 	
  2929                              <1> 	; eax = physical address of user's buffer
  2930 00013348 89C3                <1> 	mov	ebx, eax  
  2931                              <1> 	; ecx = byte (transfer) count
  2932                              <1> 	;call	get_current_sound_data
  2933                              <1> 	;retn
  2934 0001334A E98D1E0000          <1> 	jmp	get_current_sound_data
  2935                              <1> 
  2936                              <1> sound_data_4:
  2937                              <1> 	; Intel HDA code is not ready yet !
  2938                              <1> 	; 22/06/2017
  2939 0001334F 31C0                <1> 	xor	eax, eax
  2940 00013351 48                  <1> 	dec	eax
  2941 00013352 A3[64030300]        <1> 	mov	[u.r0], eax ; 0FFFFFFFFh
  2942 00013357 C3                  <1> 	retn 
  2943                              <1> 
  2944                              <1> snd_dev_check:
  2945                              <1> 	; 10/06/2017
  2946                              <1> 	; 05/06/2017
  2947                              <1> 	; 24/05/2017
  2948                              <1> 	; 22/04/2017
  2949                              <1> 	; 21/04/2017
  2950                              <1> 	; ... device check at first
  2951 00013358 A0[11940100]        <1> 	mov	al, [audio_device]
  2952 0001335D 3C01                <1> 	cmp	al, 1 ; SB 16
  2953 0001335F 7203                <1> 	jb	short snd_dev_chk_retn ; error !
  2954                              <1> 	;cmp	al, 4 ; Intel HDA
  2955                              <1> 	;ja	short snd_dbchk_stc ; invalid !
  2956                              <1> 	; 10/06/2017
  2957 00013361 3C05                <1> 	cmp	al, 5
  2958 00013363 F5                  <1> 	cmc
  2959                              <1> snd_dev_chk_retn:
  2960 00013364 C3                  <1> 	retn
  2961                              <1> 
  2962                              <1> snd_buf_check:
  2963                              <1> 	; 10/06/2017
  2964                              <1> 	; 22/04/2017
  2965                              <1> 	; 21/04/2017
  2966                              <1> 	; ... buffer & (buffer) owner check at second
  2967 00013365 833D[24940100]00    <1> 	cmp	dword [audio_buffer], 0
  2968 0001336C 760D                <1> 	jna	short snd_dbchk_stc
  2969                              <1> snd_user_check:
  2970 0001336E A0[B3030300]        <1> 	mov	al, [u.uno]
  2971 00013373 3A05[39940100]      <1> 	cmp	al, [audio_user]
  2972                              <1> 	;jne	short snd_dbchk_stc
  2973                              <1> 	;retn
  2974 00013379 74E9                <1> 	je	short snd_dev_chk_retn
  2975                              <1> 
  2976                              <1> snd_dbchk_stc:
  2977 0001337B F9                  <1> 	stc
  2978 0001337C C3                  <1> 	retn
  2979                              <1> 
  2980                              <1> sound_update:
  2981                              <1> 	; FUNCTION = 16 
  2982                              <1> 	; bl = 
  2983                              <1> 	;    0 = automatic (sequental) update (with flag switch!)
  2984                              <1> 	;    1 = update dma half buffer 1 (without flag switch!)		
  2985                              <1> 	;    2 = update dma half buffer 2 (without flag switch!)
  2986                              <1> 	;  FFh = get current flag value	
  2987                              <1> 	;      0 = dma half buffer 1 (will be played next)
  2988                              <1> 	;      1 = dma half buffer 2 (will be played next)
  2989                              <1> 	
  2990                              <1> 	; 10/10/2017
  2991                              <1> 	
  2992                              <1> 	; ... device check at first
  2993 0001337D A0[11940100]        <1> 	mov	al, [audio_device]
  2994 00013382 08C0                <1> 	or	al, al ; 0 ; pc speaker or invalid 
  2995 00013384 0F8481F9FFFF        <1> 	jz	soundc_dev_err
  2996                              <1> 
  2997                              <1> 	; ... buffer & (buffer) owner check at second
  2998 0001338A 833D[24940100]00    <1> 	cmp	dword [audio_buffer], 0
  2999 00013391 0F867BF9FFFF        <1> 	jna	sound_buff_error
  3000 00013397 A0[B3030300]        <1> 	mov	al, [u.uno]
  3001 0001339C 3A05[39940100]      <1> 	cmp	al, [audio_user]
  3002 000133A2 0F85B5FAFFFF        <1> 	jne	sndc_owner_error
  3003                              <1> 
  3004                              <1> 	; Transfer ring 3 (user's) audio buffer content to dma buffer
  3005 000133A8 8B3D[30940100]      <1> 	mov	edi, [audio_dma_buff] ; dma buffer (ring 0)
  3006 000133AE 09FF                <1> 	or	edi, edi
  3007 000133B0 0F845CF9FFFF        <1> 	jz	sound_buff_error
  3008 000133B6 8B35[28940100]      <1> 	mov	esi, [audio_p_buffer] ; physical address (ring 3)
  3009 000133BC 8B0D[2C940100]      <1> 	mov	ecx, [audio_buff_size]
  3010                              <1> 	
  3011                              <1> 	;movzx	eax, byte [audio_flag]
  3012 000133C2 A0[38940100]        <1> 	mov	al, [audio_flag]
  3013                              <1> 
  3014 000133C7 FEC3                <1> 	inc	bl
  3015 000133C9 7427                <1> 	jz	short snd_update_3 ; bl = 0FFh
  3016 000133CB FECB                <1> 	dec	bl 
  3017 000133CD 7411                <1> 	jz	short snd_update_0 ; bl = 0
  3018                              <1> 
  3019 000133CF 80FB02              <1> 	cmp	bl, 2
  3020 000133D2 7417                <1> 	je	short snd_update_1 ; dma half buffer 2
  3021 000133D4 7217                <1> 	jb	short snd_update_2 ; dma half buffer 1
  3022                              <1>  
  3023                              <1> 	; invalid parameter !
  3024 000133D6 B817000000          <1> 	mov	eax, ERR_INV_PARAMETER ; 23
  3025                              <1> ;	mov	[u.r0], eax
  3026                              <1> ;	mov	[u.error], eax
  3027                              <1> ;	jmp	error
  3028 000133DB E93EF9FFFF          <1> 	jmp	sysaudio_err
  3029                              <1> 	
  3030                              <1> snd_update_0:
  3031 000133E0 8035[38940100]01    <1> 	xor	byte [audio_flag], 1 ; update flag !!!
  3032 000133E7 3C01                <1> 	cmp	al, 1
  3033 000133E9 7202                <1> 	jb	short snd_update_2 ; dma half buffer 1
  3034                              <1> snd_update_1:
  3035                              <1> 	; dma half buffer 2
  3036 000133EB 01CF                <1> 	add	edi, ecx
  3037                              <1> snd_update_2:
  3038                              <1> 	;rep	movsb
  3039 000133ED C1E902              <1> 	shr	ecx, 2
  3040 000133F0 F3A5                <1> 	rep	movsd
  3041                              <1> snd_update_3:
  3042 000133F2 A3[64030300]        <1> 	mov	[u.r0], eax
  3043                              <1> 
  3044 000133F7 C3                  <1> 	retn
  3045                              <1> 	
  3046                              <1> set_irq_callback_service:
  3047                              <1> 	; 03/08/2020
  3048                              <1> 	; 10/06/2017
  3049                              <1> 	; 12/05/2017
  3050                              <1> 	; 24/04/2017
  3051                              <1> 	; 22/04/2017
  3052                              <1> 	; caller: 'syscalbac' or 'sysaudio' or ...
  3053                              <1> 	; 13/04/2017, 14/04/2017, 17/04/2017
  3054                              <1> 	; 24/02/2017, 26/02/2017, 28/02/2017
  3055                              <1> 	; 21/02/2017 - TRDOS 386 (TRDOS v2.0)
  3056                              <1> 	;
  3057                              <1> 	; Link or unlink IRQ callback service to/from user (ring 3)	
  3058                              <1> 	;
  3059                              <1> 	; INPUT ->
  3060                              <1> 	;	If AL = 0, the caller is 'syscalbac';
  3061                              <1> 	;	   otherwise, the caller is 'sysaudio' or ...
  3062                              <1> 	;	   (AL = user number) 
  3063                              <1> 	; 	 
  3064                              <1> 	;	BL = IRQ number (Hardware interrupt request number)
  3065                              <1> 	;	     (0 t0 15 but IRQ 0,1,2,6,8,14,15 are prohibited)
  3066                              <1> 	;	     IRQ numbers 3,4,5,7,9,10,11,12,13 are valid
  3067                              <1> 	;	     (numbers >15 are invalid)
  3068                              <1> 	;
  3069                              <1> 	;	BH = 0 = Unlink IRQ (in BL) from user (ring 3) service
  3070                              <1> 	;	     1 = Link IRQ by using Signal Response Byte method
  3071                              <1> 	;	     2 = Link IRQ by using Callback service method 		
  3072                              <1> 	;	     3 = Link IRQ by using Auto Increment S.R.B. method 	
  3073                              <1> 	;	    >3 = invalid 
  3074                              <1> 	;		 (syscallback version will return to user) 	
  3075                              <1> 	;	
  3076                              <1> 	;	CL = Signal Return/Response Byte value 
  3077                              <1> 	;
  3078                              <1> 	;	If BH = 3, kernel will put a counter value ; 03/08/2020
  3079                              <1> 	;	          (into the S.R.B. addr)
  3080                              <1> 	;		  between 0 to 255. (start value = CL+1)
  3081                              <1> 	;	
  3082                              <1> 	;	NOTE: counter value, for example: even and odd numbers
  3083                              <1> 	;	      may be used for -audio- DMA buffer switch 
  3084                              <1> 	;	      within double buffer method, etc. 		
  3085                              <1> 	;
  3086                              <1> 	;	EDX = Signal return (Response) byte address
  3087                              <1> 	;	       		  - or -
  3088                              <1> 	;	      Interrupt/Callback service/routine address
  3089                              <1> 	; 	
  3090                              <1> 	;	      (virtual address in user's memory space)
  3091                              <1> 	;
  3092                              <1> 	; OUTPUT ->
  3093                              <1> 	;	CF = 0 & EAX = 0 -> Successful setting
  3094                              <1> 	;	CF = 1 & EAX > 0 -> IRQ is prohibited or locked 
  3095                              <1> 	;			by another process
  3096                              <1> 	;		 eax = ERR_PERM_DENIED -> prohibited or locked
  3097                              <1> 	;		 eax = ERR_INV_PARAMETER -> 
  3098                              <1> 	;		       invalid parameter/option or bad address
  3099                              <1> 	;
  3100                              <1> 	; TRDOS 386 - IRQ CALLBACK structures (parameters):
  3101                              <1> 	;	
  3102                              <1> 	;	   [u.irqlock] = 1 word, IRQ flags (0-15) that indicates
  3103                              <1> 	;			which IRQs are locked by (that) user.
  3104                              <1> 	;		        Lock and unlock (by user) will change
  3105                              <1> 	;			these flags or 'terminate process' (sysexit)
  3106                              <1> 	;			will clear these flags and unlock those IRQs.
  3107                              <1> 	;			               
  3108                              <1> 	;		   	Bit 0 is for IRQ 0 and Bit 15 is for IRQ 15
  3109                              <1> 	;
  3110                              <1> 	;	   IRQ(x).owner	 : 1 byte, user, [u.uno], 0 = free (unlocked)	
  3111                              <1> 	;
  3112                              <1> 	;	   IRQ(x).method : 1 byte for callback method & status
  3113                              <1> 	;			   0 = Signal Response Byte method
  3114                              <1> 	;			   1 = Callback service method
  3115                              <1> 	;			   >1 = invalid for current 'syscalback'.
  3116                              <1> 	;			or(+) 80h = IRQ is in use by system (ring 0)
  3117                              <1> 	;			            function (audio etc.) or
  3118                              <1> 	;			   	    a device driver.	   	
  3119                              <1> 	;			(system function will ignore the lock/owner)
  3120                              <1> 	;
  3121                              <1> 	;	   IRQ(x).srb	: 1 byte, Signal Return/Response byte value
  3122                              <1> 	;			  (a fixed value by user or a counter value
  3123                              <1> 	;			 from 0 to 255, which is increased by every
  3124                              <1> 	;			 interrupt just before putting it into 
  3125                              <1> 	;			 the Signal Response byte address
  3126                              <1> 	;			 (This is not used in callback serv method)
  3127                              <1> 	;	    	  
  3128                              <1> 	;	   IRQ(x).addr	: 1 dword
  3129                              <1> 	;			  Signal Response Byte address (physical)
  3130                              <1> 	;			  		-or-
  3131                              <1> 	;			  Callback service address (virtual)
  3132                              <1> 	;
  3133                              <1> 	;	   IRQ(x).dev	: 1 byte
  3134                              <1> 	;			  0 = Default device or kernel function
  3135                              <1> 	;			  		-or-
  3136                              <1> 	;			  1-255 = Assigned device driver number
  3137                              <1> 	;
  3138                              <1> 	;	   (x) = 3,4,5,7,9,10,11,12,13
  3139                              <1> 	;
  3140                              <1> 	
  3141 000133F8 80FB0F              <1> 	cmp	bl, 15
  3142 000133FB 7729                <1> 	ja	short scbs_2
  3143                              <1> 	
  3144 000133FD 80FF03              <1> 	cmp	bh, 3
  3145 00013400 7724                <1> 	ja	short scbs_2  ; invalid parameter
  3146                              <1> 
  3147 00013402 0FB6FB              <1> 	movzx	edi, bl ; save IRQ number
  3148                              <1> 
  3149                              <1> 		;  IRQ 0,1,2,6,8,14,15 are prohibited
  3150                              <1> 	;IRQenum: ; 'trdosk9.s'
  3151                              <1> 	;	db  0,0,0,1,2,3,0,4,0,5,6,7,8,9,0,0
  3152                              <1> 
  3153 00013405 0FB6B7[58410100]    <1> 	movzx	esi, byte [edi+IRQenum] ; IRQ availability 
  3154                              <1> 					; enumeration/index
  3155                              <1> 	;dec	esi
  3156 0001340C 664E                <1> 	dec	si
  3157 0001340E 780F                <1> 	js	short scbs_1 ;  0 -> 0FFFFh  
  3158                              <1> 
  3159                              <1> 	; ESI = IRQ callback parameters index number (0 to 8)
  3160                              <1> 
  3161 00013410 08FF                <1> 	or	bh, bh
  3162 00013412 7419                <1> 	jz	short scbs_4 ; unlink the IRQ (in BL)
  3163                              <1> 
  3164 00013414 FECF                <1> 	dec	bh
  3165                              <1> 	; bh = method (0 = signal response byte, 1 = callback)
  3166                              <1> 	;	      (2 = auto increment of signal response byte) 
  3167                              <1> 
  3168 00013416 80BE[C2930100]00    <1> 	cmp	byte [esi+IRQ.owner], 0 ; locked ?
  3169 0001341D 7637                <1> 	jna	short scbs_6	; no... OK...	
  3170                              <1> 
  3171                              <1> scbs_1:
  3172                              <1> 	; permission denied (prohibited IRQ)
  3173 0001341F B80B000000          <1> 	mov	eax, ERR_PERM_DENIED
  3174 00013424 F9                  <1> 	stc
  3175 00013425 C3                  <1> 	retn
  3176                              <1> scbs_2:
  3177 00013426 F9                  <1> 	stc
  3178                              <1> scbs_3:
  3179 00013427 B817000000          <1> 	mov	eax, ERR_INV_PARAMETER
  3180 0001342C C3                  <1> 	retn
  3181                              <1> 
  3182                              <1> scbs_4: ; unlink the requested IRQ (if it belongs to current user)
  3183                              <1> 	; 10/06/2017
  3184                              <1> 	; 22/04/2017
  3185                              <1> 	; 14/04/2017
  3186                              <1> 	; If AL = 0 -> The caller is 'syscalbac'
  3187 0001342D 8AA6[C2930100]      <1> 	mov	ah, [esi+IRQ.owner]
  3188 00013433 3A25[B3030300]      <1> 	cmp	ah, [u.uno]
  3189 00013439 75E4                <1> 	jne	short scbs_1
  3190                              <1> 
  3191 0001343B FE0D[D6030300]      <1> 	dec	byte [u.irqc] ; decrease IRQ count (in use)
  3192                              <1> 
  3193                              <1> 	;sub	ah, ah
  3194                              <1> 	;mov	[esi+IRQ.owner], ah ; 0 ; free !!!
  3195                              <1> 	;and	byte [esi+IRQ.method], 80h
  3196                              <1> 	;mov	[esi+IRQ.srb], ah ; 0
  3197                              <1> 	;mov	[esi+IRQ.dev], ah ; 0
  3198                              <1> 	;mov	dword [esi+IRQ.addr], 0
  3199                              <1> 	;mov	dword [u.r0], 0
  3200                              <1> 
  3201                              <1> 	;mov	byte [esi+IRQ.owner], 0
  3202                              <1> 
  3203                              <1> 	; 22/04/2017
  3204 00013441 29C0                <1> 	sub	eax, eax
  3205 00013443 8886[C2930100]      <1> 	mov	[esi+IRQ.owner], al ; 0
  3206                              <1> 	; 10/06/2017
  3207 00013449 8686[D4930100]      <1> 	xchg	al, [esi+IRQ.method]
  3208 0001344F 2480                <1> 	and	al, 80h
  3209 00013451 745E                <1> 	jz	short scbs_12 
  3210                              <1> 	; Audio device must be disabled -later- ! ([IRQ.medhod] = 80h)
  3211                              <1> 
  3212                              <1> ;	cmp	byte [esi+IRQ.method], 80h ; device drv or kernel extension ?
  3213                              <1> ;	jb	short scbs_12 ; bh = 0 reset to default IRQ handler
  3214                              <1> ;
  3215                              <1> ;	and	al, al
  3216                              <1> ;	jz	short  scbs_5  ; the caller is 'syscalbac'
  3217                              <1> ;	; The caller is 'sysaudio' or ...
  3218 00013453 30C0                <1> 	xor	al, al
  3219                              <1> ;	mov	[esi+IRQ.method], al ; 0 ; reset kernel extension flag
  3220                              <1> ;scbs_5:
  3221                              <1> ;	sub	ah, ah
  3222                              <1> 	;mov	[u.r0], eax ; 0
  3223 00013455 C3                  <1> 	retn	
  3224                              <1> 
  3225                              <1> scbs_6:
  3226                              <1> 	; 14/04/2017
  3227 00013456 20C0                <1> 	and	al, al
  3228 00013458 7405                <1> 	jz	short scbs_7  ; the caller is 'syscalbac'
  3229                              <1> 	; AL = user number ([u.uno] or [audio.user] or ...)
  3230                              <1> 	; The caller is 'sysaudio' or ...
  3231                              <1> 	;	
  3232                              <1> 	; bh = method (0 = signal response byte, 1 = callback)
  3233                              <1> 	;	      (2 = auto increment of signal response byte) 
  3234                              <1> 
  3235 0001345A 80CF80              <1> 	or	bh, 80h		; Kernel extension flag !
  3236 0001345D EB0A                <1> 	jmp	short scbs_8
  3237                              <1> scbs_7:	
  3238 0001345F 8A86[D4930100]      <1> 	mov	al, [esi+IRQ.method] ; >= 80h = kernel is using this IRQ
  3239 00013465 2480                <1> 	and	al, 80h ; use only bit 7 (kernel function flag)
  3240 00013467 08C7                <1> 	or	bh, al		 ; method 
  3241                              <1> 				 ; 0 = signal response byte, 1 = callback
  3242                              <1> 				 ; 2 = auto increment of s.r.b.
  3243                              <1> scbs_8:
  3244 00013469 A0[B3030300]        <1> 	mov	al, [u.uno] ; user (process) number (1 to 16)
  3245 0001346E 8886[C2930100]      <1> 	mov	[esi+IRQ.owner], al ; lock the IRQ for user
  3246 00013474 88BE[D4930100]      <1> 	mov	[esi+IRQ.method], bh
  3247                              <1> 
  3248                              <1> ;	test	bh, 1
  3249                              <1> ;	jnz	short scbs_9 	 ; Callback method, CX will not be used 
  3250                              <1> ;			
  3251                              <1> ;	test	bh, 2		 ; use auto increment (counter) method
  3252                              <1> ;	jz	short scbs_10	 ; (count can be used for buffer switch)
  3253                              <1> ;scbs_9:
  3254                              <1> ;	xor	ecx, ecx ; 0
  3255                              <1> scbs_10:			      	
  3256                              <1> 	;mov	[esi+IRQ.method], bh
  3257 0001347A 888E[DD930100]      <1> 	mov	[esi+IRQ.srb], cl
  3258 00013480 C686[CB930100]00    <1> 	mov	byte [esi+IRQ.dev], 0 ; device number is always 0 
  3259                              <1> 				 ; for this system call
  3260                              <1> 	;test	bh, 1
  3261 00013487 80E701              <1> 	and	bh, 1 ; 17/04/2017
  3262 0001348A 7513                <1> 	jnz	short scbs_11	 ; callback method, use virtual address 
  3263                              <1> 
  3264 0001348C 53                  <1> 	push	ebx ; IRQ number (in BL)
  3265 0001348D 89D3                <1> 	mov	ebx, edx
  3266                              <1> 	; ebx = virtual address
  3267                              <1> 	; [u.pgdir] = page directory's physical address
  3268 0001348F FE05[62930100]      <1> 	inc	 byte [no_page_swap] ; 1 
  3269                              <1> 			; Do not add this page to swap queue
  3270                              <1> 			; and remove it from swap queue if it is
  3271                              <1> 			; on the queue.
  3272 00013495 E8442EFFFF          <1> 	call	get_physical_addr
  3273 0001349A 5B                  <1> 	pop	ebx
  3274 0001349B 728A                <1> 	jc	scbs_3 ; invalid address !
  3275                              <1> 	; eax = physical address of the virtual address in user's space
  3276 0001349D 89C2                <1> 	mov	edx, eax
  3277                              <1> scbs_11:
  3278 0001349F 66C1E602            <1> 	shl	si, 2		; byte (index) to dword (offset)
  3279 000134A3 8996[E6930100]      <1> 	mov	[esi+IRQ.addr], edx
  3280                              <1> 
  3281 000134A9 FE05[D6030300]      <1> 	inc	byte [u.irqc]	; increase IRQ (in use) count
  3282                              <1> 
  3283 000134AF FEC7                <1> 	inc	 bh ; 17/04/2017
  3284                              <1> 	; bh > 0 -> set to requested IRQ handler (IRQ_u_list)
  3285                              <1> scbs_12:
  3286 000134B1 88D8                <1> 	mov	al, bl ; IRQ number
  3287 000134B3 88FC                <1> 	mov	ah, bh ; 0 = reset, >0 = set
  3288 000134B5 E8CFF3FFFF          <1> 	call	set_hardware_int_vector
  3289                              <1> 
  3290 000134BA 31C0                <1> 	xor	eax, eax
  3291                              <1> 	;mov 	[u.r0], eax ; 0	
  3292                              <1> 
  3293 000134BC C3                  <1> 	retn	; return with success (cf=0, eax=0)
  3294                              <1> 
  3295                              <1> 
  3296                              <1> sysdma: ; DMA FUNCTIONS
  3297                              <1> 	; 02/09/2017
  3298                              <1> 	; 28/08/2017
  3299                              <1> 	; 20/08/2017 - TRDOS 386 (TRDOS v2.0)
  3300                              <1> 	;
  3301                              <1> 	; Inputs:
  3302                              <1> 	;	BH = 0 -> Allocate DMA buffer
  3303                              <1> 	;	   BL = 0 -> Use the system's default DMA
  3304                              <1> 	;		     (SB16) Buffer
  3305                              <1> 	;	        Buffer Size (max.) = 65536 bytes
  3306                              <1> 	;	   BL > 0 -> Allocate (a new) DMA buffer
  3307                              <1>  	;	   ECX = DMA Buffer Size in bytes (<=128KB)
  3308                              <1> 	;	   EDX = Virtual Address of DMA buffer 	
  3309                              <1> 	;		
  3310                              <1> 	;	BH = 1 -> Initialize (Start) DMA service
  3311                              <1> 	;	     BL, bit 0 to 3 = Channel Number (0 to 7)	
  3312                              <1> 	;	     BL, bit 7 = Auto Initialized Mode 
  3313                              <1> 	;			(If bit 7 is set)
  3314                              <1> 	;		 bit 6 = Record (read) mode (0= playback)
  3315                              <1> 	;	     ECX = byte count (0 = use dma buffer size)
  3316                              <1> 	;	     EDX = physical buffer address
  3317                              <1> 	;	     	   (0 = use dma buffer -start- address)		
  3318                              <1> 	;
  3319                              <1> 	;	BH = 2 -> Get Current DMA Buffer Offset
  3320                              <1> 	;	     BL = DMA channel number	
  3321                              <1> 	;		
  3322                              <1> 	;	BH = 3 -> Get Current DMA count down value
  3323                              <1> 	;	     BL = DMA channel number (0 tO 7)	
  3324                              <1> 	;
  3325                              <1> 	;	BH = 4 -> Get Current DMA channel (in progress)
  3326                              <1> 	;
  3327                              <1> 	;	BH = 5 -> Get System's Default DMA Buffer Address
  3328                              <1> 	;
  3329                              <1> 	;	BH = 6 -> Get Current DMA Buffer Address	
  3330                              <1> 	;
  3331                              <1> 	;	BH = 7 -> Stop DMA service
  3332                              <1> 	;
  3333                              <1> 	;
  3334                              <1> 	; Outputs:
  3335                              <1> 	;
  3336                              <1> 	;	For BH = 0 ; Allocate DMA buffer
  3337                              <1> 	;	    EAX = Physical address of DMA buffer
  3338                              <1> 	;	    ECX = Allocated buffer size in bytes
  3339                              <1> 	;		  - page count * 4096 -
  3340                              <1> 	;		  (may be bigger than requested)	
  3341                              <1> 	;	    If BL input > 0,
  3342                              <1> 	;	       'sysalloc:' system call will be used with
  3343                              <1>   	;	       EBX (for 'sysalloc') = EDX (for 'sysdma')
  3344                              <1> 	;	       ECX is same, byte count (buffer size)
  3345                              <1> 	;	       EDX = 1024*1024*16 ; 16 MB upper limit	 		        	 
  3346                              <1> 	;	    If BL input = 0,
  3347                              <1> 	;	       Default DMA buffer (SB16 buffer) will be
  3348                              <1> 	;	       checked and if it is free, it's address
  3349                              <1> 	;	       will be returned in EAX and it's size
  3350                              <1> 	;	       will be returned in ECX (as 65536)
  3351                              <1> 	;
  3352                              <1> 	;	    If CF = 1, error code is in EAX
  3353                              <1> 	;	       EAX = -1 ; DMA buffer allocation error! 		
  3354                              <1> 	;	       EAX = 11 ; 'Permission Denied' error !
  3355                              <1> 	;
  3356                              <1> 	;	       Note: 'sysalloc' error return method
  3357                              <1> 	;		      will be applied if BL input > 0 !		
  3358                              <1> 	;
  3359                              <1> 	; 	 For BH = 1 ; Initialize (Start) DMA
  3360                              <1> 	;	     EAX = 0 (Successful)	
  3361                              <1> 	;	     If CF = 1, error code is in EAX
  3362                              <1> 	;
  3363                              <1> 	; 	 For BH = 2 ; Get Current DMA Buffer Offset
  3364                              <1> 	;	     EAX = DMA Buffer Offset (in bytes)
  3365                              <1> 	;	     ;
  3366                              <1> 	;	      AX = DMA buffer offset
  3367                              <1> 	;	     EAX bits 16 to 23 = Page register value
  3368                              <1> 	;		   	
  3369                              <1> 	; 	 For BH = 3 ; Get Current DMA count down value
  3370                              <1> 	;	     EAX = Count down value (remain bytes)
  3371                              <1> 	;	
  3372                              <1> 	;	 For BH = 4 ; Get Current DMA channel (in progress)
  3373                              <1> 	;	     EAX = DMA channel number (0 to 7)
  3374                              <1> 	;		AH = 0 if the owner is the caller process
  3375                              <1> 	;		AH > 0 if the dma channel is in use by
  3376                              <1> 	;		       another user/process
  3377                              <1> 	;	     EAX = -1 (0FFFFFFFFh) 
  3378                              <1> 	;		    if DMA service is not in use	    		
  3379                              <1> 	;	 	    (stopped or not initialized/started)	
  3380                              <1> 	;
  3381                              <1> 	;	 For BH = 5 ; Get System's Default DMA Buff Addr
  3382                              <1> 	;	     EAX = Default DMA Buffer Address (Physical)
  3383                              <1> 	;		 = offset 'sb16_dma_buffer:'	
  3384                              <1> 	;	     ECX = Buffer size
  3385                              <1> 	;		 = 65536 
  3386                              <1> 	;
  3387                              <1> 	;	 For BH = 6 ; Get Current DMA Buffer Address
  3388                              <1> 	;	     EAX = Current DMA buffer address (Physical)
  3389                              <1> 	;	     ECX = Current DMA buffer size (setting value)	   		  	 		
  3390                              <1> 	;	     Note: These values are for current dma channel
  3391                              <1> 	;		   settings for the user/process
  3392                              <1> 	;	     ** For now (for current TRDOS 386 version)
  3393                              <1> 	;		only one user/process can use only one
  3394                              <1> 	;		dma channel & one dma buffer at same time
  3395                              <1> 	;		(no multi tasking on DMA service) !!! **
  3396                              <1> 	;	     (Once, current DMA user must stop it's own DMA
  3397                              <1> 	;	      DMA service, than another user/program 
  3398                              <1> 	;	      can use DMA service with same dma channel 
  3399                              <1> 	;	      or with another DMA channel.)	 			      		
  3400                              <1> 	;
  3401                              <1> 	;	 For BH = 7 ; Stop DMA service (for current user
  3402                              <1> 	;	     and current DMA channel)	
  3403                              <1> 	;	     EAX = 0 ; successful
  3404                              <1> 	;	     CF = 1 & EAX > 0 (= -1) -> Error		
  3405                              <1> 
  3406 000134BD 80FF07              <1> 	cmp	bh, 7
  3407 000134C0 7612                <1> 	jna	short sysdma_0
  3408                              <1> 
  3409                              <1> sysdma_err:
  3410 000134C2 31C0                <1> 	xor	eax, eax
  3411 000134C4 48                  <1> 	dec	eax ; -1
  3412                              <1> sysdma_perm_err:
  3413 000134C5 A3[64030300]        <1> 	mov	[u.r0], eax
  3414 000134CA A3[C8030300]        <1> 	mov	[u.error], eax ; DMA service error !
  3415 000134CF E9F8A3FFFF          <1> 	jmp	error
  3416                              <1> 
  3417                              <1> sysdma_0:
  3418 000134D4 08FF                <1> 	or	bh, bh
  3419 000134D6 0F85BA000000        <1> 	jnz	sysdma_1
  3420                              <1> 	
  3421 000134DC 20DB                <1> 	and	bl, bl
  3422 000134DE 7416                <1> 	jz	short sysdma_01
  3423                              <1> 
  3424                              <1> 	; redirect system call to 'sysalloc'
  3425 000134E0 89D3                <1> 	mov	ebx, edx ; virtual address of DMA buffer
  3426                              <1> 	;ecx = Buffer size in bytes
  3427                              <1> 	; DMA buffer address <= 16MB upper limit
  3428 000134E2 BA00000001          <1> 	mov	edx, 1024*1024*16 ; 16MB limit for DMA buff
  3429                              <1> 
  3430 000134E7 C705[54980100]FFFF- <1> 	mov	dword [dma_addr], 0FFFFFFFFh ; -1
  3430 000134EF FFFF                <1>
  3431                              <1> 
  3432 000134F1 E9A3E5FFFF          <1> 	jmp	sysalloc
  3433                              <1> 
  3434                              <1> sysdma_01:
  3435 000134F6 B8[00000200]        <1> 	mov	eax, sb16_dma_buffer
  3436                              <1> 
  3437 000134FB 803D[11940100]01    <1> 	cmp	byte [audio_device], 1
  3438 00013502 722A                <1> 	jb	short sysdma_03
  3439                              <1> 
  3440 00013504 3B05[30940100]      <1> 	cmp	eax, [audio_dma_buff]
  3441 0001350A 7507                <1> 	jne	short sysdma_02
  3442                              <1> 
  3443                              <1> sysdma_0_err:
  3444 0001350C B80B000000          <1> 	mov	eax, ERR_PERM_DENIED
  3445 00013511 EBB2                <1> 	jmp	short sysdma_perm_err
  3446                              <1> 
  3447                              <1> sysdma_02:
  3448                              <1> 	; Only one user is permitted for audio/dma functions
  3449                              <1> 
  3450 00013513 833D[30940100]00    <1> 	cmp	dword [audio_dma_buff], 0
  3451 0001351A 7612                <1> 	jna	short sysdma_03
  3452                              <1> 
  3453 0001351C 8A1D[39940100]      <1> 	mov	bl, [audio_user]
  3454 00013522 08DB                <1> 	or	bl, bl
  3455 00013524 7408                <1> 	jz	short sysdma_03
  3456                              <1> 
  3457 00013526 3A1D[B3030300]      <1> 	cmp	bl, [u.uno]
  3458 0001352C 75DE                <1> 	jne	short sysdma_0_err
  3459                              <1> 
  3460                              <1> sysdma_03: 
  3461 0001352E 8A1D[51980100]      <1> 	mov	bl, [dma_user]
  3462 00013534 20DB                <1> 	and	bl, bl
  3463 00013536 750E                <1> 	jnz	short sysdma_04
  3464                              <1> 	
  3465 00013538 8A1D[B3030300]      <1> 	mov	bl, [u.uno]
  3466 0001353E 881D[51980100]      <1> 	mov	[dma_user], bl
  3467                              <1> 
  3468 00013544 EB15                <1> 	jmp	short sysdma_05
  3469                              <1> 
  3470                              <1> sysdma_04:
  3471 00013546 8B35[54980100]      <1> 	mov	esi, [dma_addr]
  3472 0001354C 21F6                <1> 	and	esi, esi
  3473 0001354E 740B                <1> 	jz	short sysdma_05
  3474                              <1> 
  3475 00013550 46                  <1> 	inc	esi ; -1 -> 0
  3476 00013551 7408                <1> 	jz	short sysdma_05
  3477                              <1> 
  3478 00013553 3A1D[B3030300]      <1> 	cmp	bl, [u.uno]
  3479 00013559 75B1                <1> 	jne	short sysdma_0_err
  3480                              <1> 	
  3481                              <1> sysdma_05:
  3482                              <1> 	; edx = virtual address (user's buffer address)
  3483                              <1> 	; 
  3484 0001355B 81F900000100        <1> 	cmp	ecx, 65536   ; byte count (buffer size)
  3485 00013561 0F875BFFFFFF        <1> 	ja	sysdma_err	
  3486                              <1> 	;
  3487 00013567 81C1FF0F0000        <1> 	add	ecx, PAGE_SIZE-1 ; 4095
  3488 0001356D 6681E100F0          <1> 	and	cx, ~PAGE_OFF ; not 4095
  3489                              <1> 	;cmp	ecx, 65536
  3490                              <1> 	;ja	sysdma_err ;
  3491 00013572 51                  <1> 	push	ecx	; buffer size (allocated pages * 4096) 
  3492 00013573 50                  <1> 	push	eax	; offset sb16_dma_buffer
  3493 00013574 89D3                <1> 	mov	ebx, edx
  3494 00013576 C1E90C              <1> 	shr	ecx, 12 ; byte count to page count
  3495                              <1> 	; eax = physical address of (audio) dma buffer
  3496                              <1> 	; ebx = virtual address of (audio) dma buffer (user's pgdir) 
  3497                              <1> 	; ecx = page count (>0)
  3498 00013579 E87231FFFF          <1> 	call	direct_memory_access
  3499 0001357E 58                  <1> 	pop	eax
  3500 0001357F 59                  <1> 	pop	ecx
  3501 00013580 0F823CFFFFFF        <1> 	jc	sysdma_err
  3502                              <1> 
  3503 00013586 A3[54980100]        <1> 	mov	[dma_addr], eax
  3504 0001358B 890D[58980100]      <1> 	mov	[dma_size], ecx ; dma buffer size (in bytes)
  3505                              <1> 
  3506                              <1> 	;mov	[u.r0], eax ; DMA Buffer Address (Physical)
  3507                              <1> 
  3508                              <1> 	;mov	ebp, [u.usp]  ; ebp points to user's registers
  3509                              <1> 	;mov	[ebp+24], ecx ; return to user with ecx value
  3510                              <1> 
  3511                              <1> 	;jmp	sysret
  3512                              <1> 
  3513                              <1> 	; 28/08/2017
  3514 00013591 E9C4000000          <1> 	jmp	sysdma_51
  3515                              <1> 
  3516                              <1> sysdma_1:
  3517 00013596 80FF01              <1> 	cmp	bh, 1
  3518 00013599 0F87A6000000        <1> 	ja	sysdma_5
  3519                              <1> 
  3520 0001359F F6C340              <1> 	test	bl, 40h	; record (read) mode -BL, bit 6-
  3521 000135A2 0F851AFFFFFF        <1> 	jnz	sysdma_err ; not ready yet!
  3522                              <1> 
  3523 000135A8 A1[54980100]        <1> 	mov	eax, [dma_addr] ; physical address of dma buffer
  3524 000135AD 21C0                <1> 	and	eax, eax
  3525 000135AF 0F840DFFFFFF        <1> 	jz	sysdma_err
  3526                              <1> 
  3527 000135B5 09D2                <1> 	or	edx, edx
  3528 000135B7 7504                <1> 	jnz	short sysdma_11
  3529                              <1> 
  3530 000135B9 89C2                <1> 	mov	edx, eax
  3531 000135BB EB08                <1> 	jmp	short sysdma_12	
  3532                              <1> sysdma_11:
  3533 000135BD 39C2                <1> 	cmp	edx, eax
  3534 000135BF 0F82FDFEFFFF        <1> 	jb	sysdma_err
  3535                              <1> sysdma_12:
  3536 000135C5 21C9                <1> 	and	ecx, ecx
  3537 000135C7 7508                <1> 	jnz	short sysdma_13
  3538                              <1> 
  3539 000135C9 8B0D[58980100]      <1> 	mov	ecx, [dma_size]
  3540 000135CF EB0C                <1> 	jmp	short sysdma_14
  3541                              <1> sysdma_13:
  3542 000135D1 3B0D[58980100]      <1> 	cmp	ecx, [dma_size]
  3543 000135D7 0F87E5FEFFFF        <1> 	ja	sysdma_err
  3544                              <1> sysdma_14:
  3545 000135DD 89C6                <1> 	mov	esi, eax
  3546 000135DF 0335[58980100]      <1> 	add	esi, [dma_size]
  3547                              <1> 
  3548 000135E5 89D0                <1> 	mov	eax, edx
  3549 000135E7 01C8                <1> 	add	eax, ecx
  3550 000135E9 0F82D3FEFFFF        <1> 	jc	sysdma_err ; 02/09/2017	
  3551                              <1> 		
  3552 000135EF 39F0                <1> 	cmp	eax, esi
  3553 000135F1 0F87CBFEFFFF        <1> 	ja	sysdma_err
  3554                              <1> 
  3555 000135F7 8B3D[30940100]      <1> 	mov	edi, [audio_dma_buff]
  3556 000135FD 8B35[54980100]      <1> 	mov	esi, [dma_addr]
  3557                              <1> 
  3558 00013603 09FF                <1> 	or	edi, edi
  3559 00013605 7424                <1> 	jz	short sysdma_16
  3560                              <1> 	
  3561 00013607 803D[11940100]01    <1> 	cmp	byte [audio_device], 1
  3562 0001360E 7208                <1> 	jb	short sysdma_15
  3563                              <1> 
  3564                              <1> 	; Sound Blaster 16
  3565 00013610 39FE                <1> 	cmp	esi, edi
  3566 00013612 0F84F4FEFFFF        <1> 	je	sysdma_0_err ; permmission denied !
  3567                              <1> 
  3568                              <1> sysdma_15:
  3569 00013618 C605[53980100]48    <1> 	mov	byte [dma_mode], 48h ; single mode playback	
  3570                              <1> 
  3571 0001361F F6C380              <1> 	test	bl, 80h ; DMA mode - BL, bit 7, auto init -
  3572 00013622 7407                <1> 	jz	short sysdma_16	
  3573                              <1> 	; Auto initialized playback (write) mode
  3574 00013624 8005[53980100]10    <1> 	add	byte [dma_mode], 10h ; = 58h
  3575                              <1> sysdma_16:
  3576 0001362B 80E307              <1> 	and	bl, 07h
  3577 0001362E 881D[52980100]      <1> 	mov	[dma_channel], bl
  3578 00013634 8915[5C980100]      <1> 	mov	[dma_start], edx
  3579 0001363A 890D[60980100]      <1> 	mov	[dma_count], ecx
  3580                              <1> 	 
  3581                              <1> 	; 28/08/2017
  3582                              <1> 	;call	dma_init
  3583                              <1> 	;jmp	sysret
  3584 00013640 E94B010000          <1> 	jmp	dma_init
  3585                              <1> 
  3586                              <1> sysdma_5:
  3587 00013645 80FF05              <1> 	cmp	bh, 5
  3588 00013648 7223                <1> 	jb	short sysdma_3
  3589 0001364A 0F87CE000000        <1> 	ja	sysdma_6	
  3590                              <1> 
  3591                              <1> 	; Get the system's default dma buffer addr and size
  3592 00013650 B8[00000200]        <1> 	mov	eax, sb16_dma_buffer
  3593 00013655 B900000100          <1> 	mov	ecx, 65536 ; Buffer size in bytes
  3594                              <1> 
  3595                              <1> sysdma_51:
  3596                              <1> 	; 0 = there is not a dma buffer (in use or available)
  3597 0001365A A3[64030300]        <1> 	mov	[u.r0], eax
  3598                              <1> 
  3599 0001365F 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  3600 00013665 894D18              <1> 	mov	[ebp+24], ecx ; return to user with ecx value
  3601                              <1> 
  3602 00013668 E97FA2FFFF          <1> 	jmp	sysret
  3603                              <1> 
  3604                              <1> sysdma_3:
  3605 0001366D 80FF03              <1> 	cmp	bh, 3
  3606 00013670 7231                <1> 	jb	short sysdma_2
  3607 00013672 776B                <1> 	ja	short sysdma_4
  3608                              <1> 
  3609                              <1> 	; Get current dma count down value (remain bytes)
  3610                              <1> 	; 28/08/2017
  3611 00013674 0FB635[52980100]    <1> 	movzx	esi, byte [dma_channel]
  3612 0001367B 0FB696[90410100]    <1> 	movzx	edx, byte [dma_flip+esi]
  3613 00013682 EE                  <1> 	out	dx, al			; flip-flop clear
  3614 00013683 8A96[70410100]      <1> 	mov	dl, [dma_cnt+esi] ; dma count register addr
  3615 00013689 EC                  <1> 	in	al, dx
  3616 0001368A 0FB6D8              <1> 	movzx	ebx, al	
  3617 0001368D EC                  <1> 	in	al, dx
  3618 0001368E 88C7                <1> 	mov     bh, al
  3619                              <1> 	
  3620 00013690 6683FE04            <1> 	cmp	si, 4 ; channel number ?
  3621 00013694 7202                <1> 	jb	short sysdma_31 ; 8 bit dma channel
  3622                              <1> 
  3623 00013696 D1E3                <1> 	shl	ebx, 1	; word count to byte count
  3624                              <1> 
  3625                              <1> sysdma_31:
  3626 00013698 891D[64030300]      <1> 	mov	[u.r0], ebx
  3627                              <1> 
  3628 0001369E E949A2FFFF          <1> 	jmp	sysret	
  3629                              <1> 
  3630                              <1> sysdma_2:
  3631                              <1> 	; Get current dma buffer offset (& page)
  3632                              <1> 	; 28/08/2017
  3633 000136A3 0FB635[52980100]    <1> 	movzx	esi, byte [dma_channel]
  3634 000136AA 0FB696[90410100]    <1> 	movzx	edx, byte [dma_flip+esi]
  3635 000136B1 EE                  <1> 	out	dx, al			; flip-flop clear
  3636 000136B2 8A96[68410100]      <1> 	mov	dl, [dma_adr+esi]
  3637 000136B8 EC                  <1> 	in	al, dx			; get dma position
  3638 000136B9 0FB6D8              <1> 	movzx	ebx, al
  3639 000136BC EC                  <1> 	in	al, dx			
  3640 000136BD 88C7                <1> 	mov	bh, al
  3641                              <1> 
  3642 000136BF 6683FE04            <1> 	cmp	si, 4 ; channel number ?
  3643 000136C3 7202                <1> 	jb	short sysdma_21 ; 8 bit dma channel
  3644                              <1> 
  3645 000136C5 D1E3                <1> 	shl	ebx, 1	; word offset to byte offset
  3646                              <1> 
  3647                              <1> sysdma_21:
  3648 000136C7 891D[64030300]      <1> 	mov	[u.r0], ebx
  3649                              <1> 
  3650 000136CD 8A96[78410100]      <1> 	mov	dl, [dma_page+esi]
  3651 000136D3 EC                  <1> 	in	al, dx			; get dma page
  3652                              <1> 
  3653                              <1> 	;add	[u.ro+2], al
  3654 000136D4 0805[66030300]      <1> 	or	[u.r0+2], al
  3655                              <1> 
  3656 000136DA E90DA2FFFF          <1> 	jmp	sysret
  3657                              <1> 
  3658                              <1> sysdma_4:
  3659                              <1> 	; Get current DMA channel number
  3660                              <1> 	; 28/08/2017
  3661 000136DF 8A25[51980100]      <1> 	mov	ah, [dma_user]
  3662 000136E5 20E4                <1> 	and	ah, ah
  3663 000136E7 750F                <1> 	jnz	short sysdma_42
  3664                              <1> 
  3665                              <1> sysdma_41:	
  3666                              <1> 	; Not a valid dma channel (in use)
  3667 000136E9 C705[64030300]FFFF- <1> 	mov	dword [u.r0], -1 ; 0FFFFFFFFh
  3667 000136F1 FFFF                <1>
  3668 000136F3 E9F4A1FFFF          <1> 	jmp	sysret
  3669                              <1> 
  3670                              <1> sysdma_42:
  3671 000136F8 8B35[54980100]      <1> 	mov	esi, [dma_addr]
  3672 000136FE 21F6                <1> 	and	esi, esi
  3673 00013700 74E7                <1> 	jz	short sysdma_41
  3674                              <1> 
  3675 00013702 46                  <1> 	inc	esi ; -1 -> 0
  3676 00013703 74E4                <1> 	jz	short sysdma_41
  3677                              <1> 
  3678 00013705 A0[52980100]        <1> 	mov	al, [dma_channel]
  3679                              <1> 
  3680 0001370A 3A25[B3030300]      <1> 	cmp	ah, [u.uno]
  3681 00013710 7502                <1> 	jne	short sysdma_43
  3682                              <1> 
  3683 00013712 30E4                <1> 	xor	ah, ah ; DMA channel in use by current user
  3684                              <1> 
  3685                              <1> sysdma_43:
  3686 00013714 A3[64030300]        <1> 	mov	[u.r0], eax ; AL = dma channel number
  3687                              <1> 			    ; AH > 0 if the the channel
  3688                              <1> 			    ; in use by another user/process
  3689 00013719 E9CEA1FFFF          <1> 	jmp	sysret
  3690                              <1> 
  3691                              <1> sysdma_6:
  3692 0001371E 80FF06              <1> 	cmp	bh, 6
  3693 00013721 7710                <1> 	ja	short sysdma_7
  3694                              <1> 
  3695                              <1> 	; 28/08/2017
  3696                              <1> 	; Get current DMA buffer addr and size
  3697 00013723 A1[54980100]        <1> 	mov	eax, [dma_addr] ; dma buffer address
  3698 00013728 8B0D[58980100]      <1> 	mov	ecx, [dma_size] ; dma buffer size (in bytes)
  3699                              <1> 
  3700 0001372E E927FFFFFF          <1> 	jmp	sysdma_51
  3701                              <1> 
  3702                              <1> sysdma_7:
  3703                              <1> 	; DMA service STOP
  3704 00013733 A0[B3030300]        <1> 	mov	al, [u.uno]
  3705 00013738 3A05[51980100]      <1> 	cmp	al, [dma_user]
  3706 0001373E 751D                <1> 	jne	short sysdma_72
  3707                              <1> 	
  3708 00013740 28C0                <1> 	sub	al, al ; 0
  3709                              <1> 
  3710 00013742 A2[51980100]        <1> 	mov	[dma_user], al ; clear user
  3711                              <1> 
  3712 00013747 8605[53980100]      <1> 	xchg	al, [dma_mode]
  3713 0001374D 20C0                <1> 	and	al, al
  3714                              <1> 	;jz	short sysdma_err
  3715 0001374F 7527                <1> 	jnz	short sysdma_73	
  3716                              <1> 
  3717                              <1> sysdma_71:
  3718 00013751 31C0                <1> 	xor	eax, eax
  3719 00013753 A3[64030300]        <1> 	mov	[u.r0], eax; 0
  3720 00013758 E98FA1FFFF          <1> 	jmp	sysret
  3721                              <1> 
  3722                              <1> sysdma_72:
  3723                              <1> 	; 28/08/2017
  3724 0001375D 803D[51980100]00    <1> 	cmp	byte [dma_user], 0
  3725 00013764 76EB                <1> 	jna	short sysdma_71 ; Nothing to do !
  3726                              <1> 
  3727 00013766 833D[54980100]00    <1> 	cmp	dword [dma_addr], 0
  3728 0001376D 0F8799FDFFFF        <1> 	ja	sysdma_0_err
  3729                              <1> 	
  3730 00013773 A2[51980100]        <1> 	mov	[dma_user], al ; reset to current user
  3731                              <1> 
  3732                              <1> sysdma_73:
  3733                              <1> 	; 28/08/2017
  3734 00013778 0FB635[52980100]    <1> 	movzx	esi, byte [dma_channel]
  3735 0001377F 0FB696[80410100]    <1> 	movzx	edx, byte [dma_mask+esi]
  3736 00013786 A0[52980100]        <1> 	mov	al, [dma_channel]
  3737 0001378B 0C04                <1> 	or	al, 4
  3738 0001378D EE                  <1> 	out	dx, al
  3739                              <1> 
  3740 0001378E EBC1                <1> 	jmp	short sysdma_71
  3741                              <1> 
  3742                              <1> dma_init:
  3743                              <1> 	; 28/08/2017
  3744                              <1> 	; 20/08/2017
  3745                              <1> 	; DMA initialization
  3746                              <1> 	; 14/08/2017
  3747                              <1> 	; 03/08/2017, 06/08/2017, 08/08/2017
  3748                              <1> 	; 02/07/2017, 13/07/2017, 16/07/2017, 30/07/2017
  3749                              <1> 	; (Derived from 'DMA_INIT' procedure in SB16MOD.ASM)
  3750                              <1> 	; Modified for TRDOS 386 DMA buffer allocation & initialization !
  3751                              <1> 
  3752 00013790 8B1D[5C980100]      <1> 	mov	ebx, [dma_start]
  3753 00013796 8B0D[60980100]      <1> 	mov	ecx, [dma_count]
  3754                              <1> 
  3755 0001379C 0FB635[52980100]    <1> 	movzx	esi, byte [dma_channel]
  3756                              <1> 
  3757 000137A3 6683FE04            <1> 	cmp	si, 4
  3758 000137A7 7205                <1> 	jb	short gdmi1
  3759                              <1> 	; 08/08/2017
  3760 000137A9 66D1E9              <1> 	shr	cx, 1 ; word count
  3761 000137AC D1EB                <1> 	shr	ebx, 1 ; convert byte offset to word offset
  3762                              <1> gdmi1:
  3763                              <1> 	;mov	[dma_poff], bx ; 08/08/2017
  3764 000137AE 6649                <1> 	dec	cx			; dma size = block size - 1
  3765                              <1> 	
  3766 000137B0 0FB696[80410100]    <1> 	movzx	edx, byte [dma_mask+esi] ; 30/07/2017
  3767 000137B7 A0[52980100]        <1> 	mov	al, [dma_channel]
  3768 000137BC 0C04                <1> 	or	al, 4
  3769 000137BE EE                  <1> 	out	dx, al			; dma channel mask
  3770                              <1> 
  3771 000137BF 30C0                <1> 	xor	al, al ; 0 ; any value ! 08/08/2017
  3772 000137C1 8A96[90410100]      <1> 	mov	dl, [dma_flip+esi]
  3773 000137C7 EE                  <1> 	out	dx, al			; flip-flop clear
  3774                              <1> 	
  3775 000137C8 8A96[88410100]      <1> 	mov	dl, [dma_mod+esi]
  3776 000137CE A0[52980100]        <1> 	mov	al, [dma_channel]  ; 13/07/2017
  3777 000137D3 2403                <1> 	and	al, 3
  3778                              <1> 	; 08/08/2017
  3779 000137D5 0A05[53980100]      <1> 	or	al, [dma_mode] ; 58h    ; dma mode for SB16
  3780 000137DB EE                  <1> 	out	dx, al			
  3781                              <1> 
  3782 000137DC 8A96[68410100]      <1> 	mov	dl, [dma_adr+esi]	
  3783 000137E2 88D8                <1> 	mov	al, bl			
  3784 000137E4 EE                  <1> 	out	dx, al			; offset low
  3785                              <1> 
  3786 000137E5 88F8                <1> 	mov	al, bh
  3787 000137E7 EE                  <1> 	out	dx, al			; offset high
  3788                              <1> 
  3789 000137E8 8A96[70410100]      <1> 	mov	dl, [dma_cnt+esi]
  3790 000137EE 88C8                <1> 	mov	al, cl
  3791 000137F0 EE                  <1> 	out	dx, al			; size low
  3792                              <1> 
  3793 000137F1 88E8                <1> 	mov	al, ch
  3794 000137F3 EE                  <1> 	out	dx, al			; size high
  3795                              <1> 
  3796 000137F4 8A96[78410100]      <1> 	mov	dl, [dma_page+esi]
  3797                              <1> 	; 14/08/2017 
  3798 000137FA 6683FE04            <1> 	cmp	si, 4
  3799 000137FE 7305                <1> 	jnb	short gdmi2
  3800 00013800 C1EB10              <1> 	shr	ebx, 16
  3801 00013803 EB06                <1> 	jmp	short gdmi3
  3802                              <1> gdmi2:
  3803                              <1> 	; 09/08/2017
  3804 00013805 C1EB0F              <1> 	shr	ebx, 15	 ; complete 16 bit shift
  3805 00013808 80E3FE              <1> 	and	bl, 0FEh ; clear bit 0 (not necessary)
  3806                              <1> gdmi3:	
  3807 0001380B 88D8                <1> 	mov	al, bl
  3808 0001380D EE                  <1> 	out	dx, al			; page			
  3809                              <1> 	
  3810 0001380E 8A96[80410100]      <1> 	mov	dl, [dma_mask+esi]
  3811 00013814 A0[52980100]        <1> 	mov	al, [dma_channel]  ; 13/07/2017
  3812 00013819 2403                <1> 	and	al, 3
  3813 0001381B EE                  <1> 	out	dx, al			; dma channel unmask
  3814                              <1> 
  3815                              <1> 	;retn
  3816                              <1> 	; 28/08/2017
  3817 0001381C E9CBA0FFFF          <1> 	jmp	sysret
  3818                              <1> 
  3819                              <1> otty:
  3820                              <1> sret:
  3821                              <1> ocvt:
  3822                              <1> ctty:
  3823                              <1> cret:
  3824                              <1> ccvt:
  3825                              <1> rtty:
  3826                              <1> wtty:
  3827                              <1> rmem:
  3828                              <1> wmem:
  3829                              <1> rfd:
  3830                              <1> rhd:
  3831                              <1> wfd:
  3832                              <1> whd:
  3833                              <1> rlpt:
  3834                              <1> wlpt:
  3835                              <1> rcvt:
  3836                              <1> xmtt:
  3837 00013821 C3                  <1> 	retn
  3087                                  %include 'trdosk9.s' ; 04/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.3) - INITIALIZED DATA : trdosk9.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 24/01/2021
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 04/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; ----------------------------------------------------------------------------
     9                              <1> ; Assembler: NASM version 2.15 (trdos386.s)
    10                              <1> ; ----------------------------------------------------------------------------
    11                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    12                              <1> ; TRDOS2.ASM (09/11/2011)
    13                              <1> ; ****************************************************************************
    14                              <1> ; DRV_INIT.ASM [26/09/2009] Last Update: 07/08/2011
    15                              <1> ; MAINPROG.ASM [17/01/2004] Last Update: 09/11/2011
    16                              <1> ; CMD_INTR.ASM [29/01/2005] Last Update: 09/11/2011
    17                              <1> ; FILE.ASM [29/10/2009] Last Update: 09/10/2011
    18                              <1> 
    19                              <1> ; 12/02/2016
    20                              <1> Last_DOS_DiskNo: 
    21 00013822 01                  <1> 		db 1 ; A: = 0 & B: = 1
    22                              <1> 
    23                              <1> Restore_CDIR:	
    24 00013823 FF                  <1> 		db 0FFh ; Initial value -> any number except 0
    25                              <1> 
    26                              <1> msg_CRLF_temp:  
    27 00013824 070D0A00            <1> 		db 07h, 0Dh, 0Ah, 0
    28                              <1> 
    29                              <1> Magic_Bytes:
    30 00013828 04                  <1> 		db 4
    31 00013829 01                  <1> 		db 1
    32                              <1> mainprog_Version:
    33 0001382A 07                  <1> 		db 7
    34 0001382B 5B5452444F535D204D- <1> 		db "[TRDOS] Main Program v2.0.240121"
    34 00013834 61696E2050726F6772- <1>
    34 0001383D 616D2076322E302E32- <1>
    34 00013846 3430313231          <1>
    35 0001384B 0D0A                <1> 		db 0Dh, 0Ah
    36 0001384D 286329204572646F67- <1> 		db "(c) Erdogan Tan 2005-2021"
    36 00013856 616E2054616E203230- <1>
    36 0001385F 30352D32303231      <1>
    37 00013866 0D0A00              <1> 		db 0Dh, 0Ah, 0
    38                              <1> 
    39                              <1> MainProgCfgFile: ; 14/04/2016
    40 00013869 4D41494E50524F472E- <1> 		db "MAINPROG.CFG", 0
    40 00013872 43464700            <1>
    41                              <1> 
    42                              <1> TRDOSPromptLabel:
    43 00013876 5452444F53          <1> 		db "TRDOS"
    44 0001387B 00                  <1> 		db 0
    45 0001387C 00<rept>            <1>                 times 5 db 0
    46 00013881 00                  <1> 		db 0
    47                              <1> 
    48                              <1> ; INTERNAL COMMANDS
    49                              <1> Command_List:
    50 00013882 44495200            <1> Cmd_Dir:	db "DIR", 0
    51 00013886 434400              <1> Cmd_Cd:		db "CD", 0
    52 00013889 433A00              <1> Cmd_Drive:	db "C:", 0
    53 0001388C 56455200            <1> Cmd_Ver:	db "VER", 0
    54 00013890 4558495400          <1> Cmd_Exit:	db "EXIT", 0
    55 00013895 50524F4D505400      <1> Cmd_Prompt:	db "PROMPT", 0
    56 0001389C 564F4C554D4500      <1> Cmd_Volume:	db "VOLUME", 0
    57 000138A3 4C4F4E474E414D4500  <1> Cmd_LongName:	db "LONGNAME", 0
    58 000138AC 4441544500          <1> Cmd_Date:	db "DATE", 0
    59 000138B1 54494D4500          <1> Cmd_Time:	db "TIME", 0
    60 000138B6 52554E00            <1> Cmd_Run:	db "RUN", 0
    61 000138BA 53455400            <1> Cmd_Set:	db "SET", 0 
    62 000138BE 434C5300            <1> Cmd_Cls:	db "CLS", 0
    63 000138C2 53484F5700          <1> Cmd_Show:	db "SHOW", 0
    64 000138C7 44454C00            <1> Cmd_Del:	db "DEL", 0
    65 000138CB 41545452494200      <1> Cmd_Attrib:	db "ATTRIB", 0
    66 000138D2 52454E414D4500      <1> Cmd_Rename:	db "RENAME", 0
    67 000138D9 524D44495200        <1> Cmd_Rmdir:	db "RMDIR", 0
    68 000138DF 4D4B44495200        <1> Cmd_Mkdir:	db "MKDIR", 0
    69 000138E5 434F505900          <1> Cmd_Copy:	db "COPY", 0
    70 000138EA 4D4F564500          <1> Cmd_Move:	db "MOVE", 0
    71 000138EF 5041544800          <1> Cmd_Path:	db "PATH", 0
    72 000138F4 4D454D00            <1> Cmd_Mem:	db "MEM", 0
    73 000138F8 00                  <1> 		db 0
    74 000138F9 46494E4400          <1> Cmd_Find:	db "FIND", 0
    75 000138FE 4543484F00          <1> Cmd_Echo:	db "ECHO", 0
    76 00013903 2A00                <1> Cmd_Remark:	db "*", 0
    77 00013905 3F00                <1> Cmd_Help:	db "?", 0
    78 00013907 44455649434500      <1> Cmd_Device:	db "DEVICE", 0
    79 0001390E 4445564C49535400    <1> Cmd_DevList:	db "DEVLIST", 0
    80 00013916 434844495200        <1> Cmd_Chdir:	db "CHDIR", 0
    81 0001391C 4245455000          <1> Cmd_Beep:	db "BEEP", 0
    82                              <1> 		
    83 00013921 00                  <1> 		db 0
    84                              <1> 
    85                              <1> ; 15/02/2016 (FILE.ASM, 09/10/2011)
    86                              <1> invalid_fname_chars:
    87 00013922 222728292A2B2C2F    <1> 		db 22h, 27h, 28h, 29h, 2Ah, 2Bh, 2Ch, 2Fh
    88 0001392A 3A3B3C3D3E3F40      <1> 		db 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh, 40h
    89 00013931 5B5C5D5E60          <1> 		db 5Bh, 5Ch, 5Dh, 5Eh, 60h
    90                              <1> sizeInvFnChars  equ ($ - invalid_fname_chars)                
    91                              <1> ;
    92                              <1> 
    93                              <1> Msg_Enter_Date:
    94 00013936 456E746572206E6577- <1>                 db 'Enter new date (dd-mm-yy): '
    94 0001393F 206461746520286464- <1>
    94 00013948 2D6D6D2D7979293A20  <1>
    95 00013951 00                  <1>                 db 0
    96                              <1> Msg_Show_Date:
    97 00013952 43757272656E742064- <1>                 db   'Current date is '
    97 0001395B 61746520697320      <1>
    98 00013962 30                  <1> Day:            db   '0'
    99 00013963 30                  <1> 		db   '0'
   100 00013964 2F                  <1>                 db   '/'
   101 00013965 30                  <1> Month:          db   '0'
   102 00013966 30                  <1> 		db   '0'
   103 00013967 2F                  <1>                 db   '/'
   104 00013968 30                  <1> Century:        db   '0'
   105 00013969 30                  <1>                 db   '0'
   106 0001396A 30                  <1> Year:           db   '0'
   107 0001396B 30                  <1> 		db   '0'
   108 0001396C 0D0A00              <1>                 db   0Dh, 0Ah, 0
   109                              <1> 
   110                              <1> Msg_Enter_Time:
   111 0001396F 456E746572206E6577- <1> 		db 'Enter new time: '
   111 00013978 2074696D653A20      <1>
   112 0001397F 00                  <1> 		db 0
   113                              <1> Msg_Show_Time:
   114 00013980 43757272656E742074- <1> 		db   'Current time is '
   114 00013989 696D6520697320      <1>
   115 00013990 30                  <1> Hour:           db   '0'
   116 00013991 30                  <1> 		db   '0'
   117 00013992 3A                  <1> 		db   ':'
   118 00013993 30                  <1> Minute:         db   '0'
   119 00013994 30                  <1> 		db   '0'
   120 00013995 3A                  <1> 		db   ':'
   121 00013996 30                  <1> Second:         db   '0'
   122 00013997 30                  <1> 		db   '0'
   123 00013998 0D0A00              <1> 		db   0Dh, 0Ah, 0
   124                              <1> 
   125                              <1> ;VolSize_Unit1:   dd 0
   126                              <1> ;VolSize_Unit2:   dd 0
   127                              <1> 
   128                              <1> VolSize_KiloBytes:
   129 0001399B 206B696C6F62797465- <1> 		db " kilobytes", 0Dh, 0Ah, 0
   129 000139A4 730D0A00            <1>
   130                              <1> VolSize_Bytes:
   131 000139A8 2062797465730D0A00  <1> 		db " bytes", 0Dh, 0Ah, 0
   132                              <1> Volume_in_drive:
   133 000139B1 0D0A                <1> 		db 0Dh, 0Ah
   134                              <1> Vol_FS_Name:
   135 000139B3 54522046533120      <1> 		db "TR FS1 "
   136 000139BA 566F6C756D6520696E- <1> 		db "Volume in drive "
   136 000139C3 20647269766520      <1>
   137 000139CA 30                  <1> Vol_Drv_Name:   db 30h
   138 000139CB 3A                  <1> 		db ":"
   139 000139CC 20697320            <1> 		db " is "
   140 000139D0 0D0A00              <1> 		db 0Dh, 0Ah, 0
   141                              <1> Dir_Drive_Str:
   142 000139D3 54522D444F53204472- <1>                 db "TR-DOS Drive "
   142 000139DC 69766520            <1>
   143                              <1> Dir_Drive_Name:
   144 000139E0 303A                <1>                 db "0:"
   145 000139E2 0D0A                <1>                 db  0Dh, 0Ah
   146                              <1> Vol_Str_Header:
   147 000139E4 566F6C756D65204E61- <1>                 db "Volume Name: "
   147 000139ED 6D653A20            <1>
   148                              <1> Vol_Name:
   149 000139F1 00<rept>            <1> 		times 64 db 0
   150 00013A31 00                  <1> 		db 0
   151                              <1> Vol_Serial_Header:
   152 00013A32 0D0A                <1> 		db 0Dh, 0Ah
   153 00013A34 566F6C756D65205365- <1> 		db "Volume Serial No: "
   153 00013A3D 7269616C204E6F3A20  <1>
   154                              <1> Vol_Serial1:
   155 00013A46 30303030            <1> 		db "0000"
   156 00013A4A 2D                  <1> 		db "-"
   157                              <1> Vol_Serial2:
   158 00013A4B 30303030            <1> 		db "0000"
   159 00013A4F 0D0A00              <1> 		db 0Dh, 0Ah, 0
   160                              <1> 
   161                              <1> ;Vol_Tot_Sec_Str_Start:
   162                              <1> ;		dd 0
   163                              <1> Vol_Total_Sector_Header:
   164 00013A52 0D0A                <1> 		db 0Dh, 0Ah
   165 00013A54 566F6C756D65205369- <1> 		db "Volume Size : ", 0
   165 00013A5D 7A65203A2000        <1>
   166                              <1> ;Vol_Tot_Sec_Str: 
   167                              <1> ;		db "0000000000"
   168                              <1> ;Vol_Tot_Sec_Str_End:
   169                              <1> ;		db 0
   170                              <1> ;Vol_Free_Sectors_Str_Start:
   171                              <1> ;		dd 0
   172                              <1> Vol_Free_Sectors_Header:
   173 00013A63 467265652053706163- <1> 		db "Free Space  : ", 0
   173 00013A6C 6520203A2000        <1>
   174                              <1> ;Vol_Free_Sectors_Str:
   175                              <1> ;		db "0000000000"
   176                              <1> ;Vol_Free_Sectors_Str_End:
   177                              <1> ;		db 0
   178                              <1> 
   179                              <1> Dir_Str_Header:
   180 00013A72 4469726563746F7279- <1>                 db "Directory: "
   180 00013A7B 3A20                <1>
   181 00013A7D 2F                  <1> Dir_Str_Root:   db "/"
   182 00013A7E 00<rept>            <1> Dir_Str:        times 64 db 0
   183 00013ABE 00000000            <1>                 dd 0
   184 00013AC2 00                  <1>                 db 0
   185                              <1> 
   186                              <1> Msg_Bad_Command:
   187 00013AC3 42616420636F6D6D61- <1>                 db "Bad command or file name!"
   187 00013ACC 6E64206F722066696C- <1>
   187 00013AD5 65206E616D6521      <1>
   188 00013ADC 0D0A00              <1>                 db 0Dh, 0Ah, 0
   189                              <1> 
   190                              <1> msgl_drv_not_ready: 
   191 00013ADF 070D0A              <1> 		db 07h, 0Dh, 0Ah
   192                              <1> 
   193                              <1> ; CMD_INTR.ASM - 09/11/2011 - Messages
   194                              <1> 
   195                              <1> Msg_Not_Ready_Read_Err:
   196 00013AE2 4472697665206E6F74- <1>                 db "Drive not ready or read error!"
   196 00013AEB 207265616479206F72- <1>
   196 00013AF4 207265616420657272- <1>
   196 00013AFD 6F7221              <1>
   197 00013B00 0D0A00              <1>                 db 0Dh, 0Ah, 0
   198                              <1> 
   199                              <1> Msg_Not_Ready_Write_Err:
   200 00013B03 4472697665206E6F74- <1>                 db "Drive not ready or write error!"
   200 00013B0C 207265616479206F72- <1>
   200 00013B15 207772697465206572- <1>
   200 00013B1E 726F7221            <1>
   201 00013B22 0D0A00              <1>                 db 0Dh, 0Ah, 0
   202                              <1> 
   203                              <1> Msg_Dir_Not_Found:
   204 00013B25 4469726563746F7279- <1>                 db "Directory not found!"
   204 00013B2E 206E6F7420666F756E- <1>
   204 00013B37 6421                <1>
   205 00013B39 0D0A00              <1>                 db 0Dh, 0Ah, 0
   206                              <1> 
   207                              <1> Msg_File_Not_Found:
   208 00013B3C 46696C65206E6F7420- <1>                 db "File not found!"
   208 00013B45 666F756E6421        <1>
   209 00013B4B 0D0A00              <1>                 db 0Dh, 0Ah, 0
   210                              <1> 
   211                              <1> Msg_File_Directory_Not_Found:
   212 00013B4E 46696C65206F722064- <1>                 db "File or directory not found!"
   212 00013B57 69726563746F727920- <1>
   212 00013B60 6E6F7420666F756E64- <1>
   212 00013B69 21                  <1>
   213 00013B6A 0D0A00              <1>                 db 0Dh, 0Ah, 0
   214                              <1> 
   215                              <1> Msg_LongName_Not_Found:
   216 00013B6D 4C6F6E67206E616D65- <1>                 db "Long name not found!"
   216 00013B76 206E6F7420666F756E- <1>
   216 00013B7F 6421                <1>
   217 00013B81 0D0A00              <1>                 db 0Dh, 0Ah, 0
   218                              <1> 
   219                              <1> beep_Insufficient_Memory: ; 20/02/2017
   220 00013B84 0D0A                <1> 		db 0Dh, 0Ah
   221 00013B86 07                  <1> 		db 07h
   222                              <1> Msg_Insufficient_Memory:
   223 00013B87 496E73756666696369- <1>                 db "Insufficient memory!"
   223 00013B90 656E74206D656D6F72- <1>
   223 00013B99 7921                <1>
   224 00013B9B 0D0A00              <1>                 db 0Dh, 0Ah, 0
   225                              <1> 
   226                              <1> Msg_Error_Code:
   227 00013B9E 436F6D6D616E642066- <1>                 db 'Command failed! Error code : '
   227 00013BA7 61696C656421204572- <1>
   227 00013BB0 726F7220636F646520- <1>
   227 00013BB9 3A20                <1>
   228 00013BBB 303068              <1> error_code_hex: db '00h'
   229 00013BBE 0A0A00              <1>                 db 0Ah, 0Ah, 0
   230                              <1> 
   231 00013BC1 90                  <1> align 2
   232                              <1> 
   233                              <1> ; 10/02/2016
   234                              <1> ; DIR.ASM - 09/10/2011
   235                              <1> 
   236 00013BC2 3C4449523E20202020- <1> Type_Dir:       db '<DIR>     ' ; 10 bytes
   236 00013BCB 20                  <1>
   237                              <1> 
   238                              <1> File_Name:
   239 00013BCC 20<rept>            <1>                 times 12 db 20h
   240 00013BD8 20                  <1> 		db 20h
   241                              <1> Dir_Or_FileSize:
   242 00013BD9 20<rept>            <1>                 times 10 db 20h
   243 00013BE3 20                  <1> 		db 20h
   244                              <1> File_Attribute:
   245 00013BE4 20202020            <1> 		dd 20202020h
   246 00013BE8 20                  <1> 		db 20h
   247                              <1> File_Day:
   248 00013BE9 3030                <1>                 db '0','0'
   249 00013BEB 2F                  <1> 		db '/'
   250                              <1> File_Month:
   251 00013BEC 3030                <1>                 db '0','0'
   252 00013BEE 2F                  <1> 		db '/'
   253                              <1> File_Year:
   254 00013BEF 30303030            <1>                 db '0','0','0','0'
   255 00013BF3 20                  <1> 		db 20h
   256                              <1> File_Hour:
   257 00013BF4 3030                <1>                 db '0','0'
   258 00013BF6 3A                  <1> 		db ':'
   259                              <1> File_Minute:
   260 00013BF7 3030                <1>                 db '0','0'
   261 00013BF9 00                  <1> 		db 0
   262                              <1> 
   263                              <1> Decimal_File_Count_Header:
   264 00013BFA 0D0A                <1> 		db 0Dh, 0Ah
   265                              <1> Decimal_File_Count:
   266 00013BFC 00<rept>            <1> 		times 6 db 0
   267                              <1> 
   268 00013C02 2066696C6528732920- <1> str_files:	db " file(s) & "
   268 00013C0B 2620                <1>
   269                              <1> Decimal_Dir_Count: 
   270 00013C0D 00<rept>            <1> 		times 6 db 0
   271                              <1> str_dirs:       
   272 00013C13 206469726563746F72- <1> 		db " directory(s) "
   272 00013C1C 7928732920          <1>
   273 00013C21 0D0A00              <1> 		db 0Dh, 0Ah, 0
   274                              <1> 
   275 00013C24 206279746528732920- <1> str_bytes:	db " byte(s) in file(s)"
   275 00013C2D 696E2066696C652873- <1>
   275 00013C36 29                  <1>
   276 00013C37 0D0A00              <1> 		db 0Dh, 0Ah, 0
   277                              <1> 
   278                              <1> ; CMD_INTR.ASM - 09/11/2011
   279                              <1> ; 07/10/2010
   280                              <1> Msg_invalid_name_chars:
   281 00013C3A 496E76616C69642066- <1>                 db "Invalid file or directory name characters!"
   281 00013C43 696C65206F72206469- <1>
   281 00013C4C 726563746F7279206E- <1>
   281 00013C55 616D65206368617261- <1>
   281 00013C5E 637465727321        <1>
   282 00013C64 0D0A00              <1>         	db 0Dh, 0Ah, 0
   283                              <1> ; 21/02/2016
   284 00013C67 46696C65206F722064- <1> Msg_Name_Exists: db "File or directory name exists!"
   284 00013C70 69726563746F727920- <1>
   284 00013C79 6E616D652065786973- <1>
   284 00013C82 747321              <1>
   285 00013C85 0D0A00              <1>                 db 0Dh, 0Ah, 0
   286                              <1> Msg_DoYouWantMkdir:
   287 00013C88 446F20796F75207761- <1>                 db "Do you want to make directory ", 0
   287 00013C91 6E7420746F206D616B- <1>
   287 00013C9A 65206469726563746F- <1>
   287 00013CA3 72792000            <1>
   288 00013CA7 2028592F4E29203F20- <1> Msg_YesNo:      db " (Y/N) ? ", 0  
   288 00013CB0 00                  <1>
   289 00013CB1 000D0A00            <1> Y_N_nextline:	db 0, 0Dh, 0Ah, 0 
   290 00013CB5 4F4B2E0D0A00        <1> Msg_OK:		db "OK.", 0Dh, 0Ah, 0
   291                              <1> 
   292                              <1> ; 27/02/2016
   293                              <1> Msg_DoYouWantRmDir:
   294 00013CBB 446F20796F75207761- <1>                 db "Do you want to delete directory ", 0
   294 00013CC4 6E7420746F2064656C- <1>
   294 00013CCD 657465206469726563- <1>
   294 00013CD6 746F72792000        <1>
   295                              <1> Msg_Dir_Not_Empty:
   296 00013CDC 4469726563746F7279- <1>                 db "Directory not empty!"
   296 00013CE5 206E6F7420656D7074- <1>
   296 00013CEE 7921                <1>
   297 00013CF0 0D0A00              <1>                 db 0Dh, 0Ah, 0
   298                              <1> 
   299                              <1> Msg_DoYouWantDelete:
   300 00013CF3 446F20796F75207761- <1>                 db "Do you want to delete file ",0
   300 00013CFC 6E7420746F2064656C- <1>
   300 00013D05 6574652066696C6520- <1>
   300 00013D0E 00                  <1>
   301                              <1> 
   302 00013D0F 44656C657465642E2E- <1> Msg_Deleted:    db "Deleted...", 0Dh, 0Ah, 0
   302 00013D18 2E0D0A00            <1>
   303                              <1> 
   304                              <1> Msg_Permission_Denied:
   305 00013D1C 07                  <1>                 db 7
   306 00013D1D 5065726D697373696F- <1>                 db "Permission denied!", 0Dh, 0Ah, 0
   306 00013D26 6E2064656E69656421- <1>
   306 00013D2F 0D0A00              <1>
   307                              <1> 
   308                              <1> ; 04/03/2016
   309 00013D32 4E657720            <1> Msg_New:        db "New "
   310 00013D36 00                  <1>                 db 0
   311                              <1> Str_Attributes:
   312 00013D37 417474726962757465- <1>                 db "Attributes : "
   312 00013D40 73203A20            <1>
   313 00013D44 4E4F524D414C        <1> Attr_Chars:     db "NORMAL"
   314 00013D4A 00                  <1>                 db 0
   315                              <1> 
   316                              <1> ; 06/03/2016
   317                              <1> ; CMD_INTR.ASM - 16/11/2010 
   318                              <1> Msg_DoYouWantRename:
   319 00013D4B 446F20796F75207761- <1>                 db "Do you want to rename ", 0
   319 00013D54 6E7420746F2072656E- <1>
   319 00013D5D 616D652000          <1>
   320 00013D62 66696C652000        <1> Rename_File:    db "file ", 0
   321 00013D68 6469726563746F7279- <1> Rename_Directory: db "directory ", 0
   321 00013D71 2000                <1>
   322 00013D73 00<rept>            <1> Rename_OldName: times 13 db 0
   323 00013D80 20617320            <1> Msg_File_rename_as: db " as "
   324 00013D84 00<rept>            <1> Rename_NewName: times 13 db 0
   325                              <1> 
   326                              <1> ; 08/03/2016
   327                              <1> ; CMD_INTR.ASM - 01/08/2010 - 23/04/2011
   328                              <1> msg_not_same_drv:
   329 00013D91 4E6F742073616D6520- <1>                 db "Not same drive!" 
   329 00013D9A 647269766521        <1>
   330 00013DA0 0D0A00              <1>                 db 0Dh, 0Ah, 0 
   331                              <1> 
   332                              <1> Msg_DoYouWantMoveFile:
   333 00013DA3 446F20796F75207761- <1>                 db "Do you want to move file", 0
   333 00013DAC 6E7420746F206D6F76- <1>
   333 00013DB5 652066696C6500      <1>
   334                              <1> 
   335                              <1> msg_insufficient_disk_space:
   336 00013DBC 496E73756666696369- <1>                 db "Insufficient disk space!" 
   336 00013DC5 656E74206469736B20- <1>
   336 00013DCE 737061636521        <1>
   337 00013DD4 0D0A00              <1>                 db 0Dh, 0Ah, 0
   338                              <1> 
   339                              <1> ; 01/08/2010
   340                              <1> msg_source_file: 
   341 00013DD7 0D0A536F7572636520- <1> 		db 0Dh, 0Ah, "Source file name      :   "
   341 00013DE0 66696C65206E616D65- <1>
   341 00013DE9 2020202020203A2020- <1>
   341 00013DF2 20                  <1>
   342                              <1> msg_source_file_drv: 
   343 00013DF3 203A00              <1> 		db " :", 0
   344                              <1> msg_destination_file: 
   345 00013DF6 0D0A44657374696E61- <1> 		db 0Dh, 0Ah, "Destination file name :   "
   345 00013DFF 74696F6E2066696C65- <1>
   345 00013E08 206E616D65203A2020- <1>
   345 00013E11 20                  <1>
   346                              <1> msg_destination_file_drv: 
   347 00013E12 203A00              <1> 		db " :", 0
   348                              <1> msg_copy_nextline: 
   349 00013E15 0D0A00              <1> 		db 0Dh, 0Ah, 0
   350                              <1> 
   351                              <1> ; 15/03/2016
   352                              <1> ; CMD_INTR.ASM
   353                              <1> 
   354                              <1> Msg_DoYouWantOverWriteFile:
   355 00013E18 446F20796F75207761- <1>                 db "Do you want to overwrite file ",0
   355 00013E21 6E7420746F206F7665- <1>
   355 00013E2A 727772697465206669- <1>
   355 00013E33 6C652000            <1>
   356                              <1>   
   357                              <1> Msg_DoYouWantCopyFile:
   358 00013E37 446F20796F75207761- <1>                 db "Do you want to copy file",0
   358 00013E40 6E7420746F20636F70- <1>
   358 00013E49 792066696C6500      <1>
   359                              <1> 
   360                              <1> Msg_read_file_error_before_EOF:
   361 00013E50 46696C652072656164- <1> 		db "File reading error! (before EOF)"
   361 00013E59 696E67206572726F72- <1>
   361 00013E62 2120286265666F7265- <1>
   361 00013E6B 20454F4629          <1>
   362 00013E70 0A0A00              <1> 		db 0Ah, 0Ah, 0
   363                              <1> 
   364                              <1> ; 18/03/2016
   365                              <1> ; TRDOS 386 (v2.0) mainprog copy procedure
   366                              <1> msg_reading:
   367 00013E73 52656164696E672E2E- <1> 		db "Reading... ", 0
   367 00013E7C 2E2000              <1>
   368                              <1> msg_writing:
   369 00013E7F 57726974696E672E2E- <1> 		db "Writing... ", 0
   369 00013E88 2E2000              <1>
   370                              <1> percentagestr:
   371 00013E8B 2020202500          <1> 		db "   %", 0  ; "  0%" .. "100%"
   372                              <1> ; 11/04/2016
   373                              <1> Msg_No_Set_Space:
   374 00013E90 496E73756666696369- <1>                 db "Insufficient environment space!"
   374 00013E99 656E7420656E766972- <1>
   374 00013EA2 6F6E6D656E74207370- <1>
   374 00013EAB 61636521            <1>
   375 00013EAF 0D0A00              <1>                 db 0Dh, 0Ah, 0
   376                              <1> ; 18/04/2016
   377                              <1> isc_msg:	
   378 00013EB2 0D0A                <1> 		db 0Dh, 0Ah
   379 00013EB4 494E56414C49442053- <1> 		db "INVALID SYSTEM CALL", 0
   379 00013EBD 595354454D2043414C- <1>
   379 00013EC6 4C00                <1>
   380                              <1> usi_msg:
   381 00013EC8 0D0A                <1> 		db 0Dh, 0Ah
   382 00013ECA 554E444546494E4544- <1> 		db "UNDEFINED SOFTWARE INTERRUPT", 0
   382 00013ED3 20534F465457415245- <1>
   382 00013EDC 20494E544552525550- <1>
   382 00013EE5 5400                <1>
   383                              <1> ifc_msg:
   384 00013EE7 0D0A                <1> 		db 0Dh, 0Ah
   385 00013EE9 494E56414C49442046- <1> 		db "INVALID FUNCTION CALL"
   385 00013EF2 554E4354494F4E2043- <1>
   385 00013EFB 414C4C              <1>
   386                              <1> inv_msg_for_trdos_v2:
   387 00013EFE 20                  <1> 		db 20h
   388 00013EFF 666F72205452444F53- <1> 		db "for TRDOS v2!"
   388 00013F08 20763221            <1>
   389 00013F0C 07                  <1> 		db 07h
   390 00013F0D 0D0A                <1> 		db 0Dh, 0Ah
   391 00013F0F 0D0A                <1> 		db 0Dh, 0Ah
   392 00013F11 494E5420            <1> 		db "INT "
   393 00013F15 303068              <1> int_num_str:	db "00h"
   394 00013F18 0D0A                <1> 		db 0Dh, 0Ah
   395 00013F1A 454158203A20        <1> 		db "EAX : "
   396 00013F20 303030303030303068- <1> eax_str:	db "00000000h", 0Dh, 0Ah
   396 00013F29 0D0A                <1>
   397 00013F2B 454950203A20        <1> 		db "EIP : "
   398 00013F31 303030303030303068- <1> eip_str:	db "00000000h", 0Dh, 0Ah, 0
   398 00013F3A 0D0A00              <1>
   399                              <1> 
   400                              <1> ; 07/10/2016
   401                              <1> ; Device names & parameters (for kernel devices)
   402                              <1> 
   403 00013F3D 90                  <1> align 2
   404                              <1> KDEV_NAME:
   405 00013F3E 5454590000000000    <1> 		db 'TTY',0,0,0,0,0 ; 1
   406 00013F46 4D454D0000000000    <1> 		db 'MEM',0,0,0,0,0 ; 2
   407 00013F4E 4644300000000000    <1> 		db 'FD0',0,0,0,0,0 ; 3
   408 00013F56 4644310000000000    <1> 		db 'FD1',0,0,0,0,0 ; 4
   409 00013F5E 4844300000000000    <1> 		db 'HD0',0,0,0,0,0 ; 5
   410 00013F66 4844310000000000    <1> 		db 'HD1',0,0,0,0,0 ; 6
   411 00013F6E 4844320000000000    <1> 		db 'HD2',0,0,0,0,0 ; 7
   412 00013F76 4844330000000000    <1> 		db 'HD3',0,0,0,0,0 ; 8
   413 00013F7E 4C50540000000000    <1> 		db 'LPT',0,0,0,0,0 ; 9
   414 00013F86 5454593000000000    <1> 		db 'TTY0',0,0,0,0 ; 10
   415 00013F8E 5454593100000000    <1> 		db 'TTY1',0,0,0,0 ; 11
   416 00013F96 5454593200000000    <1> 		db 'TTY2',0,0,0,0 ; 12
   417 00013F9E 5454593300000000    <1> 		db 'TTY3',0,0,0,0 ; 13
   418 00013FA6 5454593400000000    <1> 		db 'TTY4',0,0,0,0 ; 14
   419 00013FAE 5454593500000000    <1> 		db 'TTY5',0,0,0,0 ; 15
   420 00013FB6 5454593600000000    <1> 		db 'TTY6',0,0,0,0 ; 16
   421 00013FBE 5454593700000000    <1> 		db 'TTY7',0,0,0,0 ; 17
   422 00013FC6 5454593800000000    <1> 		db 'TTY8',0,0,0,0 ; 18
   423 00013FCE 5454593900000000    <1> 		db 'TTY9',0,0,0,0 ; 19
   424 00013FD6 434F4D3100000000    <1> 		db 'COM1',0,0,0,0 ; 18
   425 00013FDE 434F4D3200000000    <1> 		db 'COM2',0,0,0,0 ; 19
   426                              <1> 		;db 'CONSOLE',0	  ; 1
   427                              <1> 		;db 'PRINTER',0   ; 9
   428                              <1> 		;db 'CDROM'	  ; 20
   429                              <1> 		;db 'CDROM0'	  ; 20
   430                              <1> 		;db 'CDROM1'	  ; 21		
   431                              <1> 		;db 'DVD'	  ; 22
   432                              <1> 		;db 'DVD0'	  ; 22
   433                              <1> 		;db 'DVD1'	  ; 23		
   434                              <1> 		;db 'USB'	  ; 24
   435                              <1> 		;db 'USB0'	  ; 24
   436                              <1> 		;db 'USB1'	  ; 25
   437                              <1> 		;db 'USB2'	  ; 26
   438                              <1> 		;db 'USB3'        ; 27
   439                              <1> 		;db 'KEYBOARD'	  ; 1	
   440                              <1> 		;db 'MOUSE'	  ; 28
   441                              <1> 		;db 'SOUND'	  ; 29
   442                              <1> 		;db 'VGA',0,0,0,0 ; 30
   443                              <1> 		;db 'CGA',0,0,0,0 ; 31
   444                              <1> 		;db 'AUDIO',0,0,0 ; 29
   445                              <1> 		;db 'VIDEO',0,0,0 ; 32
   446                              <1> 		;db 'MUSIC',0,0,0 ; 33
   447                              <1> 		;db 'ETHERNET'	  ; 34 		
   448                              <1> 		;db 'SD0',0,0,0,0,0 ; 35
   449                              <1> 		;db 'SD1',0,0,0,0,0 ; 36
   450                              <1> 		;db 'SD2',0,0,0,0,0 ; 37
   451                              <1> 		;db 'SD3',0,0,0,0,0 ; 38
   452                              <1> 		;db 'SATA0'	  ; 35
   453                              <1> 		;db 'SATA1'	  ; 36
   454                              <1> 		;db 'SATA2'        ; 37
   455                              <1> 		;db 'SATA3'        ; 38
   456                              <1> 		;db 'PATA0',0,0,0  ; 5
   457                              <1> 		;db 'PATA1',0,0,0  ; 6
   458                              <1> 		;db 'PATA2',0,0,0  ; 7
   459                              <1> 		;db 'PATA3',0,0,0  ; 8
   460                              <1> 		;db 'WIRELESS'	  ; 39
   461                              <1> 		;db 'HDMI',0,0,0,0 ; 40
   462 00013FE6 4E554C4C00000000    <1> 		db 'NULL',0,0,0,0 ; 0
   463                              <1> 
   464                              <1> NumOfKernelDevNames equ ($-KDEV_NAME) / 8 ; 20 (07/10/2016)
   465                              <1> 
   466                              <1> KDEV_NUMBER:
   467 00013FEE 010203040506070809  <1> 		db 1,2,3,4,5,6,7,8,9
   468 00013FF7 0A0B0C0D0E0F101112- <1> 		db 10,11,12,13,14,15,16,17,18,19
   468 00014000 13                  <1>
   469 00014001 121300              <1> 		db 18,19,0
   470                              <1> 
   471                              <1> NumOfKernelDevices equ $ - KDEV_NUMBER
   472                              <1> 
   473                              <1> KDEV_OADDR:
   474 00014004 [21380100]          <1> 		dd otty ;tty  ; 1
   475 00014008 [21380100]          <1> 		dd sret ;mem  ; 2
   476 0001400C [21380100]          <1>  		dd sret ;fd0  ; 3
   477 00014010 [21380100]          <1>  		dd sret ;fd1  ; 4
   478 00014014 [21380100]          <1>  		dd sret ;hd0  ; 5
   479 00014018 [21380100]          <1>  		dd sret ;hd1  ; 6
   480 0001401C [21380100]          <1>  		dd sret ;hd2  ; 7
   481 00014020 [21380100]          <1>  		dd sret ;hd3  ; 8
   482 00014024 [21380100]          <1>  		dd sret ;lpt  ; 9
   483 00014028 [21380100]          <1>  		dd ocvt ;tty0 ; 10
   484 0001402C [21380100]          <1> 		dd ocvt ;tty1 ; 11
   485 00014030 [21380100]          <1>  		dd ocvt ;tty2 ; 12
   486 00014034 [21380100]          <1>  		dd ocvt ;tty3 ; 13
   487 00014038 [21380100]          <1>  		dd ocvt ;tty4 ; 14
   488 0001403C [21380100]          <1>  		dd ocvt ;tty5 ; 15
   489 00014040 [21380100]          <1>  		dd ocvt ;tty6 ; 16
   490 00014044 [21380100]          <1>  		dd ocvt ;tty7 ; 17
   491 00014048 [21380100]          <1>  		dd ocvt ;tty8 ; 18
   492 0001404C [21380100]          <1>  		dd ocvt ;tty9 ; 19
   493                              <1>  		;dd ocvt ;com1 ; 18
   494                              <1>  		;dd ocvt ;com2 ; 19
   495 00014050 [21380100]          <1> 		dd sret ;null ; 20  
   496                              <1> KDEV_CADDR:
   497 00014054 [21380100]          <1> 		dd ctty ;tty  ; 1
   498 00014058 [21380100]          <1> 		dd cret ;mem  ; 2
   499 0001405C [21380100]          <1>  		dd cret ;fd0  ; 3
   500 00014060 [21380100]          <1>  		dd cret ;fd1  ; 4
   501 00014064 [21380100]          <1>  		dd cret ;hd0  ; 5
   502 00014068 [21380100]          <1>  		dd cret ;hd1  ; 6
   503 0001406C [21380100]          <1>  		dd cret ;hd2  ; 7
   504 00014070 [21380100]          <1>  		dd cret ;hd3  ; 8
   505 00014074 [21380100]          <1>  		dd cret ;lpt  ; 9
   506 00014078 [21380100]          <1>  		dd ocvt ;tty0 ; 10
   507 0001407C [21380100]          <1> 		dd ccvt ;tty1 ; 11
   508 00014080 [21380100]          <1>  		dd ccvt ;tty2 ; 12
   509 00014084 [21380100]          <1>  		dd ccvt ;tty3 ; 13
   510 00014088 [21380100]          <1>  		dd ccvt ;tty4 ; 14
   511 0001408C [21380100]          <1>  		dd ccvt ;tty5 ; 15
   512 00014090 [21380100]          <1>  		dd ccvt ;tty6 ; 16
   513 00014094 [21380100]          <1>  		dd ccvt ;tty7 ; 17
   514 00014098 [21380100]          <1>  		dd ccvt ;tty8 ; 18
   515 0001409C [21380100]          <1>  		dd ccvt ;tty9 ; 19
   516                              <1>  		;dd ccvt ;com1 ; 18
   517                              <1>  		;dd ccvt ;com2 ; 19
   518 000140A0 [21380100]          <1> 		dd cret ;null ; 20
   519                              <1> 
   520                              <1> KDEV_RADDR:
   521 000140A4 [21380100]          <1> 		dd rtty ;tty  ; 1
   522 000140A8 [21380100]          <1> 		dd rmem ;mem  ; 2
   523 000140AC [21380100]          <1>  		dd rfd  ;fd0  ; 3
   524 000140B0 [21380100]          <1>  		dd rfd  ;fd1  ; 4
   525 000140B4 [21380100]          <1>  		dd rhd  ;hd0  ; 5
   526 000140B8 [21380100]          <1>  		dd rhd  ;hd1  ; 6
   527 000140BC [21380100]          <1>  		dd rhd  ;hd2  ; 7
   528 000140C0 [21380100]          <1>  		dd rhd  ;hd3  ; 8
   529 000140C4 [21380100]          <1>  		dd rlpt ;lpt  ; 9
   530 000140C8 [21380100]          <1>  		dd rcvt ;tty0 ; 10
   531 000140CC [21380100]          <1> 		dd rcvt ;tty1 ; 11
   532 000140D0 [21380100]          <1>  		dd rcvt ;tty2 ; 12
   533 000140D4 [21380100]          <1>  		dd rcvt ;tty3 ; 13
   534 000140D8 [21380100]          <1>  		dd rcvt ;tty4 ; 14
   535 000140DC [21380100]          <1>  		dd rcvt ;tty5 ; 15
   536 000140E0 [21380100]          <1>  		dd rcvt ;tty6 ; 16
   537 000140E4 [21380100]          <1>  		dd rcvt ;tty7 ; 17
   538 000140E8 [21380100]          <1>  		dd rcvt ;tty8 ; 18
   539 000140EC [21380100]          <1>  		dd rcvt ;tty9 ; 19
   540                              <1>  		;dd rcvt ;com1 ; 18
   541                              <1>  		;dd rcvt ;com2 ; 19
   542 000140F0 [052C0100]          <1> 		dd rnull ;null ; 20  
   543                              <1> KDEV_WADDR:
   544 000140F4 [21380100]          <1> 		dd wtty ;tty  ; 1
   545 000140F8 [21380100]          <1> 		dd wmem ;mem  ; 2
   546 000140FC [21380100]          <1>  		dd wfd  ;fd0  ; 3
   547 00014100 [21380100]          <1>  		dd wfd  ;fd1  ; 4
   548 00014104 [21380100]          <1>  		dd whd  ;hd0  ; 5
   549 00014108 [21380100]          <1>  		dd whd  ;hd1  ; 6
   550 0001410C [21380100]          <1>  		dd whd  ;hd2  ; 7
   551 00014110 [21380100]          <1>  		dd whd  ;hd3  ; 8
   552 00014114 [21380100]          <1>  		dd wlpt ;lpt  ; 9
   553 00014118 [21380100]          <1>  		dd xmtt ;tty0 ; 10
   554 0001411C [21380100]          <1> 		dd xmtt ;tty1 ; 11
   555 00014120 [21380100]          <1>  		dd xmtt ;tty2 ; 12
   556 00014124 [21380100]          <1>  		dd xmtt ;tty3 ; 13
   557 00014128 [21380100]          <1>  		dd xmtt ;tty4 ; 14
   558 0001412C [21380100]          <1>  		dd xmtt ;tty5 ; 15
   559 00014130 [21380100]          <1>  		dd xmtt ;tty6 ; 16
   560 00014134 [21380100]          <1>  		dd xmtt ;tty7 ; 17
   561 00014138 [21380100]          <1>  		dd xmtt ;tty8 ; 18
   562 0001413C [21380100]          <1>  		dd xmtt ;tty9 ; 19
   563                              <1>  		;dd xmtt ;com1 ; 18
   564                              <1>  		;dd xmtt ;com2 ; 19
   565 00014140 [062C0100]          <1> 		dd wnull ;null ; 20  
   566                              <1> 
   567                              <1> ; DEV_ACCESS bits:
   568                              <1> 	; bit 0 = accessable by normal users
   569                              <1> 	; bit 1 = read access permission
   570                              <1> 	; bit 2 = write access permission
   571                              <1> 	; bit 3 = IOCTL permission to users
   572                              <1> 	; bit 4 = block device if it is set
   573                              <1> 	; bit 5 = 16 bit or 1024 byte data
   574                              <1> 	; bit 6 = 32 bit or 2048 byte data
   575                              <1> 	; bit 7 = installable device driver	
   576                              <1> 
   577                              <1> KDEV_ACCESS: ; 08/10/2016
   578 00014144 07                  <1> 		db  00000111b	; tty, 1
   579 00014145 07                  <1> 		db  00000111b	; mem, 2	
   580 00014146 8F                  <1> 		db  10001111b	; fd0, 3	
   581 00014147 8F                  <1> 		db  10001111b	; fd1, 4
   582 00014148 8F                  <1> 		db  10001111b	; hd0, 5
   583 00014149 8F                  <1> 		db  10001111b	; hd1, 6
   584 0001414A 8F                  <1> 		db  10001111b	; hd2, 7
   585 0001414B 8F                  <1> 		db  10001111b	; hd3, 8
   586 0001414C 07                  <1> 		db  00000111b   ; lpt, 9
   587 0001414D 07                  <1> 		db  00000111b	; tty0, 10
   588 0001414E 07                  <1> 		db  00000111b	; tty1, 11
   589 0001414F 07                  <1> 		db  00000111b	; tty2, 12
   590 00014150 07                  <1> 		db  00000111b	; tty3, 13
   591 00014151 07                  <1> 		db  00000111b	; tty4, 14
   592 00014152 07                  <1> 		db  00000111b	; tty5, 15
   593 00014153 07                  <1> 		db  00000111b	; tty6, 16
   594 00014154 07                  <1> 		db  00000111b	; tty7, 17
   595 00014155 07                  <1> 		db  00000111b	; tty8, 18
   596 00014156 07                  <1> 		db  00000111b	; tty9, 19
   597                              <1> 		;db 00000111b	; com1, 18
   598                              <1> 		;db 00000111b	; com2, 19
   599 00014157 00                  <1> 		db  00000000b   ; null, 0
   600                              <1> 
   601                              <1> ; 07/10/2016
   602                              <1> NumOfInstallableDevices equ 8
   603                              <1> NUMIDEV		equ NumOfInstallableDevices ; 8
   604                              <1> NUMOFDEVICES	equ NumOfKernelDevices + NumOfInstallableDevices
   605                              <1> 
   606                              <1> ; 26/02/2017
   607                              <1> ; IRQ Callback (& Signal Response Byte) service availibity
   608                              <1> ; 'syscalbac'
   609                              <1> ; ***************************************************
   610                              <1> ; IRQ 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
   611                              <1> ; --- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
   612                              <1> ; --- 00 00 00 01 02 03 00 04 00 05 06 07 08 09 00 00
   613                              <1> ; ***************************************************
   614                              <1> IRQenum:
   615 00014158 000000010203000400- <1> 	db  0,0,0,1,2,3,0,4,0,5,6,7,8,9,0,0
   615 00014161 05060708090000      <1>
   616                              <1> 
   617                              <1> ; 28/08/2017
   618                              <1> ; 20/08/2017
   619                              <1> ; DMA Registers (for 'sysdma')
   620                              <1> ; 02/07/2017 (sb16mod.s)
   621 00014168 00020406C0C4C8CC    <1> dma_adr:	db 0,2,4,6,0C0h,0C4h,0C8h,0CCh
   622 00014170 01030507C2C6CACE    <1> dma_cnt:	db 1,3,5,7,0C2h,0C6h,0CAh,0CEh
   623 00014178 878381828F8B898A    <1> dma_page:	db 87h,83h,81h,82h,8Fh,8Bh,89h,8Ah ; 03/08/2017
   624 00014180 0A0A0A0AD4D4D4D4    <1> dma_mask:	db 0Ah,0Ah,0Ah,0Ah,0D4h,0D4h,0D4h,0D4h
   625 00014188 0B0B0B0BD6D6D6D6    <1> dma_mod:	db 0Bh,0Bh,0Bh,0Bh,0D6h,0D6h,0D6h,0D6h
   626 00014190 0C0C0C0CD8D8D8D8    <1> dma_flip:	db 0Ch,0Ch,0Ch,0Ch,0D8h,0D8h,0D8h,0D8h	
  3088                                  
  3089                                  ; 27/08/2014
  3090                                  scr_row:
  3091 00014198 E0810B00                	dd 0B8000h + 0A0h + 0A0h + 0A0h ; Row 3
  3092                                  scr_col:
  3093 0001419C 00000000                	dd 0
  3094                                  
  3095                                  Align 4
  3096                                  	; 15/04/2016
  3097                                  	; TRDOS 386 (TRDOS v2.0)
  3098                                  
  3099                                  	; 21/08/2014
  3100                                  ilist:
  3101                                  	;times 	32 dd cpu_except ; INT 0 to INT 1Fh
  3102                                  	;
  3103                                  	; Exception list
  3104                                  	; 25/08/2014	
  3105 000141A0 [E20B0000]              	dd	exc0	; 0h,  Divide-by-zero Error
  3106 000141A4 [E90B0000]              	dd	exc1	
  3107 000141A8 [F00B0000]              	dd 	exc2	
  3108 000141AC [F70B0000]              	dd	exc3	
  3109 000141B0 [FB0B0000]              	dd	exc4	
  3110 000141B4 [FF0B0000]              	dd	exc5	
  3111 000141B8 [030C0000]              	dd 	exc6	; 06h,  Invalid Opcode
  3112 000141BC [070C0000]              	dd	exc7	
  3113 000141C0 [0B0C0000]              	dd	exc8	
  3114 000141C4 [0F0C0000]              	dd	exc9	
  3115 000141C8 [130C0000]              	dd 	exc10	
  3116 000141CC [170C0000]              	dd	exc11
  3117 000141D0 [1B0C0000]              	dd	exc12
  3118 000141D4 [1F0C0000]              	dd	exc13	; 0Dh, General Protection Fault
  3119 000141D8 [230C0000]              	dd 	exc14	; 0Eh, Page Fault
  3120 000141DC [270C0000]              	dd	exc15
  3121 000141E0 [2B0C0000]              	dd	exc16
  3122 000141E4 [2F0C0000]              	dd	exc17
  3123 000141E8 [330C0000]              	dd 	exc18
  3124 000141EC [370C0000]              	dd	exc19
  3125 000141F0 [3B0C0000]              	dd 	exc20
  3126 000141F4 [3F0C0000]              	dd	exc21
  3127 000141F8 [430C0000]              	dd	exc22
  3128 000141FC [470C0000]              	dd	exc23
  3129 00014200 [4B0C0000]              	dd 	exc24
  3130 00014204 [4F0C0000]              	dd	exc25
  3131 00014208 [530C0000]              	dd	exc26
  3132 0001420C [570C0000]              	dd	exc27
  3133 00014210 [5B0C0000]              	dd 	exc28
  3134 00014214 [5F0C0000]              	dd	exc29
  3135 00014218 [630C0000]              	dd 	exc30
  3136 0001421C [670C0000]              	dd	exc31
  3137                                  IRQ_list: ; 28/02/2017 ('syscalbac')
  3138                                  	; Interrupt list
  3139 00014220 [56090000]              	dd	timer_int	; INT 20h
  3140                                  		;dd	irq0	
  3141 00014224 [CE100000]              	dd	kb_int		; 24/01/2016
  3142                                  		;dd	irq1
  3143 00014228 [380B0000]              	dd	irq2
  3144                                  		; COM2 int
  3145 0001422C [3C0B0000]              	dd	irq3
  3146                                  		; COM1 int
  3147 00014230 [470B0000]              	dd	irq4
  3148 00014234 [520B0000]              	dd	irq5
  3149                                  ;DISKETTE_INT: ;06/02/2015
  3150 00014238 [C9510000]              	dd	fdc_int		; 16/02/2015, IRQ 6 handler	
  3151                                  		;dd	irq6
  3152                                  ; Default IRQ 7 handler against spurious IRQs (from master PIC)
  3153                                  ; 25/02/2015 (source: http://wiki.osdev.org/8259_PIC)
  3154 0001423C [C10E0000]              	dd	default_irq7	; 25/02/2015
  3155                                  		;dd	irq7
  3156                                  ; Real Time Clock Interrupt
  3157 00014240 [C10A0000]              	dd	rtc_int		; 23/02/2015, IRQ 8 handler
  3158                                  		;dd	irq8	; INT 28h
  3159 00014244 [620B0000]              	dd	irq9
  3160 00014248 [660B0000]              	dd	irq10
  3161 0001424C [6A0B0000]              	dd	irq11
  3162 00014250 [6E0B0000]              	dd	irq12
  3163 00014254 [720B0000]              	dd	irq13
  3164                                  ;HDISK_INT1:  ;06/02/2015 	
  3165 00014258 [7C5B0000]              	dd	hdc1_int 	; 21/02/2015, IRQ 14 handler		
  3166                                  		;dd	irq14
  3167                                  ;HDISK_INT2:  ;06/02/2015
  3168 0001425C [A35B0000]              	dd	hdc2_int 	; 21/02/2015, IRQ 15 handler		
  3169                                  		;dd	irq15	; INT 2Fh
  3170                                  		; 14/08/2015
  3171                                  	;dd	sysent		; INT 30h (system calls)
  3172                                  
  3173                                  	; 15/04/2016
  3174                                  	; TRDOS 386(TRDOS v2.0) Software Interrupts
  3175                                  
  3176 00014260 [BD420100]              	dd	int30h		; Reserved for
  3177                                  				; !!! Retro UNIX (RUNIX) !!!
  3178                                  				; !!! SINGLIX !!! System Calls
  3179 00014264 [C1170000]              	dd	int31h		; Video BIOS (IBM PC/AT, Int 10h)
  3180 00014268 [ED0E0000]              	dd	int32h		; Keyboard Functions (IBM PC/AT, Int 16h)
  3181 0001426C [80520000]              	dd	int33h		; DISK I/O (IBM PC/AT, Int 13h)
  3182 00014270 [B8240100]              	dd	int34h		; #IOCTL# (I/O port access support for ring 3)
  3183 00014274 [346A0000]              	dd	int35h		; Time/Date Functions (IBM PC/AT, Int 1Ah)
  3184 00014278 [750D0000]              	dd	ignore_int	; INT 36h : Timer Functions	
  3185 0001427C [750D0000]              	dd	ignore_int	; INT 37h	
  3186 00014280 [750D0000]              	dd	ignore_int	; INT 38h
  3187 00014284 [750D0000]              	dd	ignore_int	; INT 39h
  3188 00014288 [750D0000]              	dd	ignore_int	; INT 3Ah	
  3189 0001428C [750D0000]              	dd	ignore_int	; INT 3Bh
  3190 00014290 [750D0000]              	dd	ignore_int	; INT 3Ch
  3191 00014294 [750D0000]              	dd	ignore_int	; INT 3Dh	
  3192 00014298 [750D0000]              	dd	ignore_int	; INT 3Eh
  3193 0001429C [750D0000]              	dd	ignore_int	; INT 3Fh
  3194 000142A0 [9AD70000]              	dd	sysent		; INT 40h : !!! TRDOS 386 System Calls !!!
  3195                                  	;dd	ignore_int
  3196 000142A4 00000000                	dd	0
  3197                                  
  3198                                  ; 20/08/2014
  3199                                    ; /* This is the default interrupt "handler" :-) */ 
  3200                                    ; Linux v0.12 (head.s)
  3201                                  int_msg:
  3202 000142A8 556E6B6E6F776E2069-     	db "Unknown interrupt ! ", 0
  3202 000142B1 6E7465727275707420-
  3202 000142BA 212000             
  3203                                  
  3204                                  ; 15/04/2016
  3205                                  ; TRDOS 386 (TRDOS v2.0)
  3206                                  
  3207                                  ; 29/04/2016
  3208                                  int30h:
  3209                                  trdos_isc_routine:
  3210                                  	; 02/05/2016
  3211                                  	; 01/05/2016
  3212                                  	; 29/04/2016
  3213                                  	; 18/04/2016
  3214                                  	; 15/04/2016 (TRDOS 386 = TRDOS v2.0)
  3215                                  	; 17/04/2011 (TRDOS v1.0, 'IFC.ASM')
  3216                                  	; 03/02/2011 ('trdos_ifc_routine')
  3217                                  	;
  3218 000142BD 8B1C24                  	mov	ebx, [esp] ; EIP (next)
  3219 000142C0 83EB02                  	sub	ebx, 2 ; EIP (CD ##h)
  3220                                  
  3221 000142C3 89C1                    	mov	ecx, eax
  3222 000142C5 8A4301                  	mov	al, [ebx+1] ; CDh ##h
  3223                                  
  3224 000142C8 66BA1000                	mov	dx, KDATA
  3225 000142CC 8EDA                    	mov	ds, dx
  3226 000142CE 8EC2                    	mov	es, dx
  3227                                  
  3228 000142D0 FC                      	cld
  3229 000142D1 8B15[90810100]          	mov	edx, [k_page_dir]
  3230 000142D7 0F22DA                  	mov	cr3, edx
  3231                                  
  3232 000142DA E8E4FFFEFF              	call	bytetohex
  3233 000142DF 66A3[153F0100]          	mov	[int_num_str], ax
  3234                                  
  3235 000142E5 89D8                    	mov	eax, ebx ; EIP
  3236 000142E7 E81700FFFF              	call	dwordtohex
  3237 000142EC 8915[313F0100]          	mov	[eip_str], edx
  3238 000142F2 A3[353F0100]            	mov	[eip_str+4], eax
  3239                                  
  3240 000142F7 89C8                    	mov	eax, ecx
  3241 000142F9 E80500FFFF              	call	dwordtohex
  3242 000142FE 8915[203F0100]          	mov	[eax_str], edx
  3243 00014304 A3[243F0100]            	mov	[eax_str+4], eax 	
  3244                                  
  3245 00014309 43                      	inc	ebx
  3246 0001430A 8A03                    	mov	al, [ebx] ; Interrupt number
  3247                                  
  3248                                  trdos_isc_handler:
  3249 0001430C 80FE30                  	cmp	dh, 30h ; Retro UNIX, SINGLIX System calls
  3250 0001430F 7507                    	jne	short trdos_usi_handler
  3251 00014311 BE[B23E0100]            	mov	esi, isc_msg
  3252 00014316 EB05                    	jmp	short loc_write_inv_system_call_msg
  3253                                  
  3254                                  trdos_usi_handler:
  3255 00014318 BE[C83E0100]            	mov	esi, usi_msg
  3256                                  
  3257                                  loc_write_inv_system_call_msg:
  3258 0001431D E82332FFFF              	call	print_msg
  3259                                  	; 29/04/2016
  3260 00014322 BE[FE3E0100]            	mov	esi, inv_msg_for_trdos_v2
  3261 00014327 E81932FFFF              	call	print_msg
  3262                                  
  3263                                  loc_ifc_terminate_process:
  3264                                  	; u.uno = process number
  3265                                  	; 29/04/2016
  3266                                  
  3267                                  	; 02/05/2016
  3268 0001432C FE05[5B030300]          	inc	byte [sysflg] ; 0FFh -> 0
  3269                                  
  3270 00014332 B801000000              	mov	eax, 1
  3271 00014337 E93797FFFF              	jmp	sysexit
  3272                                  
  3273                                  ; 07/03/2015
  3274                                  ; Temporary Code
  3275                                  display_disks:
  3276 0001433C 803D[EE6D0000]00        	cmp 	byte [fd0_type], 0
  3277 00014343 7605                    	jna 	short ddsks1
  3278 00014345 E87D000000              	call	pdskm
  3279                                  ddsks1:
  3280 0001434A 803D[EF6D0000]00        	cmp	byte [fd1_type], 0
  3281 00014351 760C                    	jna	short ddsks2
  3282 00014353 C605[97440100]31        	mov	byte [dskx], '1'
  3283 0001435A E868000000              	call	pdskm
  3284                                  ddsks2:
  3285 0001435F 803D[F06D0000]00        	cmp	byte [hd0_type], 0
  3286 00014366 7654                    	jna	short ddsk6
  3287 00014368 66C705[95440100]68-     	mov	word [dsktype], 'hd'
  3287 00014370 64                 
  3288 00014371 C605[97440100]30        	mov	byte [dskx], '0'
  3289 00014378 E84A000000              	call	pdskm
  3290                                  ddsks3:
  3291 0001437D 803D[F16D0000]00        	cmp	byte [hd1_type], 0
  3292 00014384 7636                    	jna	short ddsk6
  3293 00014386 C605[97440100]31        	mov	byte [dskx], '1'
  3294 0001438D E835000000              	call	pdskm
  3295                                  ddsks4:
  3296 00014392 803D[F26D0000]00        	cmp	byte [hd2_type], 0
  3297 00014399 7621                    	jna	short ddsk6
  3298 0001439B C605[97440100]32        	mov	byte [dskx], '2'
  3299 000143A2 E820000000              	call	pdskm
  3300                                  ddsks5:
  3301 000143A7 803D[F36D0000]00        	cmp	byte [hd3_type], 0
  3302 000143AE 760C                    	jna	short ddsk6
  3303 000143B0 C605[97440100]33        	mov	byte [dskx], '3'
  3304 000143B7 E80B000000              	call	pdskm
  3305                                  ddsk6:
  3306 000143BC BE[BF440100]            	mov	esi, nextline
  3307 000143C1 E806000000              	call	pdskml
  3308                                  pdskm_ok:
  3309 000143C6 C3                      	retn
  3310                                  pdskm:
  3311 000143C7 BE[93440100]            	mov	esi, dsk_ready_msg
  3312                                  pdskml:	
  3313 000143CC AC                      	lodsb
  3314 000143CD 08C0                    	or	al, al
  3315 000143CF 74F5                    	jz	short pdskm_ok
  3316 000143D1 56                      	push	esi
  3317                                  	; 13/05/2016
  3318 000143D2 BB07000000                      mov     ebx, 7  ; Black background, 
  3319                                  			; light gray forecolor
  3320                                  			; Video page 0 (bh=0)
  3321 000143D7 E821DFFEFF              	call	_write_tty
  3322 000143DC 5E                      	pop	esi
  3323 000143DD EBED                    	jmp	short pdskml
  3324                                  
  3325 000143DF 90                      Align 2
  3326                                  	; 21/08/2014
  3327                                  exc_msg:
  3328 000143E0 435055206578636570-     	db "CPU exception ! "
  3328 000143E9 74696F6E202120     
  3329                                  excnstr: 		; 25/08/2014
  3330 000143F0 3F3F68202045495020-     	db "??h", "  EIP : "
  3330 000143F9 3A20               
  3331                                  EIPstr: ; 29/08/2014
  3332 000143FB 00<rept>                	times 12 db 0
  3333                                  
  3334                                  	; 23/02/2015
  3335                                  	; 25/08/2014
  3336                                  ;scounter:
  3337                                  ;	db 5
  3338                                  ;	db 19
  3339                                  
  3340                                  ; 06/11/2014
  3341                                  ; Memory Information message
  3342                                  ; 14/08/2015
  3343                                  msg_memory_info:
  3344 00014407 07                      	db	07h
  3345 00014408 0D0A                    	db	0Dh, 0Ah
  3346                                  	;db 	"MEMORY ALLOCATION INFO", 0Dh, 0Ah, 0Dh, 0Ah
  3347 0001440A 546F74616C206D656D-     	db	"Total memory : "
  3347 00014413 6F7279203A20       
  3348                                  mem_total_b_str: ; 10 digits
  3349 00014419 303030303030303030-     	db	"0000000000 bytes", 0Dh, 0Ah
  3349 00014422 302062797465730D0A 
  3350 0001442B 202020202020202020-     	db	"               ", 20h, 20h, 20h
  3350 00014434 202020202020202020 
  3351                                  mem_total_p_str: ; 7 digits
  3352 0001443D 303030303030302070-     	db	"0000000 pages", 0Dh, 0Ah
  3352 00014446 616765730D0A       
  3353 0001444C 0D0A                    	db 	0Dh, 0Ah
  3354 0001444E 46726565206D656D6F-     	db	"Free memory  : "
  3354 00014457 727920203A20       
  3355                                  free_mem_b_str:  ; 10 digits
  3356 0001445D 3F3F3F3F3F3F3F3F3F-     	db	"?????????? bytes", 0Dh, 0Ah
  3356 00014466 3F2062797465730D0A 
  3357 0001446F 202020202020202020-     	db	"               ", 20h, 20h, 20h
  3357 00014478 202020202020202020 
  3358                                  free_mem_p_str:  ; 7 digits
  3359 00014481 3F3F3F3F3F3F3F2070-     	db	"??????? pages", 0Dh, 0Ah
  3359 0001448A 616765730D0A       
  3360 00014490 0D0A00                  	db	0Dh, 0Ah, 0
  3361                                  
  3362                                  dsk_ready_msg:
  3363 00014493 0D0A                    	db 	0Dh, 0Ah
  3364                                  dsktype:
  3365 00014495 6664                    	db	'fd'
  3366                                  dskx:
  3367 00014497 30                      	db	'0'
  3368 00014498 20                      	db	20h
  3369 00014499 697320524541445920-     	db 	'is READY ...'
  3369 000144A2 2E2E2E             
  3370 000144A5 00                      	db 	0
  3371                                  
  3372                                  setup_error_msg:
  3373 000144A6 0D0A                    	db 0Dh, 0Ah
  3374 000144A8 4469736B2053657475-     	db 'Disk Setup Error !' 
  3374 000144B1 70204572726F722021 
  3375 000144BA 0D0A00                  	db 0Dh, 0Ah,0
  3376                                  
  3377                                  next2line: ; 08/02/2016
  3378 000144BD 0D0A                    	db	0Dh, 0Ah
  3379                                  nextline:
  3380 000144BF 0D0A00                  	db 	0Dh, 0Ah, 0
  3381                                  
  3382                                  ; temporary
  3383                                  ; 19/12/2020
  3384                                  msg_lfb_addr:
  3385                                  	;db	0Dh, 0Ah
  3386 000144C2 4C696E656172206672-     	db	"Linear frame buffer at "
  3386 000144CB 616D65206275666665-
  3386 000144D4 7220617420         
  3387                                  lfb_addr_str: ; 8 (hex) digits
  3388 000144D9 303030303030303068-     	db	"00000000h", 0Dh, 0Ah
  3388 000144E2 0D0A               
  3389 000144E4 0D0A00                  	db	0Dh, 0Ah, 0
  3390                                  
  3391                                  ; KERNEL - SYSINIT Messages
  3392                                  ; 24/08/2015
  3393                                  ; 13/04/2015 - (Retro UNIX 386 v1 Beginning)
  3394                                  ; 14/07/2013
  3395                                  ;kernel_init_err_msg:
  3396                                  ;	db 0Dh, 0Ah
  3397                                  ;	db 07h
  3398                                  ;	db 'Kernel initialization ERROR !'
  3399                                  ;	db 0Dh, 0Ah, 0 
  3400                                  
  3401                                  ;welcome_msg: 
  3402                                  ;	db 0Dh, 0Ah
  3403                                  ;	db 07h
  3404                                  ;	db 'Welcome to TRDOS 386 Operating System !'
  3405                                  ;	db 0Dh, 0Ah
  3406                                  ;	db 'by Erdogan Tan - 31/12/2017 (v2.0.0)'
  3407                                  ;	db 0Dh, 0Ah, 0
  3408                                  
  3409                                  panic_msg:
  3410 000144E7 0D0A07                  	db 0Dh, 0Ah, 07h
  3411 000144EA 4552524F523A204B65-     	db 'ERROR: Kernel Panic !'
  3411 000144F3 726E656C2050616E69-
  3411 000144FC 632021             
  3412 000144FF 0D0A00                  	db 0Dh, 0Ah, 0
  3413                                  
  3414                                  ;msgl_drv_not_ready: 
  3415                                  ;	db 07h, 0Dh, 0Ah
  3416                                  ;       db 'Drive not ready or read error !'
  3417                                  ;       db 0Dh, 0Ah, 0
  3418                                  
  3419                                  starting_msg:
  3420 00014502 5475726B6973682052-     	db "Turkish Rational DOS v2.0 [24/01/2021] ...", 0
  3420 0001450B 6174696F6E616C2044-
  3420 00014514 4F532076322E30205B-
  3420 0001451D 32342F30312F323032-
  3420 00014526 315D202E2E2E00     
  3421                                  NextLine:
  3422 0001452D 0D0A00                  	db 0Dh, 0Ah, 0
  3423                                  
  3424                                  %include 'audio.s' ; 03/04/2017
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.2 - audio.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 01/09/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 03/04/2017
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ****************************************************************************
    10                              <1> 
    11                              <1> ; AUDIO CONTROLLER & CODEC DEFINITIONS & CODE FOR TRDOS 386
    12                              <1> 
    13                              <1> ;=============================================================================
    14                              <1> ;               EQUATES
    15                              <1> ;=============================================================================
    16                              <1> 
    17                              <1> ; PCI EQUATES
    18                              <1> 
    19                              <1> BIT0  EQU 1
    20                              <1> BIT1  EQU 2
    21                              <1> BIT2  EQU 4
    22                              <1> BIT3  EQU 8
    23                              <1> BIT4  EQU 10h
    24                              <1> BIT5  EQU 20h
    25                              <1> BIT6  EQU 40h
    26                              <1> BIT7  EQU 80h
    27                              <1> BIT8  EQU 100h
    28                              <1> BIT9  EQU 200h
    29                              <1> BIT10 EQU 400h
    30                              <1> BIT11 EQU 800h
    31                              <1> BIT12 EQU 1000h
    32                              <1> BIT13 EQU 2000h
    33                              <1> BIT14 EQU 4000h
    34                              <1> BIT15 EQU 8000h
    35                              <1> BIT16 EQU 10000h
    36                              <1> BIT17 EQU 20000h
    37                              <1> BIT18 EQU 40000h
    38                              <1> BIT19 EQU 80000h
    39                              <1> BIT20 EQU 100000h
    40                              <1> BIT21 EQU 200000h
    41                              <1> BIT22 EQU 400000h
    42                              <1> BIT23 EQU 800000h
    43                              <1> BIT24 EQU 1000000h
    44                              <1> BIT25 EQU 2000000h
    45                              <1> BIT26 EQU 4000000h
    46                              <1> BIT27 EQU 8000000h
    47                              <1> BIT28 EQU 10000000h
    48                              <1> BIT29 EQU 20000000h
    49                              <1> BIT30 EQU 40000000h
    50                              <1> BIT31 EQU 80000000h
    51                              <1> NOT_BIT31 EQU 7FFFFFFFh
    52                              <1> 
    53                              <1> ; PCI equates
    54                              <1> ; PCI function address (PFA)
    55                              <1> ; bit 31 = 1
    56                              <1> ; bit 23:16 = bus number     (0-255)
    57                              <1> ; bit 15:11 = device number  (0-31)
    58                              <1> ; bit 10:8 = function number (0-7)
    59                              <1> ; bit 7:0 = register number  (0-255)
    60                              <1> 
    61                              <1> IO_ADDR_MASK    EQU     0FFFEh	; mask off bit 0 for reading BARs
    62                              <1> PCI_INDEX_PORT  EQU     0CF8h
    63                              <1> PCI_DATA_PORT   EQU     0CFCh
    64                              <1> PCI32           EQU     BIT31	; bitflag to signal 32bit access
    65                              <1> PCI16           EQU     BIT30	; bitflag for 16bit access
    66                              <1> NOT_PCI32_PCI16	EQU	03FFFFFFFh ; NOT BIT31+BIT30 ; 19/03/2017
    67                              <1> 
    68                              <1> PCI_FN0         EQU     0 << 8
    69                              <1> PCI_FN1         EQU     1 << 8
    70                              <1> PCI_FN2         EQU     2 << 8
    71                              <1> PCI_FN3         EQU     3 << 8
    72                              <1> PCI_FN4         EQU     4 << 8
    73                              <1> PCI_FN5         EQU     5 << 8
    74                              <1> PCI_FN6         EQU     6 << 8
    75                              <1> PCI_FN7         EQU     7 << 8
    76                              <1> 
    77                              <1> PCI_CMD_REG	EQU	04h	; reg 04, command reg
    78                              <1> IO_ENA		EQU	BIT0	; i/o decode enable
    79                              <1> MEM_ENA		EQU	BIT1	; memory decode enable
    80                              <1> BM_ENA		EQU     BIT2	; bus master enable
    81                              <1> 
    82                              <1> ; VIA VT8233 EQUATES
    83                              <1> 
    84                              <1> VIA_VID		equ 1106h	; VIA's PCI vendor ID
    85                              <1> VT8233_DID      equ 3059h	; VT8233 (VT8235) device ID
    86                              <1> 		
    87                              <1> PCI_IO_BASE          equ 10h
    88                              <1> AC97_INT_LINE        equ 3Ch
    89                              <1> VIA_ACLINK_CTRL      equ 41h
    90                              <1> VIA_ACLINK_STAT      equ 40h
    91                              <1> VIA_ACLINK_C00_READY equ 01h ; primary codec ready
    92                              <1> 	
    93                              <1> VIA_REG_AC97	     equ 80h ; dword
    94                              <1> 
    95                              <1> VIA_ACLINK_CTRL_ENABLE	equ   80h ; 0: disable, 1: enable
    96                              <1> VIA_ACLINK_CTRL_RESET	equ   40h ; 0: assert, 1: de-assert
    97                              <1> VIA_ACLINK_CTRL_SYNC	equ   20h ; 0: release SYNC, 1: force SYNC hi
    98                              <1> VIA_ACLINK_CTRL_VRA	equ   08h ; 0: disable VRA, 1: enable VRA
    99                              <1> VIA_ACLINK_CTRL_PCM	equ   04h ; 0: disable PCM, 1: enable PCM
   100                              <1> 					; 3D Audio Channel slots 3/4
   104                              <1> VIA_ACLINK_CTRL_INIT	equ  (VIA_ACLINK_CTRL_ENABLE +                               VIA_ACLINK_CTRL_RESET +                               VIA_ACLINK_CTRL_PCM +                               VIA_ACLINK_CTRL_VRA)
   105                              <1> 
   106                              <1> CODEC_AUX_VOL		equ   04h
   107                              <1> VIA_REG_AC97_BUSY	equ   01000000h ;(1<<24) 
   108                              <1> VIA_REG_AC97_CMD_SHIFT	equ   10h ; 16
   109                              <1> VIA_REG_AC97_PRIMARY_VALID equ 02000000h ;(1<<25)
   110                              <1> VIA_REG_AC97_READ	equ   00800000h ;(1<<23)
   111                              <1> VIA_REG_AC97_CODEC_ID_SHIFT   equ  1Eh ; 30
   112                              <1> VIA_REG_AC97_CODEC_ID_PRIMARY equ  0
   113                              <1> VIA_REG_AC97_DATA_SHIFT equ   0
   114                              <1> VIADEV_PLAYBACK         equ   0
   115                              <1> VIA_REG_OFFSET_STATUS   equ   0    ;; byte - channel status
   116                              <1> VIA_REG_OFFSET_CONTROL  equ   01h  ;; byte - channel control
   117                              <1> VIA_REG_CTRL_START	equ   80h  ;; WO
   118                              <1> VIA_REG_CTRL_TERMINATE  equ   40h  ;; WO
   119                              <1> VIA_REG_CTRL_PAUSE      equ   08h  ;; RW
   120                              <1> VIA_REG_CTRL_RESET      equ   01h  ;; RW - probably reset? undocumented
   121                              <1> VIA_REG_OFFSET_STOP_IDX equ   08h  ;; dword - stop index, channel type, sample rate
   122                              <1> VIA8233_REG_TYPE_16BIT  equ   200000h ;; RW
   123                              <1> VIA8233_REG_TYPE_STEREO equ   100000h ;; RW
   124                              <1> VIA_REG_OFFSET_CURR_INDEX equ 0Fh ;; byte - channel current index (for via8233 only)
   125                              <1> VIA_REG_OFFSET_TABLE_PTR equ  04h  ;; dword - channel table pointer
   126                              <1> VIA_REG_OFFSET_CURR_PTR equ   04h  ;; dword - channel current pointer
   127                              <1> VIA_REG_OFS_PLAYBACK_VOLUME_L equ  02h ;; byte
   128                              <1> VIA_REG_OFS_PLAYBACK_VOLUME_R equ  03h ;; byte
   129                              <1> VIA_REG_CTRL_AUTOSTART	equ   20h
   130                              <1> VIA_REG_CTRL_INT_EOL	equ   02h
   131                              <1> VIA_REG_CTRL_INT_FLAG	equ   01h
   134                              <1> VIA_REG_CTRL_INT	equ  (VIA_REG_CTRL_INT_FLAG +                               VIA_REG_CTRL_INT_EOL +                               VIA_REG_CTRL_AUTOSTART)
   135                              <1> 
   136                              <1> VIA_REG_STAT_STOP_IDX	equ   10h    ;; RO ; 27/07/2020
   137                              <1> 				     ; current index = stop index
   138                              <1> VIA_REG_STAT_STOPPED	equ   04h    ;; RWC
   139                              <1> VIA_REG_STAT_EOL	equ   02h    ;; RWC
   140                              <1> VIA_REG_STAT_FLAG	equ   01h    ;; RWC
   141                              <1> VIA_REG_STAT_ACTIVE	equ   80h    ;; RO
   142                              <1> ; 28/11/2016
   143                              <1> VIA_REG_STAT_LAST	equ   40h    ;; RO
   144                              <1> VIA_REG_STAT_TRIGGER_QUEUED equ 08h  ;; RO
   145                              <1> VIA_REG_CTRL_INT_STOP	equ   04h  ; Interrupt on Current Index = Stop Index
   146                              <1> 		   		   ; and End of Block
   147                              <1> 
   148                              <1> VIA_REG_OFFSET_CURR_COUNT equ 0Ch ;; dword - channel current count, index
   149                              <1> 
   150                              <1> PORTB		EQU	061h
   151                              <1> REFRESH_STATUS	EQU	010h	; Refresh signal status
   152                              <1> 
   153                              <1> ; AC97 Codec registers.
   154                              <1> 
   155                              <1> ; 22/07/2020
   156                              <1> ; REALTEK ALC655 and ADI SOUNDMAX AD1980 CODEC MIXER REGISTERS
   157                              <1> 
   158                              <1> ; each codec/mixer register is 16bits
   159                              <1> 
   160                              <1> CODEC_RESET_REG                 equ     00h	; reset codec
   161                              <1> CODEC_MASTER_VOL_REG            equ     02h	; master volume
   162                              <1> CODEC_HP_VOL_REG                equ     04h	; headphone volume ; AD1980
   163                              <1> CODEC_MASTER_MONO_VOL_REG       equ     06h	; master mono volume (mono-out)
   164                              <1> ;CODEC_MASTER_TONE_REG          equ     08h	; master tone (R+L) ; (not used)
   165                              <1> CODEC_PCBEEP_VOL_REG            equ     0Ah	; PC beep volume ; ALC655
   166                              <1> CODEC_PHONE_VOL_REG             equ     0Ch	; phone volume
   167                              <1> CODEC_MIC_VOL_REG               equ     0Eh	; mic volume
   168                              <1> CODEC_LINE_IN_VOL_REG           equ     10h	; line in volume
   169                              <1> CODEC_CD_VOL_REG                equ     12h	; CD volume
   170                              <1> ;CODEC_VID_VOL_REG              equ     14h	; video volume ; (not used)
   171                              <1> CODEC_AUX_VOL_REG               equ     16h	; aux volume
   172                              <1> CODEC_PCM_OUT_REG               equ     18h	; PCM out volume
   173                              <1> CODEC_RECORD_SELECT_REG         equ     1Ah	; record select
   174                              <1> CODEC_RECORD_VOL_REG            equ     1Ch	; record volume (record gain)
   175                              <1> ;CODEC_RECORD_MIC_VOL_REG       equ     1Eh	; record mic volume ; (not used)
   176                              <1> CODEC_GP_REG                    equ     20h	; general purpose
   177                              <1> ;CODEC_3D_CONTROL_REG           equ     22h	; 3D control
   178                              <1> ;;CODEC_AUDIO_INT_PAGING_REG    equ	24h	; audio int & paging ; (not used) 
   179                              <1> CODEC_POWER_CTRL_REG            equ     26h	; power down control
   180                              <1> CODEC_EXT_AUDIO_REG             equ     28h	; extended audio ID
   181                              <1> CODEC_EXT_AUDIO_CTRL_REG        equ     2Ah	; extended audio status/control
   182                              <1> CODEC_PCM_FRONT_DACRATE_REG     equ     2Ch	; PCM front sample rate
   183                              <1> CODEC_PCM_SURND_DACRATE_REG     equ     2Eh	; PCM surround sample rate
   184                              <1> CODEC_PCM_LFE_DACRATE_REG       equ     30h	; PCM Center/LFE sample rate
   185                              <1> CODEC_LR_ADCRATE_REG            equ     32h	; PCM input sample rate
   186                              <1> CODEC_MIC_ADCRATE_REG           equ     34h	; mic in sample rate  ; AD1980
   187                              <1> CODEC_PCM_LFE_VOL_REG           equ     36h	; PCM Center/LFE volume
   188                              <1> CODEC_PCM_SURND_VOL_REG         equ     38h	; PCM surround volume
   189                              <1> ;CODEC_SPDIF_CTRL_REG           equ     3Ah	; S/PDIF control
   190                              <1> ; 22/07/2020
   191                              <1> CODEC_MISC_CRTL_BITS_REG	equ	76h	; misc control bits ; AD1980
   192                              <1> ;	
   193                              <1> CODEC_VENDOR_ID1		equ	7Ch	; REALTEK: 414Ch, ADI: 4144h	
   194                              <1> CODEC_VENDOR_ID2		equ	7Eh	; REALTEK: 4760h, ADI: 5370h	
   195                              <1> 
   196                              <1> ; VT8233 SGD bits (21/04/2017)
   197                              <1> FLAG	EQU BIT30
   198                              <1> EOL	EQU BIT31
   199                              <1> 
   200                              <1> ; INTEL ICH EQUATES
   201                              <1> ; 28/05/2017
   202                              <1> INTEL_VID	equ	8086h	; Intel's PCI vendor ID
   203                              <1> ICH_DID		equ	2415h	; ICH (82801AA) device ID
   204                              <1> NAMBAR_REG      equ	10h	; native audio mixer Base Address Register
   205                              <1> NABMBAR_REG     equ	14h	; native audio bus mastering Base Addr Reg
   206                              <1> 
   207                              <1> PI_CR_REG       equ     0Bh     ; PCM in Control Register
   208                              <1> PO_CR_REG	equ     1Bh     ; PCM out Control Register
   209                              <1> MC_CR_REG	equ     2Bh     ; MIC in Control Register
   210                              <1> 
   211                              <1> PI_SR_REG	equ     6       ; PCM in Status register
   212                              <1> PO_SR_REG	equ     16h     ; PCM out Status register
   213                              <1> MC_SR_REG	equ     26h     ; MIC in Status register
   214                              <1> 
   215                              <1> IOCE 		equ     BIT4    ; interrupt on complete enable.
   216                              <1> FEIFE		equ     BIT3    ; set if you want an interrupt to fire
   217                              <1> LVBIE		equ     BIT2    ; last valid buffer interrupt enable.
   218                              <1> RR 		equ     BIT1    ; reset registers. Nukes all regs
   219                              <1>                                 ; except bits 4:2 of this register.
   220                              <1>                                 ; Only set this bit if BIT 0 is 0
   221                              <1> RPBM		equ     BIT0    ; Run/Pause
   222                              <1> 				; set this bit to start the codec!
   223                              <1> 
   224                              <1> PI_BDBAR_REG	equ     0       ; PCM in buffer descriptor BAR
   225                              <1> PO_BDBAR_REG	equ     10h     ; PCM out buffer descriptor BAR
   226                              <1> MC_BDBAR_REG	equ     20h     ; MIC in buffer descriptor BAR
   227                              <1> 
   228                              <1> PI_CIV_REG	equ     4       ; PCM in current Index value (RO)
   229                              <1> PO_CIV_REG	equ     14h     ; PCM out current Index value (RO)
   230                              <1> MC_CIV_REG 	equ     24h     ; MIC in current Index value (RO)
   231                              <1> 
   232                              <1> PI_LVI_REG	equ     5       ; PCM in Last Valid Index
   233                              <1> PO_LVI_REG	equ     15h     ; PCM out Last Valid Index
   234                              <1> MC_LVI_REG	equ     25h     ; MIC in Last Valid Index
   235                              <1> 
   236                              <1> IOC		equ     BIT31	; Fire an interrupt whenever this
   237                              <1>                 		; buffer is complete.
   238                              <1> BUP		equ     BIT30	; Buffer Underrun Policy.
   239                              <1> 
   240                              <1> GLOB_CNT_REG	equ     2Ch     ; Global Control Register
   241                              <1> GLOB_STS_REG	equ     30h     ; Global Status register (RO)
   242                              <1> 
   243                              <1> CTRL_ST_CREADY	equ   BIT8+BIT9+BIT28 ; Primary Codec Ready
   244                              <1> 
   245                              <1> CODEC_REG_POWERDOWN   equ 26h
   246                              <1> CODEC_REG_ST          equ 26h
   247                              <1> 
   248                              <1> ; 22/06/2017
   249                              <1> PO_PICB_REG	equ 18h	; PCM Out Position In Current Buffer Register
   250                              <1> 
   251                              <1> ;=============================================================================
   252                              <1> ;               CODE
   253                              <1> ;=============================================================================
   254                              <1> 
   255                              <1> ; CODE for INTEL ICH AC'97 AUDIO CONTROLLER
   256                              <1> 
   257                              <1> DetectICH:
   258                              <1> 	; 10/06/2017
   259                              <1> 	; 05/06/2017
   260                              <1> 	; 29/05/2017
   261                              <1> 	; 28/05/2017
   262 00014530 B886801524          <1> 	mov     eax, (ICH_DID << 16) + INTEL_VID
   263 00014535 E876000000          <1>         call    pciFindDevice
   264 0001453A 730D                <1>         jnc     short d_ac97_1
   265                              <1> d_ac97_0:
   266                              <1> ; couldn't find the audio device!
   267 0001453C C3                  <1> 	retn
   268                              <1> 
   269                              <1> ; CODE for VIA VT8233 AUDIO CONTROLLER
   270                              <1> 
   271                              <1> DetectVT8233:
   272                              <1> 	; 10/06/2017
   273                              <1> 	; 05/06/2017
   274                              <1> 	; 29/05/2017
   275                              <1> 	; 03/04/2017
   276 0001453D B806115930          <1> 	mov     eax, (VT8233_DID << 16) + VIA_VID
   277 00014542 E869000000          <1>         call    pciFindDevice
   278                              <1> ;       jnc     short d_vt8233_0
   279                              <1> ; couldn't find the audio device!
   280                              <1> ;	retn
   281 00014547 72F3                <1> 	jc	short d_ac97_0  ; 28/05/2017
   282                              <1> d_vt8233_0:
   283                              <1> 	; 24/03/2017 ('player.asm')
   284                              <1> 	; 12/11/2016 
   285                              <1> 	; Erdogan Tan - 8/11/2016
   286                              <1> 	; References: Kolibrios - vt823x.asm (2016)
   287                              <1> 	;	      VIA VT8235 V-Link South Bridge (VT8235-VIA.PDF)(2002)
   288                              <1> 	;	      lowlevel.eu - AC97 (2016)
   289                              <1> 	;	      .wav player for DOS by Jeff Leyda (2002) -this file-
   290                              <1> 	;	      Linux kernel - via82xx.c (2016)
   291                              <1> d_ac97_1:
   292                              <1> 	; eax = BUS/DEV/FN
   293                              <1> 	;	00000000BBBBBBBBDDDDDFFF00000000
   294                              <1> 	; edx = DEV/VENDOR
   295                              <1> 	;	DDDDDDDDDDDDDDDDVVVVVVVVVVVVVVVV
   296                              <1> 
   297 00014549 A3[18940100]        <1> 	mov	[audio_dev_id], eax
   298 0001454E 8915[1C940100]      <1> 	mov	[audio_vendor], edx
   299                              <1> 
   300                              <1> 	; init controller
   301 00014554 B004                <1> 	mov	al, PCI_CMD_REG ; command register (04h)
   302 00014556 E8E2000000          <1> 	call	pciRegRead32
   303                              <1> 
   304                              <1> 	; eax = BUS/DEV/FN/REG
   305                              <1> 	; edx = STATUS/COMMAND
   306                              <1> 	; 	SSSSSSSSSSSSSSSSCCCCCCCCCCCCCCCC
   307 0001455B 8915[20940100]      <1> 	mov	[audio_stats_cmd], edx
   308                              <1> 
   309 00014561 B010                <1> 	mov	al, PCI_IO_BASE ; IO base address register (10h)
   310                              <1> 	;mov	al, NAMBAR_REG	; Native Audio Mixer BAR (10h)
   311 00014563 E8D5000000          <1> 	call	pciRegRead32
   312                              <1> 
   313 00014568 66813D[1C940100]86- <1> 	cmp	word [audio_vendor], 8086h ; AC'97 ?
   313 00014570 80                  <1>
   314 00014571 751F                <1> 	jne	short d_vt8233_1
   315                              <1> 
   316 00014573 6683E2FE            <1> 	and	dx, 0FFFEh ; Audio Codec IO_ADDR_MASK
   317 00014577 668915[48940100]    <1> 	mov	[NAMBAR], dx
   318                              <1> 
   319 0001457E B014                <1> 	mov	al, NABMBAR_REG ; Native Audio Bus Mastering BAR (14h)
   320 00014580 E8B8000000          <1> 	call	pciRegRead32	
   321                              <1> 
   322 00014585 6683E2C0            <1> 	and	dx, 0FFC0h ; Audio Controller IO_ADDR_MASK
   323 00014589 668915[4A940100]    <1> 	mov	[NABMBAR], dx
   324                              <1>         ;mov	[audio_io_base], dx
   325                              <1> 	
   326 00014590 EB0B                <1> 	jmp	short d_ac97_2
   327                              <1> 
   328                              <1> d_vt8233_1:
   329 00014592 6683E2C0            <1> 	and     dx, 0FFC0h ; Audio Controller IO_ADDR_MASK 
   330 00014596 668915[16940100]    <1>         mov     [audio_io_base], dx
   331                              <1> 
   332                              <1> d_ac97_2:
   333                              <1> 	; 10/06/2017
   334 0001459D B03C                <1> 	mov	al, AC97_INT_LINE ; Interrupt Line Register (3Ch)
   335                              <1> 	;call	pciRegRead32
   336 0001459F E886000000          <1> 	call	pciRegRead8
   337                              <1> 
   338                              <1> 	;and 	edx, 0FFh
   339 000145A4 6681E2FF00          <1> 	and	dx, 0FFh
   340                              <1> 
   341 000145A9 8815[13940100]      <1>   	mov     [audio_intr], dl
   342                              <1> 
   343 000145AF C3                  <1> 	retn
   344                              <1> 
   345                              <1> 	;; (Note: Interrupts are already enabled by TRDOS 386 kernel!)
   346                              <1> 	;mov	cx, dx
   347                              <1> 	
   348                              <1> 	;in	al, 0A1h ; irq 8-15
   349                              <1> 	;mov	ah, al
   350                              <1> 	;in	al, 21h  ; irq 0-7 
   351                              <1> 	;btr	ax, dx	 ; unmask ; 17/03/2017
   352                              <1> 	;;bts	ax, dx   ; MASK interrupt ; 10/06/2017 
   353                              <1> 	;out	21h, al  ; irq <= 7
   354                              <1> 	;mov	al, ah
   355                              <1> 	;out	0A1h, al ; irq > 7
   356                              <1> 	;
   357                              <1> 	
   358                              <1> 	; 10/06/2017
   359                              <1> 	; === Intel ICH I/O Controller Hub Datasheet, Section 8.1.16 ===
   360                              <1> 	; PRQ[n]_ROUT Register (61h, PRQB) Bit 7:
   361                              <1> 	; Interrupt Routing Enable (IRQEN).
   362                              <1> 	; 0 = The corresponding PIRQ is routed to one of the ISA-compatible
   363                              <1> 	;     interrupts specified in bits[3:0].
   364                              <1> 	; 1 = The PIRQ is not routed to the 8259.
   365                              <1> 	; Note: If the PIRQ is intended to cause an interrupt to the ICHs 
   366                              <1> 	;	integrated I/O APIC, then this bit should be set to 0 and 
   367                              <1> 	;	the APIC_EN bit should be set to 1. 
   368                              <1> 	;	The IRQEN must be set to 0 and the PIRQ routed to 
   369                              <1> 	;	an 8259 interrupt via the IRQ Routing filed (bits[3:0).
   370                              <1> 	;	The corresponding 8259 interrupt must be masked via the 
   371                              <1> 	;	appropriated bit in the 8259s OCW1 (Interrupt Mask)
   372                              <1> 	;	register. The IOAPIC must then be enabled by setting 
   373                              <1> 	;	the APIC_EN bit in the GEN_CNTL register.
   374                              <1> 
   375                              <1> 	;mov	eax, 0F861h  ; D31:F0
   376                              <1> 		;AL=61h : PIRQ[B] Routing Control Reg, LPC interface
   377                              <1> 	;;mov	dl, [audio_intr]
   378                              <1> 	;call	pciRegWrite8
   379                              <1> 	;;mov	al, 0D0h ; General Control Register (GEN_CTL)
   380                              <1> 	;;call	pciRegRead32
   381                              <1> 	;;or	edx, 100h ; Bit 8, APIC_EN (Enable I/O APIC) 
   382                              <1> 	;;;call	pciRegWrite32
   383                              <1> 	;;and	edx, ~100h
   384                              <1> 	;;call	pciRegWrite32 ; ; Bit 8, APIC_EN (Disable I/O APIC) 
   385                              <1> 	;
   386                              <1> 
   387                              <1> 	;mov	dx, 4D1h	; 8259 ELCR2
   388                              <1>     	;in	al, dx
   389                              <1> 	;mov	ah, al
   390                              <1> 	;;mov	dx, 4D0h 	; 8259 ELCR1
   391                              <1> 	;dec	dl
   392                              <1> 	;in	al, dx
   393                              <1> 	;bts	ax, cx
   394                              <1> 	;;mov	dx, 4D0h
   395                              <1> 	;out	dx, al		; set level-triggered mode
   396                              <1> 	;mov	al, ah ; 29/05/2017
   397                              <1> 	;;mov	dx, 4D1h
   398                              <1> 	;inc	dl
   399                              <1> 	;out	dx, al		; set level-triggered mode
   400                              <1> 
   401                              <1> 	;xor	eax, eax ; 0
   402                              <1> 
   403                              <1> 	;retn
   404                              <1> 
   405                              <1> ; CODE for PCI
   406                              <1> 
   407                              <1> pciFindDevice:
   408                              <1> 	; 03/04/2017 ('pci.asm', 20/03/2017)
   409                              <1> 	;
   410                              <1> 	; scan through PCI space looking for a device+vendor ID
   411                              <1> 	;
   412                              <1> 	; Entry: EAX=Device+Vendor ID
   413                              <1> 	;
   414                              <1> 	; Exit: EAX=PCI address if device found
   415                              <1> 	;	 EDX=Device+Vendor ID
   416                              <1> 	;        CY clear if found, set if not found. EAX invalid if CY set.
   417                              <1> 	;
   418                              <1> 	; Destroys: ebx, esi, edi, cl
   419                              <1> 	;
   420                              <1> 
   421                              <1> 	;push	ecx
   422 000145B0 50                  <1> 	push	eax
   423                              <1> 	;push	esi
   424                              <1> 	;push	edi
   425                              <1> 
   426 000145B1 89C6                <1>         mov     esi, eax                ; save off vend+device ID
   427 000145B3 BF00FFFF7F          <1>         mov     edi, (80000000h - 100h) ; start with bus 0, dev 0 func 0
   428                              <1> 
   429                              <1> nextPCIdevice:
   430 000145B8 81C700010000        <1>         add     edi, 100h
   431 000145BE 81FF00F8FF80        <1>         cmp     edi, 80FFF800h		; scanned all devices?
   432 000145C4 F9                  <1>         stc
   433 000145C5 740C                <1>         je      short PCIScanExit       ; not found
   434                              <1> 
   435 000145C7 89F8                <1>         mov     eax, edi                ; read PCI registers
   436 000145C9 E86F000000          <1>         call    pciRegRead32
   437 000145CE 39F2                <1>         cmp     edx, esi                ; found device?
   438 000145D0 75E6                <1>         jne     short nextPCIdevice
   439 000145D2 F8                  <1>         clc
   440                              <1> 
   441                              <1> PCIScanExit:
   442 000145D3 9C                  <1> 	pushf
   443 000145D4 B8FFFFFF7F          <1> 	mov	eax, NOT_BIT31 	; 19/03/2017
   444 000145D9 21F8                <1> 	and	eax, edi	; return only bus/dev/fn #
   445 000145DB 9D                  <1> 	popf
   446                              <1> 
   447                              <1> 	;pop	edi
   448                              <1> 	;pop	esi
   449 000145DC 5A                  <1> 	pop	edx
   450                              <1> 	;pop	ecx
   451 000145DD C3                  <1> 	retn
   452                              <1> 
   453                              <1> pciRegRead:
   454                              <1> 	; 03/04/2017 ('pci.asm', 20/03/2017)
   455                              <1> 	;
   456                              <1> 	; 8/16/32bit PCI reader
   457                              <1> 	;
   458                              <1> 	; Entry: EAX=PCI Bus/Device/fn/register number
   459                              <1> 	;           BIT30 set if 32 bit access requested
   460                              <1> 	;           BIT29 set if 16 bit access requested
   461                              <1> 	;           otherwise defaults to 8 bit read
   462                              <1> 	;
   463                              <1> 	; Exit:  DL,DX,EDX register data depending on requested read size
   464                              <1> 	;
   465                              <1> 	; Note1: this routine is meant to be called via pciRegRead8,
   466                              <1> 	;	 pciRegread16 or pciRegRead32, listed below.
   467                              <1> 	;
   468                              <1> 	; Note2: don't attempt to read 32 bits of data from a non dword
   469                              <1> 	;	 aligned reg number. Likewise, don't do 16 bit reads from
   470                              <1> 	;	 non word aligned reg #
   471                              <1> 	
   472 000145DE 53                  <1> 	push	ebx
   473 000145DF 51                  <1> 	push	ecx
   474 000145E0 89C3                <1>         mov     ebx, eax		; save eax, dh
   475 000145E2 88F1                <1>         mov     cl, dh
   476                              <1> 
   477 000145E4 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; clear out data size request
   478 000145E9 0D00000080          <1>         or      eax, BIT31		; make a PCI access request
   479 000145EE 24FC                <1>         and     al, ~3 ; NOT 3		; force index to be dword
   480                              <1> 
   481 000145F0 66BAF80C            <1>         mov     dx, PCI_INDEX_PORT
   482 000145F4 EF                  <1>         out	dx, eax			; write PCI selector
   483                              <1> 	
   484 000145F5 66BAFC0C            <1>         mov     dx, PCI_DATA_PORT
   485 000145F9 88D8                <1>         mov     al, bl
   486 000145FB 2403                <1>         and     al, 3			; figure out which port to
   487 000145FD 00C2                <1>         add     dl, al			; read to
   488                              <1> 
   489 000145FF F7C3000000C0        <1> 	test    ebx, PCI32+PCI16
   490 00014605 7507                <1>         jnz     short _pregr0
   491 00014607 EC                  <1> 	in	al, dx			; return 8 bits of data
   492 00014608 88C2                <1>         mov	dl, al
   493 0001460A 88CE                <1> 	mov     dh, cl			; restore dh for 8 bit read
   494 0001460C EB12                <1> 	jmp	short _pregr2
   495                              <1> _pregr0:	
   496 0001460E F7C300000080        <1> 	test    ebx, PCI32
   497 00014614 7507                <1>         jnz	short _pregr1
   498 00014616 66ED                <1> 	in	ax, dx
   499 00014618 6689C2              <1>         mov     dx, ax			; return 16 bits of data
   500 0001461B EB03                <1> 	jmp	short _pregr2
   501                              <1> _pregr1:
   502 0001461D ED                  <1> 	in	eax, dx			; return 32 bits of data
   503 0001461E 89C2                <1> 	mov	edx, eax
   504                              <1> _pregr2:
   505 00014620 89D8                <1> 	mov     eax, ebx		; restore eax
   506 00014622 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; clear out data size request
   507 00014627 59                  <1> 	pop	ecx
   508 00014628 5B                  <1> 	pop	ebx
   509 00014629 C3                  <1> 	retn
   510                              <1> 
   511                              <1> pciRegRead8:
   512 0001462A 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 8 bit read size
   513 0001462F EBAD                <1>         jmp     short pciRegRead	; call generic PCI access
   514                              <1> 
   515                              <1> pciRegRead16:
   516 00014631 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 16 bit read size
   517 00014636 0D00000040          <1>         or      eax, PCI16		; call generic PCI access
   518 0001463B EBA1                <1>         jmp     short pciRegRead
   519                              <1> 
   520                              <1> pciRegRead32:
   521 0001463D 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 32 bit read size
   522 00014642 0D00000080          <1>         or      eax, PCI32		; call generic PCI access
   523 00014647 EB95                <1>         jmp     pciRegRead
   524                              <1> 
   525                              <1> pciRegWrite:
   526                              <1> 	; 03/04/2017 ('pci.asm', 29/11/2016)
   527                              <1> 	;
   528                              <1> 	; 8/16/32bit PCI writer
   529                              <1> 	;
   530                              <1> 	; Entry: EAX=PCI Bus/Device/fn/register number
   531                              <1> 	;           BIT31 set if 32 bit access requested
   532                              <1> 	;           BIT30 set if 16 bit access requested
   533                              <1> 	;           otherwise defaults to 8bit read
   534                              <1> 	;        DL/DX/EDX data to write depending on size
   535                              <1> 	;
   536                              <1> 	; Note1: this routine is meant to be called via pciRegWrite8, 
   537                              <1> 	;	 pciRegWrite16 or pciRegWrite32 as detailed below.
   538                              <1> 	;
   539                              <1> 	; Note2: don't attempt to write 32bits of data from a non dword
   540                              <1> 	;	 aligned reg number. Likewise, don't do 16 bit writes from
   541                              <1> 	;	 non word aligned reg #
   542                              <1> 
   543 00014649 53                  <1> 	push	ebx
   544 0001464A 51                  <1> 	push	ecx
   545 0001464B 89C3                <1>         mov     ebx, eax		; save eax, edx
   546 0001464D 89D1                <1>         mov     ecx, edx
   547 0001464F 25FFFFFF3F          <1> 	and     eax, NOT_PCI32_PCI16	; clear out data size request
   548 00014654 0D00000080          <1>         or      eax, BIT31		; make a PCI access request
   549 00014659 24FC                <1>         and     al, ~3 ; NOT 3		; force index to be dword
   550                              <1> 
   551 0001465B 66BAF80C            <1>         mov     dx, PCI_INDEX_PORT
   552 0001465F EF                  <1>         out	dx, eax			; write PCI selector
   553                              <1> 	
   554 00014660 66BAFC0C            <1>         mov     dx, PCI_DATA_PORT
   555 00014664 88D8                <1>         mov     al, bl
   556 00014666 2403                <1>         and     al, 3			; figure out which port to
   557 00014668 00C2                <1>         add     dl, al			; write to
   558                              <1> 
   559 0001466A F7C3000000C0        <1> 	test    ebx, PCI32+PCI16
   560 00014670 7505                <1>         jnz     short _pregw0
   561 00014672 88C8                <1> 	mov	al, cl 			; put data into al
   562 00014674 EE                  <1> 	out	dx, al
   563 00014675 EB12                <1> 	jmp	short _pregw2
   564                              <1> _pregw0:
   565 00014677 F7C300000080        <1> 	test    ebx, PCI32
   566 0001467D 7507                <1>         jnz     short _pregw1
   567 0001467F 6689C8              <1> 	mov	ax, cx			; put data into ax
   568 00014682 66EF                <1> 	out	dx, ax
   569 00014684 EB03                <1> 	jmp	short _pregw2
   570                              <1> _pregw1:
   571 00014686 89C8                <1> 	mov	eax, ecx		; put data into eax 		
   572 00014688 EF                  <1> 	out	dx, eax
   573                              <1> _pregw2:
   574 00014689 89D8                <1>         mov     eax, ebx		; restore eax
   575 0001468B 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; clear out data size request
   576 00014690 89CA                <1>         mov     edx, ecx		; restore dx
   577 00014692 59                  <1> 	pop	ecx
   578 00014693 5B                  <1> 	pop	ebx
   579 00014694 C3                  <1> 	retn
   580                              <1> 
   581                              <1> pciRegWrite8:
   582 00014695 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 8 bit write size
   583 0001469A EBAD                <1>         jmp	short pciRegWrite	; call generic PCI access
   584                              <1> 
   585                              <1> pciRegWrite16:
   586 0001469C 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 16 bit write size
   587 000146A1 0D00000040          <1>         or      eax, PCI16		; call generic PCI access
   588 000146A6 EBA1                <1>         jmp	short pciRegWrite
   589                              <1> 
   590                              <1> pciRegWrite32:
   591 000146A8 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 32 bit write size
   592 000146AD 0D00000080          <1>         or      eax, PCI32		; call generic PCI access
   593 000146B2 EB95                <1>         jmp	pciRegWrite
   594                              <1> 
   595                              <1> init_codec:
   596                              <1> 	; 05/06/2017
   597                              <1> 	; 28/05/2017 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   598                              <1> 	;
   599 000146B4 A1[18940100]        <1> 	mov	eax, [audio_dev_id]	
   600 000146B9 B041                <1> 	mov	al, VIA_ACLINK_CTRL
   601 000146BB E86AFFFFFF          <1> 	call	pciRegRead8
   602                              <1> 	; ?
   603 000146C0 B040                <1> 	mov	al, VIA_ACLINK_STAT
   604 000146C2 E863FFFFFF          <1> 	call	pciRegRead8
   605 000146C7 F6C201              <1> 	test	dl, VIA_ACLINK_C00_READY
   606 000146CA 7508                <1>         jnz     short _codec_ready_1
   607 000146CC E80E000000          <1> 	call	reset_codec
   608 000146D1 7306                <1> 	jnc	short _codec_ready_2 ; eax = 1
   609 000146D3 C3                  <1> 	retn
   610                              <1> _codec_ready_1:
   611 000146D4 B801000000          <1> 	mov	eax, 1
   612                              <1> _codec_ready_2:
   613 000146D9 E886000000          <1> 	call	codec_io_w16
   614                              <1> detect_codec:
   615 000146DE C3                  <1> 	retn
   616                              <1> 
   617                              <1> reset_codec:
   618                              <1> 	; 16/04/2017
   619                              <1> 	; 23/03/2017 
   620                              <1> 	; ('codec.asm')
   621                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   622 000146DF A1[18940100]        <1> 	mov	eax, [audio_dev_id]
   623 000146E4 B041                <1>  	mov	al, VIA_ACLINK_CTRL
   624 000146E6 B2E0                <1>        	mov	dl, VIA_ACLINK_CTRL_ENABLE + VIA_ACLINK_CTRL_RESET + VIA_ACLINK_CTRL_SYNC
   625 000146E8 E8A8FFFFFF          <1> 	call	pciRegWrite8
   626                              <1> 
   627 000146ED E849000000          <1> 	call	delay_100ms 	; wait 100 ms
   628                              <1> _rc_cold:
   629 000146F2 E814000000          <1>         call    cold_reset
   630 000146F7 7301                <1>         jnc     short _reset_codec_ok
   631                              <1> 	
   632                              <1> 	; 16/04/2017
   633                              <1>         ;xor     eax, eax         ; timeout error
   634                              <1>        	;stc
   635 000146F9 C3                  <1> 	retn
   636                              <1> 
   637                              <1> _reset_codec_ok:
   638                              <1> 	; 01/09/2020
   639                              <1> 	; 15/08/2020
   640                              <1> 	; 27/07/2020
   641                              <1> 	; also reset codec by using index control register 0 of AD1980 or ALC655
   642                              <1> 	; (to fix line out -2 channels audio playing- problem on AD1980 codec)  
   643                              <1> 
   644 000146FA 29C0                <1> 	sub	eax, eax
   645 000146FC BA00000000          <1> 	mov	edx, CODEC_RESET_REG ; 00h ; Reset register
   646 00014701 E8CA000000          <1> 	call	codec_write
   647                              <1> 
   648                              <1> 	;sub	eax, eax
   649                              <1> 	; 01/09/2020
   650                              <1> 	; 15/08/2020
   651                              <1> 	; AD1980 BugFix
   652                              <1> 	; (set HPSEL -headphone amp to be driven from mixer- and
   653                              <1> 	;      CLDIS - center and LFE disable- bits)	
   654                              <1> 	;mov	eax, 0C00h ; HPSEL = bit 10, CLDIS = bit 11 ; 01/09/2020
   655                              <1>  	;mov	edx, CODEC_MISC_CRTL_BITS_REG ; 76h ; Misc Ctrl Bits ; AD1980
   656                              <1> 	;call	codec_write
   657                              <1> 
   658 00014706 31C0                <1>         xor     eax, eax
   659                              <1>         ;mov	al, VIA_ACLINK_C00_READY ; 1
   660 00014708 FEC0                <1>         inc	al
   661 0001470A C3                  <1> 	retn
   662                              <1> 
   663                              <1> cold_reset:
   664                              <1> 	; 16/04/2017
   665                              <1> 	; 23/03/2017
   666                              <1> 	; ('codec.asm')
   667                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   668                              <1> 	;mov	eax, [audio_dev_id]
   669                              <1> 	;mov	al, VIA_ACLINK_CTRL
   670 0001470B 30D2                <1> 	xor	dl, dl ; 0
   671 0001470D E883FFFFFF          <1> 	call	pciRegWrite8
   672                              <1> 
   673 00014712 E824000000          <1> 	call	delay_100ms 	; wait 100 ms
   674                              <1> 
   675                              <1> 	;; ACLink on, deassert ACLink reset, VSR, SGD data out
   676                              <1>         ;; note - FM data out has trouble with non VRA codecs !!
   677                              <1>         
   678                              <1> 	;mov	eax, [audio_dev_id]
   679                              <1> 	;mov	al, VIA_ACLINK_CTRL
   680 00014717 B2CC                <1> 	mov	dl, VIA_ACLINK_CTRL_INIT
   681 00014719 E877FFFFFF          <1> 	call	pciRegWrite8
   682                              <1> 
   683 0001471E B910000000          <1> 	mov	ecx, 16	; total 2s
   684                              <1> 
   685                              <1> _crst_wait:
   686                              <1> 	;mov	eax, [audio_dev_id]
   687 00014723 B040                <1> 	mov	al, VIA_ACLINK_STAT
   688 00014725 E800FFFFFF          <1> 	call	pciRegRead8	
   689                              <1> 
   690 0001472A F6C201              <1>         test    dl, VIA_ACLINK_C00_READY
   691 0001472D 750B                <1>         jnz     short _crst_ok
   692                              <1> 
   693 0001472F 51                  <1> 	push	ecx
   694 00014730 E806000000          <1> 	call	delay_100ms
   695 00014735 59                  <1> 	pop	ecx
   696                              <1> 
   697 00014736 49                  <1>         dec     ecx
   698 00014737 75EA                <1>         jnz     short _crst_wait
   699                              <1> 
   700                              <1> _crst_fail:
   701 00014739 F9                  <1>         stc
   702                              <1> _crst_ok:
   703 0001473A C3                  <1> 	retn
   704                              <1> 
   705                              <1> delay_100ms:
   706                              <1> 	; 29/05/2017
   707                              <1> 	; 24/03/2017 ('codec.asm')
   708                              <1> 	; wait 100 ms
   709 0001473B B990010000          <1> 	mov	ecx, 400  ; 400*0.25ms
   710                              <1> _delay_x_ms:
   711 00014740 E803000000          <1> 	call	delay1_4ms
   712 00014745 E2F9                <1>         loop	_delay_x_ms
   713 00014747 C3                  <1> 	retn
   714                              <1> 
   715                              <1> ;       delay1_4ms - Delay for 1/4 millisecond.
   716                              <1> ;	    1mS = 1000us
   717                              <1> ;       Entry:
   718                              <1> ;         None
   719                              <1> ;       Exit:
   720                              <1> ;	  None
   721                              <1> ;
   722                              <1> ;       Modified:
   723                              <1> ;         None
   724                              <1> ;
   725                              <1> 
   726                              <1> 	; 29/05/2017
   727                              <1> 	; 23/04/2017
   728                              <1> 	; 05/03/2017 (TRDOS 386)
   729                              <1> 	; ('UTILS.ASM')
   730                              <1> delay1_4ms:
   731 00014748 50                  <1>         push    eax 
   732 00014749 51                  <1>         push    ecx
   733 0001474A B110                <1>         mov	cl, 16		; close enough.
   734                              <1> 
   735 0001474C E461                <1> 	in	al, PORTB ; 61h
   736                              <1> 		
   737 0001474E 2410                <1> 	and	al, REFRESH_STATUS ; 10h
   738 00014750 88C5                <1> 	mov	ch, al		; Start toggle state
   739                              <1> _d4ms1:	
   740 00014752 E461                <1> 	in	al, PORTB	; Read system control port
   741                              <1> 	
   742 00014754 2410                <1> 	and	al, REFRESH_STATUS ; Refresh toggles 15.085 microseconds
   743 00014756 38C5                <1> 	cmp	ch, al
   744 00014758 74F8                <1> 	je	short _d4ms1	; Wait for state change
   745                              <1> 
   746 0001475A 88C5                <1> 	mov	ch, al		; Update with new state
   747 0001475C FEC9                <1> 	dec	cl
   748 0001475E 75F2                <1> 	jnz	short _d4ms1
   749                              <1> 
   750 00014760 F8                  <1> 	clc	; 29/05/2017
   751                              <1> 
   752 00014761 59                  <1>         pop     ecx
   753 00014762 58                  <1>         pop     eax
   754 00014763 C3                  <1>         retn
   755                              <1> 
   756                              <1> ; 10/04/2017 (TRDOS 386)
   757                              <1> ; 12/11/2016
   758                              <1> 
   759                              <1> codec_io_w16: ;w32
   760                              <1> 	; ('codec.asm')
   761 00014764 668B15[16940100]    <1>         mov	dx, [audio_io_base]
   762 0001476B 6681C28000          <1>         add     dx, VIA_REG_AC97
   763 00014770 EF                  <1> 	out	dx, eax
   764 00014771 C3                  <1>         retn
   765                              <1> 
   766                              <1> codec_io_r16: ;r32
   767                              <1> 	; ('codec.asm')
   768 00014772 668B15[16940100]    <1>         mov     dx, [audio_io_base]
   769 00014779 6681C28000          <1>         add     dx, VIA_REG_AC97
   770 0001477E ED                  <1>         in	eax, dx
   771 0001477F C3                  <1>         retn
   772                              <1> 
   773                              <1> ctrl_io_w8:
   774                              <1> 	; ('codec.asm')
   775 00014780 660315[16940100]    <1>         add     dx, [audio_io_base]
   776 00014787 EE                  <1>         out	dx, al
   777 00014788 C3                  <1>         retn
   778                              <1> 
   779                              <1> ctrl_io_r8:
   780                              <1> 	; ('codec.asm')
   781 00014789 660315[16940100]    <1>         add     dx, [audio_io_base]
   782 00014790 EC                  <1>         in	al, dx
   783 00014791 C3                  <1>         retn
   784                              <1> 
   785                              <1> ctrl_io_w32:
   786                              <1> 	; ('codec.asm')
   787 00014792 660315[16940100]    <1>         add     dx, [audio_io_base]
   788 00014799 EF                  <1>         out	dx, eax
   789 0001479A C3                  <1>         retn
   790                              <1> 
   791                              <1> ctrl_io_r32:
   792                              <1> 	; ('codec.asm')
   793 0001479B 660315[16940100]    <1>         add	dx, [audio_io_base]
   794 000147A2 ED                  <1> 	in	eax, dx
   795 000147A3 C3                  <1>         retn
   796                              <1> 
   797                              <1> codec_read:
   798                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   799                              <1>         ; Use only primary codec.
   800                              <1>         ; eax = register
   801 000147A4 C1E010              <1>         shl     eax, VIA_REG_AC97_CMD_SHIFT
   802 000147A7 0D00008002          <1>         or      eax, VIA_REG_AC97_PRIMARY_VALID + VIA_REG_AC97_READ
   803                              <1> 
   804 000147AC E8B3FFFFFF          <1> 	call    codec_io_w16
   805                              <1> 
   806                              <1>       	; codec_valid
   807 000147B1 E831000000          <1> 	call	codec_check_ready
   808 000147B6 7301                <1>         jnc	short _cr_ok
   809                              <1> 
   810 000147B8 C3                  <1> 	retn
   811                              <1> 
   812                              <1> _cr_ok:
   813                              <1> 	; wait 25 ms
   814 000147B9 B950000000          <1> 	mov	ecx, 80 ; (100*0.25 ms)
   815                              <1> _cr_wloop:
   816 000147BE E885FFFFFF          <1> 	call	delay1_4ms
   817 000147C3 E2F9                <1> 	loop	_cr_wloop
   818                              <1> 
   819 000147C5 E8A8FFFFFF          <1>         call    codec_io_r16
   820 000147CA 25FFFF0000          <1>         and     eax, 0FFFFh
   821 000147CF C3                  <1>         retn
   822                              <1> 
   823                              <1> codec_write:
   824                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   825                              <1>         ; Use only primary codec.
   826                              <1>         
   827                              <1> 	; eax = data (volume)
   828                              <1> 	; edx = register (mixer register)
   829                              <1> 	
   830 000147D0 C1E210              <1> 	shl     edx, VIA_REG_AC97_CMD_SHIFT
   831                              <1> 
   832 000147D3 C1E000              <1>         shl     eax, VIA_REG_AC97_DATA_SHIFT ; shl eax, 0
   833 000147D6 09C2                <1>         or      edx, eax
   834                              <1> 
   835 000147D8 B800000000          <1>         mov     eax, VIA_REG_AC97_CODEC_ID_PRIMARY
   836 000147DD C1E01E              <1>         shl     eax, VIA_REG_AC97_CODEC_ID_SHIFT
   837 000147E0 09D0                <1>         or      eax, edx
   838                              <1> 
   839 000147E2 E87DFFFFFF          <1>         call    codec_io_w16
   840                              <1>         ;mov    [codec.regs+esi], ax
   841                              <1> 
   842                              <1>         ;call	codec_check_ready
   843                              <1>        	;retn
   844                              <1> 	;jmp	short _codec_check_ready	
   845                              <1> 
   846                              <1> codec_check_ready:
   847                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   848                              <1> 
   849                              <1> _codec_check_ready:
   850 000147E7 B914000000          <1> 	mov	ecx, 20	; total 2s
   851                              <1> _ccr_wait:
   852 000147EC 51                  <1> 	push	ecx
   853                              <1> 
   854 000147ED E880FFFFFF          <1>         call    codec_io_r16
   855 000147F2 A900000001          <1>         test    eax, VIA_REG_AC97_BUSY
   856 000147F7 740B                <1>         jz      short _ccr_ok
   857                              <1> 
   858 000147F9 E83DFFFFFF          <1> 	call	delay_100ms
   859                              <1> 
   860 000147FE 59                  <1> 	pop	ecx
   861                              <1> 
   862 000147FF 49                  <1> 	dec     ecx
   863 00014800 75EA                <1>         jnz     short _ccr_wait
   864                              <1> 
   865 00014802 F9                  <1>         stc
   866 00014803 C3                  <1>         retn
   867                              <1> 
   868                              <1> _ccr_ok:
   869 00014804 59                  <1> 	pop	ecx
   870 00014805 25FFFF0000          <1> 	and     eax, 0FFFFh
   871 0001480A C3                  <1>         retn
   872                              <1> 
   873                              <1> codec_config:
   874                              <1> 	; 10/06/2017
   875                              <1> 	; 29/05/2017
   876                              <1> 	; 24/04/2017
   877                              <1> 	; 21/04/2017
   878                              <1> 	; 16/04/2017 (TRDOS 386 Kernel) 
   879                              <1> 	; 15/11/2016 ('codec.asm', 'player.com')
   880                              <1> 	; 14/11/2016
   881                              <1> 	; 12/11/2016 - Erdogan Tan
   882                              <1> 	;	     (Ref: KolibriOS, 'setup_codec', codec.inc)
   883                              <1> 
   884 0001480B B802020000          <1> 	mov     eax, 0202h
   885 00014810 66A3[46940100]      <1> 	mov	[audio_master_volume], ax
   886 00014816 66B81F1F            <1> 	mov	ax, 1F1Fh ; 31,31
   887 0001481A BA02000000          <1> 	mov	edx, CODEC_MASTER_VOL_REG ; 02h ; Line Out
   888 0001481F E8ACFFFFFF          <1> 	call	codec_write
   889                              <1> 	;jc	short cconfig_error
   890                              <1> 
   891                              <1>  	;mov    eax, 0202h
   892 00014824 66B80202            <1> 	mov     ax, 0202h
   893 00014828 BA18000000          <1> 	mov	edx, CODEC_PCM_OUT_REG ; 18h ; Wave Output (Stereo)
   894 0001482D E89EFFFFFF          <1> 	call	codec_write
   895                              <1> 	;jc	short cconfig_error
   896                              <1>       
   897                              <1>  	;mov    eax, 0202h
   898 00014832 66B80202            <1> 	mov	ax, 0202h
   899 00014836 BA04000000          <1> 	mov	edx, CODEC_AUX_VOL ; 04h ; CODEC_HP_VOL_REG ; HeadPhone
   900 0001483B E890FFFFFF          <1> 	call	codec_write
   901                              <1> 	;jc	short cconfig_error
   902                              <1> 
   903                              <1>  	;mov    eax, 08h
   904                              <1>         ;mov    ax,  08h
   905 00014840 66B80880            <1> 	mov	ax, 8008h ; Mute
   906 00014844 BA0C000000          <1> 	mov	edx, 0Ch  ; AC97_PHONE_VOL ; TAD Input (Mono)
   907 00014849 E882FFFFFF          <1> 	call	codec_write
   908                              <1> 	;jc	short cconfig_error
   909                              <1> 
   910                              <1>  	;mov    eax, 0808h
   911 0001484E 66B80808            <1>         mov     ax,  0808h
   912 00014852 BA10000000          <1>         mov	edx, CODEC_LINE_IN_VOL_REG ; 10h ; Line Input (Stereo)	
   913 00014857 E874FFFFFF          <1> 	call	codec_write
   914                              <1> 	;jc	short cconfig_error
   915                              <1> 
   916                              <1>  	;mov    eax, 0808h
   917 0001485C 66B80808            <1> 	mov     ax,  0808h
   918 00014860 BA12000000          <1>         mov	edx, CODEC_CD_VOL_REG ; 12h ; CR Input (Stereo)
   919 00014865 E866FFFFFF          <1> 	call	codec_write
   920                              <1> 	;jc	short cconfig_error
   921                              <1> 
   922                              <1>  	;mov    eax, 0808h
   923 0001486A 66B80808            <1> 	mov     ax,  0808h
   924 0001486E BA16000000          <1>         mov	edx, CODEC_AUX_VOL_REG ; 16h ; Aux Input (Stereo)
   925                              <1> 	;call	codec_write
   926                              <1> 	;;jc	short cconfig_error
   927 00014873 E958FFFFFF          <1> 	jmp	codec_write ; 10/06/2017
   928                              <1> 
   929                              <1> ;	; Extended Audio Status (2Ah)
   930                              <1> ;	mov	eax, CODEC_EXT_AUDIO_CTRL_REG ; 2Ah 
   931                              <1> ;	call	codec_read
   932                              <1> ;	and     eax, 0FFFFh - 2		; clear DRA (BIT1)
   933                              <1> ;	;or     eax, 1			; set VRA (BIT0)
   934                              <1> ;	or	eax, 5  	; VRA (BIT0) & S/PDIF (BIT2) ; 14/11/2016
   935                              <1> ;	mov	edx, CODEC_EXT_AUDIO_CTRL_REG
   936                              <1> ;	call	codec_write
   937                              <1> ;	;jc	short cconfig_error
   938                              <1> ;
   939                              <1> ;set_sample_rate:
   940                              <1> ;	;movzx	eax, word [audio_freq]
   941                              <1> ;	mov	ax, [audio_freq]
   942                              <1> ;	mov	edx, CODEC_PCM_FRONT_DACRATE_REG ; 2Ch ; PCM Front DAC Rate
   943                              <1> ;	;call	codec_write
   944                              <1> ;	;retn
   945                              <1> ;	jmp	codec_write
   946                              <1> 	
   947                              <1> ;cconfig_error:
   948                              <1> ;	retn
   949                              <1> 
   950                              <1> vt8233_int_handler:
   951                              <1> 	; 27/07/2020
   952                              <1> 	; 22/07/2020
   953                              <1> 	; Interrupt Handler for VIA VT8237R Audio Controller
   954                              <1> 	; Note: called by 'dev_IRQ_service'
   955                              <1> 	; 14/10/2017 
   956                              <1> 	; 09/10/2017, 10/10/2017, 12/10/2017
   957                              <1> 	; 13/06/2017
   958                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
   959                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('player.asm') 
   960                              <1> 
   961                              <1> 	;push	eax ; * must be saved !
   962                              <1> 	;push	edx
   963                              <1> 	;push	ecx
   964                              <1> 	;push	ebx ; * must be saved !
   965                              <1> 	;push	esi
   966                              <1> 	;push	edi
   967                              <1> 
   968                              <1> 	;cmp	byte [audio_busy], 1
   969                              <1> 	;jnb	short _ih0 ; 09/10/2017
   970                              <1> 
   971                              <1> 	;mov	byte [audio_flag_eol], 0
   972                              <1> 
   973 00014878 66BA0000            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STATUS
   974 0001487C E808FFFFFF          <1>         call    ctrl_io_r8
   975                              <1> 
   976 00014881 A880                <1> 	test    al, VIA_REG_STAT_ACTIVE
   977 00014883 7417                <1>         jz      short _ih0 ; 09/10/2017
   978                              <1> 
   979 00014885 2407                <1>         and     al, VIA_REG_STAT_EOL + VIA_REG_STAT_FLAG + VIA_REG_STAT_STOPPED
   980 00014887 A2[45940100]        <1> 	mov	[audio_flag_eol], al
   981 0001488C 740E                <1>         jz	short _ih0 ; 09/10/2017
   982                              <1> 
   983                              <1> 	; 09/10/2017
   984                              <1> 	;mov	byte [audio_busy], 1
   985                              <1> 
   986 0001488E 803D[44940100]01    <1> 	cmp	byte [audio_play_cmd], 1
   987 00014895 7315                <1> 	jnb	short _ih1 ; 10/10/2017
   988                              <1> 
   989 00014897 E84A000000          <1> 	call	channel_reset
   990                              <1> _ih0:
   991                              <1> 	; 09/10/2017
   992 0001489C A0[45940100]        <1>         mov     al, [audio_flag_eol]   ;; ack ;;
   993 000148A1 66BA0000            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STATUS
   994 000148A5 E8D6FEFFFF          <1>         call    ctrl_io_w8
   995 000148AA EB39                <1> 	jmp	short _ih4
   996                              <1> _ih1:
   997                              <1> vt8233_tuneLoop:
   998 000148AC A0[45940100]        <1>         mov     al, [audio_flag_eol]   ;; ack ;;
   999 000148B1 66BA0000            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STATUS
  1000 000148B5 E8C6FEFFFF          <1>         call    ctrl_io_w8
  1001                              <1> 
  1002                              <1> 	; 22/07/2020
  1003                              <1> 	;; 12/10/2017
  1004                              <1> 	;mov	byte [audio_flag], 0 ; Reset	
  1005                              <1> 
  1006                              <1> 	; 10/10/2017
  1007                              <1> 	; 09/10/2017
  1008                              <1> 	;test	byte [audio_flag_eol], VIA_REG_STAT_FLAG
  1009                              <1> 	;jz	short _ih2 ; EOL
  1010                              <1> 
  1011                              <1> 	; 22/07/2020
  1012                              <1> 	; 14/10/2017
  1013                              <1> 	;test	byte [audio_flag_eol], VIA_REG_STAT_EOL
  1014                              <1> 	;jnz	short _ih2 ; EOL
  1015                              <1> 	;		   ; (Half Buffer 2 has been completed 
  1016                              <1> 	;		   ; and Half Buffer 1 will be played.)
  1017                              <1> 	
  1018                              <1> 	; FLAG  
  1019                              <1> 	; (Half Buffer 1 has been completed 
  1020                              <1> 	;  and Half Buffer 2 will be played.)
  1021                              <1> 
  1022                              <1> 	; 14/10/2017
  1023                              <1> 	;; (Continue to play.)
  1024                              <1> 	;mov	al, VIA_REG_CTRL_INT
  1025                              <1>        	;or	al, VIA_REG_CTRL_START
  1026                              <1>        	;mov	dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
  1027                              <1>         ;call	ctrl_io_w8
  1028                              <1> 	; 12/10/2017
  1029                              <1> 	;mov	byte [audio_flag], 1 
  1030                              <1> 
  1031                              <1> 	; 22/07/2020
  1032                              <1> 	;inc	byte [audio_flag] ; = 1
  1033                              <1> _ih2: 
  1034                              <1> 	; 10/10/2017
  1035 000148BA 8B3D[30940100]      <1> 	mov	edi, [audio_dma_buff]
  1036 000148C0 8B0D[34940100]      <1> 	mov	ecx, [audio_dmabuff_size]
  1037 000148C6 D1E9                <1> 	shr	ecx, 1 ; dma buff size / 2 = half buffer size
  1038                              <1> 	
  1039                              <1> 	; 22/07/2020
  1040                              <1> 	; 12/10/2017
  1041                              <1> 	;cmp	byte [audio_flag], 0
  1042                              <1> 	;ja	short _ih3 ; Playing Half Buffer 2 (Current: FLAG)
  1043                              <1> 	
  1044                              <1> 	; 27/07/2020
  1045                              <1> 	; 22/07/2020
  1046 000148C8 F605[38940100]01    <1> 	test	byte [audio_flag], 1  ; Current flag value
  1047 000148CF 7402                <1> 	jz	short _ih3 ; Half Buffer 1 must be filled
  1048                              <1> 
  1049                              <1> 	; Half Buffer 2 must be filled
  1050 000148D1 01CF                <1> 	add	edi, ecx
  1051                              <1> _ih3:
  1052                              <1> 	; Update half buffer 2 while playing half buffer 1
  1053                              <1> 	; Update half buffer 1 while playing half buffer 2
  1054                              <1> 
  1055 000148D3 8B35[28940100]      <1> 	mov	esi, [audio_p_buffer] ; phy addr of audio buff
  1056 000148D9 C1E902              <1> 	shr	ecx, 2 ; half buff size / 4
  1057 000148DC F3A5                <1> 	rep	movsd
  1058                              <1> 
  1059                              <1> 	; switch flag value ;
  1060 000148DE 8035[38940100]01    <1> 	xor	byte [audio_flag], 1
  1061                              <1> 	; 12/10/2017
  1062                              <1> 	; [audio_flag] = 0 : Playing dma half buffer 2
  1063                              <1> 			   ; Next buffer (to update) is dma half buff 1
  1064                              <1> 	; 	       = 1 : Playing dma half buffer 1
  1065                              <1> 			   ; Next buffer (to update) is dma half buff 2
  1066                              <1> _ih4:	
  1067                              <1> 	; 28/05/2017
  1068                              <1> 	;mov	byte [audio_busy], 0 ; 09/10/2017
  1069                              <1> 	;
  1070                              <1> 	;pop	edi
  1071                              <1> 	;pop	esi
  1072                              <1> 	;pop	ebx ; * must be restored !
  1073                              <1> 	;pop	ecx
  1074                              <1> 	;pop	edx
  1075                              <1> 	;pop	eax ; * must be restored !
  1076                              <1> 
  1077 000148E5 C3                  <1> 	retn
  1078                              <1> 
  1079                              <1> channel_reset:
  1080                              <1> 	; 24/06/2017
  1081                              <1> 	; 29/05/2017
  1082                              <1> 	; 23/03/2017
  1083                              <1> 	; 14/11/2016 - Erdogan Tan
  1084                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
  1085 000148E6 BA01000000          <1>         mov	edx, VIA_REG_OFFSET_CONTROL
  1086                              <1>         ;mov	eax, VIA_REG_CTRL_PAUSE + VIA_REG_CTRL_TERMINATE + VIA_REG_CTRL_RESET
  1087 000148EB B848000000          <1>         mov	eax, VIA_REG_CTRL_PAUSE + VIA_REG_CTRL_TERMINATE ; 24/06/2017       
  1088 000148F0 E88BFEFFFF          <1> 	call    ctrl_io_w8
  1089                              <1> 
  1090                              <1>         ;mov	edx, VIA_REG_OFFSET_CONTROL
  1091                              <1>         ;call   ctrl_io_r8
  1092                              <1> 
  1093                              <1> 	; wait for 50 ms
  1094 000148F5 B9A0000000          <1> 	mov	ecx, 160 ; (200*0.25 ms) ; 29/05/2017	
  1095                              <1> _ch_rst_wait:
  1096 000148FA E849FEFFFF          <1> 	call	delay1_4ms
  1097 000148FF 49                  <1> 	dec	ecx
  1098 00014900 75F8                <1> 	jnz	short _ch_rst_wait     
  1099                              <1> 
  1100                              <1>         ; disable interrupts
  1101 00014902 BA01000000          <1>         mov	edx, VIA_REG_OFFSET_CONTROL
  1102 00014907 31C0                <1>         xor     eax, eax
  1103 00014909 E872FEFFFF          <1>         call    ctrl_io_w8
  1104                              <1> 
  1105                              <1>         ; clear interrupts
  1106 0001490E BA00000000          <1>         mov	edx, VIA_REG_OFFSET_STATUS
  1107 00014913 B803000000          <1> 	mov	eax, 3
  1108 00014918 E863FEFFFF          <1>         call	ctrl_io_w8
  1109                              <1> 
  1110                              <1> 	;mov	edx, VIA_REG_OFFSET_CURR_PTR
  1111                              <1> 	;xor	eax, eax
  1112                              <1> 	;call	ctrl_io_w32
  1113                              <1> 
  1114 0001491D C3                  <1>         retn	
  1115                              <1> 
  1116                              <1> vt8233_stop: ; 22/04/2017
  1117 0001491E C605[44940100]00    <1> 	mov	byte [audio_play_cmd], 0 ; stop !
  1118                              <1> _tlp2:
  1119                              <1> 	; 24/06/2017
  1120                              <1>         ; finished with song, stop everything
  1121                              <1> 	;mov	al, VIA_REG_CTRL_INT
  1122                              <1>         ;or	al, VIA_REG_CTRL_TERMINATE
  1123                              <1> 	;mov	dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
  1124                              <1>         ;call	ctrl_io_w8
  1125                              <1> 
  1126                              <1>         ;call	channel_reset
  1127                              <1> 	;retn
  1128                              <1> 
  1129 00014925 EBBF                <1> 	jmp	short channel_reset
  1130                              <1> 
  1131                              <1> set_vt8233_bdl: ; Set VT8237R Buffer Descriptor List
  1132                              <1> 	; 22/07/2020 - TRDOS 386 v2.0.2
  1133                              <1> 	; 28/05/2017
  1134                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
  1135                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('via_wav.asm' - 29/11/2016) 
  1136                              <1> 	
  1137                              <1> 	; eax = dma buffer address = [audio_DMA_buff]
  1138                              <1> 	; ecx = dma buffer buffer size = [audio_dmabuff_size]
  1139                              <1> 
  1140 00014927 D1E9                <1> 	shr	ecx, 1 ; dma half buffer size
  1141 00014929 89CE                <1> 	mov	esi, ecx
  1142                              <1> 
  1143 0001492B BF[4C940100]        <1>         mov     edi, audio_bdl_buff	; get BDL address
  1144 00014930 B910000000          <1>         mov     ecx, 32 / 2		; make 32 entries in BDL
  1145                              <1> 
  1146 00014935 EB05                <1> 	jmp	short s_vt8233_bdl1 
  1147                              <1> 
  1148                              <1> s_vt8233_bdl0:
  1149                              <1> 	; set buffer descriptor 0 to start of data file in memory
  1150                              <1> 
  1151 00014937 A1[30940100]        <1>  	mov	eax, [audio_dma_buff]	; Physical address of DMA buffer
  1152                              <1>  
  1153                              <1> s_vt8233_bdl1:
  1154 0001493C AB                  <1> 	stosd				; store dmabuffer1 address
  1155                              <1> 
  1156 0001493D 89C2                <1> 	mov	edx, eax
  1157                              <1> 
  1158                              <1> ; VIA VT8235.PDF: (Page 110) (Erdogan Tan, 29/11/2016)
  1159                              <1> 	;
  1160                              <1> 	; 	Audio SGD Table Format
  1161                              <1> 	;	-------------------------------
  1162                              <1> 	;	63   62    61-56    55-32  31-0
  1163                              <1> 	;	--   --   --------  -----  ----
  1164                              <1> 	;	EOL FLAG -reserved- Base   Base
  1165                              <1> 	;		    	    Count  Address
  1166                              <1> 	;		            [23:0] [31:0]
  1167                              <1> 	;	EOL: End Of Link. 
  1168                              <1> 	;	     1 indicates this block is the last of the link.
  1169                              <1> 	;	     If the channel Interrupt on EOL bit is set, then
  1170                              <1> 	;	     an interrupt is generated at the end of the transfer.
  1171                              <1> 	;
  1172                              <1> 	;	FLAG: Block Flag. If set, transfer pauses at the end of this
  1173                              <1> 	;	      block. If the channel Interrupt on FLAG bit is set,
  1174                              <1> 	;	      then an interrupt is generated at the end of this block.
  1175                              <1> 
  1176 0001493F 89F0                <1> 	mov	eax, esi ; DMA half buffer size
  1177 00014941 01C2                <1> 	add	edx, eax
  1178 00014943 0D00000040          <1> 	or	eax, FLAG
  1179                              <1> 	;or	eax, EOL
  1180 00014948 AB                  <1> 	stosd
  1181                              <1> 
  1182                              <1> ; 2nd buffer:
  1183                              <1> 
  1184 00014949 89D0                <1>         mov	eax, edx ; Physical address of the 2nd half of DMA buffer	
  1185 0001494B AB                  <1> 	stosd		 ; store dmabuffer2 address
  1186                              <1> 
  1187                              <1> ; set length to [audio_dmabuff_size]/2
  1188                              <1> ; Set control (bits 31:16) to BUP, bits 15:0=number of samples
  1189                              <1> ; 
  1190 0001494C 89F0                <1> 	mov	eax, esi ; DMA half buffer size
  1191                              <1> 	; 22/07/2020
  1192                              <1> 	;or	eax, EOL
  1193 0001494E 0D00000040          <1> 	or	eax, FLAG
  1194 00014953 AB                  <1> 	stosd
  1195                              <1> 
  1196 00014954 E2E1                <1> 	loop    s_vt8233_bdl0
  1197                              <1> 
  1198                              <1> 	; 22/07/2020
  1199 00014956 814FFC00000080      <1> 	or	dword [edi-4], EOL
  1200                              <1> 	
  1201 0001495D C3                  <1> 	retn
  1202                              <1> 
  1203                              <1> vt8233_start_play:
  1204                              <1> 	; 01/09/2020 
  1205                              <1> 	; 22/07/2020 
  1206                              <1> 	; start to play audio data via VT8233 audio controller
  1207                              <1> 	; 13/06/2017
  1208                              <1> 	; 10/06/2017
  1209                              <1> 	; 24/04/2017 
  1210                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
  1211                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('via_wav.asm' - 29/11/2016) 
  1212                              <1> 	; write buffer descriptor list address
  1213                              <1> 
  1214                              <1> 	; Extended Audio Status (2Ah)
  1215 0001495E B82A000000          <1> 	mov	eax, CODEC_EXT_AUDIO_CTRL_REG ; 2Ah 
  1216 00014963 E83CFEFFFF          <1> 	call	codec_read
  1217 00014968 25FDFF0000          <1> 	and     eax, 0FFFFh - 2		; clear DRA (BIT1)
  1218                              <1> 	;or     eax, 1			; set VRA (BIT0)
  1219                              <1> 	;or	eax, 5  	; VRA (BIT0) & S/PDIF (BIT2) ; 14/11/2016
  1220 0001496D 0C05                <1> 	or	al, 5
  1221                              <1> 	; 01/09/2020	
  1222                              <1> 	;or	eax, 3805h ; AD1980 (PRK, PRJ, PRI = 1 .. only front DAC)
  1223                              <1> 	; 01/09/2020
  1224                              <1> 	;mov	edx, CODEC_EXT_AUDIO_CTRL_REG
  1225                              <1> 	;cmp	word [audio_freq], 0BB80h ; 48 kHz
  1226                              <1> 	;jne	short set_extd_audio_status_1
  1227                              <1> 	;and	al, 0FEh ; disable VRA bit (set sample rate to 48000 Hz)
  1228                              <1> 	;jmp	short set_extd_audio_status_2
  1229                              <1> ;set_extd_audio_status_1:
  1230 0001496F BA2A000000          <1> 	mov	edx, CODEC_EXT_AUDIO_CTRL_REG
  1231 00014974 E857FEFFFF          <1> 	call	codec_write
  1232                              <1> 	;jc	short cconfig_error
  1233                              <1> 
  1234                              <1> set_sample_rate:
  1235                              <1> 	;movzx	eax, word [audio_freq]
  1236 00014979 66A1[42940100]      <1> 	mov	ax, [audio_freq]
  1237 0001497F BA2C000000          <1> 	mov	edx, CODEC_PCM_FRONT_DACRATE_REG ; 2Ch ; PCM Front DAC Rate
  1238                              <1> ;set_extd_audio_status_2:
  1239 00014984 E847FEFFFF          <1> 	call	codec_write
  1240                              <1> 
  1241                              <1> 	; 01/09/2020
  1242                              <1> 	; set AD1980 MCB register (Index 76h) to 0C00h
  1243                              <1> 	; (CLDIS, HPSEL)
  1244                              <1> 	;mov	ax, 0C00h
  1245                              <1> 	;mov	edx, CODEC_MISC_CRTL_BITS_REG ; 76h 
  1246                              <1> 	;			; Miscellaneous Control Bit Register
  1247                              <1> 	;call	codec_write
  1248                              <1> 	;
  1249                              <1> 
  1250 00014989 B8[4C940100]        <1>         mov	eax, audio_bdl_buff
  1251                              <1>   
  1252                              <1> 	; 12/11/2016 - Erdogan Tan 
  1253                              <1> 	; (Ref: KolibriOS, vt823x.asm, 'create_primary_buff')
  1254 0001498E BA04000000          <1> 	mov	edx, VIADEV_PLAYBACK + VIA_REG_OFFSET_TABLE_PTR
  1255 00014993 E8FAFDFFFF          <1>         call	ctrl_io_w32
  1256                              <1> 
  1257                              <1> 	;call	codec_check_ready
  1258                              <1> 
  1259 00014998 66BA0200            <1>   	mov	dx, VIADEV_PLAYBACK + VIA_REG_OFS_PLAYBACK_VOLUME_L
  1260                              <1>         ;mov	eax, 2	; 31
  1261 0001499C B01F                <1> 	mov	al, 31
  1262 0001499E 2A05[46940100]      <1>         sub	al, [audio_master_volume_l]
  1263 000149A4 E8D7FDFFFF          <1> 	call	ctrl_io_w8
  1264                              <1> 
  1265                              <1> 	;call	codec_check_ready
  1266                              <1> 
  1267 000149A9 66BA0300            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFS_PLAYBACK_VOLUME_R
  1268                              <1>         ;mov	ax, 2	; 31
  1269 000149AD B01F                <1> 	mov	al, 31
  1270 000149AF 2A05[47940100]      <1>         sub	al, [audio_master_volume_r]
  1271 000149B5 E8C6FDFFFF          <1> 	call    ctrl_io_w8
  1272                              <1> 
  1273                              <1> 	;call	codec_check_ready
  1274                              <1> ;
  1275                              <1> ;
  1276                              <1> ; All set. Let's play some music.
  1277                              <1> ;
  1278                              <1> ;
  1279                              <1>        	;mov    dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STOP_IDX
  1280                              <1>         ;mov    ax, VIA8233_REG_TYPE_16BIT or VIA8233_REG_TYPE_STEREO or 0xfffff or 0xff000000
  1281                              <1>         ;call   ctrl_io_w32
  1282                              <1> 
  1283                              <1> 	;call	codec_check_ready
  1284                              <1> 
  1285                              <1> 	; 08/12/2016
  1286                              <1> 	; 07/10/2016
  1287                              <1>         ;;mov    al, 1
  1288                              <1>         ;mov	al, 31
  1289                              <1> 	; 22/07/2020
  1290 000149BA B0FF                <1> 	mov	al, 0FFh
  1291 000149BC E813000000          <1> 	call    set_VT8233_LastValidIndex
  1292                              <1> 
  1293 000149C1 C605[44940100]01    <1> 	mov	byte [audio_play_cmd], 1 ; play command (do not stop) !
  1294                              <1> 
  1295                              <1> 	; 22/07/2020
  1296                              <1> 	;mov	byte [audio_flag], 0  ; clear half buffer flag
  1297                              <1> 
  1298                              <1> vt8233_play: ; continue to play
  1299                              <1> 	; 22/04/2017
  1300                              <1> 	;mov	al, VIA_REG_CTRL_INT
  1301                              <1>        	;or	al, VIA_REG_CTRL_START
  1302                              <1>         ;;mov	al, VIA_REG_CTRL_AUTOSTART + VIA_REG_CTRL_START
  1303                              <1> 	; 22/07/2020	
  1304 000149C8 B0A1                <1> 	mov	al, VIA_REG_CTRL_AUTOSTART + VIA_REG_CTRL_START + VIA_REG_CTRL_INT_FLAG
  1305                              <1> 
  1306 000149CA 66BA0100            <1> 	mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
  1307 000149CE E8ADFDFFFF          <1>         call    ctrl_io_w8
  1308                              <1> 	;call	codec_check_ready
  1309                              <1> 	;retn
  1310                              <1> 	;jmp	codec_check_ready
  1311 000149D3 C3                  <1> 	retn
  1312                              <1> 
  1313                              <1> ;input AL = index # to stop on
  1314                              <1> set_VT8233_LastValidIndex:
  1315                              <1> 	; 23/07/2020
  1316                              <1> 	; 10/06/2017
  1317                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
  1318                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('via_wav.asm' - 29/11/2016) 
  1319                              <1> 	; 19/11/2016
  1320                              <1> 	; 14/11/2016 - Erdogan Tan (Ref: VIA VT8235.PDF, Page 110)
  1321                              <1> 	; 12/11/2016 - Erdogan Tan
  1322                              <1> 	; (Ref: KolibriOS, vt823x.asm, 'create_primary_buff')
  1323                              <1> 	;push	edx
  1324                              <1> 	;push	ax
  1325 000149D4 50                  <1> 	push	eax ; 23/07/2020
  1326                              <1> 	;push	ecx
  1327 000149D5 0FB705[42940100]    <1> 	movzx	eax, word [audio_freq] ; Hertz
  1328 000149DC BA00001000          <1> 	mov	edx, 100000h ; 2^20 = 1048576
  1329 000149E1 F7E2                <1> 	mul	edx
  1330 000149E3 B980BB0000          <1> 	mov	ecx, 48000	
  1331 000149E8 F7F1                <1> 	div	ecx
  1332                              <1> 	;and	eax, 0FFFFFh
  1333                              <1> 	;pop	ecx
  1334                              <1> 	;pop	dx 
  1335 000149EA 5A                  <1> 	pop	edx ; 23/07/2020
  1336 000149EB C1E218              <1> 	shl	edx, 24  ; STOP Index Setting: Bit 24 to 31
  1337 000149EE 09D0                <1> 	or	eax, edx
  1338                              <1> 	; 19/11/2016
  1339 000149F0 803D[40940100]10    <1> 	cmp	byte [audio_bps], 16
  1340 000149F7 7505                <1> 	jne	short sLVI_1
  1341 000149F9 0D00002000          <1> 	or	eax, VIA8233_REG_TYPE_16BIT
  1342                              <1> sLVI_1:
  1343 000149FE 803D[41940100]02    <1> 	cmp	byte [audio_stmo], 2
  1344 00014A05 7505                <1> 	jne	short sLVI_2
  1345 00014A07 0D00001000          <1> 	or	eax, VIA8233_REG_TYPE_STEREO
  1346                              <1> sLVI_2:
  1347 00014A0C BA08000000          <1> 	mov     edx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STOP_IDX
  1348 00014A11 E87CFDFFFF          <1>         call    ctrl_io_w32
  1349                              <1> 	;call	codec_check_ready
  1350                              <1> 	;pop	edx
  1351 00014A16 C3                  <1> 	retn
  1352                              <1> 
  1353                              <1> vt8233_pause: ; pause
  1354                              <1> 	; 10/06/2017
  1355                              <1> 	; 22/04/2017
  1356                              <1> 	;mov     al, VIA_REG_CTRL_INT
  1357                              <1>         ;or      al, VIA_REG_CTRL_PAUSE
  1358                              <1> 	; 23/07/2020
  1359 00014A17 B029                <1> 	mov	al, VIA_REG_CTRL_PAUSE+VIA_REG_CTRL_INT_FLAG+VIA_REG_CTRL_AUTOSTART
  1360                              <1> 	
  1361 00014A19 66BA0100            <1> 	mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
  1362 00014A1D E85EFDFFFF          <1>         call    ctrl_io_w8
  1363                              <1> 	;call	codec_check_ready
  1364                              <1> 	;retn
  1365                              <1> 	;jmp	codec_check_ready
  1366 00014A22 C3                  <1> 	retn
  1367                              <1> 
  1368                              <1> vt8233_reset: 
  1369                              <1> 	; 22/04/2017
  1370                              <1> 	; reset VT8237R (vt8233) Audio Controller
  1371                              <1> 	;cmp	byte [audio_play_cmd], 1
  1372                              <1> 	;jna	short vt8233_rst_0
  1373 00014A23 C605[44940100]00    <1> 	mov	byte [audio_play_cmd], 0 ; stop !
  1374                              <1> vt8233_rst_0:
  1375 00014A2A E8B0FCFFFF          <1> 	call	reset_codec
  1376 00014A2F 720A                <1> 	jc	short vt8233_rst_1 ; codec error !
  1377                              <1> 	; eax = 1
  1378 00014A31 E82EFDFFFF          <1> 	call	codec_io_w16 ; w32
  1379 00014A36 E8ABFEFFFF          <1> 	call	channel_reset
  1380                              <1> vt8233_rst_1:
  1381 00014A3B C3                  <1> 	retn
  1382                              <1> 
  1383                              <1> vt8233_volume:
  1384                              <1> 	; set VT8237R (vt8233) sound volume level
  1385                              <1> 	; 24/04/2017
  1386                              <1> 	; 22/04/2017
  1387                              <1> 	; bl = component (0 = master/playback/lineout volume)
  1388                              <1> 	; cl = left channel volume level (0 to 31)
  1389                              <1> 	; ch = right channel volume level (0 to 31)
  1390                              <1> 
  1391 00014A3C 08DB                <1> 	or	bl, bl
  1392 00014A3E 7520                <1> 	jnz	short vt8233_vol_1 ; temporary !
  1393 00014A40 66B81F1F            <1> 	mov	ax, 1F1Fh ; 31,31
  1394 00014A44 38C1                <1> 	cmp	cl, al
  1395 00014A46 7718                <1> 	ja	short vt8233_vol_1 ; temporary !
  1396 00014A48 38E5                <1> 	cmp	ch, ah
  1397 00014A4A 7714                <1> 	ja	short vt8233_vol_1 ; temporary !
  1398 00014A4C 66890D[46940100]    <1> 	mov	[audio_master_volume], cx
  1399 00014A53 6629C8              <1> 	sub	ax, cx
  1400 00014A56 BA02000000          <1> 	mov	edx, CODEC_MASTER_VOL_REG ; 02h ; Line Out
  1401 00014A5B E870FDFFFF          <1> 	call	codec_write
  1402                              <1> vt8233_vol_1:
  1403 00014A60 C3                  <1> 	retn
  1404                              <1> 
  1405                              <1> ; CODE for SOUND BLASTER 16
  1406                              <1> 
  1407                              <1> DetectSB:
  1408                              <1> 	; 24/04/2017
  1409                              <1> 	;pushad
  1410                              <1> ScanPort:
  1411 00014A61 66BB1002            <1> 	mov     bx, 210h	; start scanning ports
  1412                              <1> 				; 210h, 220h, .. 260h
  1413                              <1> ResetDSP:       
  1414 00014A65 6689DA              <1> 	mov     dx, bx		; try to reset the DSP.
  1415 00014A68 6683C206            <1> 	add     dx, 06h
  1416 00014A6C B001                <1> 	mov	al, 1
  1417 00014A6E EE                  <1> 	out	dx, al
  1418                              <1> 
  1419 00014A6F EC                  <1> 	in	al, dx
  1420 00014A70 EC                  <1> 	in	al, dx
  1421 00014A71 EC                  <1> 	in	al, dx
  1422 00014A72 EC                  <1> 	in	al, dx
  1423                              <1> 
  1424 00014A73 30C0                <1> 	xor     al, al
  1425 00014A75 EE                  <1> 	out	dx, al
  1426                              <1> 
  1427 00014A76 6683C208            <1> 	add     dx, 08h
  1428 00014A7A 66B96400            <1> 	mov	cx, 100
  1429                              <1> WaitID:
  1430 00014A7E EC                  <1> 	in	al, dx
  1431 00014A7F 08C0                <1> 	or      al, al
  1432 00014A81 7804                <1> 	js      short GetID
  1433 00014A83 E2F9                <1> 	loop    WaitID
  1434 00014A85 EB0F                <1> 	jmp     short NextPort
  1435                              <1> GetID:          
  1436 00014A87 6683EA04            <1> 	sub     dx, 04h
  1437 00014A8B EC                  <1> 	in	al, dx
  1438 00014A8C 3CAA                <1> 	cmp     al, 0AAh
  1439 00014A8E 7413                <1> 	je      short Found
  1440 00014A90 6683C204            <1> 	add     dx, 04h
  1441 00014A94 E2E8                <1> 	loop    WaitID
  1442                              <1> NextPort:
  1443 00014A96 6683C310            <1> 	add     bx, 10h		; if not response,
  1444 00014A9A 6681FB6002          <1> 	cmp     bx, 260h	; try the next port.
  1445 00014A9F 76C4                <1> 	jbe     short ResetDSP
  1446 00014AA1 F9                  <1> 	stc
  1447 00014AA2 C3                  <1> 	retn
  1448                              <1> Found:
  1449 00014AA3 66891D[16940100]    <1> 	mov     [audio_io_base], bx	; SB Port Address Found!
  1450                              <1> ScanIRQ:
  1451                              <1> SetIrqs:
  1452 00014AAA 28C0                <1> 	sub 	al, al ; 0
  1453 00014AAC A2[0E940100]        <1> 	mov 	[IRQnum], al ; reset
  1454 00014AB1 A2[13940100]        <1> 	mov	[audio_intr], al ; reset
  1455                              <1> 
  1456                              <1> 	; ah > 0 -> set IRQ vector
  1457                              <1> 	; al = IRQ number
  1458                              <1> 	;mov	ax, 103h ; IRQ 3
  1459                              <1> 	;call	set_hardware_int_vector
  1460                              <1> 	;mov	ax, 104h ; IRQ 4
  1461                              <1> 	;call	set_hardware_int_vector
  1462 00014AB6 66B80501            <1> 	mov	ax, 105h ; IRQ 5
  1463 00014ABA E8CADDFFFF          <1> 	call	set_hardware_int_vector
  1464 00014ABF 66B80701            <1> 	mov	ax, 107h ; IRQ 7
  1465 00014AC3 E8C1DDFFFF          <1> 	call	set_hardware_int_vector
  1466                              <1> 
  1467 00014AC8 668B15[16940100]    <1> 	mov     dx, [audio_io_base] ; tells to the SB to
  1468 00014ACF 6683C20C            <1> 	add     dx, 0Ch		    ; generate a IRQ!
  1469                              <1> WaitSb:
  1470 00014AD3 EC                  <1> 	in	al, dx
  1471 00014AD4 08C0                <1> 	or      al, al
  1472 00014AD6 78FB                <1> 	js      short WaitSb
  1473 00014AD8 B0F2                <1> 	mov     al, 0F2h
  1474 00014ADA EE                  <1> 	out	dx, al
  1475                              <1> 
  1476 00014ADB 31C9                <1> 	xor     ecx, ecx	; wait until IRQ level
  1477                              <1> WaitIRQ: 
  1478 00014ADD A0[0E940100]        <1> 	mov	al, [IRQnum]
  1479 00014AE2 3C00                <1> 	cmp     al, 0 ; is changed or timeout.
  1480 00014AE4 7706                <1> 	ja	short IrqOk
  1481 00014AE6 6649                <1> 	dec	cx
  1482 00014AE8 75F3                <1> 	jnz	short WaitIRQ
  1483 00014AEA EB15                <1> 	jmp	short RestoreIrqs
  1484                              <1> IrqOk:
  1485 00014AEC A2[13940100]        <1> 	mov	[audio_intr], al ; set   
  1486 00014AF1 668B15[16940100]    <1> 	mov     dx, [audio_io_base]
  1487 00014AF8 6683C20E            <1> 	add     dx, 0Eh
  1488 00014AFC EC                  <1> 	in	al, dx	; SB acknowledge.
  1489 00014AFD B020                <1> 	mov	al, 20h
  1490 00014AFF E620                <1> 	out	20h, al	; Hardware acknowledge.
  1491                              <1> 
  1492                              <1> RestoreIrqs:
  1493                              <1> 	; ah = 0 -> reset IRQ vector
  1494                              <1> 	; al = IRQ number
  1495                              <1> 	;mov	ax, 3 ; IRQ 3
  1496                              <1> 	;call	set_hardware_int_vector
  1497                              <1> 	;mov	ax, 4 ; IRQ 4
  1498                              <1> 	;call	set_hardware_int_vector
  1499 00014B01 66B80500            <1> 	mov	ax, 5 ; IRQ 5
  1500 00014B05 E87FDDFFFF          <1> 	call	set_hardware_int_vector
  1501 00014B0A 66B80700            <1> 	mov	ax, 7 ; IRQ 7
  1502 00014B0E E876DDFFFF          <1> 	call	set_hardware_int_vector
  1503                              <1> 
  1504 00014B13 31D2                <1> 	xor	edx, edx
  1505 00014B15 8915[18940100]      <1> 	mov	[audio_dev_id], edx ; 0
  1506 00014B1B 8915[1C940100]      <1> 	mov	[audio_vendor], edx ; 0
  1507 00014B21 8915[20940100]      <1> 	mov	[audio_stats_cmd], edx ; 0
  1508                              <1> 
  1509                              <1> 	;popad
  1510                              <1> 
  1511 00014B27 803D[13940100]01    <1> 	cmp     byte [audio_intr], 1 ; IRQ level was changed?
  1512                              <1> 	
  1513 00014B2E C3                  <1> 	retn
  1514                              <1> 
  1515                              <1> %macro	SbOut	1
  1516                              <1> %%Wait:
  1517                              <1> 	in	al, dx
  1518                              <1> 	or	al, al
  1519                              <1> 	js	short %%Wait
  1520                              <1> 	mov	al, %1
  1521                              <1> 	out	dx, al
  1522                              <1> %endmacro
  1523                              <1> 
  1524                              <1> SbInit_play:
  1525                              <1> 	; 22/10/2017
  1526                              <1> 	; 20/10/2017
  1527                              <1> 	; 06/10/2017
  1528                              <1> 	; 13/07/2017, 09/08/2017
  1529                              <1> 	; 24/04/2017, 15/05/2017, 24/06/2017
  1530                              <1> 	;pushad
  1531                              <1> SetBuffer:
  1532                              <1> 	;mov	byte [DmaFlag], 0
  1533                              <1> 
  1534 00014B2F 8B1D[30940100]      <1> 	mov	ebx, [audio_dma_buff] ; physical addr of DMA buff
  1535 00014B35 89DF                <1> 	mov	edi, ebx
  1536 00014B37 8B0D[34940100]      <1> 	mov     ecx, [audio_dmabuff_size]
  1537                              <1> 
  1538 00014B3D 803D[40940100]10    <1> 	cmp	byte [audio_bps], 16
  1539 00014B44 7531                <1> 	jne	short sbInit_0 ; set 8 bit DMA buffer
  1540                              <1> 	
  1541                              <1> 	; 09/08/2017
  1542                              <1> 	; convert byte count to word count
  1543 00014B46 D1E9                <1> 	shr	ecx, 1
  1544 00014B48 49                  <1> 	dec	ecx ; word count - 1
  1545                              <1> 	; convert byte offset to word offset
  1546 00014B49 D1EB                <1> 	shr	ebx, 1
  1547                              <1> 
  1548                              <1> 	; 16 bit DMA buffer setting (DMA channel 5)
  1549 00014B4B B005                <1> 	mov     al, 05h  ; set mask bit for channel 5  (4+1)
  1550 00014B4D E6D4                <1> 	out	0D4h, al
  1551                              <1> 	
  1552 00014B4F 30C0                <1> 	xor     al, al   ; stops all DMA processes on selected channel
  1553 00014B51 E6D8                <1> 	out	0D8h, al ; clear selected channel register
  1554                              <1> 
  1555 00014B53 88D8                <1> 	mov     al, bl	 ; byte 0 of DMA buffer offset in words (physical) 
  1556 00014B55 E6C4                <1> 	out	0C4h, al ; DMA channel 5 port number
  1557                              <1> 
  1558 00014B57 88F8                <1> 	mov     al, bh   ; byte 1 of DMA buffer offset in words (physical)   
  1559 00014B59 E6C4                <1> 	out	0C4h, al
  1560                              <1> 	
  1561                              <1> 	; 09/08/2017
  1562 00014B5B C1EB0F              <1> 	shr	ebx, 15	 ; complete 16 bit shift
  1563 00014B5E 80E3FE              <1> 	and	bl, 0FEh ; clear bit 0 (not necessary, it will be ignored)
  1564                              <1> 
  1565 00014B61 88D8                <1> 	mov     al, bl   ; byte 2 of DMA buffer address (physical) 
  1566 00014B63 E68B                <1> 	out	8Bh, al  ; page register port addr for channel 5 ; 13/07/2017
  1567                              <1> 
  1568 00014B65 88C8                <1> 	mov     al, cl   ; low byte of DMA count - 1
  1569 00014B67 E6C6                <1> 	out	0C6h, al ; count register port addr for channel 1
  1570                              <1> 
  1571 00014B69 88E8                <1> 	mov     al, ch   ; high byte of DMA count - 1
  1572 00014B6B E6C6                <1> 	out	0C6h, al
  1573                              <1> 
  1574                              <1> 	; channel 5, read, autoinitialized, single mode
  1575                              <1> 	;mov	al, 49h
  1576 00014B6D B059                <1> 	mov	al, 59h  ; 06/10/2017 
  1577 00014B6F E6D6                <1> 	out	0D6h, al ; DMA mode register port address
  1578                              <1> 
  1579 00014B71 B001                <1> 	mov     al, 01h  ; clear mask bit for channel 1
  1580 00014B73 E6D4                <1> 	out	0D4h, al ; DMA mask register port address
  1581                              <1> 
  1582 00014B75 EB28                <1> 	jmp	short ClearBuffer
  1583                              <1> 
  1584                              <1> sbInit_0:    
  1585 00014B77 49                  <1> 	dec     ecx ; 09/08/2017
  1586                              <1> 
  1587                              <1> 	; 8 bit DMA buffer setting (DMA channel 1)
  1588 00014B78 B005                <1> 	mov     al, 05h ; set mask bit for channel 1  (4+1)
  1589 00014B7A E60A                <1> 	out	0Ah, al ; DMA mask register
  1590                              <1> 
  1591 00014B7C 30C0                <1> 	xor     al, al  ; stops all DMA processes on selected channel
  1592 00014B7E E60C                <1> 	out	0Ch, al ; clear selected channel register
  1593                              <1> 
  1594 00014B80 88D8                <1> 	mov     al, bl	; byte 0 of DMA buffer address (physical)   
  1595 00014B82 E602                <1> 	out	02h, al ; DMA channel 1 port number
  1596                              <1> 
  1597 00014B84 88F8                <1> 	mov     al, bh  ; byte 1 of DMA buffer address (physical)   
  1598 00014B86 E602                <1> 	out	02h, al
  1599                              <1> 
  1600 00014B88 C1EB10              <1> 	shr	ebx, 16
  1601                              <1> 
  1602 00014B8B 88D8                <1> 	mov     al, bl  ; byte 2 of DMA buffer address (physical)   
  1603 00014B8D E683                <1> 	out	83h, al ; page register port addr for channel 1
  1604                              <1> 
  1605 00014B8F 88C8                <1> 	mov     al, cl  ; low byte of DMA count - 1
  1606 00014B91 E603                <1> 	out	03h, al ; count register port addr for channel 1
  1607                              <1> 
  1608 00014B93 88E8                <1> 	mov     al, ch  ; high byte of DMA count - 1
  1609 00014B95 E603                <1> 	out	03h, al
  1610                              <1> 
  1611                              <1> 	; channel 1, read, autoinitialized, single mode
  1612                              <1> 	;mov	al, 49h
  1613 00014B97 B059                <1> 	mov	al, 59h ; 06/10/2017 
  1614 00014B99 E60B                <1> 	out	0Bh, al ; DMA mode register port address
  1615                              <1> 
  1616 00014B9B B001                <1> 	mov     al, 01h ; clear mask bit for channel 1
  1617 00014B9D E60A                <1> 	out	0Ah, al ; DMA mask register port address
  1618                              <1> 
  1619                              <1> ClearBuffer:
  1620                              <1> 	;;mov	edi, [audio_dma_buff]
  1621                              <1> 	;;mov	ecx, [audio_dmabuff_size]
  1622                              <1> 	;inc	ecx
  1623                              <1> 	;mov     al, 80h
  1624                              <1> 	;;cld
  1625                              <1> 	;rep     stosb
  1626                              <1> SetIrq:
  1627                              <1> 	;mov	ebx, SbIrqhandler
  1628                              <1> 	;mov	al, [audio_intr] ; IRQ number	
  1629                              <1> 	;call	set_dev_IRQ_service
  1630                              <1> 	;; SETUP (audio) INTERRUPT CALLBACK SERVICE
  1631                              <1> 	;mov	bl, [audio_intr] ; IRQ number
  1632                              <1> 	;mov	bh, [audio_cb_mode]
  1633                              <1> 	;inc	bh  ; 1 = Signal Response Byte method (fixed value)
  1634                              <1> 	;	    ; 2 = Callback service method
  1635                              <1> 	;	    ; 3 = Auto Increment S.R.B. method 	
  1636                              <1> 	;mov	cl, [audio_srb]
  1637                              <1> 	;mov	edx, [audio_cb_addr]
  1638                              <1> 	;mov	al, [audio_user]
  1639                              <1>  	;call	set_irq_callback_service
  1640                              <1> ResetDsp:
  1641 00014B9F 668B15[16940100]    <1> 	mov     dx, [audio_io_base]
  1642 00014BA6 6683C206            <1> 	add     dx, 06h
  1643 00014BAA B001                <1> 	mov     al, 1
  1644 00014BAC EE                  <1> 	out	dx, al
  1645                              <1> 
  1646 00014BAD EC                  <1> 	in	al, dx
  1647 00014BAE EC                  <1> 	in	al, dx
  1648 00014BAF EC                  <1> 	in	al, dx
  1649 00014BB0 EC                  <1> 	in	al, dx
  1650                              <1> 
  1651 00014BB1 30C0                <1> 	xor     al, al
  1652 00014BB3 EE                  <1> 	out	dx, al
  1653                              <1> 
  1654 00014BB4 66B96400            <1> 	mov     cx, 100
  1655 00014BB8 28E4                <1> 	sub	ah, ah ; 0
  1656                              <1> WaitId:         
  1657 00014BBA 668B15[16940100]    <1> 	mov     dx, [audio_io_base]
  1658 00014BC1 6683C20E            <1> 	add     dx, 0Eh
  1659 00014BC5 EC                  <1> 	in	al, dx
  1660 00014BC6 08C0                <1> 	or      al, al
  1661 00014BC8 7807                <1> 	js      short sb_GetId
  1662 00014BCA E2EE                <1> 	loop    WaitId
  1663 00014BCC E9B4000000          <1> 	jmp     sb_Exit
  1664                              <1> sb_GetId:
  1665 00014BD1 668B15[16940100]    <1> 	mov     dx, [audio_io_base]
  1666 00014BD8 6683C20A            <1> 	add     dx, 0Ah
  1667 00014BDC EC                  <1> 	in	al, dx
  1668 00014BDD 3CAA                <1> 	cmp     al, 0AAh
  1669 00014BDF 7407                <1> 	je      short SbOk
  1670 00014BE1 E2D7                <1> 	loop    WaitId
  1671 00014BE3 E99D000000          <1> 	jmp	sb_Exit
  1672                              <1> SbOk:
  1673 00014BE8 668B15[16940100]    <1> 	mov     dx, [audio_io_base]
  1674 00014BEF 6683C20C            <1> 	add     dx, 0Ch
  1675                              <1> 	SbOut   0D1h ; Turn on speaker
  1675                              <2> %%Wait:
  1675 00014BF3 EC                  <2>  in al, dx
  1675 00014BF4 08C0                <2>  or al, al
  1675 00014BF6 78FB                <2>  js short %%Wait
  1675 00014BF8 B0D1                <2>  mov al, %1
  1675 00014BFA EE                  <2>  out dx, al
  1676                              <1> 	SbOut   41h ; 8 bit or 16 bit transfer
  1676                              <2> %%Wait:
  1676 00014BFB EC                  <2>  in al, dx
  1676 00014BFC 08C0                <2>  or al, al
  1676 00014BFE 78FB                <2>  js short %%Wait
  1676 00014C00 B041                <2>  mov al, %1
  1676 00014C02 EE                  <2>  out dx, al
  1677 00014C03 668B1D[42940100]    <1> 	mov	bx, [audio_freq] ; sampling rate (Hz)
  1678                              <1> 	SbOut	bh ; sampling rate high byte
  1678                              <2> %%Wait:
  1678 00014C0A EC                  <2>  in al, dx
  1678 00014C0B 08C0                <2>  or al, al
  1678 00014C0D 78FB                <2>  js short %%Wait
  1678 00014C0F 88F8                <2>  mov al, %1
  1678 00014C11 EE                  <2>  out dx, al
  1679                              <1> 	SbOut	bl ; sampling rate low byte
  1679                              <2> %%Wait:
  1679 00014C12 EC                  <2>  in al, dx
  1679 00014C13 08C0                <2>  or al, al
  1679 00014C15 78FB                <2>  js short %%Wait
  1679 00014C17 88D8                <2>  mov al, %1
  1679 00014C19 EE                  <2>  out dx, al
  1680                              <1> 
  1681                              <1> 	; 22/05/2017
  1682 00014C1A E8C0000000          <1> 	call	sb16_volume_initial ; 15/05/2017
  1683                              <1> 	; 20/05/2017
  1684                              <1> 	;call	sb16_volume
  1685                              <1> 
  1686                              <1> StartDma:  
  1687                              <1> 	; autoinitialized mode
  1688 00014C1F 803D[40940100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit samples
  1689 00014C26 7411                <1> 	je	short sb_play_1
  1690                              <1> 	; 8 bit samples
  1691 00014C28 66BBC600            <1> 	mov	bx, 0C6h ; 8 bit output (0C6h)
  1692 00014C2C 803D[41940100]02    <1> 	cmp	byte [audio_stmo], 2 ; 1 = mono, 2 = stereo
  1693 00014C33 7214                <1> 	jb	short sb_play_2
  1694 00014C35 B720                <1> 	mov	bh, 20h	; 8 bit stereo (20h)
  1695 00014C37 EB10                <1> 	jmp	short sb_play_2
  1696                              <1> sb_play_1:
  1697                              <1> 	; 16 bit samples
  1698 00014C39 66BBB610            <1> 	mov	bx, 10B6h ; 16 bit output (0B6h)
  1699 00014C3D 803D[41940100]02    <1> 	cmp	byte [audio_stmo], 2 ; 1 = mono, 2 = stereo
  1700 00014C44 7203                <1> 	jb	short sb_play_2
  1701 00014C46 80C720              <1> 	add	bh, 20h	; 16 bit stereo (30h)
  1702                              <1> sb_play_2:     
  1703                              <1> 	; PCM output (8/16 bit mono autoinitialized transfer)
  1704                              <1> 	SbOut   bl ; bCommand
  1704                              <2> %%Wait:
  1704 00014C49 EC                  <2>  in al, dx
  1704 00014C4A 08C0                <2>  or al, al
  1704 00014C4C 78FB                <2>  js short %%Wait
  1704 00014C4E 88D8                <2>  mov al, %1
  1704 00014C50 EE                  <2>  out dx, al
  1705                              <1> 	SbOut	bh ; bMode
  1705                              <2> %%Wait:
  1705 00014C51 EC                  <2>  in al, dx
  1705 00014C52 08C0                <2>  or al, al
  1705 00014C54 78FB                <2>  js short %%Wait
  1705 00014C56 88F8                <2>  mov al, %1
  1705 00014C58 EE                  <2>  out dx, al
  1706 00014C59 8B1D[34940100]      <1> 	mov	ebx, [audio_dmabuff_size]  ; 15/05/2017
  1707 00014C5F D1EB                <1> 	shr	ebx, 1 ; half buffer size
  1708                              <1> 	; 20/10/2017	
  1709 00014C61 803D[40940100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit DMA
  1710 00014C68 7502                <1> 	jne	short sb_play_3
  1711 00014C6A D1EB                <1> 	shr	ebx, 1 ; byte count to word count
  1712                              <1> sb_play_3: 
  1713 00014C6C 664B                <1> 	dec	bx  ; wBlkSize is one less than the actual size 
  1714                              <1> 	SbOut   bl
  1714                              <2> %%Wait:
  1714 00014C6E EC                  <2>  in al, dx
  1714 00014C6F 08C0                <2>  or al, al
  1714 00014C71 78FB                <2>  js short %%Wait
  1714 00014C73 88D8                <2>  mov al, %1
  1714 00014C75 EE                  <2>  out dx, al
  1715                              <1> 	SbOut   bh
  1715                              <2> %%Wait:
  1715 00014C76 EC                  <2>  in al, dx
  1715 00014C77 08C0                <2>  or al, al
  1715 00014C79 78FB                <2>  js short %%Wait
  1715 00014C7B 88F8                <2>  mov al, %1
  1715 00014C7D EE                  <2>  out dx, al
  1716                              <1> 
  1717 00014C7E C605[44940100]01    <1> 	mov	byte [audio_play_cmd], 1 ; playing !
  1718                              <1> 
  1719                              <1> 	;; Set Voice and master volumes
  1720                              <1> 	;mov	dx, [audio_io_base]
  1721                              <1> 	;add	dl, 4 ; Mixer chip Register Address Port
  1722                              <1> 	;SbOut	30h   ; select Master Volume Register (L)
  1723                              <1> 	;inc	dl    ; Mixer chip Register Data Port
  1724                              <1> 	;SbOut	0F8h  ; Max. volume value is 31 (31*8)
  1725                              <1> 	;dec	dl
  1726                              <1> 	;SbOut	31h   ; select Master Volume Register (R)
  1727                              <1> 	;inc	dl
  1728                              <1> 	;SbOut	0F8h  ; Max. volume value is 31 (31*8)
  1729                              <1> 	;dec	dl
  1730                              <1> 	;SbOut	32h   ; select Voice Volume Register (L)
  1731                              <1> 	;inc	dl
  1732                              <1> 	;SbOut	0F8h  ; Max. volume value is 31 (31*8)
  1733                              <1> 	;dec	dl
  1734                              <1> 	;SbOut	33h   ; select Voice Volume Register (R)
  1735                              <1> 	;inc	dl
  1736                              <1> 	;SbOut	0F8h  ; Max. volume value is 31 (31*8)	
  1737                              <1> 	;;
  1738                              <1> 	;dec	dl
  1739                              <1> 	;SbOut	44h   ; select Treble Register (L)
  1740                              <1> 	;inc	dl
  1741                              <1> 	;SbOut	0F0h  ; Max. Treble value is 15 (15*16)
  1742                              <1> 	;dec	dl
  1743                              <1> 	;SbOut	45h   ; select Treble Register (R)
  1744                              <1> 	;inc	dl
  1745                              <1> 	;SbOut	0F0h  ; Max. Treble value is 15 (15*16)
  1746                              <1> 	;dec	dl
  1747                              <1> 	;SbOut	46h   ; select Bass Register (L)
  1748                              <1> 	;inc	dl
  1749                              <1> 	;SbOut	0F0h  ; Max. Bass value is 15 (15*16)
  1750                              <1> 	;dec	dl
  1751                              <1> 	;SbOut	47h   ; select Bass Register (R)
  1752                              <1> 	;inc	dl
  1753                              <1> 	;SbOut	0F0h  ; Max. Bass value is 15 (15*16)	
  1754                              <1> 
  1755                              <1> sb_Exit:           
  1756                              <1> 	;popad
  1757 00014C85 C3                  <1> 	retn
  1758                              <1> 
  1759                              <1> sb16_int_handler:
  1760                              <1> 	; Interrupt Handler for Sound Blaster 16 Audio Card
  1761                              <1> 	; Note: called by 'dev_IRQ_service'
  1762                              <1> 	; 20/10/2017
  1763                              <1> 	; 12/10/2017
  1764                              <1> 	; 10/10/2017 
  1765                              <1> 	; 12/05/2017, 09/10/2017
  1766                              <1> 	; 24/04/2017 (TRDOS 386 kernel, 'audio.s')
  1767                              <1> 	; 10/03/2017 - 'PLAYWAV.PRG' ('playwav.s') 
  1768                              <1> 
  1769                              <1> 	;push	eax ; * must be saved !
  1770                              <1> 	;push	ebx ; * must be saved !
  1771                              <1> 	;push	ecx
  1772                              <1> 	;push	edx
  1773                              <1> 	;push	esi
  1774                              <1> 	;push	edi
  1775                              <1> 
  1776 00014C86 668B15[16940100]    <1> 	mov     dx, [audio_io_base]
  1777                              <1> 	; 20/10/2017
  1778 00014C8D 80C20F              <1> 	add     dl, 0Fh ; 2xFh (DSP 16 bit intr ack)
  1779 00014C90 803D[40940100]10    <1> 	cmp	byte [audio_bps], 16
  1780 00014C97 7402                <1> 	je	short sb_irq_16bit_ack
  1781                              <1> sb_irq_8bit_ack:
  1782 00014C99 FECA                <1> 	dec	dl  ; 2xEh (DSP 8 bit intr ack)
  1783                              <1> sb_irq_16bit_ack:
  1784 00014C9B EC                  <1> 	in	al, dx
  1785                              <1> 
  1786                              <1> 	;cmp	byte [audio_busy], 0
  1787                              <1> 	;ja	short sb_irq_h3
  1788                              <1> 
  1789                              <1> 	;mov	byte [audio_busy], 1
  1790                              <1> 
  1791 00014C9C 803D[44940100]01    <1> 	cmp	byte [audio_play_cmd], 1
  1792 00014CA3 7307                <1> 	jnb	short sb_irq_h1
  1793                              <1> sb_irq_h0:
  1794 00014CA5 E8A9000000          <1> 	call	sb16_stop
  1795 00014CAA EB2B                <1> 	jmp	short sb_irq_h3
  1796                              <1> sb_irq_h1:
  1797                              <1> 	;call	sb16_tuneloop
  1798                              <1> 	; 09/10/2017
  1799                              <1> sb16_tuneloop:
  1800 00014CAC 8B3D[30940100]      <1> 	mov	edi, [audio_dma_buff]
  1801 00014CB2 8B0D[34940100]      <1> 	mov	ecx, [audio_dmabuff_size]
  1802 00014CB8 D1E9                <1> 	shr	ecx, 1 ; dma buff size / 2 = half buffer size
  1803                              <1> 
  1804                              <1> 	; 22/05/2017
  1805 00014CBA F605[38940100]01    <1> 	test	byte [audio_flag], 1  ; Current flag value
  1806 00014CC1 7402                <1> 	jz	short sb_tlp1 ; EOL (Half Buffer 1 must be filled)
  1807                              <1> 	; FLAG (Half Buffer 2 must be filled)
  1808 00014CC3 01CF                <1> 	add	edi, ecx
  1809                              <1> 	; 15/05/2017
  1810                              <1> sb_tlp1: 
  1811 00014CC5 8B35[28940100]      <1> 	mov	esi, [audio_p_buffer] ; phy addr of audio buff
  1812                              <1> 	;rep	movsb
  1813 00014CCB C1E902              <1> 	shr	ecx, 2 ; half buff size / 4
  1814 00014CCE F3A5                <1> 	rep	movsd 
  1815                              <1> 	;retn
  1816                              <1> 
  1817                              <1> 	; 10/10/2017
  1818                              <1> 	; switch flag value
  1819 00014CD0 8035[38940100]01    <1> 	xor	byte [audio_flag], 1
  1820                              <1> 
  1821                              <1> 	; 12/10/2017
  1822                              <1> 	; [audio_flag] = 0 : Playing dma half buffer 2 (odd intr count)
  1823                              <1> 			   ; Next buffer (to update) is dma half buff 1
  1824                              <1> 	; 	       = 1 : Playing dma half buffer 1 (even intr count)
  1825                              <1> 			   ; Next buffer (to update) is dma half buff 2
  1826                              <1> 
  1827                              <1> sb_irq_h3:
  1828                              <1> 	;mov	byte [audio_busy], 0
  1829                              <1> 
  1830                              <1> 	;pop	edi
  1831                              <1> 	;pop	esi
  1832                              <1> 	;pop	edx
  1833                              <1> 	;pop	ecx
  1834                              <1> 	;pop	ebx ; * must be restored !
  1835                              <1> 	;pop	eax ; * must be restored !
  1836                              <1> 	
  1837 00014CD7 C3                  <1> 	retn
  1838                              <1> 
  1839                              <1> sb16_volume:
  1840                              <1> 	; 22/10/2017
  1841                              <1> 	; mov [audio_master_volume_l], cl 
  1842                              <1> 	; mov [audio_master_volume_h], ch 
  1843 00014CD8 66890D[46940100]    <1> 	mov	[audio_master_volume], cx
  1844                              <1> sb16_volume_initial:
  1845 00014CDF 6652                <1> 	push	dx ; DX (port address) must be saved
  1846 00014CE1 668B15[16940100]    <1> 	mov	dx, [audio_io_base]
  1847 00014CE8 6683C204            <1> 	add	dx, 4 ; Mixer chip address port
  1848 00014CEC B022                <1> 	mov	al, 22h ; master volume
  1849 00014CEE EE                  <1> 	out	dx, al
  1850 00014CEF 6642                <1> 	inc	dx
  1851 00014CF1 8A25[46940100]      <1> 	mov	ah, [audio_master_volume_l]
  1852 00014CF7 C0EC02              <1> 	shr	ah, 2 ; 32 -> 8 level
  1853 00014CFA C0E405              <1> 	shl	ah, 5 ; bit 5 to 7
  1854 00014CFD A0[47940100]        <1> 	mov	al, [audio_master_volume_r]	
  1855 00014D02 C0E802              <1> 	shr	al, 2 ; 32 -> 8 level
  1856                              <1> 	;and	al, 0Fh
  1857 00014D05 D0E0                <1> 	shl	al, 1 ; bit 1 to 3
  1858 00014D07 08E0                <1> 	or	al, ah
  1859 00014D09 EE                  <1> 	out	dx, al
  1860 00014D0A 665A                <1> 	pop	dx ; DX (port address) must be restored
  1861 00014D0C C3                  <1> 	retn
  1862                              <1> 
  1863                              <1> sb16_pause:
  1864 00014D0D 668B15[16940100]    <1> 	mov	dx, [audio_io_base]
  1865 00014D14 6683C20C            <1> 	add	dx, 0Ch ; Command & Data Port
  1866 00014D18 803D[40940100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit samples
  1867 00014D1F 7404                <1> 	je	short sb_pause_1
  1868                              <1> 	; 8 bit samples
  1869 00014D21 B3D0                <1> 	mov	bl, 0D0h ; 8 bit DMA mode
  1870 00014D23 EB02                <1> 	jmp	short sb_pause_2
  1871                              <1> sb_pause_1:
  1872                              <1> 	; 16 bit samples
  1873 00014D25 B3D5                <1> 	mov	bl, 0D5h ; 16 bit DMA mode
  1874                              <1> sb_pause_2:     
  1875                              <1> 	SbOut   bl ; bCommand
  1875                              <2> %%Wait:
  1875 00014D27 EC                  <2>  in al, dx
  1875 00014D28 08C0                <2>  or al, al
  1875 00014D2A 78FB                <2>  js short %%Wait
  1875 00014D2C 88D8                <2>  mov al, %1
  1875 00014D2E EE                  <2>  out dx, al
  1876                              <1> sb_pause_3:
  1877 00014D2F C3                  <1> 	retn
  1878                              <1> 
  1879                              <1> sb16_continue:
  1880 00014D30 668B15[16940100]    <1> 	mov	dx, [audio_io_base]
  1881 00014D37 6683C20C            <1> 	add	dx, 0Ch ; Command & Data Port
  1882 00014D3B 803D[40940100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit samples
  1883 00014D42 7404                <1> 	je	short sb_cont_1
  1884                              <1> 	; 8 bit samples
  1885 00014D44 B3D4                <1> 	mov	bl, 0D4h ; 8 bit DMA mode
  1886 00014D46 EB02                <1> 	jmp	short sb_cont_2
  1887                              <1> sb_cont_1:
  1888                              <1> 	; 16 bit samples
  1889 00014D48 B3D6                <1> 	mov	bl, 0D6h ; 16 bit DMA mode
  1890                              <1> sb_cont_2:     
  1891                              <1> 	SbOut   bl ; bCommand
  1891                              <2> %%Wait:
  1891 00014D4A EC                  <2>  in al, dx
  1891 00014D4B 08C0                <2>  or al, al
  1891 00014D4D 78FB                <2>  js short %%Wait
  1891 00014D4F 88D8                <2>  mov al, %1
  1891 00014D51 EE                  <2>  out dx, al
  1892                              <1> sb_cont_3:
  1893 00014D52 C3                  <1> 	retn
  1894                              <1> 
  1895                              <1> sb16_stop:
  1896                              <1> 	; 24/04/2017
  1897 00014D53 803D[44940100]00    <1> 	cmp	byte [audio_play_cmd], 0
  1898 00014D5A 7648                <1> 	jna	short sb16_stop_4
  1899                              <1> 
  1900                              <1> 	; 22/05/2017
  1901 00014D5C 668B15[16940100]    <1> 	mov	dx, [audio_io_base]
  1902 00014D63 6683C20C            <1> 	add	dx, 0Ch
  1903                              <1> 
  1904 00014D67 B3D9                <1> 	mov	bl, 0D9h ; exit auto-initialize 16 bit transfer
  1905                              <1> 	; stop  autoinitialized DMA transfer mode 
  1906 00014D69 803D[40940100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit samples
  1907 00014D70 7402                <1> 	je	short sb16_stop_1
  1908                              <1> 	;mov	bl, 0DAh ; exit auto-initialize 8 bit transfer
  1909 00014D72 FEC3                <1> 	inc	bl
  1910                              <1> sb16_stop_1:
  1911                              <1> 	SbOut	bl ; exit auto-initialize transfer command
  1911                              <2> %%Wait:
  1911 00014D74 EC                  <2>  in al, dx
  1911 00014D75 08C0                <2>  or al, al
  1911 00014D77 78FB                <2>  js short %%Wait
  1911 00014D79 88D8                <2>  mov al, %1
  1911 00014D7B EE                  <2>  out dx, al
  1912                              <1> 
  1913 00014D7C 30C0                <1> 	xor     al, al ; stops all DMA processes on selected channel
  1914                              <1> 
  1915 00014D7E 803D[40940100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit samples
  1916 00014D85 7404                <1> 	je	short sb16_stop_2
  1917 00014D87 E60C                <1> 	out	0Ch, al ; clear selected channel register
  1918 00014D89 EB02                <1> 	jmp	short sb16_stop_3
  1919                              <1> 
  1920                              <1> sb16_stop_2:
  1921 00014D8B E6D8                <1> 	out	0D8h, al ; clear selected channel register
  1922                              <1> 
  1923                              <1> sb16_stop_3:
  1924 00014D8D C605[44940100]00    <1> 	mov	byte [audio_play_cmd], 0 ; stop !
  1925                              <1> SbDone:
  1926                              <1> 	;mov	dx, [audio_io_base]
  1927                              <1> 	;add	dx, 0Ch
  1928                              <1> 	SbOut   0D0h
  1928                              <2> %%Wait:
  1928 00014D94 EC                  <2>  in al, dx
  1928 00014D95 08C0                <2>  or al, al
  1928 00014D97 78FB                <2>  js short %%Wait
  1928 00014D99 B0D0                <2>  mov al, %1
  1928 00014D9B EE                  <2>  out dx, al
  1929                              <1> 	SbOut   0D3h
  1929                              <2> %%Wait:
  1929 00014D9C EC                  <2>  in al, dx
  1929 00014D9D 08C0                <2>  or al, al
  1929 00014D9F 78FB                <2>  js short %%Wait
  1929 00014DA1 B0D3                <2>  mov al, %1
  1929 00014DA3 EE                  <2>  out dx, al
  1930                              <1> sb16_stop_4:
  1931 00014DA4 C3                  <1> 	retn
  1932                              <1> 
  1933                              <1> sb16_reset:
  1934                              <1> 	; 24/04/2017      
  1935 00014DA5 668B15[16940100]    <1> 	mov     dx, [audio_io_base] ; try to reset the DSP.
  1936 00014DAC 6683C206            <1> 	add     dx, 06h
  1937 00014DB0 B001                <1> 	mov	al, 1
  1938 00014DB2 EE                  <1> 	out	dx, al
  1939                              <1> 
  1940 00014DB3 EC                  <1> 	in	al, dx
  1941 00014DB4 EC                  <1> 	in	al, dx
  1942 00014DB5 EC                  <1> 	in	al, dx
  1943 00014DB6 EC                  <1> 	in	al, dx
  1944                              <1> 
  1945 00014DB7 30C0                <1> 	xor     al, al
  1946 00014DB9 EE                  <1> 	out	dx, al
  1947                              <1> 
  1948 00014DBA 6683C208            <1> 	add     dx, 08h
  1949 00014DBE 66B96400            <1> 	mov	cx, 100
  1950                              <1> sbrstWaitID:
  1951 00014DC2 EC                  <1> 	in	al, dx
  1952 00014DC3 08C0                <1> 	or      al, al
  1953 00014DC5 7804                <1> 	js      short sbrstGetID
  1954 00014DC7 E2F9                <1> 	loop    sbrstWaitID
  1955 00014DC9 F9                  <1> 	stc
  1956 00014DCA C3                  <1> 	retn
  1957                              <1> sbrstGetID:          
  1958 00014DCB 6683EA04            <1> 	sub     dx, 04h
  1959 00014DCF EC                  <1> 	in	al, dx
  1960 00014DD0 3CAA                <1> 	cmp     al, 0AAh
  1961 00014DD2 7406                <1> 	je      short sb_rst_retn
  1962 00014DD4 6683C204            <1> 	add     dx, 04h
  1963 00014DD8 E2E8                <1> 	loop    sbrstWaitID
  1964                              <1> sb_rst_retn:
  1965 00014DDA C3                  <1> 	retn
  1966                              <1> 
  1967                              <1> ac97_codec_config:
  1968                              <1> 	; 10/06/2017
  1969                              <1> 	; 05/06/2017
  1970                              <1> 	; 29/05/2017
  1971                              <1> 	; 28/05/2017 (TRDOS 386, 'audio.s')
  1972                              <1> 	; 07/11/2016 (Erdogan Tan)
  1973                              <1> 	; Derived from 'codecConfig' procedure in 'CODEC.ASM'
  1974                              <1> 	; .wav player for DOS by Jeff Leyda (02/09/2002)
  1975                              <1> 
  1976                              <1> 	;; 'PLAYER.ASM'
  1977                              <1> 	;; get ICH base address regs for mixer and bus master
  1978                              <1> 
  1979                              <1> init_ac97_controller: ; 10/06/2017
  1980 00014DDB A1[18940100]        <1> 	mov	eax, [audio_dev_id]
  1981                              <1>         ;mov	al, NAMBAR_REG
  1982                              <1>         ;;call  pciRegRead16			; read PCI registers 10-11
  1983                              <1>         ;call	pciRegRead32
  1984                              <1> 	;and	dx, IO_ADDR_MASK 		; mask off BIT0
  1985                              <1> 	;;and	edx, IO_ADDR_MASK 
  1986                              <1> 
  1987                              <1>         ;mov	[NAMBAR], dx			; save audio mixer base addr
  1988                              <1> 
  1989                              <1>         ;mov    al, NABMBAR_REG
  1990                              <1>         ;;call	pciRegRead16
  1991                              <1>         ;call	pciRegRead32
  1992                              <1> 	;and	dx, 0FFC0h ; IO_ADDR_MASK
  1993                              <1> 	;;and	edx, 0FFC0h
  1994                              <1> 
  1995                              <1>         ;mov    [NABMBAR], dx			; save bus master base addr
  1996                              <1> 
  1997                              <1> 	;mov	eax, [audio_dev_id]
  1998 00014DE0 B004                <1>         mov     al, PCI_CMD_REG
  1999                              <1>         ;call	pciRegRead8			; read PCI command register
  2000 00014DE2 E84AF8FFFF          <1>         call	pciRegRead16
  2001 00014DE7 80CA05              <1> 	or      dl, IO_ENA+BM_ENA               ; enable IO and bus master
  2002                              <1>         ;call 	pciRegWrite8
  2003 00014DEA E8ADF8FFFF          <1> 	call	pciRegWrite16
  2004                              <1> 
  2005                              <1> 	; 'CODEC.ASM'
  2006                              <1> 
  2007                              <1> 	; enable codec, unmute stuff, set output rate
  2008                              <1> ;	; entry: [audio_freq] = desired sample rate
  2009                              <1> 		
  2010                              <1> ;	mov    	dx, [NAMBAR]               	
  2011                              <1> ;	add    	dx, CODEC_EXT_AUDIO_CTRL_REG  	; 2Ah  	  
  2012                              <1> ;	in     	ax, dx
  2013                              <1> ;	or	ax, 1
  2014                              <1> ;	out	dx, ax 				; Enable variable rate audio
  2015                              <1> 
  2016                              <1> ;       ;call    delay1_4ms
  2017                              <1> ;       ;call    delay1_4ms
  2018                              <1> ;       ;call    delay1_4ms
  2019                              <1> ;       ;call    delay1_4ms
  2020                              <1> 
  2021                              <1> ;	mov	ax, [audio_freq]		; sample rate
  2022                              <1> 
  2023                              <1> ;	mov    	dx, [NAMBAR]               	
  2024                              <1> ;	add    	dx, CODEC_PCM_FRONT_DACRATE_REG	; 2Ch  	  
  2025                              <1> ;	out	dx, ax 				; out sample rate
  2026                              <1> 		
  2027                              <1> ;       ;call	delay1_4ms
  2028                              <1> ;       ;call	delay1_4ms
  2029                              <1> ;       ;call	delay1_4ms
  2030                              <1> ;       ;call	delay1_4ms
  2031                              <1> 
  2032                              <1> 	;mov	dx, [NAMBAR]			; mixer base address
  2033                              <1>         ;add	dx, CODEC_RESET_REG  		; reset register
  2034                              <1>         ;mov	ax, 42
  2035                              <1> 	;out	dx, ax                          ; reset
  2036                              <1> 
  2037                              <1> 	;mov    dx, [NABMBAR]			; bus master base address
  2038                              <1>         ;add	dx, GLOB_STS_REG
  2039                              <1>         ;mov	ax, 2
  2040                              <1> 	;out	dx, ax                         
  2041                              <1> 
  2042 00014DEF E847F9FFFF          <1>         call    delay_100ms ; 29/05/2017
  2043                              <1> 
  2044                              <1> init_ac97_codec:
  2045                              <1> 	; 10/06/2017
  2046                              <1> 	; 29/05/2017
  2047                              <1> 	; 28/05/2017 - Erdogan Tan (Ref: KolibriOS, intelac97.asm)
  2048                              <1> 	;	
  2049 00014DF4 66BA2C00            <1> 	mov	dx, GLOB_CNT_REG ; 2Ch
  2050 00014DF8 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2051 00014DFF ED                  <1> 	in	eax, dx
  2052                              <1> 	; ?
  2053 00014E00 66BA3000            <1> 	mov	dx, GLOB_STS_REG ; 30h
  2054 00014E04 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2055 00014E0B ED                  <1> 	in	eax, dx
  2056                              <1> 
  2057 00014E0C 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh ; -1
  2058 00014E0F 744B                <1> 	je	short init_ac97_codec_err1
  2059                              <1> 
  2060 00014E11 A900030010          <1> 	test	eax, CTRL_ST_CREADY
  2061 00014E16 7507                <1> 	jnz	short _ac97_codec_ready
  2062                              <1> 
  2063 00014E18 E8EF020000          <1> 	call	reset_ac97_codec
  2064 00014E1D 723E                <1> 	jc	short init_ac97_codec_err2
  2065                              <1> 
  2066                              <1> _ac97_codec_ready:
  2067 00014E1F 668B15[48940100]    <1> 	mov	dx, [NAMBAR]
  2068                              <1> 	;add	dx, 0 ; ac_reg_0 ; reset register
  2069 00014E26 66EF                <1> 	out	dx, ax
  2070                              <1> 
  2071 00014E28 31C0                <1> 	xor	eax, eax ; 0
  2072 00014E2A 668B15[48940100]    <1> 	mov	dx, [NAMBAR]
  2073 00014E31 6683C226            <1> 	add	dx, CODEC_REG_POWERDOWN	
  2074 00014E35 66EF                <1> 	out	dx, ax
  2075                              <1> 
  2076                              <1> 	; 10/06/2017
  2077                              <1> 	; 29/05/2017
  2078                              <1> 	; wait for 1 second
  2079 00014E37 B9E8030000          <1> 	mov	ecx, 1000 ; 1000*0.25ms = 1s
  2080                              <1> _ac97_codec_rloop:
  2081 00014E3C E807F9FFFF          <1> 	call	delay1_4ms
  2082 00014E41 E802F9FFFF          <1> 	call	delay1_4ms
  2083 00014E46 E8FDF8FFFF          <1> 	call	delay1_4ms
  2084 00014E4B E8F8F8FFFF          <1> 	call	delay1_4ms
  2085                              <1> 	;mov	dx, [NAMBAR]
  2086                              <1> 	;add	dx, CODEC_REG_POWERDOWN
  2087 00014E50 66ED                <1> 	in	ax, dx	
  2088 00014E52 6683E00F            <1> 	and	ax, 0Fh
  2089 00014E56 3C0F                <1> 	cmp	al, 0Fh
  2090 00014E58 7404                <1> 	je	short _ac97_codec_init_ok
  2091 00014E5A E2E0                <1> 	loop	_ac97_codec_rloop 
  2092                              <1> 
  2093                              <1> init_ac97_codec_err1:
  2094 00014E5C F9                  <1> 	stc
  2095                              <1> init_ac97_codec_err2:
  2096 00014E5D C3                  <1> 	retn
  2097                              <1> 
  2098                              <1> _ac97_codec_init_ok:
  2099 00014E5E B002                <1>         mov     al, 2 ; force set 16-bit 2-channel PCM
  2100 00014E60 66BA2C00            <1> 	mov	dx, GLOB_CNT_REG ; 2Ch
  2101 00014E64 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2102 00014E6B EF                  <1> 	out	dx, eax
  2103                              <1> 
  2104                              <1> 	;call	delay1_4ms
  2105                              <1> 
  2106                              <1> 	; 10/06/2017
  2107 00014E6C E849020000          <1> 	call 	reset_ac97_controller
  2108                              <1> 
  2109                              <1> ;	call 	setup_ac97_codec
  2110                              <1> ;
  2111                              <1> ;detect_ac97_codec:
  2112                              <1> ;	retn
  2113                              <1> 
  2114                              <1> setup_ac97_codec:
  2115                              <1> 	; 22/07/2020
  2116                              <1> 	; 10/06/2017
  2117                              <1> 	; 29/05/2017
  2118 00014E71 B802020000          <1> 	mov     eax, 0202h
  2119 00014E76 66A3[46940100]      <1> 	mov	[audio_master_volume], ax
  2120 00014E7C 66B81F1F            <1> 	mov	ax, 1F1Fh ; 31, 31
  2121                              <1> 	
  2122 00014E80 668B15[48940100]    <1>   	mov     dx, [NAMBAR]
  2123 00014E87 6683C202            <1>   	add     dx, CODEC_MASTER_VOL_REG	;02h 
  2124 00014E8B 6631C0              <1>   	xor	ax, ax 	; volume attenuation = 0 (max. volume)
  2125 00014E8E 66EF                <1>   	out     dx, ax
  2126                              <1>  
  2127 00014E90 668B15[48940100]    <1>   	mov     dx, [NAMBAR]
  2128 00014E97 6683C206            <1>   	add     dx, CODEC_MASTER_MONO_VOL_REG	;06h 
  2129                              <1> 	;xor	ax, ax
  2130 00014E9B 66EF                <1>   	out     dx, ax
  2131                              <1> 
  2132 00014E9D 668B15[48940100]    <1>   	mov     dx, [NAMBAR]
  2133 00014EA4 6683C20A            <1>   	add     dx, CODEC_PCBEEP_VOL_REG	;0Ah 
  2134                              <1>   	;xor    ax, ax
  2135 00014EA8 66EF                <1>   	out     dx, ax
  2136                              <1> 
  2137 00014EAA 668B15[48940100]    <1>   	mov     dx, [NAMBAR]
  2138 00014EB1 6683C218            <1>   	add     dx, CODEC_PCM_OUT_REG		;18h 
  2139                              <1>   	;xor    ax, ax
  2140 00014EB5 66EF                <1>   	out     dx, ax
  2141                              <1> 
  2142 00014EB7 66B80880            <1> 	mov     ax, 8008h ; Mute
  2143 00014EBB 668B15[48940100]    <1>   	mov     dx, [NAMBAR]
  2144                              <1> 	; 22/07/2020
  2145 00014EC2 6683C20C            <1> 	add	dx, CODEC_PHONE_VOL_REG		;0Ch
  2146                              <1> 				 ; AC97_PHONE_VOL ; TAD Input (Mono)
  2147 00014EC6 66EF                <1>   	out     dx, ax
  2148                              <1> 
  2149 00014EC8 66B80808            <1>         mov	ax, 0808h
  2150 00014ECC 668B15[48940100]    <1>   	mov     dx, [NAMBAR]
  2151 00014ED3 6683C210            <1>         add	dx, CODEC_LINE_IN_VOL_REG ;10h ; Line Input (Stereo)	
  2152 00014ED7 66EF                <1>   	out     dx, ax
  2153                              <1> 
  2154                              <1> 	;mov	ax, 0808h
  2155 00014ED9 668B15[48940100]    <1>   	mov     dx, [NAMBAR]
  2156 00014EE0 6683C212            <1>         add	dx, CODEC_CD_VOL_REG ;12h ; CR Input (Stereo)
  2157 00014EE4 66EF                <1>   	out     dx, ax
  2158                              <1> 
  2159                              <1> 	;mov	ax, 0808h
  2160 00014EE6 668B15[48940100]    <1>   	mov     dx, [NAMBAR]
  2161 00014EED 6683C216            <1>         add	dx, CODEC_AUX_VOL_REG ;16h ; Aux Input (Stereo)
  2162 00014EF1 66EF                <1>   	out     dx, ax
  2163                              <1> 
  2164                              <1>         ;call    delay1_4ms
  2165                              <1>         ;call    delay1_4ms
  2166                              <1>         ;call    delay1_4ms
  2167                              <1>         ;call    delay1_4ms
  2168                              <1> 
  2169                              <1> detect_ac97_codec:
  2170 00014EF3 C3                  <1>         retn
  2171                              <1> 
  2172                              <1> set_ac97_bdl: ; Set AC97 (ICH) Buffer Descriptor List
  2173                              <1> 	; 17/06/2017
  2174                              <1> 	; 11/06/2017
  2175                              <1> 	; 28/05/2017
  2176                              <1> 	; eax = dma buffer address = [audio_DMA_buff]
  2177                              <1> 	; ecx = dma buffer buffer size = [audio_dmabuff_size]
  2178                              <1> 
  2179 00014EF4 D1E9                <1> 	shr	ecx, 1 ; dma half buffer size
  2180 00014EF6 89CE                <1> 	mov	esi, ecx
  2181                              <1> 
  2182 00014EF8 BF[4C940100]        <1>         mov     edi, audio_bdl_buff	; get BDL address
  2183 00014EFD B910000000          <1>         mov     ecx, 32 / 2		; make 32 entries in BDL
  2184                              <1> 
  2185 00014F02 EB05                <1> 	jmp	short s_ac97_bdl1 
  2186                              <1> 
  2187                              <1> s_ac97_bdl0:
  2188                              <1> 	; set buffer descriptor 0 to start of data file in memory
  2189                              <1> 
  2190 00014F04 A1[30940100]        <1>  	mov	eax, [audio_dma_buff]	; Physical address of DMA buffer
  2191                              <1>  
  2192                              <1> s_ac97_bdl1:
  2193 00014F09 AB                  <1> 	stosd				; store dmabuffer1 address
  2194                              <1> 
  2195 00014F0A 89C2                <1> 	mov	edx, eax
  2196                              <1> 
  2197                              <1> ;
  2198                              <1> ; Buffer Descriptors List
  2199                              <1> ; As stated earlier, each buffer descriptor list is a set of (up to) 32 
  2200                              <1> ; descriptors, each 8 bytes in length. Bytes 0-3 of a descriptor entry point
  2201                              <1> ; to a chunk of memory to either play from or record to. Bytes 4-7 of an
  2202                              <1> ; entry describe various control things detailed below.
  2203                              <1> ; 
  2204                              <1> ; Buffer pointers must always be aligned on a Dword boundry.
  2205                              <1> ;
  2206                              <1> ;
  2207                              <1> 
  2208                              <1> ;IOC                     equ     BIT31	; Fire an interrupt whenever this
  2209                              <1>                                         ; buffer is complete.
  2210                              <1> 
  2211                              <1> ;BUP                     equ     BIT30  ; Buffer Underrun Policy.
  2212                              <1>                                         ; if this buffer is the last buffer
  2213                              <1>                                         ; in a playback, fill the remaining
  2214                              <1>                                         ; samples with 0 (silence) or not.
  2215                              <1>                                         ; It's a good idea to set this to 1
  2216                              <1>                                         ; for the last buffer in playback,
  2217                              <1>                                         ; otherwise you're likely to get a lot
  2218                              <1>                                         ; of noise at the end of the sound.
  2219                              <1> 
  2220                              <1> ;
  2221                              <1> ; Bits 15:0 contain the length of the buffer, in number of samples, which
  2222                              <1> ; are 16 bits each, coupled in left and right pairs, or 32bits each.
  2223                              <1> ; Luckily for us, that's the same format as .wav files.
  2224                              <1> ;
  2225                              <1> ; A value of FFFF is 65536 samples. Running at 44.1Khz, that's just about
  2226                              <1> ; 1.5 seconds of sample time. FFFF * 32bits is 1FFFFh bytes or 128k of data.
  2227                              <1> ;
  2228                              <1> ; A value of 0 in these bits means play no samples.
  2229                              <1> ;
  2230                              <1> 
  2231 00014F0C 89F0                <1> 	mov	eax, esi ; DMA half buffer size
  2232 00014F0E 01C2                <1> 	add	edx, eax
  2233 00014F10 D1E8                <1> 	shr	eax, 1 ; count of 16 bit samples
  2234                              <1> 	;or	eax, IOC+BUP
  2235 00014F12 0D00000080          <1> 	or	eax, IOC ; 11/06/2017
  2236 00014F17 AB                  <1> 	stosd
  2237                              <1> 
  2238                              <1> ; 2nd buffer:
  2239                              <1> 
  2240 00014F18 89D0                <1>         mov	eax, edx ; Physical address of the 2nd half of DMA buffer	
  2241 00014F1A AB                  <1> 	stosd		 ; store dmabuffer2 address
  2242                              <1> 
  2243                              <1> ; set length to [audio_dmabuff_size]/2
  2244                              <1> ; Set control (bits 31:16) to BUP, bits 15:0=number of samples
  2245                              <1> ; 
  2246 00014F1B 89F0                <1> 	mov	eax, esi ; DMA half buffer size
  2247 00014F1D D1E8                <1> 	shr	eax, 1 ; count of 16 bit samples
  2248                              <1> 	;or	eax, IOC+BUP
  2249 00014F1F 0D00000080          <1> 	or	eax, IOC ; 11/06/2017
  2250 00014F24 AB                  <1> 	stosd
  2251                              <1> 
  2252 00014F25 E2DD                <1> 	loop    s_ac97_bdl0
  2253                              <1> 	
  2254 00014F27 C3                  <1> 	retn
  2255                              <1> 
  2256                              <1> ac97_start_play:  
  2257                              <1> 	; 28/05/2017
  2258                              <1> 	; Derived from 'playWav' procedure in 'ICHWAV.ASM'
  2259                              <1> 	; .wav player for DOS by Jeff Leyda (02/09/2002)
  2260                              <1> 
  2261                              <1> 	; set output rate
  2262                              <1> 	; entry: [audio_freq] = desired sample rate
  2263                              <1> 		
  2264 00014F28 668B15[48940100]    <1> 	mov    	dx, [NAMBAR]               	
  2265 00014F2F 6683C22A            <1> 	add    	dx, CODEC_EXT_AUDIO_CTRL_REG  	; 2Ah  	  
  2266 00014F33 66ED                <1> 	in     	ax, dx
  2267 00014F35 6683C801            <1> 	or	ax, 1
  2268 00014F39 66EF                <1> 	out	dx, ax 				; Enable variable rate audio
  2269                              <1> 
  2270                              <1>        ;call    delay1_4ms
  2271                              <1>        ;call    delay1_4ms
  2272                              <1>        ;call    delay1_4ms
  2273                              <1>        ;call    delay1_4ms
  2274                              <1> 
  2275 00014F3B 66A1[42940100]      <1> 	mov	ax, [audio_freq]		; sample rate
  2276                              <1> 
  2277 00014F41 668B15[48940100]    <1> 	mov    	dx, [NAMBAR]               	
  2278 00014F48 6683C22C            <1> 	add    	dx, CODEC_PCM_FRONT_DACRATE_REG	; 2Ch  	  
  2279 00014F4C 66EF                <1> 	out	dx, ax 				; out sample rate
  2280                              <1> 		
  2281                              <1>        ;call    delay1_4ms
  2282                              <1>        ;call    delay1_4ms
  2283                              <1>        ;call    delay1_4ms
  2284                              <1>        ;call    delay1_4ms
  2285                              <1> 
  2286                              <1> ;
  2287                              <1> ; register reset the DMA engine. This may cause a pop noise on the output
  2288                              <1> ; lines when the device is reset. Prolly a better idea to mute output, then
  2289                              <1> ; reset.
  2290                              <1> ;
  2291 00014F4E 668B15[4A940100]    <1>         mov     dx, [NABMBAR]
  2292 00014F55 6683C21B            <1>         add     dx, PO_CR_REG                  ; set pointer to Cntl reg
  2293 00014F59 B002                <1>         mov     al, RR                         ; set reset
  2294 00014F5B EE                  <1>         out     dx, al                         ; self clearing bit
  2295                              <1> ;
  2296                              <1> ;	mov	edi, audio_bdl_buff
  2297                              <1> ;	mov	edx, [audio_dmabuff_size]
  2298                              <1> ;	shr	edx, 1
  2299                              <1> ;	mov	ecx, 32/2
  2300                              <1> ;ac97_set_bdl_buffer:
  2301                              <1> ;	; 1st half of DMA buffer
  2302                              <1> ;	mov	eax, [audio_dma_buff]
  2303                              <1> ;	push	eax
  2304                              <1> ;	stosd
  2305                              <1> ;	mov	eax, edx ; dma buffer size / 2
  2306                              <1> ;	or	eax, IOC+BUP
  2307                              <1> ;	stosd
  2308                              <1> ;	pop	eax
  2309                              <1> ;	; 2nd half of DMA buffer
  2310                              <1> ;	add	eax, edx
  2311                              <1> ;	stosd
  2312                              <1> ;	mov	eax, edx ; dma buffer size / 2
  2313                              <1> ;	or	eax, IOC+BUP
  2314                              <1> ;	stosd
  2315                              <1> ;	loop	ac97_set_bdl_buffer
  2316                              <1>  	
  2317                              <1> ; tell the DMA engine where to find our list of Buffer Descriptors.
  2318                              <1> ; this 32bit value is a flat mode memory offset (ie no segment:offset)
  2319                              <1> ;
  2320                              <1> ; write NABMBAR+10h with offset of buffer descriptor list
  2321                              <1> ;
  2322 00014F5C B8[4C940100]        <1>         mov	eax, audio_bdl_buff
  2323 00014F61 668B15[4A940100]    <1> 	mov	dx, [NABMBAR]
  2324 00014F68 6683C210            <1> 	add	dx, PO_BDBAR_REG
  2325 00014F6C EF                  <1> 	out	dx, eax
  2326                              <1> ;
  2327                              <1> ; All set. Let's play some music.
  2328                              <1> ;
  2329                              <1> ;
  2330 00014F6D B81F000000          <1> 	mov	eax, 31
  2331 00014F72 E816000000          <1> 	call    set_ac97_LastValidIndex
  2332                              <1> 
  2333 00014F77 C605[44940100]01    <1> 	mov	byte [audio_play_cmd], 1 ; play command (do not stop) !
  2334                              <1> 
  2335                              <1> ac97_play: ; continue to play (after pause)
  2336                              <1> 	; 11/06/2017
  2337                              <1> 	; 29/05/2017
  2338                              <1> 	; 28/05/2017
  2339 00014F7E 668B15[4A940100]    <1>         mov     dx, [NABMBAR]
  2340 00014F85 6683C21B            <1>         add     dx, PO_CR_REG		; PCM out control register
  2341 00014F89 B011                <1>         mov	al, IOCE+RPBM ; 29/05/2017
  2342                              <1>         ;mov	al, 1Dh ; (Ref: KolibriOS, intelac97.asm, 'play:')
  2343 00014F8B EE                  <1> 	out     dx, al			; set start!
  2344                              <1> 
  2345                              <1> 	;mov	byte [audio_play_cmd], 1 ; play command (do not stop) !
  2346                              <1> 
  2347 00014F8C C3                  <1> 	retn
  2348                              <1> 
  2349                              <1> ;input AL = index # to stop on
  2350                              <1> set_ac97_LastValidIndex:
  2351                              <1> 	; 28/05/2017
  2352                              <1> 	; Derived from 'setLastValidIndex' procedure in 'ICHWAV.ASM'
  2353                              <1> 	; .wav player for DOS by Jeff Leyda (02/09/2002)
  2354 00014F8D 668B15[4A940100]    <1> 	mov	dx, [NABMBAR]
  2355 00014F94 6683C215            <1> 	add	dx, PO_LVI_REG
  2356 00014F98 EE                  <1>         out     dx, al
  2357                              <1> 	;mov	[audio_lvi], al ; for ac97_int_handler
  2358 00014F99 C3                  <1> 	retn
  2359                              <1> 
  2360                              <1> ac97_volume:
  2361                              <1> 	; 28/05/2017
  2362                              <1> 	; bl = component (0 = master/playback/lineout volume)
  2363                              <1> 	; cl = left channel volume level (0 to 31)
  2364                              <1> 	; ch = right channel volume level (0 to 31)
  2365                              <1> 
  2366 00014F9A 08DB                <1> 	or	bl, bl
  2367 00014F9C 7523                <1> 	jnz	short ac97_vol_1 ; temporary !
  2368 00014F9E 66B81F1F            <1> 	mov	ax, 1F1Fh ; 31,31
  2369 00014FA2 38C1                <1> 	cmp	cl, al
  2370 00014FA4 771B                <1> 	ja	short ac97_vol_1 ; temporary !
  2371 00014FA6 38E5                <1> 	cmp	ch, ah
  2372 00014FA8 7717                <1> 	ja	short ac97_vol_1 ; temporary !
  2373 00014FAA 66890D[46940100]    <1> 	mov	[audio_master_volume], cx
  2374 00014FB1 6629C8              <1> 	sub	ax, cx
  2375 00014FB4 668B15[48940100]    <1>   	mov     dx, [NAMBAR]
  2376 00014FBB 6683C202            <1>   	add     dx, CODEC_MASTER_VOL_REG  ; 02h ; Line Out 
  2377 00014FBF 66EF                <1>   	out     dx, ax
  2378                              <1> ac97_vol_1:
  2379 00014FC1 C3                  <1> 	retn
  2380                              <1> 
  2381                              <1> ac97_int_handler:
  2382                              <1> 	; 12/10/2017
  2383                              <1> 	; 10/10/2017
  2384                              <1> 	; 09/10/2017
  2385                              <1> 	; 13/06/2017, 13/06/2017
  2386                              <1> 	; 10/06/2017, 11/06/2017
  2387                              <1> 	; Interrupt Handler for AC97 (ICH) Audio Controller
  2388                              <1> 	; Note: called by 'dev_IRQ_service' 
  2389                              <1> 	; 28/05/2017
  2390                              <1> 
  2391                              <1> 	;push	eax ; * must be saved !
  2392                              <1> 	;push	edx
  2393                              <1> 	;push	ecx
  2394                              <1> 	;push	ebx ; * must be saved !
  2395                              <1> 	;push	esi
  2396                              <1> 	;push	edi
  2397                              <1> 
  2398                              <1> 	;cmp	byte [audio_busy], 1
  2399                              <1> 	;jnb	_ac97_ih2	; busy !
  2400                              <1> 
  2401 00014FC2 66BA3000            <1>         mov     dx, GLOB_STS_REG
  2402 00014FC6 660315[4A940100]    <1>         add	dx, [NABMBAR]
  2403 00014FCD ED                  <1> 	in	eax, dx
  2404                              <1> 
  2405 00014FCE 83F8FF              <1>         cmp     eax, 0FFFFFFFFh ; -1
  2406 00014FD1 0F849A000000        <1>         je      _ac97_ih3 ; exit
  2407                              <1> 
  2408 00014FD7 A940000000          <1>         test    eax, 40h ; PCM Out Interrupt
  2409 00014FDC 750E                <1>         jnz     short _ac97_ih0
  2410                              <1> 
  2411 00014FDE 85C0                <1> 	test	eax, eax
  2412 00014FE0 0F848B000000        <1> 	jz	_ac97_ih3 ; exit
  2413                              <1> 
  2414                              <1>  	;mov	dx, GLOB_STS_REG
  2415                              <1>         ;add	dx, [NABMBAR]
  2416 00014FE6 EF                  <1> 	out	dx, eax
  2417                              <1> 
  2418 00014FE7 E985000000          <1> 	jmp	_ac97_ih3 ; exit
  2419                              <1> 
  2420                              <1> _ac97_ih0:
  2421 00014FEC 50                  <1> 	push	eax
  2422                              <1> 	; 09/10/2017
  2423 00014FED 803D[44940100]01    <1> 	cmp	byte [audio_play_cmd], 1
  2424 00014FF4 727C                <1> 	jb	short _ac97_ih4 ; stop command !
  2425                              <1> 
  2426                              <1> 	;mov	byte [audio_busy], 1
  2427                              <1> 
  2428                              <1> 	;mov	al, 10h
  2429                              <1> 	;mov	dx, PO_CR_REG
  2430                              <1>         ;add	dx, [NABMBAR]
  2431                              <1> 	;out	dx, al
  2432                              <1> 
  2433 00014FF6 66B81C00            <1> 	mov	ax, 1Ch ; FIFOE(=16)+BCIS(=8)+LVBCI(=4)
  2434 00014FFA 66BA1600            <1> 	mov	dx, PO_SR_REG
  2435 00014FFE 660315[4A940100]    <1>         add	dx, [NABMBAR]
  2436 00015005 66EF                <1> 	out	dx, ax
  2437                              <1> 
  2438 00015007 66BA1400            <1> 	mov	dx, PO_CIV_REG
  2439 0001500B 660315[4A940100]    <1>         add	dx, [NABMBAR]
  2440 00015012 EC                  <1> 	in	al, dx
  2441                              <1> 
  2442                              <1> 	;cmp	al, [audio_civ] ; [audio_flag]
  2443                              <1> 	;je	short _ac97_ih2
  2444                              <1> 
  2445 00015013 A2[45940100]        <1> 	mov	[audio_civ], al
  2446 00015018 FEC8                <1> 	dec	al
  2447                              <1> 	;inc	al ; 11/06/2017
  2448 0001501A 241F                <1> 	and	al, 1Fh
  2449                              <1> 
  2450 0001501C 66BA1500            <1>         mov     dx, PO_LVI_REG
  2451 00015020 660315[4A940100]    <1>         add	dx, [NABMBAR]
  2452 00015027 EE                  <1>         out	dx, al
  2453                              <1> 
  2454                              <1> 	; 12/10/2017
  2455 00015028 A0[45940100]        <1> 	mov	al, [audio_civ]
  2456 0001502D FEC0                <1> 	inc	al
  2457 0001502F 2401                <1> 	and	al, 1
  2458 00015031 A2[38940100]        <1> 	mov	[audio_flag], al 
  2459                              <1> 	;; [audio_flag] : 0 = Buffer 1, 1 = Buffer 2
  2460                              <1> 	;
  2461 00015036 58                  <1> 	pop	eax
  2462                              <1> 	;
  2463 00015037 83E040              <1> 	and     eax, 40h
  2464 0001503A 668B15[4A940100]    <1>         mov	dx, [NABMBAR]
  2465 00015041 6683C230            <1> 	add	dx, GLOB_STS_REG
  2466 00015045 EF                  <1> 	out	dx, eax
  2467                              <1> 
  2468                              <1> 	;; 13/06/2017
  2469                              <1> 	;mov	al, 11h ; IOCE + RPBM
  2470                              <1> 	;mov	dx, PO_CR_REG
  2471                              <1>         ;add	dx, [NABMBAR]
  2472                              <1> 	;out	dx, al
  2473                              <1> 
  2474                              <1> ac97_tuneloop:
  2475                              <1> 	; 09/10/2017
  2476 00015046 8B3D[30940100]      <1> 	mov	edi, [audio_dma_buff]
  2477 0001504C 8B0D[34940100]      <1> 	mov	ecx, [audio_dmabuff_size]
  2478 00015052 D1E9                <1> 	shr	ecx, 1 ; dma buff size / 2 = half buffer size
  2479                              <1> 
  2480                              <1> 	; 12/10/2017
  2481 00015054 803D[38940100]00    <1> 	cmp 	byte [audio_flag], 0
  2482 0001505B 7702                <1> 	ja	short _ac97_ih1  ; Playing Half Buffer 2 (Current: FLAG)
  2483                              <1> 	; Playing Half Buffer 1 (Current: EOL)	
  2484 0001505D 01CF                <1> 	add	edi, ecx
  2485                              <1> _ac97_ih1: 
  2486                              <1> 	; Update half buffer 2 while playing half buffer 1 (next: FLAG)
  2487                              <1> 	; Update half buffer 1 while playing half buffer 2 (next: EOL)
  2488                              <1> 
  2489 0001505F 8B35[28940100]      <1> 	mov	esi, [audio_p_buffer] ; phy addr of audio buff
  2490 00015065 C1E902              <1> 	shr	ecx, 2 ; half buff size / 4
  2491 00015068 F3A5                <1> 	rep	movsd 
  2492                              <1> 
  2493                              <1> 	; 10/10/2017
  2494                              <1> 	; switch flag value
  2495 0001506A 8035[38940100]01    <1> 	xor	byte [audio_flag], 1
  2496                              <1> 	; 12/10/2017
  2497                              <1> 	; [audio_flag] = 0 : Playing dma half buffer 2 (even index value)
  2498                              <1> 			   ; Next buffer (to update) is dma half buff 1
  2499                              <1> 	; 	       = 1 : Playing dma half buffer 1 (odd index value)
  2500                              <1> 			   ; Next buffer (to update) is dma half buff 2
  2501                              <1> 
  2502                              <1> _ac97_ih2:
  2503                              <1> 	;mov	byte [audio_busy], 0
  2504                              <1> _ac97_ih3:
  2505                              <1> 	;pop	edi
  2506                              <1> 	;pop	esi
  2507                              <1> 	;pop	ebx ; * must be restored !
  2508                              <1> 	;pop	ecx
  2509                              <1> 	;pop	edx
  2510                              <1> 	;pop	eax ; * must be restored !
  2511                              <1> 
  2512 00015071 C3                  <1> 	retn
  2513                              <1> 
  2514                              <1> _ac97_ih4:
  2515                              <1> 	; 09/10/2017
  2516 00015072 E818000000          <1> 	call	_ac97_stop
  2517                              <1> 	;
  2518 00015077 58                  <1> 	pop	eax
  2519                              <1> 	;
  2520 00015078 83E040              <1> 	and     eax, 40h
  2521 0001507B 668B15[4A940100]    <1>         mov	dx, [NABMBAR]
  2522 00015082 6683C230            <1> 	add	dx, GLOB_STS_REG
  2523 00015086 EF                  <1> 	out	dx, eax
  2524                              <1> 
  2525                              <1> 	;; 13/06/2017
  2526                              <1> 	;mov	al, 11h ; IOCE + RPBM
  2527                              <1> 	;dx, PO_CR_REG
  2528                              <1>         ;add	dx, [NABMBAR]
  2529                              <1> 	;out	dx, al
  2530                              <1> 
  2531                              <1> 	; 10/10/2017
  2532                              <1> 	;jmp	short _ac97_ih3  ; exit
  2533 00015087 C3                  <1> 	retn
  2534                              <1> 
  2535                              <1> ac97_stop: 
  2536                              <1> 	; 28/05/2017
  2537 00015088 C605[44940100]00    <1> 	mov	byte [audio_play_cmd], 0 ; stop !
  2538                              <1> _ac97_stop: ; 09/10/2017
  2539                              <1> 	; 29/05/2017
  2540                              <1> 	;mov	dx, [NABMBAR]
  2541                              <1> 	;add	dx, PO_CR_REG
  2542                              <1> 	;mov	al, 0
  2543                              <1> 	;out	dx, al
  2544                              <1> 
  2545                              <1> 	; 11/06/2017
  2546 0001508F 30C0                <1> 	xor	al, al ; 0
  2547 00015091 E813000000          <1> 	call	ac97_po_cmd
  2548                              <1> 
  2549                              <1> 	; (Ref: KolibriOS, intelac97.asm, 'stop:')
  2550                              <1> 	; Clear FIFOE, BCIS, LVBCI (Ref: Intel ICH hub manual)
  2551 00015096 66B81C00            <1> 	mov     ax, 1Ch
  2552 0001509A 668B15[4A940100]    <1> 	mov     dx, [NABMBAR]
  2553 000150A1 6683C216            <1> 	add     dx, PO_SR_REG
  2554 000150A5 66EF                <1> 	out     dx, ax
  2555                              <1> 
  2556                              <1> 	;retn
  2557                              <1> 
  2558                              <1> 	; 11/06/2017
  2559 000150A7 B002                <1> 	mov     al, RR
  2560                              <1> ac97_po_cmd:
  2561                              <1> 	 ;11/06/2017
  2562                              <1> 	; 29/05/2017
  2563 000150A9 668B15[4A940100]    <1> 	mov     dx, [NABMBAR]
  2564 000150B0 6683C21B            <1>         add     dx, PO_CR_REG		; PCM out control register
  2565 000150B4 EE                  <1> 	out	dx, al
  2566 000150B5 C3                  <1> 	retn
  2567                              <1> 
  2568                              <1> ac97_pause:
  2569                              <1> 	; 11/06/2017
  2570                              <1> 	; 29/05/2017
  2571 000150B6 B010                <1> 	mov 	al, IOCE
  2572 000150B8 EBEF                <1> 	jmp	short ac97_po_cmd
  2573                              <1> 
  2574                              <1> reset_ac97_controller:
  2575                              <1> 	; 10/06/2017
  2576                              <1> 	; 29/05/2017
  2577                              <1> 	; 28/05/2017
  2578                              <1> 	; reset AC97 audio controller registers
  2579 000150BA 31C0                <1> 	xor     eax, eax
  2580 000150BC 66BA0B00            <1>         mov	dx, PI_CR_REG
  2581 000150C0 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2582 000150C7 EE                  <1> 	out     dx, al
  2583                              <1> 
  2584 000150C8 66BA1B00            <1>         mov     dx, PO_CR_REG
  2585 000150CC 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2586 000150D3 EE                  <1> 	out     dx, al
  2587                              <1> 
  2588 000150D4 66BA2B00            <1>         mov     dx, MC_CR_REG
  2589 000150D8 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2590 000150DF EE                  <1> 	out     dx, al
  2591                              <1> 
  2592 000150E0 B002                <1>         mov     al, RR
  2593 000150E2 66BA0B00            <1>         mov     dx, PI_CR_REG
  2594 000150E6 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2595 000150ED EE                  <1> 	out     dx, al
  2596                              <1> 
  2597 000150EE 66BA1B00            <1>         mov     dx, PO_CR_REG
  2598 000150F2 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2599 000150F9 EE                  <1> 	out     dx, al
  2600                              <1> 
  2601 000150FA 66BA2B00            <1>         mov     dx, MC_CR_REG
  2602 000150FE 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2603 00015105 EE                  <1> 	out     dx, al
  2604                              <1> 
  2605 00015106 C3                  <1> 	retn
  2606                              <1> 
  2607                              <1> ac97_reset:
  2608                              <1> 	; 10/06/2017
  2609                              <1> 	; 29/05/2017
  2610                              <1> 	; 28/05/2017
  2611 00015107 E8AEFFFFFF          <1> 	call	reset_ac97_controller
  2612                              <1> 	; 29/05/2017
  2613                              <1> 	;jmp	reset_ac97_codec
  2614                              <1> reset_ac97_codec:
  2615                              <1> 	; 28/05/2017 - Erdogan Tan (Ref: KolibriOS, intelac97.asm)
  2616 0001510C 66BA2C00            <1> 	mov	dx, GLOB_CNT_REG ; 2Ch
  2617 00015110 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2618 00015117 ED                  <1> 	in	eax, dx
  2619                              <1> 
  2620 00015118 A902000000          <1> 	test	eax, 2
  2621 0001511D 7407                <1> 	jz	short _r_ac97codec_cold	
  2622                              <1> 
  2623 0001511F E80F000000          <1> 	call	warm_ac97codec_reset
  2624 00015124 7308                <1> 	jnc	short _r_ac97codec_ok
  2625                              <1> _r_ac97codec_cold:
  2626 00015126 E83D000000          <1>         call    cold_ac97codec_reset
  2627 0001512B 7301                <1>         jnc     short _r_ac97codec_ok
  2628                              <1> 	
  2629                              <1> 	; 16/04/2017
  2630                              <1>         ;xor     eax, eax         ; timeout error
  2631                              <1>        	;stc
  2632 0001512D C3                  <1> 	retn
  2633                              <1> 
  2634                              <1> _r_ac97codec_ok:
  2635 0001512E 31C0                <1>         xor     eax, eax
  2636                              <1>         ;mov	al, VIA_ACLINK_C00_READY ; 1
  2637 00015130 FEC0                <1>         inc	al
  2638 00015132 C3                  <1> 	retn
  2639                              <1> 
  2640                              <1> warm_ac97codec_reset:
  2641                              <1> 	; 28/05/2017 - Erdogan Tan (Ref: KolibriOS, intelac97.asm)
  2642 00015133 B806000000          <1>         mov     eax, 6
  2643 00015138 66BA2C00            <1> 	mov	dx, GLOB_CNT_REG ; 2Ch
  2644 0001513C 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2645 00015143 EF                  <1> 	out	dx, eax
  2646                              <1> 
  2647 00015144 B90A000000          <1> 	mov	ecx, 10	; total 1s
  2648                              <1> _warm_ac97c_rst_wait:
  2649 00015149 51                  <1> 	push	ecx
  2650 0001514A E8ECF5FFFF          <1> 	call	delay_100ms
  2651 0001514F 59                  <1> 	pop	ecx
  2652                              <1> 
  2653 00015150 66BA3000            <1> 	mov	dx, GLOB_STS_REG ; 30h
  2654 00015154 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2655 0001515B ED                  <1> 	in	eax, dx
  2656                              <1> 
  2657 0001515C A900030010          <1> 	test	eax, CTRL_ST_CREADY
  2658 00015161 7504                <1> 	jnz	short _warm_ac97c_rst_ok
  2659                              <1> 
  2660 00015163 49                  <1>         dec     ecx
  2661 00015164 75E3                <1>         jnz     short _warm_ac97c_rst_wait
  2662                              <1> 
  2663                              <1> _warm_ac97c_rst_fail:
  2664 00015166 F9                  <1>         stc
  2665                              <1> _warm_ac97c_rst_ok:
  2666 00015167 C3                  <1> 	retn
  2667                              <1> 
  2668                              <1> cold_ac97codec_reset:
  2669                              <1> 	; 28/05/2017 - Erdogan Tan (Ref: KolibriOS, intelac97.asm)
  2670 00015168 B802000000          <1>         mov     eax, 2
  2671 0001516D 66BA2C00            <1> 	mov	dx, GLOB_CNT_REG ; 2Ch
  2672 00015171 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2673 00015178 EF                  <1> 	out	dx, eax
  2674                              <1> 
  2675 00015179 E8BDF5FFFF          <1> 	call	delay_100ms 	; wait 100 ms
  2676 0001517E E8B8F5FFFF          <1> 	call	delay_100ms 	; wait 100 ms
  2677 00015183 E8B3F5FFFF          <1> 	call	delay_100ms 	; wait 100 ms
  2678 00015188 E8AEF5FFFF          <1> 	call	delay_100ms 	; wait 100 ms
  2679                              <1> 
  2680 0001518D B910000000          <1> 	mov	ecx, 16	; total 20*100 ms = 2s
  2681                              <1> _cold_ac97c_rst_wait:
  2682 00015192 66BA3000            <1> 	mov	dx, GLOB_STS_REG ; 30h
  2683 00015196 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2684 0001519D ED                  <1> 	in	eax, dx
  2685                              <1> 
  2686 0001519E A900030010          <1> 	test	eax, CTRL_ST_CREADY
  2687 000151A3 750B                <1> 	jnz	short _cold_ac97c_rst_ok
  2688                              <1> 
  2689 000151A5 51                  <1> 	push	ecx
  2690 000151A6 E890F5FFFF          <1> 	call	delay_100ms
  2691 000151AB 59                  <1> 	pop	ecx
  2692                              <1> 
  2693 000151AC 49                  <1>         dec     ecx
  2694 000151AD 75E3                <1>         jnz     short _cold_ac97c_rst_wait
  2695                              <1> 
  2696                              <1> _cold_ac97c_rst_fail:
  2697 000151AF F9                  <1>         stc
  2698                              <1> _cold_ac97c_rst_ok:
  2699 000151B0 C3                  <1> 	retn
  2700                              <1> 
  2701                              <1> sb16_current_sound_data:
  2702                              <1> 	; 20/08/2017
  2703                              <1> 	; 24/06/2017
  2704                              <1> 	; 22/06/2017
  2705                              <1> 	; get current sound (PCM out) data for graphics
  2706                              <1> 	; (for Sound Blaster 16)
  2707                              <1> 	; ebx = Physical address (on page boundary)
  2708                              <1> 	; ecx = Byte count
  2709                              <1> 	; [audio_buff_size]
  2710                              <1> 
  2711                              <1> 	;;mov	edi, [audio_buff_size]
  2712                              <1> 	;mov	edi, [audio_dmabuff_size]
  2713                              <1> 	;mov	esi, [audio_dma_buff]
  2714 000151B1 39CF                <1> 	cmp	edi, ecx
  2715 000151B3 7302                <1> 	jnb	short sb16_gcd_0
  2716 000151B5 89F9                <1> 	mov	ecx, edi
  2717                              <1> sb16_gcd_0:
  2718                              <1> 	; 20/08/2017
  2719 000151B7 803D[40940100]10    <1> 	cmp	byte [audio_bps], 16
  2720 000151BE 750F                <1> 	jne	short sb16_gcd_1 ; 8 bit DMA channel
  2721 000151C0 E4C6                <1> 	in	al, 0C6h ; DMA channel 5 count register
  2722 000151C2 88C2                <1> 	mov	dl, al	
  2723 000151C4 E4C6                <1> 	in	al, 0C6h
  2724 000151C6 88C6                <1> 	mov     dh, al
  2725 000151C8 0FB7C2              <1> 	movzx	eax, dx
  2726 000151CB D1E0                <1> 	shl	eax, 1 ; word count -> byte count
  2727 000151CD EB4E                <1> 	jmp	short sb16_gcd_2	
  2728                              <1> sb16_gcd_1:
  2729 000151CF E403                <1> 	in	al, 03h ; DMA channel 1 count register
  2730 000151D1 88C2                <1> 	mov	dl, al	
  2731 000151D3 E403                <1> 	in	al, 03h
  2732 000151D5 88C6                <1> 	mov     dh, al
  2733 000151D7 0FB7C2              <1> 	movzx	eax, dx
  2734 000151DA EB41                <1> 	jmp	short sb16_gcd_2
  2735                              <1> ;sb16_gcd_2:	
  2736                              <1> ;	cmp	eax, ecx
  2737                              <1> ;	jnb	short sb16_gcd_3 
  2738                              <1> ;	; remain count < graphics bytes
  2739                              <1> ;	mov	eax, ecx ; fix remain count to data size
  2740                              <1> ;sb16_gcd_3:	
  2741                              <1> ;	sub	edi, eax
  2742                              <1> ;	jna	short sb16_gcd_4
  2743                              <1> ;	add	esi, edi ; dma buffer offset
  2744                              <1> ;sb16_gcd_4:
  2745                              <1> ;	mov	edi, ebx ; buffer address (for graphics) 
  2746                              <1> ;	mov	[u.r0], ecx
  2747                              <1> ;	rep	movsb
  2748                              <1> ;	retn
  2749                              <1> 
  2750                              <1> get_current_sound_data:
  2751                              <1> 	; 24/06/2017
  2752                              <1> 	; 22/06/2017
  2753                              <1> 	; get current sound (PCM out) data for graphics
  2754                              <1> 	;
  2755                              <1> 	; ebx = Physical address (on page boundary)
  2756                              <1> 	; ecx = Byte count
  2757                              <1> 	; [audio_buff_size]
  2758                              <1> 
  2759                              <1> 	;mov	edi, [audio_buff_size]
  2760 000151DC 8B3D[34940100]      <1> 	mov	edi, [audio_dmabuff_size]
  2761 000151E2 8B35[30940100]      <1> 	mov	esi, [audio_dma_buff]
  2762 000151E8 803D[11940100]02    <1> 	cmp	byte [audio_device], 2
  2763 000151EF 72C0                <1> 	jb	short sb16_current_sound_data ; = 1
  2764 000151F1 D1EF                <1> 	shr	edi, 1
  2765 000151F3 39CF                <1> 	cmp	edi, ecx
  2766 000151F5 7302                <1> 	jnb	short gcd_0
  2767 000151F7 89F9                <1> 	mov	ecx, edi
  2768                              <1> gcd_0:
  2769 000151F9 803D[11940100]03    <1> 	cmp	byte [audio_device], 3
  2770 00015200 7232                <1> 	jb	short ac97_current_sound_data ; = 2
  2771                              <1> 	; = 3
  2772                              <1> vt8233_current_sound_data:
  2773                              <1> 	; 22/06/2017
  2774                              <1> 	; 21/06/2017
  2775                              <1> 	; get current sound (PCM out) data for graphics
  2776                              <1> 	; (for VT 8233, VT 8237R)
  2777                              <1> 	; ebx = Physical address (on page boundary)
  2778                              <1> 	; ecx = Byte count
  2779                              <1> 	; [audio_buff_size]
  2780                              <1> 	
  2781                              <1> 	;;mov	edi, [audio_buff_size]
  2782                              <1> 	;mov	edi, [audio_dmabuff_size]
  2783                              <1> 	;mov	esi, [audio_dma_buff]
  2784                              <1> 	;shr	edi, 1
  2785                              <1> 	;cmp	edi, ecx
  2786                              <1> 	;jnb	short vt8233_gcd_1
  2787                              <1> 	;mov	ecx, edi
  2788                              <1> vt8233_gcd_1:
  2789 00015202 BA0C000000          <1> 	mov	edx, VIA_REG_OFFSET_CURR_COUNT
  2790 00015207 E88FF5FFFF          <1> 	call	ctrl_io_r32
  2791 0001520C 89C2                <1> 	mov	edx, eax ; remain count (bits 23-0),
  2792                              <1> 			 ; SGD index (bits 31-24) 
  2793 0001520E 81E200000001        <1> 	and	edx, 1000000h ; SGD index (0 = 1st half)
  2794 00015214 7402                <1> 	jz	short vt8233_gcd_2
  2795                              <1> 	; the second half of DMA buffer
  2796 00015216 01FE                <1> 	add	esi, edi 
  2797                              <1> vt8233_gcd_2:	
  2798 00015218 25FFFFFF00          <1> 	and	eax, 0FFFFFFh ; bits 23-0
  2799                              <1> ac97_gcd_2:
  2800                              <1> sb16_gcd_2:
  2801 0001521D 39C8                <1> 	cmp	eax, ecx
  2802 0001521F 7302                <1> 	jnb	short vt8233_gcd_3 
  2803                              <1> 	; remain count < graphics bytes
  2804 00015221 89C8                <1> 	mov	eax, ecx ; fix remain count to data size
  2805                              <1> vt8233_gcd_3:
  2806 00015223 29C7                <1> 	sub	edi, eax
  2807 00015225 7602                <1> 	jna	short vt8233_gcd_4
  2808 00015227 01FE                <1> 	add	esi, edi ; dma buffer offset
  2809                              <1> vt8233_gcd_4:
  2810 00015229 89DF                <1> 	mov	edi, ebx ; buffer address (for graphics) 
  2811 0001522B 890D[64030300]      <1> 	mov	[u.r0], ecx
  2812 00015231 F3A4                <1> 	rep	movsb
  2813                              <1> vt8233_gcd_5:
  2814 00015233 C3                  <1> 	retn
  2815                              <1> 
  2816                              <1> ac97_current_sound_data:
  2817                              <1> 	; 23/06/2017
  2818                              <1> 	; 22/06/2017
  2819                              <1> 	; get current sound (PCM out) data for graphics
  2820                              <1> 	; (for AC'97, ICH)
  2821                              <1> 	; ebx = Physical address (on page boundary)
  2822                              <1> 	; ecx = Byte count
  2823                              <1> 	; [audio_buff_size]
  2824                              <1> 	
  2825                              <1> 	;;mov	edi, [audio_buff_size]
  2826                              <1> 	;mov	edi, [audio_dmabuff_size]
  2827                              <1> 	;mov	esi, [audio_dma_buff]
  2828                              <1> 	;shr	edi, 1
  2829                              <1> 	;cmp	edi, ecx
  2830                              <1> 	;jnb	short ac97_gcd_0
  2831                              <1> 	;mov	ecx, edi
  2832                              <1> ac97_gcd_0:
  2833 00015234 66BA1400            <1> 	mov	dx, PO_CIV_REG ; Position In Current Buff Reg
  2834 00015238 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2835 0001523F EC                  <1> 	in	al, dx ; current index value
  2836 00015240 A801                <1> 	test	al, 1
  2837 00015242 7402                <1> 	jz	short ac97_gcd_1
  2838 00015244 01FE                <1> 	add	esi, edi
  2839                              <1> ac97_gcd_1:
  2840 00015246 31C0                <1> 	xor	eax, eax
  2841 00015248 66BA1800            <1> 	mov	dx, PO_PICB_REG ; Position In Current Buff Reg
  2842 0001524C 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2843 00015253 66ED                <1> 	in	ax, dx ; remain dwords
  2844 00015255 C1E002              <1> 	shl	eax, 2 ; remain bytes ; 23/06/2017 
  2845 00015258 EBC3                <1> 	jmp	short ac97_gcd_2
  2846                              <1> ;	cmp	eax, ecx
  2847                              <1> ;	jnb	short ac97_gcd_2 
  2848                              <1> ;	; remain count < graphics bytes
  2849                              <1> ;	mov	eax, ecx ; fix remain count to data size
  2850                              <1> ;ac97_gcd_2:	
  2851                              <1> ;	sub	edi, eax
  2852                              <1> ;	jna	short ac97_gcd_3
  2853                              <1> ;	add	esi, edi ; dma buffer offset
  2854                              <1> ;ac97_gcd_3:
  2855                              <1> ;	mov	edi, ebx ; buffer address (for graphics) 
  2856                              <1> ;	mov	[u.r0], ecx
  2857                              <1> ;	rep	movsb
  2858                              <1> ;	retn
  2859                              <1> 
  2860                              <1> sb16_get_dma_buff_off:
  2861                              <1> 	; 28/10/2017
  2862                              <1> 	; 24/06/2017
  2863                              <1> 	; 22/06/2017
  2864                              <1> 	; get current (PCM OUT DMA buffer) pointer
  2865                              <1> 	; (for Sound Blaster 16)
  2866                              <1> 
  2867                              <1> 	;mov	ecx, [audio_dmabuff_size]
  2868                              <1> 	;xor	ebx, ebx
  2869                              <1> 	;shr	ecx, 1
  2870                              <1> sb16_gdmabo_0:
  2871                              <1> 	; 28/10/2017
  2872 0001525A 803D[40940100]10    <1> 	cmp	byte [audio_bps], 16
  2873 00015261 750F                <1> 	jne	short sb16_gdmabo_1 ; 8 bit DMA channel
  2874                              <1> 	; 16 bit DMA channel
  2875 00015263 E4C6                <1> 	in	al, 0C6h ; DMA channel 5 count register
  2876 00015265 88C2                <1> 	mov	dl, al	
  2877 00015267 E4C6                <1> 	in	al, 0C6h
  2878 00015269 88C6                <1> 	mov     dh, al
  2879 0001526B 0FB7C2              <1> 	movzx	eax, dx
  2880 0001526E D1E0                <1> 	shl	eax, 1 ; word count -> byte count
  2881 00015270 EB3D                <1> 	jmp	short sb16_gdmabo_2	
  2882                              <1> sb16_gdmabo_1:
  2883 00015272 E403                <1> 	in	al, 03h ; DMA channel 1 count register
  2884 00015274 88C2                <1> 	mov	dl, al	
  2885 00015276 E403                <1> 	in	al, 03h
  2886 00015278 88C6                <1> 	mov     dh, al
  2887 0001527A 0FB7C2              <1> 	movzx	eax, dx
  2888 0001527D EB30                <1> 	jmp	short sb16_gdmabo_2
  2889                              <1> 
  2890                              <1> get_dma_buffer_offset:
  2891                              <1> 	; 24/06/2017
  2892                              <1> 	; 22/06/2017
  2893                              <1> 	; get current sound (PCM out) data for graphics
  2894                              <1> 	;
  2895                              <1> 	; ebx = Physical address (on page boundary)
  2896                              <1> 	; ecx = Byte count
  2897                              <1> 	; [audio_buff_size]
  2898                              <1> 
  2899 0001527F 8B0D[34940100]      <1> 	mov	ecx, [audio_dmabuff_size]
  2900 00015285 31DB                <1> 	xor	ebx, ebx
  2901                              <1> gdmabo_0:
  2902 00015287 803D[11940100]02    <1> 	cmp	byte [audio_device], 2
  2903 0001528E 72CA                <1> 	jb	short sb16_get_dma_buff_off
  2904 00015290 742A                <1> 	je	short ac97_get_dma_buff_off
  2905                              <1> 
  2906                              <1> vt8233_get_dma_buff_off:
  2907                              <1> 	; 24/06/2017
  2908                              <1> 	; 22/06/2017
  2909                              <1> 	; get current (PCM OUT DMA buffer) pointer
  2910                              <1> 	; (for VT 8233, VT 8237R)
  2911                              <1> 	
  2912                              <1> 	;mov	ecx, [audio_dmabuff_size]
  2913                              <1> 	;xor	ebx, ebx
  2914 00015292 D1E9                <1> 	shr	ecx, 1
  2915                              <1> vt8233_gdmabo_0:
  2916 00015294 BA0C000000          <1> 	mov	edx, VIA_REG_OFFSET_CURR_COUNT
  2917 00015299 E8FDF4FFFF          <1> 	call	ctrl_io_r32
  2918 0001529E 89C2                <1> 	mov	edx, eax ; remain count (bits 23-0),
  2919                              <1> 			 ; SGD index (bits 31-24) 
  2920 000152A0 81E200000001        <1> 	and	edx, 1000000h ; SGD index (0 = 1st half)
  2921 000152A6 7402                <1> 	jz	short vt8233_gdmabo_1
  2922                              <1> 	; the second half of DMA buffer
  2923 000152A8 89CB                <1> 	mov	ebx, ecx 
  2924                              <1> vt8233_gdmabo_1:	
  2925 000152AA 25FFFFFF00          <1> 	and	eax, 0FFFFFFh ; bits 23-0
  2926                              <1> sb16_gdmabo_2:
  2927                              <1> ac97_gdmabo_2:
  2928 000152AF 29C1                <1> 	sub	ecx, eax
  2929 000152B1 7602                <1> 	jna	short vt8233_gdmabo_2
  2930 000152B3 01CB                <1> 	add	ebx, ecx ; dma buffer offset
  2931                              <1> vt8233_gdmabo_2:
  2932 000152B5 891D[64030300]      <1> 	mov	[u.r0], ebx
  2933 000152BB C3                  <1> 	retn
  2934                              <1> 
  2935                              <1> ac97_get_dma_buff_off:
  2936                              <1> 	; 24/06/2017
  2937                              <1> 	; 22/06/2017
  2938                              <1> 	; get current (PCM OUT DMA buffer) pointer
  2939                              <1> 	; (for AC'97, ICH)
  2940                              <1> 	; ebx = Physical address (on page boundary)
  2941                              <1> 	; ecx = Byte count
  2942                              <1> 	; [audio_buff_size]
  2943                              <1> 	
  2944                              <1> 	;mov	ecx, [audio_dmabuff_size]
  2945                              <1> 	;xor	ebx, ebx
  2946 000152BC D1E9                <1> 	shr	ecx, 1
  2947                              <1> ac97_gdmabo_0:
  2948 000152BE 66BA1400            <1> 	mov	dx, PO_CIV_REG ; Position In Current Buff Reg
  2949 000152C2 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2950 000152C9 EC                  <1> 	in	al, dx ; current index value
  2951 000152CA A801                <1> 	test	al, 1
  2952 000152CC 7402                <1> 	jz	short ac97_gdmabo_1
  2953 000152CE 89CB                <1> 	mov	ebx, ecx
  2954                              <1> ac97_gdmabo_1:
  2955 000152D0 31C0                <1> 	xor	eax, eax
  2956 000152D2 66BA1800            <1> 	mov	dx, PO_PICB_REG ; Position In Current Buff Reg
  2957 000152D6 660315[4A940100]    <1> 	add	dx, [NABMBAR]
  2958 000152DD 66ED                <1> 	in	ax, dx ; remain dwords
  2959 000152DF EBCE                <1> 	jmp	short ac97_gdmabo_2
  3425                                  
  3426 000152E1 90<rept>                align 4
  3427                                  
  3428                                  %include 'vgadata.s' ; 04/07/2016
     1                              <1> ; ****************************************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.3 - vgadata.s  (palette and font data)
     3                              <1> ; -----------------------------------------------------------------------------
     4                              <1> ; Last Update: 01/01/2021
     5                              <1> ; -----------------------------------------------------------------------------
     6                              <1> ; Beginning: 16/01/2016
     7                              <1> ; -----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.15 (trdos386.s)
     9                              <1> ; -----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Plex86/Bochs VGABios' source code, vgabios-0.7a (2011)
    14                              <1> ; by the LGPL VGABios Developers Team (2001-2008), 'vgatables.h'
    15                              <1> ;
    16                              <1> ; Oracle VirtualBox 5.0.24 VGABios Source Code 
    17                              <1> ; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
    18                              <1> ;
    19                              <1> ; Palette and font data in assembly language format:
    20                              <1> ; 'VBoxVgaBiosAlternative.asm'
    21                              <1> 
    22                              <1> ; ****************************************************************************************************
    23                              <1> 
    24                              <1> ; 25/11/2020 (TRDOS 386 v2.0.3)
    25                              <1> ; ('vgatables.h' - 30/12/2019 - vruppert)
    26                              <1>  
    27                              <1> ; 04/07/2016
    28                              <1> ; COLOR DATA
    29                              <1> 
    30                              <1> palette0: ; (63+1)*3
    31 000152E4 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
    31 000152ED 00000000000000      <1>
    32 000152F4 00000000000000002A- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    32 000152FD 2A2A2A2A2A2A2A      <1>
    33 00015304 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    33 0001530D 2A2A2A2A2A2A2A      <1>
    34 00015314 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    34 0001531D 2A2A2A2A2A2A2A      <1>
    35 00015324 2A2A2A2A2A2A2A2A3F- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    35 0001532D 3F3F3F3F3F3F3F      <1>
    36 00015334 3F3F3F3F3F3F3F3F3F- <1>     db  03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    36 0001533D 3F3F3F3F3F3F3F      <1>
    37 00015344 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
    37 0001534D 00000000000000      <1>
    38 00015354 00000000000000002A- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    38 0001535D 2A2A2A2A2A2A2A      <1>
    39 00015364 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    39 0001536D 2A2A2A2A2A2A2A      <1>
    40 00015374 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    40 0001537D 2A2A2A2A2A2A2A      <1>
    41 00015384 2A2A2A2A2A2A2A2A3F- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    41 0001538D 3F3F3F3F3F3F3F      <1>
    42 00015394 3F3F3F3F3F3F3F3F3F- <1>     db  03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    42 0001539D 3F3F3F3F3F3F3F      <1>
    43                              <1> palette1: ; (63+1)*3	
    44 000153A4 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    44 000153AD 002A2A2A00002A      <1>
    45 000153B4 002A2A15002A2A2A00- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah
    45 000153BD 000000002A002A      <1>
    46 000153C4 00002A2A2A00002A00- <1>     db  000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah, 000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah
    46 000153CD 2A2A15002A2A2A      <1>
    47 000153D4 15151515153F153F15- <1>     db  015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh, 015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh
    47 000153DD 153F3F3F15153F      <1>
    48 000153E4 153F3F3F153F3F3F15- <1>     db  015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    48 000153ED 151515153F153F      <1>
    49 000153F4 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    49 000153FD 3F3F3F153F3F3F      <1>
    50 00015404 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    50 0001540D 002A2A2A00002A      <1>
    51 00015414 002A2A15002A2A2A00- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah
    51 0001541D 000000002A002A      <1>
    52 00015424 00002A2A2A00002A00- <1>     db  000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah, 000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah
    52 0001542D 2A2A15002A2A2A      <1>
    53 00015434 15151515153F153F15- <1>     db  015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh, 015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh
    53 0001543D 153F3F3F15153F      <1>
    54 00015444 153F3F3F153F3F3F15- <1>     db  015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    54 0001544D 151515153F153F      <1>
    55 00015454 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    55 0001545D 3F3F3F153F3F3F      <1>
    56                              <1> palette2: ; (63+1)*3
    57 00015464 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    57 0001546D 002A2A2A00002A      <1>
    58 00015474 002A2A2A002A2A2A00- <1>     db  000h, 02ah, 02ah, 02ah, 000h, 02ah, 02ah, 02ah, 000h, 000h, 015h, 000h, 000h, 03fh, 000h, 02ah
    58 0001547D 001500003F002A      <1>
    59 00015484 15002A3F2A00152A00- <1>     db  015h, 000h, 02ah, 03fh, 02ah, 000h, 015h, 02ah, 000h, 03fh, 02ah, 02ah, 015h, 02ah, 02ah, 03fh
    59 0001548D 3F2A2A152A2A3F      <1>
    60 00015494 00150000152A003F00- <1>     db  000h, 015h, 000h, 000h, 015h, 02ah, 000h, 03fh, 000h, 000h, 03fh, 02ah, 02ah, 015h, 000h, 02ah
    60 0001549D 003F2A2A15002A      <1>
    61 000154A4 152A2A3F002A3F2A00- <1>     db  015h, 02ah, 02ah, 03fh, 000h, 02ah, 03fh, 02ah, 000h, 015h, 015h, 000h, 015h, 03fh, 000h, 03fh
    61 000154AD 151500153F003F      <1>
    62 000154B4 15003F3F2A15152A15- <1>     db  015h, 000h, 03fh, 03fh, 02ah, 015h, 015h, 02ah, 015h, 03fh, 02ah, 03fh, 015h, 02ah, 03fh, 03fh
    62 000154BD 3F2A3F152A3F3F      <1>
    63 000154C4 15000015002A152A00- <1>     db  015h, 000h, 000h, 015h, 000h, 02ah, 015h, 02ah, 000h, 015h, 02ah, 02ah, 03fh, 000h, 000h, 03fh
    63 000154CD 152A2A3F00003F      <1>
    64 000154D4 002A3F2A003F2A2A15- <1>     db  000h, 02ah, 03fh, 02ah, 000h, 03fh, 02ah, 02ah, 015h, 000h, 015h, 015h, 000h, 03fh, 015h, 02ah
    64 000154DD 001515003F152A      <1>
    65 000154E4 15152A3F3F00153F00- <1>     db  015h, 015h, 02ah, 03fh, 03fh, 000h, 015h, 03fh, 000h, 03fh, 03fh, 02ah, 015h, 03fh, 02ah, 03fh
    65 000154ED 3F3F2A153F2A3F      <1>
    66 000154F4 15150015152A153F00- <1>     db  015h, 015h, 000h, 015h, 015h, 02ah, 015h, 03fh, 000h, 015h, 03fh, 02ah, 03fh, 015h, 000h, 03fh
    66 000154FD 153F2A3F15003F      <1>
    67 00015504 152A3F3F003F3F2A15- <1>     db  015h, 02ah, 03fh, 03fh, 000h, 03fh, 03fh, 02ah, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    67 0001550D 151515153F153F      <1>
    68 00015514 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    68 0001551D 3F3F3F153F3F3F      <1>
    69                              <1> palette3: ; 256*3
    70 00015524 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    70 0001552D 002A2A2A00002A      <1>
    71 00015534 002A2A15002A2A2A15- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    71 0001553D 151515153F153F      <1>
    72 00015544 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    72 0001554D 3F3F3F153F3F3F      <1>
    73 00015554 000000050505080808- <1>     db  000h, 000h, 000h, 005h, 005h, 005h, 008h, 008h, 008h, 00bh, 00bh, 00bh, 00eh, 00eh, 00eh, 011h
    73 0001555D 0B0B0B0E0E0E11      <1>
    74 00015564 11111414141818181C- <1>     db  011h, 011h, 014h, 014h, 014h, 018h, 018h, 018h, 01ch, 01ch, 01ch, 020h, 020h, 020h, 024h, 024h
    74 0001556D 1C1C2020202424      <1>
    75 00015574 242828282D2D2D3232- <1>     db  024h, 028h, 028h, 028h, 02dh, 02dh, 02dh, 032h, 032h, 032h, 038h, 038h, 038h, 03fh, 03fh, 03fh
    75 0001557D 323838383F3F3F      <1>
    76 00015584 00003F10003F1F003F- <1>     db  000h, 000h, 03fh, 010h, 000h, 03fh, 01fh, 000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h, 03fh, 03fh
    76 0001558D 2F003F3F003F3F      <1>
    77 00015594 002F3F001F3F00103F- <1>     db  000h, 02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 000h, 000h, 03fh, 010h, 000h, 03fh, 01fh
    77 0001559D 00003F10003F1F      <1>
    78 000155A4 003F2F003F3F002F3F- <1>     db  000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h, 02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 000h
    78 000155AD 001F3F00103F00      <1>
    79 000155B4 003F00003F10003F1F- <1>     db  000h, 03fh, 000h, 000h, 03fh, 010h, 000h, 03fh, 01fh, 000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h
    79 000155BD 003F2F003F3F00      <1>
    80 000155C4 2F3F001F3F00103F1F- <1>     db  02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh, 02fh, 01fh
    80 000155CD 1F3F271F3F2F1F      <1>
    81 000155D4 3F371F3F3F1F3F3F1F- <1>     db  03fh, 037h, 01fh, 03fh, 03fh, 01fh, 03fh, 03fh, 01fh, 037h, 03fh, 01fh, 02fh, 03fh, 01fh, 027h
    81 000155DD 373F1F2F3F1F27      <1>
    82 000155E4 3F1F1F3F271F3F2F1F- <1>     db  03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh, 02fh, 01fh, 03fh, 037h, 01fh, 03fh, 03fh, 01fh, 037h
    82 000155ED 3F371F3F3F1F37      <1>
    83 000155F4 3F1F2F3F1F273F1F1F- <1>     db  03fh, 01fh, 02fh, 03fh, 01fh, 027h, 03fh, 01fh, 01fh, 03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh
    83 000155FD 3F1F1F3F271F3F      <1>
    84 00015604 2F1F3F371F3F3F1F37- <1>     db  02fh, 01fh, 03fh, 037h, 01fh, 03fh, 03fh, 01fh, 037h, 03fh, 01fh, 02fh, 03fh, 01fh, 027h, 03fh
    84 0001560D 3F1F2F3F1F273F      <1>
    85 00015614 2D2D3F312D3F362D3F- <1>     db  02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h, 02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh, 03fh, 03fh
    85 0001561D 3A2D3F3F2D3F3F      <1>
    86 00015624 2D3A3F2D363F2D313F- <1>     db  02dh, 03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h
    86 0001562D 2D2D3F312D3F36      <1>
    87 00015634 2D3F3A2D3F3F2D3A3F- <1>     db  02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh, 03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 02dh
    87 0001563D 2D363F2D313F2D      <1>
    88 00015644 2D3F2D2D3F312D3F36- <1>     db  02dh, 03fh, 02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h, 02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh
    88 0001564D 2D3F3A2D3F3F2D      <1>
    89 00015654 3A3F2D363F2D313F00- <1>     db  03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 000h, 000h, 01ch, 007h, 000h, 01ch, 00eh, 000h
    89 0001565D 001C07001C0E00      <1>
    90 00015664 1C15001C1C001C1C00- <1>     db  01ch, 015h, 000h, 01ch, 01ch, 000h, 01ch, 01ch, 000h, 015h, 01ch, 000h, 00eh, 01ch, 000h, 007h
    90 0001566D 151C000E1C0007      <1>
    91 00015674 1C00001C07001C0E00- <1>     db  01ch, 000h, 000h, 01ch, 007h, 000h, 01ch, 00eh, 000h, 01ch, 015h, 000h, 01ch, 01ch, 000h, 015h
    91 0001567D 1C15001C1C0015      <1>
    92 00015684 1C000E1C00071C0000- <1>     db  01ch, 000h, 00eh, 01ch, 000h, 007h, 01ch, 000h, 000h, 01ch, 000h, 000h, 01ch, 007h, 000h, 01ch
    92 0001568D 1C00001C07001C      <1>
    93 00015694 0E001C15001C1C0015- <1>     db  00eh, 000h, 01ch, 015h, 000h, 01ch, 01ch, 000h, 015h, 01ch, 000h, 00eh, 01ch, 000h, 007h, 01ch
    93 0001569D 1C000E1C00071C      <1>
    94 000156A4 0E0E1C110E1C150E1C- <1>     db  00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h, 00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh, 01ch, 01ch
    94 000156AD 180E1C1C0E1C1C      <1>
    95 000156B4 0E181C0E151C0E111C- <1>     db  00eh, 018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h
    95 000156BD 0E0E1C110E1C15      <1>
    96 000156C4 0E1C180E1C1C0E181C- <1>     db  00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh, 018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 00eh
    96 000156CD 0E151C0E111C0E      <1>
    97 000156D4 0E1C0E0E1C110E1C15- <1>     db  00eh, 01ch, 00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h, 00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh
    97 000156DD 0E1C180E1C1C0E      <1>
    98 000156E4 181C0E151C0E111C14- <1>     db  018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 014h, 014h, 01ch, 016h, 014h, 01ch, 018h, 014h
    98 000156ED 141C16141C1814      <1>
    99 000156F4 1C1A141C1C141C1C14- <1>     db  01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ch, 01ch, 014h, 01ah, 01ch, 014h, 018h, 01ch, 014h, 016h
    99 000156FD 1A1C14181C1416      <1>
   100 00015704 1C14141C16141C1814- <1>     db  01ch, 014h, 014h, 01ch, 016h, 014h, 01ch, 018h, 014h, 01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ah
   100 0001570D 1C1A141C1C141A      <1>
   101 00015714 1C14181C14161C1414- <1>     db  01ch, 014h, 018h, 01ch, 014h, 016h, 01ch, 014h, 014h, 01ch, 014h, 014h, 01ch, 016h, 014h, 01ch
   101 0001571D 1C14141C16141C      <1>
   102 00015724 18141C1A141C1C141A- <1>     db  018h, 014h, 01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ah, 01ch, 014h, 018h, 01ch, 014h, 016h, 01ch
   102 0001572D 1C14181C14161C      <1>
   103 00015734 000010040010080010- <1>     db  000h, 000h, 010h, 004h, 000h, 010h, 008h, 000h, 010h, 00ch, 000h, 010h, 010h, 000h, 010h, 010h
   103 0001573D 0C001010001010      <1>
   104 00015744 000C10000810000410- <1>     db  000h, 00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 000h, 000h, 010h, 004h, 000h, 010h, 008h
   104 0001574D 00001004001008      <1>
   105 00015754 00100C001010000C10- <1>     db  000h, 010h, 00ch, 000h, 010h, 010h, 000h, 00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 000h
   105 0001575D 00081000041000      <1>
   106 00015764 001000001004001008- <1>     db  000h, 010h, 000h, 000h, 010h, 004h, 000h, 010h, 008h, 000h, 010h, 00ch, 000h, 010h, 010h, 000h
   106 0001576D 00100C00101000      <1>
   107 00015774 0C1000081000041008- <1>     db  00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 008h, 008h, 010h, 00ah, 008h, 010h, 00ch, 008h
   107 0001577D 08100A08100C08      <1>
   108 00015784 100E08101008101008- <1>     db  010h, 00eh, 008h, 010h, 010h, 008h, 010h, 010h, 008h, 00eh, 010h, 008h, 00ch, 010h, 008h, 00ah
   108 0001578D 0E10080C10080A      <1>
   109 00015794 100808100A08100C08- <1>     db  010h, 008h, 008h, 010h, 00ah, 008h, 010h, 00ch, 008h, 010h, 00eh, 008h, 010h, 010h, 008h, 00eh
   109 0001579D 100E081010080E      <1>
   110 000157A4 10080C10080A100808- <1>     db  010h, 008h, 00ch, 010h, 008h, 00ah, 010h, 008h, 008h, 010h, 008h, 008h, 010h, 00ah, 008h, 010h
   110 000157AD 100808100A0810      <1>
   111 000157B4 0C08100E081010080E- <1>     db  00ch, 008h, 010h, 00eh, 008h, 010h, 010h, 008h, 00eh, 010h, 008h, 00ch, 010h, 008h, 00ah, 010h
   111 000157BD 10080C10080A10      <1>
   112 000157C4 0B0B100C0B100D0B10- <1>     db  00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh, 00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh, 010h, 010h
   112 000157CD 0F0B10100B1010      <1>
   113 000157D4 0B0F100B0D100B0C10- <1>     db  00bh, 00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh
   113 000157DD 0B0B100C0B100D      <1>
   114 000157E4 0B100F0B10100B0F10- <1>     db  00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh, 00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 00bh
   114 000157ED 0B0D100B0C100B      <1>
   115 000157F4 0B100B0B100C0B100D- <1>     db  00bh, 010h, 00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh, 00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh
   115 000157FD 0B100F0B10100B      <1>
   116 00015804 0F100B0D100B0C1000- <1>     db  00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   116 0001580D 00000000000000      <1>
   117 00015814 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   117 0001581D 00000000000000      <1>
   118                              <1> 
   119                              <1> 
   120                              <1> ; 04/07/2016
   121                              <1> ; FONT DATA
   122                              <1> 
   123                              <1> CRT_CHAR_GEN:
   124                              <1> vgafont8: 
   125 00015824 00000000000000007E- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 07eh, 081h, 0a5h, 081h, 0bdh, 099h, 081h, 07eh
   125 0001582D 81A581BD99817E      <1>
   126 00015834 7EFFDBFFC3E7FF7E6C- <1>     db  07eh, 0ffh, 0dbh, 0ffh, 0c3h, 0e7h, 0ffh, 07eh, 06ch, 0feh, 0feh, 0feh, 07ch, 038h, 010h, 000h
   126 0001583D FEFEFE7C381000      <1>
   127 00015844 10387CFE7C38100038- <1>     db  010h, 038h, 07ch, 0feh, 07ch, 038h, 010h, 000h, 038h, 07ch, 038h, 0feh, 0feh, 07ch, 038h, 07ch
   127 0001584D 7C38FEFE7C387C      <1>
   128 00015854 1010387CFE7C387C00- <1>     db  010h, 010h, 038h, 07ch, 0feh, 07ch, 038h, 07ch, 000h, 000h, 018h, 03ch, 03ch, 018h, 000h, 000h
   128 0001585D 00183C3C180000      <1>
   129 00015864 FFFFE7C3C3E7FFFF00- <1>     db  0ffh, 0ffh, 0e7h, 0c3h, 0c3h, 0e7h, 0ffh, 0ffh, 000h, 03ch, 066h, 042h, 042h, 066h, 03ch, 000h
   129 0001586D 3C664242663C00      <1>
   130 00015874 FFC399BDBD99C3FF0F- <1>     db  0ffh, 0c3h, 099h, 0bdh, 0bdh, 099h, 0c3h, 0ffh, 00fh, 007h, 00fh, 07dh, 0cch, 0cch, 0cch, 078h
   130 0001587D 070F7DCCCCCC78      <1>
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   147 0001598D 0000FC00000000      <1>
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   151 000159CD C0F80C0CCC7800      <1>
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   156 00015A1D CC0C1830003000      <1>
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   159 00015A4D 6268786862FE00      <1>
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   160 00015A5D 66C0C0CE663E00      <1>
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   162 00015A7D 666C786C66E600      <1>
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   163 00015A8D EEFEFED6C6C600      <1>
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   165 00015AAD CCCCCCDC781C00      <1>
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   166 00015ABD CCE0701CCC7800      <1>
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   167 00015ACD CCCCCCCCCCFC00      <1>
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   168 00015ADD C6C6D6FEEEC600      <1>
   169 00015AE4 C6C66C38386CC600CC- <1>     db  0c6h, 0c6h, 06ch, 038h, 038h, 06ch, 0c6h, 000h, 0cch, 0cch, 0cch, 078h, 030h, 030h, 078h, 000h
   169 00015AED CCCC7830307800      <1>
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   170 00015AFD 60606060607800      <1>
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   171 00015B0D 18181818187800      <1>
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   172 00015B1D 000000000000FF      <1>
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   173 00015B2D 00780C7CCC7600      <1>
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   174 00015B3D 0078CCC0CC7800      <1>
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   175 00015B4D 0078CCFCC07800      <1>
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   176 00015B5D 0076CCCC7C0CF8      <1>
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   177 00015B6D 00703030307800      <1>
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   178 00015B7D 60666C786CE600      <1>
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   179 00015B8D 00CCFEFED6C600      <1>
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   180 00015B9D 0078CCCCCC7800      <1>
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   181 00015BAD 0076CCCC7C0C1E      <1>
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   182 00015BBD 007CC0780CF800      <1>
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   184 00015BDD 00C6D6FEFE6C00      <1>
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   185 00015BED 00CCCCCC7C0CF8      <1>
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   187 00015C0D 30301C3030E000      <1>
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   188 00015C1D 10386CC6C6FE00      <1>
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   189 00015C2D CC00CCCCCC7E00      <1>
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   190 00015C3D C33C063E663F00      <1>
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   191 00015C4D 00780C7CCC7E00      <1>
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   192 00015C5D 0078C0C0780C38      <1>
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   193 00015C6D 0078CCFCC07800      <1>
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   194 00015C7D 00703030307800      <1>
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   195 00015C8D 00703030307800      <1>
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   196 00015C9D 300078CCFCCC00      <1>
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   197 00015CAD 007F0C7FCC7F00      <1>
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   198 00015CBD CC0078CCCC7800      <1>
   199 00015CC4 00CC0078CCCC780000- <1>     db  000h, 0cch, 000h, 078h, 0cch, 0cch, 078h, 000h, 000h, 0e0h, 000h, 078h, 0cch, 0cch, 078h, 000h
   199 00015CCD E00078CCCC7800      <1>
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   200 00015CDD E000CCCCCC7E00      <1>
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   201 00015CED 183C66663C1800      <1>
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   202 00015CFD 187EC0C07E1818      <1>
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   203 00015D0D CC78FC30FC3030      <1>
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   204 00015D1D 1B183C1818D870      <1>
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   205 00015D2D 00703030307800      <1>
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   206 00015D3D 1C00CCCCCC7E00      <1>
   207 00015D44 00F800F8CCCCCC00FC- <1>     db  000h, 0f8h, 000h, 0f8h, 0cch, 0cch, 0cch, 000h, 0fch, 000h, 0cch, 0ech, 0fch, 0dch, 0cch, 000h
   207 00015D4D 00CCECFCDCCC00      <1>
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   208 00015D5D 6C6C38007C0000      <1>
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   238 00015F3D FE6C6C6C6C6C00      <1>
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   241 00015F6D 6CC6FEC66C3800      <1>
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   242 00015F7D 30187CCCCC7800      <1>
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   244 00015F9D CCCCCCCCCCCC00      <1>
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   246 00015FBD 3060301800FC00      <1>
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   247 00015FCD 18181818D8D870      <1>
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   252 0001601D 00000000000000      <1>
   253                              <1> vgafont14:
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   254 0001602D 00000000000000      <1>
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   255 0001603D 00000000007EFF      <1>
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   256 0001604D 000000006CFEFE      <1>
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   262 000160AD 000000FFFFFFFF      <1>
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   265 000160DD 333F30303070F0      <1>
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   266 000160ED 63636367E7E6C0      <1>
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   269 0001611D 0000000000183C      <1>
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   270 0001612D 00000066666666      <1>
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   271 0001613D 007FDBDBDB7B1B      <1>
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   272 0001614D 60386CC6C66C38      <1>
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   273 0001615D 000000FEFEFE00      <1>
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   274 0001616D 187E3C187E0000      <1>
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   275 0001617D 18180000000000      <1>
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   276 0001618D 00000000000000      <1>
   277 00016194 180CFE0C1800000000- <1>     db  018h, 00ch, 0feh, 00ch, 018h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 030h, 060h
   277 0001619D 00000000003060      <1>
   278 000161A4 FE6030000000000000- <1>     db  0feh, 060h, 030h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 0c0h, 0c0h, 0c0h
   278 000161AD 00000000C0C0C0      <1>
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   279 000161BD 00286CFE6C2800      <1>
   280 000161C4 000000000000001038- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 010h, 038h, 038h, 07ch, 07ch, 0feh, 0feh, 000h, 000h
   280 000161CD 387C7CFEFE0000      <1>
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   281 000161DD 38381000000000      <1>
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   282 000161ED 00000000000000      <1>
   283 000161F4 183C3C3C1818001818- <1>     db  018h, 03ch, 03ch, 03ch, 018h, 018h, 000h, 018h, 018h, 000h, 000h, 000h, 000h, 066h, 066h, 066h
   283 000161FD 00000000666666      <1>
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   284 0001620D 0000006C6CFE6C      <1>
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   285 0001621D 187CC6C2C07C06      <1>
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   286 0001622D 00C2C60C183066      <1>
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   287 0001623D 3876DCCCCC7600      <1>
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   288 0001624D 00000000000000      <1>
   289 00016254 00000C183030303030- <1>     db  000h, 000h, 00ch, 018h, 030h, 030h, 030h, 030h, 030h, 018h, 00ch, 000h, 000h, 000h, 000h, 000h
   289 0001625D 180C0000000000      <1>
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   290 0001626D 00000000000000      <1>
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   452 00016C8D 0000000000FE6C      <1>
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   700 00017BFD F0F0F0F0F0F0F0      <1>
   701 00017C04 0F0F0F0F0F0F0F0F0F- <1>     db  00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh, 00fh
   701 00017C0D 0F0F0F0F0F0F0F      <1>
   702 00017C14 FFFFFFFFFFFFFF0000- <1>     db  0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 0ffh, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   702 00017C1D 00000000000000      <1>
   703 00017C24 000000000076DCD8D8- <1>     db  000h, 000h, 000h, 000h, 000h, 076h, 0dch, 0d8h, 0d8h, 0d8h, 0dch, 076h, 000h, 000h, 000h, 000h
   703 00017C2D D8DC7600000000      <1>
   704 00017C34 000078CCCCCCD8CCC6- <1>     db  000h, 000h, 078h, 0cch, 0cch, 0cch, 0d8h, 0cch, 0c6h, 0c6h, 0c6h, 0cch, 000h, 000h, 000h, 000h
   704 00017C3D C6C6CC00000000      <1>
   705 00017C44 0000FEC6C6C0C0C0C0- <1>     db  000h, 000h, 0feh, 0c6h, 0c6h, 0c0h, 0c0h, 0c0h, 0c0h, 0c0h, 0c0h, 0c0h, 000h, 000h, 000h, 000h
   705 00017C4D C0C0C000000000      <1>
   706 00017C54 00000000FE6C6C6C6C- <1>     db  000h, 000h, 000h, 000h, 0feh, 06ch, 06ch, 06ch, 06ch, 06ch, 06ch, 06ch, 000h, 000h, 000h, 000h
   706 00017C5D 6C6C6C00000000      <1>
   707 00017C64 000000FEC660301830- <1>     db  000h, 000h, 000h, 0feh, 0c6h, 060h, 030h, 018h, 030h, 060h, 0c6h, 0feh, 000h, 000h, 000h, 000h
   707 00017C6D 60C6FE00000000      <1>
   708 00017C74 00000000007ED8D8D8- <1>     db  000h, 000h, 000h, 000h, 000h, 07eh, 0d8h, 0d8h, 0d8h, 0d8h, 0d8h, 070h, 000h, 000h, 000h, 000h
   708 00017C7D D8D87000000000      <1>
   709 00017C84 000000006666666666- <1>     db  000h, 000h, 000h, 000h, 066h, 066h, 066h, 066h, 066h, 07ch, 060h, 060h, 0c0h, 000h, 000h, 000h
   709 00017C8D 7C6060C0000000      <1>
   710 00017C94 0000000076DC181818- <1>     db  000h, 000h, 000h, 000h, 076h, 0dch, 018h, 018h, 018h, 018h, 018h, 018h, 000h, 000h, 000h, 000h
   710 00017C9D 18181800000000      <1>
   711 00017CA4 0000007E183C666666- <1>     db  000h, 000h, 000h, 07eh, 018h, 03ch, 066h, 066h, 066h, 03ch, 018h, 07eh, 000h, 000h, 000h, 000h
   711 00017CAD 3C187E00000000      <1>
   712 00017CB4 000000386CC6C6FEC6- <1>     db  000h, 000h, 000h, 038h, 06ch, 0c6h, 0c6h, 0feh, 0c6h, 0c6h, 06ch, 038h, 000h, 000h, 000h, 000h
   712 00017CBD C66C3800000000      <1>
   713 00017CC4 0000386CC6C6C66C6C- <1>     db  000h, 000h, 038h, 06ch, 0c6h, 0c6h, 0c6h, 06ch, 06ch, 06ch, 06ch, 0eeh, 000h, 000h, 000h, 000h
   713 00017CCD 6C6CEE00000000      <1>
   714 00017CD4 00001E30180C3E6666- <1>     db  000h, 000h, 01eh, 030h, 018h, 00ch, 03eh, 066h, 066h, 066h, 066h, 03ch, 000h, 000h, 000h, 000h
   714 00017CDD 66663C00000000      <1>
   715 00017CE4 00000000007EDBDBDB- <1>     db  000h, 000h, 000h, 000h, 000h, 07eh, 0dbh, 0dbh, 0dbh, 07eh, 000h, 000h, 000h, 000h, 000h, 000h
   715 00017CED 7E000000000000      <1>
   716 00017CF4 00000003067EDBDBF3- <1>     db  000h, 000h, 000h, 003h, 006h, 07eh, 0dbh, 0dbh, 0f3h, 07eh, 060h, 0c0h, 000h, 000h, 000h, 000h
   716 00017CFD 7E60C000000000      <1>
   717 00017D04 00001C3060607C6060- <1>     db  000h, 000h, 01ch, 030h, 060h, 060h, 07ch, 060h, 060h, 060h, 030h, 01ch, 000h, 000h, 000h, 000h
   717 00017D0D 60301C00000000      <1>
   718 00017D14 0000007CC6C6C6C6C6- <1>     db  000h, 000h, 000h, 07ch, 0c6h, 0c6h, 0c6h, 0c6h, 0c6h, 0c6h, 0c6h, 0c6h, 000h, 000h, 000h, 000h
   718 00017D1D C6C6C600000000      <1>
   719 00017D24 00000000FE0000FE00- <1>     db  000h, 000h, 000h, 000h, 0feh, 000h, 000h, 0feh, 000h, 000h, 0feh, 000h, 000h, 000h, 000h, 000h
   719 00017D2D 00FE0000000000      <1>
   720 00017D34 0000000018187E1818- <1>     db  000h, 000h, 000h, 000h, 018h, 018h, 07eh, 018h, 018h, 000h, 000h, 0ffh, 000h, 000h, 000h, 000h
   720 00017D3D 0000FF00000000      <1>
   721 00017D44 00000030180C060C18- <1>     db  000h, 000h, 000h, 030h, 018h, 00ch, 006h, 00ch, 018h, 030h, 000h, 07eh, 000h, 000h, 000h, 000h
   721 00017D4D 30007E00000000      <1>
   722 00017D54 0000000C1830603018- <1>     db  000h, 000h, 000h, 00ch, 018h, 030h, 060h, 030h, 018h, 00ch, 000h, 07eh, 000h, 000h, 000h, 000h
   722 00017D5D 0C007E00000000      <1>
   723 00017D64 00000E1B1B18181818- <1>     db  000h, 000h, 00eh, 01bh, 01bh, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h
   723 00017D6D 18181818181818      <1>
   724 00017D74 1818181818181818D8- <1>     db  018h, 018h, 018h, 018h, 018h, 018h, 018h, 018h, 0d8h, 0d8h, 0d8h, 070h, 000h, 000h, 000h, 000h
   724 00017D7D D8D87000000000      <1>
   725 00017D84 000000001818007E00- <1>     db  000h, 000h, 000h, 000h, 018h, 018h, 000h, 07eh, 000h, 018h, 018h, 000h, 000h, 000h, 000h, 000h
   725 00017D8D 18180000000000      <1>
   726 00017D94 000000000076DC0076- <1>     db  000h, 000h, 000h, 000h, 000h, 076h, 0dch, 000h, 076h, 0dch, 000h, 000h, 000h, 000h, 000h, 000h
   726 00017D9D DC000000000000      <1>
   727 00017DA4 00386C6C3800000000- <1>     db  000h, 038h, 06ch, 06ch, 038h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   727 00017DAD 00000000000000      <1>
   728 00017DB4 000000000000001818- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 018h, 018h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   728 00017DBD 00000000000000      <1>
   729 00017DC4 000000000000000018- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 018h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   729 00017DCD 00000000000000      <1>
   730 00017DD4 000F0C0C0C0C0CEC6C- <1>     db  000h, 00fh, 00ch, 00ch, 00ch, 00ch, 00ch, 0ech, 06ch, 06ch, 03ch, 01ch, 000h, 000h, 000h, 000h
   730 00017DDD 6C3C1C00000000      <1>
   731 00017DE4 00D86C6C6C6C6C0000- <1>     db  000h, 0d8h, 06ch, 06ch, 06ch, 06ch, 06ch, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   731 00017DED 00000000000000      <1>
   732 00017DF4 0070D83060C8F80000- <1>     db  000h, 070h, 0d8h, 030h, 060h, 0c8h, 0f8h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   732 00017DFD 00000000000000      <1>
   733 00017E04 000000007C7C7C7C7C- <1>     db  000h, 000h, 000h, 000h, 07ch, 07ch, 07ch, 07ch, 07ch, 07ch, 07ch, 000h, 000h, 000h, 000h, 000h
   733 00017E0D 7C7C0000000000      <1>
   734 00017E14 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   734 00017E1D 00000000000000      <1>
   735                              <1> 
   736                              <1> ; 01/01/2021 (TRDOS 386 v2.0.3)
   737                              <1> 
   738                              <1> %if 0
   739                              <1> 
   740                              <1> vgafont14alt:
   741                              <1>     db  01dh, 000h, 000h, 000h, 000h, 024h, 066h, 0ffh, 066h, 024h, 000h, 000h, 000h, 000h, 000h, 022h
   742                              <1>     db  000h, 063h, 063h, 063h, 022h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 02bh, 000h
   743                              <1>     db  000h, 000h, 018h, 018h, 018h, 0ffh, 018h, 018h, 018h, 000h, 000h, 000h, 000h, 02dh, 000h, 000h
   744                              <1>     db  000h, 000h, 000h, 000h, 0ffh, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 04dh, 000h, 000h, 0c3h
   745                              <1>     db  0e7h, 0ffh, 0dbh, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 000h, 000h, 000h, 054h, 000h, 000h, 0ffh, 0dbh
   746                              <1>     db  099h, 018h, 018h, 018h, 018h, 018h, 03ch, 000h, 000h, 000h, 056h, 000h, 000h, 0c3h, 0c3h, 0c3h
   747                              <1>     db  0c3h, 0c3h, 0c3h, 066h, 03ch, 018h, 000h, 000h, 000h, 057h, 000h, 000h, 0c3h, 0c3h, 0c3h, 0c3h
   748                              <1>     db  0dbh, 0dbh, 0ffh, 066h, 066h, 000h, 000h, 000h, 058h, 000h, 000h, 0c3h, 0c3h, 066h, 03ch, 018h
   749                              <1>     db  03ch, 066h, 0c3h, 0c3h, 000h, 000h, 000h, 059h, 000h, 000h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h
   750                              <1>     db  018h, 018h, 03ch, 000h, 000h, 000h, 05ah, 000h, 000h, 0ffh, 0c3h, 086h, 00ch, 018h, 030h, 061h
   751                              <1>     db  0c3h, 0ffh, 000h, 000h, 000h, 06dh, 000h, 000h, 000h, 000h, 000h, 0e6h, 0ffh, 0dbh, 0dbh, 0dbh
   752                              <1>     db  0dbh, 000h, 000h, 000h, 076h, 000h, 000h, 000h, 000h, 000h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h
   753                              <1>     db  000h, 000h, 000h, 077h, 000h, 000h, 000h, 000h, 000h, 0c3h, 0c3h, 0dbh, 0dbh, 0ffh, 066h, 000h
   754                              <1>     db  000h, 000h, 091h, 000h, 000h, 000h, 000h, 06eh, 03bh, 01bh, 07eh, 0d8h, 0dch, 077h, 000h, 000h
   755                              <1>     db  000h, 09bh, 000h, 018h, 018h, 07eh, 0c3h, 0c0h, 0c0h, 0c3h, 07eh, 018h, 018h, 000h, 000h, 000h
   756                              <1>     db  09dh, 000h, 000h, 0c3h, 066h, 03ch, 018h, 0ffh, 018h, 0ffh, 018h, 018h, 000h, 000h, 000h, 09eh
   757                              <1>     db  000h, 0fch, 066h, 066h, 07ch, 062h, 066h, 06fh, 066h, 066h, 0f3h, 000h, 000h, 000h, 0f1h, 000h
   758                              <1>     db  000h, 018h, 018h, 018h, 0ffh, 018h, 018h, 018h, 000h, 0ffh, 000h, 000h, 000h, 0f6h, 000h, 000h
   759                              <1>     db  018h, 018h, 000h, 000h, 0ffh, 000h, 000h, 018h, 018h, 000h, 000h, 000h, 000h
   760                              <1> vgafont16alt:
   761                              <1>     db  01dh, 000h, 000h, 000h, 000h, 000h, 024h, 066h, 0ffh, 066h, 024h, 000h, 000h, 000h, 000h, 000h
   762                              <1>     db  000h, 030h, 000h, 000h, 03ch, 066h, 0c3h, 0c3h, 0dbh, 0dbh, 0c3h, 0c3h, 066h, 03ch, 000h, 000h
   763                              <1>     db  000h, 000h, 04dh, 000h, 000h, 0c3h, 0e7h, 0ffh, 0ffh, 0dbh, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 000h
   764                              <1>     db  000h, 000h, 000h, 054h, 000h, 000h, 0ffh, 0dbh, 099h, 018h, 018h, 018h, 018h, 018h, 018h, 03ch
   765                              <1>     db  000h, 000h, 000h, 000h, 056h, 000h, 000h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 066h, 03ch
   766                              <1>     db  018h, 000h, 000h, 000h, 000h, 057h, 000h, 000h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0dbh, 0dbh, 0ffh
   767                              <1>     db  066h, 066h, 000h, 000h, 000h, 000h, 058h, 000h, 000h, 0c3h, 0c3h, 066h, 03ch, 018h, 018h, 03ch
   768                              <1>     db  066h, 0c3h, 0c3h, 000h, 000h, 000h, 000h, 059h, 000h, 000h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h
   769                              <1>     db  018h, 018h, 018h, 03ch, 000h, 000h, 000h, 000h, 05ah, 000h, 000h, 0ffh, 0c3h, 086h, 00ch, 018h
   770                              <1>     db  030h, 060h, 0c1h, 0c3h, 0ffh, 000h, 000h, 000h, 000h, 06dh, 000h, 000h, 000h, 000h, 000h, 0e6h
   771                              <1>     db  0ffh, 0dbh, 0dbh, 0dbh, 0dbh, 0dbh, 000h, 000h, 000h, 000h, 076h, 000h, 000h, 000h, 000h, 000h
   772                              <1>     db  0c3h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h, 000h, 000h, 000h, 000h, 077h, 000h, 000h, 000h, 000h
   773                              <1>     db  000h, 0c3h, 0c3h, 0c3h, 0dbh, 0dbh, 0ffh, 066h, 000h, 000h, 000h, 000h, 078h, 000h, 000h, 000h
   774                              <1>     db  000h, 000h, 0c3h, 066h, 03ch, 018h, 03ch, 066h, 0c3h, 000h, 000h, 000h, 000h, 091h, 000h, 000h
   775                              <1>     db  000h, 000h, 000h, 06eh, 03bh, 01bh, 07eh, 0d8h, 0dch, 077h, 000h, 000h, 000h, 000h, 09bh, 000h
   776                              <1>     db  018h, 018h, 07eh, 0c3h, 0c0h, 0c0h, 0c0h, 0c3h, 07eh, 018h, 018h, 000h, 000h, 000h, 000h, 09dh
   777                              <1>     db  000h, 000h, 0c3h, 066h, 03ch, 018h, 0ffh, 018h, 0ffh, 018h, 018h, 018h, 000h, 000h, 000h, 000h
   778                              <1>     db  09eh, 000h, 0fch, 066h, 066h, 07ch, 062h, 066h, 06fh, 066h, 066h, 066h, 0f3h, 000h, 000h, 000h
   779                              <1>     db  000h, 0abh, 000h, 0c0h, 0c0h, 0c2h, 0c6h, 0cch, 018h, 030h, 060h, 0ceh, 09bh, 006h, 00ch, 01fh
   780                              <1>     db  000h, 000h, 0ach, 000h, 0c0h, 0c0h, 0c2h, 0c6h, 0cch, 018h, 030h, 066h, 0ceh, 096h, 03eh, 006h
   781                              <1>     db  006h, 000h, 000h, 000h
   782                              <1> 
   783                              <1> %endif
  3429                                  
  3430                                  ; 20/11/2020
  3431                                  vbe2_bochs_vbios:
  3432                                  ;	db "BOCHS/QEMU"
  3433 00017E24 424F4348532F51454D-     	db "BOCHS/QEMU/VIRTUALBOX"  ; 26/11/2020
  3433 00017E2D 552F5649525455414C-
  3433 00017E36 424F58             
  3434                                  ;vbe_vnumber equ vbe2_bochs_vbios + 28 ; "3" or "2"
  3435                                  ; 26/11/2020
  3436                                  vbe_vnumber equ vbe2_bochs_vbios + 30 ; "3" or "2"
  3437                                  ; 15/11/2020
  3438                                  vesa_vbe3_bios_msg:
  3439                                  	;db " VESA VBE version 3 Video BIOS ..."
  3440 00017E39 205645534120564245-     	db " VESA VBE3 Video BIOS ..." ; 26/11/2020
  3440 00017E42 3320566964656F2042-
  3440 00017E4B 494F53202E2E2E     
  3441 00017E52 0D0A0D0A00              	db 0Dh, 0Ah, 0Dh, 0Ah, 0
  3442                                  
  3443 00017E57 90                      align 2
  3444                                  
  3445                                  ; EPOCH Variables
  3446                                  ; 13/04/2015 - Retro UNIX 386 v1 Beginning
  3447                                  ; 09/04/2013 epoch variables
  3448                                  ; Retro UNIX 8086 v1 Prototype: UNIXCOPY.ASM, 10/03/2013
  3449                                  ;
  3450 00017E58 B207                    year: 	dw 1970
  3451 00017E5A 0100                    month: 	dw 1
  3452 00017E5C 0100                    day: 	dw 1
  3453 00017E5E 0000                    hour: 	dw 0
  3454 00017E60 0000                    minute: dw 0
  3455 00017E62 0000                    second: dw 0
  3456                                  
  3457                                  DMonth:
  3458 00017E64 0000                    	dw 0
  3459 00017E66 1F00                    	dw 31
  3460 00017E68 3B00                    	dw 59
  3461 00017E6A 5A00                    	dw 90
  3462 00017E6C 7800                    	dw 120
  3463 00017E6E 9700                    	dw 151
  3464 00017E70 B500                    	dw 181
  3465 00017E72 D400                    	dw 212
  3466 00017E74 F300                    	dw 243
  3467 00017E76 1101                    	dw 273
  3468 00017E78 3001                    	dw 304
  3469 00017E7A 4E01                    	dw 334
  3470                                  
  3471                                  ; 15/11/2020
  3472 00017E7C 00                      db	0
  3473                                  kernel_version_msg: ; 20/11/2020
  3474 00017E7D 5452444F5320283338-     db	"TRDOS (386) Kernel v2.0.3 by Erdogan Tan"
  3474 00017E86 3629204B65726E656C-
  3474 00017E8F 2076322E302E332062-
  3474 00017E98 79204572646F67616E-
  3474 00017EA1 2054616E           
  3475 00017EA5 00                      db	0
  3476                                  
  3477                                  ; 20/02/2017
  3478                                  KERNELFSIZE  equ $  ; 04/07/2016
  3479                                  
  3480                                  bss_start:
  3481                                  
  3482                                  ABSOLUTE bss_start
  3483                                  
  3484 00017EA6 <res 00000002>          alignb 8 ; 25/12/2016
  3485                                  
  3486                                  	; 15/04/2016
  3487                                  	; TRDOS 386 (TRDOS v2.0)
  3488                                  	; 	80 interrupts 	
  3489                                  	; 11/03/2015
  3490                                  	; Interrupt Descriptor Table (20/08/2014)
  3491                                  idt:
  3492                                  	;resb	64*8 ; INT 0 to INT 3Fh
  3493                                  	; 15/04/2016
  3494 00017EA8 <res 00000280>          	resb	80*8 ; INT 0 to INT 4Fh
  3495                                  
  3496                                  idt_end:
  3497                                  
  3498                                  ;alignb 4
  3499                                  
  3500                                  task_state_segment:
  3501                                  	; 24/03/2015
  3502 00018128 <res 00000002>          tss.link:   resw 1
  3503 0001812A <res 00000002>          	    resw 1
  3504                                  ; tss offset 4	
  3505 0001812C <res 00000004>          tss.esp0:   resd 1
  3506 00018130 <res 00000002>          tss.ss0:    resw 1
  3507 00018132 <res 00000002>          	    resw 1	
  3508 00018134 <res 00000004>          tss.esp1:   resd 1
  3509 00018138 <res 00000002>          tss.ss1:    resw 1
  3510 0001813A <res 00000002>          	    resw 1 	
  3511 0001813C <res 00000004>          tss.esp2:   resd 1
  3512 00018140 <res 00000002>          tss.ss2:    resw 1
  3513 00018142 <res 00000002>          	    resw 1
  3514                                  ; tss offset 28
  3515 00018144 <res 00000004>          tss.CR3:    resd 1
  3516 00018148 <res 00000004>          tss.eip:    resd 1
  3517 0001814C <res 00000004>          tss.eflags: resd 1
  3518                                  ; tss offset 40
  3519 00018150 <res 00000004>          tss.eax:    resd 1		 		
  3520 00018154 <res 00000004>          tss.ecx:    resd 1
  3521 00018158 <res 00000004>          tss.edx:    resd 1
  3522 0001815C <res 00000004>          tss.ebx:    resd 1
  3523 00018160 <res 00000004>          tss.esp:    resd 1
  3524 00018164 <res 00000004>          tss.ebp:    resd 1
  3525 00018168 <res 00000004>          tss.esi:    resd 1
  3526 0001816C <res 00000004>          tss.edi:    resd 1
  3527                                  ; tss offset 72
  3528 00018170 <res 00000002>          tss.ES:     resw 1
  3529 00018172 <res 00000002>          	    resw 1	
  3530 00018174 <res 00000002>          tss.CS:	    resw 1
  3531 00018176 <res 00000002>          	    resw 1
  3532 00018178 <res 00000002>          tss.SS:	    resw 1
  3533 0001817A <res 00000002>          	    resw 1
  3534 0001817C <res 00000002>          tss.DS:	    resw 1
  3535 0001817E <res 00000002>          	    resw 1
  3536 00018180 <res 00000002>          tss.FS:	    resw 1
  3537 00018182 <res 00000002>          	    resw 1
  3538 00018184 <res 00000002>          tss.GS:	    resw 1
  3539 00018186 <res 00000002>          	    resw 1		
  3540 00018188 <res 00000002>          tss.LDTR:   resw 1
  3541 0001818A <res 00000002>          	    resw 1
  3542                                  ; tss offset 100		
  3543 0001818C <res 00000002>          	    resw 1		
  3544 0001818E <res 00000002>          tss.IOPB:   resw 1
  3545                                  ; tss offset 104 
  3546                                  tss_end:
  3547                                  
  3548 00018190 <res 00000004>          k_page_dir:  resd 1 ; Kernel's (System) Page Directory address
  3549                                  		    ; (Physical address = Virtual address)	 	
  3550 00018194 <res 00000004>          memory_size: resd 1 ; memory size in pages
  3551 00018198 <res 00000004>          free_pages:  resd 1 ; number of free pages		
  3552 0001819C <res 00000004>          next_page:   resd 1 ; offset value in M.A.T. for
  3553                                  		    ; first free page search
  3554 000181A0 <res 00000004>          last_page:   resd 1 ; offset value in M.A.T. which
  3555                                  		    ; next free page search will be
  3556                                  		    ; stopped after it. (end of M.A.T.)
  3557 000181A4 <res 00000004>          first_page:  resd 1 ; offset value in M.A.T. which
  3558                                  		    ; first free page search
  3559                                  		    ; will be started on it. (for user)
  3560 000181A8 <res 00000004>          mat_size:    resd 1 ; Memory Allocation Table size in pages
  3561                                  
  3562                                  ; 20/11/2020
  3563                                  ;vbe2bios:    resw 1 ; VBE2 video bios ID (bochs/qemu)
  3564                                  ;		    ; (0B0C4h or 0B0C5h for bochs/plex86 vgabios)				
  3565                                  
  3566                                  ; 02/09/2014 (Retro UNIX 386 v1)
  3567                                  ; 04/12/2013 (Retro UNIX 8086 v1)
  3568 000181AC <res 00000002>          CRT_START:   resw 1 	  ; starting address in regen buffer
  3569                                  			  ; NOTE: active page only	
  3570 000181AE <res 00000010>          CURSOR_POSN: resw 8 ; cursor positions for video pages
  3571                                  ACTIVE_PAGE: 
  3572 000181BE <res 00000001>          ptty: 	     resb 1 ; current tty
  3573                                  ; 01/07/2015 - 29/01/2016
  3574 000181BF <res 00000001>          ccolor:	     resb 1 ; current color attribute
  3575                                  ; 26/10/2015
  3576                                  ; 07/09/2014
  3577 000181C0 <res 00000014>          ttychr:      resw ntty+2 ; Character buffer (multiscreen)
  3578                                  
  3579                                  ; 18/05/2015 (03/06/2013 - Retro UNIX 8086 v1 feature only!)
  3580 000181D4 <res 00000004>          p_time:      resd 1     ; present time (for systime & sysmdate)
  3581                                  
  3582                                  ; 18/05/2015 (16/08/2013 - Retro UNIX 8086 v1 feature only !)
  3583                                  ; (open mode locks for pseudo TTYs)
  3584                                  ; [ major tty locks (return error in any conflicts) ]
  3585 000181D8 <res 00000014>          ttyl:        resw ntty+2 ; opening locks for TTYs.
  3586                                  
  3587                                  ; 15/04/2015 (Retro UNIX 386 v1)
  3588                                  ; 22/09/2013 (Retro UNIX 8086 v1)
  3589 000181EC <res 0000000A>          wlist:       resb ntty+2 ; wait channel list (0 to 9 for TTYs)
  3590                                  ; 15/04/2015 (Retro UNIX 386 v1)
  3591                                  ;; 12/07/2014 -> sp_init set comm. parameters as 0E3h
  3592                                  ;; 0 means serial port is not available 
  3593                                  ;;comprm: ; 25/06/2014
  3594 000181F6 <res 00000001>          com1p:       resb 1  ;;0E3h
  3595 000181F7 <res 00000001>          com2p:       resb 1  ;;0E3h
  3596                                  
  3597                                  ; 17/11/2015
  3598                                  ; request for response (from the terminal)	
  3599 000181F8 <res 00000002>          req_resp:    resw 1 			
  3600                                  ; 07/11/2015
  3601 000181FA <res 00000001>          ccomport:    resb 1 ; current COM (serial) port
  3602                                  		    ; (0= COM1, 1= COM2)
  3603                                  ; 09/11/2015
  3604 000181FB <res 00000001>          comqr:	     resb 1 ; 'query or response' sign (u9.s, 'sndc')
  3605                                  ; 07/11/2015
  3606 000181FC <res 00000002>          rchar:	     resw 1 ; last received char for COM 1 and COM 2		
  3607 000181FE <res 00000002>          schar:	     resw 1 ; last sent char for COM 1 and COM 2
  3608                                  
  3609                                  ; 22/08/2014 (RTC)
  3610                                  ; (Packed BCD)
  3611 00018200 <res 00000001>          time_seconds: resb 1
  3612 00018201 <res 00000001>          time_minutes: resb 1
  3613 00018202 <res 00000001>          time_hours:   resb 1
  3614 00018203 <res 00000001>          date_wday:    resb 1
  3615 00018204 <res 00000001>          date_day:     resb 1
  3616 00018205 <res 00000001>          date_month:   resb 1			
  3617 00018206 <res 00000001>          date_year:    resb 1
  3618 00018207 <res 00000001>          date_century: resb 1
  3619                                  
  3620                                  ; 24/01/2016
  3621 00018208 <res 00000004>          RTC_LH:	       resd 1
  3622 0001820C <res 00000001>          RTC_WAIT_FLAG: resb 1
  3623 0001820D <res 00000001>          USER_FLAG:     resb 1
  3624                                  ; 19/05/2016
  3625                                  ;RTC_second:
  3626 0001820E <res 00000001>          RTC_2Hz:       resb 1 ;  from 2Hz interrupt to 1Hz timer event function	
  3627                                  
  3628                                  %include 'diskbss.s'	; UNINITIALIZED DISK (BIOS) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - diskbss.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 24/01/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; diskbss.inc (10/07/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - DISKBSS.INC
    20                              <1> ; Last Modification: 10/07/2015
    21                              <1> ;	(Unnitialized Disk Parameters Data section for 'DISKIO.INC') 
    22                              <1> 
    23 0001820F <res 00000001>      <1> alignb 2
    24                              <1> 
    25                              <1> ;----------------------------------------
    26                              <1> ;	TIMER DATA AREA 		:
    27                              <1> ;----------------------------------------
    28                              <1> 
    29                              <1> TIMER_LH:	; 16/02/205
    30 00018210 <res 00000002>      <1> TIMER_LOW:      resw	1               ; LOW WORD OF TIMER COUNT
    31 00018212 <res 00000002>      <1> TIMER_HIGH:     resw	1               ; HIGH WORD OF TIMER COUNT
    32 00018214 <res 00000001>      <1> TIMER_OFL:      resb 	1               ; TIMER HAS ROLLED OVER SINCE LAST READ
    33                              <1> 
    34                              <1> ;----------------------------------------
    35                              <1> ;	DISKETTE DATA AREAS		:
    36                              <1> ;----------------------------------------
    37                              <1> 
    38 00018215 <res 00000001>      <1> SEEK_STATUS:	resb	1
    39 00018216 <res 00000001>      <1> MOTOR_STATUS:	resb	1
    40 00018217 <res 00000001>      <1> MOTOR_COUNT:	resb	1
    41 00018218 <res 00000001>      <1> DSKETTE_STATUS:	resb	1
    42 00018219 <res 00000007>      <1> NEC_STATUS:	resb	7
    43                              <1> 
    44                              <1> ;----------------------------------------
    45                              <1> ;	ADDITIONAL MEDIA DATA		:
    46                              <1> ;----------------------------------------
    47                              <1> 
    48 00018220 <res 00000001>      <1> LASTRATE:	resb 	1
    49 00018221 <res 00000001>      <1> HF_STATUS:	resb 	1
    50 00018222 <res 00000001>      <1> HF_ERROR:	resb 	1
    51 00018223 <res 00000001>      <1> HF_INT_FLAG:	resb 	1
    52 00018224 <res 00000001>      <1> HF_CNTRL:	resb 	1
    53 00018225 <res 00000004>      <1> DSK_STATE:	resb 	4
    54 00018229 <res 00000002>      <1> DSK_TRK:	resb 	2
    55                              <1> 
    56                              <1> ;----------------------------------------
    57                              <1> ;	FIXED DISK DATA AREAS		:
    58                              <1> ;----------------------------------------
    59                              <1> 
    60 0001822B <res 00000001>      <1> DISK_STATUS1:	resb 	1		; FIXED DISK STATUS
    61 0001822C <res 00000001>      <1> HF_NUM:		resb 	1		; COUNT OF FIXED DISK DRIVES
    62 0001822D <res 00000001>      <1> CONTROL_BYTE:	resb 	1		; HEAD CONTROL BYTE
    63                              <1> ;@PORT_OFF	resb	1		; RESERVED (PORT OFFSET)
    64                              <1> ;port1_off	resb	1		; Hard disk controller 1 - port offset
    65                              <1> ;port2_off	resb	1		; Hard idsk controller 2 - port offset
    66                              <1> 
    67 0001822E <res 00000002>      <1> alignb 4
    68                              <1> 
    69                              <1> ;HF_TBL_VEC:	resd	1 		; Primary master disk param. tbl. pointer
    70                              <1> ;HF1_TBL_VEC:	resd	1		; Primary slave disk param. tbl. pointer
    71                              <1> HF_TBL_VEC: ; 22/12/2014	
    72 00018230 <res 00000004>      <1> HDPM_TBL_VEC:	resd	1 		; Primary master disk param. tbl. pointer
    73 00018234 <res 00000004>      <1> HDPS_TBL_VEC:	resd	1		; Primary slave disk param. tbl. pointer
    74 00018238 <res 00000004>      <1> HDSM_TBL_VEC:	resd	1 		; Secondary master disk param. tbl. pointer
    75 0001823C <res 00000004>      <1> HDSS_TBL_VEC:	resd	1		; Secondary slave disk param. tbl. pointer
    76                              <1> 
    77                              <1> ; 03/01/2015
    78 00018240 <res 00000001>      <1> LBAMode:     	resb	1
    79                              <1> 
    80                              <1> ; *****************************************************************************
  3629                                  
  3630                                  ;;; Real Mode Data (10/07/2015 - BSS)
  3631                                  
  3632                                  ;alignb 2
  3633                                  
  3634                                  ; 10/01/2016
  3635                                  %include 'trdoskx.s'	; UNINITIALIZED KERNEL (Logical Drive & FS) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.2) - UNINITIALIZED DATA : trdoskx.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 30/08/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 04/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; TRDOS2.ASM (09/11/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; DRV_INIT.ASM [26/09/2009] Last Update: 07/08/2011
    14                              <1> ; MAINPROG.ASM [17/01/2004] Last Update: 09/11/2011
    15                              <1> ; DIR.ASM      [17/01/2004] Last Update: 09/10/2011
    16                              <1> ; CMD_INTR.ASM [29/01/2005] Last update: 09/11/2011
    17                              <1> ; DRV_FAT.ASM  [07/07/2009] Last update: 21/08/2011
    18                              <1> 
    19 00018241 <res 00000003>      <1> alignb 4
    20                              <1> 
    21                              <1> ; MAINPROG.ASM
    22 00018244 <res 00000004>      <1> MainProgCfg_FileSize:   resd 1 ; 14/04/2016
    23 00018248 <res 00000004>      <1> MainProgCfg_LineOffset: resd 1 ; 14/04/2016
    24                              <1> 
    25 0001824C <res 00000004>      <1> Current_VolSerial: resd 1
    26                              <1> 
    27 00018250 <res 00000004>      <1> Current_Dir_FCluster: resd 1
    28                              <1> 
    29 00018254 <res 00000001>      <1> Current_Dir_Level: resb 1
    30 00018255 <res 00000001>      <1> Current_FATType: resb 1
    31 00018256 <res 00000001>      <1> Current_Drv: resb 1
    32 00018257 <res 00000001>      <1> Current_Dir_Drv:   resb 1 ; '?'
    33 00018258 <res 00000001>      <1>                    resb 1 ; ':'
    34 00018259 <res 00000001>      <1> Current_Dir_Root:  resb 1 ; '/' 
    35 0001825A <res 0000005A>      <1> Current_Directory: resb 90
    36 000182B4 <res 00000001>      <1> End_Of_Current_Dir_Str: resb 1
    37 000182B5 <res 00000001>      <1> Current_Dir_StrLen: resb 1   
    38                              <1> 
    39 000182B6 <res 00000001>      <1> CursorColumn: 	resb 1
    40 000182B7 <res 00000001>      <1> CmdArgStart:    resb 1
    41                              <1> 
    42                              <1> ; 03/02/2016
    43 000182B8 <res 0000004E>      <1> Remark:		resb 78
    44                              <1> 
    45 00018306 <res 00000050>      <1> CommandBuffer: 	resb 80
    46                              <1> 
    47 00018356 <res 00000100>      <1> TextBuffer:	resb 256
    48                              <1> 
    49                              <1> MasterBootBuff:
    50 00018456 <res 000001BE>      <1> MasterBootCode: resb 1BEh
    51 00018614 <res 00000040>      <1> PartitionTable: resb 64
    52 00018654 <res 00000002>      <1> MBIDCode: resw 1
    53                              <1> 
    54                              <1> PTable_Buffer:
    55 00018656 <res 00000040>      <1> PTable_hd0: resb 64
    56 00018696 <res 00000040>      <1> PTable_hd1: resb 64
    57 000186D6 <res 00000040>      <1> PTable_hd2: resb 64
    58 00018716 <res 00000040>      <1> PTable_hd3: resb 64
    59                              <1> ; 15/07/2020
    60                              <1> ;PTable_ep0: resb 64
    61                              <1> ;PTable_ep1: resb 64
    62                              <1> ;PTable_ep2: resb 64
    63                              <1> ;PTable_ep3: resb 64
    64                              <1> 
    65                              <1> ; 13/08/2020
    66 00018756 <res 00000001>      <1> scount: resb 1 ; 16/05/2016 (diskio.s, 'int33h:')
    67 00018757 <res 00000001>      <1> 	resb 1
    68 00018758 <res 00000001>      <1> 	resb 1
    69 00018759 <res 00000001>      <1> 	resb 1
    70                              <1> 	
    71 0001875A <res 00000001>      <1> HD_LBA_yes: resb 1
    72 0001875B <res 00000001>      <1> PP_Counter: resb 1
    73 0001875C <res 00000001>      <1> EP_Counter: resb 1
    74                              <1> ; 13/08/2020
    75 0001875D <res 00000001>      <1> LD_Counter: resb 1
    76                              <1> 
    77                              <1> ; 30/08/2020
    78 0001875E <res 00000004>      <1> MBR_EP_StartSector: resd 1 
    79                              <1> 		; Extd partition start sector as in MBR
    80 00018762 <res 00000004>      <1> EP_StartSector: resd 1 ; next extd partition start sector
    81                              <1> 	; 15/07/2020	
    82                              <1>                 ;resd 1
    83                              <1>                 ;resd 1
    84                              <1> 
    85                              <1> ; 20/07/2020
    86 00018766 <res 00000200>      <1> DOSBootSectorBuff: resb 512
    87                              <1> ; 15/07/2020
    88                              <1> ;DOSBootSectorBuff: resb 446 ; 1BEh
    89                              <1> ;MiniPartitionTable: resb 64 ;  40h
    90                              <1> ;MiniPartitionMagic: resw  1 ;  02h 		
    91                              <1> 
    92                              <1> FAT_BuffDescriptor:
    93 00018966 <res 00000004>      <1> FAT_CurrentCluster: resd 1
    94 0001896A <res 00000001>      <1> FAT_BuffValidData: resb 1
    95 0001896B <res 00000001>      <1> FAT_BuffDrvName: resb 1
    96 0001896C <res 00000002>      <1> FAT_BuffOffset: resw 1
    97 0001896E <res 00000004>      <1> FAT_BuffSector: resd 1
    98                              <1> 
    99 00018972 <res 00000004>      <1> FAT_ClusterCounter: resd 1
   100 00018976 <res 00000004>      <1> LastCluster: resd 1
   101                              <1> 
   102                              <1> ; 16/05/2016
   103                              <1> ;; 18/03/2016 (TRDOS v2.0)
   104                              <1> ;ClusterBuffer_Valid: resb 1
   105                              <1> 
   106                              <1> Dir_BuffDescriptor:
   107 0001897A <res 00000001>      <1> DirBuff_DRV: resb 1
   108 0001897B <res 00000001>      <1> DirBuff_FATType: resb 1
   109 0001897C <res 00000001>      <1> DirBuff_ValidData: resb 1
   110 0001897D <res 00000002>      <1> DirBuff_CurrentEntry: resw 1
   111 0001897F <res 00000002>      <1> DirBuff_LastEntry: resw 1
   112 00018981 <res 00000004>      <1> DirBuff_Cluster: resd 1 
   113 00018985 <res 00000002>      <1> DirBuffer_Size: resw 1
   114                              <1> ;DirBuff_EntryCounter: resw 1
   115                              <1> 
   116                              <1> ; 01/02/2016
   117                              <1> ; these are on (real mode) segment 8000h and later
   118                              <1> ; FAT_Buffer:	resb 1536 ; 3 sectors
   119                              <1> ; Dir_Buffer:	resb 512*32
   120                              <1> ; Logical_DOSDisks:  resb 6656 ; 26 * 256 bytes
   121                              <1> 
   122                              <1> ; 18/01/2016
   123                              <1> 
   124 00018987 <res 00000004>      <1> FreeClusterCount: resd 1
   125                              <1> 
   126 0001898B <res 00000004>      <1> VolSize_Unit1:   resd 1
   127 0001898F <res 00000004>      <1> VolSize_Unit2:   resd 1
   128                              <1> 
   129 00018993 <res 00000004>      <1> Vol_Tot_Sec_Str_Start:	    resd 1
   130 00018997 <res 0000000A>      <1> Vol_Tot_Sec_Str: 	    resb 10
   131 000189A1 <res 00000001>      <1> Vol_Tot_Sec_Str_End:	    resb 1
   132 000189A2 <res 00000001>      <1> resb 1
   133 000189A3 <res 00000004>      <1> Vol_Free_Sectors_Str_Start: resd 1
   134 000189A7 <res 0000000A>      <1> Vol_Free_Sectors_Str:	    resb 10				
   135 000189B1 <res 00000001>      <1> Vol_Free_Sectors_Str_End:   resb 1
   136                              <1> 
   137                              <1> ; 10/02/2016
   138 000189B2 <res 00000001>      <1> RUN_CDRV: resb 1 ; CMD_INTR.ASM  ; 09/11/2011
   139                              <1> 
   140                              <1> ; 24/01/2016
   141 000189B3 <res 00000080>      <1> PATH_Array:     resb 128 ; DIR.ASM ; 09/10/2011
   142                              <1> ; 06/02/2016
   143 00018A33 <res 00000004>      <1> CCD_DriveDT:	resd 1 ; DIR.ASM ; (word)
   144 00018A37 <res 00000001>      <1> CCD_Level:	resb 1 ; DIR.ASM
   145 00018A38 <res 00000001>      <1> Last_Dir_Level:	resb 1 ; DIR.ASM
   146                              <1> ;
   147 00018A39 <res 00000002>      <1> CDLF_AttributesMask: resw 1 ; DIR.ASM
   148 00018A3B <res 00000004>      <1> CDLF_FNAddress:	resd 1 ; DIR.ASM (word)
   149 00018A3F <res 00000002>      <1> CDLF_DEType:	resw 1 ; DIR.ASM
   150                              <1> ;
   151 00018A41 <res 00000001>      <1> CD_COMMAND:	resb 1 ; DIR.ASM
   152                              <1> 
   153 00018A42 <res 00000002>      <1> alignb 4
   154                              <1> 
   155                              <1> ; 29/01/2016
   156 00018A44 <res 00000001>      <1> Program_Exit:	resb 1 ; CMD_INTR.ASM  ; 09/11/2011
   157                              <1> 
   158                              <1> ;alignb 4
   159                              <1> ; 23/02/2016
   160 00018A45 <res 00000001>      <1> disk_rw_op:	resb 1 ;  0 = disk read, 1 = disk write
   161                              <1> ;disk_rw_spt:	resb 1 ; sectors per track (<= 63) /// (<256)
   162                              <1> ; 31/01/2016
   163 00018A46 <res 00000001>      <1> retry_count: 	resb 1 ; DISK_IO.ASM ; 20/07/2011 (CHS_RetryCount)
   164 00018A47 <res 00000001>      <1> disk_rw_err: 	resb 1 ; DISK_IO.ASM ; (Disk_IO_err_code)
   165 00018A48 <res 00000004>      <1> sector_count:	resd 1 ; DISK_IO.ASM ; (Disk_RW_SectorCount)
   166                              <1> 
   167                              <1> ; 06/02/2016 (long name)
   168 00018A4C <res 00000002>      <1> FDE_AttrMask:	   resw 1 ; DIR.ASM
   169 00018A4E <res 00000002>      <1> AmbiguousFileName: resw 1 ; DIR.ASM
   170 00018A50 <res 00000001>      <1> PreviousAttr:	   resb 1 ; DIR.ASM
   171                              <1> ;	
   172 00018A51 <res 00000001>      <1> LongNameFound:   resb 1	  ; DIR.ASM
   173 00018A52 <res 00000001>      <1> LFN_EntryLength: resb 1   ; DIR.ASM
   174 00018A53 <res 00000001>      <1> LFN_CheckSum:    resb 1   ; DIR.ASM
   175 00018A54 <res 00000084>      <1> LongFileName:    resb 132 ; DIR.ASM
   176                              <1> 
   177                              <1> ;PATH_Array_Ptr: resw 1 ; DIR.ASM
   178 00018AD8 <res 00000001>      <1> PATH_CDLevel:	 resb 1 ; DIR.ASM
   179 00018AD9 <res 00000001>      <1> PATH_Level:	 resb 1 ; DIR.ASM
   180                              <1> 
   181                              <1> ; 07/02/2016
   182 00018ADA <res 0000000D>      <1> Dir_File_Name:	resb 13 ; DIR.ASM ; 09/10/2011
   183                              <1> 
   184                              <1> ; 10/02/2016
   185 00018AE7 <res 0000000D>      <1> Dir_Entry_Name:	resb 13 ; DIR.ASM
   186                              <1> 
   187                              <1> alignb 2
   188                              <1> 
   189 00018AF4 <res 00000002>      <1> AttributesMask: resw 1 ; CMD_INTR.ASM ; 09/11/2011
   190                              <1> 
   191                              <1> ; 10/02/2016 (128 bytes -> 126 bytes)
   192                              <1> ; 08/02/2016
   193                              <1> ;FFF Structure (128 bytes) ; DIR.ASM ; 09/10/2011
   194 00018AF6 <res 00000001>      <1> FindFile_Drv:		  resb 1
   195 00018AF7 <res 00000041>      <1> FindFile_Directory:	  resb 65
   196 00018B38 <res 0000000D>      <1> FindFile_Name:		  resb 13
   197                              <1> FindFile_LongNameEntryLength:
   198 00018B45 <res 00000001>      <1> FindFile_LongNameYes: 	  resb 1 ; Sign for longname procedures
   199                              <1> ;Above 80 bytes form
   200                              <1> ;TR-DOS Source/Destination File FullName Format/Structure
   201 00018B46 <res 00000002>      <1> FindFile_AttributesMask:  resw 1
   202 00018B48 <res 00000020>      <1> FindFile_DirEntry:	  resb 32
   203 00018B68 <res 00000004>      <1> FindFile_DirFirstCluster: resd 1
   204 00018B6C <res 00000004>      <1> FindFile_DirCluster:	  resd 1
   205 00018B70 <res 00000002>      <1> FindFile_DirEntryNumber:  resw 1
   206 00018B72 <res 00000002>      <1> FindFile_MatchCounter:	  resw 1
   207 00018B74 <res 00000002>      <1> FindFile_Reserved:	  resw 1 ; 06/03/2016
   208                              <1> 
   209 00018B76 <res 00000004>      <1> First_Path_Pos: resd 1	; DIR.ASM ; 09/10/2011
   210 00018B7A <res 00000004>      <1> Last_Slash_Pos: resd 1	; DIR.ASM 
   211                              <1> 
   212                              <1> ; 10/02/2016
   213 00018B7E <res 00000002>      <1> File_Count:     resw 1 	; DIR.ASM ; 09/10/2011
   214 00018B80 <res 00000002>      <1> Dir_Count:      resw 1
   215 00018B82 <res 00000004>      <1> Total_FSize:    resd 1
   216 00018B86 <res 00000004>      <1> TFS_Dec_Begin:  resd 1
   217 00018B8A <res 0000000A>      <1>                 resb 10
   218 00018B94 <res 00000001>      <1> TFS_Dec_End:    resb 1
   219                              <1> 
   220 00018B95 <res 00000001>      <1> PrintDir_RowCounter: resb 1
   221                              <1> 
   222 00018B96 <res 00000002>      <1> alignb 4
   223                              <1> ; 15/02/2015 ('show' command variables)
   224 00018B98 <res 00000004>      <1> Show_FDT:	resd 1
   225 00018B9C <res 00000004>      <1> Show_LDDDT:	resd 1
   226 00018BA0 <res 00000004>      <1> Show_Cluster:	resd 1
   227 00018BA4 <res 00000004>      <1> Show_FileSize:	resd 1
   228 00018BA8 <res 00000004>      <1> Show_FilePointer: resd 1
   229 00018BAC <res 00000002>      <1> Show_ClusterPointer: resw 1
   230 00018BAE <res 00000002>      <1> Show_ClusterSize: resw 1
   231 00018BB0 <res 00000001>      <1> Show_RowCount:	resb 1
   232                              <1> 
   233 00018BB1 <res 00000003>      <1> alignb 4
   234                              <1> ; 21/02/2016
   235 00018BB4 <res 00000004>      <1> DelFile_FNPointer:	resd 1 ; ; CMD_INTR.ASM (word) ; 09/11/2011
   236                              <1> ; 27/02/2016
   237                              <1> ; DIR.ASM (09/10/2011)
   238 00018BB8 <res 00000004>      <1> DelFile_FCluster:	resd 1
   239 00018BBC <res 00000002>      <1> DelFile_EntryCounter:	resw 1
   240 00018BBE <res 00000001>      <1> DelFile_LNEL:		resb 1
   241 00018BBF <res 00000001>      <1> resb 1
   242                              <1> 
   243                              <1> ; DIR.ASM
   244 00018BC0 <res 00000004>      <1> mkdir_DirName_Offset: 	resd 1
   245 00018BC4 <res 00000004>      <1> mkdir_FFCluster:	resd 1
   246 00018BC8 <res 00000004>      <1> mkdir_LastDirCluster:	resd 1
   247 00018BCC <res 00000004>      <1> mkdir_FreeSectors:	resd 1
   248 00018BD0 <res 00000002>      <1> mkdir_attrib:		resw 1 
   249 00018BD2 <res 00000001>      <1> mkdir_SecPerClust:	resb 1
   250 00018BD3 <res 00000001>      <1> mkdir_add_new_cluster:	resb 1
   251 00018BD4 <res 0000000D>      <1> mkdir_Name:		resb 13
   252 00018BE1 <res 00000002>      <1> resw 1 ; 01/03/2016
   253                              <1> ; 27/02/2016
   254 00018BE3 <res 00000001>      <1> RmDir_MultiClusters:	resb 1  
   255 00018BE4 <res 00000004>      <1> RmDir_DirEntryOffset:	resd 1 ; 01/03/2016 (word -> dword)
   256 00018BE8 <res 00000004>      <1> RmDir_ParentDirCluster: resd 1
   257 00018BEC <res 00000004>      <1> RmDir_DirLastCluster:   resd 1
   258 00018BF0 <res 00000004>      <1> RmDir_PreviousCluster:  resd 1
   259                              <1> ; 22/02/2016
   260 00018BF4 <res 00000001>      <1> UPDLMDT_CDirLevel:	resb 1
   261 00018BF5 <res 00000004>      <1> UPDLMDT_CDirFCluster:	resd 1
   262                              <1> 	
   263 00018BF9 <res 00000003>      <1> alignb 4
   264                              <1> ; DRV_FAT.ASM ; 21/08/2011
   265 00018BFC <res 00000004>      <1> gffc_next_free_cluster:  resd 1
   266 00018C00 <res 00000004>      <1> gffc_first_free_cluster: resd 1
   267 00018C04 <res 00000004>      <1> gffc_last_free_cluster:  resd 1
   268                              <1> 
   269                              <1> ;29/04/2016
   270                              <1> Cluster_Index: ; resd 1
   271                              <1> ; 22/02/2016
   272 00018C08 <res 00000004>      <1> ClusterValue:	resd 1
   273                              <1> ; 04/03/2016
   274 00018C0C <res 00000001>      <1> Attributes:	resb 1 
   275                              <1> ;;CFS_error:  resb 1 ;; 01/03/2016
   276 00018C0D <res 00000001>      <1> resb 1
   277 00018C0E <res 00000001>      <1> CFS_OPType: resb 1
   278 00018C0F <res 00000001>      <1> CFS_Drv:    resb 1
   279 00018C10 <res 00000004>      <1> CFS_CC:	    resd 1
   280 00018C14 <res 00000004>      <1> CFS_FAT32FSINFOSEC: resd 1
   281 00018C18 <res 00000004>      <1> CFS_FAT32FC: resd 1
   282                              <1> 
   283                              <1> ; 27/02/2016
   284                              <1> ;alignb 4
   285 00018C1C <res 00000004>      <1> glc_prevcluster: resd 1 ; DRV_FAT.ASM (21/08/2011)
   286                              <1> ; 22/10/2016
   287 00018C20 <res 00000004>      <1> glc_index:	 resd 1 ;  Last Cluster Index (22/10/2016)	
   288                              <1> 
   289                              <1> ; DIR.ASM
   290 00018C24 <res 00000002>      <1> DLN_EntryNumber: resw 1
   291 00018C26 <res 00000001>      <1> DLN_40h:	 resb 1
   292                              <1> ; 28/02/2016
   293 00018C27 <res 00000001>      <1> TCC_FATErr:	 resb 1 ; DRV_FAT.ASM
   294                              <1> 
   295                              <1> alignb 4
   296                              <1> ; DIR.ASM (09/10/2011)
   297 00018C28 <res 00000002>      <1> LCDE_EntryIndex: resw 1 ; LCDE_EntryOffset
   298 00018C2A <res 00000002>      <1> LCDE_ClusterSN:  resw 1
   299 00018C2C <res 00000004>      <1> LCDE_Cluster: 	 resd 1
   300 00018C30 <res 00000004>      <1> LCDE_ByteOffset: resd 1
   301                              <1> 
   302                              <1> ;alignb4
   303                              <1> ; 06/03/2016 (word -> dword)
   304                              <1> ; CMD_INTR.ASM (01/08/2010)
   305 00018C34 <res 00000004>      <1> SourceFilePath:	     resd 1
   306 00018C38 <res 00000004>      <1> DestinationFilePath: resd 1
   307                              <1> 
   308                              <1> ;alignb 4
   309                              <1> ; 06/03/2016
   310                              <1> ; FILE.ASM (09/10/2011)
   311                              <1> ;Source File Structure (same with 'Find File' Structure)
   312 00018C3C <res 00000001>      <1> SourceFile_Drv:			resb 1
   313 00018C3D <res 00000041>      <1> SourceFile_Directory:		resb 65
   314 00018C7E <res 0000000D>      <1> SourceFile_Name:		resb 13
   315                              <1> SourceFile_LongNameEntryLength: 
   316 00018C8B <res 00000001>      <1> SourceFile_LongNameYes:		resb 1 ; Sign for longname procedures
   317                              <1> ;Above 80 bytes
   318                              <1> ;is TR-DOS Source File FullName Format/Structure
   319 00018C8C <res 00000002>      <1> SourceFile_AttributesMask:	resw 1
   320 00018C8E <res 00000020>      <1> SourceFile_DirEntry:		resb 32
   321 00018CAE <res 00000004>      <1> SourceFile_DirFirstCluster:	resd 1
   322 00018CB2 <res 00000004>      <1> SourceFile_DirCluster:		resd 1
   323 00018CB6 <res 00000002>      <1> SourceFile_DirEntryNumber:	resw 1
   324 00018CB8 <res 00000002>      <1> SourceFile_MatchCounter:	resw 1
   325                              <1> ; 16/03/2016
   326 00018CBA <res 00000001>      <1> SourceFile_SecPerClust:		resb 1
   327 00018CBB <res 00000001>      <1> SourceFile_Reserved:		resb 1
   328                              <1> ; Above is 128 bytes
   329                              <1> 
   330                              <1> ;Destination File Structure (same with 'Find File' Structure)
   331 00018CBC <res 00000001>      <1> DestinationFile_Drv:		resb 1
   332 00018CBD <res 00000041>      <1> DestinationFile_Directory: 	resb 65
   333 00018CFE <res 0000000D>      <1> DestinationFile_Name:		resb 13
   334                              <1> DestinationFile_LongNameEntryLength:
   335 00018D0B <res 00000001>      <1> DestinationFile_LongNameYes:	resb 1 ; Sign for longname procedures
   336                              <1> ;Above 80 bytes
   337                              <1> ;is TR-DOS Destination File FullName Format/Structure
   338 00018D0C <res 00000002>      <1> DestinationFile_AttributesMask: resw 1
   339 00018D0E <res 00000020>      <1> DestinationFile_DirEntry:	resb 32
   340 00018D2E <res 00000004>      <1> DestinationFile_DirFirstCluster: resd 1
   341 00018D32 <res 00000004>      <1> DestinationFile_DirCluster:	resd 1
   342 00018D36 <res 00000002>      <1> DestinationFile_DirEntryNumber: resw 1
   343 00018D38 <res 00000002>      <1> DestinationFile_MatchCounter:	resw 1
   344                              <1> ; 16/03/2016
   345 00018D3A <res 00000001>      <1> DestinationFile_SecPerClust:	resb 1
   346 00018D3B <res 00000001>      <1> DestinationFile_Reserved:	resb 1
   347                              <1> ; Above is 128 bytes
   348                              <1> 
   349                              <1> ; 24/04/2016
   350 00018D3C <res 00000002>      <1> resw 1
   351                              <1> 
   352                              <1> ; 10/03/2016
   353                              <1> ; FILE.ASM
   354 00018D3E <res 00000001>      <1> move_cmd_phase:	   resb 1
   355 00018D3F <res 00000001>      <1> msftdf_sf_df_drv:  resb 1
   356 00018D40 <res 00000004>      <1> msftdf_drv_offset: resd 1
   357                              <1> 
   358                              <1> ; 11/03/2016
   359                              <1> ; DRV_FAT.ASM (21/08/2011)
   360 00018D44 <res 00000004>      <1> FAT_anc_LCluster:  resd 1
   361 00018D48 <res 00000004>      <1> FAT_anc_FFCluster: resd 1
   362                              <1> 
   363                              <1> ;alignb 4
   364                              <1> 
   365                              <1> ; 14/03/2016
   366                              <1> ; TRDOS 386 = TRDOS v2.0 feature only !
   367                              <1> ; 'allocate_memory_block' in 'memory.s'
   368 00018D4C <res 00000004>      <1> mem_ipg_count:	resd 1 ; page count (for contiguous allocation)
   369 00018D50 <res 00000004>      <1> mem_pg_count:	resd 1 ; page count (for count down)
   370 00018D54 <res 00000004>      <1> mem_aperture:	resd 1 ; contiguous free pages (current)
   371 00018D58 <res 00000004>      <1> mem_max_aperture: resd 1 ; maximum value of contiguous free pages
   372 00018D5C <res 00000004>      <1> mem_pg_pos:	resd 1 ; mem. position (page #) of current aperture
   373 00018D60 <res 00000004>      <1> mem_max_pg_pos: resd 1 ; mem. position (page #) of max. aperture
   374                              <1> 
   375                              <1> ; 15/03/2016
   376                              <1> ; FILE.ASM ('copy_source_file_to_destination_file')
   377 00018D64 <res 00000001>      <1> copy_cmd_phase:       resb 1
   378 00018D65 <res 00000001>      <1> csftdf_rw_err:	      resb 1
   379 00018D66 <res 00000001>      <1> DestinationFileFound: resb 1
   380 00018D67 <res 00000001>      <1> csftdf_cdrv: 	      resb 1
   381 00018D68 <res 00000004>      <1> csftdf_filesize:      resd 1
   382                              <1> ; TRDOS386 (TRDOS v2.0)
   383 00018D6C <res 00000004>      <1> csftdf_sf_mem_addr:   resd 1
   384 00018D70 <res 00000004>      <1> csftdf_sf_mem_bsize:  resd 1
   385                              <1> ;
   386                              <1> 
   387 00018D74 <res 00000004>      <1> csftdf_sf_cluster:    resd 1 ; 16/03/2016
   388 00018D78 <res 00000004>      <1> csftdf_df_cluster:    resd 1
   389                              <1> ; 16/03/2016
   390 00018D7C <res 00000004>      <1> csftdf_r_size:        resd 1
   391 00018D80 <res 00000004>      <1> csftdf_w_size:        resd 1
   392 00018D84 <res 00000004>      <1> csftdf_sf_rbytes:     resd 1
   393 00018D88 <res 00000004>      <1> csftdf_df_wbytes:     resd 1
   394 00018D8C <res 00000001>      <1> csftdf_percentage:    resb 1
   395                              <1> ; 17/03/2016
   396 00018D8D <res 00000001>      <1> csftdf_videopage:     resb 1
   397 00018D8E <res 00000002>      <1> csftdf_cursorpos:     resw 1
   398 00018D90 <res 00000004>      <1> csftdf_sf_drv_dt:     resd 1
   399 00018D94 <res 00000004>      <1> csftdf_df_drv_dt:     resd 1
   400                              <1> 
   401                              <1> ; 21/03/2016
   402                              <1> ; 20/03/2016
   403                              <1> ; FILE.ASM
   404 00018D98 <res 00000004>      <1> createfile_Name_Offset:  resd 1
   405 00018D9C <res 00000004>      <1> createfile_FreeSectors:  resd 1 
   406 00018DA0 <res 00000004>      <1> createfile_size:         resd 1
   407 00018DA4 <res 00000004>      <1> createfile_FFCluster:    resd 1 ; 11/03/2016
   408 00018DA8 <res 00000004>      <1> createfile_LastDirCluster: resd 1
   409 00018DAC <res 00000004>      <1> createfile_Cluster:      resd 1
   410 00018DB0 <res 00000004>      <1> createfile_PCluster:     resd 1
   411 00018DB4 <res 00000001>      <1> createfile_attrib:	 resb 1
   412 00018DB5 <res 00000001>      <1> createfile_SecPerClust:  resb 1
   413 00018DB6 <res 00000002>      <1> createfile_DirIndex:     resw 1
   414 00018DB8 <res 00000004>      <1> createfile_CCount:	 resd 1
   415 00018DBC <res 00000002>      <1> createfile_BytesPerSec:	 resw 1 ; 23/03/2016
   416 00018DBE <res 00000001>      <1> createfile_wfc:	         resb 1
   417 00018DBF <res 00000001>      <1> createfile_UpdatePDir:	 resb 1 ; 31/03/2016
   418                              <1> 
   419                              <1> ;alignb 4
   420                              <1> 
   421                              <1> ; 11/04/2016
   422 00018DC0 <res 00000002>      <1> env_var_length:	   resw 1
   423                              <1> 
   424 00018DC2 <res 00000002>      <1> alignb 4
   425                              <1> 
   426                              <1> ; 25/04/2016
   427 00018DC4 <res 00000001>      <1> readi.valid:	resb 1 ; valid data (>0 = valid for readi)
   428 00018DC5 <res 00000001>      <1> readi.drv:	resb 1 ; drive number (0, 1,2,3,4..)
   429 00018DC6 <res 00000001>      <1> readi.spc:	resb 1 ; sectors per cluster for 'readi' drive
   430 00018DC7 <res 00000001>      <1> readi.s_index:  resb 1 ; sector index in current cluster (buffer)
   431 00018DC8 <res 00000004>      <1> readi.sector:	resd 1 ; current disk sector
   432 00018DCC <res 00000002>      <1> readi.bpc:	resw 1 ; bytes per cluster - 1
   433 00018DCE <res 00000002>      <1> readi.offset:	resw 1 ; byte offset in cluster buffer
   434 00018DD0 <res 00000004>      <1> readi.cluster:  resd 1 ; current cluster number
   435 00018DD4 <res 00000004>      <1> readi.c_index:	resd 1 ; cluster index of the current cluster (0,1,2,3..)
   436 00018DD8 <res 00000004>      <1> readi.fclust:	resd 1 ; first cluster of the current cluster
   437 00018DDC <res 00000004>      <1> readi.fs_index: resd 1 ; sector index in disk/file section (for Singlix FS)
   438                              <1> ;readi.buffer:	resd 1 ; readi sector buffer address
   439                              <1> 
   440                              <1> ;alignb 4
   441                              <1> 
   442 00018DE0 <res 00000001>      <1> writei.valid:	resb 1 ; valid data (>0 = valid for writei)
   443 00018DE1 <res 00000001>      <1> writei.drv:	resb 1 ; drive number (0, 1,2,3,4..)
   444 00018DE2 <res 00000001>      <1> writei.spc:	resb 1 ; sectors per cluster for 'writei' drive
   445 00018DE3 <res 00000001>      <1> writei.s_index: resb 1 ; sector index in current cluster (buffer)
   446 00018DE4 <res 00000004>      <1> writei.sector:	resd 1 ; current disk sector
   447 00018DE8 <res 00000002>      <1> writei.bpc:	resw 1 ; bytes per cluster - 1
   448 00018DEA <res 00000002>      <1> writei.offset:	resw 1 ; byte offset in cluster buffer
   449 00018DEC <res 00000004>      <1> writei.cluster: resd 1 ; current cluster number
   450 00018DF0 <res 00000004>      <1> writei.c_index:	resd 1 ; cluster index of the current cluster (0,1,2,3..)
   451 00018DF4 <res 00000004>      <1> writei.fclust:  resd 1 ; first cluster of the current cluster
   452 00018DF8 <res 00000004>      <1> writei.fs_index: resd 1 ; sector index in disk/file section (for Singlix FS)
   453                              <1> ;writei.buffer:	resd 1 ; writei sector buffer address
   454 00018DFC <res 00000004>      <1> writei.lclust:	resd 1 ; writei last cluster (mget_w) ; 23/10/2016
   455 00018E00 <res 00000004>      <1> writei.l_index:	resd 1 ; writei last cluster index (mget_w) ; 23/10/2016
   456 00018E04 <res 00000001>      <1> writei.ofn:	resb 1 ; open file number (to be written) ; 23/10/2016
   457                              <1> 
   458 00018E05 <res 00000003>      <1> alignb 4
   459                              <1> 
   460                              <1> ; 29/04/2016
   461 00018E08 <res 00000004>      <1> Run_CDirFC:	resd 1
   462 00018E0C <res 00000001>      <1> Run_Auto_Path:	resb 1
   463 00018E0D <res 00000001>      <1> Run_Manual_Path: resb 1 ; 0 -> auto path sequence needed
   464 00018E0E <res 00000001>      <1> EXE_ID:		resb 1	
   465 00018E0F <res 00000001>      <1> EXE_dot:	resb 1
   466                              <1> 
   467                              <1> ; 06/05/2016
   468 00018E10 <res 00000004>      <1> mainprog_return_addr: resd 1
   469 00018E14 <res 00000004>      <1> last_error:	resd 1  ; this will be used to return error code to MainProg
   470                              <1> 			; 'lasterror' keyword will be used later to get the
   471                              <1> 			; last error code/number/status.
   472                              <1> ; 12/05/2016
   473 00018E18 <res 00000004>      <1> video_eax:	resd 1  ; eax return value of video function
   474                              <1> 
   475                              <1> ; 01/06/2016
   476 00018E1C <res 00000004>      <1> user_buffer:	resd 1  ; 'diskio.s' (INT 33h, Function 08h, floppy disk type)
   477                              <1> 
   478                              <1> ; 21/05/2016 - TRDOS 386 ('swap/switch', 'rswap', [u.pri])
   479 00018E20 <res 00000001>      <1> priority:	resb 1  ; running priority level of process (0,1,2)
   480                              <1> 			; (run queue which is process comes from)
   481                              <1> ; 22/05/2016 - TRDOS 386 ('set_run_sequence', 'rtc_int', 'u_timer')
   482 00018E21 <res 00000001>      <1> p_change:	resb 1  ; process change status (for timer events)
   483                              <1> ; 23/05/2016 - TRDOS 386 ('clock')
   484 00018E22 <res 00000001>      <1> multi_tasking:	resb 1   ; Multi Tasking status (0 = disabled, >0 = enabled)
   485                              <1> 			; (EBX will return with user buffer addr or disk type)
   486                              <1> ; 07/06/2016
   487 00018E23 <res 00000001>      <1> timer_events:	resb 1  ; number of (active) timer events, <= 16		
   488                              <1> 
   489                              <1> ; 24/06/2016
   490 00018E24 <res 00000001>      <1> w_str_cmd:	resb 1	; WRITE_STRING command (0,1,2,3) ; video.s
   491 00018E25 <res 00000001>      <1> p_crt_mode:	resb 1  ; previous video mode (=3 or 0), backup mark/sign
   492                              <1> ; 26/06/2016
   493 00018E26 <res 00000001>      <1> p_crt_page:	resb 1  ; previous active page (for 'set_mode')
   494                              <1> ; 04/07/2016
   495 00018E27 <res 00000001>      <1> noclearmem:	resb 1  ; if set, 'SET MODE' (INT 31h) function (AH = 4)
   496                              <1> 			; will not clear the video memory
   497                              <1> 			; (usable for graphics modes only)
   498                              <1> alignb 2
   499 00018E28 <res 00000002>      <1> CRT_LEN:	resw 1  ; length of regen buffer in bytes
   500 00018E2A <res 00000010>      <1> cursor_pposn:	resw 8  ; cursor positions backup
   501                              <1> 
   502                              <1> ; 10/07/2016 ('VGA_FONT_SETUP', INT 43H address for x86 real mode bios)
   503 00018E3A <res 00000004>      <1> VGA_INT43H:	resd 1	; 0 = default (not configured by user)
   504                              <1> 			; 0FFFFFFFFh = user defined fonts
   505                              <1> 			; address:
   506                              <1> 			; 	vgafont8
   507                              <1> 			; 	vgafont16
   508                              <1> 			; 	vgafont14
   509                              <1> 
   510                              <1> ; 25/07/2016
   511 00018E3E <res 00000001>      <1> VGA_MTYPE:	resb 1  ; 0=CTEXT,1=MTEXT,2=CGA,3=PLANAR1,4=PLANAR4,5=LINEAR 
   512                              <1> 
   513                              <1> ; 23/10/2016
   514 00018E3F <res 00000001>      <1> setfmod		resb 1	; update last modification date&time sign (if >0)
   515                              <1> 			; (it is Open File Number + 1, if > 0)
   516                              <1> alignb 4
   517                              <1> 
   518                              <1> ; 16/10/2016
   519 00018E40 <res 00000004>      <1> FFF_UBuffer:	resd 1  ; User's buffer address for FFF & FNF system calls 
   520                              <1> ; 15/10/2016
   521 00018E44 <res 00000001>      <1> FFF_Valid:	resb 1  ; Find First File Structure validation byte
   522                              <1> 			; 0  = invalid (Find Next File can't use FFF struct)
   523                              <1> 			; >0 = valid, return type for FFF and Find Next File
   524                              <1> 			; 24 = basic parameters, 24 bytes
   525                              <1> 			; 128 = entire FFF structure/table, 128 bytes
   526                              <1> ; 16/10/2016 (FFF_Attrib: resw 1)
   527 00018E45 <res 00000001>      <1> FFF_Attrib:	resb 1	; Find First File attributes for Find Next File (LB)
   528 00018E46 <res 00000001>      <1> FFF_RType:	resb 1  ; FFF return type (0 = Basic, >0 = complete) (HB)
   529                              <1> ; 16/10/2016 - 05/10/2016 (Set Working Path)
   530 00018E47 <res 00000001>      <1> SWP_inv_fname:	resb 1	; Set Working Path - Invalid File Name
   531 00018E48 <res 00000002>      <1> SWP_Mode:	resw 1	; Set Working Path - Mode
   532 00018E4A <res 00000001>      <1> SWP_DRV:	resb 1	; Set Working Path - Drive	
   533 00018E4B <res 00000001>      <1> SWP_DRV_chg:	resb 1	; Set Working Path - Drive Change
   534                              <1> 
   535                              <1> ; 27/02/2017
   536 00018E4C <res 00000001>      <1> fpready:	resb 1	; '80387 fpu is ready' flag	
   537                              <1> 
   538                              <1> ; 08/10/2016
   539 00018E4D <res 00000009>      <1> device_name:    resb 9  ; capitalized (and zero padded) device canem 
   540                              <1> 			; (example: "TTY0",0,0,0,0,0")
   541                              <1> 
   542 00018E56 <res 00000002>      <1> alignb 4
   543                              <1> 
   544                              <1> ; 08/10/2016
   545                              <1> ; 07/10/2016
   546                              <1> ; Table of kernel devices (which do not use installable device drivers)
   547                              <1> ; has been coded into KERNEL (trdosk9.s) 
   548                              <1> ; 07/10/2016
   549                              <1> ; 8 installable device drivers available to install (NUMIDEV)
   550 00018E58 <res 00000020>      <1> IDEV_PGDIR: resd NUMIDEV
   551                              <1> 			; Page directories of installable device drivers
   552                              <1> 			;
   553                              <1> 			; Note: Virtual start address is always 400000h
   554                              <1> 			; (end of the 1st 4MB). [org 400000h]
   555                              <1> 			; Segments: KCODE, KDATA
   556                              <1> 			; Method: call 400000h (after changing page dir) 	
   557                              <1> 			; Query code located at the start (400000h).
   558                              <1> 			; Query code returns with
   559                              <1> 			;   eax = device type and driver version
   560                              <1> 			;         AL = Device Type minor
   561                              <1> 			;         AH = Device Type major
   562                              <1> 			;         Byte 16-23 : Version minor
   563                              <1> 			;	  Byte 24-31 : Version major - 1
   564                              <1> 			;		       (0:0 -> 1.0)
   565                              <1> 			;   ebx = initialization code address
   566                              <1> 			;   ecx = configuration table address
   567                              <1> 			;   edx = description table address
   568                              <1> 			;   esi = device (default) name address (ASCIIZ)
   569                              <1> 			;	 (name has "/DEV/" prefix)		
   570                              <1> 			;   edi = dispatch table address
   571                              <1> 			;        (for calling kernel-device functions)
   572                              <1> 			;   ebp = address table address
   573                              <1> 			; Initialization code returns with
   574                              <1> 			;   eax = open code address
   575                              <1> 			;   ecx = close code address 
   576                              <1> 			;   ebx = read code address
   577                              <1> 			;   edx = write code address 	
   578                              <1> 			;   esi = IOCTL code address
   579                              <1> 			;   edi = dispatch table address
   580                              <1> 			;   ebp = address table address
   581                              <1> 			; Address Table:
   582                              <1> 			;    Offset 0  : open code address
   583                              <1> 			;    Offset 4  : read code address
   584                              <1> 			;    Offset 8  : write code address
   585                              <1> 			;    Offset 12 : close code address
   586                              <1> 			;    Offset 16 : IOCTL code address
   587                              <1> 			;    Offset 20 : initialization code address
   588                              <1> 			;    Offset 24 : description table address
   589                              <1> 			;    Offset 28 : configuration table address
   590                              <1> 			;    Offset 32 : device name address
   591                              <1> 			;    Offset 36 : dispatch table address
   592                              <1> 			;          (for calling kernel-device functions)
   593                              <1> 
   594 00018E78 <res 00000040>      <1> IDEV_NAME:  resb 8*NUMIDEV 
   595                              <1> 			; 8 byte names of installable device drivers
   596                              <1> 
   597 00018EB8 <res 00000008>      <1> IDEV_TYPE:  resb NUMIDEV ; Driver type of installable device drivers
   598 00018EC0 <res 00000008>      <1> IDEV_FLAGS: resb NUMIDEV ; Device access parameters for installable
   599                              <1>                          ; device drivers (These values are set while
   600                              <1> 			 ; the device driver is being loaded.)
   601 00018EC8 <res 00000020>      <1> IDEV_OADDR: resd NUMIDEV ; open function addr for installable dev driver
   602 00018EE8 <res 00000020>      <1> IDEV_CADDR: resd NUMIDEV ; close function addr for installable dev driver
   603 00018F08 <res 00000020>      <1> IDEV_RADDR: resd NUMIDEV ; read function addr for installable dev driver
   604 00018F28 <res 00000020>      <1> IDEV_WADDR: resd NUMIDEV ; write function addr for installable dev driver
   605                              <1> 	
   606                              <1> ; 08/10/2016	
   607                              <1> ; 07/10/2016
   608                              <1> ; Device Open and Access parameters
   609 00018F48 <res 0000001E>      <1> DEV_ACCESS:	 resb NUMOFDEVICES   ; bit 0 = accessable by normal users
   610                              <1> 				     ; bit 1 = read access permission
   611                              <1> 				     ; bit 2 = write access permission
   612                              <1> 				     ; bit 3 = IOCTL permission to users
   613                              <1> 				     ; bit 4 = block device if it is set	
   614                              <1> 				     ; bit 5 = 16 bit or 1024 byte data
   615                              <1> 				     ; bit 6 = 32 bit or 2048 byte data
   616                              <1> 				     ; bit 7 = installable device driver
   617 00018F66 <res 0000001E>      <1> DEV_R_OWNER:	 resb NUMOFDEVICES   ; Reading owner no (u.uid) of devices		
   618 00018F84 <res 0000001E>      <1> DEV_R_OPENCOUNT: resb NUMOFDEVICES   ; Reading open count 
   619 00018FA2 <res 0000001E>      <1> DEV_W_OWNER:	 resb NUMOFDEVICES   ; Writing owner no (u.uid) of devices		
   620 00018FC0 <res 0000001E>      <1> DEV_W_OPENCOUNT: resb NUMOFDEVICES   ; Writing open count
   621 00018FDE <res 0000001E>      <1> DEV_DRIVER:	 resb NUMOFDEVICES   ; device driver number (1 to 7Fh)
   622                              <1> 				     ; *if bit 7 is set (80 to FFh)
   623                              <1> 				     ; *if it is installable device driver
   624                              <1> 				     ; *index (0 to 7Fh)
   625                              <1> 				     ; otherwise it is kernel device index
   626 00018FFC <res 0000001E>      <1> DEV_OPENMODE:	 resb NUMOFDEVICES   ; 1 = read mode
   627                              <1> 				     ; 2 = write mode
   628                              <1> 				     ; 3 = read & write 	  
   629                              <1> 				     ; 0 = not open (free)		
   630 0001901A <res 00000078>      <1> DEV_NAME_PTR:    resd NUMOFDEVICES   ; pointers to name addresses of drivers
   631                              <1> 				     ; Address base: KDEV_NAME+		
   632                              <1> 				     ; or IDEV_NAME+
   633 00019092 <res 00000078>      <1> DEV_R_POINTER:	 resd NUMOFDEVICES   ; reading pointer, writing pointer	
   634 0001910A <res 00000078>      <1> DEV_W_POINTER:	 resd NUMOFDEVICES   ; sector number if block device
   635                              <1> 				     ; character offset if char device
   636 00019182 <res 00000002>      <1> alignb 4
   637                              <1> 
   638                              <1> ; 06/10/2016
   639                              <1> ; Open File Parameters
   640 00019184 <res 00000028>      <1> OF_FCLUSTER:	resd OPENFILES  ; First clusters of open files
   641 000191AC <res 0000000A>      <1> OF_DRIVE:	resb OPENFILES  ; Logical DOS drive numbers of open files 
   642 000191B6 <res 0000000A>      <1> OF_MODE:	resb OPENFILES  ; Open mode (1 = read, 2 = write, 3 = r&w) 
   643 000191C0 <res 0000000A>      <1> OF_STATUS:	resb OPENFILES  ; (bit 0 = read, bit 1 = write)
   644 000191CA <res 0000000A>      <1> OF_OPENCOUNT:	resb OPENFILES  ; Open counts of open files
   645 000191D4 <res 00000028>      <1> OF_POINTER:	resd OPENFILES	; File seek/read/write pointer
   646 000191FC <res 00000028>      <1> OF_SIZE:	resd OPENFILES	; File sizes of open files (in bytes)
   647 00019224 <res 00000028>      <1> OF_DIRFCLUSTER:	resd OPENFILES  ; Directory First Clusters of open files
   648 0001924C <res 00000028>      <1> OF_DIRCLUSTER:	resd OPENFILES  ; Directory (Entry) Clusters of open files
   649 00019274 <res 00000028>      <1> OF_VOLUMEID:	resd OPENFILES  ; Vol ID for removable drives of open files
   650 0001929C <res 00000028>      <1> OF_CCLUSTER:	resd OPENFILES  ; Current clusters of open files
   651 000192C4 <res 00000028>      <1> OF_CCINDEX:	resd OPENFILES  ; Cluster index numbers of current clusters
   652                              <1> ; 24/10/2016
   653 000192EC <res 00000014>      <1> OF_DIRENTRY:	resw OPENFILES  ; Directory entry index no. in dir cluster 
   654                              <1> 				; Sector index = entry index / 16
   655                              <1> ;alignb 2
   656                              <1> 
   657 00019300 <res 00000060>      <1> DTA:		resd 24		; Find First File data transfer area
   658                              <1> 
   659                              <1> ; 19/12/2016
   660 00019360 <res 00000001>      <1> tcallback:	resb 1		; Timer callback method flag for 'systimer'
   661 00019361 <res 00000001>      <1> trtc:		resb 1		; Timer interrupt type flag for 'systimer'
   662                              <1> ; 20/02/2017
   663 00019362 <res 00000001>      <1> no_page_swap:	resb 1		; Swap lock for Signal Response Byte pages 
   664                              <1> ;;15/01/2017
   665                              <1> ; 02/01/2017
   666                              <1> ;;intflg:	resb 1		; software interrupt in progress signal
   667                              <1> 				; (for timer interrupt)
   668                              <1> 
   669 00019363 <res 00000001>      <1> alignb 4
   670                              <1> ; 13/04/2017
   671 00019364 <res 0000001E>      <1> DEV_INTR:	resb NUMOFDEVICES ; Device Interrupt (IRQ) number + 1	
   672                              <1> 				; (0= not available, 1= IRQ 0, 16= IRQ 15)
   673 00019382 <res 00000040>      <1> DEV_INT_HNDLR:	resd 16		; Device Interrupt Handler addr, if > 0 	
   674                              <1> 
   675                              <1> 
   676                              <1> ;alignb 4
   677                              <1> 
   678                              <1> ; 26/02/2017 ; IRQ Callback parameters ('syscalbac')
   679                              <1> ;Index: ; 0 to 8
   680                              <1> ;	0 = IRQ3, 1 = IRQ4, 2 = IRQ5, 3 = IRQ7
   681                              <1> ;	4 = IRQ9, 5 = IRQ10, 6 = IRQ11, 7 = IRQ12, 8 = IRQ13  
   682 000193C2 <res 00000009>      <1> IRQ.owner:	resb 9		; owner, 0 = free, >0 = [u.uno]
   683 000193CB <res 00000009>      <1> IRQ.dev:	resb 9		; 0 = default/kernel, >0 = device number
   684 000193D4 <res 00000009>      <1> IRQ.method:	resb 9 		; 0 = Signal Response Byte, 1 = Callback
   685 000193DD <res 00000009>      <1> IRQ.srb:	resb 9 		; Signal Response/Return Byte value
   686 000193E6 <res 00000024>      <1> IRQ.addr:	resd 9		; Rignal Response Byte address (physical)
   687                              <1> 				; or Callback service address (virtual)
   688                              <1> ; 28/02/2017
   689 0001940A <res 00000004>      <1> IRQ_cr3:	resd 1		; for saving cr3 register in IRQ handler
   690 0001940E <res 00000001>      <1> IRQnum:		resb 1		; IRQ number for IRQ handler (trdosk8.s)
   691                              <1> 
   692                              <1> ; 10/04/2017
   693                              <1> ; 03/04/2017
   694                              <1> ; UNINITIALIZED AUDIO DATA
   695 0001940F <res 00000001>      <1> alignb 4
   696 00019410 <res 00000001>      <1> audio_pci:	resb 1
   697 00019411 <res 00000001>      <1> audio_device:	resb 1
   698 00019412 <res 00000001>      <1> audio_mode:	resb 1
   699 00019413 <res 00000001>      <1> audio_intr:	resb 1
   700 00019414 <res 00000001>      <1> audio_busy:	resb 1  ; Busy flag for audio irq ; 21/04/2017
   701 00019415 <res 00000001>      <1> audio_reserved: resb 1
   702 00019416 <res 00000002>      <1> audio_io_base:	resw 1 	; Base I/O address of audio device
   703 00019418 <res 00000004>      <1> audio_dev_id:	resd 1	; BUS/DEV/FN ; 00000000BBBBBBBBDDDDDFFF00000000
   704 0001941C <res 00000004>      <1> audio_vendor:	resd 1
   705 00019420 <res 00000004>      <1> audio_stats_cmd: resd 1
   706                              <1> ;
   707 00019424 <res 00000004>      <1> audio_buffer:	resd 1	; virtual address of user's audio buffer
   708 00019428 <res 00000004>      <1> audio_p_buffer:	resd 1	; Physical address of user's audio buffer
   709 0001942C <res 00000004>      <1> audio_buff_size: resd 1 ; user's audio buffer size (half buffer size) 
   710 00019430 <res 00000004>      <1> audio_dma_buff: resd 1  ; dma buffer address
   711 00019434 <res 00000004>      <1> audio_dmabuff_size: resd 1 ; dma buffer size (2 * half buffer size)
   712 00019438 <res 00000001>      <1> audio_flag:	resb 1  ; dma buffer flag (1st half = 0, 2nd half = 1)
   713 00019439 <res 00000001>      <1> audio_user:	resb 1	; user number of the owner
   714 0001943A <res 00000001>      <1> audio_cb_mode:	resb 1	; 0 = signal response byte method
   715                              <1> 			; 1 = callback method
   716                              <1> 			; 2 = s.r.b. method with auto increment
   717 0001943B <res 00000001>      <1> audio_srb:	resb 1	; signal response byte value
   718 0001943C <res 00000004>      <1> audio_cb_addr:	resd 1  ; callback service address or s.r.b. address
   719                              <1> 			; (s.r.b. addr is physical, cbs addr is virtual)
   720                              <1> 
   721 00019440 <res 00000001>      <1> audio_bps:	resb 1  ; selected mode: 8 bit, 16 bit
   722 00019441 <res 00000001>      <1> audio_stmo:	resb 1	; selected mode: mono /stereo
   723 00019442 <res 00000002>      <1> audio_freq: 	resw 1	; sampling rate
   724                              <1> 
   725                              <1> ; 21/04/2017
   726 00019444 <res 00000001>      <1> audio_play_cmd: resb 1  ; Play/Stop command (1 = play, 0 = stop)
   727                              <1> audio_civ: ; 28/05/2017 ; Current Buffer Index (AC'97)
   728 00019445 <res 00000001>      <1> audio_flag_eol:	resb 1  ; End of Link status (vt8233, EOL/FLAG)
   729                              <1> 
   730                              <1> audio_master_volume:
   731 00019446 <res 00000001>      <1> audio_master_volume_l: resb 1 ; sound volume (lineout) left channel
   732 00019447 <res 00000001>      <1> audio_master_volume_r: resb 1 ; sound volume (lineout) right channel
   733                              <1> 
   734                              <1> alignb 4
   735                              <1> ; 28/05/2017
   736                              <1> ; AC'97 Audio Controller Base Adress Registers
   737 00019448 <res 00000002>      <1> NAMBAR:		resw 1	; Native Audio Mixer Base Address
   738 0001944A <res 00000002>      <1> NABMBAR:	resw 1	; Native Audio Bus Mastering Base Address
   739                              <1> 	
   740                              <1> ;alignb 4
   741                              <1> ; 21/04/2017
   742 0001944C <res 00000400>      <1> audio_bdl_buff:	resd 32*8  ; VT8233 (AC97) BDL Buffer Size
   743                              <1> ; 12/05/2017
   744 0001984C <res 00000004>      <1> base_addr:	resd 1	; 'direct_memory_access' (memory.s)
   745                              <1> 
   746                              <1> ; 28/08/2017
   747                              <1> ; 20/08/2017
   748 00019850 <res 00000001>      <1> 		resb 1  ;
   749 00019851 <res 00000001>      <1> dma_user:	resb 1	; user number for sysdma
   750 00019852 <res 00000001>      <1> dma_channel:	resb 1	; dma channel for sysdma
   751 00019853 <res 00000001>      <1> dma_mode:	resb 1  ; dma mode for sysdma	
   752 00019854 <res 00000004>      <1> dma_addr:	resd 1	; dma buffer physical addr for sysdma
   753 00019858 <res 00000004>      <1> dma_size:	resd 1  ; dma buffer size (in bytes) for sysdma
   754 0001985C <res 00000004>      <1> dma_start:	resd 1  ; dma start address for sysdma
   755 00019860 <res 00000004>      <1> dma_count:	resd 1  ; dma count (in bytes) for sysdma 
   756                              <1> 
   757 00019864 <res 0000679C>      <1> alignb 65536
   758                              <1> ; 09/08/2017
   759                              <1> ; 12/05/2017
   760 00020000 <res 00010000>      <1> sb16_dma_buffer: resb 65536 ; DMA buffer for sb16 audio playing.
  3636                                  ; 24/01/2016
  3637                                  %include 'ubss.s'	; UNINITIALIZED KERNEL (USER) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - UNINITIALIZED USER DATA : ubss.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 28/02/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    11                              <1> ; ux.s (04/12/2015)
    12                              <1> ; ****************************************************************************
    13                              <1> 
    14                              <1> ; Retro UNIX 386 v1 Kernel - ux.s
    15                              <1> ; Last Modification: 04/12/2015
    16                              <1> ;
    17                              <1> ; ///////// RETRO UNIX 386 V1 SYSTEM DEFINITIONS ///////////////
    18                              <1> ; (Modified from 
    19                              <1> ;	Retro UNIX 8086 v1 system definitions in 'UNIX.ASM', 01/09/2014)
    20                              <1> ; ((UNIX.ASM (RETRO UNIX 8086 V1 Kernel), 11/03/2013 - 01/09/2014))
    21                              <1> ; ----------------------------------------------------------------------------
    22                              <1> ; Derived from UNIX Operating System (v1.0 for PDP-11) 
    23                              <1> ; (Original) Source Code by Ken Thompson (1971-1972)
    24                              <1> ; <Bell Laboratories (17/3/1972)>
    25                              <1> ; <Preliminary Release of UNIX Implementation Document>
    26                              <1> ; (Section E10 (17/3/1972) - ux.s)
    27                              <1> ; ****************************************************************************
    28                              <1> 
    29                              <1> alignb 2
    30                              <1> 
    31                              <1> inode:
    32                              <1> 	; 11/03/2013. 
    33                              <1> 	;Derived from UNIX v1 source code 'inode' structure (ux).
    34                              <1> 	;i.
    35                              <1> 
    36 00030000 <res 00000002>      <1> 	i.flgs:	 resw 1
    37 00030002 <res 00000001>      <1> 	i.nlks:	 resb 1
    38 00030003 <res 00000001>      <1> 	i.uid:	 resb 1
    39                              <1>         ;i.size:  resw 1 ; size
    40 00030004 <res 00000002>      <1> 	resw 1 ; 29/04/2016
    41 00030006 <res 00000010>      <1> 	i.dskp:	 resw 8 ; 16 bytes
    42 00030016 <res 00000004>      <1> 	i.ctim:	 resd 1
    43 0003001A <res 00000004>      <1> 	i.mtim:	 resd 1
    44 0003001E <res 00000002>      <1> 	i.rsvd:  resw 1 ; Reserved (ZERO/Undefined word for UNIX v1.)
    45                              <1> 
    46                              <1> I_SIZE	equ $ - inode 
    47                              <1> 
    48                              <1> process:
    49                              <1> 	; 19/12/2016
    50                              <1> 	; 21/05/2016
    51                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
    52                              <1> 	; 06/05/2015 - Retro UNIX 386 v1
    53                              <1> 	; 11/03/2013 - 05/02/2014 (Retro UNIX 8086 v1)
    54                              <1> 	;Derived from UNIX v1 source code 'proc' structure (ux).
    55                              <1> 	;p.
    56                              <1> 	
    57 00030020 <res 00000020>      <1>         p.pid:   resw nproc
    58 00030040 <res 00000020>      <1>         p.ppid:  resw nproc
    59 00030060 <res 00000020>      <1>         p.break: resw nproc
    60 00030080 <res 00000010>      <1>         p.ttyc:  resb nproc ; console tty in Retro UNIX 8086 v1.
    61 00030090 <res 00000010>      <1> 	p.waitc: resb nproc ; waiting channel in Retro UNIX 8086 v1.
    62 000300A0 <res 00000010>      <1> 	p.link:	 resb nproc
    63 000300B0 <res 00000010>      <1> 	p.stat:	 resb nproc
    64                              <1> 
    65                              <1> 	; 06/05/2015 (Retro UNIX 386 v1 feature only !) 
    66 000300C0 <res 00000040>      <1> 	p.upage: resd nproc ; Physical address of the process's
    67                              <1> 			    ; 'user' structure
    68                              <1> 	; 21/05/2016	
    69                              <1> 	; 19/05/2016 (TRDOS 386 feature only!)
    70 00030100 <res 00000010>      <1> 	p.timer: resb nproc ; number of timer events of the processs
    71                              <1> 
    72                              <1> 	; 19/12/2016
    73 00030110 <res 00000040>      <1> 	p.tcb:	resd nproc ; timer callback service address (if > 0)
    74                              <1> 			  		 			 	  
    75                              <1> P_SIZE	equ $ - process
    76                              <1> 
    77                              <1> ; fsp table (original UNIX v1)
    78                              <1> ;
    79                              <1> ;Entry
    80                              <1> ;          15                                      0
    81                              <1> ;  1     |---|---------------------------------------|
    82                              <1> ;        |r/w|       i-number of open file           |
    83                              <1> ;        |---|---------------------------------------| 
    84                              <1> ;        |               device number               |
    85                              <1> ;        |-------------------------------------------|
    86                              <1> ;    (*) | offset pointer, i.e., r/w pointer to file |
    87                              <1> ;        |-------------------------------------------| 
    88                              <1> ;        |  flag that says    | number of processes  |
    89                              <1> ;        |   file deleted     | that have file open  |
    90                              <1> ;        |-------------------------------------------| 
    91                              <1> ;  2     |                                           |
    92                              <1> ;        |-------------------------------------------| 
    93                              <1> ;        |                                           |
    94                              <1> ;        |-------------------------------------------|
    95                              <1> ;        |                                           |
    96                              <1> ;        |-------------------------------------------|
    97                              <1> ;        |                                           |
    98                              <1> ;        |-------------------------------------------| 
    99                              <1> ;  3     |                                           | 
   100                              <1> ;        |                                           |  
   101                              <1> ;
   102                              <1> ; (*) Retro UNIX 386 v1 modification: 32 bit offset pointer 
   103                              <1> 
   104                              <1> 
   105                              <1> ; 15/04/2015
   106 00030150 <res 000001F4>      <1> fsp:	 resb nfiles * 10 ; 11/05/2015 (8 -> 10)
   107 00030344 <res 00000002>      <1> idev:	 resw 1 ; device number is 1 byte in Retro UNIX 8086 v1 !
   108 00030346 <res 00000002>      <1> cdev:    resw 1 ; device number is 1 byte in Retro UNIX 8086 v1 !
   109                              <1> ; 18/05/2015
   110                              <1> ; 26/04/2013 device/drive parameters (Retro UNIX 8086 v1 feature only!)
   111                              <1> ; 'UNIX' device numbers (as in 'cdev' and 'u.cdrv')
   112                              <1> ;	0 -> root device (which has Retro UNIX 8086 v1 file system)
   113                              <1> ; 	1 -> mounted device (which has Retro UNIX 8086 v1 file system)
   114                              <1> ; 'Retro UNIX 8086 v1' device numbers: (for disk I/O procedures)
   115                              <1> ;	0 -> fd0 (physical drive, floppy disk 1), physical drive number = 0
   116                              <1> ;	1 -> fd1 (physical drive, floppy disk 2), physical drive number = 1
   117                              <1> ;	2 -> hd0 (physical drive, hard disk 1), physical drive number = 80h
   118                              <1> ;	3 -> hd1 (physical drive, hard disk 2), physical drive number = 81h
   119                              <1> ;	4 -> hd2 (physical drive, hard disk 3), physical drive number = 82h
   120                              <1> ;	5 -> hd3 (physical drive, hard disk 4), physical drive number = 83h
   121 00030348 <res 00000001>      <1> rdev:	 resb 1 ; root device number ; Retro UNIX 8086 v1 feature only!
   122                              <1> 	        ; as above, for physical drives numbers in following table
   123 00030349 <res 00000001>      <1> mdev:	 resb 1 ; mounted device number ; Retro UNIX 8086 v1 feature only!
   124                              <1> ; 15/04/2015
   125 0003034A <res 00000001>      <1> active:	 resb 1 
   126 0003034B <res 00000001>      <1> 	 resb 1 ; 09/06/2015
   127 0003034C <res 00000002>      <1> mnti:	 resw 1
   128 0003034E <res 00000002>      <1> mpid:	 resw 1
   129 00030350 <res 00000002>      <1> rootdir: resw 1
   130                              <1> 
   131                              <1> ; 21/05/2016 - TRDOS 386 (TRDOS v2.0) - priority levels, 3 run queues 
   132                              <1> runq:
   133 00030352 <res 00000002>      <1> runq_event:	 resw 1 ; high priority, 'run for event'            ; 2
   134 00030354 <res 00000002>      <1> runq_normal:	 resw 1 ; normal/regular priority, 'run as reqular' ; 1
   135 00030356 <res 00000002>      <1> runq_background: resw 1 ; low priority, 'run on background'         ; 0
   136                              <1> ;
   137 00030358 <res 00000001>      <1> imod:	 resb 1
   138 00030359 <res 00000001>      <1> smod:	 resb 1
   139 0003035A <res 00000001>      <1> mmod:	 resb 1
   140 0003035B <res 00000001>      <1> sysflg:	 resb 1
   141                              <1> 
   142                              <1> alignb 4
   143                              <1> 
   144                              <1> user:
   145                              <1> 	; 13/01/2017
   146                              <1> 	; 19/12/2016
   147                              <1> 	; 21/05/2016 - TRDOS 386 (TRDOS v2.0) 
   148                              <1> 	; 	       [u.pri] usage method modification
   149                              <1> 	; 04/12/2015 
   150                              <1> 	; 18/10/2015
   151                              <1> 	; 12/10/2015
   152                              <1> 	; 21/09/2015
   153                              <1> 	; 24/07/2015
   154                              <1> 	; 16/06/2015
   155                              <1> 	; 09/06/2015
   156                              <1> 	; 11/05/2015
   157                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - 32 bit modifications)
   158                              <1> 	; 10/10/2013
   159                              <1> 	; 11/03/2013. 
   160                              <1> 	;Derived from UNIX v1 source code 'user' structure (ux).
   161                              <1> 	;u.
   162                              <1> 
   163 0003035C <res 00000004>      <1> 	u.sp:	  resd 1 ; esp (kernel stack at the beginning of 'sysent')
   164 00030360 <res 00000004>      <1> 	u.usp:	  resd 1 ; esp (kernel stack points to user's registers)
   165 00030364 <res 00000004>      <1> 	u.r0:	  resd 1 ; eax
   166 00030368 <res 00000002>      <1> 	u.cdir:	  resw 1
   167 0003036A <res 0000000A>      <1> 	u.fp:	  resb 10
   168 00030374 <res 00000004>      <1> 	u.fofp:	  resd 1
   169 00030378 <res 00000004>      <1> 	u.dirp:	  resd 1
   170 0003037C <res 00000004>      <1> 	u.namep:  resd 1
   171 00030380 <res 00000004>      <1> 	u.off:	  resd 1
   172 00030384 <res 00000004>      <1> 	u.base:	  resd 1
   173 00030388 <res 00000004>      <1> 	u.count:  resd 1
   174 0003038C <res 00000004>      <1> 	u.nread:  resd 1
   175 00030390 <res 00000004>      <1> 	u.break:  resd 1 ; break
   176 00030394 <res 00000002>      <1> 	u.ttyp:	  resw 1 
   177                              <1> 	; 10/01/2017 (TRDOS 386, relocation and dword alignment)
   178                              <1> 	; tty number (rtty, rcvt, wtty)
   179 00030396 <res 00000001>      <1> 	u.ttyn:	  resb 1 ; 28/07/2013 - Retro Unix 8086 v1 feature only !
   180 00030397 <res 00000001>      <1> 	u.resb:   resb 1 ; 10/01/2017 (TRDOS 386, temporary)
   181 00030398 <res 00000010>      <1> 	u.dirbuf: resb 16 ; 04/12/2015 (10 -> 16) 
   182                              <1> 	;u.pri:	  resw 1 ; 14/02/2014
   183 000303A8 <res 00000001>      <1> 	u.quant:  resb 1 ; Retro UNIX 8086 v1 Feature only ! (uquant)
   184 000303A9 <res 00000001>      <1> 	u.pri:	  resb 1 ; Modification: 21/05/2016 (priority levels: 0, 1, 2)
   185 000303AA <res 00000002>      <1> 	u.intr:	  resw 1
   186 000303AC <res 00000002>      <1> 	u.quit:	  resw 1
   187                              <1> 	;u.emt:	  resw 1 ; 10/10/2013
   188                              <1> 	;u.ilgins: resw 1 ; 10/01/2017
   189 000303AE <res 00000002>      <1> 	u.cdrv:	  resw 1 ; cdev
   190 000303B0 <res 00000001>      <1> 	u.uid:	  resb 1 ; uid
   191 000303B1 <res 00000001>      <1> 	u.ruid:	  resb 1
   192 000303B2 <res 00000001>      <1> 	u.bsys:	  resb 1
   193 000303B3 <res 00000001>      <1> 	u.uno:	  resb 1
   194 000303B4 <res 00000004>      <1>         u.upage:  resd 1 ; 16/04/2015 - Retro Unix 386 v1 feature only !
   195 000303B8 <res 00000004>      <1> 	u.pgdir:  resd 1 ; 09/03/2015 (page dir addr of process)
   196 000303BC <res 00000004>      <1> 	u.ppgdir: resd 1 ; 06/05/2015 (page dir addr of the parent process)
   197 000303C0 <res 00000004>      <1> 	u.pbase:  resd 1 ; 20/05/2015 (physical base/transfer address)
   198 000303C4 <res 00000002>      <1> 	u.pcount: resw 1 ; 20/05/2015 (byte -transfer- count for page)
   199                              <1> 	;u.pncount: resw 1 
   200                              <1> 		; 16/06/2015 (byte -transfer- count for page, 'namei', 'mkdir')
   201                              <1> 	;u.pnbase:  resd 1 
   202                              <1> 		; 16/06/2015 (physical base/transfer address, 'namei', 'mkdir')
   203                              <1> 			 ; 09/06/2015
   204 000303C6 <res 00000001>      <1> 	u.kcall:  resb 1 ; The caller is 'namei' (dskr) or 'mkdir' (dskw) sign		
   205 000303C7 <res 00000001>      <1> 	u.brwdev: resb 1 ; Block device number for direct I/O (bread & bwrite)
   206                              <1> 			 ; 24/07/2015 - 24/06/2015
   207                              <1> 	;u.args:  resd 1 ; arguments list (line) offset from start of [u.upage]
   208                              <1> 			 ; (arg list/line is from offset [u.args] to 4096 in [u.upage])
   209                              <1> 			 ; ([u.args] points to argument count -argc- address offset)
   210                              <1>  			 ; 24/06/2015	  	
   211                              <1> 	;u.core:  resd 1 ; physical start address of user's memory space (for sys exec)
   212                              <1> 	;u.ecore: resd 1 ; physical end address of user's memory space (for sys exec)
   213                              <1> 	; last error number
   214 000303C8 <res 00000004>      <1> 	u.error:  resd 1 ; 28/07/2013 - 09/03/2015 
   215                              <1> 		        ; Retro UNIX 8086/386 v1 feature only!
   216                              <1> 			; 21/09/2015 (debugging - page fault analyze)
   217 000303CC <res 00000004>      <1> 	u.pfcount: resd 1 ; page fault count for (this) process (for sys geterr)
   218                              <1> 		; 19/12/2016 (TRDOS 386)	
   219 000303D0 <res 00000004>      <1> 	u.tcb:	  resd 1 ; Timer callback address/flag which will be used by timer int
   220                              <1> 		; 13/01/2017 (TRDOS 386)
   221 000303D4 <res 00000001>      <1> 	u.t_lock: resb 1 ; Timer interrupt (callback) lock (unlocked by 'sysrele')
   222 000303D5 <res 00000001>      <1> 	u.t_mode: resb 1 ; running mode during timer interrupt (0= system, 0FFh= user)
   223                              <1> 		; 26/02/2017 (TRDOS 386)
   224 000303D6 <res 00000001>      <1> 	u.irqc:	  resb 1  ; Count of IRQ callback services (IRQs in use)
   225                              <1> 		; 28/02/2017 (TRDOS 386) 
   226 000303D7 <res 00000001>      <1> 	u.irqwait: resb 1 ; IRQ waiting for callback service flag (IRQ number, If > 0)
   227 000303D8 <res 00000001>      <1> 	u.r_lock:  resb 1 ; 'IRQ callback service is in progress' flag (IRQ lock)
   228 000303D9 <res 00000001>      <1> 	u.r_mode:  resb 1 ; running mode during hadware interrupt	
   229                              <1> 		; 27/02/2017 (TRDOS 386) 
   230 000303DA <res 00000001>      <1> 	u.fpsave: resb 1  ; TRDOS 386, 'save/restore FPU registers' flag
   231 000303DB <res 00000001>      <1> alignb 4
   232 000303DC <res 0000005E>      <1> 	u.fpregs: resb 94 ; 94 byte area for saving and restoring FPU registers	
   233                              <1> 
   234 0003043A <res 00000002>      <1> alignb 4
   235                              <1> 
   236                              <1> U_SIZE	equ $ - user
   237                              <1> 
   238                              <1> ; 18/10/2015 - Retro UNIX 386 v1 (local variables for 'namei' and 'sysexec')
   239 0003043C <res 00000004>      <1> pcore:  resd 1  ; physical start address of user's memory space (for sys exec)
   240 00030440 <res 00000004>      <1> ecore:  resd 1  ; physical address of user's stack/last page (for sys exec)
   241 00030444 <res 00000004>      <1> nbase:	resd 1	; physical base address for 'namei' & 'sysexec'
   242 00030448 <res 00000002>      <1> ncount: resw 1	; remain byte count in page for 'namei' & 'sysexec'
   243 0003044A <res 00000002>      <1> argc:	resw 1	; argument count for 'sysexec'
   244 0003044C <res 00000004>      <1> argv:	resd 1	; argument list (recent) address for 'sysexec'
   245                              <1> 
   246                              <1> ; 03/06/2015 - Retro UNIX 386 v1 Beginning
   247                              <1> ; 07/04/2013 - 31/07/2013 - Retro UNIX 8086 v1
   248 00030450 <res 00000001>      <1> rw: 	 resb 1 ;; Read/Write sign (iget)
   249                              <1> 
   250                              <1> ;alignb 4
   251                              <1> 
   252                              <1> ; 24/04/2016
   253 00030451 <res 00000004>      <1> ii:		resd 1 ; first cluster of the program file
   254 00030455 <res 00000004>      <1> i.size:		resd 1 ; size of the program file
  3638                                  
  3639 00030459 <res 00000003>          alignb 4
  3640                                  
  3641                                  ; 23/05/2016 (TRDOS 386)
  3642                                  ; 14/10/2015 (Retro UNIX 386 v1, 'unix386.s')
  3643 0003045C <res 00000004>          cr3reg:	 resd 1  ; cr3 register content at the beginning of the timer
  3644                                  		 ; (or RTC) interrupt handler.
  3645                                  
  3646                                  ; 10/12/2016 (callback)
  3647                                  ; 10/06/2016
  3648                                  ; 19/05/2016
  3649                                  ; 18/05/2016 - TRDOS 386 feature only !
  3650 00030460 <res 00000100>          timer_set: resd 16*4   ; 256 bytes memory space for 16 timer events
  3651                                  	; Timer Event Structure: (max. 16 timer events, 16*16 bytes)
  3652                                  	;       Owner:	        resb 1 ; 0 = free
  3653                                  	;		  	       ;>0 = process number (u.uno)
  3654                                  	;	Callback:	resb 1 ; 0 = response byte address (phy)
  3655                                  	;				 1 = callback address (virtual)				
  3656                                  	;	Interrupt:      resb 1 ; 0 = Timer interrupt (or none)
  3657                                  	;		   	       ; 1 = Real Time Clock interrupt 
  3658                                  	;	Response:       resb 1 ; 0 to 255, signal return value
  3659                                  	;	Count Limit:	resd 1 ; count of ticks (total/set)
  3660                                  	;	Current Count: 	resd 1 ; count of ticks (current)
  3661                                  	;	Response Addr:  resd 1 ; response byte (pointer) address
  3662                                  	;			       ; (or callback -user service- address)	
  3663                                  
  3664                                  ;; Memory (swap) Data (11/03/2015)
  3665                                  ; 09/03/2015
  3666 00030560 <res 00000002>          swpq_count: resw 1 ; count of pages on the swap queue
  3667 00030562 <res 00000004>          swp_drv:    resd 1 ; logical drive description table address of the swap drive/disk
  3668 00030566 <res 00000004>          swpd_size:  resd 1 ; size of swap drive/disk (volume) in sectors (512 bytes). 		  				
  3669 0003056A <res 00000004>          swpd_free:  resd 1 ; free page blocks (4096 bytes) on swap disk/drive (logical)
  3670 0003056E <res 00000004>          swpd_next:  resd 1 ; next free page block
  3671 00030572 <res 00000004>          swpd_last:  resd 1 ; last swap page block	
  3672                                  
  3673 00030576 <res 00000002>          alignb 4
  3674                                  
  3675                                  ; 10/07/2015
  3676                                  ; 28/08/2014
  3677 00030578 <res 00000004>          error_code:	resd 1
  3678                                  ; 29/08/2014
  3679 0003057C <res 00000004>          FaultOffset: 	resd 1
  3680                                  ; 21/09/2015
  3681 00030580 <res 00000004>          PF_Count:	resd 1	; total page fault count
  3682                                  		       	; (for debugging - page fault analyze)
  3683                                  		 	; 'page_fault_handler' (memory.inc)
  3684                                  			; 'sysgeterr' (u9.s)
  3685                                  
  3686                                  ; 29/04/2016 (TRDOS 386 = TRDOS v2.0)
  3687                                  ; 22/08/2015 (Retro UNIX 386 v1)
  3688                                  buffer: 
  3689 00030584 <res 00000008>          	resb	8 
  3690                                  readi_buffer:
  3691 0003058C <res 00000200>          	resb 	512
  3692 0003078C <res 00000008>          	resb	8
  3693                                  writei_buffer:
  3694 00030794 <res 00000200>          	resb	512	
  3695                                  ; 24/10/2016
  3696 00030994 <res 00000008>          	resb	8 
  3697                                  rw_buffer:
  3698 0003099C <res 00000800>          	resb 	2048  ; general purposed, r/w sector buffer
  3699                                  
  3700                                  %if 1
  3701                                  ; 17/01/2021
  3702 0003119C <res 00000080>          edid_info:	resb 128 ; VESA EDID (monitor capabilities) info	
  3703                                  ; 28/11/2020
  3704 0003121C <res 00000001>          pmi32:		resb 1	; (>0) use VESA VBE3 protected mode calls 
  3705 0003121D <res 00000001>          vbe_mode_x:	resb 1  ; VESA VBE3 video bios mode set options
  3706 0003121E <res 00000002>          video_mode:	resw 1	; VESA VBE3 video mode (with option flags)
  3707                                  ; 30/11/2020
  3708 00031220 <res 00000004>          vbe3bios_addr:	resd 1	; new (writable mem) address of VBE3 bios
  3709                                  ; 02/12/2020
  3710 00031224 <res 00000004>          pmid_addr:	resd 1	; PMInfoBlock ('PMID') linear address
  3711                                  ; 14/01/2021
  3712                                  ; 06/12/2020		; VESA VBE 3 video state
  3713                                  ;vbe3stbufsize: resw 1	; video regs/dac/bios state buffer size
  3714                                  ;			; block size in bytes
  3715                                  ; 16/01/2021
  3716 00031228 <res 00000002>          vbe3stbsflags: resw 1	; video regs/dac/bios state buffer size
  3717                                  ;			; pointer flags for buffer state options
  3718                                  %endif
  3719                                  
  3720                                  %if 1
  3721                                  ; 10/12/2020
  3722                                  LFB_Info:
  3723 0003122A <res 00000010>          		resb 16	; Linear Frame Buffer info block
  3724                                  
  3725                                  ;24/11/2020 - TRDOS 386 v2.0.3
  3726                                  ; BOCHS/PLEX86 VESA VBE3 MODE INFO extension to TRDOS 386 v2 kernel	
  3727                                  MODE_INFO_LIST:
  3728 0003123A <res 00000044>          		resb 68	; mode + 66 byte VESA vbe3 mode info (4F01h) 
  3729                                  %endif
  3730                                  
  3731                                  ; 01/01/2021
  3732 0003127E <res 00000004>          maskcolor:	resd 1	; VGA/SVGA pixel mask color ('sysvideo') 
  3733                                  ; 05/01/2021
  3734 00031282 <res 00000001>          ufont:		resb 1	; (VGA graphics) user font flags
  3735                                  			; bit 7 - permission flag for int 31h
  3736                                  			; bit 4 - 8x16 user font ready/loaded flag  
  3737                                  			; bit 3 - 8x8 user font ready/loaded flag
  3738                                  			; bit 1 - select 8x16 user font (sysvideo)
  3739                                  			; bit 0 - select 8x8 user font (sysvideo)
  3740 00031283 <res 00000001>          		resb 1	; 19/01/2021
  3741                                  ; 17/01/2021
  3742 00031284 <res 00000001>          srvsf:		resb 1	; 'save restore video state' permission flag
  3743                                  ; 18/01/2021
  3744 00031285 <res 00000001>          srvso:		resb 1	; video state buffer save/restore option
  3745 00031286 <res 00000004>          VideoStateID:	resd 1	; used to verify state saved by same prog
  3746                                  
  3747                                  bss_end:
  3748                                  
  3749                                  ; 27/12/2013
  3750                                  _end:  ; end of kernel code
